gio/gunixvolumemonitor.c

   1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
   2
   3 /* GIO - GLib Input, Output and Streaming Library
   4  *
   5  * Copyright (C) 2006-2007 Red Hat, Inc.
   6  *
   7  * SPDX-License-Identifier: LGPL-2.1-or-later
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General
  20  * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
  21  *
  22  * Author: Alexander Larsson <alexl@redhat.com>
  23  *         David Zeuthen <davidz@redhat.com>
  24  */
  25
  26 #include "config.h"
  27
  28 #include <string.h>
  29
  30 #include <glib.h>
  31 #include "gunixvolumemonitor.h"
  32 #include "gunixmounts.h"
  33 #include "gunixmount.h"
  34 #include "gunixvolume.h"
  35 #include "gmount.h"
  36 #include "gmountprivate.h"
  37 #include "giomodule.h"
  38 #include "glibintl.h"
  39
  40
  41 struct _GUnixVolumeMonitor {
  42   GNativeVolumeMonitor parent;
  43
  44   GUnixMountMonitor *mount_monitor;
  45
  46   GList *last_mountpoints;
  47   GList *last_mounts;
  48
  49   GList *volumes;
  50   GList *mounts;
  51 };
  52
  53 static void mountpoints_changed      (GUnixMountMonitor  *mount_monitor,
  54                                       gpointer            user_data);
  55 static void mounts_changed           (GUnixMountMonitor  *mount_monitor,
  56                                       gpointer            user_data);
  57 static void update_volumes           (GUnixVolumeMonitor *monitor);
  58 static void update_mounts            (GUnixVolumeMonitor *monitor);
  59
  60 #define g_unix_volume_monitor_get_type _g_unix_volume_monitor_get_type
  61 G_DEFINE_TYPE_WITH_CODE (GUnixVolumeMonitor, g_unix_volume_monitor, G_TYPE_NATIVE_VOLUME_MONITOR,
  62                          g_io_extension_point_implement (G_NATIVE_VOLUME_MONITOR_EXTENSION_POINT_NAME,
  63                                                          g_define_type_id,
  64                                                          "unix",
  65                                                          0));
  66
  67 static void
  68 g_unix_volume_monitor_finalize (GObject *object)
  69 {
  70   GUnixVolumeMonitor *monitor;
  71
  72   monitor = G_UNIX_VOLUME_MONITOR (object);
  73
  74   g_signal_handlers_disconnect_by_func (monitor->mount_monitor, mountpoints_changed, monitor);
  75   g_signal_handlers_disconnect_by_func (monitor->mount_monitor, mounts_changed, monitor);
  76
  77   g_object_unref (monitor->mount_monitor);
  78
  79   g_list_free_full (monitor->last_mountpoints, (GDestroyNotify) g_unix_mount_point_free);
  80   g_list_free_full (monitor->last_mounts, (GDestroyNotify) g_unix_mount_free);
  81
  82   g_list_free_full (monitor->volumes, g_object_unref);
  83   g_list_free_full (monitor->mounts, g_object_unref);
  84
  85   G_OBJECT_CLASS (g_unix_volume_monitor_parent_class)->finalize (object);
  86 }
  87
  88 static void
  89 g_unix_volume_monitor_dispose (GObject *object)
  90 {
  91   GUnixVolumeMonitor *monitor;
  92
  93   monitor = G_UNIX_VOLUME_MONITOR (object);
  94
  95   g_list_free_full (monitor->volumes, g_object_unref);
  96   monitor->volumes = NULL;
  97
  98   g_list_free_full (monitor->mounts, g_object_unref);
  99   monitor->mounts = NULL;
 100
 101   G_OBJECT_CLASS (g_unix_volume_monitor_parent_class)->dispose (object);
 102 }
 103
 104 static GList *
 105 get_mounts (GVolumeMonitor *volume_monitor)
 106 {
 107   GUnixVolumeMonitor *monitor;
 108
 109   monitor = G_UNIX_VOLUME_MONITOR (volume_monitor);
 110
 111   return g_list_copy_deep (monitor->mounts, (GCopyFunc) g_object_ref, NULL);
 112 }
 113
 114 static GList *
 115 get_volumes (GVolumeMonitor *volume_monitor)
 116 {
 117   GUnixVolumeMonitor *monitor;
 118
 119   monitor = G_UNIX_VOLUME_MONITOR (volume_monitor);
 120
 121   return g_list_copy_deep (monitor->volumes, (GCopyFunc) g_object_ref, NULL);
 122 }
 123
 124 static GList *
 125 get_connected_drives (GVolumeMonitor *volume_monitor)
 126 {
 127   return NULL;
 128 }
 129
 130 static GVolume *
 131 get_volume_for_uuid (GVolumeMonitor *volume_monitor, const char *uuid)
 132 {
 133   return NULL;
 134 }
 135
 136 static GMount *
 137 get_mount_for_uuid (GVolumeMonitor *volume_monitor, const char *uuid)
 138 {
 139   return NULL;
 140 }
 141
 142 static gboolean
 143 is_supported (void)
 144 {
 145   return TRUE;
 146 }
 147
 148 static GMount *
 149 get_mount_for_mount_path (const char *mount_path,
 150                           GCancellable *cancellable)
 151 {
 152   GUnixMountEntry *mount_entry;
 153   GUnixMount *mount;
 154
 155   mount_entry = g_unix_mount_at (mount_path, NULL);
 156
 157   if (!mount_entry)
 158     return NULL;
 159
 160   /* TODO: Set mountable volume? */
 161   mount = _g_unix_mount_new (NULL, mount_entry, NULL);
 162
 163   g_unix_mount_free (mount_entry);
 164
 165   return G_MOUNT (mount);
 166 }
 167
 168 static void
 169 g_unix_volume_monitor_class_init (GUnixVolumeMonitorClass *klass)
 170 {
 171   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 172   GVolumeMonitorClass *monitor_class = G_VOLUME_MONITOR_CLASS (klass);
 173   GNativeVolumeMonitorClass *native_class = G_NATIVE_VOLUME_MONITOR_CLASS (klass);
 174
 175   gobject_class->finalize = g_unix_volume_monitor_finalize;
 176   gobject_class->dispose = g_unix_volume_monitor_dispose;
 177
 178   monitor_class->get_mounts = get_mounts;
 179   monitor_class->get_volumes = get_volumes;
 180   monitor_class->get_connected_drives = get_connected_drives;
 181   monitor_class->get_volume_for_uuid = get_volume_for_uuid;
 182   monitor_class->get_mount_for_uuid = get_mount_for_uuid;
 183   monitor_class->is_supported = is_supported;
 184
 185   native_class->get_mount_for_mount_path = get_mount_for_mount_path;
 186 }
 187
 188 void
 189 _g_unix_volume_monitor_update (GUnixVolumeMonitor *unix_monitor)
 190 {
 191   /* Update both to make sure volumes are created before mounts */
 192   update_volumes (unix_monitor);
 193   update_mounts (unix_monitor);
 194 }
 195
 196 static void
 197 mountpoints_changed (GUnixMountMonitor *mount_monitor,
 198                      gpointer           user_data)
 199 {
 200   GUnixVolumeMonitor *unix_monitor = user_data;
 201
 202   _g_unix_volume_monitor_update (unix_monitor);
 203 }
 204
 205 static void
 206 mounts_changed (GUnixMountMonitor *mount_monitor,
 207                 gpointer           user_data)
 208 {
 209   GUnixVolumeMonitor *unix_monitor = user_data;
 210
 211   _g_unix_volume_monitor_update (unix_monitor);
 212 }
 213
 214 static void
 215 g_unix_volume_monitor_init (GUnixVolumeMonitor *unix_monitor)
 216 {
 217
 218   unix_monitor->mount_monitor = g_unix_mount_monitor_get ();
 219
 220   g_signal_connect (unix_monitor->mount_monitor,
 221                     "mounts-changed", G_CALLBACK (mounts_changed),
 222                     unix_monitor);
 223
 224   g_signal_connect (unix_monitor->mount_monitor,
 225                     "mountpoints-changed", G_CALLBACK (mountpoints_changed),
 226                     unix_monitor);
 227
 228   _g_unix_volume_monitor_update (unix_monitor);
 229 }
 230
 231 GVolumeMonitor *
 232 _g_unix_volume_monitor_new (void)
 233 {
 234   GUnixVolumeMonitor *monitor;
 235
 236   monitor = g_object_new (G_TYPE_UNIX_VOLUME_MONITOR, NULL);
 237
 238   return G_VOLUME_MONITOR (monitor);
 239 }
 240
 241 static void
 242 diff_sorted_lists (GList         *list1,
 243                    GList         *list2,
 244                    GCompareFunc   compare,
 245                    GList        **added,
 246                    GList        **removed)
 247 {
 248   int order;
 249
 250   *added = *removed = NULL;
 251
 252   while (list1 != NULL &&
 253          list2 != NULL)
 254     {
 255       order = (*compare) (list1->data, list2->data);
 256       if (order < 0)
 257         {
 258           *removed = g_list_prepend (*removed, list1->data);
 259           list1 = list1->next;
 260         }
 261       else if (order > 0)
 262         {
 263           *added = g_list_prepend (*added, list2->data);
 264           list2 = list2->next;
 265         }
 266       else
 267         { /* same item */
 268           list1 = list1->next;
 269           list2 = list2->next;
 270         }
 271     }
 272
 273   while (list1 != NULL)
 274     {
 275       *removed = g_list_prepend (*removed, list1->data);
 276       list1 = list1->next;
 277     }
 278   while (list2 != NULL)
 279     {
 280       *added = g_list_prepend (*added, list2->data);
 281       list2 = list2->next;
 282     }
 283 }
 284
 285 GUnixVolume *
 286 _g_unix_volume_monitor_lookup_volume_for_mount_path (GUnixVolumeMonitor *monitor,
 287                                                      const char         *mount_path)
 288 {
 289   GList *l;
 290
 291   for (l = monitor->volumes; l != NULL; l = l->next)
 292     {
 293       GUnixVolume *volume = l->data;
 294
 295       if (_g_unix_volume_has_mount_path (volume, mount_path))
 296         return volume;
 297     }
 298
 299   return NULL;
 300 }
 301
 302 static GUnixMount *
 303 find_mount_by_mountpath (GUnixVolumeMonitor *monitor,
 304                          const char *mount_path)
 305 {
 306   GList *l;
 307
 308   for (l = monitor->mounts; l != NULL; l = l->next)
 309     {
 310       GUnixMount *mount = l->data;
 311
 312       if (_g_unix_mount_has_mount_path (mount, mount_path))
 313         return mount;
 314     }
 315
 316   return NULL;
 317 }
 318
 319 static void
 320 update_volumes (GUnixVolumeMonitor *monitor)
 321 {
 322   GList *new_mountpoints;
 323   GList *removed, *added;
 324   GList *l;
 325   GUnixVolume *volume;
 326
 327   new_mountpoints = g_unix_mount_points_get (NULL);
 328
 329   new_mountpoints = g_list_sort (new_mountpoints, (GCompareFunc) g_unix_mount_point_compare);
 330
 331   diff_sorted_lists (monitor->last_mountpoints,
 332                      new_mountpoints, (GCompareFunc) g_unix_mount_point_compare,
 333                      &added, &removed);
 334
 335   for (l = removed; l != NULL; l = l->next)
 336     {
 337       GUnixMountPoint *mountpoint = l->data;
 338
 339       volume = _g_unix_volume_monitor_lookup_volume_for_mount_path (monitor,
 340                                                                     g_unix_mount_point_get_mount_path (mountpoint));
 341       if (volume)
 342         {
 343           _g_unix_volume_disconnected (volume);
 344           monitor->volumes = g_list_remove (monitor->volumes, volume);
 345           g_signal_emit_by_name (monitor, "volume-removed", volume);
 346           g_signal_emit_by_name (volume, "removed");
 347           g_object_unref (volume);
 348         }
 349     }
 350
 351   for (l = added; l != NULL; l = l->next)
 352     {
 353       GUnixMountPoint *mountpoint = l->data;
 354
 355       volume = _g_unix_volume_new (G_VOLUME_MONITOR (monitor), mountpoint);
 356       if (volume)
 357         {
 358           monitor->volumes = g_list_prepend (monitor->volumes, volume);
 359           g_signal_emit_by_name (monitor, "volume-added", volume);
 360         }
 361     }
 362
 363   g_list_free (added);
 364   g_list_free (removed);
 365   g_list_free_full (monitor->last_mountpoints, (GDestroyNotify) g_unix_mount_point_free);
 366   monitor->last_mountpoints = new_mountpoints;
 367 }
 368
 369 static void
 370 update_mounts (GUnixVolumeMonitor *monitor)
 371 {
 372   GList *new_mounts;
 373   GList *removed, *added;
 374   GList *l;
 375   GUnixMount *mount;
 376   GUnixVolume *volume;
 377   const char *mount_path;
 378
 379   new_mounts = g_unix_mounts_get (NULL);
 380
 381   new_mounts = g_list_sort (new_mounts, (GCompareFunc) g_unix_mount_compare);
 382
 383   diff_sorted_lists (monitor->last_mounts,
 384                      new_mounts, (GCompareFunc) g_unix_mount_compare,
 385                      &added, &removed);
 386
 387   for (l = removed; l != NULL; l = l->next)
 388     {
 389       GUnixMountEntry *mount_entry = l->data;
 390
 391       mount = find_mount_by_mountpath (monitor, g_unix_mount_get_mount_path (mount_entry));
 392       if (mount)
 393         {
 394           _g_unix_mount_unmounted (mount);
 395           monitor->mounts = g_list_remove (monitor->mounts, mount);
 396           g_signal_emit_by_name (monitor, "mount-removed", mount);
 397           g_signal_emit_by_name (mount, "unmounted");
 398           g_object_unref (mount);
 399         }
 400     }
 401
 402   for (l = added; l != NULL; l = l->next)
 403     {
 404       GUnixMountEntry *mount_entry = l->data;
 405
 406       mount_path = g_unix_mount_get_mount_path (mount_entry);
 407
 408       volume = _g_unix_volume_monitor_lookup_volume_for_mount_path (monitor, mount_path);
 409       mount = _g_unix_mount_new (G_VOLUME_MONITOR (monitor), mount_entry, volume);
 410       if (mount)
 411         {
 412           monitor->mounts = g_list_prepend (monitor->mounts, mount);
 413           g_signal_emit_by_name (monitor, "mount-added", mount);
 414         }
 415     }
 416
 417   g_list_free (added);
 418   g_list_free (removed);
 419   g_list_free_full (monitor->last_mounts, (GDestroyNotify) g_unix_mount_free);
 420   monitor->last_mounts = new_mounts;
 421 }