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[Nick Rosbrook <2069834@xxxxxxxxxxxxxxxxxx>]

I think option (2) is the probably the "best" fix. Another alternative I
can think of is shipping a tmp.mount drop-in on the autopkgtest
environment to change the size to something better. E.g.,

# /etc/systemd/system/tmp.mount.d/size.conf
[Mount]
Options=size=<param>

where <param> could be a percentage of RAM (e.g. 75%%), or an explicit
size (e.g. 4GB). But then again, these defaults are intentionally easy
to override. If the autopkgtest environment wants to do something
different, I don't think it's the end of the world, and masking
tmp.mount as a first step is fine.

> This under the assumption that the switch to a tmpfs has been
discussed, and we want it in Ubuntu.

This was discussed in the foundations team, and the initial consensus
was to not deviate from upstream and Debian.

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https://bugs.launchpad.net/bugs/2069834

Title:
  systemd defaulting to tmpfs for /tmp causes enospc errors

Status in Auto Package Testing:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  Debian systemd now mounts a tmpfs on /tmp by default; relevant
  d/changelog entry:

  systemd (256~rc3-3) unstable; urgency=medium

     * Make /tmp/ a tmpfs by default. Restore the upstream default and make
      /tmp/ a tmpfs. Can be overridden with: touch
      /etc/systemd/system/tmp.mount or: systemctl mask tmp.mount

  Ubuntu is aligning to this, however this means that available space
  under /tmp is limited to the half of the available ram. That is
  sometimes not enough to unpack source trees in /tmp, see for example
  [1].

  We need to to decide how to deal with this. Possibilities I can think
  about:

  1. Disable the tmpfs tmp.mount, as suggested in the d/changelog entry.
  To be done in setup-testbed. Good: easy. Bad: deviates from the Ubuntu
  defaults, requires rebuilding the images.

  2. Make autopkgtest use /var/tmp. Good: we stick to the defaults: Bad:
  requires non trivial changes in src:autopkgtest, which makes
  assumptions on stuff being in /tmp, on /tmp being cleared on reboots,
  ...

  This under the assumption that the switch to a tmpfs has been
  discussed, and we want it in Ubuntu.

  [1] https://autopkgtest.ubuntu.com/results/autopkgtest-
  oracular/oracular/ppc64el/c/ceph/20240618_194813_d6efc@/log.gz

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