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** Changed in: linux (Ubuntu)
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1043182
Title:
scsi_debug emulated CD does not implement READ_TOC
Status in linux package in Ubuntu:
Won't Fix
Bug description:
cdrom_id does not like the emulated SCSI CD-ROM from scsi_debug. This
is a stopper for writing automatic tests around CDs.
Reproducer:
sudo modprobe scsi_debug
sudo dd if=/tmp/test.iso of=/dev/sdc # check the device!
echo 5 | sudo tee /sys/bus/pseudo/drivers/scsi_debug/ptype
echo 1 | sudo tee /sys/bus/pseudo/drivers/scsi_debug/add_host
You will notice that blkid detects it just fine:
$ sudo blkid -p /dev/sr1
/dev/sr1: VERSION="Joliet Extension" LABEL="CDROM" TYPE="iso9660"
USAGE="filesystem"
but there are no file system properties in udev for the device,
because the udev rules only run blkid for CDs with a recognized medium
(to avoid unintended side effects and hangs):
/lib/udev/rules.d/60-persistent-storage.rules:KERNEL=="sr*",
ENV{DISK_EJECT_REQUEST}!="?*", ENV{ID_CDROM_MEDIA_TRACK_COUNT_DATA}=="?*",
ENV{ID_CDROM_MEDIA_SESSION_LAST_OFFSET}=="?*", IMPORT{program}="/sbin/blkid -o
udev -p -u noraid -O $env{ID_CDROM_MEDIA_SESSION_LAST_OFFSET} $tempnode"
/lib/udev/rules.d/60-persistent-storage.rules:KERNEL=="sr*",
ENV{DISK_EJECT_REQUEST}!="?*", ENV{ID_CDROM_MEDIA_TRACK_COUNT_DATA}=="?*",
ENV{ID_CDROM_MEDIA_SESSION_LAST_OFFSET}=="", IMPORT{program}="/sbin/blkid -o
udev -p -u noraid $tempnode"
However, cdrom_id fails:
$ /lib/udev/cdrom_id --debug /dev/sr1
main: probing: '/dev/sr1'
cd_inquiry: INQUIRY: [Linux ][scsi_debug ][0004]
info_scsi_cmd_err: GET CONFIGURATION failed with SK=5h/ASC=20h/ACQ=00h
cd_profiles: drive is pre-MMC2 and does not support 46h get configuration
command
cd_profiles: trying to work around the problem
info_scsi_cmd_err: READ DISC INFORMATION failed with SK=5h/ASC=20h/ACQ=00h
cd_profiles_old_mmc: no current profile, but disc is present; assuming CD-ROM
info_scsi_cmd_err: READ TOC failed with SK=5h/ASC=20h/ACQ=00h
info_scsi_cmd_err: READ DISC INFORMATION failed with SK=5h/ASC=20h/ACQ=00h
ID_CDROM=1
ID_CDROM_MEDIA=1
ID_CDROM_MEDIA_CD=1
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