[Bug 873974] Re: do-release-upgrade fails from 11.04 to 11.10 due to missing btrfs-tools package

[Jean-Baptiste Lallement]

** Changed in: update-manager (Ubuntu)
       Status: Incomplete => Fix Released

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https://bugs.launchpad.net/bugs/873974

Title:
  do-release-upgrade fails from 11.04 to 11.10 due to missing btrfs-
  tools package

Status in “update-manager” package in Ubuntu:
  Fix Released

Bug description:
  Release upgrade doesn't check whether btrfs-tools package is installed
  before attempting to use the commands within the package.

  I have an 11.04 installation (that was done with the installer,
  possibly one of the betas) that uses btrfs root, but doesn't have
  btrfs-tools installed. The attached trace is displayed, but doesn't
  really offer any useful help on what went wrong. The easiest way to
  fix this would be to check whether the btrfs-tools package is
  installed and install it if not, assuming that the user is using
  btrfs.

  --------8<--------
  Traceback (most recent call last): 

  File "/tmp/update-manager-VGGglZ/oneiric", line 7, in <module> 
  sys.exit(main()) 

  File "/tmp/update-manager-VGGglZ/DistUpgradeMain.py", line 199, in 
  main 
  if app.run(): 

  File "/tmp/update-manager-VGGglZ/DistUpgradeController.py", line 
  1670, in run 
  return self.fullUpgrade() 

  File "/tmp/update-manager-VGGglZ/DistUpgradeController.py", line 
  1639, in fullUpgrade 
  if not self.doDistUpgrade(): 

  File "/tmp/update-manager-VGGglZ/DistUpgradeController.py", line 
  1033, in doDistUpgrade 
  self._maybe_create_apt_btrfs_snapshot() 

  File "/tmp/update-manager-VGGglZ/DistUpgradeController.py", line 
  1017, in _maybe_create_apt_btrfs_snapshot 
  res = apt_btrfs.create_btrfs_root_snapshot(prefix) 

  File "/tmp/update-manager-VGGglZ/apt_btrfs_snapshot.py", line 123, in 
  create_btrfs_root_snapshot 
  os.path.join(mp, self.SNAP_PREFIX+additional_prefix+snap_id)) 

  File "/tmp/update-manager-VGGglZ/apt_btrfs_snapshot.py", line 70, in 
  btrfs_subvolume_snapshot 
  source, dest]) 

  File "/usr/lib/python2.7/subprocess.py", line 486, in call 
  return Popen(*popenargs, **kwargs).wait() 

  File "/usr/lib/python2.7/subprocess.py", line 672, in __init__ 
  errread, errwrite) 

  File "/usr/lib/python2.7/subprocess.py", line 1213, in _execute_child 
  raise child_exception 

  OSError: [Errno 2] No such file or directory

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