Re: Changes In udev?

To: debian-user@lists.debian.org
Subject: Re: Changes In udev?
From: "Thomas H. George" <lists@tomgeorge.info>
Date: Sat, 19 May 2012 13:12:49 -0400
Message-id: <[🔎] 20120519171249.GA9552@tomgeorge.info>
Mail-followup-to: debian-user@lists.debian.org
In-reply-to: <[🔎] jp8ek1$27j$17@dough.gmane.org>
References: <[🔎] 20120519150402.GA9110@tomgeorge.info> <[🔎] jp8ek1$27j$17@dough.gmane.org>

On Sat, May 19, 2012 at 03:35:29PM +0000, Camaleón wrote:
> On Sat, 19 May 2012 11:04:02 -0400, Thomas H. George wrote:
> 
> > In /dev cdrom4, cdrw4, dvd4 and dvdrw4 all point to sr1 and cdrom6,
> > cdrw6, dvd6 and dvdrw6 all point to sr0
> > 
> > I just replaced a dying motherboard - the ethernet circuit failed - and
> > on boot up found the above soft links.  Perhaps this was changed in a
> > recent dist-upgrade and I only now noticed the changes.  Either way my
> > /dev/fstab file was out of date as it contained entries like
> > 
> > /dev/sca1	/media/cdrom1	udf,iso9660	user,noauto	0	0
> > 
> > so my dvdrw drives were not found.
> 
> Are you running squeeze, wheehy, sid?

Wheezy

> 
> How many optical devices do you have, two (CD → sr1 and DVD → sr0)? You 
> can run "dmesg | grep sr" and send the output.
> 
> (...)

[    1.802349] sr0: scsi3-mmc drive: 48x/48x writer dvd-ram cd/rw xa/form2 cdda tray
[    1.802964] sr 5:0:0:0: Attached scsi CD-ROM sr0
[    2.936691] sr1: scsi3-mmc drive: 32x/32x writer cd/rw xa/form2 cdda tray
[    2.936900] sr 6:0:0:0: Attached scsi CD-ROM sr1

The dvdrw is a sata drive and the cdrw is a usb drive

> > changes in /dev?
> 
> You can try with:
> 
> /dev/cdrom /media/cdrom0 udf,iso9660 user,noauto 0 0
> /dev/dvd /media/dvd0 udf,iso9660 user,noauto 0 0
> 

The problem is that udev has chosen to link cdrom4 to sr1 and to link
dvdrw6 to sr0 so there are no /dev/cdrom /dev/dvd entries.

> Note that "/dev/cdrom" and "/dev/dvd" are the names udev gives to your 
> devices based on the content of "/etc/udev/rules.d/70-persistent-
> cdrom.rules" file.

Now that you direct me to the content of the
/etc/udev/rules.d/70-persistent-cdrom.rules file (attached below) it is
clear why the assignments cdrom4 and dvdrw6 were made but
where did all the extra entries in this file come from?  Can I just
delete them?  Will they be regenrated by future updates?


# 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.

# DRW-2014L1T (pci-0000:00:05.0-scsi-1:0:0:0)
ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:05.0-scsi-1:0:0:0", SYMLINK+="cdrom", ENV{GENERATED}="1"
ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:05.0-scsi-1:0:0:0", SYMLINK+="cdrw", ENV{GENERATED}="1"
ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:05.0-scsi-1:0:0:0", SYMLINK+="dvd", ENV{GENERATED}="1"
ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:05.0-scsi-1:0:0:0", SYMLINK+="dvdrw", ENV{GENERATED}="1"
# DRX-510UL (pci-0000:00:02.1-usb-0:1:1.0-scsi-0:0:0:0)
ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:02.1-usb-0:1:1.0-scsi-0:0:0:0", SYMLINK+="cdrom1", ENV{GENERATED}="1"
ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:02.1-usb-0:1:1.0-scsi-0:0:0:0", SYMLINK+="cdrw1", ENV{GENERATED}="1"
ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:02.1-usb-0:1:1.0-scsi-0:0:0:0", SYMLINK+="dvd1", ENV{GENERATED}="1"
ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:02.1-usb-0:1:1.0-scsi-0:0:0:0", SYMLINK+="dvdrw1", ENV{GENERATED}="1"
# DRX-510UL (pci-0000:00:02.1-usb-0:1:1.0-scsi-0:0:0:0)
ENV{ID_CDROM}=="?*", ENV{ID_SERIAL}=="Sony_DRX-510UL_DRX-510UL_SYQ013324", SYMLINK+="cdrom2", ENV{GENERATED}="1"
ENV{ID_CDROM}=="?*", ENV{ID_SERIAL}=="Sony_DRX-510UL_DRX-510UL_SYQ013324", SYMLINK+="cdrw2", ENV{GENERATED}="1"
ENV{ID_CDROM}=="?*", ENV{ID_SERIAL}=="Sony_DRX-510UL_DRX-510UL_SYQ013324", SYMLINK+="dvd2", ENV{GENERATED}="1"
ENV{ID_CDROM}=="?*", ENV{ID_SERIAL}=="Sony_DRX-510UL_DRX-510UL_SYQ013324", SYMLINK+="dvdrw2", ENV{GENERATED}="1"
# Cruzer (pci-0000:00:02.1-usb-0:2:1.0-scsi-0:0:0:1)
ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:02.1-usb-0:2:1.0-scsi-0:0:0:1", SYMLINK+="cdrom", ENV{GENERATED}="1"
# Cruzer (pci-0000:00:02.1-usb-0:2:1.0-scsi-0:0:0:1)
ENV{ID_CDROM}=="?*", ENV{ID_SERIAL}=="SanDisk_Cruzer_08778113C0C349E1-0:1", SYMLINK+="cdrom", ENV{GENERATED}="1"
# DVD_RW_DRU-510A (pci-0000:00:02.0-usb-0:1:1.0-scsi-0:0:0:0)
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:02.0-usb-0:1:1.0-scsi-0:0:0:0", SYMLINK+="cdrom3", ENV{GENERATED}="1"
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:02.0-usb-0:1:1.0-scsi-0:0:0:0", SYMLINK+="cdrw3", ENV{GENERATED}="1"
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:02.0-usb-0:1:1.0-scsi-0:0:0:0", SYMLINK+="dvd3", ENV{GENERATED}="1"
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:02.0-usb-0:1:1.0-scsi-0:0:0:0", SYMLINK+="dvdrw3", ENV{GENERATED}="1"

# DVD_RW_DRU-510A (pci-0000:00:02.0-usb-0:1:1.0-scsi-0:0:0:0)
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_SERIAL}=="SONY_DVD_RW_DRU-510A_DRX-510UL_SYQ013324-0:0", SYMLINK+="cdrom4", ENV{GENERATED}="1"
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_SERIAL}=="SONY_DVD_RW_DRU-510A_DRX-510UL_SYQ013324-0:0", SYMLINK+="cdrw4", ENV{GENERATED}="1"
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_SERIAL}=="SONY_DVD_RW_DRU-510A_DRX-510UL_SYQ013324-0:0", SYMLINK+="dvd4", ENV{GENERATED}="1"
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_SERIAL}=="SONY_DVD_RW_DRU-510A_DRX-510UL_SYQ013324-0:0", SYMLINK+="dvdrw4", ENV{GENERATED}="1"

# DRW-2014L1T (pci-0000:00:05.0-scsi-3:0:0:0)
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:05.0-scsi-3:0:0:0", SYMLINK+="cdrom5", ENV{GENERATED}="1"
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:05.0-scsi-3:0:0:0", SYMLINK+="cdrw5", ENV{GENERATED}="1"
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:05.0-scsi-3:0:0:0", SYMLINK+="dvd5", ENV{GENERATED}="1"
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:05.0-scsi-3:0:0:0", SYMLINK+="dvdrw5", ENV{GENERATED}="1"

# ASUS_DRW-2014L1T (pci-0000:00:14.1-scsi-1:0:0:0)
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:14.1-scsi-1:0:0:0", SYMLINK+="cdrom6", ENV{GENERATED}="1"
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:14.1-scsi-1:0:0:0", SYMLINK+="cdrw6", ENV{GENERATED}="1"
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:14.1-scsi-1:0:0:0", SYMLINK+="dvd6", ENV{GENERATED}="1"
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:14.1-scsi-1:0:0:0", SYMLINK+="dvdrw6", ENV{GENERATED}="1"

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Follow-Ups:
- Re: Changes In udev?
  - From: Camaleón <noelamac@gmail.com>

References:
- Changes In udev?
  - From: "Thomas H. George" <lists@tomgeorge.info>
- Re: Changes In udev?
  - From: Camaleón <noelamac@gmail.com>

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