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[Kristina Hoeppner <1938347@xxxxxxxxxxxxxxxxxx>]

** Changed in: mahara
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1938347

Title:
  The $cfg->log_file option only writes the last output

Status in Mahara:
  Confirmed

Bug description:
  There is a configuration option in Mahara where you can specify a file
  to save logging to. This is useful if you are wanting to debug
  something but do not have access to the apache/nginx error logs.

  The problem with it though is on every write to the file it deletes the existing data because we open the file with:
    $LOGFILE_FH = fopen($logfilename, 'wb');

  What would be more useful is if the log file remembered existing lines
  of logging for better diagnosis, eg appending new lines to end of
  file.

  We would need to do it in such a way that we didn't end up with one
  giant log file that keeps growing until the server is full.

  My idea is this:

  If you have $cfg->log_file = $cfg->dataroot . '/logs/custom.log';

  On writing to the file check the number of lines existing in the
  custom.log file and once it gets to be more that a certain number, say
  10000 lines, it copies that file to custom.log.old and starts a new
  custom.log file to write to

  That way you only end up with max 2 files of max approx 20000 lines
  and it will be faster than trying to append new lines to base of
  custom.log while removing lines from start of custom.log

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