Better way to script USB device mount in Linux

Question

I\'m writing a python module for a device that interacts with a user supplied USB memory stick. The user can insert a USB memory stick in the device USB slot, and the device

Answer 1

This seems to work combining /proc/partitions and the /sys/class/block approach ephimient took.

#!/usr/bin/python
import os
partitionsFile = open("/proc/partitions")
lines = partitionsFile.readlines()[2:]#Skips the header lines
for line in lines:
    words = [x.strip() for x in line.split()]
    minorNumber = int(words[1])
    deviceName = words[3]
    if minorNumber % 16 == 0:
        path = "/sys/class/block/" + deviceName
        if os.path.islink(path):
            if os.path.realpath(path).find("/usb") > 0:
                print "/dev/%s" % deviceName

I'm not sure how portable or reliable this is, but it works for my USB stick. Of course find("/usb") could be made into a more rigorous regular expression. Doing mod 16 may also not be the best approach to find the disk itself and filter out the partitions, but it works for me so far.