If a developer makes a direct push to a branch using a repository's Stash URL, the post-receive hook gets successfully triggered.
However, the same hook doesn't trigger if the developer uses the Merge button after his/her changes are code reviewed.
I thought that since the pull request merge happens server-side, the post-commit hook would be the correct place to have a repository trigger. However, having the repo trigger in both the post-receive and post-commit still didn't work after using the Merge button in a pull request.
Is this a bug? What hooks are called before and after the server-side merge in Stash?
The mechanism that performs the pull request merge is actually based on a git fetch into the repository, which doesn't trigger receive hooks. Unfortunately there are currently no hooks that will be invoked automatically after a merge.
That said, if you want to trigger functionality based on a pull request merge, you can build a Stash plugin that consumes the PullRequestMergedEvent. There is also a java API for implementing commit-hooks in a plugin. If you're unfamiliar with Atlassian plugins, the Atlassian SDK is a good place to start.
I'd also keep an eye on STASH-2521, which tracks improved commit hooks support in Stash and should hit arelease in the near future.
Here's an update on my answer from last year:
Repository hooks implementing AsyncPostReceiveRepositoryHook will be called for both pushes and Pull Request merges. See https://developer.atlassian.com/stash/docs/latest/how-tos/repository-hooks.html for full details.
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