[1.11] mate-session-save tool doesn't work right after upgrade from 1.10

[monsta]

Steps to reproduce:

1. Have MATE 1.10 installed.
2. Upgrade mate-desktop to 1.11 (see https://github.com/mate-desktop/debian-packages/commit/aca038f1235bb2d5801ee56bd69fb277cca0d376).
3. Upgrade mate-session-manager to 1.11 (also it's better to upgrade mate-settings-daemon to 1.11 at the same time, see https://github.com/mate-desktop/debian-packages/commit/f106be84565b5baae5d4e21c7a0dc9754574b9ea).
4. Try running mate-session-save with --logout-dialog or --shutdown-dialog or other arguments.
   It will fail with an error message like this:

** (mate-session-save:2951): WARNING **: Failed to call logout: The name org.gnome.SessionManager was not provided by any .service files

It doesn't work as it's 1.11 version of the tool, so it tries to use org.gnome.SessionManager (after b01c417) - but the currently running session still uses org.mate.SessionManager.

This affects the apps or applets that rely on mate-session-save to provide logout/shutdown ability (e.g. mintMenu): you can't log out or shut down the system. Of course the issue will be gone on the next session run, but... 😄

This doesn't affect the built-in menu and menu-bar applets. They use panel's own code which still uses org.mate.SessionManager at the time. (Well, if you upgrade the panel to 1.11 as well, then restart it via killall mate-panel, then it will cease to work; but would you do that? 😄)

[raveit65]

But a session restart after update of all affected packages should help?

[monsta]

Yes, or some other solution.

@clefebvre @flexiondotorg @willysr @posophe @obache
So, we really need to solve this before 1.12 release - either upstream or in all distros...
Thoughts guys?

[willysr]

upstream is preferred

[monsta]

I was actually wondering how we'd solve it 😄

[raveit65]

dowstream maintainers need to do the update in one rush and marked it as 'restart is needed', if they are brave enough to update in a running release cycle ;)

[monsta]

The problem is the failure of the usual tools for restarting (until the next session run)... if you use mintMenu, for example.

[monsta]

Ok guys, here's one possible solution in #104, please test if you can 😄