On Sun, 14 Oct 2001 00:58, Greg Ward wrote:
> I'm a little unclear on the regex syntax used in devfsd.conf. Or
> rather, parentheses don't seem to be working for me, and I'm not sure if
> it's my thick-headedness, inadequated docs, a real honest-to-goodness
> bug.
>
> Here's what I'm trying to do: whenever a "scsi/.*/cd" device is
> registered, change the corresponding "generic" device to group "cdrom",
> group writeable. I would have *thought* that this would do the trick:
>
> REGISTER ^(scsi/.*/)cd$ EXECUTE chgrp cdrom \1/generic
> REGISTER ^(scsi/.*/)cd$ EXECUTE chmod 660 \1/generic
>
> In fact, the Debian packaging of devfsd ships with an /etc/devfs/perms
> that does basically this.
That was a mistake, I don't think I ever uploaded that version to Debian, I
hope that was only a test version.
Devfsd only uses basic regular expressions. I have been thinking of enabling
extended regex compilation, but have been hesitant to allow Debian users to
create config files that won't work anywhere else...
> REGISTER ^scsi/host1/.*/cd$ EXECUTE chgrp cdrom
> scsi/host1/bus0/target0/lun0/generic REGISTER ^scsi/host1/.*/cd$ EXECUTE
> chmod 660 scsi/host1/bus0/target0/lun0/generic
>
> ...it works fine. That's gross, because it assumes my "SCSI" CD-ROM
> (actually an IDE drive that is occasionally under the control of
> ide-scsi) is always in the same place. I don't like assumptions like
> that -- they seem counter to the spirit of devfs.
You could use the following (default for the next Debian package):
REGISTER ^ide/.*/cd$ PERMISSIONS root.cdrom 0660
REGISTER ^scsi/.*/cd$ PERMISSIONS root.cdrom 0660
REGISTER ^ide/.*/disc$ PERMISSIONS root.disk 0660
REGISTER ^ide/.*/part[0-9]*$ PERMISSIONS root.disk 0660
REGISTER ^scsi/.*/disc$ PERMISSIONS root.disk 0660
REGISTER ^scsi/.*/part[0-9]*$ PERMISSIONS root.disk 0660
REGISTER ^cciss/.* PERMISSIONS root.disk 0660
> Can someone tell me what the heck is wrong with my regexes-with-parens
> above? This is with kernel 2.4.12 and/or 2.4.10 (I've been bouncing
> back and forth, I can't remember exactly what happened under which
> kernel). Debian "woody", devfsd 1.3.18-3.
Kernel version doesn't matter for these things (as long as the kernel isn't
inherantly buggy in this regard).
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