Support the trash portal

When we are in a sandbox, try to trash files via a portal.
It works.

docs/reference/gio/meson.build

@@ -75,6 +75,7 @@ if get_option('gtk_doc')
     'gsocks5proxy.h',
     'gsubprocesslauncher-private.h',
     'gthreadedresolver.h',
+    'gtrashportal.h',
     'gunionvolumemonitor.h',
     'gunixmount.h',
     'gunixresolver.h',

gio/glocalfile.c

@@ -66,6 +66,8 @@
 #include "glibintl.h"
 #ifdef G_OS_UNIX
 #include "glib-unix.h"
+#include "gportalsupport.h"
+#include "gtrashportal.h"
 #endif
 
 #include "glib-private.h"
@@ -1950,6 +1952,9 @@ g_local_file_trash (GFile         *file,
   GVfs *vfs;
   int errsv;
 
+  if (glib_should_use_portal ())
+    return g_trash_portal_trash_file (file, error);
+
   if (g_lstat (local->filename, &file_stat) != 0)
     {
       errsv = errno;

gio/gtrashportal.c

@@ -0,0 +1,123 @@
+/* GIO - GLib Input, Output and Streaming Library
+ *
+ * Copyright 2018, 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 2.1 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+
+#include "gtrashportal.h"
+#include "xdp-dbus.h"
+#include "gstdio.h"
+
+#ifdef G_OS_UNIX
+#include "gunixfdlist.h"
+#endif
+
+#ifndef O_CLOEXEC
+#define O_CLOEXEC 0
+#else
+#define HAVE_O_CLOEXEC 1
+#endif
+
+static GXdpTrash *
+ensure_trash_portal (void)
+{
+  static GXdpTrash *trash = NULL;
+
+  if (g_once_init_enter (&trash))
+    {
+      GDBusConnection *connection = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, NULL);
+      GXdpTrash *proxy = NULL;
+
+      if (connection != NULL)
+        {
+          proxy = gxdp_trash_proxy_new_sync (connection, 0,
+                                             "org.freedesktop.portal.Desktop",
+                                             "/org/freedesktop/portal/desktop",
+                                             NULL, NULL);
+          g_object_unref (connection);
+        }
+
+      g_once_init_leave (&trash, proxy);
+    }
+
+  return trash;
+}
+
+gboolean
+g_trash_portal_trash_file (GFile   *file,
+                           GError **error)
+{
+  char *path = NULL;
+  GUnixFDList *fd_list = NULL;
+  int fd, fd_in, errsv;
+  gboolean ret = FALSE;
+  GXdpTrash *proxy;
+  
+  proxy = ensure_trash_portal ();
+  if (proxy == NULL)
+    {
+      g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED,
+                   "Trash portal is not available");
+      goto out;
+    }
+
+  path = g_file_get_path (file);
+
+  fd = g_open (path, O_RDWR | O_CLOEXEC);
+  if (fd == -1 && (errno == EACCES || errno == EISDIR))
+    /* If we don't have write access, fall back to read-only */
+    fd = g_open (path, O_CLOEXEC | O_RDONLY);
+
+  errsv = errno;
+
+  if (fd == -1)
+    {
+      g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errsv),
+                   "Failed to open %s", path);
+      goto out;
+    }
+
+#ifndef HAVE_O_CLOEXEC
+  fcntl (fd, F_SETFD, FD_CLOEXEC);
+#endif
+
+  fd_list = g_unix_fd_list_new ();
+  fd_in = g_unix_fd_list_append (fd_list, fd, error);
+  g_close (fd, NULL);
+
+  if (fd_in == -1)
+    goto out;
+
+  ret = gxdp_trash_call_trash_file_sync (proxy,
+                                         g_variant_new_handle (fd_in),
+                                         fd_list,
+                                         NULL,
+                                         NULL,
+                                         NULL,
+                                         error);
+
+ out:
+  g_clear_object (&fd_list);
+  g_free (path);
+
+  return ret;
+}

gio/gtrashportal.h

@@ -0,0 +1,31 @@
+/* GIO - GLib Input, Output and Streaming Library
+ *
+ * Copyright 2018 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 2.1 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __G_TRASH_PORTAL_H__
+
+#include <glib.h>
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+gboolean g_trash_portal_trash_file (GFile   *file,
+                                    GError **error);
+
+G_END_DECLS
+
+#endif

gio/meson.build

@@ -238,7 +238,8 @@ subdir('gdbus-2.0/codegen')
 xdp_dbus_generated = custom_target('xdp-dbus',
     input : ['org.freedesktop.portal.Documents.xml',
              'org.freedesktop.portal.OpenURI.xml',
-             'org.freedesktop.portal.ProxyResolver.xml'],
+             'org.freedesktop.portal.ProxyResolver.xml',
+             'org.freedesktop.portal.Trash.xml'],
     output : ['xdp-dbus.h', 'xdp-dbus.c'],
     depend_files : gdbus_codegen_built_files,
     command : [python, gdbus_codegen,
@@ -254,6 +255,8 @@ xdp_dbus_generated = custom_target('xdp-dbus',
                              'org.gtk.GDBus.C.UnixFD', 'true',
                '--annotate', 'org.freedesktop.portal.OpenURI.OpenFile()',
                              'org.gtk.GDBus.C.UnixFD', 'true',
+               '--annotate', 'org.freedesktop.portal.Trash.TrashFile()',
+                             'org.gtk.GDBus.C.UnixFD', 'true',
                '@INPUT@'])
 
 # Generate gdbus-generated.{c,h}
@@ -392,6 +395,7 @@ if host_system != 'windows'
     'gopenuriportal.c',
     'gnetworkmonitorportal.c',
     'gproxyresolverportal.c',
+    'gtrashportal.c',
     'gportalsupport.c',
     'gportalnotificationbackend.c'),
     xdp_dbus_generated

gio/org.freedesktop.portal.Trash.xml

@@ -0,0 +1,48 @@
+<?xml version="1.0"?>
+<!--
+ Copyright (C) 2016 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, see <http://www.gnu.org/licenses/>.
+
+ Author: Matthias Clasen <mclasen@redhat.com>
+-->
+
+<node name="/" xmlns:doc="http://www.freedesktop.org/dbus/1.0/doc.dtd">
+  <!--
+      org.freedesktop.portal.Trash:
+      @short_description: Portal for trashing files
+
+      This simple interface lets sandboxed applications send files to
+      the trashcan.
+
+      This documentation describes version 1 of this interface.
+  -->
+  <interface name="org.freedesktop.portal.Trash">
+    <!--
+        TrashFile:
+	@fd: file descriptor for the file to trash
+        @result: the result. 0 if trashing failed, 1 if trashing succeeded, other values may be returned in the future
+
+        Sends a file to the trashcan. Applications are allowed to
+        trash a file if they can open it in r/w mode.
+    -->
+    <method name="TrashFile">
+      <annotation name="org.gtk.GDBus.C.UnixFD" value="true"/>
+      <arg type="h" name="fd" direction="in"/>
+      <arg type="u" name="result" direction="out"/>
+    </method>
+
+    <property name="version" type="u" access="read"/>
+  </interface>
+</node>