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Allowing ubuntu element use local image

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Patch allow to set path for local image source,
instead download latest or use the cached image.
This permit to build image also in environment without internet access.

Change-Id: I9422e21c5d0445e31d5a7258aa7310b20e39b929
This commit is contained in:
Marco Vaschetto 2021-09-14 22:25:30 +02:00
parent 3c3ef6e32b
commit 1f4fb1d7a5
3 changed files with 43 additions and 23 deletions
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6
diskimage_builder/elements/ubuntu/README.rst
View File

@ -21,5 +21,11 @@ Overrides:
``(universe|multiverse)``
* Setting ``DIB_DISTRIBUTION_MIRROR_UBUNTU_INSECURE`` updates apt
settings to allow insecure/unuthenticated repositories.
* Setting ``DIB_OFFLINE`` will prevent to download again the source image
if is already present in to $DIB_IMAGE_CACHE path.
* Setting ``DIB_LOCAL_IMAGE`` in combination with ``DIB_OFFLINE`` to
use a image from a local source (full path and file name) and not
download image from internet. Local source for release Trusty and Xenial
have to be tar.gz format. For other more recent release get the squashfs image.
.. element_deps::

1
diskimage_builder/elements/ubuntu/environment.d/99-cloud-init-datasources.bash
View File

@ -2,3 +2,4 @@
# allowing the Ec2 data source from being queried on first boot, unless
# specified otherwise.
export DIB_CLOUD_INIT_DATASOURCES=${DIB_CLOUD_INIT_DATASOURCES:-"Ec2"}
export DIB_IMAGE_LOCAL_FILE=${DIB_IMAGE_LOCAL_FILE:-}

59
diskimage_builder/elements/ubuntu/root.d/10-cache-ubuntu-tarball
View File

@ -25,36 +25,49 @@ CACHED_FILE_LOCK=$DIB_LOCKFILES/$BASE_IMAGE_FILE.lock
CACHED_SUMS=$DIB_IMAGE_CACHE/SHA256SUMS.ubuntu.$DIB_RELEASE.$ARCH
function get_ubuntu_tarball() {
if [ -n "$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 \
$DIB_CLOUD_IMAGES/$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 $CACHED_SUMS
if [ -n "$DIB_OFFLINE" -a -z "$DIB_LOCAL_IMAGE" ] ; then
if [ -f "$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 \
$DIB_CLOUD_IMAGES/$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 \
$DIB_CLOUD_IMAGES/$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 \
$DIB_CLOUD_IMAGES/$BASE_IMAGE_FILE $CACHED_FILE
grep "$BASE_IMAGE_FILE" $CACHED_SUMS | sha256sum --check -
fi
fi
popd
fi
popd
elif [ ! -f "$DIB_LOCAL_IMAGE" ] ; then
echo "Unable to find image $DIB_LOCAL_IMAGE locally! Check path and file name to source image"
exit 1
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)
if [ $DIB_RELEASE != "trusty" ] && [ $DIB_RELEASE != "xenial" ]; then
sudo unsquashfs -f -d $TARGET_ROOT $DIB_IMAGE_CACHE/$BASE_IMAGE_FILE
if [ "$DIB_RELEASE" != "trusty" ] && [ "$DIB_RELEASE" != "xenial" ] ; then
if [ -n "$DIB_LOCAL_IMAGE"] ; then
sudo unsquashfs -f -d $TARGET_ROOT $DIB_IMAGE_CACHE/$BASE_IMAGE_FILE
else
sudo unsquashfs -f -d $TARGET_ROOT $DIB_LOCAL_IMAGE
fi
else
sudo tar -C $TARGET_ROOT --numeric-owner -xzf $DIB_IMAGE_CACHE/$BASE_IMAGE_FILE
if [ -n "$DIB_LOCAL_IMAGE"] ; then
sudo tar -C $TARGET_ROOT --numeric-owner -xzf $DIB_IMAGE_CACHE/$BASE_IMAGE_FILE
else
sudo tar -C $TARGET_ROOT --numeric-owner -xzf $DIB_LOCAL_IMAGE
fi
fi
}