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