usb_test crashed with IOError in MD5HashFile(): [Errno 2] No such file or directory: '/media/0752d43e-50a5-404a-8f80-8590d7afeb6a/tmpir4Tft'

[Matt Fischer]

OS: Ubuntu 11.10
checkbox-gtk:
  Installed: 0.12.8

Actual Results:
The USB/storage-transfer test crashed.

I have a USB HDD that was owned by root and I cannot write to it (I didn't know this at the time) and the result is this crash. The test probably should gracefully handle this failure to write to a device.

Expected Results:
That the test doesn't crash.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: checkbox 0.12.8
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
CheckboxSubmission: 50e2022c70b67da9a656b835f810a8a3
CheckboxSystem: b845c366ea09c60efa3a45c1b5b21525
Date: Tue Nov 8 13:34:08 2011
ExecutablePath: /usr/share/checkbox/scripts/usb_test
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
InterpreterPath: /usr/bin/python2.7
ProcCmdline: /usr/bin/python /usr/share/checkbox/scripts/usb_test -t
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/share/checkbox/scripts/usb_test', '-t']
SourcePackage: checkbox
Title: usb_test crashed with IOError in MD5HashFile(): [Errno 2] No such file or directory: '/media/0752d43e-50a5-404a-8f80-8590d7afeb6a/tmpir4Tft'
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Matt Fischer (mfisch)]

The file "checkbox logfile" was done on a second run in order to capture the logs per the bug filing directions.

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #877581, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.

[Daniel Manrique (roadmr)]

The usb_test will try to write and read a file in *all* present USB devices. We assume a bunch of things in the code, mainly that the USB drives will be writable by the current user, which is true for standard-issue VFAT USB sticks, but will probably fail on an ext3/4 drive unless permissions are handled carefully. If things fail, the script will unceremoniously crash as seen in this report. So:

- The script needs to gracefully handle the case where a device is unwritable. Simplistically we could run the test as root, but I'd rather not :)
- The script needs to handle multiple USB devices in a sane maner, or at least warn the user that it's about to write files on all connected devices (the current description is less than clear about this).