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[Loïc Minier <lool@xxxxxxxx>]

Changing /usr/share/upstart/sessions/application-legacy.override to run things within sh -c fixes it:
script
        if [ -z $APP_EXEC_POLICY ]; then
                exec sh -c "$APP_EXEC --desktop_file_hint=/usr/share/application
s/$APP_ID.desktop"
        else
                exec sh -c "aa-exec -p '$APP_EXEC_POLICY' -- $APP_EXEC"
        fi
end script

And I can launch music-app and it plays files again, and I also tried with a file with spaces and single quotes:
phablet   4795  3.7  3.6 348472 70508 ?        Tl   21:13   0:05                  \_ /usr/lib/arm-linux-gnueabihf/qt5/bin/qmlscene /usr/share/music-app/music-app.qml --file=/home/phablet/Music/29.07.2013 - 19:00 - L'Esprit de Mai.mp3 --desktop_file_hint=/usr/share/applications/music-app.desktop
and it worked fine.

Or more abruptly with eval:
script
        if [ -z $APP_EXEC_POLICY ]; then
                eval exec $APP_EXEC --desktop_file_hint=/usr/share/applications/
$APP_ID.desktop
        else
                eval exec aa-exec -p '$APP_EXEC_POLICY' -- $APP_EXEC
        fi
end script

but I'm not happy with either of these as e.g. APP_EXEC_POLICY would
require quoting before it gets unquoted by eval or sh -c...

-- 
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bugs, which is subscribed to Upstart Application Launcher.
https://bugs.launchpad.net/bugs/1228387

Title:
  Doesn't unquote double-quotes from desktop files

Status in Upstart Application Launcher:
  New
Status in “upstart-app-launch” package in Ubuntu:
  New

Bug description:
  Hi,

  Testing the fix for bug #1228125, I can confirm that trying to play "a b/c d.mp3" a single argument now gets passed to qmlscene instead of multiple ones, but it's still double-quoted:
  /usr/lib/arm-linux-gnueabihf/qt5/bin/qmlscene^@/usr/share/music-app/music-app.qml^@--file="/home/phablet/Music/01-guillemin_napoleon2-500k.mp3"^@--desktop_file_hint=/usr/share/applications/music-app.desktop^@

  so music-app tries to open a file starting and ending with double-
  quotes...

  Cheers,

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