From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Schweizer <sschweizer@gmail.com>
Date: Wed, 10 Nov 2004 23:25:26 +0000
Subject: Re: udev and cdrom permissions
Message-Id: <e796392204111015256dec966a@mail.gmail.com>
List-Id: <linux-hotplug.vger.kernel.org>
References: <e796392204111014024814f58@mail.gmail.com>
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To: linux-hotplug@vger.kernel.org

On Wed, 10 Nov 2004 23:10:49 +0100, Marco d'Itri <md@linux.it> wrote:
> md@wonderland:~$cat /etc/udev/simple-cd-aliases.rules
> # grouping of optical drives from multiple kernel subsystems
> KERNEL="sr*",     NAME="%k", SYMLINK="cdrom%e"
> KERNEL="scd*",    NAME="%k", SYMLINK="cdrom%e"
> KERNEL="pcd*",    NAME="%k", SYMLINK="cdrom%e"
> KERNEL="hd[a-z]", NAME="%k", SYMLINK="cdrom%e", PROGRAM="/bin/cat /proc/ide/%k/media", RESULT="cdrom"
> 
> md@wonderland:~$
> 
> Just add GROUP statements.


This is a very good idea. ide-devfs.sh should be modified to also
produce GROUP= output.
And of course the default rule to also contain the GROUP= statement,
calculated by ide-devfs.sh.





Change needed to make this work:



--- namedev.c.orig      2004-11-11 00:22:11.646609480 +0100
+++ namedev.c   2004-11-11 00:23:24.228575344 +0100
@@ -785,6 +785,11 @@
                goto done;
 
        udev->partitions = dev->partitions;
+       if (dev->group[0] != '\0') {
+               strfieldcpy(udev->group, dev->group);
+               apply_format(udev, udev->group, sizeof(udev->group),
class_dev, sysfs_device);
+               
+       }
 
        /* get permissions given in rule */
        set_empty_perms(udev, dev->mode,





in /etc/udev/rules.d/udev.rules:
BUS="ide", KERNEL="hd*", PROGRAM="/etc/udev/scripts/ide-devfs.sh %k %b
%n", NAME="%k", SYMLINK="%c{1} %c{2}", GROUP="%c{3}"


in /etc/udev/scripts/ide-devfs.sh:


                echo ide/host${HOST}/bus${BUS}/target${TARGET}/lun0/cd
cdroms/cdrom`get_dev_number $1 cdrom` cdrom
        elif [ "${MEDIA}" = "floppy" ]; then
                echo
ide/host${HOST}/bus${BUS}/target${TARGET}/lun0/disc
floppies/floppy`get_dev_number $1 floppy`/disc floppy
        elif [ "${MEDIA}" = "disk" ]; then
                echo
ide/host${HOST}/bus${BUS}/target${TARGET}/lun0/disc
discs/disc`get_dev_number $1 disk`/disc disk


(add the type again at the end)


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