zipl.wrapper

zipl.wrapper

#!/bin/bash -x

tools_dir=/usr/lib/s390-tools

if [[ -e /run/bootc/mounts/rootfs/boot ]]; then
    mount --bind /run/bootc/mounts/rootfs/boot /boot
elif [[ -e /run/osbuild/mounts ]]; then
    mount --bind /run/osbuild/mounts/boot /boot
    mkdir /run/osbuild/mounts/s390-tools
    mount --bind /usr/lib/s390-tools /run/osbuild/mounts/s390-tools
    mount -o remount,rw /run/osbuild/mounts/s390-tools
    tools_dir=/run/osbuild/mounts/s390-tools
fi

cat <<'END' > "$tools_dir/zipl_helper.blkext"
#!/bin/bash -x

case "$1" in
    *:*) devno=$1 ;;
    *)   devno=$(findmnt -r -n -o MAJ:MIN --target "$1" | tail -n1) ;;
esac

if [[ -z "$devno" ]]; then
    echo "$0: devno major:minor is not specified" 1>&2
    exit 1
fi

sysdev_path="/sys/dev/block/$devno"

if [[ ! -e "$sysdev_path" ]]; then
    echo "$0: device not found: $sysdev_path" 1>&2
    exit 1    
fi

if [[ ! -e "$sysdev_path/partition" ]]; then
    echo "$0: not a partition: $sysdev_path" 1>&2
    exit 1    
fi

link_path=$(readlink "$sysdev_path")

if [[ -z "$link_path" ]]; then
    echo "$0: failed to read a symlink: $sysdev_path" 1>&2
    exit 1
fi

parent_path=$(dirname "$link_path")

if [[ -z "$parent_path" ]]; then
    echo "$0: failed to identify whole disk device: $link_path" 1>&2
    exit 1
fi

parent_name=$(basename "$parent_path")

if [[ -z "$parent_name" ]]; then
    echo "$0: failed to identify whole disk device name: $parent_path" 1>&2
    exit 1
fi

parent_sysblock_path="/sys/block/$parent_name"

if [[ ! -e "$parent_sysblock_path" ]]; then
    echo "$0: whole disk device not found: $parent_sysblock_path" 1>&2
    exit 1
fi

if [[ ! -e "$parent_sysblock_path/loop" ]]; then
    echo "$0: not a loop device: $parent_sysblock_path" 1>&2
    exit 1
fi

parent_dev_path="/dev/$parent_name"

if [[ ! -e "$parent_dev_path" ]]; then
    echo "$0: not found: $parent_dev_path" 1>&2
    exit 1
fi

dev_name=$(lsblk -J "$parent_dev_path" | jq -r --arg devno "$devno" '.blockdevices[0].children[] | select(.["maj:min"]==$devno) | .name')
offset=$(sfdisk -J "$parent_dev_path"| jq -r --arg part "/dev/$dev_name" '.partitiontable.partitions[] | select(.node==$part) | .start')

echo "targetbase=$parent_dev_path"
echo "targettype=scsi"
echo "targetblocksize=512"
echo "targetoffset=$offset"
END

chmod 755 "$tools_dir/zipl_helper.blkext"

/usr/sbin/zipl.bin "$@"
rc=$?

rm -f "$tools_dir/zipl_helper.blkext"

if [[ -e /run/osbuild/mounts/s390-tools ]]; then
    umount /run/osbuild/mounts/s390-tools
    rmdir /run/osbuild/mounts/s390-tools
fi

umount /boot

exit $rc