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[gvfs/mtp-backend: 11/64] MTP: Initial MTP volume monitor implementation.

commit e660be080ce67a10c962ad416e215b71f575e820
Author: Philip Langdale <philipl overt org>
Date:   Sat Aug 4 16:54:26 2012 -0700

    MTP: Initial MTP volume monitor implementation.

 configure.ac                                       |    1 +
 monitor/Makefile.am                                |    4 +-
 monitor/mtp/Makefile.am                            |   51 +++
 monitor/mtp/gmtpvolume.c                           |  453 ++++++++++++++++++++
 monitor/mtp/gmtpvolume.h                           |   60 +++
 monitor/mtp/gmtpvolumemonitor.c                    |  342 +++++++++++++++
 monitor/mtp/gmtpvolumemonitor.h                    |   54 +++
 monitor/mtp/mtp-volume-monitor-daemon.c            |   41 ++
 monitor/mtp/mtp.monitor                            |    4 +
 .../org.gtk.Private.MTPVolumeMonitor.service.in    |    3 +
 10 files changed, 1011 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index cef1454..b8cc55c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -827,6 +827,7 @@ monitor/gdu/Makefile
 monitor/udisks2/Makefile
 monitor/gphoto2/Makefile
 monitor/afc/Makefile
+monitor/mtp/Makefile
 programs/Makefile
 man/Makefile
 test/Makefile
diff --git a/monitor/Makefile.am b/monitor/Makefile.am
index d903df1..9bf4e8d 100644
--- a/monitor/Makefile.am
+++ b/monitor/Makefile.am
@@ -1,5 +1,5 @@
-DIST_SUBDIRS = proxy hal gdu gphoto2 afc udisks2
-SUBDIRS = proxy
+DIST_SUBDIRS = proxy hal gdu gphoto2 afc udisks2 mtp
+SUBDIRS = proxy mtp
 
 if USE_HAL
 SUBDIRS += hal
diff --git a/monitor/mtp/Makefile.am b/monitor/mtp/Makefile.am
new file mode 100644
index 0000000..2f585c6
--- /dev/null
+++ b/monitor/mtp/Makefile.am
@@ -0,0 +1,51 @@
+
+NULL =
+
+libexec_PROGRAMS = gvfs-mtp-volume-monitor
+
+gvfs_mtp_volume_monitor_SOURCES =
+
+gvfs_mtp_volume_monitor_SOURCES +=			\
+        mtp-volume-monitor-daemon.c \
+	gmtpvolume.c	gmtpvolume.h	\
+	gmtpvolumemonitor.c	gmtpvolumemonitor.h	\
+	$(NULL)
+
+gvfs_mtp_volume_monitor_CFLAGS =		\
+	-DG_LOG_DOMAIN=\"GVFS-MTP\"		\
+	-I$(top_srcdir)/common                  \
+	-I$(top_srcdir)/monitor/proxy           \
+	$(GLIB_CFLAGS)                          \
+	-DGIO_MODULE_DIR=\"$(GIO_MODULE_DIR)\"	\
+	-DGVFS_LOCALEDIR=\""$(localedir)"\"	\
+	-DG_UDEV_API_IS_SUBJECT_TO_CHANGE	\
+	$(NULL)
+
+gvfs_mtp_volume_monitor_CFLAGS += $(GUDEV_CFLAGS)
+
+gvfs_mtp_volume_monitor_LDFLAGS =	\
+	$(NULL)
+
+gvfs_mtp_volume_monitor_LDADD  =		     			      \
+	$(GLIB_LIBS)                                 			      \
+	$(top_builddir)/common/libgvfscommon.la 			      \
+	$(top_builddir)/monitor/proxy/libgvfsproxyvolumemonitordaemon-noin.la \
+	$(NULL)
+
+gvfs_mtp_volume_monitor_LDADD += $(GUDEV_LIBS)
+
+
+remote_volume_monitorsdir = $(datadir)/gvfs/remote-volume-monitors
+remote_volume_monitors_DATA = mtp.monitor
+
+servicedir       = $(datadir)/dbus-1/services
+service_in_files = org.gtk.Private.MTPVolumeMonitor.service.in
+service_DATA     = $(service_in_files:.service.in=.service)
+
+$(service_DATA): $(service_in_files) Makefile
+	$(AM_V_GEN) $(SED) -e "s|\ libexecdir\@|$(libexecdir)|" $< > $@
+
+clean-local:
+	rm -f *~ *.loT $(service_DATA)
+
+EXTRA_DIST = $(service_in_files) mtp.monitor
diff --git a/monitor/mtp/gmtpvolume.c b/monitor/mtp/gmtpvolume.c
new file mode 100644
index 0000000..2bb87aa
--- /dev/null
+++ b/monitor/mtp/gmtpvolume.c
@@ -0,0 +1,453 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/* GIO - GLib Input, Output and Streaming Library
+ *
+ * Copyright (C) 2006-2007 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Author: David Zeuthen <davidz redhat com>
+ */
+
+#include <config.h>
+
+#include <string.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include <glib.h>
+#include <glib/gi18n-lib.h>
+#include <gio/gio.h>
+
+#include "gmtpvolume.h"
+
+#ifndef HAVE_GUDEV
+#include "hal-utils.h"
+#endif
+
+/* Protects all fields of GHalDrive that can change */
+G_LOCK_DEFINE_STATIC(mtp_volume);
+
+struct _GMtpVolume {
+  GObject parent;
+
+  GVolumeMonitor *volume_monitor; /* owned by volume monitor */
+
+  char *device_path;
+  GUdevDevice *device;
+
+  GFile *activation_root;
+
+  char *name;
+  char *icon;
+};
+
+static void g_mtp_volume_volume_iface_init (GVolumeIface *iface);
+
+G_DEFINE_TYPE_EXTENDED (GMtpVolume, g_mtp_volume, G_TYPE_OBJECT, 0,
+                        G_IMPLEMENT_INTERFACE (G_TYPE_VOLUME,
+                                               g_mtp_volume_volume_iface_init))
+
+static void
+g_mtp_volume_finalize (GObject *object)
+{
+  GMtpVolume *volume;
+
+  volume = G_MTP_VOLUME (object);
+
+  if (volume->device != NULL)
+    g_object_unref (volume->device);
+
+  if (volume->activation_root != NULL)
+    g_object_unref (volume->activation_root);
+
+  if (volume->volume_monitor != NULL)
+    g_object_remove_weak_pointer (G_OBJECT (volume->volume_monitor), (gpointer) &(volume->volume_monitor));
+
+  g_free (volume->name);
+  g_free (volume->icon);
+
+  if (G_OBJECT_CLASS (g_mtp_volume_parent_class)->finalize)
+    (*G_OBJECT_CLASS (g_mtp_volume_parent_class)->finalize) (object);
+}
+
+static void
+g_mtp_volume_class_init (GMtpVolumeClass *klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+
+  gobject_class->finalize = g_mtp_volume_finalize;
+}
+
+static void
+g_mtp_volume_init (GMtpVolume *mtp_volume)
+{
+}
+
+static int hexdigit(char c)
+{
+  if (c >= 'a')
+      return c - 'a' + 10;
+  if (c >= 'A')
+     return c - 'A' + 10;
+  g_return_val_if_fail (c >= '0' && c <= '9', 0);
+  return c - '0';
+}
+
+/* Do not free result, it's a static buffer */
+static const char*
+udev_decode_string (const char* encoded)
+{
+  static char decoded[4096];
+  int len;
+  const char* s;
+
+  if (encoded == NULL)
+      return NULL;
+
+  for (len = 0, s = encoded; *s && len < sizeof(decoded)-1; ++len, ++s)
+    {
+      /* need to check for NUL terminator in advance */
+      if (s[0] == '\\' && s[1] == 'x' && s[2] >= '0' && s[3] >= '0')
+	{
+	  decoded[len] = (hexdigit(s[2]) << 4) | hexdigit(s[3]);
+	  s += 3;
+	}
+      else
+	  decoded[len] = *s;
+    }
+  decoded[len] = '\0';
+  return decoded;
+}
+
+static void
+set_volume_name (GMtpVolume *v)
+{
+  const char *gphoto_name;
+  const char *product = NULL;
+  const char *vendor;
+  const char *model;
+
+  /* our preference: ID_MTP > ID_MEDIA_PLAYER_{VENDOR,PRODUCT} > product >
+   * ID_{VENDOR,MODEL} */
+
+  gphoto_name = g_udev_device_get_property (v->device, "ID_MTP");
+  if (gphoto_name != NULL && strcmp (gphoto_name, "1") != 0)
+    {
+      v->name = g_strdup (gphoto_name);
+      return;
+    }
+
+  vendor = g_udev_device_get_property (v->device, "ID_MEDIA_PLAYER_VENDOR");
+  if (vendor == NULL)
+      vendor = g_udev_device_get_property (v->device, "ID_VENDOR_ENC");
+  model = g_udev_device_get_property (v->device, "ID_MEDIA_PLAYER_MODEL");
+  if (model == NULL)
+    {
+      model = g_udev_device_get_property (v->device, "ID_MODEL_ENC");
+      product = g_udev_device_get_sysfs_attr (v->device, "product");
+    }
+
+  v->name = NULL;
+  if (product != NULL && strlen (product) > 0)
+    v->name = g_strdup (product);
+  else if (vendor == NULL)
+    {
+      if (model != NULL)
+        v->name = g_strdup (udev_decode_string (model));
+    }
+  else
+    {
+      if (model != NULL)
+	{
+	  /* we can't call udev_decode_string() twice in one g_strdup_printf(),
+	   * it returns a static buffer */
+	  gchar *temp = g_strdup_printf ("%s %s", vendor, model);
+          v->name = g_strdup (udev_decode_string (temp));
+	  g_free (temp);
+        }
+      else
+        {
+          if (g_udev_device_has_property (v->device, "ID_MEDIA_PLAYER"))
+            {
+              /* Translators: %s is the device vendor */
+              v->name = g_strdup_printf (_("%s Audio Player"), udev_decode_string (vendor));
+	    }
+	  else
+	    {
+	      /* Translators: %s is the device vendor */
+	      v->name = g_strdup_printf (_("%s Camera"), udev_decode_string (vendor));
+	    }
+        }
+    }
+
+  if (v->name == NULL)
+      v->name = g_strdup (_("Camera"));
+}
+
+static void
+set_volume_icon (GMtpVolume *volume)
+{
+  if (g_udev_device_has_property (volume->device, "ID_MEDIA_PLAYER_ICON_NAME"))
+      volume->icon = g_strdup (g_udev_device_get_property (volume->device, "ID_MEDIA_PLAYER_ICON_NAME"));
+  else if (g_udev_device_has_property (volume->device, "ID_MEDIA_PLAYER"))
+      volume->icon = g_strdup ("multimedia-player");
+  else
+      volume->icon = g_strdup ("camera-photo");
+}
+
+GMtpVolume *
+g_mtp_volume_new (GVolumeMonitor   *volume_monitor,
+                      GUdevDevice      *device,
+                      GUdevClient      *gudev_client,
+                      GFile            *activation_root)
+{
+  GMtpVolume *volume;
+  const char *device_path;
+
+  g_return_val_if_fail (volume_monitor != NULL, NULL);
+  g_return_val_if_fail (device != NULL, NULL);
+  g_return_val_if_fail (gudev_client != NULL, NULL);
+  g_return_val_if_fail (activation_root != NULL, NULL);
+
+  if (!g_udev_device_has_property (device, "ID_MTP_DEVICE"))
+      return NULL;
+  device_path = g_udev_device_get_device_file (device);
+
+  volume = g_object_new (G_TYPE_MTP_VOLUME, NULL);
+  volume->volume_monitor = volume_monitor;
+  g_object_add_weak_pointer (G_OBJECT (volume_monitor), (gpointer) &(volume->volume_monitor));
+  volume->device_path = g_strdup (device_path);
+  volume->device = g_object_ref (device);
+  volume->activation_root = g_object_ref (activation_root);
+
+  set_volume_name (volume);
+  set_volume_icon (volume);
+  /* we do not really need to listen for changes */
+
+  return volume;
+}
+
+void
+g_mtp_volume_removed (GMtpVolume *volume)
+{
+}
+
+static GIcon *
+g_mtp_volume_get_icon (GVolume *volume)
+{
+  GMtpVolume *mtp_volume = G_MTP_VOLUME (volume);
+  GIcon *icon;
+
+  G_LOCK (mtp_volume);
+  icon = g_themed_icon_new (mtp_volume->icon);
+  G_UNLOCK (mtp_volume);
+  return icon;
+}
+
+static char *
+g_mtp_volume_get_name (GVolume *volume)
+{
+  GMtpVolume *mtp_volume = G_MTP_VOLUME (volume);
+  char *name;
+
+  G_LOCK (mtp_volume);
+  name = g_strdup (mtp_volume->name);
+  G_UNLOCK (mtp_volume);
+
+  return name;
+}
+
+static char *
+g_mtp_volume_get_uuid (GVolume *volume)
+{
+  return NULL;
+}
+
+static gboolean
+g_mtp_volume_can_mount (GVolume *volume)
+{
+  return TRUE;
+}
+
+static gboolean
+g_mtp_volume_can_eject (GVolume *volume)
+{
+  return FALSE;
+}
+
+static gboolean
+g_mtp_volume_should_automount (GVolume *volume)
+{
+  return TRUE;
+}
+
+static GDrive *
+g_mtp_volume_get_drive (GVolume *volume)
+{
+  return NULL;
+}
+
+static GMount *
+g_mtp_volume_get_mount (GVolume *volume)
+{
+  return NULL;
+}
+
+gboolean
+g_mtp_volume_has_path (GMtpVolume  *volume,
+                      const char  *sysfs_path)
+{
+  GMtpVolume *mtp_volume = G_MTP_VOLUME (volume);
+  gboolean res;
+
+  G_LOCK (mtp_volume);
+  res = FALSE;
+  if (mtp_volume->device != NULL)
+    res = strcmp (g_udev_device_get_sysfs_path   (mtp_volume->device), sysfs_path) == 0;
+  G_UNLOCK (mtp_volume);
+  return res;
+}
+
+typedef struct
+{
+  GMtpVolume *enclosing_volume;
+  GAsyncReadyCallback  callback;
+  gpointer user_data;
+} ActivationMountOp;
+
+static void
+mount_callback (GObject *source_object,
+                        GAsyncResult *res,
+                        gpointer user_data)
+{
+  ActivationMountOp *data = user_data;
+  data->callback (G_OBJECT (data->enclosing_volume), res, data->user_data);
+  g_free (data);
+}
+
+static void
+g_mtp_volume_mount (GVolume             *volume,
+                        GMountMountFlags     flags,
+                        GMountOperation     *mount_operation,
+                        GCancellable        *cancellable,
+                        GAsyncReadyCallback  callback,
+                        gpointer             user_data)
+{
+  GMtpVolume *mtp_volume = G_MTP_VOLUME (volume);
+  ActivationMountOp *data;
+
+  /*g_warning ("mtp_volume_mount (can_mount=%d foreign=%p device_path=%s)",
+              g_mtp_volume_can_mount (volume),
+              mtp_volume->activation_root,
+              mtp_volume->device_path);*/
+
+  G_LOCK (mtp_volume);
+
+  data = g_new0 (ActivationMountOp, 1);
+  data->enclosing_volume = mtp_volume;
+  data->callback = callback;
+  data->user_data = user_data;
+
+  g_file_mount_enclosing_volume (mtp_volume->activation_root,
+                                 0,
+                                 mount_operation,
+                                 cancellable,
+                                 mount_callback,
+                                 data);
+
+  G_UNLOCK (mtp_volume);
+}
+
+static gboolean
+g_mtp_volume_mount_finish (GVolume       *volume,
+                           GAsyncResult  *result,
+                           GError       **error)
+{
+  GMtpVolume *mtp_volume = G_MTP_VOLUME (volume);
+  gboolean res;
+
+  G_LOCK (mtp_volume);
+  res = g_file_mount_enclosing_volume_finish (mtp_volume->activation_root, result, error);
+  G_UNLOCK (mtp_volume);
+
+  return res;
+}
+
+static char *
+g_mtp_volume_get_identifier (GVolume              *volume,
+                             const char          *kind)
+{
+  GMtpVolume *mtp_volume = G_MTP_VOLUME (volume);
+  char *id;
+
+  G_LOCK (mtp_volume);
+  id = NULL;
+    if (strcmp (kind, G_VOLUME_IDENTIFIER_KIND_UNIX_DEVICE) == 0)
+    id = g_strdup (mtp_volume->device_path);
+  G_UNLOCK (mtp_volume);
+
+  return id;
+}
+
+static char **
+g_mtp_volume_enumerate_identifiers (GVolume *volume)
+{
+  GMtpVolume *mtp_volume = G_MTP_VOLUME (volume);
+  GPtrArray *res;
+
+  G_LOCK (mtp_volume);
+
+  res = g_ptr_array_new ();
+
+  if (mtp_volume->device_path && *mtp_volume->device_path != 0)
+    g_ptr_array_add (res,
+                     g_strdup (G_VOLUME_IDENTIFIER_KIND_UNIX_DEVICE));
+
+  /* Null-terminate */
+  g_ptr_array_add (res, NULL);
+
+  G_UNLOCK (mtp_volume);
+
+  return (char **)g_ptr_array_free (res, FALSE);
+}
+
+static GFile *
+g_mtp_volume_get_activation_root (GVolume *volume)
+{
+  GMtpVolume *mtp_volume = G_MTP_VOLUME (volume);
+
+  return g_object_ref (mtp_volume->activation_root);
+}
+
+static void
+g_mtp_volume_volume_iface_init (GVolumeIface *iface)
+{
+  iface->get_name = g_mtp_volume_get_name;
+  iface->get_icon = g_mtp_volume_get_icon;
+  iface->get_uuid = g_mtp_volume_get_uuid;
+  iface->get_drive = g_mtp_volume_get_drive;
+  iface->get_mount = g_mtp_volume_get_mount;
+  iface->can_mount = g_mtp_volume_can_mount;
+  iface->can_eject = g_mtp_volume_can_eject;
+  iface->should_automount = g_mtp_volume_should_automount;
+  iface->mount_fn = g_mtp_volume_mount;
+  iface->mount_finish = g_mtp_volume_mount_finish;
+  iface->eject = NULL;
+  iface->eject_finish = NULL;
+  iface->get_identifier = g_mtp_volume_get_identifier;
+  iface->enumerate_identifiers = g_mtp_volume_enumerate_identifiers;
+  iface->get_activation_root = g_mtp_volume_get_activation_root;
+}
diff --git a/monitor/mtp/gmtpvolume.h b/monitor/mtp/gmtpvolume.h
new file mode 100644
index 0000000..5c2ea82
--- /dev/null
+++ b/monitor/mtp/gmtpvolume.h
@@ -0,0 +1,60 @@
+/* GIO - GLib Input, Output and Streaming Library
+ * 
+ * Copyright (C) 2006-2007 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Author: David Zeuthen <davidz redhat com>
+ */
+
+#ifndef __G_MTP_VOLUME_H__
+#define __G_MTP_VOLUME_H__
+
+#include <glib-object.h>
+#include <gio/gio.h>
+
+#include <gudev/gudev.h>
+#include "gmtpvolumemonitor.h"
+
+G_BEGIN_DECLS
+
+#define G_TYPE_MTP_VOLUME        (g_mtp_volume_get_type ())
+#define G_MTP_VOLUME(o)          (G_TYPE_CHECK_INSTANCE_CAST ((o), G_TYPE_MTP_VOLUME, GMtpVolume))
+#define G_MTP_VOLUME_CLASS(k)    (G_TYPE_CHECK_CLASS_CAST((k), G_TYPE_MTP_VOLUME, GMtpVolumeClass))
+#define G_IS_MTP_VOLUME(o)       (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_TYPE_MTP_VOLUME))
+#define G_IS_MTP_VOLUME_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), G_TYPE_MTP_VOLUME))
+
+typedef struct _GMtpVolumeClass GMtpVolumeClass;
+
+struct _GMtpVolumeClass {
+   GObjectClass parent_class;
+};
+
+GType g_mtp_volume_get_type (void) G_GNUC_CONST;
+
+GMtpVolume *g_mtp_volume_new            (GVolumeMonitor   *volume_monitor,
+                                                 GUdevDevice      *device,
+                                                 GUdevClient      *gudev_client,
+                                                 GFile            *activation_root);
+
+gboolean    g_mtp_volume_has_path       (GMtpVolume       *volume,
+                                             const char       *path);
+
+void        g_mtp_volume_removed        (GMtpVolume       *volume);
+
+G_END_DECLS
+
+#endif /* __G_MTP_VOLUME_H__ */
diff --git a/monitor/mtp/gmtpvolumemonitor.c b/monitor/mtp/gmtpvolumemonitor.c
new file mode 100644
index 0000000..0499627
--- /dev/null
+++ b/monitor/mtp/gmtpvolumemonitor.c
@@ -0,0 +1,342 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/* GIO - GLib Input, Output and Streaming Library
+ *
+ * Copyright (C) 2006-2007 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Author: David Zeuthen <davidz redhat com>
+ */
+
+#include <config.h>
+
+#include <limits.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include <glib.h>
+#include <glib/gi18n-lib.h>
+#include <gio/gio.h>
+
+#include "gmtpvolumemonitor.h"
+#include "gmtpvolume.h"
+
+#include <gio/gunixmounts.h>
+
+G_LOCK_DEFINE_STATIC(hal_vm);
+
+static GMtpVolumeMonitor *the_volume_monitor = NULL;
+
+struct _GMtpVolumeMonitor {
+  GNativeVolumeMonitor parent;
+
+  GUnixMountMonitor *mount_monitor;
+
+  GUdevClient *gudev_client;
+
+  GList *last_devices;
+
+  GList *device_volumes;
+};
+
+static void on_uevent                (GUdevClient *client, 
+                                      gchar *action,
+                                      GUdevDevice *device,
+                                      gpointer user_data);
+
+G_DEFINE_TYPE (GMtpVolumeMonitor, g_mtp_volume_monitor, G_TYPE_VOLUME_MONITOR)
+
+static void
+list_free (GList *objects)
+{
+  g_list_foreach (objects, (GFunc)g_object_unref, NULL);
+  g_list_free (objects);
+}
+
+static void
+g_mtp_volume_monitor_dispose (GObject *object)
+{
+  G_LOCK (hal_vm);
+  the_volume_monitor = NULL;
+  G_UNLOCK (hal_vm);
+
+  if (G_OBJECT_CLASS (g_mtp_volume_monitor_parent_class)->dispose)
+    (*G_OBJECT_CLASS (g_mtp_volume_monitor_parent_class)->dispose) (object);
+}
+
+static void
+g_mtp_volume_monitor_finalize (GObject *object)
+{
+  GMtpVolumeMonitor *monitor;
+
+  monitor = G_MTP_VOLUME_MONITOR (object);
+
+  g_signal_handlers_disconnect_by_func (monitor->gudev_client, on_uevent, monitor);
+
+  g_object_unref (monitor->gudev_client);
+
+  list_free (monitor->last_devices);
+  list_free (monitor->device_volumes);
+
+  if (G_OBJECT_CLASS (g_mtp_volume_monitor_parent_class)->finalize)
+    (*G_OBJECT_CLASS (g_mtp_volume_monitor_parent_class)->finalize) (object);
+}
+
+static GList *
+get_mounts (GVolumeMonitor *volume_monitor)
+{
+  return NULL;
+}
+
+static GList *
+get_volumes (GVolumeMonitor *volume_monitor)
+{
+  GMtpVolumeMonitor *monitor;
+  GList *l;
+
+  monitor = G_MTP_VOLUME_MONITOR (volume_monitor);
+
+  G_LOCK (hal_vm);
+
+  l = g_list_copy (monitor->device_volumes);
+  g_list_foreach (l, (GFunc)g_object_ref, NULL);
+
+  G_UNLOCK (hal_vm);
+
+  return l;
+}
+
+static GList *
+get_connected_drives (GVolumeMonitor *volume_monitor)
+{
+  return NULL;
+}
+
+static GVolume *
+get_volume_for_uuid (GVolumeMonitor *volume_monitor, const char *uuid)
+{
+  return NULL;
+}
+
+static GMount *
+get_mount_for_uuid (GVolumeMonitor *volume_monitor, const char *uuid)
+{
+  return NULL;
+}
+
+static void
+gudev_add_device (GMtpVolumeMonitor *monitor, GUdevDevice *device, gboolean do_emit)
+{
+    GMtpVolume *volume;
+    GList *store_heads, *l;
+    guint num_store_heads;
+    const char *usb_bus_num, *usb_device_num;
+
+    usb_bus_num = g_udev_device_get_property (device, "BUSNUM");
+    if (usb_bus_num == NULL) {
+	g_warning("device %s has no BUSNUM property, ignoring", g_udev_device_get_device_file (device));
+	return;
+    }
+
+    usb_device_num = g_udev_device_get_property (device, "DEVNUM");
+    if (usb_device_num == NULL) {
+	g_warning("device %s has no DEVNUM property, ignoring", g_udev_device_get_device_file (device));
+	return;
+    }
+
+    g_print ("gudev_add_device: device %s (bus: %i, device: %i)", 
+             g_udev_device_get_device_file (device),
+             usb_bus_num, usb_device_num);
+
+    gchar *uri = g_strdup_printf("mtp://[usb:%s,%s]", usb_bus_num, usb_device_num);
+    GFile *activation_mount_root;
+
+    activation_mount_root = g_file_new_for_uri (uri);
+    g_free (uri);
+
+    volume = g_mtp_volume_new (G_VOLUME_MONITOR (monitor),
+                               device, 
+                               monitor->gudev_client,
+                               activation_mount_root);
+        if (volume != NULL)
+          {
+            monitor->device_volumes = g_list_prepend (monitor->device_volumes, volume);
+            if (do_emit)
+                g_signal_emit_by_name (monitor, "volume_added", volume);
+          }
+
+        if (activation_mount_root != NULL)
+          g_object_unref (activation_mount_root);
+}
+
+static void
+gudev_remove_device (GMtpVolumeMonitor *monitor, GUdevDevice *device)
+{
+  GList *l, *ll;
+  const gchar* sysfs_path;
+
+  sysfs_path = g_udev_device_get_sysfs_path (device);
+
+  /* g_debug ("gudev_remove_device: %s", g_udev_device_get_device_file (device)); */
+
+  for (l = monitor->device_volumes; l != NULL; l = ll)
+    {
+      GMtpVolume *volume = G_MTP_VOLUME (l->data);
+
+      ll = l->next;
+
+      if (g_mtp_volume_has_path (volume, sysfs_path))
+        {
+          /* g_debug ("gudev_remove_device: found volume %s, deleting", sysfs_path); */
+          g_signal_emit_by_name (monitor, "volume_removed", volume);
+          g_signal_emit_by_name (volume, "removed");
+          g_mtp_volume_removed (volume);
+          monitor->device_volumes = g_list_remove (monitor->device_volumes, volume);
+          g_object_unref (volume);
+        }
+    }
+}
+
+static void
+on_uevent (GUdevClient *client, 
+           gchar *action,
+           GUdevDevice *device,
+           gpointer user_data)
+{
+  GMtpVolumeMonitor *monitor = G_MTP_VOLUME_MONITOR (user_data);
+
+  /* g_debug ("on_uevent: action=%s, device=%s", action, g_udev_device_get_device_file(device)); */
+
+  /* filter out uninteresting events */
+  if (!g_udev_device_has_property (device, "ID_MTP_DEVICE"))
+    {
+      /* g_debug ("on_uevent: discarding, not ID_MTP"); */
+      return;
+    }
+
+  if (strcmp (action, "add") == 0)
+     gudev_add_device (monitor, device, TRUE); 
+  else if (strcmp (action, "remove") == 0)
+     gudev_remove_device (monitor, device); 
+}
+
+static void
+gudev_coldplug_devices (GMtpVolumeMonitor *monitor)
+{
+    GList *usb_devices, *l;
+
+    usb_devices = g_udev_client_query_by_subsystem (monitor->gudev_client, "usb");
+    for (l = usb_devices; l != NULL; l = l->next)
+    {
+        GUdevDevice *d = l->data;
+        if (g_udev_device_has_property (d, "ID_MTP_DEVICE"))
+            gudev_add_device (monitor, d, FALSE);
+    }
+}
+
+static GObject *
+g_mtp_volume_monitor_constructor (GType                  type,
+                                  guint                  n_construct_properties,
+                                  GObjectConstructParam *construct_properties)
+{
+  GObject *object;
+  GMtpVolumeMonitor *monitor;
+  GMtpVolumeMonitorClass *klass;
+  GObjectClass *parent_class;
+
+  G_LOCK (hal_vm);
+  if (the_volume_monitor != NULL)
+    {
+      object = g_object_ref (the_volume_monitor);
+      G_UNLOCK (hal_vm);
+      return object;
+    }
+  G_UNLOCK (hal_vm);
+
+  /*g_warning ("creating hal vm");*/
+
+  object = NULL;
+
+  /* Invoke parent constructor. */
+  klass = G_MTP_VOLUME_MONITOR_CLASS (g_type_class_peek (G_TYPE_MTP_VOLUME_MONITOR));
+  parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
+  object = parent_class->constructor (type,
+                                      n_construct_properties,
+                                      construct_properties);
+
+  monitor = G_MTP_VOLUME_MONITOR (object);
+
+  const char *subsystems[] = {"usb", NULL};
+  monitor->gudev_client = g_udev_client_new (subsystems);
+
+  g_signal_connect (monitor->gudev_client, 
+                    "uevent", G_CALLBACK (on_uevent), 
+                    monitor);
+
+  gudev_coldplug_devices (monitor);
+
+  G_LOCK (hal_vm);
+  the_volume_monitor = monitor;
+  G_UNLOCK (hal_vm);
+
+  return object;
+}
+
+static void
+g_mtp_volume_monitor_init (GMtpVolumeMonitor *monitor)
+{
+}
+
+static gboolean
+is_supported (void)
+{
+  /* Today's Linux desktops pretty much need udev to have anything working, so
+   * assume it's there */
+  return TRUE;
+}
+
+static void
+g_mtp_volume_monitor_class_init (GMtpVolumeMonitorClass *klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+  GVolumeMonitorClass *monitor_class = G_VOLUME_MONITOR_CLASS (klass);
+
+  gobject_class->constructor = g_mtp_volume_monitor_constructor;
+  gobject_class->finalize = g_mtp_volume_monitor_finalize;
+  gobject_class->dispose = g_mtp_volume_monitor_dispose;
+
+  monitor_class->get_mounts = get_mounts;
+  monitor_class->get_volumes = get_volumes;
+  monitor_class->get_connected_drives = get_connected_drives;
+  monitor_class->get_volume_for_uuid = get_volume_for_uuid;
+  monitor_class->get_mount_for_uuid = get_mount_for_uuid;
+  monitor_class->is_supported = is_supported;
+}
+
+/**
+ * g_mtp_volume_monitor_new:
+ *
+ * Returns:  a new #GVolumeMonitor.
+ **/
+GVolumeMonitor *
+g_mtp_volume_monitor_new (void)
+{
+  GMtpVolumeMonitor *monitor;
+
+  monitor = g_object_new (G_TYPE_MTP_VOLUME_MONITOR, NULL);
+
+  return G_VOLUME_MONITOR (monitor);
+}
diff --git a/monitor/mtp/gmtpvolumemonitor.h b/monitor/mtp/gmtpvolumemonitor.h
new file mode 100644
index 0000000..fcf0140
--- /dev/null
+++ b/monitor/mtp/gmtpvolumemonitor.h
@@ -0,0 +1,54 @@
+/* GIO - GLib Input, Output and Streaming Library
+ * 
+ * Copyright (C) 2006-2007 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Author: David Zeuthen <davidz redhat com>
+ */
+
+#ifndef __G_MTP_VOLUME_MONITOR_H__
+#define __G_MTP_VOLUME_MONITOR_H__
+
+#include <glib-object.h>
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+#define G_TYPE_MTP_VOLUME_MONITOR        (g_mtp_volume_monitor_get_type ())
+#define G_MTP_VOLUME_MONITOR(o)          (G_TYPE_CHECK_INSTANCE_CAST ((o), G_TYPE_MTP_VOLUME_MONITOR, GMtpVolumeMonitor))
+#define G_MTP_VOLUME_MONITOR_CLASS(k)    (G_TYPE_CHECK_CLASS_CAST((k), G_TYPE_MTP_VOLUME_MONITOR, GMtpVolumeMonitorClass))
+#define G_IS_MTP_VOLUME_MONITOR(o)       (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_TYPE_MTP_VOLUME_MONITOR))
+#define G_IS_MTP_VOLUME_MONITOR_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), G_TYPE_MTP_VOLUME_MONITOR))
+
+typedef struct _GMtpVolumeMonitor GMtpVolumeMonitor;
+typedef struct _GMtpVolumeMonitorClass GMtpVolumeMonitorClass;
+
+/* Forward definitions */
+typedef struct _GMtpVolume GMtpVolume;
+
+struct _GMtpVolumeMonitorClass {
+  GVolumeMonitorClass parent_class;
+};
+
+GType g_mtp_volume_monitor_get_type (void) G_GNUC_CONST;
+
+GVolumeMonitor *g_mtp_volume_monitor_new                          (void);
+void            g_mtp_volume_monitor_force_update                 (GMtpVolumeMonitor *monitor);
+
+G_END_DECLS
+
+#endif /* __G_MTP_VOLUME_MONITOR_H__ */
diff --git a/monitor/mtp/mtp-volume-monitor-daemon.c b/monitor/mtp/mtp-volume-monitor-daemon.c
new file mode 100644
index 0000000..0b61a59
--- /dev/null
+++ b/monitor/mtp/mtp-volume-monitor-daemon.c
@@ -0,0 +1,41 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/* gvfs - extensions for gio
+ *
+ * Copyright (C) 2012 Philip Langdale <philipl overt org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <config.h>
+
+#include <glib.h>
+#include <glib/gi18n-lib.h>
+#include <gmodule.h>
+#include <gio/gio.h>
+
+#include <gvfsproxyvolumemonitordaemon.h>
+
+#include "gmtpvolumemonitor.h"
+
+int
+main (int argc, char *argv[])
+{
+  g_vfs_proxy_volume_monitor_daemon_init ();
+  return g_vfs_proxy_volume_monitor_daemon_main (argc,
+                                                 argv,
+                                                 "org.gtk.Private.MTPVolumeMonitor",
+                                                 G_TYPE_MTP_VOLUME_MONITOR);
+}
diff --git a/monitor/mtp/mtp.monitor b/monitor/mtp/mtp.monitor
new file mode 100644
index 0000000..bfb0c7f
--- /dev/null
+++ b/monitor/mtp/mtp.monitor
@@ -0,0 +1,4 @@
+[RemoteVolumeMonitor]
+Name=GProxyVolumeMonitorMTP
+DBusName=org.gtk.Private.MTPVolumeMonitor
+IsNative=false
diff --git a/monitor/mtp/org.gtk.Private.MTPVolumeMonitor.service.in b/monitor/mtp/org.gtk.Private.MTPVolumeMonitor.service.in
new file mode 100644
index 0000000..4cd7d19
--- /dev/null
+++ b/monitor/mtp/org.gtk.Private.MTPVolumeMonitor.service.in
@@ -0,0 +1,3 @@
+[D-BUS Service]
+Name=org.gtk.Private.MTPVolumeMonitor
+Exec= libexecdir@/gvfs-mtp-volume-monitor
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