Re: Pre-commit transaction modification question

David Ripton <dripton@ripton.net> writes:

> Is it okay if a checkin generates two versions of a badly formatted
> source file, the ugly one exactly as checked in by the user and then a
> clean one?

It's OK for the post-commit to trigger another commit, but there are
some complications.

  1/ The post-commit is asynchronous so there is a race:
     - R1 commit completes
     - R1-post-commit starts building a commit R1'
     - R2 commit completes
     - R1' attempts to complete but may fail due to R2

  2/ You need to take care to avoid loops. It's probably a good idea
     to take steps to ensure that any "automatic" commits triggered by
     a post-commit cannot trigger another "automatic" commit. Perhaps
     by using a separate user ID for the automatic commits and have
     the post-commit ignore commits by that user.

-- 
Philip Martin
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