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Re: update hook per project (or directory)

From: Ryan Schmidt <subversion-2007a_at_ryandesign.com>
Date: 2007-03-17 23:28:48 CET

On Mar 17, 2007, at 07:25, Jan Hendrik wrote:

>> Anything you do just in the post-commit hook, or any script the post-
>> commit hook calls, or any script called by such a script, and so
>> forth, is fine.
>> However, if you fork off a new process (create a thread, whatever),
>> then that is a separate process and the post-commit hook itself can
>> end before the forked process does, and that's when problems as
>> described above can start.
>> So, by (Unix) example (since I don't know Windows):
>> If my post-commit hook is...
>> #!/bin/sh
>> REPOS="$1"
>> REV="$2"
>> /path/to/some-other-script.sh "$REPOS" "$REV"
>> ....then everything is fine, because post-commit will wait for some-
>> other-script.sh to finish before it finishes.
>> However, if my post-commit hook is...
>> #!/bin/sh
>> REPOS="$1"
>> REV="$2"
>> /path/to/some-other-script.sh "$REPOS" "$REV" >/dev/null 2>/dev/
>> null &
>> ....then some-other-script.sh has been forked off into its own
>> process, and post-commit ends immediately, before some-other-
>> script.sh is done running, which can cause the possible problems as
>> mentioned above.
> I am not very versed with pipes, but if the output/result/whatever of
> a script/program is directed elsewhere (>/dev/null ...) then this is a
> fork-off or new thread and the calling script would not wait for
> stuff?


It's not the redirecting of stdout and stderr; it's the "&" character
at the end that causes a new process to be forked. However,
Subversion has recently acquired a new "feature" whereby if you do
not also redirect stdout and stderr somewhere, Subversion will still
wait for that forked process to end before returning from the hook

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Received on Sat Mar 17 23:29:53 2007

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