loginctl: use bus_map_all_properties

(cherry picked from commit 5b7d1536d0c2ccf0b7688490f31c92c1e766ea44)

Related: #2156786

src/login/loginctl.c

@@ -47,6 +47,27 @@ static bool arg_ask_password = true;
 static unsigned arg_lines = 10;
 static OutputMode arg_output = OUTPUT_SHORT;
 
+typedef struct SessionStatusInfo {
+        const char *id;
+        uid_t uid;
+        const char *name;
+        struct dual_timestamp timestamp;
+        unsigned int vtnr;
+        const char *seat;
+        const char *tty;
+        const char *display;
+        bool remote;
+        const char *remote_host;
+        const char *remote_user;
+        const char *service;
+        pid_t leader;
+        const char *type;
+        const char *class;
+        const char *state;
+        const char *scope;
+        const char *desktop;
+} SessionStatusInfo;
+
 static OutputFlags get_output_flags(void) {
 
         return
@@ -112,6 +133,12 @@ static int show_table(Table *table, const char *word) {
 }
 
 static int list_sessions(int argc, char *argv[], void *userdata) {
+
+        static const struct bus_properties_map map[]  = {
+                { "TTY",    "s",    NULL,   offsetof(SessionStatusInfo, tty)    },
+                {},
+        };
+
         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
         _cleanup_(table_unrefp) Table *table = NULL;
@@ -148,39 +175,33 @@ static int list_sessions(int argc, char *argv[], void *userdata) {
 
         for (;;) {
                 _cleanup_(sd_bus_error_free) sd_bus_error e = SD_BUS_ERROR_NULL;
-                _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply_tty = NULL;
-                const char *id, *user, *seat, *object, *tty = NULL;
+                const char *id, *user, *seat, *object;
                 uint32_t uid;
+                _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
+                SessionStatusInfo i = {};
 
                 r = sd_bus_message_read(reply, "(susso)", &id, &uid, &user, &seat, &object);
                 if (r < 0)
                         return bus_log_parse_error(r);
                 if (r == 0)
                         break;
 
-                r = sd_bus_get_property(
-                                bus,
-                                "org.freedesktop.login1",
-                                object,
-                                "org.freedesktop.login1.Session",
-                                "TTY",
-                                &e,
-                                &reply_tty,
-                                "s");
-                if (r < 0)
-                        log_warning_errno(r, "Failed to get TTY for session %s: %s", id, bus_error_message(&e, r));
-                else {
-                        r = sd_bus_message_read(reply_tty, "s", &tty);
-                        if (r < 0)
-                                return bus_log_parse_error(r);
+                r = bus_map_all_properties(bus, "org.freedesktop.login1", object, map, BUS_MAP_BOOLEAN_AS_BOOL, &e, &m, &i);
+                if (r < 0) {
+                        if (sd_bus_error_has_name(&e, SD_BUS_ERROR_UNKNOWN_OBJECT))
+                                /* The session is already closed when we're querying the property */
+                                continue;
+
+                        log_warning_errno(r, "Failed to get properties of session %s, ignoring: %s",
+                                          id, bus_error_message(&e, r));
                 }
 
                 r = table_add_many(table,
                                    TABLE_STRING, id,
                                    TABLE_UINT32, uid,
                                    TABLE_STRING, user,
                                    TABLE_STRING, seat,
-                                   TABLE_STRING, strna(tty));
+                                   TABLE_STRING, strna(i.tty));
                 if (r < 0)
                         return log_error_errno(r, "Failed to add row to table: %m");
         }
@@ -341,27 +362,6 @@ static int show_unit_cgroup(sd_bus *bus, const char *interface, const char *unit
         return 0;
 }
 
-typedef struct SessionStatusInfo {
-        const char *id;
-        uid_t uid;
-        const char *name;
-        struct dual_timestamp timestamp;
-        unsigned int vtnr;
-        const char *seat;
-        const char *tty;
-        const char *display;
-        bool remote;
-        const char *remote_host;
-        const char *remote_user;
-        const char *service;
-        pid_t leader;
-        const char *type;
-        const char *class;
-        const char *state;
-        const char *scope;
-        const char *desktop;
-} SessionStatusInfo;
-
 typedef struct UserStatusInfo {
         uid_t uid;
         bool linger;