Avoid building 'master' from forks via cron

Build Environment
1

How can we stop nightly builds from being run on PRs coming from a master branch?

A config like below will run nightly-job not just for user/project/master but also for otheruser/project/master.

workflows:
  do-nightly:
    jobs:
      - nightly-job
    triggers:
      - schedule:
          cron: "0 0 * * *"
          filters:
            branches:
              only:
                - master

We have a workaround that runs a shell script checking $CIRCLE_PROJECT_USERNAME, but jobs still get queued and run.

@afeld posted a solution in Create separate steps/jobs for PR/Forks versus branches (thread closed, or I’d have bumped this there) that does not require actually running anything:

jobs:
  - forks_only:
      filters:
        branches:
          # only from forks
          only: /^pull\/.*$/
  - canonical_repo_only:
      filters:
        branches:
          # only from canonical repository
          # https://stackoverflow.com/a/5334825/358804
          only: /^(?!pull\/).*$/

Does this still work? The documentation does not specify what string is matched against, or if a non-regex match matches any part, just the branch name part, in total or in part.

Clarification would be greatly appreciated.

2

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