Concerning Re: update hook per project (or dir
Ryan Schmidt wrote on 6 Mar 2007, 21:49, at least in part:
[...]
> Maybe threads isn't the right word. But what I meant to say:
>
> 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?
Logical enough. What you wrote also reminds me of a couple of
scripts I use here for some operations on both local and remote
stuff. The local script calls a complementary script on the remote
system (telnet/ssh) and then waits for the remote script to finish,
and if the connection to the remote system breaks occasionally I
have to kill the local script process. Guess I understand this
business better now. Thanks, Ryan.
JH
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Received on Sat Mar 17 13:25:29 2007