#!/bin/bash -e
#
# SPDX-License-Identifier: Apache-2.0
#
# download RPMs/SRPMs from different sources.
# this script was originated by Brian Avery, and later updated by Yong Hu

set -o errexit
set -o nounset

# By default, we use "sudo" and we don't use a local yum.conf. These can
# be overridden via flags.

SUDOCMD="sudo -E"
RELEASEVER="--releasever=7"
YUMCONFOPT=""

DL_RPMS_DIR="$(dirname "$(readlink -f "${BASH_SOURCE[0]}" )" )"

source $DL_RPMS_DIR/utils.sh

usage() {
    echo "$0 [-n] [-c <yum.conf>] <rpms_list> <match_level> "
    echo ""
    echo "Options:"
    echo "  -n: Do not use sudo when performing operations"
    echo "  -c: Use an alternate yum.conf rather than the system file"
    echo "  -x: Clean log files only, do not run."
    echo "  rpm_list: a list of RPM files to be downloaded."
    echo "  match_level: value could be L1, L2 or L3:"
    echo "    L1: use name, major version and minor version:"
    echo "        vim-7.4.160-2.el7 to search vim-7.4.160-2.el7.src.rpm"
    echo "    L2: use name and major version:"
    echo "        using vim-7.4.160 to search vim-7.4.160-2.el7.src.rpm"
    echo "    L3: use name:"
    echo "        using vim to search vim-7.4.160-2.el7.src.rpm"
    echo "    K1: Use Koji rather than yum repos as a source."
    echo "        Koji has a longer retention period than epel mirrors."
    echo ""
    echo "Returns: 0 = All files downloaded successfully"
    echo "         1 = Some files could not be downloaded"
    echo "         2 = Bad arguements or other error"
    echo ""
}


CLEAN_LOGS_ONLY=0
dl_rc=0

# Permitted values of dl_source
dl_from_stx_mirror="stx_mirror"
dl_from_upstream="upstream"
dl_from_stx_then_upstream="$dl_from_stx_mirror $dl_from_upstream"
dl_from_upstream_then_stx="$dl_from_upstream $dl_from_stx_mirror"

# Download from what source?
#   dl_from_stx_mirror = StarlingX mirror only
#   dl_from_upstream   = Original upstream source only
#   dl_from_stx_then_upstream = Either source, STX prefered (default)"
#   dl_from_upstream_then_stx = Either source, UPSTREAM prefered"
dl_source="$dl_from_stx_then_upstream"
dl_flag=""

distro="centos"

MULTIPLE_DL_FLAG_ERROR_MSG="Error: Please use only one of: -s,-S,-u,-U"

multiple_dl_flag_check () {
    if [ "$dl_flag" != "" ]; then
        echo "$MULTIPLE_DL_FLAG_ERROR_MSG"
        usage
        exit 1
    fi
}

# Parse option flags
while getopts "c:nxD:sSuUh" o; do
    case "${o}" in
        n)
            # No-sudo
            SUDOCMD=""
            ;;
        x)
            # Clean only
            CLEAN_LOGS_ONLY=1
            ;;
        c)
            # Use an alternate yum.conf
            YUMCONFOPT="-c $OPTARG"
            grep -q "releasever=" $OPTARG && RELEASEVER="--$(grep releasever= ${OPTARG})"
            ;;
        D)
            distro="${OPTARG}"
            ;;

        s)
            # Download from StarlingX mirror only. Do not use upstream sources.
            multiple_dl_flag_check
            dl_source="$dl_from_stx_mirror"
            dl_flag="-s"
            ;;
        S)
            # Download from StarlingX mirror only. Do not use upstream sources.
            multiple_dl_flag_check
            dl_source="$dl_from_stx_then_upstream"
            dl_flag="-S"
            ;;
        u)
            # Download from upstream only. Do not use StarlingX mirror.
            multiple_dl_flag_check
            dl_source="$dl_from_upstream"
            dl_flag="-u"
            ;;
        U)
            # Download from upstream only. Do not use StarlingX mirror.
            multiple_dl_flag_check
            dl_source="$dl_from_upstream_then_stx"
            dl_flag="-U"
            ;;

        h)
            # Help
            usage
            exit 0
            ;;
        *)
            usage
            exit 2
            ;;
    esac
done
shift $((OPTIND-1))

if [ $# -lt 2 ]; then
    usage
    exit 2
fi

if [ "$1" == "" ]; then
    echo "Need to supply the rpm file list"
    exit 2;
else
    rpms_list=$1
    echo "using $rpms_list as the download name lists"
fi

match_level="L1"

if [ ! -z "$2" -a "$2" != " " ];then
    match_level=$2
fi

timestamp=$(date +%F_%H%M)
echo $timestamp

DESTDIR="output"
MDIR_SRC=$DESTDIR/stx-r1/CentOS/pike/Source
mkdir -p $MDIR_SRC
MDIR_BIN=$DESTDIR/stx-r1/CentOS/pike/Binary
mkdir -p $MDIR_BIN

LOGSDIR="logs"
from=$(get_from $rpms_list)
LOG="$LOGSDIR/${match_level}_failmoved_url_${from}.log"
MISSING_SRPMS="$LOGSDIR/${match_level}_srpms_missing_${from}.log"
MISSING_RPMS="$LOGSDIR/${match_level}_rpms_missing_${from}.log"
FOUND_SRPMS="$LOGSDIR/${match_level}_srpms_found_${from}.log"
FOUND_RPMS="$LOGSDIR/${match_level}_rpms_found_${from}.log"
cat /dev/null > $LOG
cat /dev/null > $MISSING_SRPMS
cat /dev/null > $MISSING_RPMS
cat /dev/null > $FOUND_SRPMS
cat /dev/null > $FOUND_RPMS


if [ $CLEAN_LOGS_ONLY -eq 1 ];then
    exit 0
fi

# Function to download different types of RPMs in different ways
download () {
    local _file=$1
    local _level=$2
    local _list=""
    local _from=""

    local _arch=""

    local rc=0
    local download_cmd=""
    local download_url=""
    local rpm_name=""
    local SFILE=""
    local lvl
    local dl_result

    _list=$(cat $_file)
    _from=$(get_from $_file)

    echo "now the rpm will come from: $_from"
    for ff in $_list; do
        _arch=$(get_arch_from_rpm $ff)
        rpm_name="$(get_rpm_name $ff)"
        dest_dir="$(get_dest_directory $_arch)"

        if [ ! -e $dest_dir/$rpm_name ]; then
            dl_result=1
            for dl_src in $dl_source; do
                case $dl_src in
                    $dl_from_stx_mirror)
                        lvl=$dl_from_stx_mirror
                        ;;
                    $dl_from_upstream)
                        lvl=$_level
                        ;;
                    *)
                        echo "Error: Unknown dl_source '$dl_src'"
                        continue
                        ;;
                esac

                download_cmd="$(get_download_cmd $ff $lvl)"

                echo "Looking for $rpm_name"
                echo "--> run: $download_cmd"
                if $download_cmd ; then
                    download_url="$(get_url $ff $lvl)"
                    SFILE="$(get_rpm_level_name $rpm_name $lvl)"
                    process_result "$_arch" "$dest_dir" "$download_url" "$SFILE"
                    dl_result=0
                    break
                else
                    echo "Warning: $rpm_name not found"
                fi
            done

            if [ $dl_result -eq 1 ]; then
                echo "Error: $rpm_name not found"
                echo "missing_srpm:$rpm_name" >> $LOG
                echo $rpm_name >> $MISSING_SRPMS
                rc=1
            fi
        else
            echo "Already have $dest_dir/$rpm_name"
        fi
        echo
    done

    return $rc
}


# Prime the cache
loop_count=0
max_loop_count=5
echo "${SUDOCMD} yum ${YUMCONFOPT} ${RELEASEVER} makecache"
while ! ${SUDOCMD} yum ${YUMCONFOPT} ${RELEASEVER} makecache ; do
    # To protect against intermittent 404 errors, we'll retry
    # a few times.  The suspected issue is pulling repodata
    # from multiple source that are temporarily inconsistent.
    loop_count=$((loop_count + 1))
    if [ $loop_count -gt $max_loop_count ]; then
        break
    fi
    echo "makecache retry: $loop_count"

    # Wipe the inconsistent data from the last try
    echo "yum ${YUMCONFOPT} ${RELEASEVER} clean all"
    yum ${YUMCONFOPT} ${RELEASEVER} clean all
done


# Download files
if [ -s "$rpms_list" ];then
    echo "--> start searching $rpms_list"
    download $rpms_list $match_level
    if [ $? -ne 0 ]; then
        dl_rc=1
    fi
fi

echo "Done!"

exit $dl_rc