#!/bin/bash
#
# Copyright (c) 2018-2020 Wind River Systems, Inc.
#
# SPDX-License-Identifier: Apache-2.0
#
# Utility for adding patches to an unpatched ISO
#

source "$(dirname $0)/image-utils.sh"

if [ -z "${MY_REPO}" ]; then
    echo "Required environment variable MY_REPO is not set"
    exit 1
fi

if [ -z "${MY_WORKSPACE}" ]; then
    echo "Required environment variable MY_WORKSPACE is not set"
    exit 1
fi

STX_DIR=${MY_REPO}/stx
SETUP_PATCH_REPO=${STX_DIR}/update/extras/scripts/setup_patch_repo.sh
if [ ! -x ${SETUP_PATCH_REPO} ]; then
    echo "Cannot find or execute ${SETUP_PATCH_REPO}"
    exit 1
fi

# Create temp dir if necessary
export TMPDIR="$MY_WORKSPACE/tmp"
mkdir -p $TMPDIR

REPO_UPGRADES_DIR=${STX_DIR}/metal/bsp-files/upgrades
RELEASE_INFO="$(get_release_info)"

if [ $? -ne 0 ]; then
   echo "ERROR: failed to find a release info file."
   exit 1
fi

PLATFORM_RELEASE=$(source $RELEASE_INFO && echo $PLATFORM_RELEASE)

function usage() {
    echo ""
    echo "Usage: "
    echo "   $(basename $0) -i <input bootimage.iso> -o <output bootimage.iso> [ -u ] <patch> ..."
    echo "        -i <file>: Specify input ISO file"
    echo "        -o <file>: Specify output ISO file"
    echo "        -u       : Update with upgrades files from ${REPO_UPGRADES_DIR}"
    echo ""
}

function extract_pkg_from_patch_repo() {
   local repodir=${BUILDDIR}/patches
   local pkgname=$1
   local pkgfile=$(repoquery --disablerepo=* --repofrompath local,${repodir} --enablerepo=local --location -q ${pkgname})
   if [ -z "${pkgfile}" ]; then
      return 1
   fi

   rpm2cpio ${pkgfile/file://} | cpio -idmv
   if [ $? -ne 0 ]; then
      echo "Failed to extract $pkgname files from ${pkgfile/file://}"
      exit 1
   fi
}

declare INPUT_ISO=
declare OUTPUT_ISO=
declare ORIG_PWD=$PWD
declare DO_UPGRADES=1

while getopts "i:o:u" opt; do
    case $opt in
        i)
            INPUT_ISO=$OPTARG
            ;;
        o)
            OUTPUT_ISO=$OPTARG
            ;;
        u)
            DO_UPGRADES=0
            ;;
        *)
            usage
            exit 1
            ;;
    esac
done

if [ -z "$INPUT_ISO" -o -z "$OUTPUT_ISO" ]; then
    usage
    exit 1
fi

if [ ! -f ${INPUT_ISO} ]; then
    echo "Input file does not exist: ${INPUT_ISO}"
    exit 1
fi

if [ -f ${OUTPUT_ISO} ]; then
    echo "Output file already exists: ${OUTPUT_ISO}"
    exit 1
fi

shift $((OPTIND-1))

if [ $# -le 0 ]; then
    usage
    exit
fi

for pf in $@; do
    if [ ! -f $pf ]; then
        echo "Patch file $pf does not exist"
        exit 1
    fi

    if [[ ! $pf =~ \.patch$ ]]; then
        echo "Specified file $pf does not have .patch extension"
        exit 1
    fi
done

declare MNTDIR=
declare BUILDDIR=
declare WORKDIR=

function check_requirements {
    local -a required_utils=(
        rsync
        mkisofs
        isohybrid
        implantisomd5
    )
    if [ $UID -ne 0 ]; then
        # If running as non-root user, additional utils are required
        required_utils+=(
            guestmount
            guestunmount
        )
    fi

    local -i missing=0

    for req in ${required_utils[@]}; do
        which ${req} >&/dev/null
        if [ $? -ne 0 ]; then
            echo "Unable to find required utility: ${req}" >&2
            let missing++
        fi
    done

    if [ ${missing} -gt 0 ]; then
        echo "One or more required utilities are missing. Aborting..." >&2
        exit 1
    fi
}

function mount_iso {
    if [ $UID -eq 0 ]; then
        # Mount the ISO
        mount -o loop ${INPUT_ISO} ${MNTDIR}
        if [ $? -ne 0 ]; then
            echo "Failed to mount ${INPUT_ISO}" >&2
            exit 1
        fi
    else
        # As non-root user, mount the ISO using guestmount
        guestmount -a ${INPUT_ISO} -m /dev/sda1 --ro ${MNTDIR}
        rc=$?
        if [ $rc -ne 0 ]; then
            # Add a retry
            echo "Call to guestmount failed with rc=$rc. Retrying once..."

            guestmount -a ${INPUT_ISO} -m /dev/sda1 --ro ${MNTDIR}
            rc=$?
            if [ $rc -ne 0 ]; then
                echo "Call to guestmount failed with rc=$rc. Aborting..."
                exit $rc
            fi
        fi
    fi
}

function unmount_iso {
    if [ $UID -eq 0 ]; then
        umount ${MNTDIR}
    else
        guestunmount ${MNTDIR}
    fi
    rmdir ${MNTDIR}
}

function cleanup() {
    if [ -n "$MNTDIR" -a -d "$MNTDIR" ]; then
        unmount_iso
    fi

    if [ -n "$BUILDDIR" -a -d "$BUILDDIR" ]; then
        \rm -rf $BUILDDIR
    fi

    if [ -n "$WORKDIR" -a -d "$WORKDIR" ]; then
        \rm -rf $WORKDIR
    fi
}

trap cleanup EXIT

MNTDIR=$(mktemp -d -p $PWD patchiso_mnt_XXXXXX)
if [ -z "${MNTDIR}" -o ! -d ${MNTDIR} ]; then
    echo "Failed to create mntdir. Aborting..."
    exit $rc
fi

BUILDDIR=$(mktemp -d -p $PWD patchiso_build_XXXXXX)
if [ -z "${BUILDDIR}" -o ! -d ${BUILDDIR} ]; then
    echo "Failed to create builddir. Aborting..."
    exit $rc
fi

# Mount the ISO
mount_iso

rsync -a ${MNTDIR}/ ${BUILDDIR}/
rc=$?
if [ $rc -ne 0 ]; then
    echo "Call to rsync ISO content. Aborting..."
    exit $rc
fi

unmount_iso

# Setup the patch repo
${SETUP_PATCH_REPO} -o ${BUILDDIR}/patches $@
rc=$?
if [ $rc -ne 0 ]; then
    echo "Call to $(basename ${SETUP_PATCH_REPO}) failed with rc=$rc. Aborting..."
    exit $rc
fi

# Look for components that need modification
#extract_pkg_from_patch_repo
WORKDIR=$(mktemp -d -p $PWD patchiso_work_XXXXXX)
if [ -z "${WORKDIR}" -o ! -d ${WORKDIR} ]; then
    echo "Failed to create workdir. Aborting..."
    exit $rc
fi

\cd ${WORKDIR}
\mkdir extract
\cd extract

# Changes to copied files here must also be reflected in build-iso

extract_pkg_from_patch_repo platform-kickstarts
if [ $? -eq 0 ]; then
    # Replace files
    \rm -f ${BUILDDIR}/*ks.cfg &&
    \cp --preserve=all var/www/pages/feed/rel-*/*.cfg ${BUILDDIR}/ &&
    \cp --preserve=all ${BUILDDIR}/controller_ks.cfg ${BUILDDIR}/ks.cfg
    if [ $? -ne 0 ]; then
        echo "Failed to copy extracted kickstarts"
        exit 1
    fi
fi
\cd ${WORKDIR}
\rm -rf extract

\mkdir extract
\cd extract
extract_pkg_from_patch_repo platform-kickstarts-pxeboot
if [ $? -eq 0 ]; then
    # Replace files
    \rm -f ${BUILDDIR}/var/pxeboot/pxeboot_controller.cfg \
        ${BUILDDIR}/var/pxeboot/pxeboot_smallsystem.cfg \
        ${BUILDDIR}/var/pxeboot/pxeboot_smallsystem_lowlatency.cfg &&
    \cp --preserve=all pxeboot/* ${BUILDDIR}/var/pxeboot/
    if [ $? -ne 0 ]; then
        echo "Failed to copy extracted pxeboot kickstarts"
        exit 1
    fi
fi
\cd ${WORKDIR}
\rm -rf extract

\mkdir extract
\cd extract
extract_pkg_from_patch_repo pxe-network-installer
if [ $? -eq 0 ]; then
    # Replace files
    \rm -f ${BUILDDIR}/pxeboot/pxelinux.0 \
        ${BUILDDIR}/pxeboot/menu.c32 \
        ${BUILDDIR}/pxeboot/chain.c32 &&
    \cp --preserve=all var/pxeboot/pxelinux.0 var/pxeboot/menu.c32 var/pxeboot/chain.c32 ${BUILDDIR}/pxeboot/
    if [ $? -ne 0 ]; then
        echo "Error: Could not copy all files from installer"
        exit 1
    fi

    \rm -f ${BUILDDIR}/LiveOS/squashfs.img &&
    \cp --preserve=all var/www/pages/feed/rel-*/LiveOS/squashfs.img ${BUILDDIR}/LiveOS/
    if [ $? -ne 0 ]; then
        echo "Error: Could not copy squashfs from LiveOS"
        exit 1
    fi

    # Replace vmlinuz and initrd.img with our own pre-built ones
    \rm -f \
        ${BUILDDIR}/vmlinuz \
        ${BUILDDIR}/images/pxeboot/vmlinuz \
        ${BUILDDIR}/initrd.img \
        ${BUILDDIR}/images/pxeboot/initrd.img &&
    \cp --preserve=all var/pxeboot/rel-*/installer-bzImage_1.0 \
        ${BUILDDIR}/vmlinuz &&
    \cp --preserve=all var/pxeboot/rel-*/installer-bzImage_1.0 \
        ${BUILDDIR}/images/pxeboot/vmlinuz &&
    \cp --preserve=all var/pxeboot/rel-*/installer-intel-x86-64-initrd_1.0 \
        ${BUILDDIR}/initrd.img &&
    \cp --preserve=all var/pxeboot/rel-*/installer-intel-x86-64-initrd_1.0 \
        ${BUILDDIR}/images/pxeboot/initrd.img
    if [ $? -ne 0 ]; then
        echo "Error: Failed to copy installer images"
        exit 1
    fi
fi
\cd ${WORKDIR}
\rm -rf extract

\mkdir extract
\cd extract
extract_pkg_from_patch_repo grub2-efi-x64-pxeboot
if [ $? -eq 0 ]; then
    # Replace files
    \rm -f ${BUILDDIR}/var/pxeboot/EFI/grubx64.efi &&
    \cp --preserve=all pxeboot/EFI/grubx64.efi ${BUILDDIR}/var/pxeboot/EFI/
    if [ $? -ne 0 ]; then
        echo "Error: Failed to copy grub2-efi-x64-pxeboot files"
        exit 1
    fi
fi
\cd ${WORKDIR}
\rm -rf extract

\mkdir extract
\cd extract
extract_pkg_from_patch_repo grub2-common
if [ $? -eq 0 ]; then
    # Replace files
    for f in usr/lib/grub/x86_64-efi/*; do
        f_base=$(basename $f)
        \rm -f ${BUILDDIR}/var/pxeboot/EFI/$f_base &&
        \cp --preserve=all ${f} ${BUILDDIR}/var/pxeboot/EFI/
        if [ $? -ne 0 ]; then
            echo "Error: Failed to copy grub2-common files"
            exit 1
        fi
    done
fi
\cd ${WORKDIR}
\rm -rf extract

\mkdir extract
\cd extract
extract_pkg_from_patch_repo grub2-efi-x64-modules
if [ $? -eq 0 ]; then
    # Replace files
    for f in usr/lib/grub/x86_64-efi/*; do
        f_base=$(basename $f)
        \rm -f ${BUILDDIR}/var/pxeboot/EFI/$f_base &&
        \cp --preserve=all ${f} ${BUILDDIR}/var/pxeboot/EFI/
        if [ $? -ne 0 ]; then
            echo "Error: Failed to copy grub2-efi-x64-modules files"
            exit 1
        fi
    done
fi
\cd ${WORKDIR}
\rm -rf extract

\cd ${ORIG_PWD}

if [ ${DO_UPGRADES} -eq 0 ]; then
    # Changes to copied files here must also be reflected in build-iso

    echo "Updating upgrade support files"
    ISO_UPGRADES_DIR="${BUILDDIR}/upgrades"
    \rm -rf ${ISO_UPGRADES_DIR}
    \mkdir ${ISO_UPGRADES_DIR}
    \cp ${REPO_UPGRADES_DIR}/* ${ISO_UPGRADES_DIR}
    sed -i "s/xxxSW_VERSIONxxx/${PLATFORM_RELEASE}/g" ${ISO_UPGRADES_DIR}/metadata.xml
    chmod +x ${ISO_UPGRADES_DIR}/*.sh
    # Write the version out (used in upgrade scripts - this is the same as SW_VERSION)
    echo "VERSION=$PLATFORM_RELEASE" > ${ISO_UPGRADES_DIR}/version
fi

# Rebuild the ISO
mkisofs -o ${OUTPUT_ISO} \
    -R -D -A 'oe_iso_boot' -V 'oe_iso_boot' \
    -quiet \
    -b isolinux.bin -c boot.cat -no-emul-boot \
    -boot-load-size 4 -boot-info-table \
    -eltorito-alt-boot \
    -e images/efiboot.img \
    -no-emul-boot \
    ${BUILDDIR}

isohybrid --uefi ${OUTPUT_ISO}
implantisomd5 ${OUTPUT_ISO}

# Sign the .iso with the developer private key
# Signing with the formal key is only to be done for customer release
# and is a manual step afterwards, as with the GA ISO
openssl dgst -sha256 \
    -sign ${MY_REPO}/build-tools/signing/dev-private-key.pem \
    -binary \
    -out ${OUTPUT_ISO/%.iso/.sig} \
    ${OUTPUT_ISO}
rc=$?
if [ $rc -ne 0 ]; then
    echo "Call to $(basename ${SETUP_PATCH_REPO}) failed with rc=$rc. Aborting..."
    exit $rc
fi

echo "Patched ISO: ${OUTPUT_ISO}"