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glib/gio/gkeyfilesettingsbackend.c
Michael Catanzaro 26f6e3db9e gkeyfilesettingsbackend: check for errors when creating file monitors 
File monitor creation may fail. We should check for this, rather than
ignoring it and then spewing criticals upon improperly assuming that we
have a valid GFileMonitor rather than NULL.

In practice, creating the GFileMonitors here fail when opening a large
number of tabs in Epiphany. I'm still investigating to see why, but it
doesn't matter for the purposes of this commit.
2021-02-23 16:31:26 -06:00

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/*
* Copyright © 2010 Codethink Limited
* Copyright © 2010 Novell, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Authors: Vincent Untz <vuntz@gnome.org>
* Ryan Lortie <desrt@desrt.ca>
*/
#include "config.h"
#include <glib.h>
#include <glibintl.h>
#include <stdio.h>
#include <string.h>
#include "gfile.h"
#include "gfileinfo.h"
#include "gfileenumerator.h"
#include "gfilemonitor.h"
#include "gsimplepermission.h"
#include "gsettingsbackendinternal.h"
#include "giomodule-priv.h"
#include "gportalsupport.h"
#define G_TYPE_KEYFILE_SETTINGS_BACKEND (g_keyfile_settings_backend_get_type ())
#define G_KEYFILE_SETTINGS_BACKEND(inst) (G_TYPE_CHECK_INSTANCE_CAST ((inst), \
G_TYPE_KEYFILE_SETTINGS_BACKEND, \
GKeyfileSettingsBackend))
#define G_IS_KEYFILE_SETTINGS_BACKEND(inst) (G_TYPE_CHECK_INSTANCE_TYPE ((inst), \
G_TYPE_KEYFILE_SETTINGS_BACKEND))
typedef GSettingsBackendClass GKeyfileSettingsBackendClass;
typedef enum {
PROP_FILENAME = 1,
PROP_ROOT_PATH,
PROP_ROOT_GROUP,
PROP_DEFAULTS_DIR
} GKeyfileSettingsBackendProperty;
typedef struct
{
GSettingsBackend parent_instance;
GKeyFile *keyfile;
GPermission *permission;
gboolean writable;
char *defaults_dir;
GKeyFile *system_keyfile;
GHashTable *system_locks; /* Used as a set, owning the strings it contains */
gchar *prefix;
gint prefix_len;
gchar *root_group;
gint root_group_len;
GFile *file;
GFileMonitor *file_monitor;
guint8 digest[32];
GFile *dir;
GFileMonitor *dir_monitor;
} GKeyfileSettingsBackend;
#ifdef G_OS_WIN32
#define EXTENSION_PRIORITY 10
#else
#define EXTENSION_PRIORITY (glib_should_use_portal () && !glib_has_dconf_access_in_sandbox () ? 110 : 10)
#endif
G_DEFINE_TYPE_WITH_CODE (GKeyfileSettingsBackend,
g_keyfile_settings_backend,
G_TYPE_SETTINGS_BACKEND,
_g_io_modules_ensure_extension_points_registered ();
g_io_extension_point_implement (G_SETTINGS_BACKEND_EXTENSION_POINT_NAME,
g_define_type_id, "keyfile", EXTENSION_PRIORITY))
static void
compute_checksum (guint8 *digest,
gconstpointer contents,
gsize length)
{
GChecksum *checksum;
gsize len = 32;
checksum = g_checksum_new (G_CHECKSUM_SHA256);
g_checksum_update (checksum, contents, length);
g_checksum_get_digest (checksum, digest, &len);
g_checksum_free (checksum);
g_assert (len == 32);
}
static gboolean
g_keyfile_settings_backend_keyfile_write (GKeyfileSettingsBackend *kfsb,
GError **error)
{
gchar *contents;
gsize length;
gboolean success;
contents = g_key_file_to_data (kfsb->keyfile, &length, NULL);
success = g_file_replace_contents (kfsb->file, contents, length, NULL, FALSE,
G_FILE_CREATE_REPLACE_DESTINATION |
G_FILE_CREATE_PRIVATE,
NULL, NULL, error);
compute_checksum (kfsb->digest, contents, length);
g_free (contents);
return success;
}
static gboolean
group_name_matches (const gchar *group_name,
const gchar *prefix)
{
/* sort of like g_str_has_prefix() except that it must be an exact
* match or the prefix followed by '/'.
*
* for example 'a' is a prefix of 'a' and 'a/b' but not 'ab'.
*/
gint i;
for (i = 0; prefix[i]; i++)
if (prefix[i] != group_name[i])
return FALSE;
return group_name[i] == '\0' || group_name[i] == '/';
}
static gboolean
convert_path (GKeyfileSettingsBackend *kfsb,
const gchar *key,
gchar **group,
gchar **basename)
{
gsize key_len = strlen (key);
const gchar *last_slash;
if (key_len < kfsb->prefix_len ||
memcmp (key, kfsb->prefix, kfsb->prefix_len) != 0)
return FALSE;
key_len -= kfsb->prefix_len;
key += kfsb->prefix_len;
last_slash = strrchr (key, '/');
/* Disallow empty group names or key names */
if (key_len == 0 ||
(last_slash != NULL &&
(*(last_slash + 1) == '\0' ||
last_slash == key)))
return FALSE;
if (kfsb->root_group)
{
/* if a root_group was specified, make sure the user hasn't given
* a path that ghosts that group name
*/
if (last_slash != NULL && (last_slash - key) == kfsb->root_group_len && memcmp (key, kfsb->root_group, last_slash - key) == 0)
return FALSE;
}
else
{
/* if no root_group was given, ensure that the user gave a path */
if (last_slash == NULL)
return FALSE;
}
if (group)
{
if (last_slash != NULL)
{
*group = g_memdup2 (key, (last_slash - key) + 1);
(*group)[(last_slash - key)] = '\0';
}
else
*group = g_strdup (kfsb->root_group);
}
if (basename)
{
if (last_slash != NULL)
*basename = g_memdup2 (last_slash + 1, key_len - (last_slash - key));
else
*basename = g_strdup (key);
}
return TRUE;
}
static gboolean
path_is_valid (GKeyfileSettingsBackend *kfsb,
const gchar *path)
{
return convert_path (kfsb, path, NULL, NULL);
}
static GVariant *
get_from_keyfile (GKeyfileSettingsBackend *kfsb,
const GVariantType *type,
const gchar *key)
{
GVariant *return_value = NULL;
gchar *group, *name;
if (convert_path (kfsb, key, &group, &name))
{
gchar *str;
gchar *sysstr;
g_assert (*name);
sysstr = g_key_file_get_value (kfsb->system_keyfile, group, name, NULL);
str = g_key_file_get_value (kfsb->keyfile, group, name, NULL);
if (sysstr &&
(g_hash_table_contains (kfsb->system_locks, key) ||
str == NULL))
{
g_free (str);
str = g_steal_pointer (&sysstr);
}
if (str)
{
return_value = g_variant_parse (type, str, NULL, NULL, NULL);
/* As a special case, support values of type %G_VARIANT_TYPE_STRING
* not being quoted, since users keep forgetting to do it and then
* getting confused. */
if (return_value == NULL &&
g_variant_type_equal (type, G_VARIANT_TYPE_STRING) &&
str[0] != '\"')
{
GString *s = g_string_sized_new (strlen (str) + 2);
char *p = str;
g_string_append_c (s, '\"');
while (*p)
{
if (*p == '\"')
g_string_append_c (s, '\\');
g_string_append_c (s, *p);
p++;
}
g_string_append_c (s, '\"');
return_value = g_variant_parse (type, s->str, NULL, NULL, NULL);
g_string_free (s, TRUE);
}
g_free (str);
}
g_free (sysstr);
g_free (group);
g_free (name);
}
return return_value;
}
static gboolean
set_to_keyfile (GKeyfileSettingsBackend *kfsb,
const gchar *key,
GVariant *value)
{
gchar *group, *name;
if (g_hash_table_contains (kfsb->system_locks, key))
return FALSE;
if (convert_path (kfsb, key, &group, &name))
{
if (value)
{
gchar *str = g_variant_print (value, FALSE);
g_key_file_set_value (kfsb->keyfile, group, name, str);
g_variant_unref (g_variant_ref_sink (value));
g_free (str);
}
else
{
if (*name == '\0')
{
gchar **groups;
gint i;
groups = g_key_file_get_groups (kfsb->keyfile, NULL);
for (i = 0; groups[i]; i++)
if (group_name_matches (groups[i], group))
g_key_file_remove_group (kfsb->keyfile, groups[i], NULL);
g_strfreev (groups);
}
else
g_key_file_remove_key (kfsb->keyfile, group, name, NULL);
}
g_free (group);
g_free (name);
return TRUE;
}
return FALSE;
}
static GVariant *
g_keyfile_settings_backend_read (GSettingsBackend *backend,
const gchar *key,
const GVariantType *expected_type,
gboolean default_value)
{
GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (backend);
if (default_value)
return NULL;
return get_from_keyfile (kfsb, expected_type, key);
}
typedef struct
{
GKeyfileSettingsBackend *kfsb;
gboolean failed;
} WriteManyData;
static gboolean
g_keyfile_settings_backend_write_one (gpointer key,
gpointer value,
gpointer user_data)
{
WriteManyData *data = user_data;
gboolean success G_GNUC_UNUSED /* when compiling with G_DISABLE_ASSERT */;
success = set_to_keyfile (data->kfsb, key, value);
g_assert (success);
return FALSE;
}
static gboolean
g_keyfile_settings_backend_check_one (gpointer key,
gpointer value,
gpointer user_data)
{
WriteManyData *data = user_data;
return data->failed = g_hash_table_contains (data->kfsb->system_locks, key) ||
!path_is_valid (data->kfsb, key);
}
static gboolean
g_keyfile_settings_backend_write_tree (GSettingsBackend *backend,
GTree *tree,
gpointer origin_tag)
{
WriteManyData data = { G_KEYFILE_SETTINGS_BACKEND (backend), 0 };
gboolean success;
GError *error = NULL;
if (!data.kfsb->writable)
return FALSE;
g_tree_foreach (tree, g_keyfile_settings_backend_check_one, &data);
if (data.failed)
return FALSE;
g_tree_foreach (tree, g_keyfile_settings_backend_write_one, &data);
success = g_keyfile_settings_backend_keyfile_write (data.kfsb, &error);
if (error)
{
g_warning ("Failed to write keyfile to %s: %s", g_file_peek_path (data.kfsb->file), error->message);
g_error_free (error);
}
g_settings_backend_changed_tree (backend, tree, origin_tag);
return success;
}
static gboolean
g_keyfile_settings_backend_write (GSettingsBackend *backend,
const gchar *key,
GVariant *value,
gpointer origin_tag)
{
GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (backend);
gboolean success;
GError *error = NULL;
if (!kfsb->writable)
return FALSE;
success = set_to_keyfile (kfsb, key, value);
if (success)
{
g_settings_backend_changed (backend, key, origin_tag);
success = g_keyfile_settings_backend_keyfile_write (kfsb, &error);
if (error)
{
g_warning ("Failed to write keyfile to %s: %s", g_file_peek_path (kfsb->file), error->message);
g_error_free (error);
}
}
return success;
}
static void
g_keyfile_settings_backend_reset (GSettingsBackend *backend,
const gchar *key,
gpointer origin_tag)
{
GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (backend);
GError *error = NULL;
if (set_to_keyfile (kfsb, key, NULL))
{
g_keyfile_settings_backend_keyfile_write (kfsb, &error);
if (error)
{
g_warning ("Failed to write keyfile to %s: %s", g_file_peek_path (kfsb->file), error->message);
g_error_free (error);
}
}
g_settings_backend_changed (backend, key, origin_tag);
}
static gboolean
g_keyfile_settings_backend_get_writable (GSettingsBackend *backend,
const gchar *name)
{
GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (backend);
return kfsb->writable &&
!g_hash_table_contains (kfsb->system_locks, name) &&
path_is_valid (kfsb, name);
}
static GPermission *
g_keyfile_settings_backend_get_permission (GSettingsBackend *backend,
const gchar *path)
{
GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (backend);
return g_object_ref (kfsb->permission);
}
static void
keyfile_to_tree (GKeyfileSettingsBackend *kfsb,
GTree *tree,
GKeyFile *keyfile,
gboolean dup_check)
{
gchar **groups;
gint i;
groups = g_key_file_get_groups (keyfile, NULL);
for (i = 0; groups[i]; i++)
{
gboolean is_root_group;
gchar **keys;
gint j;
is_root_group = g_strcmp0 (kfsb->root_group, groups[i]) == 0;
/* reject group names that will form invalid key names */
if (!is_root_group &&
(g_str_has_prefix (groups[i], "/") ||
g_str_has_suffix (groups[i], "/") || strstr (groups[i], "//")))
continue;
keys = g_key_file_get_keys (keyfile, groups[i], NULL, NULL);
g_assert (keys != NULL);
for (j = 0; keys[j]; j++)
{
gchar *path, *value;
/* reject key names with slashes in them */
if (strchr (keys[j], '/'))
continue;
if (is_root_group)
path = g_strdup_printf ("%s%s", kfsb->prefix, keys[j]);
else
path = g_strdup_printf ("%s%s/%s", kfsb->prefix, groups[i], keys[j]);
value = g_key_file_get_value (keyfile, groups[i], keys[j], NULL);
if (dup_check && g_strcmp0 (g_tree_lookup (tree, path), value) == 0)
{
g_tree_remove (tree, path);
g_free (value);
g_free (path);
}
else
g_tree_insert (tree, path, value);
}
g_strfreev (keys);
}
g_strfreev (groups);
}
static void
g_keyfile_settings_backend_keyfile_reload (GKeyfileSettingsBackend *kfsb)
{
guint8 digest[32];
gchar *contents;
gsize length;
contents = NULL;
length = 0;
g_file_load_contents (kfsb->file, NULL, &contents, &length, NULL, NULL);
compute_checksum (digest, contents, length);
if (memcmp (kfsb->digest, digest, sizeof digest) != 0)
{
GKeyFile *keyfiles[2];
GTree *tree;
tree = g_tree_new_full ((GCompareDataFunc) strcmp, NULL,
g_free, g_free);
keyfiles[0] = kfsb->keyfile;
keyfiles[1] = g_key_file_new ();
if (length > 0)
g_key_file_load_from_data (keyfiles[1], contents, length,
G_KEY_FILE_KEEP_COMMENTS |
G_KEY_FILE_KEEP_TRANSLATIONS, NULL);
keyfile_to_tree (kfsb, tree, keyfiles[0], FALSE);
keyfile_to_tree (kfsb, tree, keyfiles[1], TRUE);
g_key_file_free (keyfiles[0]);
kfsb->keyfile = keyfiles[1];
if (g_tree_nnodes (tree) > 0)
g_settings_backend_changed_tree (&kfsb->parent_instance, tree, NULL);
g_tree_unref (tree);
memcpy (kfsb->digest, digest, sizeof digest);
}
g_free (contents);
}
static void
g_keyfile_settings_backend_keyfile_writable (GKeyfileSettingsBackend *kfsb)
{
GFileInfo *fileinfo;
gboolean writable;
fileinfo = g_file_query_info (kfsb->dir, "access::*", 0, NULL, NULL);
if (fileinfo)
{
writable =
g_file_info_get_attribute_boolean (fileinfo, G_FILE_ATTRIBUTE_ACCESS_CAN_WRITE) &&
g_file_info_get_attribute_boolean (fileinfo, G_FILE_ATTRIBUTE_ACCESS_CAN_EXECUTE);
g_object_unref (fileinfo);
}
else
writable = FALSE;
if (writable != kfsb->writable)
{
kfsb->writable = writable;
g_settings_backend_path_writable_changed (&kfsb->parent_instance, "/");
}
}
static void
g_keyfile_settings_backend_finalize (GObject *object)
{
GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (object);
g_key_file_free (kfsb->keyfile);
g_object_unref (kfsb->permission);
g_key_file_unref (kfsb->system_keyfile);
g_hash_table_unref (kfsb->system_locks);
g_free (kfsb->defaults_dir);
if (kfsb->file_monitor)
{
g_file_monitor_cancel (kfsb->file_monitor);
g_object_unref (kfsb->file_monitor);
}
g_object_unref (kfsb->file);
if (kfsb->dir_monitor)
{
g_file_monitor_cancel (kfsb->dir_monitor);
g_object_unref (kfsb->dir_monitor);
}
g_object_unref (kfsb->dir);
g_free (kfsb->root_group);
g_free (kfsb->prefix);
G_OBJECT_CLASS (g_keyfile_settings_backend_parent_class)->finalize (object);
}
static void
g_keyfile_settings_backend_init (GKeyfileSettingsBackend *kfsb)
{
}
static void
file_changed (GFileMonitor *monitor,
GFile *file,
GFile *other_file,
GFileMonitorEvent event_type,
gpointer user_data)
{
GKeyfileSettingsBackend *kfsb = user_data;
/* Ignore file deletions, let the GKeyFile content remain in tact. */
if (event_type != G_FILE_MONITOR_EVENT_DELETED)
g_keyfile_settings_backend_keyfile_reload (kfsb);
}
static void
dir_changed (GFileMonitor *monitor,
GFile *file,
GFile *other_file,
GFileMonitorEvent event_type,
gpointer user_data)
{
GKeyfileSettingsBackend *kfsb = user_data;
g_keyfile_settings_backend_keyfile_writable (kfsb);
}
static void
load_system_settings (GKeyfileSettingsBackend *kfsb)
{
GError *error = NULL;
const char *dir = "/etc/glib-2.0/settings";
char *path;
char *contents;
kfsb->system_keyfile = g_key_file_new ();
kfsb->system_locks = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
if (kfsb->defaults_dir)
dir = kfsb->defaults_dir;
path = g_build_filename (dir, "defaults", NULL);
/* The defaults are in the same keyfile format that we use for the settings.
* It can be produced from a dconf database using: dconf dump
*/
if (!g_key_file_load_from_file (kfsb->system_keyfile, path, G_KEY_FILE_NONE, &error))
{
if (!g_error_matches (error, G_FILE_ERROR, G_FILE_ERROR_NOENT))
g_warning ("Failed to read %s: %s", path, error->message);
g_clear_error (&error);
}
else
g_debug ("Loading default settings from %s", path);
g_free (path);
path = g_build_filename (dir, "locks", NULL);
/* The locks file is a text file containing a list paths to lock, one per line.
* It can be produced from a dconf database using: dconf list-locks
*/
if (!g_file_get_contents (path, &contents, NULL, &error))
{
if (!g_error_matches (error, G_FILE_ERROR, G_FILE_ERROR_NOENT))
g_warning ("Failed to read %s: %s", path, error->message);
g_clear_error (&error);
}
else
{
char **lines;
gsize i;
g_debug ("Loading locks from %s", path);
lines = g_strsplit (contents, "\n", 0);
for (i = 0; lines[i]; i++)
{
char *line = lines[i];
if (line[0] == '#' || line[0] == '\0')
{
g_free (line);
continue;
}
g_debug ("Locking key %s", line);
g_hash_table_add (kfsb->system_locks, g_steal_pointer (&line));
}
g_free (lines);
}
g_free (contents);
g_free (path);
}
static void
g_keyfile_settings_backend_constructed (GObject *object)
{
GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (object);
GError *error = NULL;
const char *path;
if (kfsb->file == NULL)
{
char *filename = g_build_filename (g_get_user_config_dir (),
"glib-2.0", "settings", "keyfile",
NULL);
kfsb->file = g_file_new_for_path (filename);
g_free (filename);
}
if (kfsb->prefix == NULL)
{
kfsb->prefix = g_strdup ("/");
kfsb->prefix_len = 1;
}
kfsb->keyfile = g_key_file_new ();
kfsb->permission = g_simple_permission_new (TRUE);
kfsb->dir = g_file_get_parent (kfsb->file);
path = g_file_peek_path (kfsb->dir);
if (g_mkdir_with_parents (path, 0700) == -1)
g_warning ("Failed to create %s: %s", path, g_strerror (errno));
kfsb->file_monitor = g_file_monitor (kfsb->file, G_FILE_MONITOR_NONE, NULL, &error);
if (!kfsb->file_monitor)
{
g_warning ("Failed to create file monitor for %s: %s", g_file_peek_path (kfsb->file), error->message);
g_clear_error (&error);
}
else
{
g_signal_connect (kfsb->file_monitor, "changed",
G_CALLBACK (file_changed), kfsb);
}
kfsb->dir_monitor = g_file_monitor (kfsb->dir, G_FILE_MONITOR_NONE, NULL, &error);
if (!kfsb->dir_monitor)
{
g_warning ("Failed to create file monitor for %s: %s", g_file_peek_path (kfsb->file), error->message);
g_clear_error (&error);
}
else
{
g_signal_connect (kfsb->dir_monitor, "changed",
G_CALLBACK (dir_changed), kfsb);
}
compute_checksum (kfsb->digest, NULL, 0);
g_keyfile_settings_backend_keyfile_writable (kfsb);
g_keyfile_settings_backend_keyfile_reload (kfsb);
load_system_settings (kfsb);
}
static void
g_keyfile_settings_backend_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (object);
switch ((GKeyfileSettingsBackendProperty)prop_id)
{
case PROP_FILENAME:
/* Construct only. */
g_assert (kfsb->file == NULL);
if (g_value_get_string (value))
kfsb->file = g_file_new_for_path (g_value_get_string (value));
break;
case PROP_ROOT_PATH:
/* Construct only. */
g_assert (kfsb->prefix == NULL);
kfsb->prefix = g_value_dup_string (value);
if (kfsb->prefix)
kfsb->prefix_len = strlen (kfsb->prefix);
break;
case PROP_ROOT_GROUP:
/* Construct only. */
g_assert (kfsb->root_group == NULL);
kfsb->root_group = g_value_dup_string (value);
if (kfsb->root_group)
kfsb->root_group_len = strlen (kfsb->root_group);
break;
case PROP_DEFAULTS_DIR:
/* Construct only. */
g_assert (kfsb->defaults_dir == NULL);
kfsb->defaults_dir = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_keyfile_settings_backend_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (object);
switch ((GKeyfileSettingsBackendProperty)prop_id)
{
case PROP_FILENAME:
g_value_set_string (value, g_file_peek_path (kfsb->file));
break;
case PROP_ROOT_PATH:
g_value_set_string (value, kfsb->prefix);
break;
case PROP_ROOT_GROUP:
g_value_set_string (value, kfsb->root_group);
break;
case PROP_DEFAULTS_DIR:
g_value_set_string (value, kfsb->defaults_dir);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_keyfile_settings_backend_class_init (GKeyfileSettingsBackendClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
object_class->finalize = g_keyfile_settings_backend_finalize;
object_class->constructed = g_keyfile_settings_backend_constructed;
object_class->get_property = g_keyfile_settings_backend_get_property;
object_class->set_property = g_keyfile_settings_backend_set_property;
class->read = g_keyfile_settings_backend_read;
class->write = g_keyfile_settings_backend_write;
class->write_tree = g_keyfile_settings_backend_write_tree;
class->reset = g_keyfile_settings_backend_reset;
class->get_writable = g_keyfile_settings_backend_get_writable;
class->get_permission = g_keyfile_settings_backend_get_permission;
/* No need to implement subscribed/unsubscribe: the only point would be to
* stop monitoring the file when there's no GSettings anymore, which is no
* big win.
*/
/**
* GKeyfileSettingsBackend:filename:
*
* The location where the settings are stored on disk.
*
* Defaults to `$XDG_CONFIG_HOME/glib-2.0/settings/keyfile`.
*/
g_object_class_install_property (object_class,
PROP_FILENAME,
g_param_spec_string ("filename",
P_("Filename"),
P_("The filename"),
NULL,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
/**
* GKeyfileSettingsBackend:root-path:
*
* All settings read to or written from the backend must fall under the
* path given in @root_path (which must start and end with a slash and
* not contain two consecutive slashes). @root_path may be "/".
*
* Defaults to "/".
*/
g_object_class_install_property (object_class,
PROP_ROOT_PATH,
g_param_spec_string ("root-path",
P_("Root path"),
P_("The root path"),
NULL,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
/**
* GKeyfileSettingsBackend:root-group:
*
* If @root_group is non-%NULL then it specifies the name of the keyfile
* group used for keys that are written directly below the root path.
*
* Defaults to NULL.
*/
g_object_class_install_property (object_class,
PROP_ROOT_GROUP,
g_param_spec_string ("root-group",
P_("Root group"),
P_("The root group"),
NULL,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
/**
* GKeyfileSettingsBackend:default-dir:
*
* The directory where the system defaults and locks are located.
*
* Defaults to `/etc/glib-2.0/settings`.
*/
g_object_class_install_property (object_class,
PROP_DEFAULTS_DIR,
g_param_spec_string ("defaults-dir",
P_("Default dir"),
P_("Defaults dir"),
NULL,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
}
/**
* g_keyfile_settings_backend_new:
* @filename: the filename of the keyfile
* @root_path: the path under which all settings keys appear
* @root_group: (nullable): the group name corresponding to
* @root_path, or %NULL
*
* Creates a keyfile-backed #GSettingsBackend.
*
* The filename of the keyfile to use is given by @filename.
*
* All settings read to or written from the backend must fall under the
* path given in @root_path (which must start and end with a slash and
* not contain two consecutive slashes). @root_path may be "/".
*
* If @root_group is non-%NULL then it specifies the name of the keyfile
* group used for keys that are written directly below @root_path. For
* example, if @root_path is "/apps/example/" and @root_group is
* "toplevel", then settings the key "/apps/example/enabled" to a value
* of %TRUE will cause the following to appear in the keyfile:
*
* |[
* [toplevel]
* enabled=true
* ]|
*
* If @root_group is %NULL then it is not permitted to store keys
* directly below the @root_path.
*
* For keys not stored directly below @root_path (ie: in a sub-path),
* the name of the subpath (with the final slash stripped) is used as
* the name of the keyfile group. To continue the example, if
* "/apps/example/profiles/default/font-size" were set to
* 12 then the following would appear in the keyfile:
*
* |[
* [profiles/default]
* font-size=12
* ]|
*
* The backend will refuse writes (and return writability as being
* %FALSE) for keys outside of @root_path and, in the event that
* @root_group is %NULL, also for keys directly under @root_path.
* Writes will also be refused if the backend detects that it has the
* inability to rewrite the keyfile (ie: the containing directory is not
* writable).
*
* There is no checking done for your key namespace clashing with the
* syntax of the key file format. For example, if you have '[' or ']'
* characters in your path names or '=' in your key names you may be in
* trouble.
*
* The backend reads default values from a keyfile called `defaults` in
* the directory specified by the #GKeyfileSettingsBackend:defaults-dir property,
* and a list of locked keys from a text file with the name `locks` in
* the same location.
*
* Returns: (transfer full): a keyfile-backed #GSettingsBackend
**/
GSettingsBackend *
g_keyfile_settings_backend_new (const gchar *filename,
const gchar *root_path,
const gchar *root_group)
{
g_return_val_if_fail (filename != NULL, NULL);
g_return_val_if_fail (root_path != NULL, NULL);
g_return_val_if_fail (g_str_has_prefix (root_path, "/"), NULL);
g_return_val_if_fail (g_str_has_suffix (root_path, "/"), NULL);
g_return_val_if_fail (strstr (root_path, "//") == NULL, NULL);
return G_SETTINGS_BACKEND (g_object_new (G_TYPE_KEYFILE_SETTINGS_BACKEND,
"filename", filename,
"root-path", root_path,
"root-group", root_group,
NULL));
}
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