How would I write a pre-merge hook in Git?

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You can try using the prepare-commit-msg hook. The second argument will be merge “if the commit is a merge or a .git/MERGE_MSG file exists”. A non-zero exit status will abort the commit.

I don’t think this will work with a fast-forward merge, since there won’t be a commit message.

More info on hooks: https://www.kernel.org/pub/software/scm/git/docs/githooks.html#_prepare_commit_msg

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