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Lock around ubuntu tarball download

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Make this safe for parallel builds

Change-Id: I578fa38e1d44bc205b70d087d161b471cd260fa1
This commit is contained in:
Jon-Paul Sullivan 2014-07-18 09:50:42 +01:00
parent a030387d6b
commit 94535ebb21
1 changed files with 40 additions and 25 deletions
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65
elements/ubuntu/root.d/10-cache-ubuntu-tarball
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@ -14,33 +14,48 @@ DIB_RELEASE=${DIB_RELEASE:-trusty}
BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-$DIB_RELEASE-server-cloudimg-$ARCH-root.tar.gz}
SHA256SUMS=${SHA256SUMS:-https://${DIB_CLOUD_IMAGES##http?(s)://}/$DIB_RELEASE/current/SHA256SUMS}
CACHED_FILE=$DIB_IMAGE_CACHE/$BASE_IMAGE_FILE
CACHED_FILE_LOCK=$DIB_IMAGE_CACHE/$BASE_IMAGE_FILE.lock
CACHED_SUMS=$DIB_IMAGE_CACHE/SHA256SUMS.ubuntu.$DIB_RELEASE.$ARCH
if [ -n "$DIB_OFFLINE" -a -f "$CACHED_FILE" ] ; then
echo "Not checking freshness of cached $CACHED_FILE."
else
echo "Fetching Base Image"
$TMP_HOOKS_PATH/bin/cache-url $SHA256SUMS $CACHED_SUMS
$TMP_HOOKS_PATH/bin/cache-url $DIB_CLOUD_IMAGES/$DIB_RELEASE/current/$BASE_IMAGE_FILE $CACHED_FILE
pushd $DIB_IMAGE_CACHE
if ! grep "$BASE_IMAGE_FILE" $CACHED_SUMS | sha256sum --check - ; then
# It is likely that an upstream http(s) proxy has given us a skewed
# result - either a cached SHA file or a cached image. Use cache-busting
# to get (as long as caches are compliant...) fresh files.
# Try the sha256sum first, just in case that is the stale one (avoiding
# downloading the larger image), and then if the sums still fail retry
# the image.
$TMP_HOOKS_PATH/bin/cache-url -f $SHA256SUMS $CACHED_SUMS
function get_ubuntu_tarball() {
if [ -n "$DIB_OFFLINE" -a -f "$CACHED_FILE" ] ; then
echo "Not checking freshness of cached $CACHED_FILE."
else
echo "Fetching Base Image"
$TMP_HOOKS_PATH/bin/cache-url $SHA256SUMS $CACHED_SUMS
$TMP_HOOKS_PATH/bin/cache-url \
$DIB_CLOUD_IMAGES/$DIB_RELEASE/current/$BASE_IMAGE_FILE $CACHED_FILE
pushd $DIB_IMAGE_CACHE
if ! grep "$BASE_IMAGE_FILE" $CACHED_SUMS | sha256sum --check - ; then
$TMP_HOOKS_PATH/bin/cache-url -f $DIB_CLOUD_IMAGES/$DIB_RELEASE/current/$BASE_IMAGE_FILE $CACHED_FILE
grep "$BASE_IMAGE_FILE" $CACHED_SUMS | sha256sum --check -
# It is likely that an upstream http(s) proxy has given us a skewed
# result - either a cached SHA file or a cached image. Use cache-busting
# to get (as long as caches are compliant...) fresh files.
# Try the sha256sum first, just in case that is the stale one (avoiding
# downloading the larger image), and then if the sums still fail retry
# the image.
$TMP_HOOKS_PATH/bin/cache-url -f $SHA256SUMS $CACHED_SUMS
if ! grep "$BASE_IMAGE_FILE" $CACHED_SUMS | sha256sum --check - ; then
$TMP_HOOKS_PATH/bin/cache-url -f \
$DIB_CLOUD_IMAGES/$DIB_RELEASE/current/$BASE_IMAGE_FILE $CACHED_FILE
grep "$BASE_IMAGE_FILE" $CACHED_SUMS | sha256sum --check -
fi
fi
popd
fi
popd
fi
# Extract the base image (use --numeric-owner to avoid UID/GID mismatch between
# image tarball and host OS e.g. when building Ubuntu image on an openSUSE host)
sudo tar -C $TARGET_ROOT --numeric-owner -xzf $DIB_IMAGE_CACHE/$BASE_IMAGE_FILE
if [ -e "$TARGET_ROOT/lost+found" ]; then
sudo rmdir $TARGET_ROOT/lost+found
fi
# Extract the base image (use --numeric-owner to avoid UID/GID mismatch between
# image tarball and host OS e.g. when building Ubuntu image on an openSUSE host)
sudo tar -C $TARGET_ROOT --numeric-owner -xzf $DIB_IMAGE_CACHE/$BASE_IMAGE_FILE
if [ -e "$TARGET_ROOT/lost+found" ]; then
sudo rmdir $TARGET_ROOT/lost+found
fi
}
(
echo "Getting $CACHED_FILE_LOCK: $(date)"
# Wait up to 20 minutes for another process to download
if ! flock -w 1200 9 ; then
echo "Did not get $CACHED_FILE_LOCK: $(date)"
exit 1
fi
get_ubuntu_tarball
) 9> $CACHED_FILE_LOCK