On Wed, 2008-01-23 at 08:19 +0800, Joe Morris (NTM) wrote:
> On 01/22/2008 07:32 PM, Juergen Weigert wrote:
> > I have attempted
> > /etc/udev/rules.d/99-cdrom.conf
> >
> > containing:
> >
> > KERNEL=="dvd1" SYMLINK="cdrom", MODE="666"
> > OPTIONS="last_rule"
> >
> > udev happily ignores this rule.
> > I'd expect to get a /dev/cdrom symlink.
> > But nothing is created, even after reboot.
> > Any hints how to debug?
> >
> >
> It is controlled by 60-cdrom_id.rules, which calls a program called
> cdrom_id, and 70-persistent-cd.rules contains the rules created by the
> write_cd_rules script. For example, mine is:
> # This file was automatically generated by the /lib/udev/write_cd_rules
> # program, probably run by the cd-aliases-generator.rules rules file.
> #
> # You can modify it, as long as you keep each rule on a single line
> # and set the $GENERATED variable.
>
> # DVD_RW_ND-3520AW (pci-0000:00:0f.1-scsi-1:0:0:0)
> ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:0f.1-scsi-1:0:0:0",
> SYMLINK+="cdrom", ENV{GENERATED}="1"
> ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:0f.1-scsi-1:0:0:0",
> SYMLINK+="cdrw", ENV{GENERATED}="1"
> ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:0f.1-scsi-1:0:0:0",
> SYMLINK+="dvd", ENV{GENERATED}="1"
> ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:0f.1-scsi-1:0:0:0",
> SYMLINK+="dvdrw", ENV{GENERATED}="1"
The rules files are read alphabetically. Or, numerically, in fact. The
number at the beginning controls the order the rules are added. If there
is no last_rule directive, udev appends each appropriate rule in the
order the rules files are read. So one need not modify this file as it
contains no last_rule directives. Just add a rule that will be read in
later that does what is wanted. In this case, the name of the rule file
should be > 60.
The trick here is finding what rules are consulted for each device. The
udevmonitor program is nice for pluggable devices. I have never been
able to find an easy human usable method to get the same info for static
devices, like a built-in cd drive.
--
Roger Oberholtzer
OPQ Systems / Ramböll RST
Ramböll Sverige AB
Kapellgränd 7
P.O. Box 4205
SE-102 65 Stockholm, Sweden
Office: Int +46 8-615 60 20
Mobile: Int +46 70-815 1696
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