gio/gkeyfilesettingsbackend.c

   1 /*
   2  * Copyright © 2010 Codethink Limited
   3  * Copyright © 2010 Novell, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Authors: Vincent Untz <vuntz@gnome.org>
  19  *          Ryan Lortie <desrt@desrt.ca>
  20  */
  21
  22 #include "config.h"
  23
  24 #include <glib.h>
  25 #include <glibintl.h>
  26
  27 #include <stdio.h>
  28 #include <string.h>
  29
  30 #include "gfile.h"
  31 #include "gfileinfo.h"
  32 #include "gfileenumerator.h"
  33 #include "gfilemonitor.h"
  34 #include "gsimplepermission.h"
  35 #include "gsettingsbackendinternal.h"
  36 #include "giomodule-priv.h"
  37 #include "gportalsupport.h"
  38
  39
  40 #define G_TYPE_KEYFILE_SETTINGS_BACKEND      (g_keyfile_settings_backend_get_type ())
  41 #define G_KEYFILE_SETTINGS_BACKEND(inst)     (G_TYPE_CHECK_INSTANCE_CAST ((inst),      \
  42                                               G_TYPE_KEYFILE_SETTINGS_BACKEND,         \
  43                                               GKeyfileSettingsBackend))
  44 #define G_IS_KEYFILE_SETTINGS_BACKEND(inst)  (G_TYPE_CHECK_INSTANCE_TYPE ((inst),      \
  45                                               G_TYPE_KEYFILE_SETTINGS_BACKEND))
  46
  47
  48 typedef GSettingsBackendClass GKeyfileSettingsBackendClass;
  49
  50 typedef enum {
  51   PROP_FILENAME = 1,
  52   PROP_ROOT_PATH,
  53   PROP_ROOT_GROUP,
  54   PROP_DEFAULTS_DIR
  55 } GKeyfileSettingsBackendProperty;
  56
  57 typedef struct
  58 {
  59   GSettingsBackend   parent_instance;
  60
  61   GKeyFile          *keyfile;
  62   GPermission       *permission;
  63   gboolean           writable;
  64   char              *defaults_dir;
  65   GKeyFile          *system_keyfile;
  66   GHashTable        *system_locks; /* Used as a set, owning the strings it contains */
  67
  68   gchar             *prefix;
  69   gint               prefix_len;
  70   gchar             *root_group;
  71   gint               root_group_len;
  72
  73   GFile             *file;
  74   GFileMonitor      *file_monitor;
  75   guint8             digest[32];
  76   GFile             *dir;
  77   GFileMonitor      *dir_monitor;
  78 } GKeyfileSettingsBackend;
  79
  80 #ifdef G_OS_WIN32
  81 #define EXTENSION_PRIORITY 10
  82 #else
  83 #define EXTENSION_PRIORITY (glib_should_use_portal () ? 110 : 10)
  84 #endif
  85
  86 G_DEFINE_TYPE_WITH_CODE (GKeyfileSettingsBackend,
  87                          g_keyfile_settings_backend,
  88                          G_TYPE_SETTINGS_BACKEND,
  89                          _g_io_modules_ensure_extension_points_registered ();
  90                          g_io_extension_point_implement (G_SETTINGS_BACKEND_EXTENSION_POINT_NAME,
  91                                                          g_define_type_id, "keyfile", EXTENSION_PRIORITY))
  92
  93 static void
  94 compute_checksum (guint8        *digest,
  95                   gconstpointer  contents,
  96                   gsize          length)
  97 {
  98   GChecksum *checksum;
  99   gsize len = 32;
 100
 101   checksum = g_checksum_new (G_CHECKSUM_SHA256);
 102   g_checksum_update (checksum, contents, length);
 103   g_checksum_get_digest (checksum, digest, &len);
 104   g_checksum_free (checksum);
 105   g_assert (len == 32);
 106 }
 107
 108 static void
 109 g_keyfile_settings_backend_keyfile_write (GKeyfileSettingsBackend *kfsb)
 110 {
 111   gchar *contents;
 112   gsize length;
 113
 114   contents = g_key_file_to_data (kfsb->keyfile, &length, NULL);
 115   g_file_replace_contents (kfsb->file, contents, length, NULL, FALSE,
 116                            G_FILE_CREATE_REPLACE_DESTINATION,
 117                            NULL, NULL, NULL);
 118
 119   compute_checksum (kfsb->digest, contents, length);
 120   g_free (contents);
 121 }
 122
 123 static gboolean
 124 group_name_matches (const gchar *group_name,
 125                     const gchar *prefix)
 126 {
 127   /* sort of like g_str_has_prefix() except that it must be an exact
 128    * match or the prefix followed by '/'.
 129    *
 130    * for example 'a' is a prefix of 'a' and 'a/b' but not 'ab'.
 131    */
 132   gint i;
 133
 134   for (i = 0; prefix[i]; i++)
 135     if (prefix[i] != group_name[i])
 136       return FALSE;
 137
 138   return group_name[i] == '\0' || group_name[i] == '/';
 139 }
 140
 141 static gboolean
 142 convert_path (GKeyfileSettingsBackend  *kfsb,
 143               const gchar              *key,
 144               gchar                   **group,
 145               gchar                   **basename)
 146 {
 147   gint key_len = strlen (key);
 148   gint i;
 149
 150   if (key_len < kfsb->prefix_len ||
 151       memcmp (key, kfsb->prefix, kfsb->prefix_len) != 0)
 152     return FALSE;
 153
 154   key_len -= kfsb->prefix_len;
 155   key += kfsb->prefix_len;
 156
 157   for (i = key_len; i >= 0; i--)
 158     if (key[i] == '/')
 159       break;
 160
 161   if (kfsb->root_group)
 162     {
 163       /* if a root_group was specified, make sure the user hasn't given
 164        * a path that ghosts that group name
 165        */
 166       if (i == kfsb->root_group_len && memcmp (key, kfsb->root_group, i) == 0)
 167         return FALSE;
 168     }
 169   else
 170     {
 171       /* if no root_group was given, ensure that the user gave a path */
 172       if (i == -1)
 173         return FALSE;
 174     }
 175
 176   if (group)
 177     {
 178       if (i >= 0)
 179         {
 180           *group = g_memdup (key, i + 1);
 181           (*group)[i] = '\0';
 182         }
 183       else
 184         *group = g_strdup (kfsb->root_group);
 185     }
 186
 187   if (basename)
 188     *basename = g_memdup (key + i + 1, key_len - i);
 189
 190   return TRUE;
 191 }
 192
 193 static gboolean
 194 path_is_valid (GKeyfileSettingsBackend *kfsb,
 195                const gchar             *path)
 196 {
 197   return convert_path (kfsb, path, NULL, NULL);
 198 }
 199
 200 static GVariant *
 201 get_from_keyfile (GKeyfileSettingsBackend *kfsb,
 202                   const GVariantType      *type,
 203                   const gchar             *key)
 204 {
 205   GVariant *return_value = NULL;
 206   gchar *group, *name;
 207
 208   if (convert_path (kfsb, key, &group, &name))
 209     {
 210       gchar *str;
 211       gchar *sysstr;
 212
 213       g_assert (*name);
 214
 215       sysstr = g_key_file_get_value (kfsb->system_keyfile, group, name, NULL);
 216       str = g_key_file_get_value (kfsb->keyfile, group, name, NULL);
 217       if (sysstr &&
 218           (g_hash_table_contains (kfsb->system_locks, key) ||
 219            str == NULL))
 220         {
 221           g_free (str);
 222           str = g_steal_pointer (&sysstr);
 223         }
 224
 225       if (str)
 226         {
 227           return_value = g_variant_parse (type, str, NULL, NULL, NULL);
 228
 229           /* As a special case, support values of type %G_VARIANT_TYPE_STRING
 230            * not being quoted, since users keep forgetting to do it and then
 231            * getting confused. */
 232           if (return_value == NULL &&
 233               g_variant_type_equal (type, G_VARIANT_TYPE_STRING) &&
 234               str[0] != '\"')
 235             {
 236               GString *s = g_string_sized_new (strlen (str) + 2);
 237               char *p = str;
 238
 239               g_string_append_c (s, '\"');
 240               while (*p)
 241                 {
 242                   if (*p == '\"')
 243                     g_string_append_c (s, '\\');
 244                   g_string_append_c (s, *p);
 245                   p++;
 246                 }
 247               g_string_append_c (s, '\"');
 248               return_value = g_variant_parse (type, s->str, NULL, NULL, NULL);
 249               g_string_free (s, TRUE);
 250             }
 251           g_free (str);
 252         }
 253
 254       g_free (sysstr);
 255
 256       g_free (group);
 257       g_free (name);
 258     }
 259
 260   return return_value;
 261 }
 262
 263 static gboolean
 264 set_to_keyfile (GKeyfileSettingsBackend *kfsb,
 265                 const gchar             *key,
 266                 GVariant                *value)
 267 {
 268   gchar *group, *name;
 269
 270   if (g_hash_table_contains (kfsb->system_locks, key))
 271     return FALSE;
 272
 273   if (convert_path (kfsb, key, &group, &name))
 274     {
 275       if (value)
 276         {
 277           gchar *str = g_variant_print (value, FALSE);
 278           g_key_file_set_value (kfsb->keyfile, group, name, str);
 279           g_variant_unref (g_variant_ref_sink (value));
 280           g_free (str);
 281         }
 282       else
 283         {
 284           if (*name == '\0')
 285             {
 286               gchar **groups;
 287               gint i;
 288
 289               groups = g_key_file_get_groups (kfsb->keyfile, NULL);
 290
 291               for (i = 0; groups[i]; i++)
 292                 if (group_name_matches (groups[i], group))
 293                   g_key_file_remove_group (kfsb->keyfile, groups[i], NULL);
 294
 295               g_strfreev (groups);
 296             }
 297           else
 298             g_key_file_remove_key (kfsb->keyfile, group, name, NULL);
 299         }
 300
 301       g_free (group);
 302       g_free (name);
 303
 304       return TRUE;
 305     }
 306
 307   return FALSE;
 308 }
 309
 310 static GVariant *
 311 g_keyfile_settings_backend_read (GSettingsBackend   *backend,
 312                                  const gchar        *key,
 313                                  const GVariantType *expected_type,
 314                                  gboolean            default_value)
 315 {
 316   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (backend);
 317
 318   if (default_value)
 319     return NULL;
 320
 321   return get_from_keyfile (kfsb, expected_type, key);
 322 }
 323
 324 typedef struct
 325 {
 326   GKeyfileSettingsBackend *kfsb;
 327   gboolean failed;
 328 } WriteManyData;
 329
 330 static gboolean
 331 g_keyfile_settings_backend_write_one (gpointer key,
 332                                       gpointer value,
 333                                       gpointer user_data)
 334 {
 335   WriteManyData *data = user_data;
 336   gboolean success;
 337
 338   success = set_to_keyfile (data->kfsb, key, value);
 339   g_assert (success);
 340
 341   return FALSE;
 342 }
 343
 344 static gboolean
 345 g_keyfile_settings_backend_check_one (gpointer key,
 346                                       gpointer value,
 347                                       gpointer user_data)
 348 {
 349   WriteManyData *data = user_data;
 350
 351   return data->failed = g_hash_table_contains (data->kfsb->system_locks, key) ||
 352                         !path_is_valid (data->kfsb, key);
 353 }
 354
 355 static gboolean
 356 g_keyfile_settings_backend_write_tree (GSettingsBackend *backend,
 357                                        GTree            *tree,
 358                                        gpointer          origin_tag)
 359 {
 360   WriteManyData data = { G_KEYFILE_SETTINGS_BACKEND (backend) };
 361
 362   if (!data.kfsb->writable)
 363     return FALSE;
 364
 365   g_tree_foreach (tree, g_keyfile_settings_backend_check_one, &data);
 366
 367   if (data.failed)
 368     return FALSE;
 369
 370   g_tree_foreach (tree, g_keyfile_settings_backend_write_one, &data);
 371   g_keyfile_settings_backend_keyfile_write (data.kfsb);
 372
 373   g_settings_backend_changed_tree (backend, tree, origin_tag);
 374
 375   return TRUE;
 376 }
 377
 378 static gboolean
 379 g_keyfile_settings_backend_write (GSettingsBackend *backend,
 380                                   const gchar      *key,
 381                                   GVariant         *value,
 382                                   gpointer          origin_tag)
 383 {
 384   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (backend);
 385   gboolean success;
 386
 387   if (!kfsb->writable)
 388     return FALSE;
 389
 390   success = set_to_keyfile (kfsb, key, value);
 391
 392   if (success)
 393     {
 394       g_settings_backend_changed (backend, key, origin_tag);
 395       g_keyfile_settings_backend_keyfile_write (kfsb);
 396     }
 397
 398   return success;
 399 }
 400
 401 static void
 402 g_keyfile_settings_backend_reset (GSettingsBackend *backend,
 403                                   const gchar      *key,
 404                                   gpointer          origin_tag)
 405 {
 406   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (backend);
 407
 408   if (set_to_keyfile (kfsb, key, NULL))
 409     g_keyfile_settings_backend_keyfile_write (kfsb);
 410
 411   g_settings_backend_changed (backend, key, origin_tag);
 412 }
 413
 414 static gboolean
 415 g_keyfile_settings_backend_get_writable (GSettingsBackend *backend,
 416                                          const gchar      *name)
 417 {
 418   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (backend);
 419
 420   return kfsb->writable &&
 421          !g_hash_table_contains (kfsb->system_locks, name) &&
 422          path_is_valid (kfsb, name);
 423 }
 424
 425 static GPermission *
 426 g_keyfile_settings_backend_get_permission (GSettingsBackend *backend,
 427                                            const gchar      *path)
 428 {
 429   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (backend);
 430
 431   return g_object_ref (kfsb->permission);
 432 }
 433
 434 static void
 435 keyfile_to_tree (GKeyfileSettingsBackend *kfsb,
 436                  GTree                   *tree,
 437                  GKeyFile                *keyfile,
 438                  gboolean                 dup_check)
 439 {
 440   gchar **groups;
 441   gint i;
 442
 443   groups = g_key_file_get_groups (keyfile, NULL);
 444   for (i = 0; groups[i]; i++)
 445     {
 446       gboolean is_root_group;
 447       gchar **keys;
 448       gint j;
 449
 450       is_root_group = g_strcmp0 (kfsb->root_group, groups[i]) == 0;
 451
 452       /* reject group names that will form invalid key names */
 453       if (!is_root_group &&
 454           (g_str_has_prefix (groups[i], "/") ||
 455            g_str_has_suffix (groups[i], "/") || strstr (groups[i], "//")))
 456         continue;
 457
 458       keys = g_key_file_get_keys (keyfile, groups[i], NULL, NULL);
 459       g_assert (keys != NULL);
 460
 461       for (j = 0; keys[j]; j++)
 462         {
 463           gchar *path, *value;
 464
 465           /* reject key names with slashes in them */
 466           if (strchr (keys[j], '/'))
 467             continue;
 468
 469           if (is_root_group)
 470             path = g_strdup_printf ("%s%s", kfsb->prefix, keys[j]);
 471           else
 472             path = g_strdup_printf ("%s%s/%s", kfsb->prefix, groups[i], keys[j]);
 473
 474           value = g_key_file_get_value (keyfile, groups[i], keys[j], NULL);
 475
 476           if (dup_check && g_strcmp0 (g_tree_lookup (tree, path), value) == 0)
 477             {
 478               g_tree_remove (tree, path);
 479               g_free (value);
 480               g_free (path);
 481             }
 482           else
 483             g_tree_insert (tree, path, value);
 484         }
 485
 486       g_strfreev (keys);
 487     }
 488   g_strfreev (groups);
 489 }
 490
 491 static void
 492 g_keyfile_settings_backend_keyfile_reload (GKeyfileSettingsBackend *kfsb)
 493 {
 494   guint8 digest[32];
 495   gchar *contents;
 496   gsize length;
 497
 498   contents = NULL;
 499   length = 0;
 500
 501   g_file_load_contents (kfsb->file, NULL, &contents, &length, NULL, NULL);
 502   compute_checksum (digest, contents, length);
 503
 504   if (memcmp (kfsb->digest, digest, sizeof digest) != 0)
 505     {
 506       GKeyFile *keyfiles[2];
 507       GTree *tree;
 508
 509       tree = g_tree_new_full ((GCompareDataFunc) strcmp, NULL,
 510                               g_free, g_free);
 511
 512       keyfiles[0] = kfsb->keyfile;
 513       keyfiles[1] = g_key_file_new ();
 514
 515       if (length > 0)
 516         g_key_file_load_from_data (keyfiles[1], contents, length,
 517                                    G_KEY_FILE_KEEP_COMMENTS |
 518                                    G_KEY_FILE_KEEP_TRANSLATIONS, NULL);
 519
 520       keyfile_to_tree (kfsb, tree, keyfiles[0], FALSE);
 521       keyfile_to_tree (kfsb, tree, keyfiles[1], TRUE);
 522       g_key_file_free (keyfiles[0]);
 523       kfsb->keyfile = keyfiles[1];
 524
 525       if (g_tree_nnodes (tree) > 0)
 526         g_settings_backend_changed_tree (&kfsb->parent_instance, tree, NULL);
 527
 528       g_tree_unref (tree);
 529
 530       memcpy (kfsb->digest, digest, sizeof digest);
 531     }
 532
 533   g_free (contents);
 534 }
 535
 536 static void
 537 g_keyfile_settings_backend_keyfile_writable (GKeyfileSettingsBackend *kfsb)
 538 {
 539   GFileInfo *fileinfo;
 540   gboolean writable;
 541
 542   fileinfo = g_file_query_info (kfsb->dir, "access::*", 0, NULL, NULL);
 543
 544   if (fileinfo)
 545     {
 546       writable =
 547         g_file_info_get_attribute_boolean (fileinfo, G_FILE_ATTRIBUTE_ACCESS_CAN_WRITE) &&
 548         g_file_info_get_attribute_boolean (fileinfo, G_FILE_ATTRIBUTE_ACCESS_CAN_EXECUTE);
 549       g_object_unref (fileinfo);
 550     }
 551   else
 552     writable = FALSE;
 553
 554   if (writable != kfsb->writable)
 555     {
 556       kfsb->writable = writable;
 557       g_settings_backend_path_writable_changed (&kfsb->parent_instance, "/");
 558     }
 559 }
 560
 561 static void
 562 g_keyfile_settings_backend_finalize (GObject *object)
 563 {
 564   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (object);
 565
 566   g_key_file_free (kfsb->keyfile);
 567   g_object_unref (kfsb->permission);
 568   g_key_file_unref (kfsb->system_keyfile);
 569   g_hash_table_unref (kfsb->system_locks);
 570   g_free (kfsb->defaults_dir);
 571
 572   g_file_monitor_cancel (kfsb->file_monitor);
 573   g_object_unref (kfsb->file_monitor);
 574   g_object_unref (kfsb->file);
 575
 576   g_file_monitor_cancel (kfsb->dir_monitor);
 577   g_object_unref (kfsb->dir_monitor);
 578   g_object_unref (kfsb->dir);
 579
 580   g_free (kfsb->root_group);
 581   g_free (kfsb->prefix);
 582
 583   G_OBJECT_CLASS (g_keyfile_settings_backend_parent_class)
 584     ->finalize (object);
 585 }
 586
 587 static void
 588 g_keyfile_settings_backend_init (GKeyfileSettingsBackend *kfsb)
 589 {
 590 }
 591
 592 static void
 593 file_changed (GFileMonitor      *monitor,
 594               GFile             *file,
 595               GFile             *other_file,
 596               GFileMonitorEvent  event_type,
 597               gpointer           user_data)
 598 {
 599   GKeyfileSettingsBackend *kfsb = user_data;
 600
 601   /* Ignore file deletions, let the GKeyFile content remain in tact. */
 602   if (event_type != G_FILE_MONITOR_EVENT_DELETED)
 603     g_keyfile_settings_backend_keyfile_reload (kfsb);
 604 }
 605
 606 static void
 607 dir_changed (GFileMonitor       *monitor,
 608               GFile             *file,
 609               GFile             *other_file,
 610               GFileMonitorEvent  event_type,
 611               gpointer           user_data)
 612 {
 613   GKeyfileSettingsBackend *kfsb = user_data;
 614
 615   g_keyfile_settings_backend_keyfile_writable (kfsb);
 616 }
 617
 618 static void
 619 load_system_settings (GKeyfileSettingsBackend *kfsb)
 620 {
 621   GError *error = NULL;
 622   const char *dir = "/etc/glib-2.0/settings";
 623   char *path;
 624   char *contents;
 625
 626   kfsb->system_keyfile = g_key_file_new ();
 627   kfsb->system_locks = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
 628
 629   if (kfsb->defaults_dir)
 630     dir = kfsb->defaults_dir;
 631
 632   path = g_build_filename (dir, "defaults", NULL);
 633
 634   /* The defaults are in the same keyfile format that we use for the settings.
 635    * It can be produced from a dconf database using: dconf dump
 636    */
 637   if (!g_key_file_load_from_file (kfsb->system_keyfile, path, G_KEY_FILE_NONE, &error))
 638     {
 639       if (!g_error_matches (error, G_FILE_ERROR, G_FILE_ERROR_NOENT))
 640         g_warning ("Failed to read %s: %s", path, error->message);
 641       g_clear_error (&error);
 642     }
 643   else
 644     g_debug ("Loading default settings from %s", path);
 645
 646   g_free (path);
 647
 648   path = g_build_filename (dir, "locks", NULL);
 649
 650   /* The locks file is a text file containing a list paths to lock, one per line.
 651    * It can be produced from a dconf database using: dconf list-locks
 652    */
 653   if (!g_file_get_contents (path, &contents, NULL, &error))
 654     {
 655       if (!g_error_matches (error, G_FILE_ERROR, G_FILE_ERROR_NOENT))
 656         g_warning ("Failed to read %s: %s", path, error->message);
 657       g_clear_error (&error);
 658     }
 659   else
 660     {
 661       char **lines;
 662       gsize i;
 663
 664       g_debug ("Loading locks from %s", path);
 665
 666       lines = g_strsplit (contents, "\n", 0);
 667       for (i = 0; lines[i]; i++)
 668         {
 669           char *line = lines[i];
 670           if (line[0] == '#' || line[0] == '\0')
 671             {
 672               g_free (line);
 673               continue;
 674             }
 675
 676           g_debug ("Locking key %s", line);
 677           g_hash_table_add (kfsb->system_locks, g_steal_pointer (&line));
 678         }
 679
 680       g_free (lines);
 681     }
 682   g_free (contents);
 683
 684   g_free (path);
 685 }
 686
 687 static void
 688 g_keyfile_settings_backend_constructed (GObject *object)
 689 {
 690   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (object);
 691
 692   if (kfsb->file == NULL)
 693     {
 694       char *filename = g_build_filename (g_get_user_config_dir (),
 695                                          "glib-2.0", "settings", "keyfile",
 696                                          NULL);
 697       kfsb->file = g_file_new_for_path (filename);
 698       g_free (filename);
 699     }
 700
 701   if (kfsb->prefix == NULL)
 702     {
 703       kfsb->prefix = g_strdup ("/");
 704       kfsb->prefix_len = 1;
 705     }
 706
 707   kfsb->keyfile = g_key_file_new ();
 708   kfsb->permission = g_simple_permission_new (TRUE);
 709
 710   kfsb->dir = g_file_get_parent (kfsb->file);
 711   g_file_make_directory_with_parents (kfsb->dir, NULL, NULL);
 712
 713   kfsb->file_monitor = g_file_monitor (kfsb->file, G_FILE_MONITOR_NONE, NULL, NULL);
 714   kfsb->dir_monitor = g_file_monitor (kfsb->dir, G_FILE_MONITOR_NONE, NULL, NULL);
 715
 716   compute_checksum (kfsb->digest, NULL, 0);
 717
 718   g_signal_connect (kfsb->file_monitor, "changed",
 719                     G_CALLBACK (file_changed), kfsb);
 720   g_signal_connect (kfsb->dir_monitor, "changed",
 721                     G_CALLBACK (dir_changed), kfsb);
 722
 723   g_keyfile_settings_backend_keyfile_writable (kfsb);
 724   g_keyfile_settings_backend_keyfile_reload (kfsb);
 725
 726   load_system_settings (kfsb);
 727 }
 728
 729 static void
 730 g_keyfile_settings_backend_set_property (GObject      *object,
 731                                          guint         prop_id,
 732                                          const GValue *value,
 733                                          GParamSpec   *pspec)
 734 {
 735   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (object);
 736
 737   switch ((GKeyfileSettingsBackendProperty)prop_id)
 738     {
 739     case PROP_FILENAME:
 740       /* Construct only. */
 741       g_assert (kfsb->file == NULL);
 742       kfsb->file = g_file_new_for_path (g_value_get_string (value));
 743       break;
 744
 745     case PROP_ROOT_PATH:
 746       /* Construct only. */
 747       g_assert (kfsb->prefix == NULL);
 748       kfsb->prefix = g_value_dup_string (value);
 749       if (kfsb->prefix)
 750         kfsb->prefix_len = strlen (kfsb->prefix);
 751       break;
 752
 753     case PROP_ROOT_GROUP:
 754       /* Construct only. */
 755       g_assert (kfsb->root_group == NULL);
 756       kfsb->root_group = g_value_dup_string (value);
 757       if (kfsb->root_group)
 758         kfsb->root_group_len = strlen (kfsb->root_group);
 759       break;
 760
 761     case PROP_DEFAULTS_DIR:
 762       /* Construct only. */
 763       g_assert (kfsb->defaults_dir == NULL);
 764       kfsb->defaults_dir = g_value_dup_string (value);
 765       break;
 766
 767     default:
 768       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 769       break;
 770     }
 771 }
 772
 773 static void
 774 g_keyfile_settings_backend_get_property (GObject    *object,
 775                                          guint       prop_id,
 776                                          GValue     *value,
 777                                          GParamSpec *pspec)
 778 {
 779   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (object);
 780
 781   switch ((GKeyfileSettingsBackendProperty)prop_id)
 782     {
 783     case PROP_FILENAME:
 784       g_value_set_string (value, g_file_peek_path (kfsb->file));
 785       break;
 786
 787     case PROP_ROOT_PATH:
 788       g_value_set_string (value, kfsb->prefix);
 789       break;
 790
 791     case PROP_ROOT_GROUP:
 792       g_value_set_string (value, kfsb->root_group);
 793       break;
 794
 795     case PROP_DEFAULTS_DIR:
 796       g_value_set_string (value, kfsb->defaults_dir);
 797       break;
 798
 799     default:
 800       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 801       break;
 802     }
 803 }
 804
 805 static void
 806 g_keyfile_settings_backend_class_init (GKeyfileSettingsBackendClass *class)
 807 {
 808   GObjectClass *object_class = G_OBJECT_CLASS (class);
 809
 810   object_class->finalize = g_keyfile_settings_backend_finalize;
 811   object_class->constructed = g_keyfile_settings_backend_constructed;
 812   object_class->get_property = g_keyfile_settings_backend_get_property;
 813   object_class->set_property = g_keyfile_settings_backend_set_property;
 814
 815   class->read = g_keyfile_settings_backend_read;
 816   class->write = g_keyfile_settings_backend_write;
 817   class->write_tree = g_keyfile_settings_backend_write_tree;
 818   class->reset = g_keyfile_settings_backend_reset;
 819   class->get_writable = g_keyfile_settings_backend_get_writable;
 820   class->get_permission = g_keyfile_settings_backend_get_permission;
 821   /* No need to implement subscribed/unsubscribe: the only point would be to
 822    * stop monitoring the file when there's no GSettings anymore, which is no
 823    * big win.
 824    */
 825
 826   /**
 827    * GKeyfileSettingsBackend:filename:
 828    *
 829    * The location where the settings are stored on disk.
 830    *
 831    * Defaults to `$XDG_CONFIG_HOME/glib-2.0/settings/keyfile`.
 832    */
 833   g_object_class_install_property (object_class,
 834                                    PROP_FILENAME,
 835                                    g_param_spec_string ("filename",
 836                                                         P_("Filename"),
 837                                                         P_("The filename"),
 838                                                         NULL,
 839                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
 840                                                         G_PARAM_STATIC_STRINGS));
 841
 842   /**
 843    * GKeyfileSettingsBackend:root-path:
 844    *
 845    * All settings read to or written from the backend must fall under the
 846    * path given in @root_path (which must start and end with a slash and
 847    * not contain two consecutive slashes).  @root_path may be "/".
 848    *
 849    * Defaults to "/".
 850    */
 851   g_object_class_install_property (object_class,
 852                                    PROP_ROOT_PATH,
 853                                    g_param_spec_string ("root-path",
 854                                                         P_("Root path"),
 855                                                         P_("The root path"),
 856                                                         NULL,
 857                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
 858                                                         G_PARAM_STATIC_STRINGS));
 859
 860   /**
 861    * GKeyfileSettingsBackend:root-group:
 862    *
 863    * If @root_group is non-%NULL then it specifies the name of the keyfile
 864    * group used for keys that are written directly below the root path.
 865    *
 866    * Defaults to NULL.
 867    */
 868   g_object_class_install_property (object_class,
 869                                    PROP_ROOT_GROUP,
 870                                    g_param_spec_string ("root-group",
 871                                                         P_("Root group"),
 872                                                         P_("The root group"),
 873                                                         NULL,
 874                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
 875                                                         G_PARAM_STATIC_STRINGS));
 876
 877   /**
 878    * GKeyfileSettingsBackend:default-dir:
 879    *
 880    * The directory where the system defaults and locks are located.
 881    *
 882    * Defaults to `/etc/glib-2.0/settings`.
 883    */
 884   g_object_class_install_property (object_class,
 885                                    PROP_DEFAULTS_DIR,
 886                                    g_param_spec_string ("defaults-dir",
 887                                                         P_("Default dir"),
 888                                                         P_("Defaults dir"),
 889                                                         NULL,
 890                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
 891                                                         G_PARAM_STATIC_STRINGS));
 892 }
 893
 894 /**
 895  * g_keyfile_settings_backend_new:
 896  * @filename: the filename of the keyfile
 897  * @root_path: the path under which all settings keys appear
 898  * @root_group: (nullable): the group name corresponding to
 899  *              @root_path, or %NULL
 900  *
 901  * Creates a keyfile-backed #GSettingsBackend.
 902  *
 903  * The filename of the keyfile to use is given by @filename.
 904  *
 905  * All settings read to or written from the backend must fall under the
 906  * path given in @root_path (which must start and end with a slash and
 907  * not contain two consecutive slashes).  @root_path may be "/".
 908  *
 909  * If @root_group is non-%NULL then it specifies the name of the keyfile
 910  * group used for keys that are written directly below @root_path.  For
 911  * example, if @root_path is "/apps/example/" and @root_group is
 912  * "toplevel", then settings the key "/apps/example/enabled" to a value
 913  * of %TRUE will cause the following to appear in the keyfile:
 914  *
 915  * |[
 916  *   [toplevel]
 917  *   enabled=true
 918  * ]|
 919  *
 920  * If @root_group is %NULL then it is not permitted to store keys
 921  * directly below the @root_path.
 922  *
 923  * For keys not stored directly below @root_path (ie: in a sub-path),
 924  * the name of the subpath (with the final slash stripped) is used as
 925  * the name of the keyfile group.  To continue the example, if
 926  * "/apps/example/profiles/default/font-size" were set to
 927  * 12 then the following would appear in the keyfile:
 928  *
 929  * |[
 930  *   [profiles/default]
 931  *   font-size=12
 932  * ]|
 933  *
 934  * The backend will refuse writes (and return writability as being
 935  * %FALSE) for keys outside of @root_path and, in the event that
 936  * @root_group is %NULL, also for keys directly under @root_path.
 937  * Writes will also be refused if the backend detects that it has the
 938  * inability to rewrite the keyfile (ie: the containing directory is not
 939  * writable).
 940  *
 941  * There is no checking done for your key namespace clashing with the
 942  * syntax of the key file format.  For example, if you have '[' or ']'
 943  * characters in your path names or '=' in your key names you may be in
 944  * trouble.
 945  *
 946  * The backend reads default values from a keyfile called `defaults` in
 947  * the directory specified by the #GKeyfileSettingsBackend:defaults-dir property,
 948  * and a list of locked keys from a text file with the name `locks` in
 949  * the same location.
 950  *
 951  * Returns: (transfer full): a keyfile-backed #GSettingsBackend
 952  **/
 953 GSettingsBackend *
 954 g_keyfile_settings_backend_new (const gchar *filename,
 955                                 const gchar *root_path,
 956                                 const gchar *root_group)
 957 {
 958   g_return_val_if_fail (filename != NULL, NULL);
 959   g_return_val_if_fail (root_path != NULL, NULL);
 960   g_return_val_if_fail (g_str_has_prefix (root_path, "/"), NULL);
 961   g_return_val_if_fail (g_str_has_suffix (root_path, "/"), NULL);
 962   g_return_val_if_fail (strstr (root_path, "//") == NULL, NULL);
 963
 964   return G_SETTINGS_BACKEND (g_object_new (G_TYPE_KEYFILE_SETTINGS_BACKEND,
 965                                            "filename", filename,
 966                                            "root-path", root_path,
 967                                            "root-group", root_group,
 968                                            NULL));
 969 }