diskimage-builder/diskimage_builder/elements/sysprep/bin/extract-image

131 lines
5.0 KiB
Plaintext
Raw Normal View History

#!/bin/bash
# Intended to be called from the root.d cloud-image script as follows:
# $TMP_HOOKS_PATH/bin/extract-image $BASE_IMAGE_FILE $BASE_IMAGE_TAR $IMAGE_LOCATION $CACHED_IMAGE
if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
set -x
fi
set -eu
set -o pipefail
BASE_IMAGE_FILE=$1
BASE_IMAGE_TAR=$2
IMAGE_LOCATION=$3
CACHED_IMAGE=$4
CACHED_TAR=$DIB_IMAGE_CACHE/$BASE_IMAGE_TAR
DIB_LOCAL_IMAGE=${DIB_LOCAL_IMAGE:-""}
TAR_LOCK=$CACHED_TAR.lock
function extract_image() {
if [ -n "$DIB_OFFLINE" -a -f "$CACHED_TAR" ] ; then
echo "Not checking freshness of cached $CACHED_TAR."
else
if [ -z "$DIB_LOCAL_IMAGE" ]; then
echo "Fetching Base Image"
# There seems to be some bad Fedora mirrors returning http 404's for the cloud image.
# If the image fails to download due to a 404 we retry once.
set +e
$TMP_HOOKS_PATH/bin/cache-url $IMAGE_LOCATION $CACHED_IMAGE
RV=$?
set -e
if [ "$RV" == "44" ] ; then
$TMP_HOOKS_PATH/bin/cache-url $IMAGE_LOCATION $CACHED_IMAGE
elif [ "$RV" != "0" ] ; then
exit 1
fi
fi
if [ ! -f $CACHED_TAR -o \
$CACHED_IMAGE -nt $CACHED_TAR ] ; then
echo "Repacking base image as tarball."
WORKING=$(mktemp --tmpdir=${TMP_DIR:-/tmp} -d)
EACTION="rm -r $WORKING"
trap "$EACTION" EXIT
echo "Working in $WORKING"
RAW_FILE=$(mktemp --tmpdir=$WORKING XXXXXX.raw)
if [ "${CACHED_IMAGE: -3}" == ".xz" ] ; then
QCOW2_FILE=$(mktemp --tmpdir=$WORKING XXXXXX.qcow2)
# This leaves the old image in place so cache-url wont get it again
unxz --stdout $CACHED_IMAGE > $QCOW2_FILE
CACHED_IMAGE=$QCOW2_FILE
fi
qemu-img convert -f qcow2 -O raw $CACHED_IMAGE $RAW_FILE
ROOT_PARTITION=p$(sudo kpartx -l $RAW_FILE | awk "/loop[0-9]+p/"|wc -l)
sudo udevadm settle
# kpartx fails if no /dev/loop* exists, "losetup -f" prints first unused
# loop device and creates it if it doesn't exist
sudo losetup -f
# XXX: Parsing stdout is dangerous, would like a better way to discover
# the device used for the image.
ROOT_LOOPDEV=$(sudo kpartx -av $RAW_FILE | \
awk "/loop[0-9]+$ROOT_PARTITION/ {print \$3}")
# If running inside Docker, make our nodes manually, because udev will not be working.
if [ -f /.dockerenv ]; then
sudo dmsetup --noudevsync mknodes
fi
if ! timeout 5 sh -c "while ! [ -e /dev/mapper/$ROOT_LOOPDEV ]; do sleep 1; done"; then
echo "Error: Could not find /dev/mapper/$ROOT_LOOPDEV"
exit 1
fi
EACTION="sudo kpartx -d $RAW_FILE ; $EACTION"
trap "$EACTION" EXIT
mkdir $WORKING/mnt
if [ "xfs" = "$(sudo blkid -o value -s TYPE /dev/mapper/$ROOT_LOOPDEV)" ]; then
# mount xfs with nouuid, just in case that uuid is already mounted
# use ro to avoid/workaround xfs uuid issues on older
# kernels with newer rhel images which seem to set
# flags to generate unique uuid's:
# xfs superblock has incompatible features (0x4)
# we don't need to worry about this, we just want the data
MOUNTOPTS="-o nouuid,ro"
else
MOUNTOPTS=""
fi
sudo mount $MOUNTOPTS /dev/mapper/$ROOT_LOOPDEV $WORKING/mnt
EACTION="sudo umount -f $WORKING/mnt ; $EACTION"
trap "$EACTION" EXIT
# find out if chroot tar has full xattr support
if [ 0 == `sudo chroot $WORKING/mnt bin/tar --help | grep -c xattrs-exclude` ]; then
TAROPTS="--no-xattrs"
else
TAROPTS="--xattrs --xattrs-include=* --xattrs-exclude=security.selinux"
fi
# Chroot in so that we get the correct uid/gid
sudo chroot $WORKING/mnt bin/tar $TAROPTS -cz . > $WORKING/tmp.tar
mv $WORKING/tmp.tar $CACHED_TAR
else
echo "Using cached tar from $CACHED_TAR"
fi
fi
# Extract the base image (use --numeric-owner to avoid UID/GID mismatch between
# image tarball and host OS e.g. when building Fedora image on an openSUSE host)
# Include all xattrs except selinux because the selinux ones cause issues in our
# chroot environment, and we restore all of those at the end of the build anyway.
echo "Extracting base root image from $CACHED_TAR"
sudo tar -C $TARGET_ROOT --numeric-owner --xattrs --xattrs-include='*' --xattrs-exclude='security.selinux' -xzf $CACHED_TAR
}
(
echo "Getting $TAR_LOCK: $(date)"
# Wait up to 20 minutes for another process to download
if ! flock -w 1200 9 ; then
echo "Did not get $TAR_LOCK: $(date)"
exit 1
fi
extract_image
) 9> $TAR_LOCK