Roll out next 39.20230916.1.2 #96

	---
	name: Check stream diffs
	on:
	pull_request:
	branches: [main]
	paths: ["streams/*.json"]
	permissions:
	contents: read

	jobs:
	stream-diff:
	name: Check stream diffs
	runs-on: ubuntu-latest
	steps:
	- name: Check out repository
	uses: actions/checkout@v3
	with:
	fetch-depth: 0
	- name: Genericize metadata
	run: \|
	# Cache data from PR head
	mkdir head
	cp -r streams ci/genericize-stream.py head

	# Switch to base
	git checkout "${GITHUB_BASE_REF}"

	# Get the numerically latest fedora-coreos-stream-generator tag
	generator_tag=$(
	curl -H 'Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}' https://api.github.com/repos/coreos/fedora-coreos-stream-generator/git/matching-refs/tags/ \|
	jq -r .[].ref \|
	sed s:^refs/tags/:: \|
	sort -V \|
	tail -n 1)
	echo "Current fedora-coreos-stream-generator: ${generator_tag}"

	# Genericize metadata
	mkdir -p {old,new}/streams
	for stream in streams/*.json; do
	if cmp -s "${stream}" "head/${stream}"; then
	# Base and head identical; ignore stream to avoid false
	# positives if the generator field is stale
	echo "${stream} unchanged, skipping"
	continue
	fi
	echo "${stream}, old"
	# Pretend the old metadata used the latest tag of
	# fedora-coreos-stream-generator.
	head/genericize-stream.py -g "${generator_tag}" "${stream}" > "old/${stream}"
	echo "${stream}, new"
	head/genericize-stream.py "head/${stream}" > "new/${stream}"
	done
	- name: Compare genericized metadata
	uses: coreos/actions-lib/check-diff@main
	with:
	basedir: old
	patchdir: new

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