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Re: E165001 pre-commit hook failed

From: David Chapman <dcchapman_at_acm.org>
Date: Sun, 31 Jul 2016 20:15:37 -0700

On 7/31/2016 2:30 PM, Patrik Jonsson wrote:
> Hi all,
> I've been banging my head against this problem for a day and I need
> some help. We recently updated the machine hosting our svn repo, and
> this broke commits using svn+ssh. Here's the setup:
> * Machine runs debian 3.16.7, svn 1.8.10.
> * svn runs as user "www-data" (the apache user).
> * svn+ssh access uses a forced ssh command which sudos to the
> www-data user and executes an svnserve wrapper.
> * svnserve wrapper sets umask to 022 and then executes "svnserve -t"
> with a specific tunnel user.
> This setup is identical to what it was on the old machine. However,
> there must be something different about it, because now https commits
> work fine, but the svn+ssh commits give the error:
> Transmitting file data .svn: E165001: Commit failed (details follow):
> svn: E165001: Commit blocked by pre-commit hook (exit code 255) with
> no output.
> If I access the repository directly using file:// and sudo to the
> www-data user when executing svn, commits work fine. This, in
> combination with the fact that https access works, makes me conclude
> it is not a permissions or hook problem on any of the files since all
> these access methods run as the www-data user. Nevertheless, the error
> comes from the hook, because if I remove the hook file completely, the
> failure moves to the post-commit hook.
> It's not a problem finding !#/bin/sh either, because I tried replacing
> the hook with a compiled C program that just returns 1, and I still
> got the 255 return code.
> When I attempt to commit, I can see successful authentication in the
> syslog, like:
> sudo: <user> : TTY=unknown ; PWD=/home/<user> ; USER=www-data ;
> GROUP=www-data ; COMMAND=/usr/local/bin/svnserve-wrapper
> sudo: pam_unix(sudo:session): session opened for user www-data by (uid=0)
> sshd[26903]: Received disconnect from <ip>: 11: disconnected by user
> sshd[26897]: pam_unix(sshd:session): session closed for user <user>
> The svnserve log file gets this (the name of the repo here is "test")
> <user> test open 2 cap=(edit-pipeline svndiff1 absent-entries depth
> mergeinfo log-revprops) / SVN/1.8.10%20(x86_64-pc-linux-gnu) -
> and then nothing. (I don't know what the "open" command does, it's not
> included in the list of commands on e.g.
> http://svnbook.red-bean.com/en/1.8/svn.serverconfig.operational-logging.html)
> I've seen some similar reports of this, but no suggestions apart from
> permissions or corrupted hook files, which this can't be. I don't even
> know how to proceed with debugging this. Is it possible to see what
> svnserve attempts to do with the hook file? Since it's spawned on
> demand, I don't know how to attach to it with a debugger, or where in
> the source code this error originates.
> Any ideas would be much appreciated,
> Regards,
> /Patrik J.

Is SELinux enabled on the new server? I've seen some oddball permission
problems result when upgrading Linux systems if SELinux is enabled on
the new server but not the old. I don't use svnserve, so I can't offer
specific advice other than the security context in which the new user
runs may be different than that of svnserve, and SELinux may be blocking
it. On Red Hat/CentOS, you would look in "/var/log/audit/audit.log" for
signs of trouble. I don't know if that is the location of the SELinux
log files under Debian.

In particular, watch out for files (scripts, configuration files) copied
directly from an older server without SELinux into a new server with
SELinux. They don't get a context appropriate to the directory in which
you put them. I use Apache, and I had to track down these files
afterward and fix them one by one - very painful. This isn't just a
Subversion problem but is a general Apache problem.

If you do have SELinux running, a quick way to determine whether you
have a security context problem is to turn SELinux off briefly.

     David Chapman      dcchapman_at_acm.org
     Chapman Consulting -- San Jose, CA
     Software Development Done Right.
Received on 2016-08-01 05:42:29 CEST

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