[Bug 1991022] Re: [FFe] Socket activation

[Nathan Teodosio]

** Description changed:

  [Description]
  
  Systemd socket activation for Speech Dispatcher.
  
    - Creates the speech-dispatcher.socket;
    - Modifies the server so that it can detect it was automatically launched by that socket activation; and
    - Modifies the Autotools files accordingly.
  
  [Rationale]
  
  It's relevance is described in [1], of which I quote the essential parts
  [my notes in brackets]:
  
  > Sandboxed applications [snaps] that use Speech Dispatcher currently bundle it inside of the sandbox, so that each application has its own "private" instance of Speech Dispatcher running. This works more or less, but it has the downside that speech dispatcher cannot coordinate simultaneous messages from multiple apps. When multiple sandboxed apps use Speech Dispatcher at the same time, the text reading overlaps.
  >
  > In order to solve this issue, I would really like to give sandboxed apps access to the Speech Dispatcher instance of the host.
  
  And then,
  
  > The only issue I see is having it auto launch. I think it would
  probably be a good step forward for speech-dispatcher to be auto
  launched by a systemd socket like other daemons already do on demand.
  That way the host speech-dispatcher with it's configuration would be
  used by all snaps,
  
  [Additional information]
  
  The changes are already merged upstream[2], but still not released.
  
- I have built and installed the package in Kinetic and verified that spd-
- say still causes the dispatcher spawn and emits sound. Upstream test can
- also confirm this.
+ I have built and installed the package in Mantic and verified that
+ running spd-say from inside a snap causes the host's dispatcher to spawn
+ and emit sound — see 'Reproduction case' for more details.
  
- [1]: https://github.com/brailcom/speechd/issues/335
- [2]: https://github.com/brailcom/speechd/pull/763
+ The installed socket needs to be started manually to function correctly,
+ or else the system needs to be rebooted.
+ 
+ [Reproduction case]
+ 
+ Install the proposed speech-dispatcher from the PPA[3] and the snap[4]
+ with spd-say. Then,
+ 
+   systemctl start --user speech-dispatcher.socket
+   snap run --shell geheim
+   $ XDG_RUNTIME_DIR=/run/user/1000 spd-say hi
+ 
+ [1] https://github.com/brailcom/speechd/issues/335
+ [2] https://github.com/brailcom/speechd/pull/763
+ [3] https://launchpad.net/~nteodosio/+archive/ubuntu/rebuilds/+build/26035882
+ [4] https://launchpad.net/~nteodosio/+snap/test-speechd/+build/2103550

** Changed in: speech-dispatcher (Ubuntu)
       Status: Fix Released => In Progress

** Summary changed:

- [FFe] Socket activation
+ Service activation via Systemd socket

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https://bugs.launchpad.net/bugs/1991022

Title:
  Service activation via Systemd socket

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