Check for IANA special-purpose address registry updates #83

	name: Check for IANA special-purpose address registry updates

	on:
	schedule:
	- cron: "20 16 * * *"
	workflow_dispatch:

	jobs:
	check-iana-registries:
	runs-on: ubuntu-latest

	permissions:
	contents: write
	pull-requests: write

	steps:
	- name: Checkout iana/data from main branch
	uses: actions/checkout@v4
	with:
	sparse-checkout: iana/data

	# If the branch already exists, this will fail, which will remind us about
	# the outstanding PR.
	- name: Create an iana-registries-gha branch
	run: \|
	git checkout --track origin/main -b iana-registries-gha

	- name: Retrieve the IANA special-purpose address registries
	run: \|
	IANA_IPV4="https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry-1.csv"
	IANA_IPV6="https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry-1.csv"

	REPO_IPV4="iana/data/iana-ipv4-special-registry-1.csv"
	REPO_IPV6="iana/data/iana-ipv6-special-registry-1.csv"

	curl --fail --location --show-error --silent --output "${REPO_IPV4}" "${IANA_IPV4}"
	curl --fail --location --show-error --silent --output "${REPO_IPV6}" "${IANA_IPV6}"

	- name: Create a commit and pull request
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	shell:
	bash
	# `git diff --exit-code` returns an error code if there are any changes.
	run: \|
	if ! git diff --exit-code; then
	git add iana/data/
	git config user.name "Irwin the IANA Bot"
	git commit \
	--message "Update IANA special-purpose address registries"
	git push origin HEAD
	gh pr create --fill
	fi

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