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I see that my /dev/sg0, /dev/sg1, /dev/sg2 are created on each boot with their group as root. However, my /etc/udev/rules.d/udev.rules has these lines in it:
# permissions for SCSI CD devices
BUS=="scsi", KERNEL=="sr[0-9]*", SYSFS{type}=="5", NAME="scd%n",GROUP="optical"
BUS=="scsi", KERNEL=="sg[0-9]*", SYSFS{type}=="5", NAME="%k", GROUP="optical"What might I be doing wrong here? The first time after each boot that I run kb3, I have to manually set the group for these devices to optical so I can write to a CD.
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what type does your /sys report on these devices?
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what type does your /sys report on these devices?
How do I find that info? I do know that this used to work fine with Arch, and don't remember which upgrade caused this problem.
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what type does your /sys report on these devices?
Oh, I think this is what you want. Here's a line from dmesg:
sr 3:0:0:0: Attached scsi generic sg3 type 5sd 2:0:6:0: Attached scsi generic sg2 type 0Offline
what modules are loaded?
sr_mod and sg?
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what modules are loaded?
sr_mod and sg?
Both of those are loaded.
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what does udevtest /block/<yourdevicenode> show?
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what does udevtest /block/<yourdevicenode> show?
I'll have to test this when I get back from the office. For now I rely on rc.local to reset the groups for those devices.
How do I determine my device node?
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well i don't know how they are called, i guess it's sr or something like that.
check if it's listed in /sys/block
then use my command, it will show you what udev does to that node.
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I have no idea what I'm looking at in
/sys/block/sr0Nothing there that sounds like a node or a device node. My rc.local should do the trick for me for now, though.
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i mean is there /sys/block/sr0?
if yes run udevtest /block/sr0
then you get all invfo from udev what it does to the node.
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Okay. Here goes:
[ralvy@tux ~]$ udevtest /block/sr0
main: looking at device '/block/sr0' from subsystem 'block'
udev_make_node: mknod(/dev/.tmp-11-0, 060600, 11, 0) failed: Permission denied
run_program: '/sbin/cdrom_id --export /dev/.tmp-11-0'
run_program: '/sbin/cdrom_id' returned with status 1
udev_rules_get_name: rule applied, 'sr0' becomes 'scd0'
unlink_secure: chown(/dev/.tmp-11-0, 0, 0) failed: No such file or directory
unlink_secure: chmod(/dev/.tmp-11-0, 0000) failed: No such file or directory
create_node: creating device node '/dev/scd0', major = '11', minor = '0', mode = '0660', uid = '0', gid = '93'
main: run: 'socket:/org/freedesktop/hal/udev_event'
main: run: '/lib/udev/cdsymlinks.sh'
main: run: 'socket:/org/kernel/udev/monitor'Offline
ok your device is scd and has correct permissions on optical, gid=93
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ok your device is scd and has correct permissions on optical, gid=93
Hmmm...but when I run k3b, and ask it to burn a CD, and I don't have sg[0-3] set to gid=93, I'm told
cdrecord has no permissions to open the deviceIf I then set those devices to gid=93, k3b stops complaining and writes the image. So scd having gid=93 is never enough by itself.
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then do the same for sg device run udevtest on it it will tell you more.
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Well, that's what's odd. There's no sg device in /sys/block. I think this is beyond me. For now, using rc.local to reset sg[0-2] permissions to gid=93 works okay. Arch seems to set sg3 to gid=93 without my having to change it with rc.local.
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