[Bug 1581351] [NEW] Improve deltas for click packages (puritine)

[Jean-Baptiste Lallement]

Public bug reported:

Currently if the version of a click package changes, the full click package is included in the delta, which may result in huge delta updates.
It's minor for most of the click packages. But in the case of ubuntu-pd and the puritine click it means we are delivering all of puritine and the apps in the libertine container even for a single file change in the click package. It's an OTA of 350MB and 1.5GB to uncompress on disk on the tablet.

** Affects: canonical-devices-system-image
     Importance: Undecided
         Status: New

** Affects: puritine
     Importance: Undecided
         Status: New

** Affects: system-image (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: system-image (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: puritine
   Importance: Undecided
       Status: New

** Summary changed:

- Improve deltas for click packages
+ Improve deltas for click packages (puritine)

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https://bugs.launchpad.net/bugs/1581351

Title:
  Improve deltas for click packages (puritine)

Status in Canonical System Image:
  New
Status in Puritine:
  New
Status in system-image package in Ubuntu:
  New

Bug description:
  Currently if the version of a click package changes, the full click package is included in the delta, which may result in huge delta updates.
  It's minor for most of the click packages. But in the case of ubuntu-pd and the puritine click it means we are delivering all of puritine and the apps in the libertine container even for a single file change in the click package. It's an OTA of 350MB and 1.5GB to uncompress on disk on the tablet.

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