Publish AZ SIG images

[sayanchowdhury]

To be merged with https://github.com/flatcar/jenkins-os/pull/371

The script publishes vhd images to Azure Shared Image Galleries

Pending Item:

• Need to move the download into the az_sig_publish. lbzip2 is not available in package repos. Also, need to check if curl works.
• replication to target regions is still not working. need to look into
• remove cleanup items before merge.
• update default values before merge

CI http://jenkins.infra.kinvolk.io:8080/job/container/job/az_sig_publish/98/consoleFull

[chewi]

Nice work, thanks.

Just a general tip, although Gentoo is admittedly quote-heavy in its ebuilds, you don't need to quote:

• When assigning FOO=${} or FOO=$()
• Inside [[ ]] unless it's a variable on the right-hand-side.
• case ${FOO} in

[chewi]

Suggested change

	TARGET_REGIONS=$(az account list-locations -o json | jq -r '.[] | select( .metadata.regionType != "Logical" ) | .name' | sort | grep -v -E "(${BLACKLISTED_TARGET_REGIONS// /|})" | tr '\n' ' ')
	TARGET_REGIONS=$(az account list-locations -o json | jq --args -r '[.[] | select(.metadata.regionType != "Logical") | .name] - $ARGS.positional | sort | join(" ")' ${BLACKLISTED_TARGET_REGIONS})

[chewi]

Suggested change

	if ! curl -L -o "/data/${FLATCAR_LOCAL_FILE_NAME}.bz2" "${FLATCAR_LOCAL_FILE_URL}"; then
	if ! curl -f -L -o "/data/${FLATCAR_LOCAL_FILE_NAME}.bz2" "${FLATCAR_LOCAL_FILE_URL}"; then

[chewi]

Suggested change

	version=$(echo "${vernum}" | cut -d '-' -f2)
	version=$(cut -d '-' -f2 <<< "${vernum}")

[chewi]

Suggested change

	date=$(echo "${vernum}" | cut -d '-' -f4)
	date=$(cut -d '-' -f4 <<< "${vernum}")