[systemd-devel] PrivateTmp and systemd-tmpfiles

[Lennart Poettering]

On Wed, 17.10.12 14:16, Lukáš Nykrýn (lnykryn at redhat.com) wrote:

> Hello,
> Today I have read this bug
> https://bugzilla.redhat.com/show_bug.cgi?id=866693 and described
> systemd-tmpfiles behavior look pretty wrong to me, but I am not sure how
> to fix it. Some ideas cross my mind; moving systemd-namespace-*
> elsewhere, adding some option to exclude dirs in tmpfiles conf files,
> stop cleaning /tmp, hardcode some excludes to tmpfiles, but I don't like
> any of these solutions.

We already allow files to be excluded from clean up by setting the
sticky bit on them. We can't do that for dirs however, since the sticky
bit for dirs has a different meaning. One possible way to solve this
issue otherwise might be by introducing an xattr for this. The one thing
blocking this right now however is that tmpfs still can't handle xattrs
properly. There were multiple attempts to get xattrs for tmpfs into the
kernel, not sure what the latest state on this is.

The best would probably be to exclude these dirs from clean-up via
explicit tmpfiles lines. Unfortunately "x" is probably not going to do
it here, since we actually want recursive clean-up inside the dir, just
not of the dir... So maybe introduce a new type of "X" that excludes the
dir itself from clean-up but does not exclude recursively?

Lennart

-- 
Lennart Poettering - Red Hat, Inc.