[Koha-bugs] [Bug 19676] New: Debian 9 vs. Plack vs. / tmp -- attention to PrivateTmp for apache2

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

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=19676

            Bug ID: 19676
           Summary: Debian 9 vs. Plack vs. /tmp -- attention to PrivateTmp
                    for apache2
 Change sponsored?: ---
           Product: Koha
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5 - low
         Component: Architecture, internals, and plumbing
          Assignee: koha-bugs at lists.koha-community.org
          Reporter: januszop at gmail.com
        QA Contact: testopia at bugs.koha-community.org

Beware: in Debian 9 apache2 comes with PrivateTmp enabled by default.

As a consequence, there are issues when Plack is enabled for an instance, but
in Koha there is an interaction between Plack enabled and Plack blacklisted
stuff through /tmp directory.

Plack-ed scripts will write temporary files in "real" /tmp directory (as
pointed by Koha::UploadedFile::temporary_directory, i.e. File::Spec->tmpdir)
whereas Plack blacklisted scripts will understand /tmp as private tmp of
apache2, i.e. /tmp/systemd-private-?????????-apache2.service-????/tmp.

This happens for instance for stage-marc-import.pl -- in step 2 the script
won't find the marc file uploaded in step 1.

The simplest instant solution to this would be to disable PrivateTmp for
apache2 (this article gives a clue:
https://www.maxoberberger.net/blog/2017/10/debian-9-private-tmp.html), but
maybe there is a better option?

(When Plack is disabled everything seems to work fine apart of the fact that
the private tmp of apache2 is being used.)

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