Surfacing author / username information to Slack notifier (GH)

[wyardley]

Is there any way to surface author information? I see some references to _COMMIT_AUTHOR_EMAIL, but, by default, neither that or anything like it is surfaced in the payload I see when using GitHub triggers:

cloud-build-notifiers/lib/notifiers/jsonpath_test.go

Line 96 in 140b8ad

"_COMMIT_AUTHOR_EMAIL": "$(build.substitutions._COMMIT_AUTHOR_EMAIL)",

Is there a way to get the author email and / or GitHub email into something I can use downstream in the notifier?

[wyardley]

btw, confirmed on the GCP community Slack with a member of the Cloud Build team that this doesn't seem to be a thing.

[wyardley]

Turns out it is possible, but you have to add it as a substitution
For example, if you add _COMMIT_AUTHOR with a value of $(commit.author.login), it will get populated.

Docs: https://cloud.google.com/build/docs/configuring-builds/use-bash-and-bindings-in-substitutions