diff --git a/build-tools/build-iso b/build-tools/build-iso
index d6c6ccc6..a830cae2 100755
--- a/build-tools/build-iso
+++ b/build-tools/build-iso
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 #
-# Copyright (c) 2018-2019 Wind River Systems, Inc.
+# Copyright (c) 2018-2020 Wind River Systems, Inc.
 #
 # SPDX-License-Identifier: Apache-2.0
 #
@@ -18,6 +18,10 @@ BUILD_ISO_DIR="$(dirname "$(readlink -f "${BASH_SOURCE[0]}" )" )"
 source "${BUILD_ISO_DIR}/image-utils.sh"
 source "${BUILD_ISO_DIR}/git-utils.sh"
 
+# Set REPOQUERY, REPOQUERY_SUB_COMMAND, REPOQUERY_RESOLVE and
+# REPOQUERY_WHATPROVIDES_DELIM for our build environment.
+source "${BUILD_ISO_DIR}/pkg-manager-utils.sh"
+
 usage () {
     echo ""
     echo "Usage: "
@@ -40,8 +44,8 @@ usage () {
 MY_YUM_CONF=""
 STD_REPO_ID="local-std"
 RT_REPO_ID="local-rt"
-LOWER_LAYER_STD_REPO_ID="StxCentos7Distro"
-LOWER_LAYER_RT_REPO_ID="StxCentos7Distro-rt"
+LOWER_LAYER_STD_REPO_ID=""
+LOWER_LAYER_RT_REPO_ID=""
 
 NPROCS=$(nproc)
 
@@ -77,13 +81,13 @@ function install_pkg_list {
 
    \cd $OUTPUT_DIST_DIR/isolinux/Packages
    $INTERNAL_REPO_ROOT/build-tools/build_iso/cgts_deps.sh --deps=$PKGLIST
-   
+
    if [ $? -ne 0 ]
    then
       echo "Could not install dependencies"
       exit 1
    fi
-   
+ 
    # clean up
    echo "Removing local-std yum repo  $CGCS_REPO_DIR/repodata"
    echo "Removing local-rt yum repo   $CGCS_RT_REPO_DIR/repodata"
@@ -111,7 +115,7 @@ function make_report {
    for PKGLIST in $PKGLISTFILES; do
       while read PKG; do
          PKG=`echo $PKG | sed "s/#.*//"`;
-         if [ "${PKG}x" != "x" ]; then 
+         if [ "${PKG}x" != "x" ]; then
             echo $PKG  >> $REPORT_FILE
          fi
       done < $PKGLIST
@@ -127,7 +131,7 @@ function make_report {
    echo "-----------------" >> $REPORT_FILE
    echo " WARNINGS        " >> $REPORT_FILE
    echo "-----------------" >> $REPORT_FILE
-   
+ 
    # Note that the warnings file may have multiple lines for the same
    # missing dependency.  A sort | uniq solves this so we don't duplicate
    # warnings
@@ -158,13 +162,17 @@ function init_vars {
       exit 1
    fi
 
+   # LOWER_LAYER_STD_REPO_ID should be something like StxCentos7Distro or StxCentos8Distro
+   LOWER_LAYER_STD_REPO_ID=$(grep '\[StxCentos.*Distro\]' ${MY_YUM_CONF} | sed -e 's/^\[//' -e 's/\].*//')
+   LOWER_LAYER_RT_REPO_ID=$(grep '\[StxCentos.*Distro-rt\]' ${MY_YUM_CONF} | sed -e 's/^\[//' -e 's/\].*//')
+
    DISTRO_REPO_DIR=$(for d in $(grep baseurl $MY_YUM_CONF | grep file: | awk -F : '{print $2}' | sed 's:///:/:g'); do if [ -d $d/images ]; then echo $d ;fi; done)
 
    #####################################
    # Output definitons
 
    # where to put stuff (curent dir unless MY_WORKSPACE defined)
-   OUTPUT_DIR="$PWD/export"   
+   OUTPUT_DIR="$PWD/export" 
    if [ ! -z "$MY_WORKSPACE" ] && [ -d "$MY_WORKSPACE" ] ; then
        OUTPUT_DIR="$MY_WORKSPACE/export"
        CGCS_REPO_DIR="$MY_WORKSPACE/std/rpmbuild/RPMS"
@@ -316,7 +324,7 @@ function init_output_dir {
    date +%s.%N > $OUTPUT_DIST_DIR/isolinux/.discinfo
    echo $PLATFORM_RELEASE >> $OUTPUT_DIST_DIR/isolinux/.discinfo
    echo "x86_64" >> $OUTPUT_DIST_DIR/isolinux/.discinfo
-   
+ 
    \cp -L -ru $DISTRO_REPO_DIR/isolinux/* $OUTPUT_DIST_DIR/isolinux/
    \cp -L -ru $DISTRO_REPO_DIR/images/pxeboot $OUTPUT_DIST_DIR/isolinux/images/
 
@@ -342,7 +350,7 @@ function init_output_dir {
        perl -p -i -e "s/device=sda/device=${DEVICE}/g"  $OUTPUT_DIST_DIR/isolinux/isolinux.cfg
    fi
 
-   # Copy UEFI files 
+   # Copy UEFI files
    \cp -L -ru $DISTRO_REPO_DIR/EFI/* $OUTPUT_DIST_DIR/isolinux/EFI/
    \cp -L "$BSP_FILES_PATH/grub.cfg" "$OUTPUT_DIST_DIR/isolinux/EFI/BOOT/grub.cfg"
    \cp -L "$BSP_FILES_PATH/pxeboot_grub.cfg" "$OUTPUT_DIST_DIR/isolinux/pxeboot/pxeboot_grub.cfg"
@@ -472,7 +480,7 @@ function final_touches {
    # create the repo
    \cd $OUTPUT_DIST_DIR/isolinux
    $CREATEREPO -q -g ../comps.xml .
-   
+ 
    # build the ISO
    printf "Building image $OUTPUT_FILE\n"
    \cd $OUTPUT_DIST_DIR
@@ -485,7 +493,7 @@ function final_touches {
       -eltorito-alt-boot \
       -e images/efiboot.img \
             -no-emul-boot \
-      isolinux/   
+      isolinux/ 
 
    isohybrid --uefi $OUTPUT_FILE
    implantisomd5 $OUTPUT_FILE
@@ -495,7 +503,7 @@ function final_touches {
 
 function extract_pkg_from_local_repo {
    local pkgname=$1
-   local yum_conf=$2
+   local pkg_mgr_conf=$2
    shift 2
 
    local repoid=""
@@ -505,7 +513,14 @@ function extract_pkg_from_local_repo {
       repoid_arg+=" --repoid=${repoid}"
    done
 
-   local pkgfile=$(TMPDIR=$TMP_DIR repoquery --config=${yum_conf} ${repoid_arg} --location -q ${pkgname})
+   echo "TMPDIR=$TMP_DIR"\
+        "${REPOQUERY} --config=${pkg_mgr_conf} ${repoid_arg}"\
+        "${REPOQUERY_SUB_COMMAND} --location"\
+        "--arch=noarch,x86_64 -q ${pkgname}"
+   local pkgfile=$(TMPDIR=$TMP_DIR \
+                 ${REPOQUERY} --config=${pkg_mgr_conf} ${repoid_arg} \
+                 ${REPOQUERY_SUB_COMMAND} --location \
+                 --arch=noarch,x86_64 -q ${pkgname})
    if [ -z "${pkgfile}" ]; then
       echo "Could not find package $pkgname in $@"
       exit 1
@@ -605,7 +620,7 @@ EOM
       echo "Error: Could not copy all files from installer"
       exit 1
    fi
-   
+ 
    \cp --preserve=all www/pages/feed/rel-*/LiveOS/squashfs.img $OUTPUT_DIST_DIR/isolinux/LiveOS
    if [ $? -ne 0 ]; then
       echo "Error: Could not copy squashfs from LiveOS"
diff --git a/build-tools/build-pkgs b/build-tools/build-pkgs
index edd980f8..da9d65d0 100755
--- a/build-tools/build-pkgs
+++ b/build-tools/build-pkgs
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 #
-# Copyright (c) 2018 Wind River Systems, Inc.
+# Copyright (c) 2018-2020 Wind River Systems, Inc.
 #
 # SPDX-License-Identifier: Apache-2.0
 #
@@ -15,6 +15,10 @@
 
 BUILD_PKGS_DIR="$(dirname "$(readlink -f "${BASH_SOURCE[0]}" )" )"
 
+# Set REPOQUERY and REPOQUERY_SUB_COMMAND for our build environment.
+source "${BUILD_PKGS_DIR}/pkg-manager-utils.sh"
+
+
 usage () {
     echo ""
     echo "Usage: "
@@ -75,11 +79,15 @@ make_cache_current_rpms () {
             if  [ -d $MY_WORKSPACE/$build_type/rpmbuild/$rpm_type/repodata ]; then
                 current=$MY_WORKSPACE/$build_type/rpmbuild/$rpm_type/
 
-                repoquery \
+                ${REPOQUERY} \
                     --repofrompath=$build_type-$rpm_type,$current \
-                    --repoid=$build_type-$rpm_type --arch=noarch,src,x86_64 -a \
+                    --repoid=$build_type-$rpm_type --arch=noarch,src,x86_64 \
+                    ${REPOQUERY_SUB_COMMAND} \
+                    --all \
                     --qf "%-10{repoid} %-40{name} %-10{version} %-10{release}" \
                     >> ${FILE}
+
+                \rm -rf $TMP_DIR/yum-$USER-*
             fi
         done;
     done;
diff --git a/build-tools/build-rpms-parallel b/build-tools/build-rpms-parallel
index 4ca2202e..e2830c24 100755
--- a/build-tools/build-rpms-parallel
+++ b/build-tools/build-rpms-parallel
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 #
-# Copyright (c) 2018 Wind River Systems, Inc.
+# Copyright (c) 2018-2020 Wind River Systems, Inc.
 #
 # SPDX-License-Identifier: Apache-2.0
 #
@@ -15,7 +15,7 @@
 # The location of packages to be built is
 # $MY_WORKSPACE/<build-type>/rpmbuild/SRPMS.
 #
-# The build order is a derived from the BuildRequires in the 
+# The build order is a derived from the BuildRequires in the
 # spec files in the src.rpms.  Note that the BuildRequires sometimes
 # create dependency loops, so no correct order can be computed.  In these
 # cases we add a retry loop.  As long as one new package builds, we
@@ -24,9 +24,12 @@
 # messages go by!
 #
 
-
 export ME=$(basename "$0")
 CMDLINE="$ME $@"
+BUILD_RPMS_PARALLEL_DIR="$(dirname "$(readlink -f "${BASH_SOURCE[0]}" )" )"
+
+# Set PKG_MANAGER for our build environment.
+source "${BUILD_RPMS_PARALLEL_DIR}/pkg-manager-utils.sh"
 
 
 # Build for distribution.  Currently 'centos' is only supported value.
@@ -43,22 +46,22 @@ MAX_MEM_PER_WORKER=11
 #  Note: tmpfs is typically 2.5 gb when compiling many small jobs
 MIN_MEM_PER_WORKER=3
 
-# Maximum number of disk based parallel build environments 
+# Maximum number of disk based parallel build environments
 MAX_DISK_BASED_WORKERS=2
 
 # Minimum space in gb for each disk based parallel build environment
 MIN_DISK_PER_WORKER=20
 
-# How many srpms to build before we add another parallel build environment 
+# How many srpms to build before we add another parallel build environment
 MIN_TASKS_PER_CORE=3
 
 # Max number of new concurrent builds to allow for
 MAX_SHARE_FACTOR=4
 
-# Always leave at least MEMORY_RESERVE gb of available mem for the system 
+# Always leave at least MEMORY_RESERVE gb of available mem for the system
 MEMORY_RESERVE=1
 
-# These two values will be reassigned in the 'compute_resources' subroutine 
+# These two values will be reassigned in the 'compute_resources' subroutine
 MOCKCHAIN_RESOURCE_ALLOCATION=""
 MAX_WORKERS=$ABSOLUTE_MAX_WORKERS
 
@@ -164,7 +167,7 @@ create-no-clean-list () {
        local install_groups=""
        local install_packages=""
        local p
-    
+
        for p in $(grep "config_opts\['chroot_setup_cmd'\]" $MY_BUILD_CFG | tail -n1 | cut -d '=' -f 2 | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' -e "s/^'//" -e "s/'$//" -e 's/^install //'); do
           if [[ $p == @* ]] ; then
               install_groups=$(join_by ' ' $install_groups $(echo $p | cut -c 2-))
@@ -172,37 +175,44 @@ create-no-clean-list () {
               install_packages=$(join_by ' ' $install_packages $p)
           fi
        done
-    
+
        local noclean_last_list_len=0
        local noclean_list=""
        local tmp_list=""
        local g
-    
+
        for g in $install_groups; do
-           tmp_list=$(yum -c $MY_YUM_CONF groupinfo $g 2>> /dev/null | awk 'f;/Mandatory Packages:/{f=1}' | cut -c 5-)
+           # Find mandatory packages in the group.
+           # Discard anything before (and including) 'Mandatory Packages:'
+           # and anything after (and including) 'Optional Packages:'.
+           # Also discard leading spaces or '+' characters.
+           tmp_list=$(${PKG_MANAGER} -c $MY_YUM_CONF groupinfo $g 2>> /dev/null \
+                        | awk 'f;/Mandatory Packages:/{f=1}' \
+                        | sed -n '/Optional Packages:/q;p' \
+                        | sed 's#[ +]*##')
            noclean_list=$(join_by ' ' $noclean_list $tmp_list)
        done
-    
+
        noclean_list=$(join_by ' ' $noclean_list $install_packages)
        noclean_list=$(echo $noclean_list | tr ' ' '\n' | sort --uniq)
        noclean_list_len=$(echo $noclean_list | wc -w)
-    
+
        while [ $noclean_list_len -gt $noclean_last_list_len ]; do
            noclean_last_list_len=$noclean_list_len
-           noclean_list=$( (yum -c $MY_YUM_CONF deplist $noclean_list 2>> /dev/null | grep provider: | awk '{ print $2 }' | awk -F . '{ print $1 }'; for p in $noclean_list; do echo $p; done) | sort --uniq)
+           noclean_list=$( (${PKG_MANAGER} -c $MY_YUM_CONF deplist $noclean_list 2>> /dev/null | grep provider: | awk '{ print $2 }' | awk -F . '{ print $1 }'; for p in $noclean_list; do echo $p; done) | sort --uniq)
            noclean_list_len=$(echo $noclean_list | wc -w)
        done
-   
+
        echo $noclean_list > $NO_CLEAN_LIST_FILE
    fi
 
    cat $NO_CLEAN_LIST_FILE
 }
 
-str_lst_contains() { 
+str_lst_contains() {
    TARGET="$1"
    LST="$2"
-   if [[ $LST =~ (^|[[:space:]])$TARGET($|[[:space:]]) ]] ; then 
+   if [[ $LST =~ (^|[[:space:]])$TARGET($|[[:space:]]) ]] ; then
       return 0
    else
       return 1
@@ -214,7 +224,7 @@ compute_resources () {
     local b
 
     echo ""
-    for f in $@; do 
+    for f in $@; do
         b=$(basename $f)
         if [ -f $SOURCES_DIR/$b/BIG ] || [ ]; then
             weight=$((weight+MIN_TASKS_PER_CORE))
@@ -232,7 +242,7 @@ compute_resources () {
     local cpus=$(number_of_cpus)
     local num_users=$(sqrt $users)
     local num_build=$(number_of_builds_in_progress)
-    num_build=$((num_build+1))    
+    num_build=$((num_build+1))
     echo "compute_resources: total: cpus=$cpus, mem=$mem, disk=$disk, weight=$weight, num_build=$num_build"
 
     # What fraction of the machine will we use
@@ -311,7 +321,9 @@ create_lst () {
 recreate_repodata () {
    local DIR=${1}
 
-       (cd $DIR
+       (
+        mkdir -p $DIR
+        cd $DIR
         if [ -f repodata/*comps*xml ]; then
            \mv repodata/*comps*xml comps.xml
         fi
@@ -402,11 +414,11 @@ union () {
          echo $b
       fi
    done
-} 
+}
 
 #
 # returns 0 if element is in the array
-# 
+#
 #  e.g.  contains ARRAY $SEEKING  && echo "$SEEKING is in 'ARRAY'"
 #
 contains () {
@@ -453,7 +465,7 @@ build_order_recursive () {
          needs=( $(grep "^$target;" "$SRPM_DIRECT_REQUIRES_FILE" | sed "s/$target;//" | sed 's/,/ /g') )
          needs_list=( $(intersection needs remainder_list) )
          for((idx=0;idx<${#needs_list[@]};idx++)); do
-             build_order_recursive ${needs_list[idx]} 
+             build_order_recursive ${needs_list[idx]}
          done
          echo $target
          break
@@ -503,7 +515,7 @@ build_order () {
       UNORDERED_LIST=( ${original_list[@]} )
       while [ ${#UNORDERED_LIST[@]} -gt 0 ]; do
          element=${UNORDERED_LIST[0]}
-         build_order_recursive $element 
+         build_order_recursive $element
       done
    fi
 }
@@ -621,7 +633,7 @@ umount_mock_root_as_tmpfs () {
       return 0
    fi
    mock_tmpfs_umount $mount_dir &> /dev/null
-   
+
    rc=$?
    if [ $rc -ne 0 ]; then
       echo "FAILED: mock_tmpfs_umount $mount_dir"
@@ -652,7 +664,7 @@ kill_descendents ()
         recursive_promote_children=""
         recursive_children=$(pgrep -P $kill_pid)
     fi
-    
+
     if [ $iteration -eq 0 ]; then
         other_children=$(for relevant_child in $relevant_other_children; do pgrep -P $kill_pid $relevant_child; done)
         if [ "$other_children" != "" ]; then
@@ -667,7 +679,7 @@ kill_descendents ()
     fi
 
     for pid in $recursive_children; do
-        kill_descendents "$pid" $kill_all $need_stop $((iteration + 1)) 
+        kill_descendents "$pid" $kill_all $need_stop $((iteration + 1))
     done
     for pid in $recursive_promote_children; do
         kill_descendents "$pid" 1 1 $((iteration + 1))
@@ -946,11 +958,11 @@ mock_clean_cfg () {
       echo "=================================="
       mock_clean_cache_cfg $CFG
       echo "=================================="
-      echo "$MOCK -r $CFG --configdir $(dirname $CFG) --scrub=all"
-      trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --scrub=all
+      echo "$MOCK --root $CFG --configdir $(dirname $CFG) --scrub=all"
+      trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --scrub=all
       echo "=================================="
-      echo "$MOCK -r $CFG --configdir $(dirname $CFG) --clean"
-      trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --clean
+      echo "$MOCK --root $CFG --configdir $(dirname $CFG) --clean"
+      trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --clean
       ### Note:  this sometimes leaves behind a $MY_WORKSPACE/cache/mock/yum_cache/yumcache.lock
       echo "=================================="
       mock_clean_cache_all_cfg $CFG
@@ -1034,10 +1046,10 @@ mock_partial_clean_cfg () {
    local RPMS_CLEAN_LIST=""
    local NEED_FULL_MOCK_CLEAN=0
    for r in $RPMS_LIST; do
-       if ! str_lst_contains $r "$NO_CLEAN_LIST" ; then 
+       if ! str_lst_contains $r "$NO_CLEAN_LIST" ; then
            RPMS_CLEAN_LIST=$(join_by ' ' $RPMS_CLEAN_LIST $r)
-       else 
-           echo "Can't remove '$r' from mock environment without a wipe"; 
+       else
+           echo "Can't remove '$r' from mock environment without a wipe";
            NEED_FULL_MOCK_CLEAN=1
        fi
    done
@@ -1050,19 +1062,19 @@ mock_partial_clean_cfg () {
        # Intent of following is for $RPMS_LIST to be expand now while the remaining $ varaibles are for bash inside mock to expand
        echo "Try to uninstall from the mock environment these packages: $RPMS_CLEAN_LIST"
        CMD='LST="'$RPMS_CLEAN_LIST'";
-            DELETE_LIST=""; 
-            for r in $LST; do 
-                  FOUND=$(rpm  -q $r) ; 
-                  if [ $? -eq 0 ]; then 
-                     DELETE_LIST="$DELETE_LIST $FOUND"; 
-                  fi; 
-            done; 
-            echo "uninstalling these packages: $DELETE_LIST"; 
+            DELETE_LIST="";
+            for r in $LST; do
+                  FOUND=$(rpm  -q $r) ;
+                  if [ $? -eq 0 ]; then
+                     DELETE_LIST="$DELETE_LIST $FOUND";
+                  fi;
+            done;
+            echo "uninstalling these packages: $DELETE_LIST";
             if [ "$DELETE_LIST" != "" ]; then
                 rpm  -e --nodeps $DELETE_LIST;
             fi'
-       echo "$MOCK -r $CFG --configdir $(dirname $CFG) --chroot bash -c $CMD" &> $TMP
-       trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --chroot "bash -c '$CMD'" &>> $TMP
+       echo "$MOCK --root $CFG --configdir $(dirname $CFG) --chroot bash -c $CMD" &> $TMP
+       trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --chroot "bash -c '$CMD'" &>> $TMP
        RC=$?
        if [ $RC -ne 0 ]; then
            cat $TMP
@@ -1112,8 +1124,8 @@ mock_clean_cache_cfg () {
 
    clean_yum_cache_cfg $CFG
 
-   echo "$MOCK -r $CFG --configdir $(dirname $CFG) --scrub=root-cache --scrub=yum-cache --scrub=cache" &> $TMP
-   trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --scrub=root-cache --scrub=yum-cache --scrub=cache &>> $TMP
+   echo "$MOCK --root $CFG --configdir $(dirname $CFG) --scrub=root-cache --scrub=yum-cache --scrub=cache" &> $TMP
+   trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --scrub=root-cache --scrub=yum-cache --scrub=cache &>> $TMP
    RC=$?
    if [ $RC -ne 0 ]; then
       cat $TMP
@@ -1141,8 +1153,8 @@ mock_clean_cache_all_cfg () {
    echo "=================================="
    clean_yum_cache_cfg $CFG
    echo "=================================="
-   echo "$MOCK -r $CFG --configdir $(dirname $CFG) --scrub=all"
-   trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --scrub=all
+   echo "$MOCK --root $CFG --configdir $(dirname $CFG) --scrub=all"
+   trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --scrub=all
    echo "=================================="
 }
 
@@ -1169,9 +1181,16 @@ mock_clean_metadata_cfg () {
       return 1
    fi
 
-   CMD=$((cat $CFG; grep config_opts\\[\'yum.conf\'\\\] $CFG | sed 's#\\n#\n#g') | grep '^[[]' | grep -v main | sed 's/[][]//g' | sed 's#^#yum --enablerepo=#' | sed 's#$# clean metadata#' | sort -u | tr '\n' ';')
-   echo "$MOCK -r $CFG --configdir $(dirname $CFG) --chroot bash -c $CMD" &> $TMP
-   trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --chroot "bash -c '($CMD)'" &>>$TMP
+   CMD=$((cat $CFG; \
+                 grep config_opts\\[\'yum.conf\'\\\] $CFG | \
+                 sed 's#\\n#\n#g') | \
+                 grep '^[[]' | \
+                 grep -v main | \
+                 sed -e 's/[][]//g' -e "s#^#${PKG_MANAGER} --enablerepo=#" -e 's#$# clean metadata#' | \
+                 sort -u | \
+                 tr '\n' ';')
+   echo "$MOCK --root $CFG --configdir $(dirname $CFG) --chroot bash -c $CMD" &> $TMP
+   trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --chroot "bash -c '($CMD)'" &>>$TMP
    RC=$?
    if [ $RC -ne 0 ]; then
       cat $TMP
@@ -1228,7 +1247,7 @@ update_cgcs_repo () {
        if [ "x$NEW_UNTRACKED" != "x" ]; then
           NEED_REBUILD=1
        fi
-    
+
        if [ $NEED_REBUILD -eq 1 ]; then
           NEED_MOCK_CLEAN=1
           echo ""
@@ -1274,7 +1293,7 @@ mock_clean_mounts_dir () {
          fi
       fi
       if [ $RC -eq 1 ]; then
-         echo "ERROR: Directory '$MOUNT' is already mounted and will cause a build failure within mock." 
+         echo "ERROR: Directory '$MOUNT' is already mounted and will cause a build failure within mock."
          echo "Ask your system administrator to umount '$MOUNT'."
          exit 1
       fi
@@ -1319,7 +1338,7 @@ clean_yum_cache_cfg () {
    local YUM_CACHE_MOUNT=$(readlink -f "$ROOT_DIR/root/var/cache/yum")
    local YUM_CACHE_LOCK="$CACHE_DIR/mock/yum_cache/yumcache.lock"
    # echo "clean_yum_cache YUM_CACHE_MOUNT='$YUM_CACHE_MOUNT' YUM_CACHE_LOCK='$YUM_CACHE_LOCK'"
-   
+
    if [ "$YUM_CACHE_MOUNT" != "" ]; then
       mock_clean_mounts_dir "$YUM_CACHE_MOUNT"
    fi
@@ -1358,8 +1377,8 @@ mock_update_cfg () {
    echo "${FUNCNAME[0]}: $CFG"
    echo "=================================="
    set_mock_symlinks $CFG
-   echo "$MOCK -r $CFG --configdir $(dirname $CFG) --update"
-   trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --update 
+   echo "$MOCK --root $CFG --configdir $(dirname $CFG) --update"
+   trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --update
    echo "=================================="
 }
 
@@ -1368,8 +1387,8 @@ mock_init_cfg () {
    echo "${FUNCNAME[0]}: $CFG"
    echo "=================================="
    set_mock_symlinks $CFG
-   echo "$MOCK -r $CFG --configdir $(dirname $CFG) --init"
-   trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --init
+   echo "$MOCK --root $CFG --configdir $(dirname $CFG) --init"
+   trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --init
    echo "=================================="
 }
 
@@ -1388,14 +1407,14 @@ mock_update_or_init_cfg () {
    if [ -d $ROOT_DIR/root ]; then
       echo "Updating the mock environment"
       set_mock_symlinks $CFG
-      echo "$MOCK -r $CFG --configdir $(dirname $CFG) --update"
-      trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --update  &> $TMP
+      echo "$MOCK --root $CFG --configdir $(dirname $CFG) --update"
+      trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --update  &> $TMP
       RC=$?
    else
       echo "Init the mock environment"
       set_mock_symlinks $CFG
-      echo "$MOCK -r $CFG --configdir $(dirname $CFG) --init"
-      trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --init &> $TMP
+      echo "$MOCK --root $CFG --configdir $(dirname $CFG) --init"
+      trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --init &> $TMP
       RC=$?
    fi
    if [ $RC -ne 0 ]; then
@@ -1411,7 +1430,7 @@ mock_update_or_init () {
       local PREFIX=$(echo $SUB_CFG | rev | cut -d . -f 2 | rev)
       ( mock_update_or_init_cfg $SUB_CFG 2>&1 | sed "s#^#${PREFIX}: #" ; exit ${PIPESTATUS[0]} ) &
    done
-   wait 
+   wait
    echo "${FUNCNAME[0]}: out"
 }
 
@@ -1429,12 +1448,12 @@ NO_DESCENDANTS=0
 NO_REQUIRED=0
 NO_AUTOCLEAN=0
 NO_BUILD_INFO=0
-HELP=0 
+HELP=0
 CLEAN_FLAG=0
 FORMAL_FLAG=0
 CAREFUL=0
 DEP_TEST_FLAG=0
-   
+
 # read the options
 TEMP=$(getopt -o h --long parallel,std,rt,installer,containers,no-required,no-descendants,no-autoclean,no-build-info,dep-test,clean,tmpfs-clean,formal,careful,help,layer: -n "$ME" -- "$@")
 
@@ -1470,7 +1489,7 @@ while true ; do
         --) shift ; break ;;
         *) echo "Internal error!" ; exit 1 ;;
     esac
-done 
+done
 
 # Reset variables
 if [ -n "$MY_WORKSPACE" ]; then
@@ -1729,7 +1748,7 @@ clean_list () {
                                   echo "rm -rf $d"
                                   \rm -rf "$d" 2>> /dev/null
                               done
-                              
+
                           else
                               rs=$(rpm_get_srpm $r)
                               if [[ "$rs" != "$sn"-[0-9]* ]]; then
@@ -1742,7 +1761,7 @@ clean_list () {
                    fi
                done
            done
-    
+
            TARGET=$(rpm -qp --qf '%{NAME}-%{VERSION}\n' "$s")
 
            if [ $CLEAN_FLAG -eq 1 ]; then
@@ -1782,7 +1801,7 @@ clean_list () {
 
        \rm -f -v $RESULT_DIR/mockchain.log 2>> /dev/null
        mock_clean
-   else  
+   else
        # If dependency test
        if [ $DEP_TEST_FLAG -eq 1 ]; then
            mock_clean
@@ -2045,7 +2064,7 @@ if [ $CLEAN_FLAG -eq 0 ] && [ $NO_DESCENDANTS -eq 0 ] && [ -f $SRPM_DIRECT_DESCE
    done
 
    # For non-std build, and if non specific build targets are named, then search all
-   # packages that we might build and check if they require a package that DID build 
+   # packages that we might build and check if they require a package that DID build
    # in the std build.  If so build the package as a secondary target, even though the
    # primary target was from a different build_type.
    if [ "$BUILD_TYPE" != "std" ] && [ $ALL -eq 1 ] && [ -f $SRPM_TO_RPM_MAP_FILE ] && [ -f $SRPM_RPM_DIRECT_REQUIRES_FILE ]; then
@@ -2105,7 +2124,7 @@ if [ $CLEAN_FLAG -eq 0 ] && [ $NO_DESCENDANTS -eq 0 ] && [ -f $SRPM_DIRECT_DESCE
        done
    fi
 
-   # If the kernel or kernel-rt packages where absent from the primary build targets, but 
+   # If the kernel or kernel-rt packages where absent from the primary build targets, but
    # added as a secondary target, then make sure all out-of-tree kernel modules are also
    # added.
    for n in kernel kernel-rt; do
@@ -2234,9 +2253,9 @@ echo "SRPMS_LIST = $SRPMS_LIST"
 echo "RPMS_LIST = $RPMS_LIST"
 
 
-echo 
+echo
 if [ $CLEAN_FLAG -eq 0 ]; then
-   # pre-create these directories as $USER, 
+   # pre-create these directories as $USER,
    # else mock will create them as root and fails to clean them.
    # Note: keep these in sync with mockchain-parallel!
    for i in $(seq 0 $((MAX_WORKERS-1))); do
@@ -2299,15 +2318,28 @@ mock_clean_metadata
 echo
 echo "Building"
 
+recreate_repodata $BUILD_BASE/results/$BUILD_ENVIRONMENT_DIR
+
 CMD_PREFIX=""
 if [ -x /bin/ionice ]; then
     CMD_PREFIX="nice -n 20 ionice -c Idle /bin/ionice "
 fi
 
-CMD_OPTIONS="-m --no-clean -m --no-cleanup-after"
-if [ $CAREFUL -eq 1 ]; then
-   CMD_OPTIONS="-m --no-cleanup-after"
+REAL_MOCKCHAIN=0
+MOCK_PASSTHROUGH="-m"
+MOCKCHAIN="mockchain-parallel"
+CHAIN_OPTION=""
+if file $(which mockchain) | grep -q 'Python script'; then
+    REAL_MOCKCHAIN=1
 fi
+
+CMD_OPTIONS="$MOCK_PASSTHROUGH --no-clean $MOCK_PASSTHROUGH --no-cleanup-after"
+if [ $CAREFUL -eq 1 ]; then
+   CMD_OPTIONS="$MOCK_PASSTHROUGH --no-cleanup-after"
+fi
+
+CMD_OPTIONS+=" --log=$MOCKCHAIN_LOG"
+
 echo "CAREFUL=$CAREFUL"
 
 # Sets WORKERS and MOCKCHAIN_RESOURCE_ALLOCATION
@@ -2315,13 +2347,13 @@ compute_resources $SRPMS_LIST
 
 
 if [ -f $SRPM_RPM_DIRECT_REQUIRES_FILE ]; then
-    CMD_OPTIONS="$CMD_OPTIONS --srpm-dependency-file $SRPM_RPM_DIRECT_REQUIRES_FILE"
+    CMD_OPTIONS+=" --srpm-dependency-file $SRPM_RPM_DIRECT_REQUIRES_FILE"
 fi
 if [ -f "$RPM_DIRECT_REQUIRES_FILE" ]; then
-    CMD_OPTIONS="$CMD_OPTIONS --rpm-dependency-file $RPM_DIRECT_REQUIRES_FILE"
+    CMD_OPTIONS+=" --rpm-dependency-file $RPM_DIRECT_REQUIRES_FILE"
 fi
 if [ -f "$RPM_TO_SRPM_MAP_FILE" ]; then
-    CMD_OPTIONS="$CMD_OPTIONS --rpm-to-srpm-map-file $RPM_TO_SRPM_MAP_FILE"
+    CMD_OPTIONS+=" --rpm-to-srpm-map-file $RPM_TO_SRPM_MAP_FILE"
 fi
 
 
@@ -2342,12 +2374,12 @@ echo "MAX_WORKERS=$MAX_WORKERS"
 echo "MOCKCHAIN_RESOURCE_ALLOCATION=$MOCKCHAIN_RESOURCE_ALLOCATION"
 
 
-CMD="$CMD_PREFIX mockchain-parallel -r $BUILD_CFG -l $BUILD_BASE --recurse --workers=$MAX_WORKERS --worker-resources=$MOCKCHAIN_RESOURCE_ALLOCATION --basedir=$MY_WORKSPACE --log=$MOCKCHAIN_LOG --tmp_prefix=$USER --addrepo=$LOCAL_URL --addrepo=$LOCAL_SRC_URL $CMD_OPTIONS -m --rebuild $SRPMS_LIST"
+CMD="$CMD_PREFIX $MOCKCHAIN --root $BUILD_CFG --localrepo $BUILD_BASE --recurse --workers=$MAX_WORKERS --worker-resources=$MOCKCHAIN_RESOURCE_ALLOCATION --basedir=$MY_WORKSPACE --tmp_prefix=$USER --addrepo=$LOCAL_URL --addrepo=$LOCAL_SRC_URL $CMD_OPTIONS $MOCK_PASSTHROUGH --rebuild"
+CMD_BUILD_LIST="$CHAIN_OPTION $SRPMS_LIST"
 echo ""
-echo "$CMD -m --define='_tis_dist .tis' -m --define='platform_release $PLATFORM_RELEASE'" 
+echo "$CMD $MOCK_PASSTHROUGH --define='_tis_dist .tis' $MOCK_PASSTHROUGH --define='platform_release $PLATFORM_RELEASE' $CMD_BUILD_LIST"
 echo ""
-
-trapwrap stdbuf -o0 $CMD -m --define="_tis_dist .tis" -m --define="platform_release $PLATFORM_RELEASE"
+trapwrap stdbuf -o0 $CMD $MOCK_PASSTHROUGH --define="_tis_dist .tis" $MOCK_PASSTHROUGH --define="platform_release $PLATFORM_RELEASE" $CMD_BUILD_LIST
 MOCKCHAIN_RC=$?
 
 echo $PLATFORM_RELEASE > $LAST_PLATFORM_RELEASE_FILE
@@ -2357,7 +2389,7 @@ if [ $CLEAN_FLAG -eq 0 ]; then
 fi
 
 for d in $(find $RESULT_DIR -name '*.rpm' | grep -v '[.]src[.]rpm' | xargs --max-args=1 dirname | sort -u); do
-    rsync -u $d/*.rpm $RPM_DIR 
+    rsync -u $d/*.rpm $RPM_DIR
 done
 
 if [ $ALL -eq 1 ]; then
@@ -2441,5 +2473,5 @@ if [ 0$FORMAL_BUILD -eq 1 ] && [ "$USER" == "jenkins" ]; then
 	fi
 fi
 
-exit 0 
+exit 0
 ) 2>&1 | stdbuf -o0 awk '{ print strftime("%H:%M:%S"), $0; fflush(); }' | tee $(date "+$MY_WORKSPACE/build-rpms-parallel_%Y-%m-%d_%H-%M-%S.log") ; exit ${PIPESTATUS[0]}
diff --git a/build-tools/build-rpms-serial b/build-tools/build-rpms-serial
index 5bd7dbe7..0a6afbf7 100755
--- a/build-tools/build-rpms-serial
+++ b/build-tools/build-rpms-serial
@@ -1,20 +1,20 @@
 #!/bin/bash
 
 #
-# Copyright (c) 2018 Wind River Systems, Inc.
+# Copyright (c) 2018-2020 Wind River Systems, Inc.
 #
 # SPDX-License-Identifier: Apache-2.0
 #
 
-# 
+#
 # Builds rpm files from src.rpm files.
 #
 # This version compiles one package at a time.
-# 
-# The location of packages to be built is 
+#
+# The location of packages to be built is
 # $MY_WORKSPACE/<build-type>/rpmbuild/SRPMS.
 #
-# The build order is a derived from the BuildRequires in the 
+# The build order is a derived from the BuildRequires in the
 # spec files in the src.rpms.  Note that the BuildRequires sometimes
 # create dependency loops, so no correct order can be computed.  In these
 # cases we add a retry loop.  As long as one new package builds, we
@@ -103,7 +103,7 @@ create-no-clean-list () {
        local install_groups=""
        local install_packages=""
        local p
-    
+
        for p in $(grep "config_opts\['chroot_setup_cmd'\]" $MY_BUILD_CFG | tail -n1 | cut -d '=' -f 2 | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' -e "s/^'//" -e "s/'$//" -e 's/^install //'); do
           if [[ $p == @* ]] ; then
               install_groups=$(join_by ' ' $install_groups $(echo $p | cut -c 2-))
@@ -111,37 +111,44 @@ create-no-clean-list () {
               install_packages=$(join_by ' ' $install_packages $p)
           fi
        done
-    
+
        local noclean_last_list_len=0
        local noclean_list=""
        local tmp_list=""
        local g
-    
+
        for g in $install_groups; do
-           tmp_list=$(yum -c $MY_YUM_CONF groupinfo $g 2>> /dev/null | awk 'f;/Mandatory Packages:/{f=1}' | cut -c 5-)
+           # Find manditory packages in the group.
+           # Discard anything before (and including) 'Mandatory Packages:'
+           # and anything after (and including) 'Optional Packages:'.
+           # Also discard leading spaces or '+' characters.
+           tmp_list=$(${PKG_MANAGER} -c $MY_YUM_CONF groupinfo $g 2>> /dev/null \
+                        | awk 'f;/Mandatory Packages:/{f=1}' \
+                        | sed -n '/Optional Packages:/q;p' \
+                        | sed 's#[ +]*##')
            noclean_list=$(join_by ' ' $noclean_list $tmp_list)
        done
-    
+
        noclean_list=$(join_by ' ' $noclean_list $install_packages)
        noclean_list=$(echo $noclean_list | tr ' ' '\n' | sort --uniq)
        noclean_list_len=$(echo $noclean_list | wc -w)
-    
+
        while [ $noclean_list_len -gt $noclean_last_list_len ]; do
            noclean_last_list_len=$noclean_list_len
            noclean_list=$( (yum -c $MY_YUM_CONF deplist $noclean_list 2>> /dev/null | grep provider: | awk '{ print $2 }' | awk -F . '{ print $1 }'; for p in $noclean_list; do echo $p; done) | sort --uniq)
            noclean_list_len=$(echo $noclean_list | wc -w)
        done
-   
+
        echo $noclean_list > $NO_CLEAN_LIST_FILE
    fi
 
    cat $NO_CLEAN_LIST_FILE
 }
 
-str_lst_contains() { 
+str_lst_contains() {
    TARGET="$1"
    LST="$2"
-   if [[ $LST =~ (^|[[:space:]])$TARGET($|[[:space:]]) ]] ; then 
+   if [[ $LST =~ (^|[[:space:]])$TARGET($|[[:space:]]) ]] ; then
       return 0
    else
       return 1
@@ -169,7 +176,9 @@ create_lst () {
 recreate_repodata () {
    local DIR=${1}
 
-       (cd $DIR
+       (
+        mkdir -p $DIR
+        cd $DIR
         if [ -f repodata/*comps*xml ]; then
            \mv repodata/*comps*xml comps.xml
         fi
@@ -260,11 +269,11 @@ union () {
          echo $b
       fi
    done
-} 
+}
 
 #
 # returns 0 if element is in the array
-# 
+#
 #  e.g.  contains ARRAY $SEEKING  && echo "$SEEKING is in 'ARRAY'"
 #
 contains () {
@@ -311,7 +320,7 @@ build_order_recursive () {
          needs=( $(grep "^$target;" "$SRPM_DIRECT_REQUIRES_FILE" | sed "s/$target;//" | sed 's/,/ /g') )
          needs_list=( $(intersection needs remainder_list) )
          for((idx=0;idx<${#needs_list[@]};idx++)); do
-             build_order_recursive ${needs_list[idx]} 
+             build_order_recursive ${needs_list[idx]}
          done
          echo $target
          break
@@ -361,7 +370,7 @@ build_order () {
       UNORDERED_LIST=( ${original_list[@]} )
       while [ ${#UNORDERED_LIST[@]} -gt 0 ]; do
          element=${UNORDERED_LIST[0]}
-         build_order_recursive $element 
+         build_order_recursive $element
       done
    fi
 }
@@ -476,7 +485,7 @@ kill_descendents ()
         recursive_promote_children=""
         recursive_children=$(pgrep -P $kill_pid)
     fi
-    
+
     if [ $iteration -eq 0 ]; then
         other_children=$(for relevant_child in $relevant_other_children; do pgrep -P $kill_pid $relevant_child; done)
         if [ "$other_children" != "" ]; then
@@ -491,7 +500,7 @@ kill_descendents ()
     fi
 
     for pid in $recursive_children; do
-        kill_descendents "$pid" $kill_all $need_stop $((iteration + 1)) 
+        kill_descendents "$pid" $kill_all $need_stop $((iteration + 1))
     done
     for pid in $recursive_promote_children; do
         kill_descendents "$pid" 1 1 $((iteration + 1))
@@ -754,11 +763,11 @@ mock_clean_cfg () {
       echo "=================================="
       mock_clean_cache_cfg $CFG
       echo "=================================="
-      echo "$MOCK -r $CFG --configdir $(dirname $CFG) --scrub=all"
-      trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --scrub=all
+      echo "$MOCK --root $CFG --configdir $(dirname $CFG) --scrub=all"
+      trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --scrub=all
       echo "=================================="
-      echo "$MOCK -r $CFG --configdir $(dirname $CFG) --clean"
-      trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --clean
+      echo "$MOCK --root $CFG --configdir $(dirname $CFG) --clean"
+      trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --clean
       ### Note:  this sometimes leaves behind a $MY_WORKSPACE/cache/mock/yum_cache/yumcache.lock
       echo "=================================="
       mock_clean_cache_all_cfg $CFG
@@ -833,10 +842,10 @@ mock_partial_clean_cfg () {
    local RPMS_CLEAN_LIST=""
    local NEED_FULL_MOCK_CLEAN=0
    for r in $RPMS_LIST; do
-       if ! str_lst_contains $r "$NO_CLEAN_LIST" ; then 
+       if ! str_lst_contains $r "$NO_CLEAN_LIST" ; then
            RPMS_CLEAN_LIST=$(join_by ' ' $RPMS_CLEAN_LIST $r)
-       else 
-           echo "Can't remove '$r' from mock environment without a wipe"; 
+       else
+           echo "Can't remove '$r' from mock environment without a wipe";
            NEED_FULL_MOCK_CLEAN=1
        fi
    done
@@ -849,19 +858,19 @@ mock_partial_clean_cfg () {
        # Intent of following is for $RPMS_LIST to be expand now while the remaining $ varaibles are for bash inside mock to expand
        echo "Try to uninstall from the mock environment these packages: $RPMS_CLEAN_LIST"
        CMD='LST="'$RPMS_CLEAN_LIST'";
-            DELETE_LIST=""; 
-            for r in $LST; do 
-                  FOUND=$(rpm  -q $r) ; 
-                  if [ $? -eq 0 ]; then 
-                     DELETE_LIST="$DELETE_LIST $FOUND"; 
-                  fi; 
-            done; 
-            echo "uninstalling these packages: $DELETE_LIST"; 
+            DELETE_LIST="";
+            for r in $LST; do
+                  FOUND=$(rpm  -q $r) ;
+                  if [ $? -eq 0 ]; then
+                     DELETE_LIST="$DELETE_LIST $FOUND";
+                  fi;
+            done;
+            echo "uninstalling these packages: $DELETE_LIST";
             if [ "$DELETE_LIST" != "" ]; then
                 rpm  -e --nodeps $DELETE_LIST;
             fi'
-       echo "$MOCK -r $CFG --configdir $(dirname $CFG) --chroot bash -c $CMD" &> $TMP
-       trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --chroot "bash -c '$CMD'" &>> $TMP
+       echo "$MOCK --root $CFG --configdir $(dirname $CFG) --chroot bash -c $CMD" &> $TMP
+       trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --chroot "bash -c '$CMD'" &>> $TMP
        RC=$?
        if [ $RC -ne 0 ]; then
            cat $TMP
@@ -907,8 +916,8 @@ mock_clean_cache_cfg () {
 
    clean_yum_cache_cfg $CFG
 
-   echo "$MOCK -r $CFG --configdir $(dirname $CFG) --scrub=root-cache --scrub=yum-cache --scrub=cache" &> $TMP
-   trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --scrub=root-cache --scrub=yum-cache --scrub=cache &>> $TMP
+   echo "$MOCK --root $CFG --configdir $(dirname $CFG) --scrub=root-cache --scrub=yum-cache --scrub=cache" &> $TMP
+   trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --scrub=root-cache --scrub=yum-cache --scrub=cache &>> $TMP
    RC=$?
    if [ $RC -ne 0 ]; then
       cat $TMP
@@ -931,8 +940,8 @@ mock_clean_cache_all_cfg () {
    echo "=================================="
    clean_yum_cache_cfg $CFG
    echo "=================================="
-   echo "$MOCK -r $CFG --configdir $(dirname $CFG) --scrub=all"
-   trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --scrub=all
+   echo "$MOCK --root $CFG --configdir $(dirname $CFG) --scrub=all"
+   trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --scrub=all
    echo "=================================="
 }
 
@@ -956,8 +965,8 @@ mock_clean_metadata_cfg () {
    fi
 
    CMD=$((cat $CFG; grep config_opts\\[\'yum.conf\'\\\] $CFG | sed 's#\\n#\n#g') | grep '^[[]' | grep -v main | sed 's/[][]//g' | sed 's#^#yum --enablerepo=#' | sed 's#$# clean metadata#' | sort -u | tr '\n' ';')
-   echo "$MOCK -r $CFG --configdir $(dirname $CFG) --chroot bash -c $CMD" &> $TMP
-   trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --chroot "bash -c '($CMD)'" &>>$TMP
+   echo "$MOCK --root $CFG --configdir $(dirname $CFG) --chroot bash -c $CMD" &> $TMP
+   trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --chroot "bash -c '($CMD)'" &>>$TMP
    RC=$?
    if [ $RC -ne 0 ]; then
       cat $TMP
@@ -1010,7 +1019,7 @@ update_cgcs_repo () {
        if [ "x$NEW_UNTRACKED" != "x" ]; then
           NEED_REBUILD=1
        fi
-    
+
        if [ $NEED_REBUILD -eq 1 ]; then
           NEED_MOCK_CLEAN=1
           echo ""
@@ -1056,7 +1065,7 @@ mock_clean_mounts_dir () {
          fi
       fi
       if [ $RC -eq 1 ]; then
-         echo "ERROR: Directory '$MOUNT' is already mounted and will cause a build failure within mock." 
+         echo "ERROR: Directory '$MOUNT' is already mounted and will cause a build failure within mock."
          echo "Ask your system administrator to umount '$MOUNT'."
          exit 1
       fi
@@ -1097,7 +1106,7 @@ clean_yum_cache_cfg () {
    local YUM_CACHE_MOUNT=$(readlink -f "$ROOT_DIR/root/var/cache/yum")
    local YUM_CACHE_LOCK="$CACHE_DIR/mock/yum_cache/yumcache.lock"
    # echo "clean_yum_cache YUM_CACHE_MOUNT='$YUM_CACHE_MOUNT' YUM_CACHE_LOCK='$YUM_CACHE_LOCK'"
-   
+
    if [ "$YUM_CACHE_MOUNT" != "" ]; then
       mock_clean_mounts_dir "$YUM_CACHE_MOUNT"
    fi
@@ -1131,8 +1140,8 @@ mock_update_cfg () {
    echo "${FUNCNAME[0]}: $CFG"
    echo "=================================="
    set_mock_symlinks $CFG
-   echo "$MOCK -r $CFG --configdir $(dirname $CFG) --update"
-   trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --update 
+   echo "$MOCK --root $CFG --configdir $(dirname $CFG) --update"
+   trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --update
    echo "=================================="
 }
 
@@ -1141,8 +1150,8 @@ mock_init_cfg () {
    echo "${FUNCNAME[0]}: $CFG"
    echo "=================================="
    set_mock_symlinks $CFG
-   echo "$MOCK -r $CFG --configdir $(dirname $CFG) --init"
-   trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --init
+   echo "$MOCK --root $CFG --configdir $(dirname $CFG) --init"
+   trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --init
    echo "=================================="
 }
 
@@ -1161,14 +1170,14 @@ mock_update_or_init_cfg () {
    if [ -d $ROOT_DIR/root ]; then
       echo "Updating the mock environment"
       set_mock_symlinks $CFG
-      echo "$MOCK -r $CFG --configdir $(dirname $CFG) --update"
-      trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --update  &> $TMP
+      echo "$MOCK --root $CFG --configdir $(dirname $CFG) --update"
+      trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --update  &> $TMP
       RC=$?
    else
       echo "Init the mock environment"
       set_mock_symlinks $CFG
-      echo "$MOCK -r $CFG --configdir $(dirname $CFG) --init"
-      trapwrap_n $CFG $MOCK -r $CFG --configdir $(dirname $CFG) --init &> $TMP
+      echo "$MOCK --root $CFG --configdir $(dirname $CFG) --init"
+      trapwrap_n $CFG $MOCK --root $CFG --configdir $(dirname $CFG) --init &> $TMP
       RC=$?
    fi
    if [ $RC -ne 0 ]; then
@@ -1198,12 +1207,12 @@ NO_DESCENDANTS=0
 NO_REQUIRED=0
 NO_AUTOCLEAN=0
 NO_BUILD_INFO=0
-HELP=0 
+HELP=0
 CLEAN_FLAG=0
 FORMAL_FLAG=0
 CAREFUL=0
 DEP_TEST_FLAG=0
-   
+
 # read the options
 TEMP=$(getopt -o h --long serial,std,rt,installer,containers,no-required,no-descendants,no-autoclean,no-build-info,dep-test,clean,formal,careful,help,layer: -n "$ME" -- "$@")
 
@@ -1238,7 +1247,7 @@ while true ; do
         --) shift ; break ;;
         *) echo "Internal error!" ; exit 1 ;;
     esac
-done 
+done
 
 
 # Reset variables
@@ -1493,7 +1502,7 @@ clean_list () {
                                   echo "rm -rf $d"
                                   \rm -rf "$d" 2>> /dev/null
                               done
-                              
+
                           else
                               rs=$(rpm_get_srpm $r)
                               if [[ "$rs" != "$sn"-[0-9]* ]]; then
@@ -1506,7 +1515,7 @@ clean_list () {
                    fi
                done
            done
-    
+
            TARGET=$(rpm -qp --qf '%{NAME}-%{VERSION}\n' "$s")
 
            if [ $CLEAN_FLAG -eq 1 ]; then
@@ -1542,7 +1551,7 @@ clean_list () {
 
        \rm -f -v $RESULT_DIR/mockchain.log 2>> /dev/null
        mock_clean
-   else  
+   else
        # If dependency test
        if [ $DEP_TEST_FLAG -eq 1 ]; then
            mock_clean
@@ -1801,7 +1810,7 @@ if [ $CLEAN_FLAG -eq 0 ] && [ $NO_DESCENDANTS -eq 0 ] && [ -f $SRPM_DIRECT_DESCE
    done
 
    # For non-std build, and if non specific build targets are named, then search all
-   # packages that we might build and check if they require a package that DID build 
+   # packages that we might build and check if they require a package that DID build
    # in the std build.  If so build the package as a secondary target, even though the
    # primary target was from a different build_type.
    if [ "$BUILD_TYPE" != "std" ] && [ $ALL -eq 1 ] && [ -f $SRPM_TO_RPM_MAP_FILE ] && [ -f $SRPM_RPM_DIRECT_REQUIRES_FILE ]; then
@@ -1861,7 +1870,7 @@ if [ $CLEAN_FLAG -eq 0 ] && [ $NO_DESCENDANTS -eq 0 ] && [ -f $SRPM_DIRECT_DESCE
        done
    fi
 
-   # If the kernel or kernel-rt packages where absent from the primary build targets, but 
+   # If the kernel or kernel-rt packages where absent from the primary build targets, but
    # added as a secondary target, then make sure all out-of-tree kernel modules are also
    # added.
    for n in kernel kernel-rt; do
@@ -1996,9 +2005,9 @@ echo "SRPMS_LIST = $SRPMS_LIST"
 echo "RPMS_LIST = $RPMS_LIST"
 
 
-echo 
+echo
 if [ $CLEAN_FLAG -eq 0 ]; then
-   # pre-create these directories as $USER, 
+   # pre-create these directories as $USER,
    # else mock will create them as root and fails to clean them.
    # Note: keep these in sync with mockchain-parallel!
    mkdir -p $MY_WORKSPACE/mock
@@ -2059,27 +2068,46 @@ mock_clean_metadata
 echo
 echo "Building"
 
+recreate_repodata $BUILD_BASE/results/$BUILD_ENVIRONMENT_DIR
+
 CMD_PREFIX=""
 if [ -x /bin/ionice ]; then
     CMD_PREFIX="nice -n 20 ionice -c Idle /bin/ionice "
 fi
 
-CMD_OPTIONS="-m --no-clean -m --no-cleanup-after"
+REAL_MOCKCHAIN=0
+MOCK_PASSTHROUGH=""
+MOCKCHAIN="mock"
+CHAIN_OPTION="--chain"
+if file $(which mockchain) | grep -q 'Python script'; then
+    REAL_MOCKCHAIN=1
+    MOCK_PASSTHROUGH="-m"
+    MOCKCHAIN="mockchain"
+    CHAIN_OPTION=""
+fi
+
+CMD_OPTIONS="$MOCK_PASSTHROUGH --no-clean $MOCK_PASSTHROUGH --no-cleanup-after"
 if [ $CAREFUL -eq 1 ]; then
-   CMD_OPTIONS="-m --no-cleanup-after"
+   CMD_OPTIONS="$MOCK_PASSTHROUGH --no-cleanup-after"
+fi
+if [ $REAL_MOCKCHAIN -eq 1 ]; then
+    CMD_OPTIONS+=" --log=$MOCKCHAIN_LOG"
 fi
 echo "CAREFUL=$CAREFUL"
 echo "CMD_OPTIONS=$CMD_OPTIONS"
 
-CMD="$CMD_PREFIX mockchain -r $BUILD_CFG -l $BUILD_BASE --recurse --log=$MOCKCHAIN_LOG --tmp_prefix=$USER --addrepo=$LOCAL_URL --addrepo=$LOCAL_SRC_URL -m --rootdir=$BUILD_BASE/mock/root $CMD_OPTIONS -m --rebuild $SRPMS_LIST"
-echo "$CMD -m --define='_tis_dist .tis' -m --define='platform_release $PLATFORM_RELEASE'" 
-trapwrap stdbuf -o0 $CMD -m --define='_tis_dist .tis' -m --define="platform_release $PLATFORM_RELEASE"
+CMD="$CMD_PREFIX $MOCKCHAIN --root $BUILD_CFG --localrepo $BUILD_BASE --recurse --tmp_prefix=$USER --addrepo=$LOCAL_URL --addrepo=$LOCAL_SRC_URL $MOCK_PASSTHROUGH --rootdir=$BUILD_BASE/mock/root $CMD_OPTIONS $MOCK_PASSTHROUGH --rebuild"
+CMD_BUILD_LIST="$CHAIN_OPTION $SRPMS_LIST"
+echo ""
+echo "$CMD $MOCK_PASSTHROUGH --define='_tis_dist .tis' $MOCK_PASSTHROUGH --define='platform_release $PLATFORM_RELEASE' $CMD_BUILD_LIST"
+echo ""
+trapwrap stdbuf -o0 $CMD $MOCK_PASSTHROUGH --define="_tis_dist .tis" $MOCK_PASSTHROUGH --define="platform_release $PLATFORM_RELEASE" $CMD_BUILD_LIST
 MOCKCHAIN_RC=$?
 
 echo $PLATFORM_RELEASE > $LAST_PLATFORM_RELEASE_FILE
 
 for d in $(find $RESULT_DIR -name '*.rpm' | grep -v '[.]src[.]rpm' | xargs --max-args=1 dirname | sort -u); do
-    rsync -u $d/*.rpm $RPM_DIR 
+    rsync -u $d/*.rpm $RPM_DIR
 done
 
 if [ $ALL -eq 1 ]; then
@@ -2163,5 +2191,5 @@ if [ 0$FORMAL_BUILD -eq 1 ] && [ "$USER" == "jenkins" ]; then
 	fi
 fi
 
-exit 0 
+exit 0
 ) 2>&1 | stdbuf -o0 awk '{ print strftime("%H:%M:%S"), $0; fflush(); }' | tee $(date "+$MY_WORKSPACE/build-rpms-serial_%Y-%m-%d_%H-%M-%S.log") ; exit ${PIPESTATUS[0]}
diff --git a/build-tools/build_iso/cgts_deps.sh b/build-tools/build_iso/cgts_deps.sh
index e1ccbf96..ab45352d 100755
--- a/build-tools/build_iso/cgts_deps.sh
+++ b/build-tools/build_iso/cgts_deps.sh
@@ -1,5 +1,11 @@
 #!/bin/env bash
 
+#
+# Copyright (c) 2018-2020 Wind River Systems, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
 # Here's the score, kids.  There are a few different places from which we can
 # get packages.  In priority order, they are:
 #
@@ -26,21 +32,33 @@
 #   export/dist/report_deps.txt
 #
 
+CGTS_DEPS_DIR="$(dirname "$(readlink -f "${BASH_SOURCE[0]}" )" )"
+
+# Set REPOQUERY, REPOQUERY_SUB_COMMAND, REPOQUERY_RESOLVE and
+# REPOQUERY_WHATPROVIDES_DELIM for our build environment.
+source ${CGTS_DEPS_DIR}/../pkg-manager-utils.sh
+
 # This function generates a simple file of dependencies we're trying to resolve
 function generate_dep_list {
     TMP_RPM_DB=$(mktemp -d $(pwd)/tmp_rpm_db_XXXXXX)
     mkdir -p $TMP_RPM_DB
     rpm --initdb --dbpath $TMP_RPM_DB
-    rpm --dbpath $TMP_RPM_DB --test -Uvh --replacefiles '*.rpm' >> $DEPDETAILLISTFILE 2>&1
-    rpm --dbpath $TMP_RPM_DB --test -Uvh --replacefiles '*.rpm' 2>&1 \
-        | grep -v "error:" \
-        | grep -v "warning:" \
-        | grep -v "Preparing..." \
-        | grep -v "installing package" \
-        | sed "s/ is needed by.*$//" | sed "s/ >=.*$//" | sort -u > $DEPLISTFILE
+    rpm --dbpath $TMP_RPM_DB --test -Uvh --replacefiles '*.rpm' > $DEPLISTFILE_NEW 2>&1
+    cat $DEPLISTFILE_NEW >> $DEPDETAILLISTFILE
+    cat $DEPLISTFILE_NEW \
+        | grep -v   -e "error:" -e "warning:" -e "Preparing..." \
+                    -e "Verifying..." -e "installing package" \
+        | sed -e "s/ is needed by.*$//" -e "s/ [<=>].*$//" \
+        | sort -u > $DEPLISTFILE
     \rm -rf $TMP_RPM_DB
 }
 
+join_array() {
+    local IFS="$1"
+    shift
+    echo "$*"
+}
+
 # Takes a list of requirements (either explcit package name, or capabilities
 # to provide) and install packages to meet those dependancies
 #
@@ -55,6 +73,7 @@ function generate_dep_list {
 # capabilities.
 function install_deps {
     local DEP_LIST=""
+    local DEP_LIST_ARRAY=()
     local DEP_LIST_FILE="$1"
 
     # Temporary files are used in a few different ways
@@ -68,7 +87,7 @@ function install_deps {
 
     while read DEP
     do
-        DEP_LIST="${DEP_LIST} ${DEP}"
+        DEP_LIST+=" '${DEP}'"
     done < $DEP_LIST_FILE
 
     echo "Debug: List of deps to resolve: ${DEP_LIST}"
@@ -79,8 +98,17 @@ function install_deps {
 
     # go through each repo and convert deps to packages based on package name
     for REPOID in `grep  '^[[].*[]]$' $YUM | grep -v '[[]main[]]' | awk -F '[][]' '{print $2 }'`; do
-        echo "TMPDIR=$TMP_DIR repoquery -c $YUM --repoid=$REPOID --arch=x86_64,noarch ${DEP_LIST} --qf='%{name}'"
-        TMPDIR=$TMP_DIR repoquery -c $YUM --repoid=$REPOID --arch=x86_64,noarch --qf='%{name}' ${DEP_LIST} | sed "s/kernel-debug/kernel/g" >> $UNSORTED_PACKAGES
+        echo "TMPDIR=${TMP_DIR}"\
+             "${REPOQUERY} --config=${YUM} --repoid=$REPOID"\
+             "${REPOQUERY_SUB_COMMAND} --arch=x86_64,noarch"\
+             "${DEP_LIST} --qf='%{name}'"
+
+        TMPDIR=${TMP_DIR} \
+            ${REPOQUERY} --config=${YUM} --repoid=$REPOID \
+            ${REPOQUERY_SUB_COMMAND} --arch=x86_64,noarch \
+            --qf='%{name}' ${DEP_LIST} \
+            | sed "s/kernel-debug/kernel/g" >> $UNSORTED_PACKAGES
+
         \rm -rf $TMP_DIR/yum-$USER-*
     done
     sort $UNSORTED_PACKAGES -u > $SORTED_PACKAGES
@@ -96,19 +124,31 @@ function install_deps {
     # If there are any requirements not resolved, look up the packages with
     # --whatprovides
     if [ -s $UNRESOLVED_PACKAGES ]; then
-        DEP_LIST=""
+        DEP_LIST_ARRAY=()
         \cp $SORTED_PACKAGES $UNSORTED_PACKAGES
         while read DEP
         do
-            DEP_LIST="${DEP_LIST} ${DEP}"
+            DEP_LIST_ARRAY+=( "${DEP}" )
         done < $UNRESOLVED_PACKAGES
 
-        DEP_LIST=$(echo "$DEP_LIST" | sed 's/^ //g')
-        if [ "$DEP_LIST" != "" ]; then
+        if [ "${REPOQUERY_WHATPROVIDES_DELIM}" != " " ]; then
+            DEP_LIST_ARRAY=( "$(join_array "${REPOQUERY_WHATPROVIDES_DELIM}" "${DEP_LIST_ARRAY[@]}" )" )
+        fi
+
+        if [ ${#DEP_LIST_ARRAY[@]} -gt 0 ]; then
 
             for REPOID in `grep  '^[[].*[]]$' $YUM | grep -v '[[]main[]]' | awk -F '[][]' '{print $2 }'`; do
-                echo "TMPDIR=$TMP_DIR repoquery -c $YUM --repoid=$REPOID --arch=x86_64,noarch --whatprovides ${DEP_LIST} --qf='%{name}'"
-                TMPDIR=$TMP_DIR repoquery -c $YUM --repoid=$REPOID --arch=x86_64,noarch --qf='%{name}' --whatprovides ${DEP_LIST} | sed "s/kernel-debug/kernel/g" >> $UNSORTED_PACKAGES
+                echo "TMPDIR=${TMP_DIR}"\
+                     "${REPOQUERY} --config=${YUM} --repoid=${REPOID}"\
+                     "${REPOQUERY_SUB_COMMAND} --arch=x86_64,noarch"\
+                     "--qf='%{name}' --whatprovides ${DEP_LIST_ARRAY[@]}"
+
+                TMPDIR=${TMP_DIR} \
+                    ${REPOQUERY} --config=${YUM} --repoid=${REPOID} \
+                    ${REPOQUERY_SUB_COMMAND} --arch=x86_64,noarch \
+                    --qf='%{name}' --whatprovides ${DEP_LIST_ARRAY[@]} \
+                    | sed "s/kernel-debug/kernel/g" >> $UNSORTED_PACKAGES
+
                 \rm -rf $TMP_DIR/yum-$USER-*
             done
         fi
@@ -124,12 +164,12 @@ function install_deps {
     DEP_LIST=" "
     while read DEP
     do
-        DEP_LIST="${DEP_LIST}${DEP} "
+        DEP_LIST+="${DEP} "
     done < $SORTED_PACKAGES
     rm $SORTED_PACKAGES
 
     # go through each repo and install packages
-    local TARGETS=${DEP_LIST}
+    local TARGETS="${DEP_LIST}"
     echo "Debug: Resolved list of deps to install: ${TARGETS}"
     local UNRESOLVED
     for REPOID in `grep  '^[[].*[]]$' $YUM | grep -v '[[]main[]]' | awk -F '[][]' '{print $2 }'`; do
@@ -137,8 +177,20 @@ function install_deps {
 
         if [[ ! -z "${TARGETS// }" ]]; then
             REPO_PATH=$(cat $YUM | sed -n "/^\[$REPOID\]\$/,\$p" | grep '^baseurl=' | head -n 1 | awk -F 'file://' '{print $2}' | sed 's:/$::')
-            >&2  echo "TMPDIR=$TMP_DIR repoquery -c $YUM --repoid=$REPOID --arch=x86_64,noarch --resolve $TARGETS --qf='%{name} %{name}-%{version}-%{release}.%{arch}.rpm %{relativepath}'"
-            TMPDIR=$TMP_DIR repoquery -c $YUM --repoid=$REPOID --arch=x86_64,noarch --resolve $TARGETS --qf="%{name} %{name}-%{version}-%{release}.%{arch}.rpm %{relativepath}" | sort -r -V > $TMPFILE
+
+            >&2 echo "TMPDIR=${TMP_DIR}"\
+                    "${REPOQUERY} --config=${YUM} --repoid=${REPOID}"\
+                    "${REPOQUERY_SUB_COMMAND} --arch=x86_64,noarch"\
+                    "--qf='%{name} %{name}-%{version}-%{release}.%{arch}.rpm %{relativepath}'"\
+                    "${REPOQUERY_RESOLVE} ${TARGETS}"
+
+            TMPDIR=${TMP_DIR} \
+                ${REPOQUERY} --config=${YUM} --repoid=${REPOID} \
+                ${REPOQUERY_SUB_COMMAND} --arch=x86_64,noarch \
+                --qf="%{name} %{name}-%{version}-%{release}.%{arch}.rpm %{relativepath}" \
+                ${REPOQUERY_RESOLVE} ${TARGETS} \
+                | sort -r -V > $TMPFILE
+
             \rm -rf $TMP_DIR/yum-$USER-*
 
             while read STR
@@ -157,7 +209,11 @@ function install_deps {
                 cp $PKG_PATH .
                 if [ $? -ne 0 ]; then
                     >&2 echo "  Here's what I have to work with..."
-                    >&2 echo "  TMPDIR=$TMP_DIR repoquery -c $YUM --repoid=$REPOID --arch=x86_64,noarch --resolve $PKG --qf=\"%{name} %{name}-%{version}-%{release}.%{arch}.rpm %{relativepath}\""
+                    >&2 echo "  TMPDIR=${TMP_DIR}"\
+                            "${REPOQUERY} --config=${YUM} --repoid=${REPOID}"\
+                            "${REPOQUERY_SUB_COMMAND} --arch=x86_64,noarch"\
+                            "--qf=\"%{name} %{name}-%{version}-%{release}.%{arch}.rpm %{relativepath}\""\
+                            "${REPOQUERY_RESOLVE} ${PKG}"
                     >&2 echo "  PKG=$PKG PKG_FILE=$PKG_FILE REPO_PATH=$REPO_PATH PKG_REL_PATH=$PKG_REL_PATH PKG_PATH=$PKG_PATH"
                 fi
 
@@ -172,8 +228,8 @@ function install_deps {
                     echo "  path $PKG_PATH" >> $BUILT_REPORT
                     FOUND_UNKNOWN=1
                 fi
-            done < $TMPFILE #<<< "$(TMPDIR=$TMP_DIR repoquery -c $YUM --repoid=$REPOID --arch=x86_64,noarch --resolve $TARGETS --qf=\"%{name} %{name}-%{version}-%{release}.%{arch}.rpm %{relativepath}\" | sort -r -V)"
-                        \rm -rf $TMP_DIR/yum-$USER-*
+            done < $TMPFILE
+            \rm -rf $TMP_DIR/yum-$USER-*
             TARGETS="$UNRESOLVED"
         fi
     done
@@ -220,6 +276,7 @@ OUTPUT_DIR=$MY_WORKSPACE/export
 TMP_DIR=$MY_WORKSPACE/tmp
 YUM=$OUTPUT_DIR/yum.conf
 DEPLISTFILE=$OUTPUT_DIR/deps.txt
+DEPLISTFILE_NEW=$OUTPUT_DIR/deps_new.txt
 DEPDETAILLISTFILE=$OUTPUT_DIR/deps_detail.txt
 
 BUILT_REPORT=$OUTPUT_DIR/local.txt
diff --git a/build-tools/build_minimal_iso/cgts_deps.sh b/build-tools/build_minimal_iso/cgts_deps.sh
index 062b74ff..9e4a88b2 100755
--- a/build-tools/build_minimal_iso/cgts_deps.sh
+++ b/build-tools/build_minimal_iso/cgts_deps.sh
@@ -1,40 +1,71 @@
 #!/bin/env bash
+
+#
+# Copyright (c) 2018-2020 Wind River Systems, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+CGTS_DEPS_DIR="$(dirname "$(readlink -f "${BASH_SOURCE[0]}" )" )"
+
+# Set REPOQUERY, REPOQUERY_SUB_COMMAND, REPOQUERY_RESOLVE and
+# REPOQUERY_WHATPROVIDES_DELIM for our build environment.
+source ${CGTS_DEPS_DIR}/../pkg-manager-utils.sh
+
 function generate_dep_list {
     TMP_RPM_DB=$(mktemp -d $(pwd)/tmp_rpm_db_XXXXXX)
     mkdir -p $TMP_RPM_DB
     rpm --initdb --dbpath $TMP_RPM_DB
-    rpm --dbpath $TMP_RPM_DB --test -Uvh --replacefiles '*.rpm' >> $DEPDETAILLISTFILE 2>&1
-    rpm --dbpath $TMP_RPM_DB --test -Uvh --replacefiles '*.rpm' 2>&1 \
-        | grep -v "error:" \
-        | grep -v "warning:" \
-        | grep -v "Preparing..." \
-        | sed "s/ is needed by.*$//" | sed "s/ >=.*$//" | sort -u > $DEPLISTFILE
-    rm -rf $TMP_RPM_DB
+    rpm --dbpath $TMP_RPM_DB --test -Uvh --replacefiles '*.rpm' > $DEPLISTFILE_NEW 2>&1
+    cat $DEPLISTFILE_NEW >> $DEPDETAILLISTFILE
+    cat $DEPLISTFILE_NEW \
+        | grep -v   -e "error:" -e "warning:" -e "Preparing..." \
+                    -e "Verifying..." -e "installing package" \
+        | sed -e "s/ is needed by.*$//" -e "s/ [<=>].*$//" \
+        | sort -u > $DEPLISTFILE
+    \rm -rf $TMP_RPM_DB
+}
+
+join_array() {
+    local IFS="$1"
+    shift
+    echo "$*"
 }
 
 function install_deps {
     local DEP_LIST=""
+    local DEP_LIST_ARRAY=()
     local DEP_LIST_FILE="$1"
 
     rm -f $TMPFILE
 
     while read DEP
     do
-        DEP_LIST="${DEP_LIST} ${DEP}"
+        DEP_LIST_ARRAY+=( "${DEP}" )
     done < $DEP_LIST_FILE
 
-    echo "Debug: List of deps to resolve: ${DEP_LIST}"
+    if [ "${REPOQUERY_WHATPROVIDES_DELIM}" != " " ]; then
+        DEP_LIST_ARRAY=( "$(join_array "${REPOQUERY_WHATPROVIDES_DELIM}" "${DEP_LIST_ARRAY[@]}" )" )
+    fi
 
-    if [ -z "${DEP_LIST}" ]; then
+    echo "Debug: List of deps to resolve: ${DEP_LIST_ARRAY[@]}"
+
+    if [ ${#DEP_LIST_ARRAY[@]} -gt 0 ]; then
         return 0
     fi
 
     # go through each repo and convert deps to packages
-
     for REPOID in `grep  '^[[].*[]]$' $YUM | grep -v '[[]main[]]' | awk -F '[][]' '{print $2 }'`; do
-        echo "TMPDIR=$TMP_DIR repoquery -c $YUM --repoid=$REPOID --arch=x86_64,noarch --whatprovides ${DEP_LIST} --qf='%{name}'"
-        TMPDIR=$TMP_DIR repoquery -c $YUM --repoid=$REPOID --arch=x86_64,noarch --qf='%{name}' --whatprovides ${DEP_LIST} | sed "s/kernel-debug/kernel/g" >> $TMPFILE
-                \rm -rf $TMP_DIR/yum-$USER-*
+        echo "TMPDIR=${TMP_DIR}"\
+             "${REPOQUERY} --config=${YUM} --repoid=${REPOID}"\
+             "${REPOQUERY_SUB_COMMAND} --arch=x86_64,noarch"\
+             "--qf='%{name}' --whatprovides ${DEP_LIST_ARRAY[@]}"
+        TMPDIR=${TMP_DIR} \
+            ${REPOQUERY} --config=${YUM} --repoid=${REPOID} \
+            ${REPOQUERY_SUB_COMMAND} --arch=x86_64,noarch \
+            --qf='%{name}' --whatprovides ${DEP_LIST_ARRAY[@]} \
+            | sed "s/kernel-debug/kernel/g" >> $TMPFILE
+        \rm -rf $TMP_DIR/yum-$USER-*
     done
     sort $TMPFILE -u > $TMPFILE1
     rm $TMPFILE
@@ -42,12 +73,12 @@ function install_deps {
     DEP_LIST=""
     while read DEP
     do
-        DEP_LIST="${DEP_LIST} ${DEP}"
+        DEP_LIST+="${DEP} "
     done < $TMPFILE1
     rm $TMPFILE1
 
     # next go through each repo and install packages
-    local TARGETS=${DEP_LIST}
+    local TARGETS="${DEP_LIST}"
     echo "Debug: Resolved list of deps to install: ${TARGETS}"
     local UNRESOLVED
     for REPOID in `grep  '^[[].*[]]$' $YUM | grep -v '[[]main[]]' | awk -F '[][]' '{print $2 }'`; do
@@ -55,9 +86,19 @@ function install_deps {
 
         if [[ ! -z "${TARGETS// }" ]]; then
             REPO_PATH=$(cat $YUM | sed -n "/^\[$REPOID\]\$/,\$p" | grep '^baseurl=' | head -n 1 | awk -F 'file://' '{print $2}' | sed 's:/$::')
-            >&2  echo "TMPDIR=$TMP_DIR repoquery -c $YUM --repoid=$REPOID --arch=x86_64,noarch --resolve $TARGETS --qf='%{name} %{name}-%{version}-%{release}.%{arch}.rpm %{relativepath}'"
-            TMPDIR=$TMP_DIR repoquery -c $YUM --repoid=$REPOID --arch=x86_64,noarch --resolve $TARGETS --qf="%{name} %{name}-%{version}-%{release}.%{arch}.rpm %{relativepath}" | sort -r -V >> $TMPFILE
-                        \rm -rf $TMP_DIR/yum-$USER-*
+            >&2 echo "TMPDIR=${TMP_DIR}"\
+                    "${REPOQUERY} --config=${YUM} --repoid=${REPOID}"\
+                    "${REPOQUERY_SUB_COMMAND} --arch=x86_64,noarch"\
+                    "--qf='%{name} %{name}-%{version}-%{release}.%{arch}.rpm %{relativepath}'"\
+                    "${REPOQUERY_RESOLVE} ${TARGETS}"
+            TMPDIR=${TMP_DIR} \
+                ${REPOQUERY} --config=${YUM} --repoid=${REPOID} \
+                ${REPOQUERY_SUB_COMMAND} --arch=x86_64,noarch \
+                --qf="%{name} %{name}-%{version}-%{release}.%{arch}.rpm %{relativepath}" \
+                ${REPOQUERY_RESOLVE} ${TARGETS} \
+                | sort -r -V >> $TMPFILE
+
+            \rm -rf $TMP_DIR/yum-$USER-*
 
             while read STR
             do
@@ -75,7 +116,11 @@ function install_deps {
                 cp $PKG_PATH .
                 if [ $? -ne 0 ]; then
                     >&2 echo "  Here's what I have to work with..."
-                    >&2 echo "  TMPDIR=$TMP_DIR repoquery -c $YUM --repoid=$REPOID --arch=x86_64,noarch --resolve $PKG --qf=\"%{name} %{name}-%{version}-%{release}.%{arch}.rpm %{relativepath}\""
+                    >&2 echo "  TMPDIR=${TMP_DIR}"\
+                            "${REPOQUERY} -c ${YUM} --repoid=${REPOID}"\
+                            "${REPOQUERY_SUB_COMMAND} --arch=x86_64,noarch"\
+                            "--qf=\"%{name} %{name}-%{version}-%{release}.%{arch}.rpm %{relativepath}\""\
+                            "${REPOQUERY_RESOLVE} ${PKG}"
                     >&2 echo "  PKG=$PKG PKG_FILE=$PKG_FILE REPO_PATH=$REPO_PATH PKG_REL_PATH=$PKG_REL_PATH PKG_PATH=$PKG_PATH"
                 fi
 
@@ -91,8 +136,9 @@ function install_deps {
                     echo "  path $PKG_PATH" >> $BUILT_REPORT
                     FOUND_UNKNOWN=1
                 fi
-            done < $TMPFILE #<<< "$(TMPDIR=$TMP_DIR repoquery -c $YUM --repoid=$REPOID --arch=x86_64,noarch --resolve $TARGETS --qf=\"%{name} %{name}-%{version}-%{release}.%{arch}.rpm %{relativepath}\" | sort -r -V)"
-                        \rm -rf $TMP_DIR/yum-$USER-*
+            done < $TMPFILE
+
+            \rm -rf $TMP_DIR/yum-$USER-*
             TARGETS="$UNRESOLVED"
         fi
     done
@@ -143,6 +189,7 @@ OUTPUT_DIR=${ROOT}/newDisk
 YUM=${ROOT}/yum.conf
 TMP_DIR=${ROOT}/tmp
 DEPLISTFILE=${ROOT}/deps.txt
+DEPLISTFILE_NEW=${ROOT}/deps_new.txt
 DEPDETAILLISTFILE=${ROOT}/deps_detail.txt
 INSTALLDIR=${ROOT}/newDisk/isolinux/Packages
 
diff --git a/build-tools/default_build_srpm b/build-tools/default_build_srpm
index e74b3661..fe99ad6c 100755
--- a/build-tools/default_build_srpm
+++ b/build-tools/default_build_srpm
@@ -1,6 +1,12 @@
 #!/bin/bash
 # set -x
 
+#
+# Copyright (c) 2018-2020 Wind River Systems, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
 source "$SRC_BASE/build-tools/spec-utils"
 source "$SRC_BASE/build-tools/srpm-utils"
 
@@ -195,14 +201,14 @@ fi
 
 if [ $TAR_NEEDED -gt 0 ]; then
     echo "Creating tar file: $TAR_PATH ..."
-    echo "tar czf  $TAR_PATH $SRC_DIR --exclude '.git*' --exclude 'build' --exclude='.pc' --exclude='patches' --exclude='$SRC_DIR/$DISTRO' --exclude='pbr-*.egg' --transform 's,^$TRANSFORM,$TAR_NAME-$VERSION,'"
-    tar czf  $TAR_PATH $SRC_DIR --exclude '.git*' --exclude 'build' --exclude='.pc' --exclude='patches' --exclude="$SRC_DIR/$DISTRO" --exclude='pbr-*.egg' --transform "s,^$TRANSFORM,$TAR_NAME-$VERSION,"
+    echo "tar --exclude '.git*' --exclude 'build' --exclude='.pc' --exclude='patches' --exclude='$SRC_DIR/$DISTRO' --exclude='pbr-*.egg' --transform 's,^$TRANSFORM,$TAR_NAME-$VERSION,' -czf $TAR_PATH $SRC_DIR"
+    tar --exclude '.git*' --exclude 'build' --exclude='.pc' --exclude='patches' --exclude="$SRC_DIR/$DISTRO" --exclude='pbr-*.egg' --transform "s,^$TRANSFORM,$TAR_NAME-$VERSION," -czf "$TAR_PATH" "$SRC_DIR"
     if [ $? -ne 0 ]; then
 		if [ "x$STAGING" != "x" ]; then
 			popd
 		fi
     
-        echo "ERROR: default_build_srpm (${LINENO}): failed to create tar file, cmd: tar czf  $TAR_PATH $SRC_DIR --exclude '.git*' --exclude 'build' --exclude='.pc' --exclude='patches' --exclude="$SRC_DIR/$DISTRO" --exclude='pbr-*.egg' --transform \"s,^$TRANSFORM,$TAR_NAME-$VERSION,\""
+        echo "ERROR: default_build_srpm (${LINENO}): failed to create tar file, cmd: tar --exclude '.git*' --exclude 'build' --exclude='.pc' --exclude='patches' --exclude="$SRC_DIR/$DISTRO" --exclude='pbr-*.egg' --transform \"s,^$TRANSFORM,$TAR_NAME-$VERSION,\" -czf '$TAR_PATH' '$SRC_DIR'"
         exit 1
     fi
     echo "Created tar file: $TAR_PATH"
diff --git a/build-tools/mockchain-parallel b/build-tools/mockchain-parallel
index 8645d30f..73029df6 100755
--- a/build-tools/mockchain-parallel
+++ b/build-tools/mockchain-parallel
@@ -24,10 +24,16 @@ interpreter_path () {
 
 get__version__ () {
     local path=${1}
+    local var=""
     if [ ! -f ${path} ]; then
         return 1
     fi
-    grep __VERSION__= ${path} | cut -d '=' -f 2 | sed 's/"//g'
+    if file ${path} | grep -q 'Python script'; then
+        ver=$(grep __VERSION__= ${path} | cut -d '=' -f 2 | sed 's/"//g')
+    else
+        ver=$(${path} --version 2> /dev/null)
+    fi
+    echo $ver
 }
 
 VC_LESS_THAN=0
diff --git a/build-tools/mockchain-parallel-2.6 b/build-tools/mockchain-parallel-2.6
new file mode 100755
index 00000000..c159d9bf
--- /dev/null
+++ b/build-tools/mockchain-parallel-2.6
@@ -0,0 +1,1221 @@
+#!/usr/bin/python3 -tt
+# -*- coding: utf-8 -*-
+# vim: noai:ts=4:sw=4:expandtab
+
+# by skvidal@fedoraproject.org
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Library General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA.
+# copyright 2012 Red Hat, Inc.
+
+# SUMMARY
+# mockchain
+# take a mock config and a series of srpms
+# rebuild them one at a time
+# adding each to a local repo
+# so they are available as build deps to next pkg being built
+from __future__ import print_function
+
+import cgi
+# pylint: disable=deprecated-module
+import optparse
+import os
+import re
+import shutil
+import subprocess
+import sys
+import tempfile
+import time
+import multiprocessing
+import signal
+import psutil
+
+import requests
+# pylint: disable=import-error
+from six.moves.urllib_parse import urlsplit
+
+import mockbuild.util
+
+from stxRpmUtils import splitRpmFilename
+
+# all of the variables below are substituted by the build system
+__VERSION__="2.6"
+SYSCONFDIR="/etc"
+PYTHONDIR="/usr/lib/python3.6/site-packages"
+PKGPYTHONDIR="/usr/lib/python3.6/site-packages/mockbuild"
+MOCKCONFDIR = os.path.join(SYSCONFDIR, "mock")
+# end build system subs
+
+mockconfig_path = '/etc/mock'
+
+def rpmName(path):
+    filename = os.path.basename(path)
+    (n, v, r, e, a) = splitRpmFilename(filename)
+    return n
+
+def createrepo(path):
+    global max_workers
+    if os.path.exists(path + '/repodata/repomd.xml'):
+        comm = ['/usr/bin/createrepo_c', '--update', '--retain-old-md', "%d" % max_workers, "--workers", "%d" % max_workers, path]
+    else:
+        comm = ['/usr/bin/createrepo_c', "--workers", "%d" % max_workers, path]
+    cmd = subprocess.Popen(
+        comm, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    out, err = cmd.communicate()
+    return out, err
+
+
+g_opts = optparse.Values()
+
+def parse_args(args):
+    parser = optparse.OptionParser('\nmockchain -r mockcfg pkg1 [pkg2] [pkg3]')
+    parser.add_option(
+        '-r', '--root', default=None, dest='chroot',
+        metavar="CONFIG",
+        help="chroot config name/base to use in the mock build")
+    parser.add_option(
+        '-l', '--localrepo', default=None,
+        help="local path for the local repo, defaults to making its own")
+    parser.add_option(
+        '-c', '--continue', default=False, action='store_true',
+        dest='cont',
+        help="if a pkg fails to build, continue to the next one")
+    parser.add_option(
+        '-a', '--addrepo', default=[], action='append',
+        dest='repos',
+        help="add these repo baseurls to the chroot's yum config")
+    parser.add_option(
+        '--recurse', default=False, action='store_true',
+        help="if more than one pkg and it fails to build, try to build the rest and come back to it")
+    parser.add_option(
+        '--log', default=None, dest='logfile',
+        help="log to the file named by this option, defaults to not logging")
+    parser.add_option(
+        '--workers', default=1, dest='max_workers',
+        help="number of parallel build jobs")
+    parser.add_option(
+        '--worker-resources', default="", dest='worker_resources',
+        help="colon seperated list, how much mem in gb for each workers temfs")
+    parser.add_option(
+        '--basedir', default='/var/lib/mock', dest='basedir',
+        help="path to workspace")
+    parser.add_option(
+        '--tmp_prefix', default=None, dest='tmp_prefix',
+        help="tmp dir prefix - will default to username-pid if not specified")
+    parser.add_option(
+        '-m', '--mock-option', default=[], action='append',
+        dest='mock_option',
+        help="option to pass directly to mock")
+    parser.add_option(
+        '--mark-slow-name', default=[], action='append',
+        dest='slow_pkg_names_raw',
+        help="package name that is known to build slowly")
+    parser.add_option(
+        '--mark-slow-path', default=[], action='append',
+        dest='slow_pkgs_raw',
+        help="package path that is known to build slowly")
+    parser.add_option(
+        '--mark-big-name', default=[], action='append',
+        dest='big_pkg_names_raw',
+        help="package name that is known to require a lot of disk space to build")
+    parser.add_option(
+        '--mark-big-path', default=[], action='append',
+        dest='big_pkgs_raw',
+        help="package path that is known to require a lot of disk space to build")
+    parser.add_option(
+        '--srpm-dependency-file', default=None,
+        dest='srpm_dependency_file',
+        help="path to srpm dependency file")
+    parser.add_option(
+        '--rpm-dependency-file', default=None,
+        dest='rpm_dependency_file',
+        help="path to rpm dependency file")
+    parser.add_option(
+        '--rpm-to-srpm-map-file', default=None,
+        dest='rpm_to_srpm_map_file',
+        help="path to rpm to srpm map file")
+
+    opts, args = parser.parse_args(args)
+    if opts.recurse:
+        opts.cont = True
+
+    if not opts.chroot:
+        print("You must provide an argument to -r for the mock chroot")
+        sys.exit(1)
+
+    if len(sys.argv) < 3:
+        print("You must specify at least 1 package to build")
+        sys.exit(1)
+
+    return opts, args
+
+
+REPOS_ID = []
+
+slow_pkg_names={}
+slow_pkgs={}
+big_pkg_names={}
+big_pkgs={}
+
+def generate_repo_id(baseurl):
+    """ generate repository id for yum.conf out of baseurl """
+    repoid = "/".join(baseurl.split('//')[1:]).replace('/', '_')
+    repoid = re.sub(r'[^a-zA-Z0-9_]', '', repoid)
+    suffix = ''
+    i = 1
+    while repoid + suffix in REPOS_ID:
+        suffix = str(i)
+        i += 1
+    repoid = repoid + suffix
+    REPOS_ID.append(repoid)
+    return repoid
+
+
+def set_build_idx(infile, destfile, build_idx, tmpfs_size_gb, opts):
+    # log(opts.logfile, "set_build_idx: infile=%s, destfile=%s, build_idx=%d, tmpfs_size_gb=%d" % (infile, destfile, build_idx, tmpfs_size_gb))
+
+    try:
+        with open(infile) as f:
+            code = compile(f.read(), infile, 'exec')
+        # pylint: disable=exec-used
+        exec(code)
+
+        config_opts['root'] = config_opts['root'].replace('b0', 'b{0}'.format(build_idx))
+        config_opts['rootdir'] = config_opts['rootdir'].replace('b0', 'b{0}'.format(build_idx))
+        config_opts['cache_topdir'] = config_opts['cache_topdir'].replace('b0', 'b{0}'.format(build_idx))
+        # log(opts.logfile, "set_build_idx: root=%s" % config_opts['root'])
+        # log(opts.logfile, "set_build_idx: cache_topdir=%s" % config_opts['cache_topdir'])
+        if tmpfs_size_gb > 0:
+            config_opts['plugin_conf']['tmpfs_enable'] = True
+            config_opts['plugin_conf']['tmpfs_opts'] = {}
+            config_opts['plugin_conf']['tmpfs_opts']['required_ram_mb'] = 1024
+            config_opts['plugin_conf']['tmpfs_opts']['max_fs_size'] = "%dg" % tmpfs_size_gb
+            config_opts['plugin_conf']['tmpfs_opts']['mode'] = '0755'
+            config_opts['plugin_conf']['tmpfs_opts']['keep_mounted'] = True
+            # log(opts.logfile, "set_build_idx: plugin_conf->tmpfs_enable=%s" % config_opts['plugin_conf']['tmpfs_enable'])
+            # log(opts.logfile, "set_build_idx: plugin_conf->tmpfs_opts->max_fs_size=%s" % config_opts['plugin_conf']['tmpfs_opts']['max_fs_size'])
+
+        with open(destfile, 'w') as br_dest:
+            for k, v in list(config_opts.items()):
+                br_dest.write("config_opts[%r] = %r\n" % (k, v))
+
+        try:
+            log(opts.logfile, "set_build_idx: os.makedirs %s" % config_opts['cache_topdir'])
+            if not os.path.isdir(config_opts['cache_topdir']):
+                os.makedirs(config_opts['cache_topdir'], exist_ok=True)
+        except (IOError, OSError):
+            return False, "Could not create dir: %s" % config_opts['cache_topdir']
+
+        cache_dir = "%s/%s/mock" % (config_opts['basedir'], config_opts['root'])
+        try:
+            log(opts.logfile, "set_build_idx: os.makedirs %s" % cache_dir)
+            if not os.path.isdir(cache_dir):
+                os.makedirs(cache_dir)
+        except (IOError, OSError):
+            return False, "Could not create dir: %s" % cache_dir
+
+        return True, ''
+    except (IOError, OSError):
+        return False, "Could not write mock config to %s" % destfile
+
+    return True, ''
+
+def set_basedir(infile, destfile, basedir, opts):
+    log(opts.logfile, "set_basedir: infile=%s, destfile=%s, basedir=%s" % (infile, destfile, basedir))
+    try:
+        with open(infile) as f:
+            code = compile(f.read(), infile, 'exec')
+        # pylint: disable=exec-used
+        exec(code)
+
+        config_opts['basedir'] = basedir
+        config_opts['resultdir'] = '{0}/result'.format(basedir)
+        config_opts['backup_base_dir'] = '{0}/backup'.format(basedir)
+        config_opts['root'] = 'mock/b0'
+        config_opts['cache_topdir'] = '{0}/cache/b0'.format(basedir)
+        config_opts['rootdir'] = '{0}/mock/b0/root'.format(basedir)
+
+        with open(destfile, 'w') as br_dest:
+            for k, v in list(config_opts.items()):
+                br_dest.write("config_opts[%r] = %r\n" % (k, v))
+        return True, ''
+    except (IOError, OSError):
+        return False, "Could not write mock config to %s" % destfile
+
+    return True, ''
+
+def add_local_repo(infile, destfile, baseurl, repoid=None):
+    """take a mock chroot config and add a repo to it's yum.conf
+       infile = mock chroot config file
+       destfile = where to save out the result
+       baseurl = baseurl of repo you wish to add"""
+    global config_opts
+
+    try:
+        with open(infile) as f:
+            code = compile(f.read(), infile, 'exec')
+        # pylint: disable=exec-used
+        exec(code)
+        if not repoid:
+            repoid = generate_repo_id(baseurl)
+        else:
+            REPOS_ID.append(repoid)
+        localyumrepo = """
+[%s]
+name=%s
+baseurl=%s
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+cost=1
+best=1
+""" % (repoid, baseurl, baseurl)
+
+        config_opts['yum.conf'] += localyumrepo
+        with open(destfile, 'w') as br_dest:
+            for k, v in list(config_opts.items()):
+                br_dest.write("config_opts[%r] = %r\n" % (k, v))
+        return True, ''
+    except (IOError, OSError):
+        return False, "Could not write mock config to %s" % destfile
+
+    return True, ''
+
+
+def do_build(opts, cfg, pkg):
+
+    # returns 0, cmd, out, err = failure
+    # returns 1, cmd, out, err  = success
+    # returns 2, None, None, None = already built
+
+    signal.signal(signal.SIGTERM, child_signal_handler)
+    signal.signal(signal.SIGINT, child_signal_handler)
+    signal.signal(signal.SIGHUP, child_signal_handler)
+    signal.signal(signal.SIGABRT, child_signal_handler)
+    s_pkg = os.path.basename(pkg)
+    pdn = s_pkg.replace('.src.rpm', '')
+    resdir = '%s/%s' % (opts.local_repo_dir, pdn)
+    resdir = os.path.normpath(resdir)
+    if not os.path.exists(resdir):
+        os.makedirs(resdir)
+
+    success_file = resdir + '/success'
+    fail_file = resdir + '/fail'
+
+    if os.path.exists(success_file):
+        # return 2, None, None, None
+        sys.exit(2)
+
+    # clean it up if we're starting over :)
+    if os.path.exists(fail_file):
+        os.unlink(fail_file)
+
+    if opts.uniqueext == '':
+        mockcmd = ['/usr/bin/mock',
+                   '--configdir', opts.config_path,
+                   '--resultdir', resdir,
+                   '--root', cfg, ]
+    else:
+        mockcmd = ['/usr/bin/mock',
+                   '--configdir', opts.config_path,
+                   '--resultdir', resdir,
+                   '--uniqueext', opts.uniqueext,
+                   '--root', cfg, ]
+
+    # Ensure repo is up-to-date.
+    # Note: Merely adding --update to mockcmd failed to update
+    mockcmd_update=mockcmd
+    mockcmd_update.append('--update')
+    cmd = subprocess.Popen(
+        mockcmd_update, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    out, err = cmd.communicate()
+    if cmd.returncode != 0:
+        if (isinstance(err, bytes)):
+            err = err.decode("utf-8")
+        sys.stderr.write(err)
+
+    # heuristic here, if user pass for mock "-d foo", but we must be care to leave
+    # "-d'foo bar'" or "--define='foo bar'" as is
+    compiled_re_1 = re.compile(r'^(-\S)\s+(.+)')
+    compiled_re_2 = re.compile(r'^(--[^ =])[ =](\.+)')
+    for option in opts.mock_option:
+        r_match = compiled_re_1.match(option)
+        if r_match:
+            mockcmd.extend([r_match.group(1), r_match.group(2)])
+        else:
+            r_match = compiled_re_2.match(option)
+            if r_match:
+                mockcmd.extend([r_match.group(1), r_match.group(2)])
+            else:
+                mockcmd.append(option)
+
+    print('building %s' % s_pkg)
+    mockcmd.append(pkg)
+    cmd = subprocess.Popen(
+        mockcmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    out, err = cmd.communicate()
+    if cmd.returncode == 0:
+        with open(success_file, 'w') as f:
+            f.write('done\n')
+        ret = 1
+    else:
+        if (isinstance(err, bytes)):
+            err = err.decode("utf-8")
+        sys.stderr.write(err)
+        with open(fail_file, 'w') as f:
+            f.write('undone\n')
+        ret = 0
+
+    # return ret, cmd, out, err
+    sys.exit(ret)
+
+
+def log(lf, msg):
+    if lf:
+        now = time.time()
+        try:
+            with open(lf, 'a') as f:
+                f.write(str(now) + ':' + msg + '\n')
+        except (IOError, OSError) as e:
+            print('Could not write to logfile %s - %s' % (lf, str(e)))
+    print(msg)
+
+
+config_opts = {}
+
+worker_data = []
+workers = 0
+max_workers = 1
+
+build_env = []
+
+failed = []
+built_pkgs = []
+
+local_repo_dir = ""
+
+pkg_to_name={}
+name_to_pkg={}
+srpm_dependencies_direct={}
+rpm_dependencies_direct={}
+rpm_to_srpm_map={}
+no_dep_list = [ "bash", "kernel" , "kernel-rt" ]
+
+
+def init_build_env(slots, opts, config_opts_in):
+    global build_env
+
+    orig_chroot_name=config_opts_in['chroot_name']
+    orig_mock_config = os.path.join(opts.config_path, "{0}.cfg".format(orig_chroot_name))
+    # build_env.append({'state': 'Idle', 'cfg': orig_mock_config})
+    for i in range(0,slots):
+        new_chroot_name = "{0}.b{1}".format(orig_chroot_name, i)
+        new_mock_config = os.path.join(opts.config_path, "{0}.cfg".format(new_chroot_name))
+        tmpfs_size_gb = 0
+        if opts.worker_resources == "":
+            if i > 0:
+                tmpfs_size_gb = 2 * (1 + slots - i)
+        else:
+            resource_array=opts.worker_resources.split(':')
+            if i < len(resource_array):
+                tmpfs_size_gb=int(resource_array[i])
+            else:
+                log(opts.logfile, "Error: worker-resources argument '%s' does not supply info for all %d workers" % (opts.worker_resources, slots))
+                sys.exit(1)
+        if i == 0 and tmpfs_size_gb != 0:
+            log(opts.logfile, "Error: worker-resources argument '%s' must pass '0' as first value" % (opts.worker_resources, slots))
+            sys.exit(1)
+        build_env.append({'state': 'Idle', 'cfg': new_mock_config, 'fs_size_gb': tmpfs_size_gb})
+
+        res, msg = set_build_idx(orig_mock_config, new_mock_config, i, tmpfs_size_gb, opts)
+        if not res:
+            log(opts.logfile, "Error: Could not write out local config: %s" % msg)
+            sys.exit(1)
+
+
+idle_build_env_last_awarded = 0
+def get_idle_build_env(slots):
+    global build_env
+    global idle_build_env_last_awarded
+    visited = 0
+
+    if slots < 1:
+        return -1
+
+    i = idle_build_env_last_awarded - 1
+    if i < 0 or i >= slots:
+        i = slots - 1
+
+    while visited < slots:
+        if build_env[i]['state'] == 'Idle':
+            build_env[i]['state'] = 'Busy'
+            idle_build_env_last_awarded = i
+            return i
+        visited = visited + 1
+        i = i - 1
+        if i < 0:
+            i = slots - 1
+    return -1
+
+def release_build_env(idx):
+    global build_env
+
+    build_env[idx]['state'] = 'Idle'
+
+def get_best_rc(a, b):
+    print("get_best_rc: a=%s" % str(a))
+    print("get_best_rc: b=%s" % str(b))
+    if (b == {}) and (a != {}):
+        return a
+    if (a == {}) and (b != {}):
+        return b
+
+    if (b['build_name'] is None) and (not a['build_name'] is None):
+        return a
+    if (a['build_name'] is None) and (not b['build_name'] is None):
+        return b
+
+    if a['unbuilt_deps'] < b['unbuilt_deps']:
+        return a
+    if b['unbuilt_deps'] < a['unbuilt_deps']:
+        return b
+
+    if a['depth'] < b['depth']:
+        return a
+    if b['depth'] < a['depth']:
+        return b
+
+    print("get_best_rc: uncertain %s vs %s" % (a,b))
+    return a
+
+unbuilt_dep_list_print=False
+def unbuilt_dep_list(name, unbuilt_pkg_names, depth, checked=None):
+    global srpm_dependencies_direct
+    global rpm_dependencies_direct
+    global rpm_to_srpm_map
+    global no_dep_list
+    global unbuilt_dep_list_print
+
+    first_iteration=False
+    unbuilt = []
+    if name in no_dep_list:
+        return unbuilt
+
+    if checked is None:
+        first_iteration=True
+        checked=[]
+
+    # Count unbuild dependencies
+    if first_iteration:
+        dependencies_direct=srpm_dependencies_direct
+    else:
+        dependencies_direct=rpm_dependencies_direct
+
+    if name in dependencies_direct:
+        for rdep in dependencies_direct[name]:
+            sdep='???'
+            if rdep in rpm_to_srpm_map:
+                sdep = rpm_to_srpm_map[rdep]
+            if rdep != name and sdep != name and not rdep in checked:
+                if (not first_iteration) and (sdep in no_dep_list):
+                    continue
+                checked.append(rdep)
+                if sdep in unbuilt_pkg_names:
+                    if not sdep in unbuilt:
+                        unbuilt.append(sdep)
+                if depth > 0:
+                    child_unbuilt = unbuilt_dep_list(rdep, unbuilt_pkg_names, depth-1, checked)
+                    for sub_sdep in child_unbuilt:
+                        if sub_sdep != name:
+                            if not sub_sdep in unbuilt:
+                                unbuilt.append(sub_sdep)
+
+    return unbuilt
+
+def can_build_at_idx(build_idx, name, opts):
+    global pkg_to_name
+    global name_to_pkg
+    global big_pkgs
+    global big_pkg_names
+    global slow_pkgs
+    global slow_pkg_names
+    global build_env
+
+    fs_size_gb = 0
+    size_gb = 0
+    speed = 0
+    pkg = name_to_pkg[name]
+    if name in big_pkg_names:
+        size_gb=big_pkg_names[name]
+    if pkg in big_pkgs:
+        size_gb=big_pkgs[pkg]
+    if name in slow_pkg_names:
+        speed=slow_pkg_names[name]
+    if pkg in slow_pkgs:
+        speed=slow_pkgs[pkg]
+    fs_size_gb = build_env[build_idx]['fs_size_gb']
+    return fs_size_gb == 0 or fs_size_gb >= size_gb
+
+def schedule(build_idx, pkgs, opts):
+    global worker_data
+    global pkg_to_name
+    global name_to_pkg
+    global big_pkgs
+    global big_pkg_names
+    global slow_pkgs
+    global slow_pkg_names
+
+    unbuilt_pkg_names=[]
+    building_pkg_names=[]
+    unprioritized_pkg_names=[]
+
+    for pkg in pkgs:
+        name = pkg_to_name[pkg]
+        unbuilt_pkg_names.append(name)
+        unprioritized_pkg_names.append(name)
+
+    prioritized_pkg_names=[]
+
+    for wd in worker_data:
+        pkg = wd['pkg']
+        if not pkg is None:
+            name = pkg_to_name[pkg]
+            building_pkg_names.append(name)
+
+    # log(opts.logfile, "schedule: build_idx=%d  start" % build_idx)
+    if len(big_pkg_names) or len(big_pkgs):
+        next_unprioritized_pkg_names = unprioritized_pkg_names[:]
+        for name in unprioritized_pkg_names:
+            pkg = name_to_pkg[name]
+            if name in big_pkg_names or pkg in big_pkgs:
+                prioritized_pkg_names.append(name)
+                next_unprioritized_pkg_names.remove(name)
+        unprioritized_pkg_names = next_unprioritized_pkg_names[:]
+
+    if len(slow_pkg_names) or len(slow_pkgs):
+        next_unprioritized_pkg_names = unprioritized_pkg_names[:]
+        for name in unprioritized_pkg_names:
+            pkg = name_to_pkg[name]
+            if name in slow_pkg_names or pkg in slow_pkgs:
+                if can_build_at_idx(build_idx, name, opts):
+                    prioritized_pkg_names.append(name)
+                    next_unprioritized_pkg_names.remove(name)
+        unprioritized_pkg_names = next_unprioritized_pkg_names[:]
+
+    for name in unprioritized_pkg_names:
+        if can_build_at_idx(build_idx, name, opts):
+            prioritized_pkg_names.append(name)
+
+    name_out = schedule2(build_idx, prioritized_pkg_names, unbuilt_pkg_names, building_pkg_names, opts)
+    if not name_out is None:
+        pkg_out = name_to_pkg[name_out]
+    else:
+        pkg_out = None
+        # log(opts.logfile, "schedule: failed to translate '%s' to a pkg" % name_out)
+    # log(opts.logfile, "schedule: build_idx=%d  end: out = %s -> %s" % (build_idx, str(name_out), str(pkg_out)))
+    return pkg_out
+
+
+def schedule2(build_idx, pkg_names, unbuilt_pkg_names, building_pkg_names, opts):
+    global pkg_to_name
+    global name_to_pkg
+    global no_dep_list
+
+    max_depth = 3
+
+    if len(pkg_names) == 0:
+        return None
+
+    unbuilt_deps={}
+    building_deps={}
+    for depth in range(max_depth,-1,-1):
+        unbuilt_deps[depth]={}
+        building_deps[depth]={}
+
+    for depth in range(max_depth,-1,-1):
+        checked=[]
+        reordered_pkg_names = pkg_names[:]
+        # for name in reordered_pkg_names:
+        while len(reordered_pkg_names):
+            name = reordered_pkg_names.pop(0)
+            if name in checked:
+                continue
+
+            # log(opts.logfile, "checked.append(%s)" % name)
+            checked.append(name)
+
+            pkg = name_to_pkg[name]
+            # log(opts.logfile, "schedule2: check '%s', depth %d" % (name, depth))
+            if not name in unbuilt_deps[depth]:
+                unbuilt_deps[depth][name] = unbuilt_dep_list(name, unbuilt_pkg_names, depth)
+            if not name in building_deps[depth]:
+                building_deps[depth][name] = unbuilt_dep_list(name, building_pkg_names, depth)
+            # log(opts.logfile, "schedule2: unbuilt deps for pkg=%s, depth=%d: %s" % (name, depth, unbuilt_deps[depth][name]))
+            # log(opts.logfile, "schedule2: building deps for pkg=%s, depth=%d: %s" % (name, depth, building_deps[depth][name]))
+            if len(unbuilt_deps[depth][name]) == 0 and len(building_deps[depth][name]) == 0:
+                if can_build_at_idx(build_idx, name, opts):
+                    log(opts.logfile, "schedule2: no unbuilt deps for '%s', searching at depth %d" % (name, depth))
+                    return name
+                else:
+                    # log(opts.logfile, "schedule2: Can't build '%s' on 'b%d'" % (name, build_idx))
+                    continue
+
+            if not name in unbuilt_deps[0]:
+                unbuilt_deps[0][name] = unbuilt_dep_list(name, unbuilt_pkg_names, 0)
+            if not name in building_deps[0]:
+                building_deps[0][name] = unbuilt_dep_list(name, building_pkg_names, 0)
+            # log(opts.logfile, "schedule2: unbuilt deps for pkg=%s, depth=%d: %s" % (name, 0, unbuilt_deps[0][name]))
+            # log(opts.logfile, "schedule2: building deps for pkg=%s, depth=%d: %s" % (name, 0, building_deps[0][name]))
+            if (len(building_deps[depth][name]) == 0 and len(unbuilt_deps[depth][name]) == 1 and unbuilt_deps[depth][name][0] in no_dep_list) or (len(unbuilt_deps[depth][name]) == 0 and len(building_deps[depth][name]) == 1 and building_deps[depth][name][0] in no_dep_list):
+                if len(unbuilt_deps[0][name]) == 0 and len(building_deps[0][name]) == 0:
+                    if can_build_at_idx(build_idx, name, opts):
+                        log(opts.logfile, "schedule2: no unbuilt deps for '%s' except for indirect kernel dep, searching at depth %d" % (name, depth))
+                        return name
+                    else:
+                        # log(opts.logfile, "schedule2: Can't build '%s' on 'b%d'" % (name, build_idx))
+                        continue
+
+            loop = False
+            for dep_name in unbuilt_deps[depth][name]:
+                if name == dep_name:
+                    continue
+
+                # log(opts.logfile, "name=%s depends on dep_name=%s, depth=%d" % (name, dep_name, depth))
+                if dep_name in checked:
+                    continue
+
+                # log(opts.logfile, "schedule2: check '%s' indirect" % dep_name)
+                if not dep_name in unbuilt_deps[depth]:
+                    unbuilt_deps[depth][dep_name] = unbuilt_dep_list(dep_name, unbuilt_pkg_names, depth)
+                if not dep_name in building_deps[depth]:
+                    building_deps[depth][dep_name] = unbuilt_dep_list(dep_name, building_pkg_names, depth)
+                # log(opts.logfile, "schedule2: deps: unbuilt deps for %s -> %s, depth=%d: %s" % (name, dep_name, depth, unbuilt_deps[depth][dep_name]))
+                # log(opts.logfile, "schedule2: deps: building deps for %s -> %s, depth=%d: %s" % (name, dep_name, depth, building_deps[depth][dep_name]))
+                if len(unbuilt_deps[depth][dep_name]) == 0 and len(building_deps[depth][dep_name]) == 0:
+                    if can_build_at_idx(build_idx, dep_name, opts):
+                        log(opts.logfile, "schedule2: deps: no unbuilt deps for '%s', working towards '%s', searching at depth %d" % (dep_name, name, depth))
+                        return dep_name
+
+                if not dep_name in unbuilt_deps[0]:
+                    unbuilt_deps[0][dep_name] = unbuilt_dep_list(dep_name, unbuilt_pkg_names, 0)
+                if not dep_name in building_deps[0]:
+                    building_deps[0][dep_name] = unbuilt_dep_list(dep_name, building_pkg_names, 0)
+                # log(opts.logfile, "schedule2: deps: unbuilt deps for %s -> %s, depth=%d: %s" % (name, dep_name, 0, unbuilt_deps[0][dep_name]))
+                # log(opts.logfile, "schedule2: deps: building deps for %s -> %s, depth=%d: %s" % (name, dep_name, 0, building_deps[0][dep_name]))
+                if (len(building_deps[depth][dep_name]) == 0 and len(unbuilt_deps[depth][dep_name]) == 1 and unbuilt_deps[depth][dep_name][0] in no_dep_list) or (len(unbuilt_deps[depth][dep_name]) == 0 and len(building_deps[depth][dep_name]) == 1 and building_deps[depth][dep_name][0] in no_dep_list):
+                    if len(unbuilt_deps[0][dep_name]) == 0 and len(building_deps[0][dep_name]) == 0:
+                        if can_build_at_idx(build_idx, dep_name, opts):
+                            log(opts.logfile, "schedule2: no unbuilt deps for '%s' except for indirect kernel dep, working towards '%s', searching at depth %d" % (dep_name, name, depth))
+                            return dep_name
+
+                if name in unbuilt_deps[0][dep_name]:
+                    loop = True
+                    # log(opts.logfile, "schedule2: loop detected: %s <-> %s" % (name, dep_name))
+
+            if loop and len(building_deps[depth][name]) == 0:
+                log(opts.logfile, "schedule2: loop detected, try to build '%s'" % name)
+                return name
+
+            for dep_name in unbuilt_deps[depth][name]:
+                if dep_name in reordered_pkg_names:
+                    # log(opts.logfile, "schedule2: promote %s to work toward %s" % (dep_name, name))
+                    reordered_pkg_names.remove(dep_name)
+                    reordered_pkg_names.insert(0,dep_name)
+
+    # log(opts.logfile, "schedule2: Nothing buildable at this time")
+    return None
+
+
+def read_deps(opts):
+    read_srpm_deps(opts)
+    read_rpm_deps(opts)
+    read_map_deps(opts)
+
+def read_srpm_deps(opts):
+    global srpm_dependencies_direct
+
+    if opts.srpm_dependency_file == None:
+        return
+
+    if not os.path.exists(opts.srpm_dependency_file):
+        log(opts.logfile, "File not found: %s" % opts.srpm_dependency_file)
+        sys.exit(1)
+
+    with open(opts.srpm_dependency_file) as f:
+        lines = f.readlines()
+        for line in lines:
+            (name,deps) = line.rstrip().split(';')
+            srpm_dependencies_direct[name]=deps.split(',')
+
+def read_rpm_deps(opts):
+    global rpm_dependencies_direct
+
+    if opts.rpm_dependency_file == None:
+        return
+
+    if not os.path.exists(opts.rpm_dependency_file):
+        log(opts.logfile, "File not found: %s" % opts.rpm_dependency_file)
+        sys.exit(1)
+
+    with open(opts.rpm_dependency_file) as f:
+        lines = f.readlines()
+        for line in lines:
+            (name,deps) = line.rstrip().split(';')
+            rpm_dependencies_direct[name]=deps.split(',')
+
+def read_map_deps(opts):
+    global rpm_to_srpm_map
+
+    if opts.rpm_to_srpm_map_file == None:
+        return
+
+    if not os.path.exists(opts.rpm_to_srpm_map_file):
+        log(opts.logfile, "File not found: %s" % opts.rpm_to_srpm_map_file)
+        sys.exit(1)
+
+    with open(opts.rpm_to_srpm_map_file) as f:
+        lines = f.readlines()
+        for line in lines:
+            (rpm,srpm) = line.rstrip().split(';')
+            rpm_to_srpm_map[rpm]=srpm
+
+
+def reaper(opts):
+    global built_pkgs
+    global failed
+    global worker_data
+    global workers
+
+    reaped = 0
+    need_createrepo = False
+    last_reaped = -1
+    while reaped > last_reaped:
+        last_reaped = reaped
+        for wd in worker_data:
+            p = wd['proc']
+            ret = p.exitcode
+            if ret is not None:
+                pkg = wd['pkg']
+                b = int(wd['build_index'])
+                p.join()
+                worker_data.remove(wd)
+                workers = workers - 1
+                reaped = reaped + 1
+                release_build_env(b)
+
+                log(opts.logfile, "End build on 'b%d': %s" % (b, pkg))
+
+                if ret == 0:
+                    failed.append(pkg)
+                    log(opts.logfile, "Error building %s on 'b%d'." % (os.path.basename(pkg), b))
+                    if opts.recurse and not stop_signal:
+                        log(opts.logfile, "Will try to build again (if some other package will succeed).")
+                    else:
+                        log(opts.logfile, "See logs/results in %s" % opts.local_repo_dir)
+                elif ret == 1:
+                    log(opts.logfile, "Success building %s on 'b%d'" % (os.path.basename(pkg), b))
+                    built_pkgs.append(pkg)
+                    need_createrepo = True
+                elif ret == 2:
+                    log(opts.logfile, "Skipping already built pkg %s" % os.path.basename(pkg))
+
+    if need_createrepo:
+        # createrepo with the new pkgs
+        err = createrepo(opts.local_repo_dir)[1]
+        if err.strip():
+            log(opts.logfile, "Error making local repo: %s" % opts.local_repo_dir)
+            log(opts.logfile, "Err: %s" % err)
+
+    return reaped
+
+stop_signal = False
+
+def on_terminate(proc):
+    print("process {} terminated with exit code {}".format(proc, proc.returncode))
+
+def kill_proc_and_descentents(parent, need_stop=False, verbose=False):
+    global g_opts
+
+    if need_stop:
+        if verbose:
+            log(g_opts.logfile, "Stop %d" % parent.pid)
+
+        try:
+            parent.send_signal(signal.SIGSTOP)
+        except:
+            # perhaps mock still running as root, give it a sec to drop pivledges and try again
+            time.sleep(1)
+            parent.send_signal(signal.SIGSTOP)
+
+    try:
+        children = parent.children(recursive=False)
+    except:
+        children = []
+
+    for p in children:
+        kill_proc_and_descentents(p, need_stop=True, verbose=verbose)
+
+    if verbose:
+        log(g_opts.logfile, "Terminate %d" % parent.pid)
+
+    # parent.send_signal(signal.SIGTERM)
+    try:
+        parent.terminate()
+    except:
+        # perhaps mock still running as root, give it a sec to drop pivledges and try again
+        time.sleep(1)
+        parent.terminate()
+
+    if need_stop:
+        if verbose:
+            log(g_opts.logfile, "Continue %d" % parent.pid)
+
+        parent.send_signal(signal.SIGCONT)
+
+
+def child_signal_handler(signum, frame):
+    global g_opts
+    my_pid = os.getpid()
+    # log(g_opts.logfile, "--------- child %d recieved signal %d" % (my_pid, signum))
+    p = psutil.Process(my_pid)
+    kill_proc_and_descentents(p)
+    try:
+        sys.exit(0)
+    except SystemExit as e:
+        os._exit(0)
+
+def signal_handler(signum, frame):
+    global g_opts
+    global stop_signal
+    global workers
+    global worker_data
+    stop_signal = True
+
+    # Signal processes to complete
+    log(g_opts.logfile, "recieved signal %d, Terminating children" % signum)
+    for wd in worker_data:
+        p = wd['proc']
+        ret = p.exitcode
+        if ret is None:
+            # log(g_opts.logfile, "terminate child %d" % p.pid)
+            p.terminate()
+        else:
+            log(g_opts.logfile, "child return code was %d" % ret)
+
+    # Wait for remaining processes to complete
+    log(g_opts.logfile, "===== wait for signaled jobs to complete =====")
+    while len(worker_data) > 0:
+        log(g_opts.logfile, "    remaining workers: %d" % workers)
+        reaped = reaper(g_opts)
+        if reaped == 0:
+            time.sleep(0.1)
+
+    try:
+        sys.exit(1)
+    except SystemExit as e:
+        os._exit(1)
+
+def main(args):
+    opts, args = parse_args(args)
+    # take mock config + list of pkgs
+
+    global g_opts
+    global stop_signal
+    global build_env
+    global worker_data
+    global workers
+    global max_workers
+
+    global slow_pkg_names
+    global slow_pkgs
+    global big_pkg_names
+    global big_pkgs
+    max_workers = int(opts.max_workers)
+
+    global failed
+    global built_pkgs
+
+    cfg = opts.chroot
+    pkgs = args[1:]
+
+    # transform slow/big package options into dictionaries
+    for line in opts.slow_pkg_names_raw:
+        speed,name = line.split(":")
+        if speed != "":
+            slow_pkg_names[name]=int(speed)
+    for line in opts.slow_pkgs_raw:
+        speed,pkg = line.split(":")
+        if speed != "":
+            slow_pkgs[pkg]=int(speed)
+    for line in opts.big_pkg_names_raw:
+        size_gb,name = line.split(":")
+        if size_gb != "":
+            big_pkg_names[name]=int(size_gb)
+    for line in opts.big_pkgs_raw:
+        size_gb,pkg = line.split(":")
+        if size_gb != "":
+            big_pkgs[pkg]=int(size_gb)
+
+    # Set up a mapping between pkg path and pkg name
+    global pkg_to_name
+    global name_to_pkg
+    for pkg in pkgs:
+        if not pkg.endswith('.rpm'):
+            log(opts.logfile, "%s doesn't appear to be an rpm - skipping" % pkg)
+            continue
+
+        try:
+            name = rpmName(pkg)
+        except OSError as e:
+            print("Could not parse rpm %s" % pkg)
+            sys.exit(1)
+
+        pkg_to_name[pkg] = name
+        name_to_pkg[name] = pkg
+
+    read_deps(opts)
+
+    global config_opts
+    config_opts = mockbuild.util.load_config(mockconfig_path, cfg, None, __VERSION__, PKGPYTHONDIR)
+
+    if not opts.tmp_prefix:
+        try:
+            opts.tmp_prefix = os.getlogin()
+        except OSError as e:
+            print("Could not find login name for tmp dir prefix add --tmp_prefix")
+            sys.exit(1)
+    pid = os.getpid()
+    opts.uniqueext = '%s-%s' % (opts.tmp_prefix, pid)
+
+    if opts.basedir != "/var/lib/mock":
+        opts.uniqueext = ''
+
+    # create a tempdir for our local info
+    if opts.localrepo:
+        local_tmp_dir = os.path.abspath(opts.localrepo)
+        if not os.path.exists(local_tmp_dir):
+            os.makedirs(local_tmp_dir)
+            os.chmod(local_tmp_dir, 0o755)
+    else:
+        pre = 'mock-chain-%s-' % opts.uniqueext
+        local_tmp_dir = tempfile.mkdtemp(prefix=pre, dir='/var/tmp')
+        os.chmod(local_tmp_dir, 0o755)
+
+    if opts.logfile:
+        opts.logfile = os.path.join(local_tmp_dir, opts.logfile)
+        if os.path.exists(opts.logfile):
+            os.unlink(opts.logfile)
+
+    log(opts.logfile, "starting logfile: %s" % opts.logfile)
+
+    opts.local_repo_dir = os.path.normpath(local_tmp_dir + '/results/' + config_opts['chroot_name'] + '/')
+
+    if not os.path.exists(opts.local_repo_dir):
+        os.makedirs(opts.local_repo_dir, mode=0o755)
+
+    local_baseurl = "file://%s" % opts.local_repo_dir
+    log(opts.logfile, "results dir: %s" % opts.local_repo_dir)
+    opts.config_path = os.path.normpath(local_tmp_dir + '/configs/' + config_opts['chroot_name'] + '/')
+
+    if not os.path.exists(opts.config_path):
+        os.makedirs(opts.config_path, mode=0o755)
+
+    log(opts.logfile, "config dir: %s" % opts.config_path)
+
+    my_mock_config = os.path.join(opts.config_path, "{0}.cfg".format(config_opts['chroot_name']))
+
+    # modify with localrepo
+    res, msg = add_local_repo(config_opts['config_file'], my_mock_config, local_baseurl, 'local_build_repo')
+    if not res:
+        log(opts.logfile, "Error: Could not write out local config: %s" % msg)
+        sys.exit(1)
+
+    for baseurl in opts.repos:
+        res, msg = add_local_repo(my_mock_config, my_mock_config, baseurl)
+        if not res:
+            log(opts.logfile, "Error: Could not add: %s to yum config in mock chroot: %s" % (baseurl, msg))
+            sys.exit(1)
+
+    res, msg = set_basedir(my_mock_config, my_mock_config, opts.basedir, opts)
+    if not res:
+        log(opts.logfile, "Error: Could not write out local config: %s" % msg)
+        sys.exit(1)
+
+    # these files needed from the mock.config dir to make mock run
+    for fn in ['site-defaults.cfg', 'logging.ini']:
+        pth = mockconfig_path + '/' + fn
+        shutil.copyfile(pth, opts.config_path + '/' + fn)
+
+    # createrepo on it
+    err = createrepo(opts.local_repo_dir)[1]
+    if err.strip():
+        log(opts.logfile, "Error making local repo: %s" % opts.local_repo_dir)
+        log(opts.logfile, "Err: %s" % err)
+        sys.exit(1)
+
+    init_build_env(max_workers, opts, config_opts)
+
+    download_dir = tempfile.mkdtemp()
+    downloaded_pkgs = {}
+    built_pkgs = []
+    try_again = True
+    to_be_built = pkgs
+    return_code = 0
+    num_of_tries = 0
+
+    g_opts = opts
+    signal.signal(signal.SIGTERM, signal_handler)
+    signal.signal(signal.SIGINT, signal_handler)
+    signal.signal(signal.SIGHUP, signal_handler)
+    signal.signal(signal.SIGABRT, signal_handler)
+
+    while try_again and not stop_signal:
+        num_of_tries += 1
+        failed = []
+
+        log(opts.logfile, "===== iteration %d start =====" % num_of_tries)
+
+        to_be_built_scheduled = to_be_built[:]
+
+        need_reap = False
+        while len(to_be_built_scheduled) > 0:
+            # Free up a worker
+            while need_reap or workers >= max_workers:
+                need_reap = False
+                reaped = reaper(opts)
+                if reaped == 0:
+                    time.sleep(0.1)
+
+            if workers < max_workers:
+                workers = workers + 1
+
+                b = get_idle_build_env(max_workers)
+                if b < 0:
+                    log(opts.logfile, "Failed to find idle build env for: %s" % pkg)
+                    workers = workers - 1
+                    need_reap = True
+                    continue
+
+                pkg = schedule(b, to_be_built_scheduled, opts)
+                if pkg is None:
+                    if workers <= 1:
+                        # Remember we have one build environmnet reserved, so can't test for zero workers
+                        log(opts.logfile, "failed to schedule from: %s" % to_be_built_scheduled)
+                        pkg = to_be_built_scheduled[0]
+                        log(opts.logfile, "All workers idle, forcing build of pkg=%s" % pkg)
+                    else:
+                        release_build_env(b)
+                        workers = workers - 1
+                        need_reap = True
+                        continue
+
+                to_be_built_scheduled.remove(pkg)
+
+                if not pkg.endswith('.rpm'):
+                    log(opts.logfile, "%s doesn't appear to be an rpm - skipping" % pkg)
+                    failed.append(pkg)
+                    release_build_env(b)
+                    need_reap = True
+                    continue
+
+                elif pkg.startswith('http://') or pkg.startswith('https://') or pkg.startswith('ftp://'):
+                    url = pkg
+                    try:
+                        log(opts.logfile, 'Fetching %s' % url)
+                        r = requests.get(url)
+                        # pylint: disable=no-member
+                        if r.status_code == requests.codes.ok:
+                            fn = urlsplit(r.url).path.rsplit('/', 1)[1]
+                            if 'content-disposition' in r.headers:
+                                _, params = cgi.parse_header(r.headers['content-disposition'])
+                                if 'filename' in params and params['filename']:
+                                    fn = params['filename']
+                            pkg = download_dir + '/' + fn
+                            with open(pkg, 'wb') as fd:
+                                for chunk in r.iter_content(4096):
+                                    fd.write(chunk)
+                    except Exception as e:
+                        log(opts.logfile, 'Error Downloading %s: %s' % (url, str(e)))
+                        failed.append(url)
+                        release_build_env(b)
+                        need_reap = True
+                        continue
+                    else:
+                        downloaded_pkgs[pkg] = url
+
+                log(opts.logfile, "Start build on 'b%d': %s" % (b, pkg))
+                # ret = do_build(opts, config_opts['chroot_name'], pkg)[0]
+                p = multiprocessing.Process(target=do_build, args=(opts, build_env[b]['cfg'], pkg))
+                worker_data.append({'proc': p, 'pkg': pkg, 'build_index': int(b)})
+                p.start()
+
+        # Wait for remaining processes to complete
+        log(opts.logfile, "===== wait for last jobs in iteration %d to complete =====" % num_of_tries)
+        while workers > 0:
+            reaped = reaper(opts)
+            if reaped == 0:
+                time.sleep(0.1)
+        log(opts.logfile, "===== iteration %d complete =====" % num_of_tries)
+
+        if failed and opts.recurse:
+            log(opts.logfile, "failed=%s" % failed)
+            log(opts.logfile, "to_be_built=%s" % to_be_built)
+            if len(failed) != len(to_be_built):
+                to_be_built = failed
+                try_again = True
+                log(opts.logfile, 'Some package succeeded, some failed.')
+                log(opts.logfile, 'Trying to rebuild %s failed pkgs, because --recurse is set.' % len(failed))
+            else:
+                if max_workers > 1:
+                    max_workers = 1
+                    to_be_built = failed
+                    try_again = True
+                    log(opts.logfile, 'Some package failed under parallel build.')
+                    log(opts.logfile, 'Trying to rebuild %s failed pkgs with single thread, because --recurse is set.' % len(failed))
+                else:
+                    log(opts.logfile, "")
+                    log(opts.logfile, "*** Build Failed ***")
+                    log(opts.logfile, "Tried %s times - following pkgs could not be successfully built:" % num_of_tries)
+                    log(opts.logfile, "*** Build Failed ***")
+                    for pkg in failed:
+                        msg = pkg
+                        if pkg in downloaded_pkgs:
+                            msg = downloaded_pkgs[pkg]
+                        log(opts.logfile, msg)
+                    log(opts.logfile, "")
+                    try_again = False
+        else:
+            try_again = False
+            if failed:
+                return_code = 2
+
+    # cleaning up our download dir
+    shutil.rmtree(download_dir, ignore_errors=True)
+
+    log(opts.logfile, "")
+    log(opts.logfile, "Results out to: %s" % opts.local_repo_dir)
+    log(opts.logfile, "")
+    log(opts.logfile, "Pkgs built: %s" % len(built_pkgs))
+    if built_pkgs:
+        if failed:
+            if len(built_pkgs):
+                log(opts.logfile, "Some packages successfully built in this order:")
+        else:
+            log(opts.logfile, "Packages successfully built in this order:")
+        for pkg in built_pkgs:
+            log(opts.logfile, pkg)
+    return return_code
+
+
+if __name__ == "__main__":
+    sys.exit(main(sys.argv))
diff --git a/build-tools/modify-build-cfg b/build-tools/modify-build-cfg
index b639f521..78658623 100755
--- a/build-tools/modify-build-cfg
+++ b/build-tools/modify-build-cfg
@@ -1,5 +1,11 @@
 #!/bin/sh
 
+#
+# Copyright (c) 2018-2020 Wind River Systems, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
 # This script modifies a mock configuration file (typically $MY_BUILD_CFG)
 # to add build time environment variables to the mock environment (things
 # like what branch we're building on, etc).
@@ -11,6 +17,11 @@
 # usage: modify-build-cfg [file.cfg] [<layer>]
 #
 
+MODIFY_BUILD_CFG_DIR="$(dirname "$(readlink -f "${BASH_SOURCE[0]}" )" )"
+
+# Set PKG_MANAGER for our build environment.
+source "${MODIFY_BUILD_CFG_DIR}/pkg-manager-utils.sh"
+
 LAYER=${2:-$LAYER}
 
 # For backward compatibility.  Old repo location or new?
@@ -23,6 +34,13 @@ if [ ! -d ${CENTOS_REPO} ]; then
     fi
 fi
 
+# Preferred python
+if rpm -q --whatprovides --quiet python3; then
+    PYTHON_PKG=python3
+else
+    PYTHON_PKG=python2
+fi
+
 # Try to find a layer specific mock.cfg.proto
 MOCK_CFG_PROTO="${CENTOS_REPO}/mock.cfg.${LAYER}.proto"
 echo "==== Try MOCK_CFG_PROTO=$MOCK_CFG_PROTO ===="
@@ -98,7 +116,7 @@ grep -q "config_opts\['environment'\]\['WRS_GIT_BRANCH'\]" $FILE || \
 grep -q "config_opts\['environment'\]\['CGCS_GIT_BRANCH'\]" $FILE || \
     echo "config_opts['environment']['CGCS_GIT_BRANCH']" >> $FILE
 
-if [ -z $FORMAL_BUILD ]; then 
+if [ -z $FORMAL_BUILD ]; then
     grep -q "config_opts\['macros'\]\['%_no_cgcs_license_check'\] = '1'" $FILE || \
 	echo "config_opts['macros']['%_no_cgcs_license_check'] = '1'" >> $FILE
 else
@@ -118,8 +136,21 @@ if [ "containers" == "$BUILD_TYPE" ]; then
     NETWORK_PKGS="bind-utils"
 fi
 
-grep -q "config_opts\['chroot_setup_cmd'\] = 'install @buildsys-build pigz lbzip2 yum $NETWORK_PKGS'" $FILE || \
-    echo "config_opts['chroot_setup_cmd'] = 'install @buildsys-build pigz lbzip2 yum $NETWORK_PKGS'" >> $FILE
+BUILD_PKGS=''
+if [ "${PKG_MANAGER}" == "yum" ]; then
+    BUILD_PKGS='@buildsys-build'
+elif [ "${PKG_MANAGER}" == "dnf" ]; then
+    # buildsys-build group was dropped when Centos-8 switched to dnf.
+    # We must list all the members plus a few new ones (fedpkg-minimal, epel-rpm-macros).
+    BUILD_PKGS='bash bzip2 coreutils cpio diffutils epel-release epel-rpm-macros fedpkg-minimal findutils gawk gcc gcc-c++ grep gzip info make patch redhat-rpm-config redhat-release rpm-build sed shadow-utils tar unzip util-linux which xz'
+fi
+
+STX_PKGS='pigz lbzip2 bash'
+
+PKGS="${BUILD_PKGS} ${STX_PKGS} ${PKG_MANAGER} ${PYTHON_PKG} ${NETWORK_PKGS}"
+
+grep -q "config_opts\['chroot_setup_cmd'\] = 'install ${PKGS}'" $FILE || \
+    echo "config_opts['chroot_setup_cmd'] = 'install ${PKGS}'" >> $FILE
 
 # Special case for containers.
 # rpmbuild_networking is required for invoking helm commands within mock
diff --git a/build-tools/pkg-manager-utils.sh b/build-tools/pkg-manager-utils.sh
new file mode 100755
index 00000000..17f4abc1
--- /dev/null
+++ b/build-tools/pkg-manager-utils.sh
@@ -0,0 +1,33 @@
+#
+# Copyright (c) 2020 Wind River Systems, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+#
+# BASH utilities to select package manager
+#
+# Currently just sets some environment variables
+#
+
+# Yum vs DNF compatibility
+YUM=$(which yum 2>> /dev/null)
+DNF=$(which dnf 2>> /dev/null)
+PKG_MANAGER=""
+REPOQUERY=$(which repoquery 2>> /dev/null)
+REPOQUERY_SUB_COMMAND=""
+REPOQUERY_RESOLVE="--resolve"
+REPOQUERY_WHATPROVIDES_DELIM=" "
+if [ ! -z ${DNF} ]; then
+    PKG_MANAGER="dnf"
+    REPOQUERY=${DNF}
+    REPOQUERY_SUB_COMMAND="repoquery --disable-modular-filtering"
+    REPOQUERY_RESOLVE=""
+    REPOQUERY_WHATPROVIDES_DELIM=","
+elif [ ! -z ${YUM} ]; then
+    PKG_MANAGER="yum"
+else
+    >&2 echo "ERROR: Couldn't find a supported package manager"
+    exit 1
+fi
+
diff --git a/build-tools/repo_files/mock.cfg.all.proto b/build-tools/repo_files/mock.cfg.all.proto
deleted file mode 100644
index 6ecaa2d2..00000000
--- a/build-tools/repo_files/mock.cfg.all.proto
+++ /dev/null
@@ -1,58 +0,0 @@
-config_opts['root'] = 'BUILD_ENV/mock'
-config_opts['target_arch'] = 'x86_64'
-config_opts['legal_host_arches'] = ('x86_64',)
-config_opts['chroot_setup_cmd'] = 'install @buildsys-build'
-config_opts['dist'] = 'el7'  # only useful for --resultdir variable subst
-config_opts['releasever'] = '7'
-config_opts['rpmbuild_networking'] = False
-
-
-config_opts['yum.conf'] = """
-[main]
-keepcache=1
-debuglevel=2
-reposdir=/dev/null
-logfile=/var/log/yum.log
-retries=20
-obsoletes=1
-gpgcheck=0
-assumeyes=1
-syslog_ident=mock
-syslog_device=
-
-# repos
-[local-std]
-name=local-std
-baseurl=LOCAL_BASE/MY_BUILD_DIR/std/rpmbuild/RPMS
-enabled=1
-skip_if_unavailable=1
-metadata_expire=0
-
-[local-rt]
-name=local-rt
-baseurl=LOCAL_BASE/MY_BUILD_DIR/rt/rpmbuild/RPMS
-enabled=1
-skip_if_unavailable=1
-metadata_expire=0
-
-[local-installer]
-name=local-installer
-baseurl=LOCAL_BASE/MY_BUILD_DIR/installer/rpmbuild/RPMS
-enabled=1
-skip_if_unavailable=1
-metadata_expire=0
-
-[StxCentos7Distro]
-name=Stx-Centos-7-Distro
-enabled=1
-baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/Binary
-failovermethod=priority
-exclude=kernel-devel libvirt-devel
-
-[StxCentos7Distro-rt]
-name=Stx-Centos-7-Distro-rt
-enabled=1
-baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/rt/Binary
-failovermethod=priority
-
-"""
diff --git a/build-tools/repo_files/mock.cfg.all.proto b/build-tools/repo_files/mock.cfg.all.proto
new file mode 120000
index 00000000..2ba14cf5
--- /dev/null
+++ b/build-tools/repo_files/mock.cfg.all.proto
@@ -0,0 +1 @@
+mock.cfg.centos7.all.proto
\ No newline at end of file
diff --git a/build-tools/repo_files/mock.cfg.centos7.all.proto b/build-tools/repo_files/mock.cfg.centos7.all.proto
new file mode 100644
index 00000000..6ecaa2d2
--- /dev/null
+++ b/build-tools/repo_files/mock.cfg.centos7.all.proto
@@ -0,0 +1,58 @@
+config_opts['root'] = 'BUILD_ENV/mock'
+config_opts['target_arch'] = 'x86_64'
+config_opts['legal_host_arches'] = ('x86_64',)
+config_opts['chroot_setup_cmd'] = 'install @buildsys-build'
+config_opts['dist'] = 'el7'  # only useful for --resultdir variable subst
+config_opts['releasever'] = '7'
+config_opts['rpmbuild_networking'] = False
+
+
+config_opts['yum.conf'] = """
+[main]
+keepcache=1
+debuglevel=2
+reposdir=/dev/null
+logfile=/var/log/yum.log
+retries=20
+obsoletes=1
+gpgcheck=0
+assumeyes=1
+syslog_ident=mock
+syslog_device=
+
+# repos
+[local-std]
+name=local-std
+baseurl=LOCAL_BASE/MY_BUILD_DIR/std/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[local-rt]
+name=local-rt
+baseurl=LOCAL_BASE/MY_BUILD_DIR/rt/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[local-installer]
+name=local-installer
+baseurl=LOCAL_BASE/MY_BUILD_DIR/installer/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[StxCentos7Distro]
+name=Stx-Centos-7-Distro
+enabled=1
+baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/Binary
+failovermethod=priority
+exclude=kernel-devel libvirt-devel
+
+[StxCentos7Distro-rt]
+name=Stx-Centos-7-Distro-rt
+enabled=1
+baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/rt/Binary
+failovermethod=priority
+
+"""
diff --git a/build-tools/repo_files/mock.cfg.centos7.distro.proto b/build-tools/repo_files/mock.cfg.centos7.distro.proto
new file mode 100644
index 00000000..6ecaa2d2
--- /dev/null
+++ b/build-tools/repo_files/mock.cfg.centos7.distro.proto
@@ -0,0 +1,58 @@
+config_opts['root'] = 'BUILD_ENV/mock'
+config_opts['target_arch'] = 'x86_64'
+config_opts['legal_host_arches'] = ('x86_64',)
+config_opts['chroot_setup_cmd'] = 'install @buildsys-build'
+config_opts['dist'] = 'el7'  # only useful for --resultdir variable subst
+config_opts['releasever'] = '7'
+config_opts['rpmbuild_networking'] = False
+
+
+config_opts['yum.conf'] = """
+[main]
+keepcache=1
+debuglevel=2
+reposdir=/dev/null
+logfile=/var/log/yum.log
+retries=20
+obsoletes=1
+gpgcheck=0
+assumeyes=1
+syslog_ident=mock
+syslog_device=
+
+# repos
+[local-std]
+name=local-std
+baseurl=LOCAL_BASE/MY_BUILD_DIR/std/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[local-rt]
+name=local-rt
+baseurl=LOCAL_BASE/MY_BUILD_DIR/rt/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[local-installer]
+name=local-installer
+baseurl=LOCAL_BASE/MY_BUILD_DIR/installer/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[StxCentos7Distro]
+name=Stx-Centos-7-Distro
+enabled=1
+baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/Binary
+failovermethod=priority
+exclude=kernel-devel libvirt-devel
+
+[StxCentos7Distro-rt]
+name=Stx-Centos-7-Distro-rt
+enabled=1
+baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/rt/Binary
+failovermethod=priority
+
+"""
diff --git a/build-tools/repo_files/mock.cfg.centos7.proto b/build-tools/repo_files/mock.cfg.centos7.proto
new file mode 100644
index 00000000..beeea32f
--- /dev/null
+++ b/build-tools/repo_files/mock.cfg.centos7.proto
@@ -0,0 +1,57 @@
+config_opts['root'] = 'BUILD_ENV/mock'
+config_opts['target_arch'] = 'x86_64'
+config_opts['legal_host_arches'] = ('x86_64',)
+config_opts['chroot_setup_cmd'] = 'install @buildsys-build'
+config_opts['dist'] = 'el7'  # only useful for --resultdir variable subst
+config_opts['releasever'] = '7'
+config_opts['rpmbuild_networking'] = False
+
+
+config_opts['yum.conf'] = """
+[main]
+keepcache=1
+debuglevel=2
+reposdir=/dev/null
+logfile=/var/log/yum.log
+retries=20
+obsoletes=1
+gpgcheck=0
+assumeyes=1
+syslog_ident=mock
+syslog_device=
+
+# repos
+[local-std]
+name=local-std
+baseurl=LOCAL_BASE/MY_BUILD_DIR/std/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[local-rt]
+name=local-rt
+baseurl=LOCAL_BASE/MY_BUILD_DIR/rt/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[local-installer]
+name=local-installer
+baseurl=LOCAL_BASE/MY_BUILD_DIR/installer/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[StxCentos7Distro]
+name=Stx-Centos-7-Distro
+enabled=1
+baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/Binary
+failovermethod=priority
+
+[StxCentos7Distro-rt]
+name=Stx-Centos-7-Distro-rt
+enabled=1
+baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/rt/Binary
+failovermethod=priority
+
+"""
diff --git a/build-tools/repo_files/mock.cfg.centos8.all.proto b/build-tools/repo_files/mock.cfg.centos8.all.proto
new file mode 100644
index 00000000..c5bb65da
--- /dev/null
+++ b/build-tools/repo_files/mock.cfg.centos8.all.proto
@@ -0,0 +1,63 @@
+config_opts['root'] = 'BUILD_ENV/mock'
+config_opts['target_arch'] = 'x86_64'
+config_opts['legal_host_arches'] = ('x86_64',)
+config_opts['chroot_setup_cmd'] = 'install bash bzip2 coreutils cpio diffutils epel-release epel-rpm-macros fedpkg-minimal findutils gawk gcc gcc-c++ grep gzip info make patch redhat-rpm-config redhat-release rpm-build sed shadow-utils tar unzip util-linux which xz'
+config_opts['dist'] = 'el8'  # only useful for --resultdir variable subst
+config_opts['releasever'] = '8'
+config_opts['package_manager'] = 'dnf'
+config_opts['use_bootstrap'] = False
+config_opts['use_bootstrap_image'] = False
+config_opts['rpmbuild_networking'] = False
+
+
+config_opts['yum.conf'] = """
+[main]
+keepcache=1
+debuglevel=2
+reposdir=/dev/null
+logfile=/var/log/yum.log
+retries=20
+obsoletes=1
+gpgcheck=0
+assumeyes=1
+syslog_ident=mock
+syslog_device=
+
+# repos
+[local-std]
+name=local-std
+baseurl=LOCAL_BASE/MY_BUILD_DIR/std/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[local-rt]
+name=local-rt
+baseurl=LOCAL_BASE/MY_BUILD_DIR/rt/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[local-installer]
+name=local-installer
+baseurl=LOCAL_BASE/MY_BUILD_DIR/installer/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[StxCentos8Distro]
+name=Stx-Centos-8-Distro
+enabled=1
+baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/Binary
+failovermethod=priority
+exclude=kernel-devel libvirt-devel
+module_hotfixes=1
+
+[StxCentos8Distro-rt]
+name=Stx-Centos-8-Distro-rt
+enabled=1
+baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/rt/Binary
+failovermethod=priority
+module_hotfixes=1
+
+"""
diff --git a/build-tools/repo_files/mock.cfg.centos8.distro.proto b/build-tools/repo_files/mock.cfg.centos8.distro.proto
new file mode 100644
index 00000000..c5bb65da
--- /dev/null
+++ b/build-tools/repo_files/mock.cfg.centos8.distro.proto
@@ -0,0 +1,63 @@
+config_opts['root'] = 'BUILD_ENV/mock'
+config_opts['target_arch'] = 'x86_64'
+config_opts['legal_host_arches'] = ('x86_64',)
+config_opts['chroot_setup_cmd'] = 'install bash bzip2 coreutils cpio diffutils epel-release epel-rpm-macros fedpkg-minimal findutils gawk gcc gcc-c++ grep gzip info make patch redhat-rpm-config redhat-release rpm-build sed shadow-utils tar unzip util-linux which xz'
+config_opts['dist'] = 'el8'  # only useful for --resultdir variable subst
+config_opts['releasever'] = '8'
+config_opts['package_manager'] = 'dnf'
+config_opts['use_bootstrap'] = False
+config_opts['use_bootstrap_image'] = False
+config_opts['rpmbuild_networking'] = False
+
+
+config_opts['yum.conf'] = """
+[main]
+keepcache=1
+debuglevel=2
+reposdir=/dev/null
+logfile=/var/log/yum.log
+retries=20
+obsoletes=1
+gpgcheck=0
+assumeyes=1
+syslog_ident=mock
+syslog_device=
+
+# repos
+[local-std]
+name=local-std
+baseurl=LOCAL_BASE/MY_BUILD_DIR/std/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[local-rt]
+name=local-rt
+baseurl=LOCAL_BASE/MY_BUILD_DIR/rt/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[local-installer]
+name=local-installer
+baseurl=LOCAL_BASE/MY_BUILD_DIR/installer/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[StxCentos8Distro]
+name=Stx-Centos-8-Distro
+enabled=1
+baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/Binary
+failovermethod=priority
+exclude=kernel-devel libvirt-devel
+module_hotfixes=1
+
+[StxCentos8Distro-rt]
+name=Stx-Centos-8-Distro-rt
+enabled=1
+baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/rt/Binary
+failovermethod=priority
+module_hotfixes=1
+
+"""
diff --git a/build-tools/repo_files/mock.cfg.centos8.proto b/build-tools/repo_files/mock.cfg.centos8.proto
new file mode 100644
index 00000000..08a041b2
--- /dev/null
+++ b/build-tools/repo_files/mock.cfg.centos8.proto
@@ -0,0 +1,62 @@
+config_opts['root'] = 'BUILD_ENV/mock'
+config_opts['target_arch'] = 'x86_64'
+config_opts['legal_host_arches'] = ('x86_64',)
+config_opts['chroot_setup_cmd'] = 'install bash bzip2 coreutils cpio diffutils epel-release epel-rpm-macros fedpkg-minimal findutils gawk gcc gcc-c++ grep gzip info make patch redhat-rpm-config redhat-release rpm-build sed shadow-utils tar unzip util-linux which xz'
+config_opts['dist'] = 'el8'  # only useful for --resultdir variable subst
+config_opts['releasever'] = '8'
+config_opts['package_manager'] = 'dnf'
+config_opts['use_bootstrap'] = False
+config_opts['use_bootstrap_image'] = False
+config_opts['rpmbuild_networking'] = False
+
+
+config_opts['yum.conf'] = """
+[main]
+keepcache=1
+debuglevel=2
+reposdir=/dev/null
+logfile=/var/log/yum.log
+retries=20
+obsoletes=1
+gpgcheck=0
+assumeyes=1
+syslog_ident=mock
+syslog_device=
+
+# repos
+[local-std]
+name=local-std
+baseurl=LOCAL_BASE/MY_BUILD_DIR/std/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[local-rt]
+name=local-rt
+baseurl=LOCAL_BASE/MY_BUILD_DIR/rt/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[local-installer]
+name=local-installer
+baseurl=LOCAL_BASE/MY_BUILD_DIR/installer/rpmbuild/RPMS
+enabled=1
+skip_if_unavailable=1
+metadata_expire=0
+
+[StxCentos8Distro]
+name=Stx-Centos-8-Distro
+enabled=1
+baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/Binary
+failovermethod=priority
+module_hotfixes=1
+
+[StxCentos8Distro-rt]
+name=Stx-Centos-8-Distro-rt
+enabled=1
+baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/rt/Binary
+failovermethod=priority
+module_hotfixes=1
+
+"""
diff --git a/build-tools/repo_files/mock.cfg.distro.proto b/build-tools/repo_files/mock.cfg.distro.proto
deleted file mode 100644
index 6ecaa2d2..00000000
--- a/build-tools/repo_files/mock.cfg.distro.proto
+++ /dev/null
@@ -1,58 +0,0 @@
-config_opts['root'] = 'BUILD_ENV/mock'
-config_opts['target_arch'] = 'x86_64'
-config_opts['legal_host_arches'] = ('x86_64',)
-config_opts['chroot_setup_cmd'] = 'install @buildsys-build'
-config_opts['dist'] = 'el7'  # only useful for --resultdir variable subst
-config_opts['releasever'] = '7'
-config_opts['rpmbuild_networking'] = False
-
-
-config_opts['yum.conf'] = """
-[main]
-keepcache=1
-debuglevel=2
-reposdir=/dev/null
-logfile=/var/log/yum.log
-retries=20
-obsoletes=1
-gpgcheck=0
-assumeyes=1
-syslog_ident=mock
-syslog_device=
-
-# repos
-[local-std]
-name=local-std
-baseurl=LOCAL_BASE/MY_BUILD_DIR/std/rpmbuild/RPMS
-enabled=1
-skip_if_unavailable=1
-metadata_expire=0
-
-[local-rt]
-name=local-rt
-baseurl=LOCAL_BASE/MY_BUILD_DIR/rt/rpmbuild/RPMS
-enabled=1
-skip_if_unavailable=1
-metadata_expire=0
-
-[local-installer]
-name=local-installer
-baseurl=LOCAL_BASE/MY_BUILD_DIR/installer/rpmbuild/RPMS
-enabled=1
-skip_if_unavailable=1
-metadata_expire=0
-
-[StxCentos7Distro]
-name=Stx-Centos-7-Distro
-enabled=1
-baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/Binary
-failovermethod=priority
-exclude=kernel-devel libvirt-devel
-
-[StxCentos7Distro-rt]
-name=Stx-Centos-7-Distro-rt
-enabled=1
-baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/rt/Binary
-failovermethod=priority
-
-"""
diff --git a/build-tools/repo_files/mock.cfg.distro.proto b/build-tools/repo_files/mock.cfg.distro.proto
new file mode 120000
index 00000000..add71c08
--- /dev/null
+++ b/build-tools/repo_files/mock.cfg.distro.proto
@@ -0,0 +1 @@
+mock.cfg.centos7.distro.proto
\ No newline at end of file
diff --git a/build-tools/repo_files/mock.cfg.proto b/build-tools/repo_files/mock.cfg.proto
deleted file mode 100644
index beeea32f..00000000
--- a/build-tools/repo_files/mock.cfg.proto
+++ /dev/null
@@ -1,57 +0,0 @@
-config_opts['root'] = 'BUILD_ENV/mock'
-config_opts['target_arch'] = 'x86_64'
-config_opts['legal_host_arches'] = ('x86_64',)
-config_opts['chroot_setup_cmd'] = 'install @buildsys-build'
-config_opts['dist'] = 'el7'  # only useful for --resultdir variable subst
-config_opts['releasever'] = '7'
-config_opts['rpmbuild_networking'] = False
-
-
-config_opts['yum.conf'] = """
-[main]
-keepcache=1
-debuglevel=2
-reposdir=/dev/null
-logfile=/var/log/yum.log
-retries=20
-obsoletes=1
-gpgcheck=0
-assumeyes=1
-syslog_ident=mock
-syslog_device=
-
-# repos
-[local-std]
-name=local-std
-baseurl=LOCAL_BASE/MY_BUILD_DIR/std/rpmbuild/RPMS
-enabled=1
-skip_if_unavailable=1
-metadata_expire=0
-
-[local-rt]
-name=local-rt
-baseurl=LOCAL_BASE/MY_BUILD_DIR/rt/rpmbuild/RPMS
-enabled=1
-skip_if_unavailable=1
-metadata_expire=0
-
-[local-installer]
-name=local-installer
-baseurl=LOCAL_BASE/MY_BUILD_DIR/installer/rpmbuild/RPMS
-enabled=1
-skip_if_unavailable=1
-metadata_expire=0
-
-[StxCentos7Distro]
-name=Stx-Centos-7-Distro
-enabled=1
-baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/Binary
-failovermethod=priority
-
-[StxCentos7Distro-rt]
-name=Stx-Centos-7-Distro-rt
-enabled=1
-baseurl=LOCAL_BASE/MY_REPO_DIR/centos-repo/rt/Binary
-failovermethod=priority
-
-"""
diff --git a/build-tools/repo_files/mock.cfg.proto b/build-tools/repo_files/mock.cfg.proto
new file mode 120000
index 00000000..55c2e026
--- /dev/null
+++ b/build-tools/repo_files/mock.cfg.proto
@@ -0,0 +1 @@
+mock.cfg.centos7.proto
\ No newline at end of file