[Bug 1568889] Re: OTA and u-d-f fail if image is too big for the system partition

[Jean-Baptiste Lallement]

@Barry and Pat, as I understand the delta update process, it starts by removing files listed in the "remove" list then unpack everything on top of the system partition. This way to proceed has 2 consequences:
1. It can break at any point once there is no space left. So parsing the log afterwards to report that update failed won't help because depending on when tar failed and which files have been updated, the result is undetermined and there is no guarantee that the system will even boot.
2. Calculating the size of the update on the client side will be extremely expensive. For each file in the tarball, the upgrader would have to calculate the size difference between this file and the same file on the filesystem, sum it and compare to the free space in the system partition.

A possibility would be to calculate the size difference server side,
during the calculation of the delta, and store this information in the
json index for delta type updates. Then system-image can use this
information to decide whether or not an upgrade is possible.

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Title:
  OTA and u-d-f fail if image is too big for the system partition

Status in Canonical System Image:
  Confirmed
Status in android package in Ubuntu:
  New
Status in system-image package in Ubuntu:
  Confirmed
Status in ubuntu-download-manager package in Ubuntu:
  Invalid
Status in ubuntu-system-settings package in Ubuntu:
  New

Bug description:
  On Meizu MX4 upgrade from OTA-9.1 to OTA-10 fails.
  Upgrade downloads normally, phone restarts and starts system upgrade and after a while it freezes with strange icon (small microchip with red sign on it)

  When you turn off the phone and start it again it still presents itself as OTA-9.1 and again it founds and offer upgrade.
  Anyway some changes from OTA-10 seems to be applied, because I can see design changes, copy function in web browser etc.

  It's reproducible on my phone any time I try to upgrade. If I can help
  with output of some log, or anything else, please let me know.

  Well described here by Lars Kristian Wichmann Hansen:
  http://askubuntu.com/questions/754963/upgrade-meizu-mx4-ubuntu-edition-to-ota-10-fails

  * u-d-f case described in bug 1582325

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