diff options
Diffstat (limited to 'libgdm/gdm-sessions.c')
| -rw-r--r-- | libgdm/gdm-sessions.c | 435 |
1 files changed, 435 insertions, 0 deletions
diff --git a/libgdm/gdm-sessions.c b/libgdm/gdm-sessions.c new file mode 100644 index 0000000..d8b4d5c --- /dev/null +++ b/libgdm/gdm-sessions.c @@ -0,0 +1,435 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- + * + * Copyright 2008 Red Hat, Inc, + * 2007 William Jon McCann <mccann@jhu.edu> + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Written by : William Jon McCann <mccann@jhu.edu> + * Ray Strode <rstrode@redhat.com> + */ + +#include "config.h" + +#include <stdlib.h> +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> +#include <dirent.h> +#include <sys/stat.h> + +#include <glib.h> +#include <glib/gi18n.h> +#include <glib/gstdio.h> + +#include "gdm-sessions.h" + +typedef struct _GdmSessionFile { + char *id; + char *path; + char *translated_name; + char *translated_comment; +} GdmSessionFile; + +static GHashTable *gdm_available_sessions_map; + +static gboolean gdm_sessions_map_is_initialized = FALSE; + +static void +gdm_session_file_free (GdmSessionFile *session) +{ + g_free (session->id); + g_free (session->path); + g_free (session->translated_name); + g_free (session->translated_comment); + g_free (session); +} + +/* adapted from gnome-menus desktop-entries.c */ +static gboolean +key_file_is_relevant (GKeyFile *key_file) +{ + GError *error; + gboolean no_display; + gboolean hidden; + gboolean tryexec_failed; + char *tryexec; + + error = NULL; + no_display = g_key_file_get_boolean (key_file, + G_KEY_FILE_DESKTOP_GROUP, + "NoDisplay", + &error); + if (error) { + no_display = FALSE; + g_error_free (error); + } + + error = NULL; + hidden = g_key_file_get_boolean (key_file, + G_KEY_FILE_DESKTOP_GROUP, + "Hidden", + &error); + if (error) { + hidden = FALSE; + g_error_free (error); + } + + tryexec_failed = FALSE; + tryexec = g_key_file_get_string (key_file, + G_KEY_FILE_DESKTOP_GROUP, + "TryExec", + NULL); + if (tryexec) { + char *path; + + path = g_find_program_in_path (g_strstrip (tryexec)); + + tryexec_failed = (path == NULL); + + g_free (path); + g_free (tryexec); + } + + if (no_display || hidden || tryexec_failed) { + return FALSE; + } + + return TRUE; +} + +static void +load_session_file (const char *id, + const char *path) +{ + GKeyFile *key_file; + GError *error; + gboolean res; + GdmSessionFile *session; + + key_file = g_key_file_new (); + + error = NULL; + res = g_key_file_load_from_file (key_file, path, 0, &error); + + if (!res) { + g_debug ("Failed to load \"%s\": %s\n", path, error->message); + g_error_free (error); + goto out; + } + + if (! g_key_file_has_group (key_file, G_KEY_FILE_DESKTOP_GROUP)) { + goto out; + } + + res = g_key_file_has_key (key_file, G_KEY_FILE_DESKTOP_GROUP, "Name", NULL); + if (! res) { + g_debug ("\"%s\" contains no \"Name\" key\n", path); + goto out; + } + + if (!key_file_is_relevant (key_file)) { + g_debug ("\"%s\" is hidden or contains non-executable TryExec program\n", path); + goto out; + } + + session = g_new0 (GdmSessionFile, 1); + + session->id = g_strdup (id); + session->path = g_strdup (path); + + session->translated_name = g_key_file_get_locale_string (key_file, G_KEY_FILE_DESKTOP_GROUP, "Name", NULL, NULL); + session->translated_comment = g_key_file_get_locale_string (key_file, G_KEY_FILE_DESKTOP_GROUP, "Comment", NULL, NULL); + + g_hash_table_insert (gdm_available_sessions_map, + g_strdup (id), + session); + out: + g_key_file_free (key_file); +} + +static gboolean +remove_duplicate_sessions (gpointer key, + gpointer value, + gpointer user_data) +{ + gboolean already_known; + GHashTable *names_seen_before; + GdmSessionFile *session; + + names_seen_before = (GHashTable *) user_data; + session = (GdmSessionFile *) value; + already_known = !g_hash_table_add (names_seen_before, session->translated_name); + + if (already_known) + g_debug ("GdmSession: Removing %s (%s) as we already have a session by this name", + session->id, + session->path); + + return already_known; +} + +static void +collect_sessions_from_directory (const char *dirname) +{ + GDir *dir; + const char *filename; + + gboolean is_x11 = g_getenv ("WAYLAND_DISPLAY") == NULL && + g_getenv ("RUNNING_UNDER_GDM") != NULL; + gboolean is_wayland = g_getenv ("WAYLAND_DISPLAY") != NULL && + g_getenv ("RUNNING_UNDER_GDM") != NULL; + + /* FIXME: add file monitor to directory */ + + dir = g_dir_open (dirname, 0, NULL); + if (dir == NULL) { + return; + } + + while ((filename = g_dir_read_name (dir))) { + char *id; + char *full_path; + + if (! g_str_has_suffix (filename, ".desktop")) { + continue; + } + + if (is_wayland) { + if (g_str_has_suffix (filename, "-wayland.desktop")) { + g_autofree char *base_name = g_strndup (filename, strlen (filename) - strlen ("-wayland.desktop")); + g_autofree char *other_name = g_strconcat (base_name, ".desktop", NULL); + g_autofree char *other_path = g_build_filename (dirname, other_name, NULL); + + if (g_file_test (other_path, G_FILE_TEST_EXISTS)) { + g_debug ("Running under Wayland, ignoring %s", filename); + continue; + } + } else { + g_autofree char *base_name = g_strndup (filename, strlen (filename) - strlen (".desktop")); + g_autofree char *other_name = g_strdup_printf ("%s-xorg.desktop", base_name); + g_autofree char *other_path = g_build_filename (dirname, other_name, NULL); + + if (g_file_test (other_path, G_FILE_TEST_EXISTS)) { + g_debug ("Running under Wayland, ignoring %s", filename); + continue; + } + } + } else if (is_x11) { + if (g_str_has_suffix (filename, "-xorg.desktop")) { + g_autofree char *base_name = g_strndup (filename, strlen (filename) - strlen ("-xorg.desktop")); + g_autofree char *other_name = g_strconcat (base_name, ".desktop", NULL); + g_autofree char *other_path = g_build_filename (dirname, other_name, NULL); + + if (g_file_test (other_path, G_FILE_TEST_EXISTS)) { + g_debug ("Running under X11, ignoring %s", filename); + continue; + } + } else { + g_autofree char *base_name = g_strndup (filename, strlen (filename) - strlen (".desktop")); + g_autofree char *other_name = g_strdup_printf ("%s-wayland.desktop", base_name); + g_autofree char *other_path = g_build_filename (dirname, other_name, NULL); + + if (g_file_test (other_path, G_FILE_TEST_EXISTS)) { + g_debug ("Running under X11, ignoring %s", filename); + continue; + } + } + } + + id = g_strndup (filename, strlen (filename) - strlen (".desktop")); + + full_path = g_build_filename (dirname, filename, NULL); + + load_session_file (id, full_path); + + g_free (id); + g_free (full_path); + } + + g_dir_close (dir); +} + +static void +collect_sessions (void) +{ + g_autoptr(GHashTable) names_seen_before = NULL; + g_autoptr(GPtrArray) xorg_search_array = NULL; + g_autoptr(GPtrArray) wayland_search_array = NULL; + gchar *session_dir = NULL; + int i; + const char *xorg_search_dirs[] = { + "/etc/X11/sessions/", + DMCONFDIR "/Sessions/", + DATADIR "/gdm/BuiltInSessions/", + DATADIR "/xsessions/", + }; + const gchar *supported_session_types_env = NULL; + g_auto (GStrv) supported_session_types = NULL; + + supported_session_types_env = g_getenv ("GDM_SUPPORTED_SESSION_TYPES"); + if (supported_session_types_env != NULL) { + supported_session_types = g_strsplit (supported_session_types_env, ":", -1); + } + + names_seen_before = g_hash_table_new (g_str_hash, g_str_equal); + xorg_search_array = g_ptr_array_new_with_free_func (g_free); + + const gchar * const *system_data_dirs = g_get_system_data_dirs (); + + for (i = 0; system_data_dirs[i]; i++) { + session_dir = g_build_filename (system_data_dirs[i], "xsessions", NULL); + g_ptr_array_add (xorg_search_array, session_dir); + } + + for (i = 0; i < G_N_ELEMENTS (xorg_search_dirs); i++) { + g_ptr_array_add (xorg_search_array, g_strdup (xorg_search_dirs[i])); + } + +#ifdef ENABLE_WAYLAND_SUPPORT + const char *wayland_search_dirs[] = { + DATADIR "/wayland-sessions/", + }; + + wayland_search_array = g_ptr_array_new_with_free_func (g_free); + + for (i = 0; system_data_dirs[i]; i++) { + session_dir = g_build_filename (system_data_dirs[i], "wayland-sessions", NULL); + g_ptr_array_add (wayland_search_array, session_dir); + } + + for (i = 0; i < G_N_ELEMENTS (wayland_search_dirs); i++) { + g_ptr_array_add (wayland_search_array, g_strdup (wayland_search_dirs[i])); + } +#endif + + if (gdm_available_sessions_map == NULL) { + gdm_available_sessions_map = g_hash_table_new_full (g_str_hash, g_str_equal, + g_free, (GDestroyNotify)gdm_session_file_free); + } + + if (!supported_session_types || g_strv_contains ((const char * const *) supported_session_types, "x11")) { + for (i = 0; i < xorg_search_array->len; i++) { + collect_sessions_from_directory (g_ptr_array_index (xorg_search_array, i)); + } + } + +#ifdef ENABLE_WAYLAND_SUPPORT +#ifdef ENABLE_USER_DISPLAY_SERVER + if (!supported_session_types || g_strv_contains ((const char * const *) supported_session_types, "wayland")) { + for (i = 0; i < wayland_search_array->len; i++) { + collect_sessions_from_directory (g_ptr_array_index (wayland_search_array, i)); + } + } +#endif +#endif + + g_hash_table_foreach_remove (gdm_available_sessions_map, + remove_duplicate_sessions, + names_seen_before); +} + +static gint +compare_session_ids (gconstpointer a, + gconstpointer b) +{ + GdmSessionFile *session_a, *session_b; + session_a = (GdmSessionFile *) g_hash_table_lookup (gdm_available_sessions_map, a); + session_b = (GdmSessionFile *) g_hash_table_lookup (gdm_available_sessions_map, b); + + if (session_a == NULL) + return -1; + + if (session_b == NULL) + return 1; + + return g_strcmp0 (session_a->translated_name, session_b->translated_name); +} + +/** + * gdm_get_session_ids: + * + * Reads /usr/share/xsessions and other relevant places for possible sessions + * to log into and returns the complete list. + * + * Returns: (transfer full): a %NULL terminated list of session ids + */ +char ** +gdm_get_session_ids (void) +{ + GHashTableIter iter; + gpointer key, value; + GPtrArray *array; + + if (!gdm_sessions_map_is_initialized) { + collect_sessions (); + + gdm_sessions_map_is_initialized = TRUE; + } + + array = g_ptr_array_new (); + g_hash_table_iter_init (&iter, gdm_available_sessions_map); + while (g_hash_table_iter_next (&iter, &key, &value)) { + GdmSessionFile *session; + + session = (GdmSessionFile *) value; + + g_ptr_array_add (array, g_strdup (session->id)); + } + g_ptr_array_add (array, NULL); + + g_ptr_array_sort (array, compare_session_ids); + + return (char **) g_ptr_array_free (array, FALSE); +} + +/** + * gdm_get_session_name_and_description: + * @id: an id from gdm_get_session_ids() + * @description: (out): optional returned session description + * + * Takes an xsession id and returns the name and comment about it. + * + * Returns: The session name if found, or %NULL otherwise + */ +char * +gdm_get_session_name_and_description (const char *id, + char **description) +{ + GdmSessionFile *session; + char *name; + + if (!gdm_sessions_map_is_initialized) { + collect_sessions (); + + gdm_sessions_map_is_initialized = TRUE; + } + + session = (GdmSessionFile *) g_hash_table_lookup (gdm_available_sessions_map, + id); + + if (session == NULL) { + return NULL; + } + + name = g_strdup (session->translated_name); + + if (description != NULL) { + *description = g_strdup (session->translated_comment); + } + + return name; +} |