Fast-forward tracking branch for selected CodeQL version #15

	# Fast-forwards the branch specified in BRANCH_NAME
	# to the github.ref/sha that this workflow is run on.
	# Used as part of the release process, to ensure
	# external query writers can always access a branch of github/codeql
	# that is compatible with the latest stable release.
	name: Fast-forward tracking branch for selected CodeQL version
	on:
	workflow_dispatch:

	jobs:
	fast-forward:
	name: Fast-forward tracking branch for selected CodeQL version
	runs-on: ubuntu-latest
	if: github.repository == 'github/codeql'
	permissions:
	contents: write
	env:
	BRANCH_NAME: 'lgtm.com'
	steps:
	- name: Validate chosen branch
	if: ${{ !startsWith(github.ref_name, 'codeql-cli-') }}
	shell: bash
	run: \|
	echo "::error ::The $BRANCH_NAME tracking branch should only be fast-forwarded to the tip of a codeql-cli-* branch, got $GITHUB_REF_NAME instead."
	exit 1

	- name: Checkout
	uses: actions/checkout@v4

	- name: Git config
	shell: bash
	run: \|
	git config user.name "github-actions[bot]"
	git config user.email "41898282+github-actions[bot]@users.noreply.github.com"

	- name: Fetch
	shell: bash
	run: \|
	set -x
	echo "Fetching $BRANCH_NAME"
	# Explicitly unshallow and fetch to ensure the remote ref is available.
	git fetch --unshallow origin "$BRANCH_NAME"
	git checkout -b "$BRANCH_NAME" "origin/$BRANCH_NAME"

	- name: Fast-forward
	shell: bash
	run: \|
	echo "Fast-forwarding $BRANCH_NAME to ${GITHUB_REF}@${GITHUB_SHA}"
	git merge --ff-only "$GITHUB_SHA"
	git push origin "$BRANCH_NAME"

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