126 lines
4.7 KiB
Bash
Executable File
126 lines
4.7 KiB
Bash
Executable File
#!/bin/bash
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# Intended to be called from the root.d cloud-image script as follows:
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# $TMP_HOOKS_PATH/bin/extract-image $BASE_IMAGE_FILE $BASE_IMAGE_TAR $IMAGE_LOCATION $CACHED_IMAGE
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if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
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set -x
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fi
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set -eu
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set -o pipefail
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BASE_IMAGE_FILE=$1
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BASE_IMAGE_TAR=$2
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IMAGE_LOCATION=$3
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CACHED_IMAGE=$4
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CACHED_TAR=$DIB_IMAGE_CACHE/$BASE_IMAGE_TAR
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DIB_LOCAL_IMAGE=${DIB_LOCAL_IMAGE:-""}
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TAR_LOCK=$CACHED_TAR.lock
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function extract_image() {
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if [ -n "$DIB_OFFLINE" -a -f "$CACHED_TAR" ] ; then
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echo "Not checking freshness of cached $CACHED_TAR."
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else
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if [ -z "$DIB_LOCAL_IMAGE" ]; then
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echo "Fetching Base Image"
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# There seems to be some bad Fedora mirrors returning http 404's for the cloud image.
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# If the image fails to download due to a 404 we retry once.
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set +e
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$TMP_HOOKS_PATH/bin/cache-url $IMAGE_LOCATION $CACHED_IMAGE
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RV=$?
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set -e
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if [ "$RV" == "44" ] ; then
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$TMP_HOOKS_PATH/bin/cache-url $IMAGE_LOCATION $CACHED_IMAGE
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elif [ "$RV" != "0" ] ; then
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exit 1
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fi
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fi
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if [ ! -f $CACHED_TAR -o \
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$CACHED_IMAGE -nt $CACHED_TAR ] ; then
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echo "Repacking base image as tarball."
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WORKING=$(mktemp --tmpdir=${TMP_DIR:-/tmp} -d)
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EACTION="rm -r $WORKING"
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trap "$EACTION" EXIT
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echo "Working in $WORKING"
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RAW_FILE=$(mktemp --tmpdir=$WORKING XXXXXX.raw)
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if [ "${CACHED_IMAGE: -3}" == ".xz" ] ; then
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QCOW2_FILE=$(mktemp --tmpdir=$WORKING XXXXXX.qcow2)
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# This leaves the old image in place so cache-url wont get it again
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unxz --stdout $CACHED_IMAGE > $QCOW2_FILE
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CACHED_IMAGE=$QCOW2_FILE
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fi
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qemu-img convert -f qcow2 -O raw $CACHED_IMAGE $RAW_FILE
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ROOT_PARTITION=p$(sudo kpartx -l $RAW_FILE | awk "/loop[0-9]+p/"|wc -l)
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sudo udevadm settle
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# kpartx fails if no /dev/loop* exists, "losetup -f" prints first unused
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# loop device and creates it if it doesn't exist
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sudo losetup -f
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# XXX: Parsing stdout is dangerous, would like a better way to discover
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# the device used for the image.
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ROOT_LOOPDEV=$(sudo kpartx -av $RAW_FILE | \
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awk "/loop[0-9]+$ROOT_PARTITION/ {print \$3}")
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# If running inside Docker, make our nodes manually, because udev will not be working.
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if [ -f /.dockerenv ]; then
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sudo dmsetup --noudevsync mknodes
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fi
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if ! timeout 5 sh -c "while ! [ -e /dev/mapper/$ROOT_LOOPDEV ]; do sleep 1; done"; then
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echo "Error: Could not find /dev/mapper/$ROOT_LOOPDEV"
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exit 1
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fi
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EACTION="sudo kpartx -d $RAW_FILE ; $EACTION"
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trap "$EACTION" EXIT
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mkdir $WORKING/mnt
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if [ "xfs" = "$(sudo blkid -o value -s TYPE /dev/mapper/$ROOT_LOOPDEV)" ]; then
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# mount xfs with nouuid, just in case that uuid is already mounted
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MOUNTOPTS="-o nouuid"
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else
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MOUNTOPTS=""
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fi
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sudo mount $MOUNTOPTS /dev/mapper/$ROOT_LOOPDEV $WORKING/mnt
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EACTION="sudo umount -f $WORKING/mnt ; $EACTION"
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trap "$EACTION" EXIT
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# find out if chroot tar has full xattr support
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if [ 0 == `sudo chroot $WORKING/mnt bin/tar --help | grep -c xattrs-exclude` ]; then
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TAROPTS="--no-xattrs"
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else
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TAROPTS="--xattrs --xattrs-include='*' --xattrs-exclude='security.selinux'"
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fi
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# Chroot in so that we get the correct uid/gid
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sudo chroot $WORKING/mnt bin/tar $TAROPTS -cz . > $WORKING/tmp.tar
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mv $WORKING/tmp.tar $CACHED_TAR
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else
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echo "Using cached tar from $CACHED_TAR"
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fi
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fi
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# Extract the base image (use --numeric-owner to avoid UID/GID mismatch between
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# image tarball and host OS e.g. when building Fedora image on an openSUSE host)
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# Include all xattrs except selinux because the selinux ones cause issues in our
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# chroot environment, and we restore all of those at the end of the build anyway.
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echo "Extracting base root image from $CACHED_TAR"
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sudo tar -C $TARGET_ROOT --numeric-owner --xattrs --xattrs-include='*' --xattrs-exclude='security.selinux' -xzf $CACHED_TAR
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}
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(
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echo "Getting $TAR_LOCK: $(date)"
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# Wait up to 20 minutes for another process to download
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if ! flock -w 1200 9 ; then
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echo "Did not get $TAR_LOCK: $(date)"
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exit 1
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fi
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extract_image
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) 9> $TAR_LOCK
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