[Bug 1284217] Re: [updates] Displays a spinner indefinitely when an update download was started externally

[Barry Warsaw]

On Feb 25, 2014, at 03:59 PM, Manuel de la Peña wrote:

>> I did it this way because I still observed download failures when the
>> checking lock was released during an automatic download.  Now, it's
>> possible that the other fixes I and Manuel implemented would make those
>> download failures go away (i.e. because of fixes to u-d-m, or
>> workarounds in s-i), but we'd have to be very careful to test that
>> vigorously before I'd be confident in releasing the check lock earlier.
>>
>Would be interesting to see what happens if you do not do that and if the
>downloads occur they step on the present file... of course that means
>reverting changes for testing, but if it fixes the issue...

I'd have to think very carefully about the concurrency issues involved, which
is why I'm taking the conservative approach of disallowing multiple CFU while
auto-download is in progress.  You're right that I'm most worried about
clobbering existing files, since some of the downloads occur to generic local
file names (e.g. keyrings.tar.xz before it's moved and unpacked).

>Could an other solution tell the ui to connect to udm and check if there is
>a download in process for the updates??? that way, before performing any
>checkForUpdate we can ensure that the download is not being done. Am I just
>saying something stupid?

Not stupid at all!  I was going to suggest something like that before I had my
previous revelation. :)  That would however entail an API change, but it could
probably be done in a backward compatible way.  Since we're past feature
freeze though, I didn't want to have to force both s-i and s-s to make that
change.

Let's see if the current patch will do the trick.

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https://bugs.launchpad.net/bugs/1284217

Title:
  [updates] Displays a spinner indefinitely when an update download was
  started externally

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

Bug description:
  These packages are currently in the CI train PPA
  <https://launchpad.net/~ci-train-ppa-service/+archive/landing-010/>.
  Upgrade to these first.

  1. Make sure you're on auto download of updates (wi-fi) and that there's a system image update available to you
  2. Open system-settings
  3. Wait for "Updates available" to show, and click it
  4. "Checking for updates" and an activity indicator appear
  5. Wait. Don't let the screen blank (bug #1259326 - not sure this is actually still a problem but better safe than sorry). The update is downloading in the background at this point.
  6.  When the update has finished downloading, you'll see the standard popover inviting you to install or cancel.

  What should have happened is: instead of or shortly after step 4, we
  should have seen the status of the in-progress download, just as if
  we'd started it from the update panel.

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