[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[Sebastian Heinlein]

Good idea to use a timeout. Could be implemented on the
aptdaemon/gtk3widgets level.

Sometimes a background task could block your transaction (e.g. fetching
the latest updates) - those background tasks use an apt-get based cron
job. We could detect if it is part of the cron job or if the apt-get
command runs in a terminal.

Furthermore we could hardcode nice names for apt-get, aptitude and dpkg.

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Title:
  No obvious error when Software Centre can't install due to Synaptic
  being open

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[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[Matthew Paul Thomas]

Sebastian, I'm reopening this for aptdaemon because I think it should be
handled in one place, rather than USC, the Dash, Software Updater, and
Software Sources all having to implement it individually.

So, I've designed an alert that should appear to let you know what's
going on, with a choice to keep waiting or to cancel the operation.

Does that all look practical to you?

** Changed in: aptdaemon (Ubuntu)
   Status: Opinion => Triaged

** Description changed:

- Binary package hint: software-center
+ Ubuntu Software Center 3.0.5, Ubuntu 10.10
  
  If Synaptic is running and you attempt to install software from the
  Software Centre, it just sits there with the in progress icon turning
  (see attached image). It is only when you click on the icon that it
  says: 'Waiting for synaptic to exit'. A notification would make this
  more obvious for the user.
  
- ProblemType: Bug
- DistroRelease: Ubuntu 10.10
- Package: software-center 3.0.5
- ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
- Uname: Linux 2.6.35-22-generic i686
- NonfreeKernelModules: nvidia
- Architecture: i386
- Date: Sat Oct 30 19:40:13 2010
- InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
- PackageArchitecture: all
- ProcEnviron:
-  LANG=en_GB.UTF-8
-  SHELL=/bin/bash
- SourcePackage: software-center
+ : "If apt
+ (/var/lib/apt/lists/lock) or dpkg (/var/lib/dpkg/lock) is locked by
+ something other than aptdaemon (STATUS_WAITING_LOCK) for more than 30
+ seconds, an alert should appear once, '{calling application} can’t
+ install or remove software until {locking program} exits.', with
+ 'Cancel' and 'Keep Waiting' buttons..."

** Changed in: software-center (Ubuntu)
 Assignee: Matthew Paul Thomas (mpt) => (unassigned)

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Title:
  No obvious error when Software Centre can't install due to Synaptic
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[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[Sebastian Heinlein]

I close bug for aptdaemon since I don't see how we could improve the
situation from the daemon side.

The transaction is in the STATUS_WAITING_LOCK state. INMHO software-
center should raise the visibility of this state e.g. by showing a
persistent in-window notification if the transaction is in this state
for a longer time.

If you need any code from the aptdaemon side please feel free to reopen
it again.

** Changed in: aptdaemon (Ubuntu)
   Status: Confirmed => Opinion

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Title:
  No obvious error when Software Centre can't install due to Synaptic
  being open

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[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[Sebastian Heinlein]

The "cleanest"  solution would be to use aptdaemon for the daily updates
and in synaptic. But especially the later one would require a little bit
of work.

Since synaptic runs in the user session and aptdaemon doesn't it isn't
the job of aptdameon to notify the user. Sending Synaptic to the front
doesn't give the user any clue that he has to close it. Furthermore it
is a bad idea to close an application without the confirmation of the
user. You never know what kind of unapplied changes there are.

** Also affects: aptdaemon (Ubuntu)
   Importance: Undecided
   Status: New

** Changed in: aptdaemon (Ubuntu)
   Importance: Undecided => Low

** Changed in: aptdaemon (Ubuntu)
   Status: New => Confirmed

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Title:
  No obvious error when Software Centre can't install due to Synaptic
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[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[Sebastian Heinlein]

Aptdaemon already shows the name of the binary/application which holds
the lock in the status message: "Waiting for XXX to exit...". Possible
values in real life are aptitude, apt-get, dpkg and synaptic.

The status of the transaction is set to PK_STATUS_ENUM_WAITING_FOR_LOCK
on the PackageKit interface and to
aptdaemon.enums.STATUS_WATING_FOR_LOCK on the aptdaemon interface which
is used by s-c.

So basically all technical requirements are there.

An important use case is the daily update of the cache to check for
upgrades. It "currently" doesn't use aptdaemon but calls apt-get update.
So you can get random cache locks.

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Title:
  No obvious error when Software Centre can't install due to Synaptic
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[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[Matthew Paul Thomas]

** Changed in: software-center (Ubuntu)
 Assignee: Sebastian Heinlein (glatzor) => Matthew Paul Thomas (mpt)

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[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[Michael Vogt]

Hello Matthew,

sorry for the slow reply. It is possible in aptdaemon to figure out the name of 
the application that holds the lock.
I am not sure if there is a generic way of offering to close the application as 
it would have to be voluntarily and 
I don't think there is a generic way for this. For synaptic aptdaemon could 
send "SIGUSR1" to bring synaptic to
the foreground (it will call gtk_window_present()). Just sending a SIGINT or 
SIGKILL is probably too dangerous as
a dpkg operation might be in progress.

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  No obvious error when Software Centre can't install due to Synaptic
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[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[Matthew Paul Thomas]

** Changed in: software-center (Ubuntu)
 Assignee: Matthew Paul Thomas (mpt) => Sebastian Heinlein (glatzor)

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  No obvious error when Software Centre can't install due to Synaptic
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[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[Matthew Paul Thomas]

Ryan, showing a notification bubble might be frustrating if there's a
way that the computer can help you solve the problem. It might also be
frustrating if there's nothing you can do about the problem. I think we
should instead be more interactive, offering to close Synaptic for you
to unblock. And it should be Aptdaemon that does this, so that Software
Updater and the Dash also benefit.

Sebastian, Is there a way to tell whether it is Synaptic, or another
program (such as apt-get), that has the dpkg lock?

If so, would it make sense for aptdaemon to detect whether it is an
application with a .desktop file that has the lock, and offer to close
it if it is?

And if not, would it make sense to special-case Synaptic, detecting
whether it is open and offering to close it?

(Please assign back to me when these questions are answered. Thanks!)

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  No obvious error when Software Centre can't install due to Synaptic
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[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[Paddy Landau]

Agreed with Ryan. A notification is important. Merely adding an icon to
the row is insufficient, especially if you leave the Ubuntu Software
Centre running in the background while you continue work on something
else.

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  No obvious error when Software Centre can't install due to Synaptic
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[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[Matthew Paul Thomas]

** Changed in: software-center (Ubuntu)
   Status: Triaged => Confirmed

** Changed in: software-center (Ubuntu)
 Assignee: (unassigned) => Matthew Paul Thomas (mpt)

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  No obvious error when Software Centre can't install due to Synaptic
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[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[Ryan Schwenker]

I actually think that a notification would be nice, if it used Ubuntu's
default desktop notification system (NotifyOSD I think). I agree that no
notification about this should have to appear in the Software Center,
but perhaps something from NotifyOSD like "Please exit Synaptic to
continue installing ".

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[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[Kiwinote]

Hi David! Thanks for your bug report. We probably don't want to display
a notification here, but it indeed doesn't make much sense to display a
spinning icon with the label 'in progress' when there isn't any
progress. We could do something along the lines of either not spinning
the icon, or using a different icon, or appending an alert icon to the
end of the row.

** Changed in: software-center (Ubuntu)
   Importance: Undecided => Low

** Changed in: software-center (Ubuntu)
   Status: New => Triaged

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[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[David Green]

** Attachment added: "Selection_010.png"
   
https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/668846/+attachment/1717340/+files/Selection_010.png

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[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[David Green]

** Attachment added: "Selection_008.png"
   
https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/668846/+attachment/1717332/+files/Selection_008.png

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[Bug 668846] Re: No obvious error when Software Centre can't install due to Synaptic being open

[David Green]

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