use current running DM preferences program

4 files changed, 222 insertions, 12 deletions

diff --git a/capplets/accessibility/at-properties/Makefile.am b/capplets/accessibility/at-properties/Makefile.am
index c1c06848..370d459e 100644
--- a/capplets/accessibility/at-properties/Makefile.am
+++ b/capplets/accessibility/at-properties/Makefile.am
@@ -8,6 +8,8 @@ BUILT_SOURCES = \
 nodist_mate_at_properties_SOURCES= $(BUILT_SOURCES)
 mate_at_properties_LDADD = $(AT_CAPPLET_LIBS) $(MATECC_CAPPLETS_LIBS) $(top_builddir)/capplets/common/libcommon.la
 mate_at_properties_SOURCES = \
+	dm-util.h	\
+	dm-util.c	\
 	main.c
 mate_at_properties_LDFLAGS = -export-dynamic
 
diff --git a/capplets/accessibility/at-properties/dm-util.c b/capplets/accessibility/at-properties/dm-util.c
new file mode 100644
index 00000000..79c5e6e5
--- /dev/null
+++ b/capplets/accessibility/at-properties/dm-util.c
@@ -0,0 +1,158 @@
+/* vi: set sw=4 ts=4 wrap ai: */
+/*
+ * dm-util.c: This file is part of mate-control-center.
+ *
+ * Copyright (C) 2019 Wu Xiaotian <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ * */
+
+#include <gio/gio.h>
+#include "dm-util.h"
+
+static GDBusProxy *get_sys_proxy (void)
+{
+    GError     *error = NULL;
+    GDBusProxy *proxy = NULL;
+
+    proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
+                                           G_DBUS_PROXY_FLAGS_NONE,
+                                           NULL,
+                                           "org.freedesktop.DBus",
+                                           "/org/freedesktop/DBus",
+                                           "org.freedesktop.DBus",
+                                           NULL,
+                                           &error);
+    if (proxy == NULL) {
+        g_warning ("Couldn't connect to system bus: %s", error->message);
+        g_error_free (error);
+    }
+    return proxy;
+}
+
+static gboolean dm_is_running (void)
+{
+    GDBusProxy *proxy;
+    GError *error = NULL;
+    GVariant *ret;
+    gboolean running = FALSE;
+
+    proxy = get_sys_proxy ();
+    if (proxy == NULL)
+        return FALSE;
+
+    ret = g_dbus_proxy_call_sync (proxy,
+                                  "NameHasOwner",
+                                  g_variant_new ("(s)", "org.freedesktop.DisplayManager"),
+                                  G_DBUS_CALL_FLAGS_NONE,
+                                  -1,
+                                  NULL,
+                                  &error);
+    if (ret == NULL) {
+        g_warning ("Couldn't call dbus method: %s", error->message);
+        g_error_free (error);
+    } else {
+        g_variant_get (ret, "(b)", &running);
+        g_variant_unref (ret);
+    }
+
+    if (proxy)
+        g_object_unref (proxy);
+
+    return running;
+}
+
+static gint
+dm_get_pid (GError **err)
+{
+    GDBusProxy *proxy;
+    GError *error = NULL;
+    GVariant *ret;
+    guint32 pid = 0;
+
+    proxy = get_sys_proxy ();
+    if (proxy == NULL)
+        return FALSE;
+
+    ret = g_dbus_proxy_call_sync (proxy,
+                                  "GetConnectionUnixProcessID",
+                                  g_variant_new ("(s)", "org.freedesktop.DisplayManager"),
+                                  G_DBUS_CALL_FLAGS_NONE,
+                                  -1,
+                                  NULL,
+                                  &error);
+    if (ret == NULL) {
+        g_propagate_error (err, error);
+    } else {
+        g_variant_get (ret, "(u)", &pid);
+        g_variant_unref (ret);
+    }
+
+    if (proxy)
+        g_object_unref (proxy);
+
+    return pid;
+}
+
+static gchar* get_cmdline_from_pid (gint pid)
+{
+    gchar path[255];
+    gchar *text = NULL;
+    gchar *cmdline = NULL;
+    GError *error = NULL;
+
+    g_snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
+    if (!g_file_get_contents (path, &text, NULL, &error)) {
+        g_warning ("get cmdline error: %s\n", error->message);
+        g_error_free (error);
+        return NULL;
+    } else {
+        cmdline = g_path_get_basename (text);
+        g_free (text);
+    }
+    return cmdline;
+}
+
+DMType dm_get_type(void)
+{
+    gint pid;
+    gchar *cmdline;
+
+    DMType dmtype = DM_TYPE_UNKNOWN;
+
+    if (!dm_is_running()) {
+        goto ret;
+    }
+
+    pid = dm_get_pid (NULL);
+    if (pid <= 1) {
+        goto ret;
+    }
+
+    cmdline = get_cmdline_from_pid (pid);
+    if (cmdline == NULL) {
+        goto ret;
+    }
+
+    if (g_strcmp0(cmdline, "lightdm") == 0) {
+        dmtype = DM_TYPE_LIGHTDM;
+    } else if (g_strcmp0(cmdline, "mdm") == 0) {
+        dmtype = DM_TYPE_MDM;
+    } else if (g_strcmp0(cmdline, "gdm") == 0) {
+        dmtype = DM_TYPE_GDM;
+    }
+    g_free (cmdline);
+ret:
+    return dmtype;
+}
diff --git a/capplets/accessibility/at-properties/dm-util.h b/capplets/accessibility/at-properties/dm-util.h
new file mode 100644
index 00000000..3b80b308
--- /dev/null
+++ b/capplets/accessibility/at-properties/dm-util.h
@@ -0,0 +1,38 @@
+/* vi: set sw=4 ts=4 wrap ai: */
+/*
+ * dm-util.h: This file is part of mate-control-center.
+ *
+ * Copyright (C) 2019 Wu Xiaotian <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ * */
+
+#ifndef __DM_UTIL_H__
+#define __DM_UTIL_H__  1
+
+G_BEGIN_DECLS
+
+typedef enum
+{
+    DM_TYPE_UNKNOWN,
+    DM_TYPE_LIGHTDM,
+    DM_TYPE_GDM,
+    DM_TYPE_MDM,
+} DMType;
+
+DMType dm_get_type(void);
+
+G_END_DECLS
+
+#endif /* __DM_UTIL_H__ */
diff --git a/capplets/accessibility/at-properties/main.c b/capplets/accessibility/at-properties/main.c
index 11e91bd3..44e07563 100644
--- a/capplets/accessibility/at-properties/main.c
+++ b/capplets/accessibility/at-properties/main.c
@@ -1,6 +1,7 @@
 #include <config.h>
 #include <gtk/gtk.h>
 #include <gio/gio.h>
+#include "dm-util.h"
 
 #include <dbus/dbus-glib.h>
 #include <dbus/dbus-glib-lowlevel.h>
@@ -33,7 +34,8 @@ create_builder (void)
 
     if (gtk_builder_add_from_resource (builder, "/org/mate/mcc/accessibility/at/at-enable-dialog.ui", &error)) {
         GObject *object;
-        gchar *prog;
+        gchar *prog = NULL;
+        DMType dm_type;
 
         object = gtk_builder_get_object (builder, "at_enable_image");
         gtk_image_set_from_file (GTK_IMAGE (object),
@@ -44,15 +46,18 @@ create_builder (void)
         gtk_image_set_from_file (GTK_IMAGE (object),
                                  PIXMAPDIR "/at-support.png");
 
-        prog = g_find_program_in_path ("lightdm-gtk-greeter-settings-pkexec");
-        if (prog == NULL) {
+        dm_type = dm_get_type();
+        if (dm_type == DM_TYPE_MDM) {
             prog = g_find_program_in_path ("mdmsetup");
-            if (prog == NULL) {
-                object = gtk_builder_get_object (builder, "login_button");
-                gtk_widget_hide (GTK_WIDGET (object));
-            }
+        } else if (dm_type == DM_TYPE_LIGHTDM) {
+            prog = g_find_program_in_path ("lightdm-gtk-greeter-settings-pkexec");
+        }
+        if (prog == NULL) {
+            object = gtk_builder_get_object (builder, "login_button");
+            gtk_widget_hide (GTK_WIDGET (object));
         }
         g_free (prog);
+
     } else {
         g_warning ("Could not load UI: %s", error->message);
         g_error_free (error);
@@ -84,13 +89,20 @@ cb_mouse_preferences (GtkDialog *dialog, gint response_id)
 static void
 cb_login_preferences (GtkDialog *dialog, gint response_id)
 {
-    gchar *prog;
-    prog = g_find_program_in_path ("lightdm-gtk-greeter-settings-pkexec");
-    if (prog == NULL) {
+    DMType dm_type;
+    gchar *prog = NULL;
+
+    dm_type = dm_get_type();
+    if (dm_type == DM_TYPE_MDM) {
         prog = g_find_program_in_path ("mdmsetup");
+    } else if (dm_type == DM_TYPE_LIGHTDM) {
+        prog = g_find_program_in_path ("lightdm-gtk-greeter-settings-pkexec");
+    }
+
+    if (prog != NULL) {
+        g_spawn_command_line_async (prog, NULL);
+        g_free(prog);
     }
-    g_spawn_command_line_async (prog, NULL);
-    g_free(prog);
 }
 
 /* get_session_bus(), get_sm_proxy(), and do_logout() are all