Support Wayland sessions / greeters

Author: robert-ancell

data/lightdm.conf

@@ -28,7 +28,7 @@
 #log-directory=/var/log/lightdm
 #run-directory=/var/run/lightdm
 #cache-directory=/var/cache/lightdm
-#sessions-directory=/usr/share/lightdm/sessions:/usr/share/xsessions
+#sessions-directory=/usr/share/lightdm/sessions:/usr/share/xsessions:/usr/share/wayland-sessions
 #remote-sessions-directory=/usr/share/lightdm/remote-sessions
 #greeters-directory=/usr/share/lightdm/greeters:/usr/share/xgreeters
 

liblightdm-gobject/Makefile.am

@@ -8,7 +8,8 @@ liblightdm_gobject_1_la_CFLAGS = $(LIBLIGHTDM_GOBJECT_CFLAGS) \
 	$(WARN_CFLAGS) \
 	-I"$(top_srcdir)/common" \
 	-DCONFIG_DIR=\"$(sysconfdir)/lightdm\" \
-	-DSESSIONS_DIR=\"$(pkgdatadir)/sessions:$(datadir)/xsessions\" \
+	-DSESSIONS_DIR=\"$(pkgdatadir)/sessions:$(datadir)/xsessions:$(datadir)/wayland-sessions\" \
+	-DWAYLAND_SESSIONS_DIR=\"$(datadir)/wayland-sessions\" \    
 	-DREMOTE_SESSIONS_DIR=\"$(pkgdatadir)/remote-sessions\"
 
 mainheader_HEADERS = lightdm.h

liblightdm-gobject/session.c

@@ -46,9 +46,9 @@ compare_session (gconstpointer a, gconstpointer b)
 }
 
 static LightDMSession *
-load_session (GKeyFile *key_file, const gchar *key)
+load_session (GKeyFile *key_file, const gchar *key, const gchar *default_type)
 {
-    gchar *type, *domain, *name;
+    gchar *domain, *name, *type;
     LightDMSession *session;
     LightDMSessionPrivate *priv;
     gchar *try_exec;
@@ -57,10 +57,6 @@ load_session (GKeyFile *key_file, const gchar *key)
         g_key_file_get_boolean (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_HIDDEN, NULL))
         return NULL;
 
-    type = g_key_file_get_string (key_file, G_KEY_FILE_DESKTOP_GROUP, "X-LightDM-Session-Type", NULL);
-    if (!type)
-        type = "x";
-
 #ifdef G_KEY_FILE_DESKTOP_KEY_GETTEXT_DOMAIN
     domain = g_key_file_get_string (key_file, G_KEY_FILE_DESKTOP_GROUP, G_KEY_FILE_DESKTOP_KEY_GETTEXT_DOMAIN, NULL);
 #else
@@ -91,14 +87,18 @@ load_session (GKeyFile *key_file, const gchar *key)
         g_free (full_path);
     }
 
+    type = g_key_file_get_string (key_file, G_KEY_FILE_DESKTOP_GROUP, "X-LightDM-Session-Type", NULL);
+    if (!type)
+        type = strdup (default_type);
+
     session = g_object_new (LIGHTDM_TYPE_SESSION, NULL);
     priv = GET_PRIVATE (session);
 
     g_free (priv->key);
     priv->key = g_strdup (key);
 
     g_free (priv->type);
-    priv->type = g_strdup (type);
+    priv->type = type;
 
     g_free (priv->name);
     priv->name = name;
@@ -114,7 +114,7 @@ load_session (GKeyFile *key_file, const gchar *key)
 }
 
 static GList *
-load_sessions_dir (GList *sessions, const gchar *sessions_dir)
+load_sessions_dir (GList *sessions, const gchar *sessions_dir, const gchar *default_type)
 {
     GDir *directory;
     GError *error = NULL;
@@ -154,7 +154,7 @@ load_sessions_dir (GList *sessions, const gchar *sessions_dir)
             LightDMSession *session;
 
             key = g_strndup (filename, strlen (filename) - strlen (".desktop"));
-            session = load_session (key_file, key);
+            session = load_session (key_file, key, default_type);
             if (session)
             {
                 g_debug ("Loaded session %s (%s, %s)", path, GET_PRIVATE (session)->name, GET_PRIVATE (session)->comment);
@@ -182,8 +182,16 @@ load_sessions (const gchar *sessions_dir)
     int i;
 
     dirs = g_strsplit (sessions_dir, ":", -1);
-    for (i = 0; dirs[i]; i++)
-        sessions = load_sessions_dir (sessions, dirs[i]);
+    for (i = 0; dirs[i]; i++) 
+    {
+        const gchar *default_type = "x";
+
+        if (strcmp (dirs[i], WAYLAND_SESSIONS_DIR) == 0)
+            default_type = "wayland";
+
+        sessions = load_sessions_dir (sessions, dirs[i], default_type);
+    }
+ 
     g_strfreev (dirs);
 
     return sessions;

liblightdm-qt/Makefile.am

@@ -12,8 +12,7 @@ common_cflags = \
 	$(WARN_CXXFLAGS) \
 	-I$(top_srcdir)/liblightdm-gobject \
 	$(GLIB_CFLAGS) \
-	-DQT_NO_KEYWORDS \
-	-DXSESSIONS_DIR=\"$(datadir)/xsessions\"
+	-DQT_NO_KEYWORDS
 liblightdm_qt_3_la_CXXFLAGS = \
 	$(LIBLIGHTDM_QT4_CFLAGS) \
 	$(common_cflags)

src/Makefile.am

@@ -51,6 +51,8 @@ lightdm_SOURCES = \
 	vnc-server.h \
 	vt.c \
 	vt.h \
+	wayland-session.c \
+	wayland-session.h \
 	x-authority.c \
 	x-authority.h \
 	x-server-local.c \
@@ -78,7 +80,8 @@ lightdm_CFLAGS = \
 	-DLOG_DIR=\"$(localstatedir)/log/lightdm\" \
 	-DRUN_DIR=\"$(localstatedir)/run/lightdm\" \
 	-DCACHE_DIR=\"$(localstatedir)/cache/lightdm\" \
-	-DSESSIONS_DIR=\"$(pkgdatadir)/sessions:$(datadir)/xsessions\" \
+	-DSESSIONS_DIR=\"$(pkgdatadir)/sessions:$(datadir)/xsessions:$(datadir)/wayland-sessions\" \
+	-DWAYLAND_SESSIONS_DIR=\"$(datadir)/wayland-sessions\" \    
 	-DREMOTE_SESSIONS_DIR=\"$(pkgdatadir)/remote-sessions\" \
 	-DGREETERS_DIR=\"$(pkgdatadir)/greeters:$(datadir)/xgreeters\"
 

src/seat-xlocal.c

@@ -15,6 +15,7 @@
 #include "configuration.h"
 #include "x-server-local.h"
 #include "unity-system-compositor.h"
+#include "wayland-session.h"
 #include "plymouth.h"
 #include "vt.h"
 
@@ -247,6 +248,21 @@ create_unity_system_compositor (Seat *seat)
     return DISPLAY_SERVER (compositor);
 }
 
+static DisplayServer *
+create_wayland_session (Seat *seat)
+{
+    WaylandSession *session;
+    gint vt;
+
+    session = wayland_session_new ();
+
+    vt = get_vt (seat, DISPLAY_SERVER (session));
+    if (vt >= 0)
+        wayland_session_set_vt (session, vt);
+
+    return DISPLAY_SERVER (session);
+}
+
 static DisplayServer *
 seat_xlocal_create_display_server (Seat *seat, Session *session)
 {
@@ -257,6 +273,8 @@ seat_xlocal_create_display_server (Seat *seat, Session *session)
         return DISPLAY_SERVER (create_x_server (seat));
     else if (strcmp (session_type, "mir") == 0)
         return create_unity_system_compositor (seat);
+    else if (strcmp (session_type, "wayland") == 0)
+        return create_wayland_session (seat);
     else if (strcmp (session_type, "mir-container") == 0)
     {
         DisplayServer *compositor;

src/seat.c

@@ -962,11 +962,15 @@ find_session_config (Seat *seat, const gchar *sessions_dir, const gchar *session
     for (i = 0; dirs[i]; i++)
     {
         gchar *filename, *path;
+        const gchar *default_session_type = "x";
+
+        if (strcmp (dirs[i], WAYLAND_SESSIONS_DIR) == 0)
+            default_session_type = "wayland";
 
         filename = g_strdup_printf ("%s.desktop", session_name);
         path = g_build_filename (dirs[i], filename, NULL);
         g_free (filename);
-        session_config = session_config_new_from_file (path, &error);
+        session_config = session_config_new_from_file (path, default_session_type, &error);
         g_free (path);
         if (session_config)
             break;

src/session-config.c

@@ -29,7 +29,7 @@ struct SessionConfigPrivate
 G_DEFINE_TYPE (SessionConfig, session_config, G_TYPE_OBJECT);
 
 SessionConfig *
-session_config_new_from_file (const gchar *filename, GError **error)
+session_config_new_from_file (const gchar *filename, const gchar *default_session_type, GError **error)
 {
     GKeyFile *desktop_file;
     SessionConfig *config;
@@ -52,7 +52,7 @@ session_config_new_from_file (const gchar *filename, GError **error)
     config->priv->command = command;
     config->priv->session_type = g_key_file_get_string (desktop_file, G_KEY_FILE_DESKTOP_GROUP, "X-LightDM-Session-Type", NULL);
     if (!config->priv->session_type)
-        config->priv->session_type = g_strdup ("x");
+        config->priv->session_type = g_strdup (default_session_type);
 
     config->priv->desktop_names = g_key_file_get_string_list (desktop_file, G_KEY_FILE_DESKTOP_GROUP, "DesktopNames", NULL, NULL);
     if (!config->priv->desktop_names)

src/session-config.h

@@ -36,7 +36,7 @@ typedef struct
 
 GType session_config_get_type (void);
 
-SessionConfig *session_config_new_from_file (const gchar *filename, GError **error);
+SessionConfig *session_config_new_from_file (const gchar *filename, const gchar *default_session_type, GError **error);
 
 const gchar *session_config_get_command (SessionConfig *config);
 

src/wayland-session.c

@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2015 Canonical Ltd.
+ * Author: Robert Ancell <[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 3 of the License, or (at your option) any later
+ * version. See http://www.gnu.org/copyleft/gpl.html the full text of the
+ * license.
+ */
+
+#include "wayland-session.h"
+#include "vt.h"
+
+struct WaylandSessionPrivate
+{
+    /* VT to run on */
+    gint vt;
+    gboolean have_vt_ref;
+};
+
+G_DEFINE_TYPE (WaylandSession, wayland_session, DISPLAY_SERVER_TYPE);
+
+WaylandSession *
+wayland_session_new (void)
+{
+    return g_object_new (WAYLAND_SESSION_TYPE, NULL);
+}
+
+void
+wayland_session_set_vt (WaylandSession *session, gint vt)
+{
+    g_return_if_fail (session != NULL);
+
+    if (session->priv->have_vt_ref)
+        vt_unref (session->priv->vt);
+    session->priv->have_vt_ref = FALSE;
+    session->priv->vt = vt;
+    if (vt > 0)
+    {
+        vt_ref (vt);
+        session->priv->have_vt_ref = TRUE;
+    }
+}
+
+static gint
+wayland_session_get_vt (DisplayServer *server)
+{
+    g_return_val_if_fail (server != NULL, 0);
+    return WAYLAND_SESSION (server)->priv->vt;
+}
+
+static void
+wayland_session_connect_session (DisplayServer *display_server, Session *session)
+{
+    WaylandSession *wayland_session = WAYLAND_SESSION (display_server);
+
+    session_set_env (session, "XDG_SESSION_TYPE", "wayland");
+
+    if (wayland_session->priv->vt >= 0)
+    {
+        gchar *value = g_strdup_printf ("%d", wayland_session->priv->vt);
+        session_set_env (session, "XDG_VTNR", value);
+        g_free (value);
+    }
+}
+
+static void
+wayland_session_disconnect_session (DisplayServer *display_server, Session *session)
+{
+    session_unset_env (session, "XDG_SESSION_TYPE");
+    session_unset_env (session, "XDG_VTNR");
+}
+
+static void
+wayland_session_init (WaylandSession *session)
+{
+    session->priv = G_TYPE_INSTANCE_GET_PRIVATE (session, WAYLAND_SESSION_TYPE, WaylandSessionPrivate);
+}
+
+static void
+wayland_session_finalize (GObject *object)
+{
+    WaylandSession *self;
+
+    self = WAYLAND_SESSION (object);
+
+    if (self->priv->have_vt_ref)
+        vt_unref (self->priv->vt);
+
+    G_OBJECT_CLASS (wayland_session_parent_class)->finalize (object);
+}
+
+static void
+wayland_session_class_init (WaylandSessionClass *klass)
+{
+    GObjectClass *object_class = G_OBJECT_CLASS (klass);
+    DisplayServerClass *display_server_class = DISPLAY_SERVER_CLASS (klass);
+
+    display_server_class->get_vt = wayland_session_get_vt;
+    display_server_class->connect_session = wayland_session_connect_session;
+    display_server_class->disconnect_session = wayland_session_disconnect_session;
+    object_class->finalize = wayland_session_finalize;
+
+    g_type_class_add_private (klass, sizeof (WaylandSessionPrivate));
+}

src/wayland-session.h

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2015 Canonical Ltd.
+ * Author: Robert Ancell <[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 3 of the License, or (at your option) any later
+ * version. See http://www.gnu.org/copyleft/gpl.html the full text of the
+ * license.
+ */
+
+#ifndef WAYLAND_SESSION_H_
+#define WAYLAND_SESSION_H_
+
+#include <glib-object.h>
+#include "display-server.h"
+
+G_BEGIN_DECLS
+
+#define WAYLAND_SESSION_TYPE    (wayland_session_get_type())
+#define WAYLAND_SESSION(obj)    (G_TYPE_CHECK_INSTANCE_CAST ((obj), WAYLAND_SESSION_TYPE, WaylandSession))
+#define IS_WAYLAND_SESSION(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), WAYLAND_SESSION_TYPE))
+
+typedef struct WaylandSessionPrivate WaylandSessionPrivate;
+
+typedef struct
+{
+    DisplayServer          parent_instance;
+    WaylandSessionPrivate *priv;
+} WaylandSession;
+
+typedef struct
+{
+    DisplayServerClass parent_class;
+} WaylandSessionClass;
+
+GType wayland_session_get_type (void);
+
+WaylandSession *wayland_session_new (void);
+
+void wayland_session_set_vt (WaylandSession *session, gint vt);
+
+G_END_DECLS
+
+#endif /* WAYLAND_SESSION_H_ */

tests/Makefile.am

@@ -198,6 +198,9 @@ TESTS = \
 	test-mir-session-crash \
 	test-mir-session-compositor-crash \
 	test-mir-container-session \
+	test-wayland-autologin \
+	test-wayland-greeter \
+	test-wayland-session \
 	test-unity-compositor-command \
 	test-unity-compositor-not-found \
 	test-unity-compositor-fail-start \
@@ -348,12 +351,14 @@ EXTRA_DIST = \
 	data/greeters/test-python-greeter.desktop \
 	data/greeters/test-qt4-greeter.desktop \
 	data/greeters/test-qt5-greeter.desktop \
+	data/greeters/test-wayland-greeter.desktop \
 	data/sessions/alternative.desktop \
 	data/sessions/default.desktop \
 	data/sessions/mir.desktop \
 	data/sessions/mir-container.desktop \
 	data/sessions/named.desktop \
 	data/sessions/named-legacy.desktop \
+	data/sessions/wayland.desktop \
 	scripts/0-additional.conf \
 	scripts/1-additional.conf \
 	scripts/additional-config.conf \
@@ -565,6 +570,9 @@ EXTRA_DIST = \
 	scripts/vnc-guest.conf \
 	scripts/vnc-login.conf \
 	scripts/vnc-open-file-descriptors.conf \
+	scripts/wayland-autologin.conf \
+	scripts/wayland-greeter.conf \
+	scripts/wayland-session.conf \
 	scripts/xauthority.conf \
 	scripts/xdg-current-desktop.conf \
 	scripts/xdg-current-desktop-legacy.conf \