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 () && !glib_has_dconf_access_in_sandbox () ? 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 gboolean
 109 g_keyfile_settings_backend_keyfile_write (GKeyfileSettingsBackend  *kfsb,
 110                                           GError                  **error)
 111 {
 112   gchar *contents;
 113   gsize length;
 114   gboolean success;
 115
 116   contents = g_key_file_to_data (kfsb->keyfile, &length, NULL);
 117   success = g_file_replace_contents (kfsb->file, contents, length, NULL, FALSE,
 118                                      G_FILE_CREATE_REPLACE_DESTINATION |
 119                                      G_FILE_CREATE_PRIVATE,
 120                                      NULL, NULL, error);
 121
 122   compute_checksum (kfsb->digest, contents, length);
 123   g_free (contents);
 124
 125   return success;
 126 }
 127
 128 static gboolean
 129 group_name_matches (const gchar *group_name,
 130                     const gchar *prefix)
 131 {
 132   /* sort of like g_str_has_prefix() except that it must be an exact
 133    * match or the prefix followed by '/'.
 134    *
 135    * for example 'a' is a prefix of 'a' and 'a/b' but not 'ab'.
 136    */
 137   gint i;
 138
 139   for (i = 0; prefix[i]; i++)
 140     if (prefix[i] != group_name[i])
 141       return FALSE;
 142
 143   return group_name[i] == '\0' || group_name[i] == '/';
 144 }
 145
 146 static gboolean
 147 convert_path (GKeyfileSettingsBackend  *kfsb,
 148               const gchar              *key,
 149               gchar                   **group,
 150               gchar                   **basename)
 151 {
 152   gsize key_len = strlen (key);
 153   const gchar *last_slash;
 154
 155   if (key_len < kfsb->prefix_len ||
 156       memcmp (key, kfsb->prefix, kfsb->prefix_len) != 0)
 157     return FALSE;
 158
 159   key_len -= kfsb->prefix_len;
 160   key += kfsb->prefix_len;
 161
 162   last_slash = strrchr (key, '/');
 163
 164   /* Disallow empty group names or key names */
 165   if (key_len == 0 ||
 166       (last_slash != NULL &&
 167        (*(last_slash + 1) == '\0' ||
 168         last_slash == key)))
 169     return FALSE;
 170
 171   if (kfsb->root_group)
 172     {
 173       /* if a root_group was specified, make sure the user hasn't given
 174        * a path that ghosts that group name
 175        */
 176       if (last_slash != NULL && (last_slash - key) == kfsb->root_group_len && memcmp (key, kfsb->root_group, last_slash - key) == 0)
 177         return FALSE;
 178     }
 179   else
 180     {
 181       /* if no root_group was given, ensure that the user gave a path */
 182       if (last_slash == NULL)
 183         return FALSE;
 184     }
 185
 186   if (group)
 187     {
 188       if (last_slash != NULL)
 189         {
 190           *group = g_memdup2 (key, (last_slash - key) + 1);
 191           (*group)[(last_slash - key)] = '\0';
 192         }
 193       else
 194         *group = g_strdup (kfsb->root_group);
 195     }
 196
 197   if (basename)
 198     {
 199       if (last_slash != NULL)
 200         *basename = g_memdup2 (last_slash + 1, key_len - (last_slash - key));
 201       else
 202         *basename = g_strdup (key);
 203     }
 204
 205   return TRUE;
 206 }
 207
 208 static gboolean
 209 path_is_valid (GKeyfileSettingsBackend *kfsb,
 210                const gchar             *path)
 211 {
 212   return convert_path (kfsb, path, NULL, NULL);
 213 }
 214
 215 static GVariant *
 216 get_from_keyfile (GKeyfileSettingsBackend *kfsb,
 217                   const GVariantType      *type,
 218                   const gchar             *key)
 219 {
 220   GVariant *return_value = NULL;
 221   gchar *group, *name;
 222
 223   if (convert_path (kfsb, key, &group, &name))
 224     {
 225       gchar *str;
 226       gchar *sysstr;
 227
 228       g_assert (*name);
 229
 230       sysstr = g_key_file_get_value (kfsb->system_keyfile, group, name, NULL);
 231       str = g_key_file_get_value (kfsb->keyfile, group, name, NULL);
 232       if (sysstr &&
 233           (g_hash_table_contains (kfsb->system_locks, key) ||
 234            str == NULL))
 235         {
 236           g_free (str);
 237           str = g_steal_pointer (&sysstr);
 238         }
 239
 240       if (str)
 241         {
 242           return_value = g_variant_parse (type, str, NULL, NULL, NULL);
 243
 244           /* As a special case, support values of type %G_VARIANT_TYPE_STRING
 245            * not being quoted, since users keep forgetting to do it and then
 246            * getting confused. */
 247           if (return_value == NULL &&
 248               g_variant_type_equal (type, G_VARIANT_TYPE_STRING) &&
 249               str[0] != '\"')
 250             {
 251               GString *s = g_string_sized_new (strlen (str) + 2);
 252               char *p = str;
 253
 254               g_string_append_c (s, '\"');
 255               while (*p)
 256                 {
 257                   if (*p == '\"')
 258                     g_string_append_c (s, '\\');
 259                   g_string_append_c (s, *p);
 260                   p++;
 261                 }
 262               g_string_append_c (s, '\"');
 263               return_value = g_variant_parse (type, s->str, NULL, NULL, NULL);
 264               g_string_free (s, TRUE);
 265             }
 266           g_free (str);
 267         }
 268
 269       g_free (sysstr);
 270
 271       g_free (group);
 272       g_free (name);
 273     }
 274
 275   return return_value;
 276 }
 277
 278 static gboolean
 279 set_to_keyfile (GKeyfileSettingsBackend *kfsb,
 280                 const gchar             *key,
 281                 GVariant                *value)
 282 {
 283   gchar *group, *name;
 284
 285   if (g_hash_table_contains (kfsb->system_locks, key))
 286     return FALSE;
 287
 288   if (convert_path (kfsb, key, &group, &name))
 289     {
 290       if (value)
 291         {
 292           gchar *str = g_variant_print (value, FALSE);
 293           g_key_file_set_value (kfsb->keyfile, group, name, str);
 294           g_variant_unref (g_variant_ref_sink (value));
 295           g_free (str);
 296         }
 297       else
 298         {
 299           if (*name == '\0')
 300             {
 301               gchar **groups;
 302               gint i;
 303
 304               groups = g_key_file_get_groups (kfsb->keyfile, NULL);
 305
 306               for (i = 0; groups[i]; i++)
 307                 if (group_name_matches (groups[i], group))
 308                   g_key_file_remove_group (kfsb->keyfile, groups[i], NULL);
 309
 310               g_strfreev (groups);
 311             }
 312           else
 313             g_key_file_remove_key (kfsb->keyfile, group, name, NULL);
 314         }
 315
 316       g_free (group);
 317       g_free (name);
 318
 319       return TRUE;
 320     }
 321
 322   return FALSE;
 323 }
 324
 325 static GVariant *
 326 g_keyfile_settings_backend_read (GSettingsBackend   *backend,
 327                                  const gchar        *key,
 328                                  const GVariantType *expected_type,
 329                                  gboolean            default_value)
 330 {
 331   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (backend);
 332
 333   if (default_value)
 334     return NULL;
 335
 336   return get_from_keyfile (kfsb, expected_type, key);
 337 }
 338
 339 typedef struct
 340 {
 341   GKeyfileSettingsBackend *kfsb;
 342   gboolean failed;
 343 } WriteManyData;
 344
 345 static gboolean
 346 g_keyfile_settings_backend_write_one (gpointer key,
 347                                       gpointer value,
 348                                       gpointer user_data)
 349 {
 350   WriteManyData *data = user_data;
 351   gboolean success G_GNUC_UNUSED  /* when compiling with G_DISABLE_ASSERT */;
 352
 353   success = set_to_keyfile (data->kfsb, key, value);
 354   g_assert (success);
 355
 356   return FALSE;
 357 }
 358
 359 static gboolean
 360 g_keyfile_settings_backend_check_one (gpointer key,
 361                                       gpointer value,
 362                                       gpointer user_data)
 363 {
 364   WriteManyData *data = user_data;
 365
 366   return data->failed = g_hash_table_contains (data->kfsb->system_locks, key) ||
 367                         !path_is_valid (data->kfsb, key);
 368 }
 369
 370 static gboolean
 371 g_keyfile_settings_backend_write_tree (GSettingsBackend *backend,
 372                                        GTree            *tree,
 373                                        gpointer          origin_tag)
 374 {
 375   WriteManyData data = { G_KEYFILE_SETTINGS_BACKEND (backend), 0 };
 376   gboolean success;
 377   GError *error = NULL;
 378
 379   if (!data.kfsb->writable)
 380     return FALSE;
 381
 382   g_tree_foreach (tree, g_keyfile_settings_backend_check_one, &data);
 383
 384   if (data.failed)
 385     return FALSE;
 386
 387   g_tree_foreach (tree, g_keyfile_settings_backend_write_one, &data);
 388   success = g_keyfile_settings_backend_keyfile_write (data.kfsb, &error);
 389   if (error)
 390     {
 391       g_warning ("Failed to write keyfile to %s: %s", g_file_peek_path (data.kfsb->file), error->message);
 392       g_error_free (error);
 393     }
 394
 395   g_settings_backend_changed_tree (backend, tree, origin_tag);
 396
 397   return success;
 398 }
 399
 400 static gboolean
 401 g_keyfile_settings_backend_write (GSettingsBackend *backend,
 402                                   const gchar      *key,
 403                                   GVariant         *value,
 404                                   gpointer          origin_tag)
 405 {
 406   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (backend);
 407   gboolean success;
 408   GError *error = NULL;
 409
 410   if (!kfsb->writable)
 411     return FALSE;
 412
 413   success = set_to_keyfile (kfsb, key, value);
 414
 415   if (success)
 416     {
 417       g_settings_backend_changed (backend, key, origin_tag);
 418       success = g_keyfile_settings_backend_keyfile_write (kfsb, &error);
 419       if (error)
 420         {
 421           g_warning ("Failed to write keyfile to %s: %s", g_file_peek_path (kfsb->file), error->message);
 422           g_error_free (error);
 423         }
 424     }
 425
 426   return success;
 427 }
 428
 429 static void
 430 g_keyfile_settings_backend_reset (GSettingsBackend *backend,
 431                                   const gchar      *key,
 432                                   gpointer          origin_tag)
 433 {
 434   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (backend);
 435   GError *error = NULL;
 436
 437   if (set_to_keyfile (kfsb, key, NULL))
 438     {
 439       g_keyfile_settings_backend_keyfile_write (kfsb, &error);
 440       if (error)
 441         {
 442           g_warning ("Failed to write keyfile to %s: %s", g_file_peek_path (kfsb->file), error->message);
 443           g_error_free (error);
 444         }
 445     }
 446
 447   g_settings_backend_changed (backend, key, origin_tag);
 448 }
 449
 450 static gboolean
 451 g_keyfile_settings_backend_get_writable (GSettingsBackend *backend,
 452                                          const gchar      *name)
 453 {
 454   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (backend);
 455
 456   return kfsb->writable &&
 457          !g_hash_table_contains (kfsb->system_locks, name) &&
 458          path_is_valid (kfsb, name);
 459 }
 460
 461 static GPermission *
 462 g_keyfile_settings_backend_get_permission (GSettingsBackend *backend,
 463                                            const gchar      *path)
 464 {
 465   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (backend);
 466
 467   return g_object_ref (kfsb->permission);
 468 }
 469
 470 static void
 471 keyfile_to_tree (GKeyfileSettingsBackend *kfsb,
 472                  GTree                   *tree,
 473                  GKeyFile                *keyfile,
 474                  gboolean                 dup_check)
 475 {
 476   gchar **groups;
 477   gint i;
 478
 479   groups = g_key_file_get_groups (keyfile, NULL);
 480   for (i = 0; groups[i]; i++)
 481     {
 482       gboolean is_root_group;
 483       gchar **keys;
 484       gint j;
 485
 486       is_root_group = g_strcmp0 (kfsb->root_group, groups[i]) == 0;
 487
 488       /* reject group names that will form invalid key names */
 489       if (!is_root_group &&
 490           (g_str_has_prefix (groups[i], "/") ||
 491            g_str_has_suffix (groups[i], "/") || strstr (groups[i], "//")))
 492         continue;
 493
 494       keys = g_key_file_get_keys (keyfile, groups[i], NULL, NULL);
 495       g_assert (keys != NULL);
 496
 497       for (j = 0; keys[j]; j++)
 498         {
 499           gchar *path, *value;
 500
 501           /* reject key names with slashes in them */
 502           if (strchr (keys[j], '/'))
 503             continue;
 504
 505           if (is_root_group)
 506             path = g_strdup_printf ("%s%s", kfsb->prefix, keys[j]);
 507           else
 508             path = g_strdup_printf ("%s%s/%s", kfsb->prefix, groups[i], keys[j]);
 509
 510           value = g_key_file_get_value (keyfile, groups[i], keys[j], NULL);
 511
 512           if (dup_check && g_strcmp0 (g_tree_lookup (tree, path), value) == 0)
 513             {
 514               g_tree_remove (tree, path);
 515               g_free (value);
 516               g_free (path);
 517             }
 518           else
 519             g_tree_insert (tree, path, value);
 520         }
 521
 522       g_strfreev (keys);
 523     }
 524   g_strfreev (groups);
 525 }
 526
 527 static void
 528 g_keyfile_settings_backend_keyfile_reload (GKeyfileSettingsBackend *kfsb)
 529 {
 530   guint8 digest[32];
 531   gchar *contents;
 532   gsize length;
 533
 534   contents = NULL;
 535   length = 0;
 536
 537   g_file_load_contents (kfsb->file, NULL, &contents, &length, NULL, NULL);
 538   compute_checksum (digest, contents, length);
 539
 540   if (memcmp (kfsb->digest, digest, sizeof digest) != 0)
 541     {
 542       GKeyFile *keyfiles[2];
 543       GTree *tree;
 544
 545       tree = g_tree_new_full ((GCompareDataFunc) strcmp, NULL,
 546                               g_free, g_free);
 547
 548       keyfiles[0] = kfsb->keyfile;
 549       keyfiles[1] = g_key_file_new ();
 550
 551       if (length > 0)
 552         g_key_file_load_from_data (keyfiles[1], contents, length,
 553                                    G_KEY_FILE_KEEP_COMMENTS |
 554                                    G_KEY_FILE_KEEP_TRANSLATIONS, NULL);
 555
 556       keyfile_to_tree (kfsb, tree, keyfiles[0], FALSE);
 557       keyfile_to_tree (kfsb, tree, keyfiles[1], TRUE);
 558       g_key_file_free (keyfiles[0]);
 559       kfsb->keyfile = keyfiles[1];
 560
 561       if (g_tree_nnodes (tree) > 0)
 562         g_settings_backend_changed_tree (&kfsb->parent_instance, tree, NULL);
 563
 564       g_tree_unref (tree);
 565
 566       memcpy (kfsb->digest, digest, sizeof digest);
 567     }
 568
 569   g_free (contents);
 570 }
 571
 572 static void
 573 g_keyfile_settings_backend_keyfile_writable (GKeyfileSettingsBackend *kfsb)
 574 {
 575   GFileInfo *fileinfo;
 576   gboolean writable;
 577
 578   fileinfo = g_file_query_info (kfsb->dir, "access::*", 0, NULL, NULL);
 579
 580   if (fileinfo)
 581     {
 582       writable =
 583         g_file_info_get_attribute_boolean (fileinfo, G_FILE_ATTRIBUTE_ACCESS_CAN_WRITE) &&
 584         g_file_info_get_attribute_boolean (fileinfo, G_FILE_ATTRIBUTE_ACCESS_CAN_EXECUTE);
 585       g_object_unref (fileinfo);
 586     }
 587   else
 588     writable = FALSE;
 589
 590   if (writable != kfsb->writable)
 591     {
 592       kfsb->writable = writable;
 593       g_settings_backend_path_writable_changed (&kfsb->parent_instance, "/");
 594     }
 595 }
 596
 597 static void
 598 g_keyfile_settings_backend_finalize (GObject *object)
 599 {
 600   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (object);
 601
 602   g_key_file_free (kfsb->keyfile);
 603   g_object_unref (kfsb->permission);
 604   g_key_file_unref (kfsb->system_keyfile);
 605   g_hash_table_unref (kfsb->system_locks);
 606   g_free (kfsb->defaults_dir);
 607
 608   g_file_monitor_cancel (kfsb->file_monitor);
 609   g_object_unref (kfsb->file_monitor);
 610   g_object_unref (kfsb->file);
 611
 612   g_file_monitor_cancel (kfsb->dir_monitor);
 613   g_object_unref (kfsb->dir_monitor);
 614   g_object_unref (kfsb->dir);
 615
 616   g_free (kfsb->root_group);
 617   g_free (kfsb->prefix);
 618
 619   G_OBJECT_CLASS (g_keyfile_settings_backend_parent_class)
 620     ->finalize (object);
 621 }
 622
 623 static void
 624 g_keyfile_settings_backend_init (GKeyfileSettingsBackend *kfsb)
 625 {
 626 }
 627
 628 static void
 629 file_changed (GFileMonitor      *monitor,
 630               GFile             *file,
 631               GFile             *other_file,
 632               GFileMonitorEvent  event_type,
 633               gpointer           user_data)
 634 {
 635   GKeyfileSettingsBackend *kfsb = user_data;
 636
 637   /* Ignore file deletions, let the GKeyFile content remain in tact. */
 638   if (event_type != G_FILE_MONITOR_EVENT_DELETED)
 639     g_keyfile_settings_backend_keyfile_reload (kfsb);
 640 }
 641
 642 static void
 643 dir_changed (GFileMonitor       *monitor,
 644               GFile             *file,
 645               GFile             *other_file,
 646               GFileMonitorEvent  event_type,
 647               gpointer           user_data)
 648 {
 649   GKeyfileSettingsBackend *kfsb = user_data;
 650
 651   g_keyfile_settings_backend_keyfile_writable (kfsb);
 652 }
 653
 654 static void
 655 load_system_settings (GKeyfileSettingsBackend *kfsb)
 656 {
 657   GError *error = NULL;
 658   const char *dir = "/etc/glib-2.0/settings";
 659   char *path;
 660   char *contents;
 661
 662   kfsb->system_keyfile = g_key_file_new ();
 663   kfsb->system_locks = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
 664
 665   if (kfsb->defaults_dir)
 666     dir = kfsb->defaults_dir;
 667
 668   path = g_build_filename (dir, "defaults", NULL);
 669
 670   /* The defaults are in the same keyfile format that we use for the settings.
 671    * It can be produced from a dconf database using: dconf dump
 672    */
 673   if (!g_key_file_load_from_file (kfsb->system_keyfile, path, G_KEY_FILE_NONE, &error))
 674     {
 675       if (!g_error_matches (error, G_FILE_ERROR, G_FILE_ERROR_NOENT))
 676         g_warning ("Failed to read %s: %s", path, error->message);
 677       g_clear_error (&error);
 678     }
 679   else
 680     g_debug ("Loading default settings from %s", path);
 681
 682   g_free (path);
 683
 684   path = g_build_filename (dir, "locks", NULL);
 685
 686   /* The locks file is a text file containing a list paths to lock, one per line.
 687    * It can be produced from a dconf database using: dconf list-locks
 688    */
 689   if (!g_file_get_contents (path, &contents, NULL, &error))
 690     {
 691       if (!g_error_matches (error, G_FILE_ERROR, G_FILE_ERROR_NOENT))
 692         g_warning ("Failed to read %s: %s", path, error->message);
 693       g_clear_error (&error);
 694     }
 695   else
 696     {
 697       char **lines;
 698       gsize i;
 699
 700       g_debug ("Loading locks from %s", path);
 701
 702       lines = g_strsplit (contents, "\n", 0);
 703       for (i = 0; lines[i]; i++)
 704         {
 705           char *line = lines[i];
 706           if (line[0] == '#' || line[0] == '\0')
 707             {
 708               g_free (line);
 709               continue;
 710             }
 711
 712           g_debug ("Locking key %s", line);
 713           g_hash_table_add (kfsb->system_locks, g_steal_pointer (&line));
 714         }
 715
 716       g_free (lines);
 717     }
 718   g_free (contents);
 719
 720   g_free (path);
 721 }
 722
 723 static void
 724 g_keyfile_settings_backend_constructed (GObject *object)
 725 {
 726   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (object);
 727   const char *path;
 728
 729   if (kfsb->file == NULL)
 730     {
 731       char *filename = g_build_filename (g_get_user_config_dir (),
 732                                          "glib-2.0", "settings", "keyfile",
 733                                          NULL);
 734       kfsb->file = g_file_new_for_path (filename);
 735       g_free (filename);
 736     }
 737
 738   if (kfsb->prefix == NULL)
 739     {
 740       kfsb->prefix = g_strdup ("/");
 741       kfsb->prefix_len = 1;
 742     }
 743
 744   kfsb->keyfile = g_key_file_new ();
 745   kfsb->permission = g_simple_permission_new (TRUE);
 746
 747   kfsb->dir = g_file_get_parent (kfsb->file);
 748   path = g_file_peek_path (kfsb->dir);
 749   if (g_mkdir_with_parents (path, 0700) == -1)
 750     g_warning ("Failed to create %s: %s", path, g_strerror (errno));
 751
 752   kfsb->file_monitor = g_file_monitor (kfsb->file, G_FILE_MONITOR_NONE, NULL, NULL);
 753   kfsb->dir_monitor = g_file_monitor (kfsb->dir, G_FILE_MONITOR_NONE, NULL, NULL);
 754
 755   compute_checksum (kfsb->digest, NULL, 0);
 756
 757   g_signal_connect (kfsb->file_monitor, "changed",
 758                     G_CALLBACK (file_changed), kfsb);
 759   g_signal_connect (kfsb->dir_monitor, "changed",
 760                     G_CALLBACK (dir_changed), kfsb);
 761
 762   g_keyfile_settings_backend_keyfile_writable (kfsb);
 763   g_keyfile_settings_backend_keyfile_reload (kfsb);
 764
 765   load_system_settings (kfsb);
 766 }
 767
 768 static void
 769 g_keyfile_settings_backend_set_property (GObject      *object,
 770                                          guint         prop_id,
 771                                          const GValue *value,
 772                                          GParamSpec   *pspec)
 773 {
 774   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (object);
 775
 776   switch ((GKeyfileSettingsBackendProperty)prop_id)
 777     {
 778     case PROP_FILENAME:
 779       /* Construct only. */
 780       g_assert (kfsb->file == NULL);
 781       if (g_value_get_string (value))
 782         kfsb->file = g_file_new_for_path (g_value_get_string (value));
 783       break;
 784
 785     case PROP_ROOT_PATH:
 786       /* Construct only. */
 787       g_assert (kfsb->prefix == NULL);
 788       kfsb->prefix = g_value_dup_string (value);
 789       if (kfsb->prefix)
 790         kfsb->prefix_len = strlen (kfsb->prefix);
 791       break;
 792
 793     case PROP_ROOT_GROUP:
 794       /* Construct only. */
 795       g_assert (kfsb->root_group == NULL);
 796       kfsb->root_group = g_value_dup_string (value);
 797       if (kfsb->root_group)
 798         kfsb->root_group_len = strlen (kfsb->root_group);
 799       break;
 800
 801     case PROP_DEFAULTS_DIR:
 802       /* Construct only. */
 803       g_assert (kfsb->defaults_dir == NULL);
 804       kfsb->defaults_dir = g_value_dup_string (value);
 805       break;
 806
 807     default:
 808       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 809       break;
 810     }
 811 }
 812
 813 static void
 814 g_keyfile_settings_backend_get_property (GObject    *object,
 815                                          guint       prop_id,
 816                                          GValue     *value,
 817                                          GParamSpec *pspec)
 818 {
 819   GKeyfileSettingsBackend *kfsb = G_KEYFILE_SETTINGS_BACKEND (object);
 820
 821   switch ((GKeyfileSettingsBackendProperty)prop_id)
 822     {
 823     case PROP_FILENAME:
 824       g_value_set_string (value, g_file_peek_path (kfsb->file));
 825       break;
 826
 827     case PROP_ROOT_PATH:
 828       g_value_set_string (value, kfsb->prefix);
 829       break;
 830
 831     case PROP_ROOT_GROUP:
 832       g_value_set_string (value, kfsb->root_group);
 833       break;
 834
 835     case PROP_DEFAULTS_DIR:
 836       g_value_set_string (value, kfsb->defaults_dir);
 837       break;
 838
 839     default:
 840       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 841       break;
 842     }
 843 }
 844
 845 static void
 846 g_keyfile_settings_backend_class_init (GKeyfileSettingsBackendClass *class)
 847 {
 848   GObjectClass *object_class = G_OBJECT_CLASS (class);
 849
 850   object_class->finalize = g_keyfile_settings_backend_finalize;
 851   object_class->constructed = g_keyfile_settings_backend_constructed;
 852   object_class->get_property = g_keyfile_settings_backend_get_property;
 853   object_class->set_property = g_keyfile_settings_backend_set_property;
 854
 855   class->read = g_keyfile_settings_backend_read;
 856   class->write = g_keyfile_settings_backend_write;
 857   class->write_tree = g_keyfile_settings_backend_write_tree;
 858   class->reset = g_keyfile_settings_backend_reset;
 859   class->get_writable = g_keyfile_settings_backend_get_writable;
 860   class->get_permission = g_keyfile_settings_backend_get_permission;
 861   /* No need to implement subscribed/unsubscribe: the only point would be to
 862    * stop monitoring the file when there's no GSettings anymore, which is no
 863    * big win.
 864    */
 865
 866   /**
 867    * GKeyfileSettingsBackend:filename:
 868    *
 869    * The location where the settings are stored on disk.
 870    *
 871    * Defaults to `$XDG_CONFIG_HOME/glib-2.0/settings/keyfile`.
 872    */
 873   g_object_class_install_property (object_class,
 874                                    PROP_FILENAME,
 875                                    g_param_spec_string ("filename",
 876                                                         P_("Filename"),
 877                                                         P_("The filename"),
 878                                                         NULL,
 879                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
 880                                                         G_PARAM_STATIC_STRINGS));
 881
 882   /**
 883    * GKeyfileSettingsBackend:root-path:
 884    *
 885    * All settings read to or written from the backend must fall under the
 886    * path given in @root_path (which must start and end with a slash and
 887    * not contain two consecutive slashes).  @root_path may be "/".
 888    *
 889    * Defaults to "/".
 890    */
 891   g_object_class_install_property (object_class,
 892                                    PROP_ROOT_PATH,
 893                                    g_param_spec_string ("root-path",
 894                                                         P_("Root path"),
 895                                                         P_("The root path"),
 896                                                         NULL,
 897                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
 898                                                         G_PARAM_STATIC_STRINGS));
 899
 900   /**
 901    * GKeyfileSettingsBackend:root-group:
 902    *
 903    * If @root_group is non-%NULL then it specifies the name of the keyfile
 904    * group used for keys that are written directly below the root path.
 905    *
 906    * Defaults to NULL.
 907    */
 908   g_object_class_install_property (object_class,
 909                                    PROP_ROOT_GROUP,
 910                                    g_param_spec_string ("root-group",
 911                                                         P_("Root group"),
 912                                                         P_("The root group"),
 913                                                         NULL,
 914                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
 915                                                         G_PARAM_STATIC_STRINGS));
 916
 917   /**
 918    * GKeyfileSettingsBackend:default-dir:
 919    *
 920    * The directory where the system defaults and locks are located.
 921    *
 922    * Defaults to `/etc/glib-2.0/settings`.
 923    */
 924   g_object_class_install_property (object_class,
 925                                    PROP_DEFAULTS_DIR,
 926                                    g_param_spec_string ("defaults-dir",
 927                                                         P_("Default dir"),
 928                                                         P_("Defaults dir"),
 929                                                         NULL,
 930                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
 931                                                         G_PARAM_STATIC_STRINGS));
 932 }
 933
 934 /**
 935  * g_keyfile_settings_backend_new:
 936  * @filename: the filename of the keyfile
 937  * @root_path: the path under which all settings keys appear
 938  * @root_group: (nullable): the group name corresponding to
 939  *              @root_path, or %NULL
 940  *
 941  * Creates a keyfile-backed #GSettingsBackend.
 942  *
 943  * The filename of the keyfile to use is given by @filename.
 944  *
 945  * All settings read to or written from the backend must fall under the
 946  * path given in @root_path (which must start and end with a slash and
 947  * not contain two consecutive slashes).  @root_path may be "/".
 948  *
 949  * If @root_group is non-%NULL then it specifies the name of the keyfile
 950  * group used for keys that are written directly below @root_path.  For
 951  * example, if @root_path is "/apps/example/" and @root_group is
 952  * "toplevel", then settings the key "/apps/example/enabled" to a value
 953  * of %TRUE will cause the following to appear in the keyfile:
 954  *
 955  * |[
 956  *   [toplevel]
 957  *   enabled=true
 958  * ]|
 959  *
 960  * If @root_group is %NULL then it is not permitted to store keys
 961  * directly below the @root_path.
 962  *
 963  * For keys not stored directly below @root_path (ie: in a sub-path),
 964  * the name of the subpath (with the final slash stripped) is used as
 965  * the name of the keyfile group.  To continue the example, if
 966  * "/apps/example/profiles/default/font-size" were set to
 967  * 12 then the following would appear in the keyfile:
 968  *
 969  * |[
 970  *   [profiles/default]
 971  *   font-size=12
 972  * ]|
 973  *
 974  * The backend will refuse writes (and return writability as being
 975  * %FALSE) for keys outside of @root_path and, in the event that
 976  * @root_group is %NULL, also for keys directly under @root_path.
 977  * Writes will also be refused if the backend detects that it has the
 978  * inability to rewrite the keyfile (ie: the containing directory is not
 979  * writable).
 980  *
 981  * There is no checking done for your key namespace clashing with the
 982  * syntax of the key file format.  For example, if you have '[' or ']'
 983  * characters in your path names or '=' in your key names you may be in
 984  * trouble.
 985  *
 986  * The backend reads default values from a keyfile called `defaults` in
 987  * the directory specified by the #GKeyfileSettingsBackend:defaults-dir property,
 988  * and a list of locked keys from a text file with the name `locks` in
 989  * the same location.
 990  *
 991  * Returns: (transfer full): a keyfile-backed #GSettingsBackend
 992  **/
 993 GSettingsBackend *
 994 g_keyfile_settings_backend_new (const gchar *filename,
 995                                 const gchar *root_path,
 996                                 const gchar *root_group)
 997 {
 998   g_return_val_if_fail (filename != NULL, NULL);
 999   g_return_val_if_fail (root_path != NULL, NULL);
1000   g_return_val_if_fail (g_str_has_prefix (root_path, "/"), NULL);
1001   g_return_val_if_fail (g_str_has_suffix (root_path, "/"), NULL);
1002   g_return_val_if_fail (strstr (root_path, "//") == NULL, NULL);
1003
1004   return G_SETTINGS_BACKEND (g_object_new (G_TYPE_KEYFILE_SETTINGS_BACKEND,
1005                                            "filename", filename,
1006                                            "root-path", root_path,
1007                                            "root-group", root_group,
1008                                            NULL));
1009 }