[Koha-bugs] [Bug 13431] Shared FastMmap file causes issues

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

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=13431

--- Comment #4 from Jacek Ablewicz <ablewicz at gmail.com> ---
Created attachment 34321
  -->
http://bugs.koha-community.org/bugzilla3/attachment.cgi?id=34321&action=edit
Bug 13431 - Shared FastMmap file causes issues

Koha::Cache package does not take into account that, when using
fastmmap caching variant, mmaped cache file created in /tmp
(typically: /tmp/sharefile-koha-koha), would only be
further accessible to the one given OS user - the one which
created it.
In many Koha setups, in the circumstances when various system scripts
are executed by 2+ users with diffrent UIDs (like multi-tenant servers,
for example) this may cause many kinds of issues. Observable symptom
is usually the appearance of the below error when searching, or looking
at MARC Framework pages and a few other places:

Open of share file /tmp/sharefile-koha-koha failed: Permission denied
at /usr/lib/perl5/Cache/FastMmap.pm line 640.

This patch adds the ID of the OS user to the mmaped file name created
in /tmp, to prevent such kinds of conflicts and/or permission problems
from happening.

To test:

1) remove the /tmp/sharefile-koha-* file[s] (if any)
2) do something which would lead to its re-creation
(e.g., performing any search in OPAC should be sufficient
to cause that)
3) observe that /tmp/sharefile-koha-koha got created
4) remove it
5) apply patch
6) redo step 2)
7) observe that file created in /tmp now does have
the OS user id included in it's name (e.g. it would be named
like that 'sharefile-koha-koha-www-data' - depending on the
particular test setup)
8) add some additional user to the /etc/passwd, with the same
UID www-data has, but with different name (e.g. 'www-data2'); redo
the tests; ensure that it still works fine in such unusual case

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