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Re: Subversion clients wait for post-commit to finish

From: Ryan Schmidt <subversion-2006Q1_at_ryandesign.com>
Date: 2006-02-08 22:40:54 CET

On Feb 8, 2006, at 22:10, Josh Kuo wrote:

>>>>>> To duplicate a problem, put 'sleep 20' in your
>>>>>> post-commit hook script. Then do a commit. The commit
>>>>>> will hang for 20 seconds on 'Transmitting file data .'
>>>>>> step.
>>>>>> I run Subversion 1.3 on Apache 2.0.55 on Slackware
>>>>>> 10.2.
>>>>> You need to make sure that the backgrounded job closes its
>>>>> stdout and
>>>>> stderr filehandles. Something like:
>>>>> my-process > /dev/null 2>&1 &
>>>>> Once that is done, the process should be backgrounded correctly.
>>>> Unfortunately, that didn't do the trick.
>>>> I tried:
>>>> sleep 20 > /dev/null 2>&1 &
>>>> and committing a file still pauses for 20 seconds.
>>> I tried the same thing in my post-commit script and I don't get a 20
>>> second delay.
>> What OS and version of Apache/Subversion are you using?
> OS: Debian sarge (upgraded to 2.6.13 kernel)
> Apache: 2.054
> SVN: 1.1.4
> If you want, you can send me the post-commit script and I'll take a
> look...

Ah, now this topic is interesting to me. For the longest time I've
wanted to spawn off a process in a post-commit hook to do some extra
work after the commit is done, without making the client wait for it,
but I never got around to trying it. Well thanks to this thread, now
I have, and I also can't get the post-commit hook to relinquish
control back to the client until the spawned process is completed.

My repository is in /tmp/repo. Here's the post-commit hook:



        /tmp/repo/hooks/countdown.sh "${REPO}" "${REV}" >/dev/null 2>&1 &

And here's countdown.sh:



        for ((i=5; i>0; i-=1)); do
                sleep 1
                echo `date` REPO=${REPO} REV=${REV} PID=$$ I=$i >> /tmp/svnlog.txt

And then in one window I monitor svnlog.txt:

        tail -f /tmp/svnlog.txt

And in another, I change a file in a working copy and commit it:

        echo `date` > foo && svn ci -m ""

It outputs this:

        Sending foo
        Transmitting file data .

And I get the countdown in the log file. And only after the countdown
finishes does the commit finish:

        Committed revision 7.

This is Subversion 1.3.0 with APR 1.2.2 compiled through DarwinPorts
on Mac OS X 10.4.4 PPC. It's an FSFS repository created just now for
testing, accessed via the file:// protocol.

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Received on Wed Feb 8 22:42:45 2006

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