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I have a webserver with a git repo containing a website. I have made a CMS using PHP where PHP automatically commits to git when files are changed. I would like to track these commits (preferably in a form close to git log --name-status to show added/deleted files) using Logwatch. I have read about creating custom Logwatch services, but Logwatch is all really new to me and that didn't really get me anywhere.

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Note: Instead of the PHP code below, if you wanted to track all git commits (and not only those committed using PHP), it should be possible to set up a post-commit hook with similar output.


Just after writing the question I came across this really simple guide. Based on that, here's what I did:

Create log directory and set permissions

I haven't tested this without setting permissions, but I assume it's needed.

sudo mkdir /var/log/gitweb
sudo chown: www-data /var/log/gitweb

PHP git log function

This line of code is run whenever I run git commit in the php code. Newlines are replaced with a custom string so that each commit is on its own line (as far as I know, Logwatch can only operate on a line-by-line basis). This will be replaced back with newlines when parsing with Logwatch.

shell_exec('(git log -1 --date=iso --name-status | awk 1 ORS="[NEWLINE_HERE]" ; echo) >> /var/log/gitweb/gitweb.log');

Logwatch log file group

# /etc/logwatch/conf/logfiles/gitweb.conf

LogFile = gitweb/*.log
Archive = gitweb/*.gz
*ExpandRepeats

Not really sure what *ExpandRepeats does, but it was in the guide I linked to.

Logwatch service

# /etc/logwatch/conf/services/gitweb.conf

Title = "Git commits"
LogFile = gitweb

Logwatch parser

This does two things:

  • Time filtering (it only prints lines/commits with the correct date)
  • Convert custrom string back to newlines (see the PHP code above)

I know absolutely zero perl (I looked at other Logwatch scripts for help), so I apologize if this is a sacrilege against all things perl-y.

use Logwatch ':dates';

my $filter = TimeFilter('%Y-%m-%d %H:%M:%S');

while (defined(my $ThisLine = <STDIN>)) {
   if ($ThisLine =~ /$filter/) {
      $ThisLine =~ s/\[NEWLINE_HERE\]/\n/g;
      print $ThisLine;
   }
}

exit(0);

Set up log rotation

# /etc/logrotate.d/gitweb

/var/log/gitweb/*log {

    daily

    # keep 10 old logs
    rotate 10

    # don't do anything if the log is missing
    missingok

    # don't do anything if the log is empty
    notifempty

    # zip the archived logs
    compress
}

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