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  • From: Flavien Bridault <f.bridault AT fra.net>
  • To: sm-discuss AT lists.ibiblio.org
  • Subject: Re: [SM-Discuss] GVM works :)
  • Date: Tue, 01 Nov 2005 09:40:00 +0100

Le mardi 01 novembre 2005 à 08:52 +0100, Arwed von Merkatz a écrit :
> On Tue, Oct 18, 2005 at 10:36:57PM +0200, Flavien Bridault wrote:
> [...]
> > > > Correct. :-)
> > > > That's exactly why we switch from a single rules file to a directory
> > > > of
> > > > rules file. Users should have defined their own rules in a file read
> > > > *after* 50-default.rules, so something like 90-mysetup.rules, as
> > > > explained in /etc/udev/rules.d/README :
> > > >
> > > > "The files which name ends in ".rules" will be read by udev in lexical
> > > > order.
> > > > Any others will be ignored.
> > > > There are some example rules in rules.examples, take a look at those
> > > > for
> > > > an idea of what's possible with udev.
> > > >
> > > > When a rule matches in one file, a different rule in another file will
> > > > be
> > > > ignored, so be sure to name your own files properly.
> > >
> > > So 50-default will match before 90-mysetup and so anything duplicated
> > > in 90-mysetup will be ignored?
> > >
> > Well that was what I thought when I read this, but in practice this
> > seems to be the inverse !
> > For example, for cdrtools rules, I first named the file
> > 10-cdrtools.rules, but when I added the new rules, I noticed that only
> > those from 50-default.rules were applied, i.e. the cd recorder belonged
> > to cdrom group and not to burning group. I was quite surprised that it
> > works when I renamed 10-cdrtools to 80-cdrtools. Unless I misunderstood
> > something ?
> > You're right to highlight that point, I would be interested that someone
> > confirm what I just told, and then I should update the README. (And I
> > should have read it completely before pasted it ;-) )
>
> Rules files are read in lexical order, so 10-cdrtools.rules would be
> applied before 50-default.rules. What's making this a little more
> complicated to figure out is that an existing udev rule for a device
> does _not_ stop other rules for that device to be used. So if you have
> two rules setting up permissions for /dev/cdrom, one in each of those
> files the one in 50-default.rules will override the one in
> 10-cdrtools.rules. There are two exceptions to this rule. The first is
> the NAME assignment, only the first assignment like that is used, all
> later ones are ignored. The second is when you make a rule explicitly
> the last one for this device by using OPTIONS=last_rule.
> So basically when you want to override what name a device gets (real
> name, not symlink), you should use something like 00-mine.rules; if you
> want to change permissions or add symlinks you should use 99-mine.rules;
> if you want to completely ignore the smgl rules for a device you should
> put it in 00-mine.rules with OPTIONS=last_rule
> Did that make it a bit clearer? :)
>
That's much more clear, thank you ;-)

--
-- -- -- -- -- -- --
Flavien Bridault
Source Mage GNU/Linux - Disk Section Guru

irc: vlaaad
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