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pr_glci.yml
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# Push/Trigger a GitLab CI pipeline for the PR HEAD, **ONLY IF:**
#
# 1. The .gitlab-ci.yaml file exists and validates
# 2. The PR submitter has write access to the target repository.
#
# ------------------------------------------------------------------------------
#
# NOTICE: **This file is maintained with puppetsync**
#
# This file is updated automatically as part of a puppet module baseline.
#
# The next baseline sync will overwrite any local changes to this file!
#
# ==============================================================================
#
# GitHub Action Secrets variables available for this pipeline:
#
# GitHub Secret variable Type Notes
# ------------------------ -------- ----------------------------------------
# GITLAB_API_PRIVATE_TOKEN Secure Should have `api` scope
# GITLAB_API_URL Optional
#
# The secure vars will be filtered in GitHub Actions log output, and aren't
# provided to untrusted builds (i.e, triggered by PR from another repository)
#
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
# WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!V!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
#
# DO NOT MODIFY this workflow, unless you **REALLY** know what you are doing.
#
# This workflow bypasses some of the built-in protections of the
# `pull_request_target` event by explicitly checking out the PR's **HEAD**.
# Without being VERY CAREFUL, this could easily allow a malcious PR
# contributor the chance to access secrets or a GITHUB_TOKEN with write scope!!
#
# The jobs in this workflow are designed to handle this safely -- but DO NOT
# assume any alterations will also be safe.
#
# For general information, see:
#
# https://docs.github.com/en/actions/reference/events-that-trigger-workflows#pull_request_target
#
# For further information, or if ANY of this seems confusing or unecessary:
#
# ASK FOR ASSISTANCE **BEFORE** ATTEMPTING TO MODIFY THIS WORKFLOW.
#
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
# WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!V!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
#
# https://docs.github.com/en/actions/reference/events-that-trigger-workflows
#
---
name: PR GLCI
on:
pull_request_target:
types: [opened, reopened, synchronize]
jobs:
# The ONLY reason we can validate the PR HEAD's content safely here is that
# we restrict ourselves to sending data elsewhere.
glci-syntax:
name: '.gitlab-ci.yml Syntax'
runs-on: ubuntu-latest
outputs:
valid: ${{ steps.validate-glci-file.outputs.valid }}
steps:
- uses: actions/checkout@v3
with:
repository: ${{ github.event.pull_request.head.repo.full_name }}
ref: ${{ github.event.pull_request.head.ref }}
- name: 'Validate GLCI file syntax'
id: validate-glci-file
uses: simp/github-action-gitlab-ci-syntax-check@main
with:
gitlab_api_private_token: ${{ secrets.GITLAB_API_PRIVATE_TOKEN }}
gitlab_api_url: ${{ secrets.GITLAB_API_URL }} # https://gitlab.com/api/v4
contributor-permissions:
name: 'PR contributor check'
runs-on: ubuntu-latest
outputs:
permitted: ${{ steps.user-repo-permissions.outputs.permitted }}
steps:
- uses: actions/github-script@v6
id: user-repo-permissions
with:
github-token: ${{secrets.GITHUB_TOKEN}}
# See:
# - https://octokit.github.io/rest.js/
# - https://docs.github.com/en/free-pro-team@latest/rest/reference/repos#get-repository-permissions-for-a-user
script: |
const project_permission = await github.request('GET /repos/{owner}/{repo}/collaborators/{username}/permission', {
headers: {
accept: 'application/vnd.github.v3+json'
},
owner: context.repo.owner,
repo: context.repo.repo,
username: context.payload.sender.login,
})
const has_write_access = perm_lvl => (perm_lvl == "admin" || perm_lvl == "write" )
const write_access_desc = perm_bool => (perm_bool ? "PERMISSION OK" : "PERMISSION DENIED" )
if( has_write_access(project_permission.data.permission )){
core.setOutput( 'permitted', 'true' )
} else {
core.setOutput( 'permitted', 'false' )
console.log(`::error ::payload user '${context.payload.sender.login}' does not have CI trigger permission for '${context.repository}; not triggering external CI'`)
}
console.log(`== payload user '${context.payload.sender.login}' CI trigger permission for '${context.repo.owner}': ${write_access_desc(has_write_access(project_permission.data.permission))}`)
trigger-when-user-has-repo-permissions:
name: 'Trigger CI [trusted users only]'
needs: [ glci-syntax, contributor-permissions ]
# This conditional provides an extra safety control, in case the workflow's
# `on` section is inadventently modified without considering the security
# implications.
#
# This job will ONLY trigger on:
#
# - [x] pull_request_target event: github.event_name == 'pull_request_target'
# AND:
# - [x] Newly-opened PRs: github.event.action == 'opened'
# - [x] Re-opened PRs: github.event.action == 'reopened'
# - [x] Commits are added to PR: github.event.action == 'synchronize'
# AND:
# - [x] .gitlab-ci.yml exists/ok: needs.glci-syntax.outputs.valid == 'true'
#
# [Not implemented] It should NEVER trigger on:
#
# - [ ] Merged PRs: github.event.pull_request.merged == 'false'
# - (the downstream GitLab mirror will take care of that)
# - Not implemented: For some reason, this conditional always fails
# - Unnecessary if on>pull_request_target>types doesn't include 'closed'
if: github.event_name == 'pull_request_target' && ( github.event.action == 'opened' || github.event.action == 'reopened' || github.event.action == 'synchronize' ) && github.event.pull_request.merged != 'true' && needs.glci-syntax.outputs.valid == 'true' && needs.contributor-permissions.outputs.permitted == 'true'
runs-on: ubuntu-latest
steps:
# Things we'd like to do:
# - [ ] if there's no GitLab mirror, make one
# - [ ] if there's no GitLab <-> GitHub integration, make one
# - [ ] if there's no PR check on the main GitHub branch, make one (?)
# - [x] Cancel any GLCI pipelines already pending/running for this branch
# - "created|waiting_for_resource|preparing|pending|running"
# - Exception: don't cancel existing pipeline for our own commit
# - [x] if PR: force-push branch to GitLab
- uses: actions/checkout@v3
if: needs.contributor-permissions.outputs.permitted == 'true'
with:
clean: true
fetch-depth: 0 # Need full checkout to push to gitlab mirror
repository: ${{ github.event.pull_request.head.repo.full_name }}
ref: ${{ github.event.pull_request.head.ref }}
- name: Trigger CI when user has Repo Permissions
if: needs.contributor-permissions.outputs.permitted == 'true'
uses: simp/github-action-gitlab-ci-pipeline-trigger@v1
with:
git_branch: ${{ github.event.pull_request.head.ref }} # TODO check for/avoid protected branches?
git_hashref: ${{ github.event.pull_request.head.sha }}
gitlab_api_private_token: ${{ secrets.GITLAB_API_PRIVATE_TOKEN }}
gitlab_group: ${{ github.event.organization.login }}
github_repository: ${{ github.repository }}
github_repository_owner: ${{ github.repository_owner }}
- name: When user does NOT have Repo Permissions
if: needs.contributor-permissions.outputs.permitted == 'false'
continue-on-error: true
run: |
echo "Ending gracefully; Contributor $GITHUB_ACTOR does not have permission to trigger CI"
false
### examine_contexts:
### name: 'Examine Context contents'
### if: always()
### runs-on: ubuntu-latest
### needs: [ glci-syntax, contributor-permissions ]
### steps:
### - name: Dump contexts
### env:
### GITHUB_CONTEXT: ${{ toJson(github) }}
### run: echo "$GITHUB_CONTEXT"
### - name: Dump needs context
### env:
### ENV_CONTEXT: ${{ toJson(needs) }}
### run: echo "$ENV_CONTEXT"
### - name: Dump env vars
### run: env | sort