[systemd-devel] binding tmpfiles.d to unit startup

[Colin Walters]

On Sat, Mar 1, 2014 at 2:18 PM, Tom Gundersen <teg at jklm.no> wrote:
> And a bit further down that thread there was this proposal from Lennar
> (which doesn't seem far from what Colin wants):
> <http://lists.freedesktop.org/archives/systemd-devel/2013-July/012024.html>.
> 
Right...so rereading that, the discussion seemed to peter out after: 
http://lists.freedesktop.org/archives/systemd-devel/2013-July/012090.html

I see Michael's point here as well:
http://lists.freedesktop.org/archives/systemd-devel/2013-July/012037.html

Certainly it magnifies the pain for the RPM world in that there's 
nothing that scans the build directory and says "hey you installed 
something that looks like a tmpfiles.d snippet, let me auto-generate 
some postinst shell script".

I think any postinsts like this are still pretty ugly though.  It means 
the directories are created when the daemon is *installed*, not when 
it's run.  Which is odd and against the generally dynamic nature of 
systemd.

Also, running shell script as root is just full of fail, sorry package 
people =)  Even if it's auto-generated from a centrally maintained 
place.

I admit this is sometimes what you want, e.g. if you need a way to 
install postgres and then restore a dump file from backup *before* 
starting it.  Those cases could be covered of course by an 
administrator doing a mkdir manually and if they're careful about 
SELinux, using restorecon.

So basically here'd what I'd propose, which is an extension of 
Lennart's:

RuntimeDirectory=/run/mydaemon
PersistentStateDirectory=/var/lib/mydaemon

We could cover a lot of simple cases with that - default to being owned 
by User= and mode 0700, and have RuntimeDirectoryMode= and 
PersistentStateDirectoryMode= to override that last bit.

Note - the previous discussion seemed largely about /run, but I am most 
interested in real permanent directories in /var.

The primary goal again for me is that I can rm -rf /var/* and reboot, 
and have the system be clean.


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