[OT?] Executing Git from bash script invoked by cron

[OT?] Executing Git from bash script invoked by cron

[Johannes Schneider]

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Hi,

I try to mirror my local git repository.
Therefore I created a bash script. This script, executed form the
command line, works fine.

But the same script executed by cron, does not work. Git push does
simply nothing. No output, no push, nothing.
But git log and git --version works...

I tried to google the problem, but couldn't not find anything useful.
Any hints are welcome.


Ubuntu 64Bit
git version 1.7.0.4
cron 3.0pl1-106ubuntu5


Thanks,

Johannes
- -- 
Johannes Schneider - blog.cedarsoft.com
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Re: [OT?] Executing Git from bash script invoked by cron

[Sverre Rabbelier]

Heya,

On Mon, Jun 28, 2010 at 23:00, Johannes Schneider
<mailings@cedarsoft.com> wrote:
> But the same script executed by cron, does not work. Git push does
> simply nothing. No output, no push, nothing.

Very silly question, does the cron version have anything to push? IIRC
'git push' doesn't output anything if there's nothing to push? Try
running 'git push --verbose' instead.

-- 
Cheers,

Sverre Rabbelier

Re: [OT?] Executing Git from bash script invoked by cron

[Marc Weber]

Excerpts from Johannes Schneider's message of Mon Jun 28 23:00:56 +0200 2010:
> Hash: SHA1
> 
> Hi,
> 
> I try to mirror my local git repository.
> Therefore I created a bash script. This script, executed form the
> command line, works fine.
> 
> But the same script executed by cron, does not work. Git push does
> simply nothing. No output, no push, nothing.
> But git log and git --version works...
> 
> I tried to google the problem, but couldn't not find anything useful.
> Any hints are welcome.

What do you do in such cases? Make sure you log both: stdout and stderr.

a)
sh -c 'your quoted command &> /tmp/logfile'

b) if this still does not work use strace:

sh -c 'strace -f-o /tmp/strace.log your quoted command &> /tmp/logfile'

Then you know how much is happening.

You may also want to check that the environment is the same. Eg
export > file to create a file containing your environment.
Then source it in the cron job line somehow.

I'm not using cron that often so the solution could be simpler.

Marc Weber

Re: [OT?] Executing Git from bash script invoked by cron

[Sverre Rabbelier]

Heya,

[Mark, please don't cull the cc list]

On Mon, Jun 28, 2010 at 23:17, Marc Weber <marco-oweber@gmx.de> wrote:
> b) if this still does not work use strace:
>
> sh -c 'strace -f-o /tmp/strace.log your quoted command &> /tmp/logfile'

If you have to result to strace with git, it will probably then be
helpful to use GIT_TRACE=1, it will at least tell you what commands
are being invoked by git in a semi-human-readable format.

-- 
Cheers,

Sverre Rabbelier

Re: [OT?] Executing Git from bash script invoked by cron

[Johannes Schneider]

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On 06/28/2010 11:17 PM, Marc Weber wrote:
> sh -c 'your quoted command &> /tmp/logfile'
> 
> b) if this still does not work use strace:

That is it. Thanks.
Of course, git writes to stderr. And I did not redirect it properly.
I don't understand the details, but this line is working now:

sh -c 'myscript' >> logfile 2> err


The problem - by the way - is related to ssh authentification...
But that is another issue...


But here comes my question: Obviously all output created by git push is
written to stderr. I'd expected that most of the content will end up in
stdout.
But I am sure there is a good reason for it - so I just accept it ;-)


Thanks,

Johannes
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Re: [OT?] Executing Git from bash script invoked by cron

[Ramkumar Ramachandra]

Hi Johannes,

Johannes Schneider writes:
> I try to mirror my local git repository.
> Therefore I created a bash script. This script, executed form the
> command line, works fine.
> 
> But the same script executed by cron, does not work. Git push does
> simply nothing. No output, no push, nothing.
> But git log and git --version works...

Perhaps you're not executing that `git push` as the same user, and
therefore there's some problem reading the config files to determine
where to push to? I really can't tell much else without some output.

-- Ram

Re: [OT?] Executing Git from bash script invoked by cron

[Matthieu Moy]

Johannes Schneider <mailings@cedarsoft.com> writes:

> But the same script executed by cron, does not work. Git push does
> simply nothing. No output, no push, nothing.
> But git log and git --version works...

One common problem with cron jobs is that you don't have the same
$PATH in your shell and in cron. If you have no output at all, I'd say
you didn't reach the line where git is executed in your script.

Try to add a

  set -x

at the beginning of your script to see what it's doing.

-- 
Matthieu Moy
http://www-verimag.imag.fr/~moy/