Merge "Use conditional GET to fetch latest ubuntu image."
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commit
bd0f73f4cc
@ -14,17 +14,32 @@ DIB_RELEASE=${DIB_RELEASE:-quantal}
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BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-$DIB_RELEASE-server-cloudimg-$ARCH-root.tar.gz}
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SHA256SUMS=${SHA256SUMS:-https://${DIB_CLOUD_IMAGES##http?(s)://}/$DIB_RELEASE/current/SHA256SUMS}
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cache_url()
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{
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local url=$1
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local dest=$2
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local tmp=$(mktemp $(dirname $dest)/.download.XXXXXXXX)
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rcode=$(curl -o $tmp -z $dest -w '%{http_code}' $url)
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if [ "$rcode" == "200" ] ; then
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echo "Server copy has changed. Using server version of $url"
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mv $tmp $dest
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elif [ "$rcode" == "304" ] ; then
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echo "Server copy has not changed. Using locally cached $url"
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rm -f $tmp
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else
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echo "Server returned an unexpected response code. [$rcode]"
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rm -f $tmp
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return 1
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fi
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}
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mkdir -p $IMG_PATH
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# TODO: don't cache -current forever.
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if [ ! -f $IMG_PATH/$BASE_IMAGE_FILE ] ; then
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echo "Fetching Base Image"
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wget $SHA256SUMS -O $IMG_PATH/SHA256SUMS.ubuntu.$DIB_RELEASE.$ARCH
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wget $DIB_CLOUD_IMAGES/$DIB_RELEASE/current/$BASE_IMAGE_FILE -O $IMG_PATH/$BASE_IMAGE_FILE.tmp
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pushd $IMG_PATH
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awk "/$BASE_IMAGE_FILE/ { print \$0 \".tmp\" }" SHA256SUMS.ubuntu.$DIB_RELEASE.$ARCH | sha256sum --check -
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popd
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mv $IMG_PATH/$BASE_IMAGE_FILE.tmp $IMG_PATH/$BASE_IMAGE_FILE
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fi
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echo "Fetching Base Image"
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cache_url $SHA256SUMS $IMG_PATH/SHA256SUMS.ubuntu.$DIB_RELEASE.$ARCH
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cache_url $DIB_CLOUD_IMAGES/$DIB_RELEASE/current/$BASE_IMAGE_FILE $IMG_PATH/$BASE_IMAGE_FILE
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pushd $IMG_PATH
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grep "$BASE_IMAGE_FILE" SHA256SUMS.ubuntu.$DIB_RELEASE.$ARCH | sha256sum --check -
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popd
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# Extract the base image
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sudo tar -C $TARGET_ROOT -xzf $IMG_PATH/$BASE_IMAGE_FILE
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sudo rmdir $TARGET_ROOT/lost+found
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