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Re: Origin of /var/run contents

On Tue, 27 Feb 2018, Gene Heskett wrote:
> Just curious Sven. Why was this not supplied as a manpage or
> something, as far back as wheezy?

It's pretty common knowledge that initscripts and systemd units which
don't run as root have to create temporary directories in /run to track
their pid files and sockets before they drop permissions.

> Didn't anyone think of the stuff that runs as a user?

Stuff that runs as a user should use that user's home directory. [I have
a ~/var/ for this purpose, but other things use environmental variables
or ~/.something/foopid or similar.]

On Tue, 27 Feb 2018, Gene Heskett wrote:
> Neither jessie nor stretch have a manpage for systemd.tmpfiles.

It's systemd-tmpfiles(8) and tmpfiles.d(5).

> And how does that work when /run is a link to /var/run? and it doesn't
> work thru links. Confusing without a lot more study.

It's the other way around. /var/run should be a symlink to /run, which
is a temporary filesystem which goes away on reboot. [It's this way
because /var is sometimes a separate filesystem, and pid files need to
be written at early boot before /var is mounted.]

On Tue, 27 Feb 2018, Gene Heskett wrote:
> I have no clue why the /log and /run directory's are root only, but
> its for sure a PITA. And the "genius" who decreed that has yet to
> surface and offer an explanation.

They're root only because otherwise someone could write 1 to something
like /run/apache2/apache2.pid and watch as your apache2 init script tried to
kill off init. Or something more original and evil.

Don Armstrong                      https://www.donarmstrong.com

[M]en and nations do behave wisely once they have exhausted all other
 -- Abba Ebban