logind: make sure to terminate systemd user on logouts

Currently if the user logs out, the GC may never call user_stop(),
this will not terminate the systemd user and (sd-pam) of that user.

To fix this, remove the USER_CLOSING state check that is blocking the
GC from calling user_stop(). Since if user_check_gc() returns false
this means that all the sessions of the user were removed which will
make user_get_state() return USER_CLOSING.

Conclusion: that test will never be statisfied.

So we remove the USER_CLOSING check and replace it with a check inside
user_stop() this way we know that user_stop() has already queued stop
jobs, no need to redo.

This ensures that the GC will get its two steps correctly as pointed out
by Lennart:
http://lists.freedesktop.org/archives/systemd-devel/2014-February/016825.html

Note: this also fixes another bug that prevents creating the user
private dbus socket which will break communications with the user
manager.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/login/logind-user.c b/src/login/logind-user.c
index ac4a651f3..4af0e90c2 100644
--- a/src/login/logind-user.c
+++ b/src/login/logind-user.c
@@ -499,6 +499,12 @@ int user_stop(User *u, bool force) {
         int r = 0, k;
         assert(u);
 
+        /* Stop jobs have already been queued */
+        if (u->stopping) {
+                user_save(u);
+                return r;
+        }
+
         LIST_FOREACH(sessions_by_user, s, u->sessions) {
                 k = session_stop(s, force);
                 if (k < 0)