[Merge] lp:~jamesodhunt/ubuntu/vivid/ubuntu-core-upgrader/bug-1444500 into lp:ubuntu/ubuntu-core-upgrader

[James Hunt]

James Hunt has proposed merging lp:~jamesodhunt/ubuntu/vivid/ubuntu-core-upgrader/bug-1444500 into lp:ubuntu/ubuntu-core-upgrader.

Requested reviews:
  Ubuntu branches (ubuntu-branches)
Related bugs:
  Bug #1444500 in snappy-ubuntu: "Update doesn't work when upgrading from devel r145 to r383 devel-proposed"
  https://bugs.launchpad.net/snappy-ubuntu/+bug/1444500

For more details, see:
https://code.launchpad.net/~jamesodhunt/ubuntu/vivid/ubuntu-core-upgrader/bug-1444500/+merge/256386

* ubuntucoreupgrader/upgrader.py: _cmd_mount(): Don't sync partitions
  for a full (non-delta) update (LP: #1444500).
* ubuntucoreupgrader/tests/test_upgrader.py: Added test to ensure
  sync_partitions() is called when expected.
* ubuntucoreupgrader/upgrader.py: remount_rootfs(): Call
  get_mount_details() rather than calling findmnt(8) directly
  (simplifies code and make testing easier).

-- 
Your team Ubuntu branches is requested to review the proposed merge of lp:~jamesodhunt/ubuntu/vivid/ubuntu-core-upgrader/bug-1444500 into lp:ubuntu/ubuntu-core-upgrader.
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