Date: Wed, 18 Oct 2006 11:26:19 +0100 From: Ceri Davies <ceri@submonkey.net> To: Yar Tikhiy <yar@comp.chem.msu.su> Cc: Maxime Henrion <mux@FreeBSD.org>, cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org, Andrzej Tobola <ato@iem.pw.edu.pl> Subject: Re: cvs commit: src/etc/rc.d cleartmp Message-ID: <20061018102619.GE92966@submonkey.net> In-Reply-To: <20061017214655.GC75464@comp.chem.msu.su> References: <200610161301.k9GD1j0C074012@repoman.freebsd.org> <20061017173133.GD70184@comp.chem.msu.su> <20061017210527.GD92966@submonkey.net> <20061017214655.GC75464@comp.chem.msu.su>
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On Wed, Oct 18, 2006 at 01:46:55AM +0400, Yar Tikhiy wrote:
> On Tue, Oct 17, 2006 at 10:05:28PM +0100, Ceri Davies wrote:
> > On Tue, Oct 17, 2006 at 09:31:33PM +0400, Yar Tikhiy wrote:
> > > On Mon, Oct 16, 2006 at 01:01:45PM +0000, Yar Tikhiy wrote:
> > > > yar 2006-10-16 13:01:45 UTC
> > > >=20
> > > > FreeBSD src repository
> > > >=20
> > > > Modified files:
> > > > etc/rc.d cleartmp=20
> > > > Log:
> > > > Improve cleartmp in a number of aspects:
> > > > =20
> > > > + Use rc.subr(8) features properly.
> > > > + Do the whole job of obliterating /tmp contents in find(1).
> > > > + Leave lost+found and quota.{user,group} in /tmp only if root-ow=
ned.
> > > > + Make the overall structure clearer by first removing the X dirs
> > > > (perhaps along with the rest of /tmp) and then re-creating them.
> > > > + Use "find -exec rm -rf {} +" for efficiency: each rm instance g=
ets
> > > > a chance to kill as much files in /tmp as ARG_MAX permits.
> > >=20
> > > I was asked a few times why "-prune -exec rm -rf" had been chosen
> > > over "-delete". My initial reason was that -delete would keep
> > > bogus lost+found and quota.{user,group} entries found in subdirs
> > > of /tmp. Well, on second thought, the find command line can be
> > > tweaked so that -delete works as wanted. E.g.:
> > >=20
> > > cd /tmp && find -x . ! -name . \
> > > ! \( -path ./lost+found -type d -user root \) \
> > > ! \( \( -path ./quota.user -or -path ./quota.grou=
p \) \
> > > -type f -user root \) \
> > > -delete
<snip>
> > Given that we're deleting everything anyway, wouldn't it be possible to
> > remove quota.{group,user} regardless and let quotacheck recreate them if
> > required? This shouldn't take too long since there won't be much there.
>=20
> I haven't used quotas for quite a while, but I used to believe that
> administrative limits were stored in those files, too, not only
> current usage values. Therefore quotas on /tmp usage would be
> effectively cancelled after a reboot if we just removed the files.
Sorry, of course you're right.
> > Also, if X requires certain directories, wouldn't it be better to blow
> > them away here and have them created from a boot time script? Otherwise
> > I don't understand how they ever get created.
<snip>
> Oh, perhaps it isn't clear that this script is controlled by two
> partially independent rc.conf vars, clear_tmp_enable and clear_tmp_X.
> Their defaults are NO and YES, respectively. In this mode, cleartmp
> removes only the X dirs from /tmp and then creates them. If the
> settings are YES and YES, it removes all from /tmp (except a few)
> and then creates the X dirs. For YES and NO, it just purges all
> junk from /tmp and creates nothing.
Ah hah.
Ceri
--=20
That must be wonderful! I don't understand it at all.
-- Moliere
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