[Merge] lp:~jamesodhunt/ubuntu/vivid/ubuntu-core-upgrader/add-sync-calls into lp:ubuntu/ubuntu-core-upgrader

[James Hunt]

James Hunt has proposed merging lp:~jamesodhunt/ubuntu/vivid/ubuntu-core-upgrader/add-sync-calls into lp:ubuntu/ubuntu-core-upgrader.

Requested reviews:
  Ubuntu branches (ubuntu-branches)

For more details, see:
https://code.launchpad.net/~jamesodhunt/ubuntu/vivid/ubuntu-core-upgrader/add-sync-calls/+merge/254941

* ubuntucoreupgrader/upgrader.py: Call sync at end of sync_partitions() and
  after each unpack to minimise unflushed data and thus minimise the risk of
  corruption issues (such as LP:1435774).
-- 
Your team Ubuntu branches is requested to review the proposed merge of lp:~jamesodhunt/ubuntu/vivid/ubuntu-core-upgrader/add-sync-calls into lp:ubuntu/ubuntu-core-upgrader.
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