[Bug 1820090] Re: SRU: fix FAT recognition after resizing

[Thomas Ward]

Hello.

Attached is a debdiff containing a patch with the specified upstream
commit included, for Bionic.


** Patch added: "lp1820090.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/parted/+bug/1820090/+attachment/5246581/+files/lp1820090.debdiff

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Title:
  SRU: fix FAT recognition after resizing

Status in parted package in Ubuntu:
  Confirmed

Bug description:
  After resizing a FAT partition with any tool that uses libparted
  (parted, gparted) in Bionic, the file system is no longer recognizable
  by Microsoft Windows.

  This fix has been applied in Cosmic+.
  The Debian bug report is:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=840710
  The patch applied upstream is:
  http://git.savannah.gnu.org/cgit/parted.git/commit/?id=c0d394abac4d6d2ce35c98585b6ecb33aea48583

  [Test case]
   * Use e.g. gparted to format a USB stick with MBR and a fat32 partition.
   * Verify that it's readable by Windows.
   * Check for correct output similar to this:
  # file -s /dev/sdf1
  /dev/sdf1: DOS/MBR boot sector, code offset 0x58+2, OEM-ID "mkfs.fat", sectors/cluster 16,
  Media descriptor 0xf8, sectors/track 32, heads 64, hidden sectors 2048, sectors 30447616
  (volumes > 32 MB), FAT (32 bit), sectors/FAT 14864, serial number 0x7a03dea6, label: "ASDF       "
   * Resize it to e.g. 1 MB less.
   * Verify that it's no longer readable by Windows.
   * Check for wrong output similar to this:
  # file -s /dev/sdf1
  /dev/sdf1: DOS/MBR boot sector

  [Regression Potential]
  Minimal, the patch is an upstream one and already tested in Debian, in the Gparted live CD, and in newer Ubuntu releases.

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