api,manager: new 'Version' property

This string shows the runtime version of the ModemManager daemon.

https://gitlab.freedesktop.org/mobile-broadband/ModemManager/issues/94

cli/mmcli-manager.c

@@ -51,6 +51,7 @@ typedef struct {
 static Context *ctx;
 
 /* Options */
+static gboolean get_daemon_version_flag;
 static gboolean list_modems_flag;
 static gboolean monitor_modems_flag;
 static gboolean scan_modems_flag;
@@ -62,6 +63,10 @@ static gboolean report_kernel_event_auto_scan;
 #endif
 
 static GOptionEntry entries[] = {
+    { "get-daemon-version", 'B', 0, G_OPTION_ARG_NONE, &get_daemon_version_flag,
+      "Get ModemManager daemon version",
+      NULL
+    },
     { "set-logging", 'G', 0, G_OPTION_ARG_STRING, &set_logging_str,
       "Set logging level in the ModemManager daemon",
       "[ERR,WARN,INFO,DEBUG]",
@@ -116,7 +121,8 @@ mmcli_manager_options_enabled (void)
     if (checked)
         return !!n_actions;
 
-    n_actions = (list_modems_flag +
+    n_actions = (get_daemon_version_flag +
+                 list_modems_flag +
                  monitor_modems_flag +
                  scan_modems_flag +
                  !!set_logging_str +
@@ -131,7 +137,9 @@ mmcli_manager_options_enabled (void)
         exit (EXIT_FAILURE);
     }
 
-    if (monitor_modems_flag) {
+    if (get_daemon_version_flag)
+        mmcli_force_sync_operation ();
+    else if (monitor_modems_flag) {
         if (mmcli_output_get () != MMC_OUTPUT_TYPE_HUMAN) {
             g_printerr ("error: modem monitoring not available in keyvalue output\n");
             exit (EXIT_FAILURE);
@@ -495,6 +503,12 @@ mmcli_manager_run_synchronous (GDBusConnection *connection)
     ctx = g_new0 (Context, 1);
     ctx->manager = mmcli_get_manager_sync (connection);
 
+    /* Get daemon version? */
+    if (get_daemon_version_flag) {
+        g_print ("ModemManager daemon %s running\n", mm_manager_get_version (ctx->manager));
+        return;
+    }
+
     /* Setup operation timeout */
     mmcli_force_operation_timeout (mm_manager_peek_proxy (ctx->manager));