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Use conditional GET to fetch latest ubuntu image.

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This also switches to using curl which some people may not have
installed. However, curl is far superior for this type of download.

Change-Id: I7ac5a84b30eb8daad320c082f976931c41a24669
This commit is contained in:
Clint Byrum 2013-04-30 16:36:56 -07:00
parent f725be5dd1
commit 60a1405eef
1 changed files with 25 additions and 10 deletions
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35
elements/ubuntu/root.d/10-cache-ubuntu-tarball
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@ -14,17 +14,32 @@ DIB_RELEASE=${DIB_RELEASE:-quantal}
BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-$DIB_RELEASE-server-cloudimg-$ARCH-root.tar.gz}
SHA256SUMS=${SHA256SUMS:-https://${DIB_CLOUD_IMAGES##http?(s)://}/$DIB_RELEASE/current/SHA256SUMS}
mkdir -p $IMG_PATH
# TODO: don't cache -current forever.
if [ ! -f $IMG_PATH/$BASE_IMAGE_FILE ] ; then
echo "Fetching Base Image"
wget $SHA256SUMS -O $IMG_PATH/SHA256SUMS.ubuntu.$DIB_RELEASE.$ARCH
wget $DIB_CLOUD_IMAGES/$DIB_RELEASE/current/$BASE_IMAGE_FILE -O $IMG_PATH/$BASE_IMAGE_FILE.tmp
pushd $IMG_PATH
awk "/$BASE_IMAGE_FILE/ { print \$0 \".tmp\" }" SHA256SUMS.ubuntu.$DIB_RELEASE.$ARCH | sha256sum --check -
popd
mv $IMG_PATH/$BASE_IMAGE_FILE.tmp $IMG_PATH/$BASE_IMAGE_FILE
cache_url()
{
local url=$1
local dest=$2
local tmp=$(mktemp $(dirname $dest)/.download.XXXXXXXX)
rcode=$(curl -o $tmp -z $dest -w '%{http_code}' $url)
if [ "$rcode" == "200" ] ; then
echo "Server copy has changed. Using server version of $url"
mv $tmp $dest
elif [ "$rcode" == "304" ] ; then
echo "Server copy has not changed. Using locally cached $url"
rm -f $tmp
else
echo "Server returned an unexpected response code. [$rcode]"
rm -f $tmp
return 1
fi
}
mkdir -p $IMG_PATH
echo "Fetching Base Image"
cache_url $SHA256SUMS $IMG_PATH/SHA256SUMS.ubuntu.$DIB_RELEASE.$ARCH
cache_url $DIB_CLOUD_IMAGES/$DIB_RELEASE/current/$BASE_IMAGE_FILE $IMG_PATH/$BASE_IMAGE_FILE
pushd $IMG_PATH
grep "$BASE_IMAGE_FILE" SHA256SUMS.ubuntu.$DIB_RELEASE.$ARCH | sha256sum --check -
popd
# Extract the base image
sudo tar -C $TARGET_ROOT -xzf $IMG_PATH/$BASE_IMAGE_FILE
sudo rmdir $TARGET_ROOT/lost+found