[Bug 1237360] Re: Can't pause the download

[Barry Warsaw]

PauseDownload is currently no-op'd, but it should be easy to plumb this
through to the download manager.  We also need to plumb the u-d-m's
paused signal through out through s-i's UpdatePaused signal.  (Ideally,
system-settings would talk directly to u-d-m, but IIRC didrocks wanted
to keep things simple there and only talk to one service).

There's one tricky bit.  Let's say the download is paused for longer
than 10 minutes.  If that happens, system-image-dbus will exit and lose
its state (retaining state after a re-invocation is part of another bug,
but we'll see if that gets fixed before saucy, since it's complicated).

We could suspend exiting the main loop when there's a download paused,
but then we run the risk of keeping s-i-dbus alive effectively forever,
since there's no other event that would cause it to exit.  If we do
that, I think we have to cancel any existing paused downloads.

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https://bugs.launchpad.net/bugs/1237360

Title:
  Can't pause the download

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

Bug description:
  Using the image "86":

  - go to system-settings
  - open the upgrade panel
  - start downloading the current image
  - click on the pause button

  nothing happens, the download is not pause

  The UI works fine with the mock.

  Trying to pause with a command line call doesn't work either
  "gdbus call --system -d com.canonical.SystemImage -o /Service -m com.canonical.SystemImage.PauseDownload"

  that seems to indicator the issue is with the service

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