[Bug 1250181] Re: download update from 16 to 20 failed on mako

[Barry Warsaw]

IRC discussion:

It's definitely unexpected that you'd see duplicate data files in a
delta upgrade path.  This is an error condition on the server.  Thus the
client has three options:

1) fail, probably by raising a DuplicateDataFile error and providing
some reasonable error string in the D-Bus error signal.

2) Ignore duplicates and carry on as if nothing's wrong.

3) Throw away the delta upgrade path and re-calculate as if
--filter=full

#2 is problematic because duplicate data files *could* lead to
unbootable devices.  It's an unexpected condition with unknown effects
on the upgrade results.

#3 is just masking over the problem.

So we'll do #1.  It means that if this problem reoccurs (stgraber is
fixing the server side) the user will be stuck because upgrades via the
u/i will be impossible until the server is fixed.  It should still be
possible to perform an upgrade via cli with either --filter=full or -b
0.  Still, this gives us the best opportunity to notice the problem and
fix the server.

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https://bugs.launchpad.net/bugs/1250181

Title:
  download update from 16 to 20 failed on mako

Status in Ubuntu Download Manager:
  Confirmed
Status in Ubuntu system image (server/client/updater):
  Confirmed
Status in “system-image” package in Ubuntu:
  Confirmed

Bug description:
  Trying to OTA update from 16 to 20 on mako. See screenshot.

  root at ubuntu-phablet:/var/log/system-image# system-image-cli -i
  current build number: 16
  device name: mako
  channel: trusty-proposed
  last update: 2013-11-09 13:52:54
  version version: 16
  version ubuntu: 20131109
  version device: 20131109

  From /var/log/system-image/client.log

  [systemimage] Nov 11 18:24:00 2013 (8816) Running group download reactor
  [systemimage] Nov 11 18:25:20 2013 (8816) Group download reactor done
  [systemimage] Nov 11 18:25:23 2013 (8816) uncaught exception in state machine
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/systemimage/state.py", line 138, in run_until
      step()
    File "/usr/lib/python3/dist-packages/systemimage/state.py", line 453, in _download_files
      raise SignatureError(dst)
  systemimage.gpg.SignatureError: /android/cache/recovery/device-bc45abbc8b271608f690cc12f7e3dd6e3b6527fdd818a22ea1d2d204350dc56e.delta-device-f67595b49ad4c8233c0ad4645695dd2154242dc3e29b4a60a3afc39058b126a6.tar.xz

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