[systemd-bugs] [Bug 90818] New: logind: Save the user’s state when a session enters SESSION_ACTIVE

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90818

            Bug ID: 90818
           Summary: logind: Save the user’s state when a session enters
                    SESSION_ACTIVE
           Product: systemd
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: systemd-bugs at lists.freedesktop.org
          Reporter: bugzilla at tecnocode.co.uk
        QA Contact: systemd-bugs at lists.freedesktop.org

Patch coming to fix login’s STATE tracking for users to be correct when
starting a new session on a VT switch. This is important for PolicyKit
decisions about whether the user is active or online, as it affects the return
value of sd_uid_get_state().

See the commit message for full details.

See also: bug #90769, bug #67728, bug #76358.

---

The incorrect behaviour can be tested by:
 1. In an X11 terminal, `cat /run/systemd/users/$uid` gives SESSIONS=1
STATE=active.
 2. Switch VT, log in, `cat /run/systemd/users/$uid` gives SESSIONS="c2 1"
STATE=online.
 3. Switch back to X11 and cat again, gives SESSIONS="c2 1" STATE=active.
 4. Switch back to VT and cat again, gives SESSIONS="c2 1" STATE=active.

With some debugging logging added to logind, it seems that when switching to
the VT (step #2 above):
 A. Session 1 is switched from SESSION_ACTIVE to SESSION_ONLINE because of the
VT change.
 B. A new session (c2) is created, with initial state SESSION_OPENING.
 C. user_save() is called, which takes the maximum state of sessions 1 and c2,
which is SESSION_ONLINE.
 D. user_save() is not called again after session c2 switches from
SESSION_OPENING to SESSION_ACTIVE.

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