[Bug 1413494] Re: Free partition space isn't correctly updated after erasing

[Yu Ning]

I checked the source code and found usb-creator can only calculate the
free space for a mounted partition, however the newly formated partition
isn't mounted.

So to fix the issue we could mount it automatically after the formating.
In the attached patch this job is done in the dbus method Format() in
usb-creator-helper. In my own test it works fine.

** Patch added: "auto-mount-after-format.patch"
   https://bugs.launchpad.net/ubuntu/+source/usb-creator/+bug/1413494/+attachment/4303499/+files/auto-mount-after-format.patch

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https://bugs.launchpad.net/bugs/1413494

Title:
  Free partition space isn't correctly updated after erasing

Status in usb-creator package in Ubuntu:
  New

Bug description:
  1) The release of Ubuntu you are using, via 'lsb_release -rd' or
  System -> About Ubuntu

  Ubuntu 14.04

  2) The version of the package you are using, via 'apt-cache policy
  pkgname' or by checking in Software Center

  usb-creator 0.2.56.3

  3) What you expected to happen

  First prepare an usbstick dd'ed with zero (dd if=/dev/zero of=/dev/SDB
  bs=1M count=1), then erase it with usb-creator-gtk.

  After the erasing it should display the free partition space
  correctly, which is usually the same value with the usbstick capacity.

  4) What happened instead

  After the erasing it just display the free space as an empty string
  "", and we can't burn them selected source ISO in such a case.

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