logind: hook uaccess into udev by default

src/.gitignore

@@ -2,3 +2,4 @@ org.freedesktop.systemd1.policy
 gnome-ask-password-agent.c
 systemd-interfaces.c
 systemadm.c
+73-seat-late.rules

src/73-seat-late.rules.in

@@ -12,4 +12,6 @@ ENV{ID_SEAT}=="", IMPORT{parent}="ID_SEAT"
 
 ENV{ID_SEAT}!="", TAG+="$env{ID_SEAT}"
 
+TAG=="uaccess", RUN+="@rootlibexecdir@/systemd-uaccess $env{DEVNAME} $env{ID_SEAT}"
+
 LABEL="seat_late_end"

src/logind.h

@@ -37,7 +37,6 @@
  * spawn user systemd
  * direct client API
  * verify access to SetIdleHint
- * hook up ACL tool for udev
  *
  * udev:
  * drop redundant udev_device_get_is_initialized() use as soon as libudev is fixed

src/uaccess.c

@@ -36,14 +36,14 @@ int main(int argc, char *argv[]) {
         log_parse_environment();
         log_open();
 
-        if (argc != 2) {
-                log_error("This program expects two argument.");
+        if (argc < 2 || argc > 3) {
+                log_error("This program expects one or two arguments.");
                 r = -EINVAL;
                 goto finish;
         }
 
         path = argv[1];
-        seat = argv[2];
+        seat = argc >= 3 ? argv[2] : "seat0";
 
         p = strappend("/run/systemd/seats/", seat);
         if (!p) {