File gdm-sysconfig-settings.patch of Package gdm

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File gdm-sysconfig-settings.patch of Package gdm (Revision 4e325da67c08327c769d4662bac8c436)

Currently displaying revision 4e325da67c08327c769d4662bac8c436 , Show latest

Index: b/common/Makefile.am
===================================================================
--- a/common/Makefile.am	2018-01-19 20:09:39.075556951 +0800
+++ b/common/Makefile.am	2018-01-19 20:10:57.572967891 +0800
@@ -52,11 +52,15 @@
 	gdm-settings-backend.h	\
 	gdm-settings-desktop-backend.c 	\
 	gdm-settings-desktop-backend.h	\
+	gdm-settings-system-backend.c 	\
+	gdm-settings-system-backend.h	\
 	gdm-settings-keys.h	\
 	gdm-settings-utils.h	\
 	gdm-settings-utils.c	\
 	gdm-settings-direct.c 	\
 	gdm-settings-direct.h	\
+	gdm-sysconfig.c         \
+	gdm-sysconfig.h         \
 	gdm-log.h		\
 	gdm-log.c		\
 	$(MKDTEMP_FILES) 	\
Index: b/common/gdm-settings-system-backend.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ b/common/gdm-settings-system-backend.c	2018-01-19 20:10:57.572967891 +0800
@@ -0,0 +1,369 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2008 Hans Petter Jansson <hpj@copyleft.no>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <signal.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <glib.h>
+#include <glib/gi18n.h>
+#include <glib/gstdio.h>
+#include <glib-object.h>
+
+#include "gdm-sysconfig.h"
+#include "gdm-settings-keys.h"
+#include "gdm-settings-system-backend.h"
+
+#include "gdm-log.h"
+
+#define SYSCONFIG_AUTOLOGIN_KEY         "DISPLAYMANAGER_AUTOLOGIN"
+#define SYSCONFIG_TCP_OPEN_KEY          "DISPLAYMANAGER_XSERVER_TCP_PORT_6000_OPEN"
+#define SYSCONFIG_XDMCP_KEY             "DISPLAYMANAGER_REMOTE_ACCESS"
+#define SYSCONFIG_STARTS_XSERVER_KEY    "DISPLAYMANAGER_STARTS_XSERVER"
+/* Keys from sysconfig that have no equivalent in GDM:
+ *   - DISPLAYMANAGER_ROOT_LOGIN_REMOTE
+ *   - DISPLAYMANAGER_PASSWORD_LESS_LOGIN
+ *   - DISPLAYMANAGER_AD_INTEGRATION
+ *   - DISPLAYMANAGER_SHUTDOWN (handled by ConsoleKit)
+ */
+
+#define GDM_SETTINGS_SYSTEM_BACKEND_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GDM_TYPE_SETTINGS_SYSTEM_BACKEND, GdmSettingsSystemBackendPrivate))
+
+struct GdmSettingsSystemBackendPrivate
+{
+        char       *filename;
+        gchar     **lines;
+        guint       save_id;
+
+        gboolean    dirty;
+        gboolean    dirty_autologin;
+        gboolean    dirty_autologin_user;
+        gboolean    dirty_tcp_open;
+        gboolean    dirty_xdmcp;
+        gboolean    dirty_show_local_greeter;
+
+        gchar      *set_autologin_user;
+        gboolean    set_autologin_enabled;
+
+        gboolean    set_tcp_open;
+        gboolean    set_xdmcp;
+        gboolean    set_show_local_greeter;
+};
+
+static void     gdm_settings_system_backend_class_init (GdmSettingsSystemBackendClass *klass);
+static void     gdm_settings_system_backend_init       (GdmSettingsSystemBackend      *settings_system_backend);
+static void     gdm_settings_system_backend_finalize   (GObject                       *object);
+
+G_DEFINE_TYPE (GdmSettingsSystemBackend, gdm_settings_system_backend, GDM_TYPE_SETTINGS_BACKEND)
+
+static gboolean
+gdm_settings_system_backend_get_value (GdmSettingsBackend *backend,
+                                       const char         *key,
+                                       char              **value,
+                                       GError            **error)
+{
+        GdmSettingsSystemBackend        *system_backend = (GdmSettingsSystemBackend *) backend;
+        GdmSettingsSystemBackendPrivate *priv;
+        gchar                           *val;
+        gboolean                         ret;
+
+        g_return_val_if_fail (GDM_IS_SETTINGS_BACKEND (backend), FALSE);
+        g_return_val_if_fail (key != NULL, FALSE);
+
+        priv = system_backend->priv;
+        val = NULL;
+        ret = FALSE;
+
+        if (value != NULL) {
+                *value = NULL;
+        }
+
+        if (!strcasecmp (key, GDM_KEY_AUTO_LOGIN_ENABLE)) {
+                if (priv->dirty_autologin) {
+                        val = g_strdup (priv->set_autologin_enabled ? "true" : "false");
+                } else {
+                        const gchar *new_val;
+
+                        val = gdm_sysconfig_get_value ((const gchar **) priv->lines, SYSCONFIG_AUTOLOGIN_KEY);
+
+                        new_val = (val && *val) ? "true" : "false";
+                        g_free (val);
+                        val = g_strdup (new_val);
+                }
+        } else if (!strcasecmp (key, GDM_KEY_AUTO_LOGIN_USER)) {
+                if (priv->dirty_autologin_user) {
+                        val = g_strdup (priv->set_autologin_user);
+                } else {
+                        val = gdm_sysconfig_get_value ((const gchar **) priv->lines, SYSCONFIG_AUTOLOGIN_KEY);
+                }
+        } else if (!strcasecmp (key, GDM_KEY_DISALLOW_TCP)) {
+                /* beware: that's the opposite of the sysconfig key */
+                if (priv->dirty_tcp_open) {
+                        val = g_strdup (priv->set_tcp_open ? "false" : "true");
+                } else {
+                        gboolean tcp_open;
+
+                        if (gdm_sysconfig_get_value_boolean ((const gchar **) priv->lines, SYSCONFIG_TCP_OPEN_KEY, &tcp_open)) {
+                                val = g_strdup (tcp_open ? "false" : "true");
+                        }
+                }
+        } else if (!strcasecmp (key, GDM_KEY_XDMCP_ENABLE)) {
+                if (priv->dirty_xdmcp) {
+                        val = g_strdup (priv->set_xdmcp ? "true" : "false");
+                } else {
+                        gboolean xdmcp;
+
+                        if (gdm_sysconfig_get_value_boolean ((const gchar **) priv->lines, SYSCONFIG_XDMCP_KEY, &xdmcp)) {
+                                val = g_strdup (xdmcp ? "true" : "false");
+                        }
+                }
+        } else if (!strcasecmp (key, GDM_KEY_SHOW_LOCAL_GREETER)) {
+                if (priv->dirty_show_local_greeter) {
+                        val = g_strdup (priv->set_xdmcp ? "true" : "false");
+                } else {
+                        gboolean local_greeter;
+
+                        if (gdm_sysconfig_get_value_boolean ((const gchar **) priv->lines, SYSCONFIG_STARTS_XSERVER_KEY, &local_greeter)) {
+                                val = g_strdup (local_greeter ? "true" : "false");
+                        }
+                }
+        } else {
+                g_set_error (error, GDM_SETTINGS_BACKEND_ERROR, GDM_SETTINGS_BACKEND_ERROR_KEY_NOT_FOUND, "Key not found");
+                goto out;
+        }
+
+        ret = (val != NULL);
+
+        if (value != NULL && val != NULL && *val != '\0') {
+                *value = val;
+        } else {
+                g_free (val);
+        }
+
+ out:
+        return ret;
+}
+
+static void
+save_settings (GdmSettingsSystemBackend *backend)
+{
+        if (! backend->priv->dirty) {
+                return;
+        }
+
+        g_debug ("Saving settings to %s", backend->priv->filename);
+
+        if (backend->priv->dirty_autologin || backend->priv->dirty_autologin_user) {
+                if (!backend->priv->dirty_autologin) {
+                        gchar *val;
+
+                        val = gdm_sysconfig_get_value ((const gchar **) backend->priv->lines, SYSCONFIG_AUTOLOGIN_KEY);
+                        backend->priv->set_autologin_enabled = (val && *val);
+                        g_free (val);
+                }
+
+                if (!backend->priv->set_autologin_enabled) {
+                        g_free (backend->priv->set_autologin_user);
+                        backend->priv->set_autologin_user = g_strdup ("");
+                } else if (!backend->priv->dirty_autologin_user) {
+                        g_free (backend->priv->set_autologin_user);
+                        backend->priv->set_autologin_user = gdm_sysconfig_get_value ((const gchar **) backend->priv->lines, SYSCONFIG_AUTOLOGIN_KEY);
+                }
+
+                if (!gdm_sysconfig_set_value (backend->priv->lines, SYSCONFIG_AUTOLOGIN_KEY, backend->priv->set_autologin_user))
+                        g_warning ("Unable to set key %s to '%s'.", SYSCONFIG_AUTOLOGIN_KEY,
+                                   backend->priv->set_autologin_user);
+        }
+
+        if (backend->priv->dirty_tcp_open) {
+                if (!gdm_sysconfig_set_value_boolean (backend->priv->lines, SYSCONFIG_TCP_OPEN_KEY, backend->priv->set_tcp_open))
+                        g_warning ("Unable to set key %s to '%s'.", SYSCONFIG_TCP_OPEN_KEY,
+                                   backend->priv->set_tcp_open ? "yes" : "no");
+        }
+
+        if (backend->priv->dirty_xdmcp) {
+                if (!gdm_sysconfig_set_value_boolean (backend->priv->lines, SYSCONFIG_XDMCP_KEY, backend->priv->set_xdmcp))
+                        g_warning ("Unable to set key %s to '%s'.", SYSCONFIG_XDMCP_KEY,
+                                   backend->priv->set_xdmcp ? "yes" : "no");
+        }
+
+        if (backend->priv->dirty_show_local_greeter) {
+                if (!gdm_sysconfig_set_value_boolean (backend->priv->lines, SYSCONFIG_STARTS_XSERVER_KEY, backend->priv->set_show_local_greeter))
+                        g_warning ("Unable to set key %s to '%s'.", SYSCONFIG_STARTS_XSERVER_KEY,
+                                   backend->priv->set_show_local_greeter? "yes" : "no");
+        }
+
+        if (!gdm_sysconfig_save_file (backend->priv->filename, backend->priv->lines))
+                g_warning ("Unable to save settings to %s.", backend->priv->filename);
+
+        backend->priv->dirty                    = FALSE;
+        backend->priv->dirty_autologin          = FALSE;
+        backend->priv->dirty_autologin_user     = FALSE;
+        backend->priv->dirty_tcp_open           = FALSE;
+        backend->priv->dirty_xdmcp              = FALSE;
+        backend->priv->dirty_show_local_greeter = FALSE;
+}
+
+static gboolean
+save_settings_timer (GdmSettingsSystemBackend *backend)
+{
+        save_settings (backend);
+        backend->priv->save_id = 0;
+        return FALSE;
+}
+
+static void
+queue_save (GdmSettingsSystemBackend *backend)
+{
+        if (! backend->priv->dirty) {
+                return;
+        }
+
+        if (backend->priv->save_id != 0) {
+                /* already pending */
+                return;
+        }
+
+        backend->priv->save_id = g_timeout_add_seconds (5, (GSourceFunc)save_settings_timer, backend);
+}
+
+static gboolean
+value_to_boolean (const char *value)
+{
+        gchar t = 0;
+
+        if (value)
+                t = g_ascii_tolower (*value);
+
+        return (t == 'y' || t == 't');
+}
+
+static gboolean
+gdm_settings_system_backend_set_value (GdmSettingsBackend *backend,
+                                       const char         *key,
+                                       const char         *value,
+                                       GError            **error)
+{
+        GdmSettingsSystemBackend        *system_backend = (GdmSettingsSystemBackend *) backend;
+        GdmSettingsSystemBackendPrivate *priv;
+        gchar                           *old_val = NULL;
+
+        g_return_val_if_fail (GDM_IS_SETTINGS_BACKEND (backend), FALSE);
+        g_return_val_if_fail (key != NULL, FALSE);
+
+        priv = system_backend->priv;
+
+        gdm_settings_system_backend_get_value (backend, key, &old_val, NULL);
+
+        if (!strcasecmp (key, GDM_KEY_AUTO_LOGIN_ENABLE)) {
+                priv->set_autologin_enabled = value_to_boolean (value);
+                GDM_SETTINGS_SYSTEM_BACKEND (backend)->priv->dirty_autologin = TRUE;
+        } else if (!strcasecmp (key, GDM_KEY_AUTO_LOGIN_USER)) {
+                g_free (priv->set_autologin_user);
+                priv->set_autologin_user = g_strdup (value);
+                GDM_SETTINGS_SYSTEM_BACKEND (backend)->priv->dirty_autologin_user = TRUE;
+        } else if (!strcasecmp (key, GDM_KEY_DISALLOW_TCP)) {
+                /* beware: that's the opposite of the sysconfig key */
+                priv->set_tcp_open = !value_to_boolean (value);
+                GDM_SETTINGS_SYSTEM_BACKEND (backend)->priv->dirty_tcp_open = TRUE;
+        } else if (!strcasecmp (key, GDM_KEY_XDMCP_ENABLE)) {
+                priv->set_xdmcp = value_to_boolean (value);
+                GDM_SETTINGS_SYSTEM_BACKEND (backend)->priv->dirty_xdmcp = TRUE;
+        } else if (!strcasecmp (key, GDM_KEY_SHOW_LOCAL_GREETER)) {
+                priv->set_show_local_greeter = value_to_boolean (value);
+                GDM_SETTINGS_SYSTEM_BACKEND (backend)->priv->dirty_show_local_greeter = TRUE;
+        } else {
+                g_set_error (error, GDM_SETTINGS_BACKEND_ERROR, GDM_SETTINGS_BACKEND_ERROR_KEY_NOT_FOUND, "Key not found");
+                return FALSE;
+        }
+
+        GDM_SETTINGS_SYSTEM_BACKEND (backend)->priv->dirty = TRUE;
+        queue_save (GDM_SETTINGS_SYSTEM_BACKEND (backend));
+
+        gdm_settings_backend_value_changed (backend, key, old_val, value);
+
+        g_free (old_val);
+
+        return TRUE;
+}
+
+static void
+gdm_settings_system_backend_class_init (GdmSettingsSystemBackendClass *klass)
+{
+        GObjectClass            *object_class = G_OBJECT_CLASS (klass);
+        GdmSettingsBackendClass *backend_class = GDM_SETTINGS_BACKEND_CLASS (klass);
+
+        object_class->finalize = gdm_settings_system_backend_finalize;
+
+        backend_class->get_value = gdm_settings_system_backend_get_value;
+        backend_class->set_value = gdm_settings_system_backend_set_value;
+
+        g_type_class_add_private (klass, sizeof (GdmSettingsSystemBackendPrivate));
+}
+
+static void
+gdm_settings_system_backend_init (GdmSettingsSystemBackend *backend)
+{
+        backend->priv = GDM_SETTINGS_SYSTEM_BACKEND_GET_PRIVATE (backend);
+
+        backend->priv->filename = g_strdup ("/etc/sysconfig/displaymanager");
+        backend->priv->lines = gdm_sysconfig_load_file (backend->priv->filename);
+
+        if (!backend->priv->lines) {
+                g_warning ("Unable to load file '%s'", backend->priv->filename);
+        }
+}
+
+static void
+gdm_settings_system_backend_finalize (GObject *object)
+{
+        GdmSettingsSystemBackend *backend;
+
+        g_return_if_fail (object != NULL);
+        g_return_if_fail (GDM_IS_SETTINGS_SYSTEM_BACKEND (object));
+
+        backend = GDM_SETTINGS_SYSTEM_BACKEND (object);
+
+        g_return_if_fail (backend->priv != NULL);
+
+        save_settings (backend);
+        g_strfreev (backend->priv->lines);
+        g_free (backend->priv->filename);
+        g_free (backend->priv->set_autologin_user);
+
+        G_OBJECT_CLASS (gdm_settings_system_backend_parent_class)->finalize (object);
+}
+
+GdmSettingsBackend *
+gdm_settings_system_backend_new (void)
+{
+        GObject *object;
+
+        object = g_object_new (GDM_TYPE_SETTINGS_SYSTEM_BACKEND, NULL);
+
+        return GDM_SETTINGS_BACKEND (object);
+}
Index: b/common/gdm-settings-system-backend.h
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ b/common/gdm-settings-system-backend.h	2018-01-19 20:10:57.572967891 +0800
@@ -0,0 +1,56 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2008 Hans Petter Jansson <hpj@copyleft.no>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+
+#ifndef __GDM_SETTINGS_SYSTEM_BACKEND_H
+#define __GDM_SETTINGS_SYSTEM_BACKEND_H
+
+#include <glib-object.h>
+#include "gdm-settings-backend.h"
+
+G_BEGIN_DECLS
+
+#define GDM_TYPE_SETTINGS_SYSTEM_BACKEND         (gdm_settings_system_backend_get_type ())
+#define GDM_SETTINGS_SYSTEM_BACKEND(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), GDM_TYPE_SETTINGS_SYSTEM_BACKEND, GdmSettingsSystemBackend))
+#define GDM_SETTINGS_SYSTEM_BACKEND_CLASS(k)     (G_TYPE_CHECK_CLASS_CAST((k), GDM_TYPE_SETTINGS_SYSTEM_BACKEND, GdmSettingsSystemBackendClass))
+#define GDM_IS_SETTINGS_SYSTEM_BACKEND(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), GDM_TYPE_SETTINGS_SYSTEM_BACKEND))
+#define GDM_IS_SETTINGS_SYSTEM_BACKEND_CLASS(k)  (G_TYPE_CHECK_CLASS_TYPE ((k), GDM_TYPE_SETTINGS_SYSTEM_BACKEND))
+#define GDM_SETTINGS_SYSTEM_BACKEND_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), GDM_TYPE_SETTINGS_SYSTEM_BACKEND, GdmSettingsSystemBackendClass))
+
+typedef struct GdmSettingsSystemBackendPrivate GdmSettingsSystemBackendPrivate;
+
+typedef struct
+{
+        GdmSettingsBackend               parent;
+        GdmSettingsSystemBackendPrivate *priv;
+} GdmSettingsSystemBackend;
+
+typedef struct
+{
+        GdmSettingsBackendClass   parent_class;
+} GdmSettingsSystemBackendClass;
+
+GType                      gdm_settings_system_backend_get_type        (void);
+
+GdmSettingsBackend        *gdm_settings_system_backend_new             (void);
+
+G_END_DECLS
+
+#endif /* __GDM_SETTINGS_SYSTEM_BACKEND_H */
Index: b/common/gdm-settings.c
===================================================================
--- a/common/gdm-settings.c	2018-01-19 20:10:02.587982412 +0800
+++ b/common/gdm-settings.c	2018-01-19 20:12:09.186231713 +0800
@@ -38,6 +38,7 @@
 #include "gdm-settings.h"
 
 #include "gdm-settings-desktop-backend.h"
+#include "gdm-settings-system-backend.h"
 
 #define GDM_SETTINGS_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GDM_TYPE_SETTINGS, GdmSettingsPrivate))
 
@@ -198,6 +199,8 @@
         if (backend)
                 settings->priv->backends = g_list_prepend (NULL, backend);
 
+        settings->priv->backends = g_list_prepend (settings->priv->backends, gdm_settings_system_backend_new ());
+
         backend = gdm_settings_desktop_backend_new (GDM_RUNTIME_CONF);
         if (backend)
                 settings->priv->backends = g_list_prepend (settings->priv->backends, backend);
Index: b/common/gdm-sysconfig.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ b/common/gdm-sysconfig.c	2018-01-19 20:10:57.572967891 +0800
@@ -0,0 +1,484 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2008 Hans Petter Jansson <hpj@novell.com>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+/* Parser for shell-script-like key-value files. Far from complete, but
+ * deals with a couple of common shell oddities. For instance, the following
+ * are parsed correctly:
+ *
+ * KEY=value\0
+ * KEY = value#comment\0
+ * KEY = " value with spaces"  \0
+ * KEY = ' it\'s a value with "embedded" quotes'\0
+ * KEY = "if quotes aren't closed, we assume the string ends at EOL\0
+ *
+ * It should be good enough for the config files in /etc/sysconfig/.
+ */
+
+#include "config.h"
+
+#include <unistd.h>
+#include <string.h>
+
+#include <glib.h>
+#include <glib/gi18n.h>
+#include <glib/gstdio.h>
+
+#include "gdm-sysconfig.h"
+
+#define SPACE_CHARS     " \t"
+#define KEY_ALLOW_CHARS "_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+
+static gchar **
+load_settings_file (const gchar *file_name)
+{
+        GIOChannel *channel;
+        GPtrArray  *lines;
+        gchar      *str;
+
+        g_debug ("Loading settings from %s", file_name);
+
+        channel = g_io_channel_new_file (file_name, "r", NULL);
+        if (!channel) {
+                g_debug ("Failed to open %s", file_name);
+                return NULL;
+        }
+
+        lines = g_ptr_array_new ();
+
+        while (g_io_channel_read_line (channel, &str, NULL, NULL, NULL) != G_IO_STATUS_EOF) {
+                if (str) {
+                        gchar *p0;
+
+                        /* Remove line separators */
+
+                        for (p0 = str + strlen (str) - 1; p0 >= str && strchr ("\r\n", *p0); p0--)
+                                *p0 = '\0';
+
+                        g_ptr_array_add (lines, str);
+                        g_debug ("%s", str);
+                } else {
+                        g_ptr_array_add (lines, g_strdup (""));
+                        g_debug ("%s", "");
+                }
+        }
+
+        g_io_channel_shutdown (channel, FALSE, NULL);
+        g_io_channel_unref (channel);
+
+        g_ptr_array_add (lines, NULL);
+
+        return (gchar **) g_ptr_array_free (lines, FALSE);
+}
+
+static gboolean
+save_settings_file (const gchar *file_name, gchar **lines)
+{
+        GIOStatus   last_status = G_IO_STATUS_ERROR;
+        GIOChannel *channel     = NULL;
+        gchar      *temp_file_name;
+        gint        i;
+
+        temp_file_name = g_strdup_printf ("%s.new.%u", file_name, g_random_int ());
+
+        channel = g_io_channel_new_file (temp_file_name, "w", NULL);
+        if (!channel)
+                goto out;
+
+        if (!lines)
+                goto out;
+
+        for (i = 0; lines [i]; i++) {
+                gsize bytes_written;
+
+                if (lines [i] [0] != '\0')
+                        last_status = g_io_channel_write_chars (channel,
+                                                                lines [i], strlen (lines [i]),
+                                                                &bytes_written,
+                                                                NULL);
+
+                if (last_status != G_IO_STATUS_NORMAL)
+                        break;
+
+                last_status = g_io_channel_write_unichar (channel, '\n', NULL);
+
+                if (last_status != G_IO_STATUS_NORMAL)
+                        break;
+        }
+
+out:
+        if (channel) {
+                g_io_channel_shutdown (channel, FALSE, NULL);
+                g_io_channel_unref (channel);
+        }
+
+        if (last_status == G_IO_STATUS_NORMAL && g_rename (temp_file_name, file_name) != 0)
+                last_status = G_IO_STATUS_ERROR;
+
+        g_free (temp_file_name);
+        return last_status == G_IO_STATUS_NORMAL ? TRUE : FALSE;
+}
+
+static const gchar *
+skip_from_start_to_key (const gchar *line)
+{
+        const gchar *p0;
+
+        /* Skip initial space */
+
+        p0 = line + strspn (line, SPACE_CHARS);
+
+        /* Ignore comments and other junk */
+
+        if (*p0 && strchr (KEY_ALLOW_CHARS, *p0))
+                return p0;
+
+        return NULL;
+}
+
+static const gchar *
+skip_from_start_to_value_of_key (const gchar *line, const gchar *key_normal, gint key_len)
+{
+        const gchar *p0, *p1;
+        gchar       *potential_key_normal;
+        gboolean     result;
+
+        p0 = skip_from_start_to_key (line);
+        if (!p0)
+                return NULL;
+
+        /* There's at least one key-like character, figure out how many */
+
+        p1 = p0 + strspn (p0, KEY_ALLOW_CHARS);
+
+        /* Is this the key we're looking for? */
+
+        if (p1 - p0 != key_len)
+                return NULL;
+
+        potential_key_normal = g_ascii_strdown (p0, p1 - p0);
+        result = strcmp (key_normal, potential_key_normal) == 0 ? TRUE : FALSE;
+        g_free (potential_key_normal);
+
+        if (!result)
+                return NULL;
+
+        /* It's the right key; skip over key-value separator */
+
+        p0 = p1 + strspn (p1, SPACE_CHARS);
+        if (*p0 != '=')
+                return NULL;
+
+        p0++;
+        p0 += strspn (p0, SPACE_CHARS);
+
+        return p0;
+}
+
+static const gchar *
+skip_over_value (const gchar *value_start, gchar *quotes_out)
+{
+        const gchar *p0 = value_start;
+        const gchar *p1;
+        gchar        quotes;
+
+        /* Is the value quoted? */
+
+        quotes = *p0;
+        if (quotes == '\'' || quotes == '"') {
+                /* Quoted sequence opened; find closing quote, but skip over escaped ones. If
+                 * there's no closing quote on this line, assume the EOL closes it. */
+
+                *quotes_out = quotes;
+
+                p1 = p0;
+                do {
+                        p1++;
+                        p1 = strchr (p1, quotes);
+                        if (!p1) {
+                                /* Hit EOL */
+
+                                p1 = p0 + strlen (p0) - 1;
+                                break;
+                        }
+                } while (*(p1 - 1) == '\\');
+        } else {
+                /* No quotes; look for comment or EOL */
+
+                *quotes_out = 0;
+
+                p1 = strchr (p0, '#');
+                if (!p1)
+                        p1 = p0 + strlen (p0);
+
+                for (p1--; p1 >= p0; p1--)
+                        if (!strchr (SPACE_CHARS, *p1))
+                                break;
+        }
+
+        return p1 + 1;
+}
+
+static gchar *
+get_value_of_key (const gchar *line, const gchar *key_normal, gint key_len)
+{
+        const gchar *p0, *p1;
+        gchar        quotes;
+        gchar       *value;
+        gchar       *temp;
+
+        p0 = skip_from_start_to_value_of_key (line, key_normal, key_len);
+        if (!p0)
+                return NULL;
+
+        p1 = skip_over_value (p0, &quotes);
+
+        if (quotes != 0) {
+                if (p1 - p0 > 2) {
+                        temp = g_strndup (p0 + 1, p1 - p0 - 2);
+                        value = g_strcompress (temp);
+                        g_free (temp);
+                } else {
+                        value = g_strdup ("");
+                }
+        } else {
+                temp = g_strndup (p0, p1 - p0);
+                value = g_strcompress (temp);
+                g_free (temp);
+                g_strchomp (value);
+        }
+
+        return value;
+}
+
+static gchar *
+get_value (const gchar **lines, const gchar *key)
+{
+        gchar *value = NULL;
+        gchar *key_normal;
+        gint   key_len;
+        gint   i;
+
+        g_debug ("Getting value of %s", key);
+
+        if (!lines) {
+                g_debug ("Missing configuration data");
+                return NULL;
+        }
+
+        key_normal = g_ascii_strdown (key, -1);
+        key_len    = strlen (key_normal);
+
+        for (i = 0; lines [i]; i++) {
+                value = get_value_of_key (lines [i], key_normal, key_len);
+                if (value)
+                        break;
+        }
+
+        g_free (key_normal);
+
+        g_debug ("Got value of %s: %s", key, value);
+
+        return value;
+}
+
+static gchar *
+set_value_of_key (const gchar *line, const gchar *key_normal, gint key_len, const gchar *key, const gchar *value)
+{
+        const gchar *p0, *p1, *p2;
+        gchar        quotes;
+        gchar       *escaped_value;
+        gchar       *quoted_escaped_value;
+        gint         quoted_escaped_value_len;
+        gchar       *new_line;
+        gint         len;
+
+        p0 = skip_from_start_to_value_of_key (line, key_normal, key_len);
+        if (!p0)
+                return NULL;
+
+        escaped_value = g_strescape (value, "");
+        quoted_escaped_value = g_strdup_printf ("\"%s\"", escaped_value);
+        g_free (escaped_value);
+        quoted_escaped_value_len = strlen (quoted_escaped_value);
+
+        p1 = skip_over_value (p0, &quotes);
+        p2 = p1 + strlen (p1);
+        len = (p0 - line) + quoted_escaped_value_len + (p2 - p1);
+
+        new_line = g_malloc (len + 1);
+        memcpy (new_line,                                          line,                 p0 - line);
+        memcpy (new_line + (p0 - line),                            quoted_escaped_value, quoted_escaped_value_len);
+        memcpy (new_line + (p0 - line) + quoted_escaped_value_len, p1,                   p2 - p1);
+
+        *(new_line + len) = '\0';
+
+        g_free (quoted_escaped_value);
+
+        return new_line;
+}
+
+static gboolean
+set_value (gchar **lines, const gchar *key, const gchar *value)
+{
+        gboolean  result = FALSE;
+        gchar    *key_normal;
+        gint      key_len;
+        gint      i;
+
+        if (!lines)
+                return FALSE;
+
+        key_normal = g_ascii_strdown (key, -1);
+        key_len    = strlen (key_normal);
+
+        for (i = 0; lines [i]; i++) {
+                gchar *new_line;
+
+                new_line = set_value_of_key (lines [i], key_normal, key_len, key, value);
+                if (new_line) {
+                        g_free (lines [i]);
+                        lines [i] = new_line;
+                        result = TRUE;
+                        break;
+                }
+        }
+
+        g_free (key_normal);
+
+        return result;
+}
+
+gchar **
+gdm_sysconfig_load_file (const gchar *file_name)
+{
+        g_return_val_if_fail (file_name != NULL, NULL);
+
+        return load_settings_file (file_name);
+}
+
+gboolean
+gdm_sysconfig_save_file (const gchar *file_name, const gchar **sysconfig)
+{
+        g_return_val_if_fail (file_name != NULL, FALSE);
+        g_return_val_if_fail (sysconfig != NULL, FALSE);
+
+        return save_settings_file (file_name, sysconfig);
+}
+
+gchar *
+gdm_sysconfig_get_value (const gchar **sysconfig, const gchar *key)
+{
+        g_return_val_if_fail (sysconfig != NULL, NULL);
+        g_return_val_if_fail (key != NULL, NULL);
+
+        return get_value (sysconfig, key);
+}
+
+gboolean
+gdm_sysconfig_set_value (gchar **sysconfig, const gchar *key, const gchar *value)
+{
+        g_return_val_if_fail (sysconfig != NULL, FALSE);
+        g_return_val_if_fail (key != NULL, FALSE);
+        g_return_val_if_fail (value != NULL, FALSE);
+
+        return set_value (sysconfig, key, value);
+}
+
+gboolean
+gdm_sysconfig_get_value_boolean (const gchar **sysconfig, const gchar *key, gboolean *value)
+{
+	char     *val;
+	gboolean  val_bool;
+
+        g_return_val_if_fail (sysconfig != NULL, FALSE);
+        g_return_val_if_fail (key != NULL, FALSE);
+
+        val = get_value (sysconfig, key);
+	if (val == NULL) {
+		return FALSE;
+	}
+
+        if (!strcasecmp (val, "yes")) {
+		val_bool = TRUE;
+	} else if (!strcasecmp (val, "no")) {
+		val_bool = FALSE;
+	} else {
+		g_free (val);
+		return FALSE;
+	}
+
+	g_free (val);
+
+	if (value != NULL) {
+		*value = val_bool;
+	}
+
+	return TRUE;
+}
+
+gboolean
+gdm_sysconfig_set_value_boolean (gchar **sysconfig, const gchar *key, gboolean value)
+{
+        g_return_val_if_fail (sysconfig != NULL, FALSE);
+        g_return_val_if_fail (key != NULL, FALSE);
+
+        return set_value (sysconfig, key, value ? "yes" : "no");
+}
+
+gchar *
+gdm_sysconfig_load_value (const gchar *file_name, const gchar *key)
+{
+        gchar **lines;
+        gchar  *value;
+
+        g_return_val_if_fail (file_name != NULL, NULL);
+        g_return_val_if_fail (key != NULL, NULL);
+
+        lines = load_settings_file (file_name);
+        if (!lines)
+                return NULL;
+
+        value = get_value (lines, key);
+
+        g_strfreev (lines);
+        return value;
+}
+
+gboolean
+gdm_sysconfig_save_value (const gchar *file_name, const gchar *key, const gchar *value)
+{
+        gchar    **lines;
+        gboolean   result;
+
+        g_return_val_if_fail (file_name != NULL, FALSE);
+        g_return_val_if_fail (key != NULL, FALSE);
+        g_return_val_if_fail (value != NULL, FALSE);
+
+        lines = load_settings_file (file_name);
+        if (!lines)
+                return FALSE;
+
+        result = set_value (lines, key, value);
+        if (result)
+                result = save_settings_file (file_name, lines);
+
+        g_strfreev (lines);
+        return result;
+}
Index: b/common/gdm-sysconfig.h
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ b/common/gdm-sysconfig.h	2018-01-19 20:10:57.572967891 +0800
@@ -0,0 +1,43 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2008 Hans Petter Jansson <hpj@novell.com>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+
+#ifndef __GDM_SYSCONFIG_H
+#define __GDM_SYSCONFIG_H
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+gchar    **gdm_sysconfig_load_file (const gchar *file_name);
+gboolean   gdm_sysconfig_save_file (const gchar *file_name, const gchar **sysconfig);
+
+gchar     *gdm_sysconfig_get_value (const gchar **sysconfig, const gchar *key);
+gboolean   gdm_sysconfig_set_value (gchar **sysconfig, const gchar *key, const gchar *value);
+
+gboolean   gdm_sysconfig_get_value_boolean (const gchar **sysconfig, const gchar *key, gboolean *value);
+gboolean   gdm_sysconfig_set_value_boolean (gchar **sysconfig, const gchar *key, gboolean value);
+
+gchar     *gdm_sysconfig_load_value (const gchar *file_name, const gchar *key);
+gboolean   gdm_sysconfig_save_value (const gchar *file_name, const gchar *key, const gchar *value);
+
+G_END_DECLS
+
+#endif /* __GDM_SYSCONFIG_H */
Index: b/data/gdm.conf-custom.in
===================================================================
--- a/data/gdm.conf-custom.in	2018-01-19 20:09:39.075556951 +0800
+++ b/data/gdm.conf-custom.in	2018-01-19 20:10:57.572967891 +0800
@@ -1,4 +1,7 @@
 # GDM configuration storage
+#
+# Note: settings from /etc/sysconfig/displaymanager have a higher priority
+#
 
 [daemon]
 # Uncoment the line below to force the login screen to use Xorg

Places

File gdm-sysconfig-settings.patch of Package gdm (Revision 4e325da67c08327c769d4662bac8c436)

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