Detecting changes against main branch on main branch merge? about paths-filter HOT 2 OPEN

I'm having a similar problem. The action works perfectly fine in PRs/branches, but once I perform a merge operation... it fails because of the same problem.

I'm considering doing something similar as to what you have done, although perhaps even more complicated, with some added conditional logic to only perform the checkout when there is a merge operation (what remains to be seen is how I'll make it to define base conditionally, as it doesn't make sense to obtain PREV_COMMIT_SHA if I didn't perform a checkout yet).

Another option is to make this to not execute this action on merge, and modify the conditionals that depend on this one to also execute on merge. That would save less time in CI, but I don't expect as many merge operations as commits to PRs.

EDIT: It seems that we can use conditionals in expressions actions/runner#409 , the approximation is a bit brittle ("same" as in POSIX shell, ugh), but better than nothing.

from paths-filter.

Hi both.

Can't you achieve this with just base: ${{ github.ref }} ? It seems that its working correctly for both open PRs and further pushes to the PR and when I merge the PR to main. Curious if I'm missing anything.

from paths-filter.