URL of the last artifact of a GitHub-action build

Question

I use GitHub-action for my build, and it generates multiple artifacts (with a different name).

Is there a way to predict the URL of the artifacts of the last successful build? Without knowing the sha1, only the name of the artifact and the repo?

Answer 1

At the moment, no, according to comments from staff although this may change with future versions of the upload-artifact action.

After poking around myself, it is possible to get this using the GitHub actions API: https://developer.github.com/v3/actions/artifacts/

GET /repos/:owner/:repo/actions/runs/:run_id/artifacts

So you can receive a JSON reply and iterate through the "artifacts" array to get the corresponding "archive_download_url". A workflow can fill in the URL like so:

/repos/${{ github.repository }}/actions/runs/${{ github.run_id }}/artifacts

Answer 2

I have developed a service that exposes predictable URLs to either the latest or a particular artifact of a repository's branch+workflow.

https://nightly.link/
https://github.com/oprypin/nightly.link

This is implemented as a GitHub App, and communication with GitHub is authenticated, but users that only download don't need to even log in to GitHub.

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The implementation goes and fetches this through the API, in 3 steps:

• https://api.github.com/repos/:owner/:repo/actions/workflows/someworkflow.yml/runs?per_page=1&branch=master&event=push&status=success
• https://api.github.com/repos/:owner/:repo/actions/runs/123456789/artifacts?per_page=100
• https://api.github.com/repos/:owner/:repo/actions/artifacts/87654321/zip

(the last one redirects you to an ephemeral direct download URL)

Note that authentication is required. For OAuth that's public_repo (or repo if appropriate). For GitHub Apps that's "Actions"/"Read-only".

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There is indeed no more direct way to do this.

Some relevant issues are

• https://github.com/actions/upload-artifact/issues/51
• https://github.com/actions/upload-artifact/issues/27