objective: automount a thumbdrive when it is inserted, autodetect

objective: automount a thumbdrive when it is inserted, autodetect

[Brian T. Brunner]

I run shrike (RH9, linux kernel 2.4.20-8).

I insert a thumb drive (Kanguru Microdrive 128MB) 
that lsusb says is 0d7d/0120 Apacer.

Currently I poll for the device being physically present using 
system("grep -q usb-storage /proc/bus/usb/devices)".  
This seems to be a reliable indicator of whether the device is inserted.

When this returns success, then mount("/dev/sda1","/mnt/thumbdrive") and 
system("cat bigfile | bzip2 > /mnt/thumbdrive/smallfile") to compress 
bigfile onto the thumbdrive. There may be several bigfiles.

Then I umount("/mnt/thumbdrive") and wait for the periodic grep
of usb-storage in /proc/bus/usb/devices to indicate that the thumbdrive 
went away, and then got plugged in again.

This all works fine the first time, sometimes the second. 

By time the 5th attempt is made, /var/log/messages begins to get 
"kernel: usb_control/bulk_msg: timeout"
messages, and "time lsusb" takes 15 seconds to run.

The file copy take proportionately longer, but completes.

devlabel is not employed (I tried it, it created a symlink and 
did nothing else; no automount ever occurred).

I'll happily RTFM, which part? Or is there a clue about
the cause of the timeout?


Brian Brunner
brian.t.brunner@gai-tronics.com
(610)796-5838



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