a281cca038
Ubuntu has recently release their "Snappy Ubuntu Core" which is a minimal base-layer for running docker applications. Seems like the sort of thing someone might want to use for tasks. Change-Id: I6cb724451d1862121dee4ccf1f599ab8938f0b7f
83 lines
3.5 KiB
Bash
Executable file
83 lines
3.5 KiB
Bash
Executable file
#!/bin/bash
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# These are useful, or at worst not harmful, for all images we build.
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set -eux
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set -o pipefail
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[ -n "$ARCH" ]
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[ -n "$TARGET_ROOT" ]
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shopt -s extglob
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DIB_CLOUD_IMAGES=${DIB_CLOUD_IMAGES:-http://cdimage.ubuntu.com/ubuntu-core/preview}
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DIB_RELEASE=${DIB_RELEASE:-alpha-01}
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BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-ubuntu-core-$DIB_RELEASE.img}
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BASE_IMAGE_TAR=$DIB_RELEASE-ubuntu-core.tgz
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SHA256SUMS=${SHA256SUMS:-$DIB_CLOUD_IMAGES/SHA256SUMS}
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CACHED_FILE=$DIB_IMAGE_CACHE/$BASE_IMAGE_FILE
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CACHED_TAR=$DIB_IMAGE_CACHE/$BASE_IMAGE_TAR
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CACHED_SUMS=$DIB_IMAGE_CACHE/SHA256SUMS.ubuntu-core.$DIB_RELEASE
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if [ -n "$DIB_OFFLINE" -a -f "$CACHED_TAR" ] ; then
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echo "Not checking freshness of cached $CACHED_TAR"
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else
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echo "Fetching Base Image"
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$TMP_HOOKS_PATH/bin/cache-url $SHA256SUMS $CACHED_SUMS
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$TMP_HOOKS_PATH/bin/cache-url $DIB_CLOUD_IMAGES/$BASE_IMAGE_FILE $CACHED_FILE
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pushd $DIB_IMAGE_CACHE
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if ! grep "$BASE_IMAGE_FILE" $CACHED_SUMS | sha256sum --check - ; then
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# It is likely that an upstream http(s) proxy has given us a skewed
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# result - either a cached SHA file or a cached image. Use cache-busting
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# to get (as long as caches are compliant...) fresh files.
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# Try the sha256sum first, just in case that is the stale one (avoiding
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# downloading the larger image), and then if the sums still fail retry
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# the image.
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$TMP_HOOKS_PATH/bin/cache-url -f $SHA256SUMS $CACHED_SUMS
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if ! grep "$BASE_IMAGE_FILE" $CACHED_SUMS | sha256sum --check - ; then
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$TMP_HOOKS_PATH/bin/cache-url -f \
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$DIB_CLOUD_IMAGES/$BASE_IMAGE_FILE $CACHED_FILE
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grep "$BASE_IMAGE_FILE" $CACHED_SUMS | sha256sum --check -
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fi
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fi
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popd
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if [ ! -f $CACHED_TAR -o \
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$DIB_IMAGE_CACHE/$BASE_IMAGE_FILE -nt $CACHED_TAR ] ; then
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echo "Repacking base image as tarball."
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WORKING=$(mktemp -d)
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EACTION="rm -r $WORKING"
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trap "$EACTION" EXIT
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RAW_FILE=$(basename $BASE_IMAGE_FILE)
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RAW_FILE=${RAW_FILE%.img}.raw
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qemu-img convert -f qcow2 -O raw $CACHED_FILE $WORKING/$RAW_FILE
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MAGIC_BIT=p1
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# NOTE: On RHEL, partprobe of /dev/loop0 does not create /dev/loop0p2,
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# while kpartx at least creates /dev/mapper/loop0p2.
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LOOPDEV=$(sudo kpartx -av $WORKING/$RAW_FILE | awk "/loop[0-9]+$MAGIC_BIT/ {print \$3}")
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# If running inside Docker, make our nodes manually, because udev will not be working.
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if [ -f /.dockerenv ]; then
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sudo dmsetup --noudevsync mknodes
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fi
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export LOOPDEV=$LOOPDEV
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echo "Loop device is set to: $LOOPDEV"
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if ! timeout 5 sh -c "while ! [ -e /dev/mapper/$LOOPDEV ]; do sleep 1; done"; then
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echo "Error: Could not find /dev/mapper/$LOOPDEV"
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exit 1
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fi
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EACTION="sudo kpartx -d $WORKING/$RAW_FILE;$EACTION"
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trap "$EACTION" EXIT
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mkdir $WORKING/mnt
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sudo mount /dev/mapper/$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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# Chroot in so that we get the correct uid/gid
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sudo chroot $WORKING/mnt bin/tar -cz . > $WORKING/tmp.tar
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mv $WORKING/tmp.tar $DIB_IMAGE_CACHE/$BASE_IMAGE_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 Ubuntu image on an openSUSE host)
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sudo tar -C $TARGET_ROOT --numeric-owner -xzf $DIB_IMAGE_CACHE/$BASE_IMAGE_TAR
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