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session/logind: check for XDG_SESSION_ID first 

In order to support compositors running as systemd user units without display manager,
a mechanism for specifying session ID exactly must exist.

Checking for `XDG_SESSION_ID` mimics loginctl behaviour e95be7def2/src/login/loginctl.c (L856).
This commit is contained in:
Jan Chren 2019-05-22 15:25:42 +02:00 committed by Jan Chren (rindeal)
parent aa39dbd1e7
commit 151b7d1d94
1 changed files with 14 additions and 3 deletions
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17
backend/session/logind.c
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@ -538,15 +538,26 @@ static bool get_display_session(char **session_id) {
assert(session_id != NULL);
int ret;
char *type = NULL;
char *state = NULL;
char *xdg_session_id = getenv("XDG_SESSION_ID");
if (xdg_session_id) {
// This just checks whether the supplied session ID is valid
if (sd_session_is_active(xdg_session_id) < 0) {
wlr_log(WLR_ERROR, "Invalid XDG_SESSION_ID: '%s'", xdg_session_id);
goto error;
}
*session_id = strdup(xdg_session_id);
return true;
}
// If there's a session active for the current process then just use that
ret = sd_pid_get_session(getpid(), session_id);
if (ret == 0) {
return true;
}
char *type = NULL;
char *state = NULL;
// Find any active sessions for the user if the process isn't part of an
// active session itself
ret = sd_uid_get_display(getuid(), session_id);