touch-packages team mailing list archive

[Barry Warsaw <1371703@xxxxxxxxxxxxxxxxxx>]

I agree it's critical to think about.  At the lowest level of the above
stack, a shell + system-image-cli + networking should be able to update
the device, but it's probably not super easy for the average user.  I
can imagine a small script that would use adb to shell in and run the
update.

If the device's network is down, then I can also imagine that script
could optionally push all the data and keyring files obtained in some
other way (e.g. via a web site visited on the host). Once the device is
attached to USB, this script would push the files into the right place
and invoke s-i-cli over adb.


** Also affects: ubuntu-system-image
   Importance: Undecided
       Status: New

** Tags added: client

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Touch seeded packages, which is subscribed to system-image in Ubuntu.
https://bugs.launchpad.net/bugs/1371703

Title:
  No fallback if the system update process fails at any point

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

Bug description:
  For someone to install a system update, all of the following need to be true:
  (A) The phone needs to start up completely.
  (B) Unity needs to not crash.
  (C) The networking stack needs to let Ubuntu check for updates.
  (D) If System Settings is not in the Launcher, the Apps scope needs to not crash.
  (E) System Settings needs to launch without crashing.
  (F) The System Settings "Updates" screen needs to open without crashing.
  (G) The system-image update system itself needs to work properly.

  This is a long and brittle chain. If *any one* of these steps breaks,
  the phone is no longer updateable. And at worst -- if A, B, or C fails
  -- the phone is effectively bricked.

  This is not a theoretical problem. On Ubuntu for PC, crasher bugs in
  update-manager often persist for a long time in the list of most
  common errors, because the updates that fix them can't themselves be
  installed until a nearby geek cracks out a terminal to use apt-get.
  That's not so practical on a phone.

  Therefore, there should be a fallback path for installing system image
  updates in emergency situations. This path may not avoid all of the
  requirements listed above, but it should avoid as many as practical.

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