Re: Re: Make /tmp/ a tmpfs and cleanup /var/tmp/ on a timer by default [was: Re: systemd: tmpfiles.d not cleaning /var/tmp by default]
On Mon, 6 May 2024 at 23:00, Johannes Schauer Marin Rodrigues
<josch@debian.org> wrote:
>
> Quoting Luca Boccassi (2024-05-06 23:28:59)
> > On Mon, 6 May 2024 at 22:27, Simon McVittie <smcv@debian.org> wrote:
> > >
> > > On Mon, 06 May 2024 at 22:08:56 +0200, Johannes Schauer Marin Rodrigues wrote:
> > > > If [files can be deleted automatically while mmdebstrap is using them],
> > > > how should applications guard against that from
> > > > happening?
> > >
> > > As documented in tmpfiles.d(5), if mmdebstrap takes out an exclusive
> > > flock(2) lock on its chroot's root directory, systemd-tmpfiles should
> > > fail to take out its own lock on the directory during cleanup, and
> > > respond to that by treating the directory as "in use" and skipping it.
> >
> > That also works, but only as long as mmdebootstrap is actually
> > running, and as far as I understand it is not a long-running service,
> > not sure if it works for this use case
>
> I guess those users who want to place their chroots in /tmp would have to
> disable the cleanup timer on their systems.
>
> For the mmdebstrap user who just wants to create some tarballs, I think the
> flock solution would be sufficient, thank you.
>
> > More specific settings win, so your application can ship its own tmpfiles.d
> > snippet that defines a longer (or infinite) cleanup time for directories
> > under /tmp or /var/tmp.
>
> How would that look like? Say, my application creates temporary directories
> with the pattern /tmp/mmdebstrap.XXXXXXXX -- how would the recommended line
> which disables cleanup in /usr/lib/tmpfiles.d/mmdebstrap.conf look like?
To be more specific, as per documentation:
https://www.freedesktop.org/software/systemd/man/latest/tmpfiles.d.html
'x' lines can be used to override cleanup rules, and support globbing,
so something like:
x /tmp/mmdebstrap.*
> And just to confirm (I read this elsewhere in this thread): if my /etc/fstab
> has an entry for /tmp (with a tmpfs) does this automatically mean that no
> cleanup will happen or do i still have to put something into /etc to disable
> the periodic cleanup?
That's something different, fstab is about whether /tmp is a tmpfs or
not, cleanups still happen regardless of the filesystem type.
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