[Koha-bugs] [Bug 23571] Prevent concurrent execution of fines.pl

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=23571

--- Comment #14 from Tomás Cohen Arazi <tomascohen at gmail.com> ---
Created attachment 102772
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=102772&action=edit
[ALTERNATIVE] Bug 23571: Prevent concurrent execution of fines.pl

This patch introduces locking in fines.pl. It does so by leveraging on
bug 25109, which introduces a generic locking implementation on
Koha::Script.

The introduced changes:
1. Try to get the lock
2.a. If success, normal execution happens
2.b. If rejected, cronlogaction is called with a meaningful message and
  a normal exit happens, so we don't flood the logs in vain. --verbose
  will make the script print the same message on STDERR, as already is
  the case with this script

To test:
1. Apply this patch
2. In two separate consoles run:
   $ kshell
  k$ perl misc/cronjobs/fines.pl --verbose
SUCCESS => The first one runs normally, the second one exists really fast
  and prints a message about the lock.
3. Sign off :-D

Sponsored-by: Orex Digital

Signed-off-by: Tomas Cohen Arazi <tomascohen at theke.io>

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