El Thu, 26 Jan 2006 19:28:18 +0100,
Olivier Galibert <[email protected]> escribió:
> - find the devices, what should I scan/filter on. udev seems likes it
> needs to run a program (/sbin/cdrom_id) or scan
> /proc/sys/dev/cdrom/info just to know if a device is a cdrom...
Not at all - /sys/devices/pci0000:00/0000:00:0f.1/ide1/1.0/media
tells that in my box. cdrom_id is, AFAICS, a way to find the
capabilities of the drive (ie, look if it's a cdrom or a dvd, etc)
You can get the info even with a fancy output:
root@estel# systool -v -b ide
Bus = "ide"
Device = "0.0"
Device path = "/sys/devices/pci0000:00/0000:00:0f.1/ide0/0.0"
drivename = "hda"
media = "disk"
modalias = "ide:m-disk"
uevent = <store method only>
Device = "1.0"
Device path = "/sys/devices/pci0000:00/0000:00:0f.1/ide1/1.0"
drivename = "hdc"
media = "cdrom"
modalias = "ide:m-cdrom"
uevent = <store method only>
I guess the cdrom driver could in the future be taught to export
more data (the previus cdrom drive is really a dvd drive...) to
the sysfs interface to know if it's a dvd so that cdrom_id is
unnecesary in some cases.
> - find the /dev name associated to a sysfs-found device.
HAL tells you that the sysfs path associated to a device.
root@estel # hal-get-property --udi '/org/freedesktop/Hal/devices/block_HL-DT-ST DVDRAM GSA-4163B-K01544H0250' --key 'block.device'
/dev/cd-rw
root@estel #
(yes, that "udi" path sucks)
> /dev/cdrw*, /dev/dvd*, /dev/dvdrw*. Fedora core 3 creates
> /dev/cdrom*, /dev/cdwriter*, /dev/dvd*, /dev/dvdwriter*. I guess from
> your email that SuSE does /dev/cdrecorder*. And I'm not able to
> guess what fedora core 5, mandrake, debian, slackware and infinite
> number of derivatives do.
Although that sucks, IMO the whole point of udev/hal & friends is to
be able to make programs work regardless of what the name of the device
is (or at least, if I had to use a program, I would like that the program
design is good enought that it just ask the system what cd recorders are
connected to the system).
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