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  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General
  18  * Public License along with this library; if not, write to the
  19  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  20  * Boston, MA 02111-1307, USA.
  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 "gmountprivate.h"
  36 #include "glibintl.h"
  37
  38 #include "gioalias.h"
  39
  40 struct _GUnixVolumeMonitor {
  41   GNativeVolumeMonitor parent;
  42
  43   GUnixMountMonitor *mount_monitor;
  44
  45   GList *last_mountpoints;
  46   GList *last_mounts;
  47
  48   GList *volumes;
  49   GList *mounts;
  50 };
  51
  52 static void mountpoints_changed      (GUnixMountMonitor  *mount_monitor,
  53                                       gpointer            user_data);
  54 static void mounts_changed           (GUnixMountMonitor  *mount_monitor,
  55                                       gpointer            user_data);
  56 static void update_volumes           (GUnixVolumeMonitor *monitor);
  57 static void update_mounts            (GUnixVolumeMonitor *monitor);
  58
  59 #define g_unix_volume_monitor_get_type _g_unix_volume_monitor_get_type
  60 G_DEFINE_TYPE_WITH_CODE (GUnixVolumeMonitor, g_unix_volume_monitor, G_TYPE_NATIVE_VOLUME_MONITOR,
  61                          g_io_extension_point_implement (G_NATIVE_VOLUME_MONITOR_EXTENSION_POINT_NAME,
  62                                                          g_define_type_id,
  63                                                          "unix",
  64                                                          0));
  65
  66 static void
  67 g_unix_volume_monitor_finalize (GObject *object)
  68 {
  69   GUnixVolumeMonitor *monitor;
  70
  71   monitor = G_UNIX_VOLUME_MONITOR (object);
  72
  73   g_signal_handlers_disconnect_by_func (monitor->mount_monitor, mountpoints_changed, monitor);
  74   g_signal_handlers_disconnect_by_func (monitor->mount_monitor, mounts_changed, monitor);
  75
  76   g_object_unref (monitor->mount_monitor);
  77
  78   g_list_foreach (monitor->last_mountpoints, (GFunc)g_unix_mount_point_free, NULL);
  79   g_list_free (monitor->last_mountpoints);
  80   g_list_foreach (monitor->last_mounts, (GFunc)g_unix_mount_free, NULL);
  81   g_list_free (monitor->last_mounts);
  82
  83   g_list_foreach (monitor->volumes, (GFunc)g_object_unref, NULL);
  84   g_list_free (monitor->volumes);
  85   g_list_foreach (monitor->mounts, (GFunc)g_object_unref, NULL);
  86   g_list_free (monitor->mounts);
  87
  88   G_OBJECT_CLASS (g_unix_volume_monitor_parent_class)->finalize (object);
  89 }
  90
  91 static GList *
  92 get_mounts (GVolumeMonitor *volume_monitor)
  93 {
  94   GUnixVolumeMonitor *monitor;
  95   GList *l;
  96
  97   monitor = G_UNIX_VOLUME_MONITOR (volume_monitor);
  98
  99   l = g_list_copy (monitor->mounts);
 100   g_list_foreach (l, (GFunc)g_object_ref, NULL);
 101
 102   return l;
 103 }
 104
 105 static GList *
 106 get_volumes (GVolumeMonitor *volume_monitor)
 107 {
 108   GUnixVolumeMonitor *monitor;
 109   GList *l;
 110
 111   monitor = G_UNIX_VOLUME_MONITOR (volume_monitor);
 112
 113   l = g_list_copy (monitor->volumes);
 114   g_list_foreach (l, (GFunc)g_object_ref, NULL);
 115
 116   return l;
 117 }
 118
 119 static GList *
 120 get_connected_drives (GVolumeMonitor *volume_monitor)
 121 {
 122   return NULL;
 123 }
 124
 125 static GVolume *
 126 get_volume_for_uuid (GVolumeMonitor *volume_monitor, const char *uuid)
 127 {
 128   return NULL;
 129 }
 130
 131 static GMount *
 132 get_mount_for_uuid (GVolumeMonitor *volume_monitor, const char *uuid)
 133 {
 134   return NULL;
 135 }
 136
 137 static gboolean
 138 is_supported (void)
 139 {
 140   return TRUE;
 141 }
 142
 143 static GMount *
 144 get_mount_for_mount_path (const char *mount_path,
 145                           GCancellable *cancellable)
 146 {
 147   GUnixMountEntry *mount_entry;
 148   GUnixMount *mount;
 149
 150   mount_entry = g_unix_mount_at (mount_path, NULL);
 151
 152   /* TODO: Set mountable volume? */
 153   mount = _g_unix_mount_new (NULL, mount_entry, NULL);
 154
 155   return G_MOUNT (mount);
 156 }
 157
 158 static void
 159 g_unix_volume_monitor_class_init (GUnixVolumeMonitorClass *klass)
 160 {
 161   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 162   GVolumeMonitorClass *monitor_class = G_VOLUME_MONITOR_CLASS (klass);
 163   GNativeVolumeMonitorClass *native_class = G_NATIVE_VOLUME_MONITOR_CLASS (klass);
 164
 165   gobject_class->finalize = g_unix_volume_monitor_finalize;
 166
 167   monitor_class->get_mounts = get_mounts;
 168   monitor_class->get_volumes = get_volumes;
 169   monitor_class->get_connected_drives = get_connected_drives;
 170   monitor_class->get_volume_for_uuid = get_volume_for_uuid;
 171   monitor_class->get_mount_for_uuid = get_mount_for_uuid;
 172   monitor_class->is_supported = is_supported;
 173
 174   native_class->get_mount_for_mount_path = get_mount_for_mount_path;
 175 }
 176
 177 static void
 178 mountpoints_changed (GUnixMountMonitor *mount_monitor,
 179                      gpointer           user_data)
 180 {
 181   GUnixVolumeMonitor *unix_monitor = user_data;
 182
 183   /* Update both to make sure volumes are created before mounts */
 184   update_volumes (unix_monitor);
 185   update_mounts (unix_monitor);
 186 }
 187
 188 static void
 189 mounts_changed (GUnixMountMonitor *mount_monitor,
 190                 gpointer           user_data)
 191 {
 192   GUnixVolumeMonitor *unix_monitor = user_data;
 193
 194   /* Update both to make sure volumes are created before mounts */
 195   update_volumes (unix_monitor);
 196   update_mounts (unix_monitor);
 197 }
 198
 199 static void
 200 g_unix_volume_monitor_init (GUnixVolumeMonitor *unix_monitor)
 201 {
 202
 203   unix_monitor->mount_monitor = g_unix_mount_monitor_new ();
 204
 205   g_signal_connect (unix_monitor->mount_monitor,
 206                     "mounts_changed", G_CALLBACK (mounts_changed),
 207                     unix_monitor);
 208
 209   g_signal_connect (unix_monitor->mount_monitor,
 210                     "mountpoints_changed", G_CALLBACK (mountpoints_changed),
 211                     unix_monitor);
 212
 213   update_volumes (unix_monitor);
 214   update_mounts (unix_monitor);
 215 }
 216
 217 /**
 218  * g_unix_volume_monitor_new:
 219  *
 220  * Returns:  a new #GVolumeMonitor.
 221  **/
 222 GVolumeMonitor *
 223 _g_unix_volume_monitor_new (void)
 224 {
 225   GUnixVolumeMonitor *monitor;
 226
 227   monitor = g_object_new (G_TYPE_UNIX_VOLUME_MONITOR, NULL);
 228
 229   return G_VOLUME_MONITOR (monitor);
 230 }
 231
 232 static void
 233 diff_sorted_lists (GList         *list1,
 234                    GList         *list2,
 235                    GCompareFunc   compare,
 236                    GList        **added,
 237                    GList        **removed)
 238 {
 239   int order;
 240
 241   *added = *removed = NULL;
 242
 243   while (list1 != NULL &&
 244          list2 != NULL)
 245     {
 246       order = (*compare) (list1->data, list2->data);
 247       if (order < 0)
 248         {
 249           *removed = g_list_prepend (*removed, list1->data);
 250           list1 = list1->next;
 251         }
 252       else if (order > 0)
 253         {
 254           *added = g_list_prepend (*added, list2->data);
 255           list2 = list2->next;
 256         }
 257       else
 258         { /* same item */
 259           list1 = list1->next;
 260           list2 = list2->next;
 261         }
 262     }
 263
 264   while (list1 != NULL)
 265     {
 266       *removed = g_list_prepend (*removed, list1->data);
 267       list1 = list1->next;
 268     }
 269   while (list2 != NULL)
 270     {
 271       *added = g_list_prepend (*added, list2->data);
 272       list2 = list2->next;
 273     }
 274 }
 275
 276 /**
 277  * _g_unix_volume_monitor_lookup_volume_for_mount_path:
 278  * @monitor:
 279  * @mount_path:
 280  *
 281  * Returns:  #GUnixVolume for the given @mount_path.
 282  **/
 283 GUnixVolume *
 284 _g_unix_volume_monitor_lookup_volume_for_mount_path (GUnixVolumeMonitor *monitor,
 285                                                      const char         *mount_path)
 286 {
 287   GList *l;
 288
 289   for (l = monitor->volumes; l != NULL; l = l->next)
 290     {
 291       GUnixVolume *volume = l->data;
 292
 293       if (_g_unix_volume_has_mount_path (volume, mount_path))
 294         return volume;
 295     }
 296
 297   return NULL;
 298 }
 299
 300 static GUnixMount *
 301 find_mount_by_mountpath (GUnixVolumeMonitor *monitor,
 302                          const char *mount_path)
 303 {
 304   GList *l;
 305
 306   for (l = monitor->mounts; l != NULL; l = l->next)
 307     {
 308       GUnixMount *mount = l->data;
 309
 310       if (_g_unix_mount_has_mount_path (mount, mount_path))
 311         return mount;
 312     }
 313
 314   return NULL;
 315 }
 316
 317 static void
 318 update_volumes (GUnixVolumeMonitor *monitor)
 319 {
 320   GList *new_mountpoints;
 321   GList *removed, *added;
 322   GList *l;
 323   GUnixVolume *volume;
 324
 325   new_mountpoints = g_unix_mount_points_get (NULL);
 326
 327   new_mountpoints = g_list_sort (new_mountpoints, (GCompareFunc) g_unix_mount_point_compare);
 328
 329   diff_sorted_lists (monitor->last_mountpoints,
 330                      new_mountpoints, (GCompareFunc) g_unix_mount_point_compare,
 331                      &added, &removed);
 332
 333   for (l = removed; l != NULL; l = l->next)
 334     {
 335       GUnixMountPoint *mountpoint = l->data;
 336
 337       volume = _g_unix_volume_monitor_lookup_volume_for_mount_path (monitor,
 338                                                                     g_unix_mount_point_get_mount_path (mountpoint));
 339       if (volume)
 340         {
 341           _g_unix_volume_disconnected (volume);
 342           monitor->volumes = g_list_remove (monitor->volumes, volume);
 343           g_signal_emit_by_name (monitor, "volume_removed", volume);
 344           g_signal_emit_by_name (volume, "removed");
 345           g_object_unref (volume);
 346         }
 347     }
 348
 349   for (l = added; l != NULL; l = l->next)
 350     {
 351       GUnixMountPoint *mountpoint = l->data;
 352
 353       volume = _g_unix_volume_new (G_VOLUME_MONITOR (monitor), mountpoint);
 354       if (volume)
 355         {
 356           monitor->volumes = g_list_prepend (monitor->volumes, volume);
 357           g_signal_emit_by_name (monitor, "volume_added", volume);
 358         }
 359     }
 360
 361   g_list_free (added);
 362   g_list_free (removed);
 363   g_list_foreach (monitor->last_mountpoints,
 364                   (GFunc)g_unix_mount_point_free, NULL);
 365   g_list_free (monitor->last_mountpoints);
 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_foreach (monitor->last_mounts,
 420                   (GFunc)g_unix_mount_free, NULL);
 421   g_list_free (monitor->last_mounts);
 422   monitor->last_mounts = new_mounts;
 423 }