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Top Forums UNIX for Advanced & Expert Users Problems with udev & mounting fat32 usb storage Post 302511093 by jjinno on Tuesday 5th of April 2011 08:50:21 PM
Old 04-05-2011
MySQL

Believe it or not, you have helped me significantly.

I admit my udev rules relied heavily on a "USB-Storage" partition existing:
Code:
ACTION=="add", KERNEL=="sd*[0-9]", DRIVERS=="usb-storage",  SYMLINK="usb/%k"
ACTION=="add", KERNEL=="sd*[0-9]", DRIVERS=="usb-storage", RUN+="/bin/mkdir -p /media/usb/%k"
ACTION=="add", KERNEL=="sd*[0-9]", DRIVERS=="usb-storage", RUN+="/bin/mount /dev/%k /media/usb/%k -o sync", OPTIONS="last_rule"

However, if I tried to change them to use the base Kernel name, then all partitioned USB drives were failing... vice versa, when using the partition...

So what I did was push this identification into a script called "usbplug" which does the mkdir, tests if the mount succeeds, and does the rm on an empty dir if necessary after failed mount attempt. This way I can try to mount "/dev/sdc" for a partitioned drive, it will fail, and nobody really cares. But additionally, "/dev/sdb" (a FAT32 non-partitioned disk) will work, as will "/dev/sdc1" (a FAT16 partitioned disk).

Now my rules look like the following (and yes, I got a bit carried away and added an auto-run option):
Code:
# Auto-mount USB storage (on add):
ACTION=="add", KERNEL=="sd*", DRIVERS=="usb-storage", NAME="usb-%k", SYMLINK="usb/%k"
ACTION=="add", KERNEL=="sd*", DRIVERS=="usb-storage", RUN+="/etc/udev/scripts/usbplug --mount /dev/usb-%k /media/usb/%k"
ACTION=="add", KERNEL=="sd*", DRIVERS=="usb-storage", RUN+="/etc/udev/scripts/usbplug --autorun /dev/usb-%k", OPTIONS="last_rule"

You will also note that the rule now uses a "NAME" to insure that all USB mounts are grep-able simply with "mount | grep -i usb"... this helps the script avoid looking at my OS partitions (var, root, etc).

Fun stuff.

I wonder why they can get away without a partition table altogether... seems wrong.
 

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lsusb(8)							Linux USB Utilities							  lsusb(8)

NAME
lsusb - list all USB devices SYNOPSIS
lsusb [options] DESCRIPTION
lsusb is a utility for displaying information about all USB buses in the system and all devices connected to them. To make use of all the features of this program, you need to have Linux kernel 2.3.15 or newer which supports the /proc/bus/usb interface. OPTIONS
-v Tells lsusb to be verbose and display detailed information about all devices. -vv Tells lsusb to be very verbose and display even more information (actually everything the PCI device is able to tell). -s [[<bus>]:][<devnum>]] Show only devices in specified bus and devnum. -d [<vendor>]:[<product>] Show only devices with specified vendor and product ID. Both ID's are given in hexadecimal and may be omitted. -p <procpath> Use another path instead of /proc/bus/usb. -D <device> Do not scan the /proc/bus/usb directory, instead display only information if the device whose device file is given. -t Tells lsusb to dump the physical USB device hierarchy as a tree. FILES
/usr/share/hwdata/usb.ids A list of all known USB ID's (vendors, products, classes, subclasses and protocols). /proc/bus/usb An interface to USB devices provided by the post-2.3.15 Linux kernels. Contains per-bus subdirectories with per-device files and a devices file containing a list of all USB devices. SEE ALSO
lspci(8) AUTHOR
Thomas Sailer, <sailer@ife.ee.ethz.ch>. usbutils-0.2 14 September 1999 lsusb(8)
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