udev/hotplug success story

[Daniel Drake <dan@reactivated.net>]

Hi Greg,

Thought you might be interested to know that I've got my setup working great 
with udev controlling /dev.

I'm running a gentoo based system, kernel 2.6.2-mm1, udev 016, hotplug 20040105

A few comments:

With the default devfs-like config, udev correctly places a symlink to 
/dev/hdc as /dev/cdroms/cdrom0.
With devfs, I had it setup so that I could also use /dev/dvd there. Writing a 
rule for udev to do that is no problem. I told it to name the device "hdc" and 
SYMLINK "dvd". The only thing there, is that it then overwrote the devfs-like 
rule, and /dev/cdroms/cdrom0 no longer existed. In the end I just added 
another SYMLINK to cdroms/cdrom0, but I was wondering, is there a better way - 
are there rules that I can pass that append SYMLINKs onto other ones?


Hotplug is doing a good job of managing my usb modules. When I plug my camera 
in, it loads usb-storage as expected. However, it doesnt load sd_mod, meaning 
that no /dev/sda1 is created, and I can't access my pictures.

I could easily get around this by writing a script to "modprobe sd_mod", and 
then adding a line to /etc/hotplug/usb.usermap.

To better fit in with the purpose of hotplugging, I would think that this 
module should be loaded automatically after usb-storage. Is this a 
bug/missing-feature, or intentional?


Final comment: I think that the documentation for hotplug is a little lacking. 
In particular, I had trouble finding out what the match_flags column in 
usb.usermap does, I eventually found the answer by looking through the code of 
usb.agent


cheers,

Daniel


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