[gvfs] google: Fail in-fs copy/move if it leads to display name loss

[Ondrej Holy <oholy src gnome org>]

commit d236257299344207736086400960b0add2c1200b
Author: Ondrej Holy <oholy redhat com>
Date:   Mon Oct 19 13:48:46 2015 +0200

    google: Fail in-fs copy/move if it leads to display name loss
    
    Complicated file name handling on google backend leads to display name
    loss if in-fs copy and move operation is proceeded e.g. using Nautilus.
    Proper fix will require larger changes for the whole platform. Therefore
    fail the job preferably to avoid display name loss...
    
    https://bugzilla.gnome.org/show_bug.cgi?id=755701

 daemon/gvfsbackendgoogle.c |   20 ++++++++++++++++----
 1 files changed, 16 insertions(+), 4 deletions(-)
---
diff --git a/daemon/gvfsbackendgoogle.c b/daemon/gvfsbackendgoogle.c
index 0acec9a..59e2dfe 100644
--- a/daemon/gvfsbackendgoogle.c
+++ b/daemon/gvfsbackendgoogle.c
@@ -1192,6 +1192,22 @@ g_vfs_backend_google_copy (GVfsBackend           *_self,
         }
     }
 
+  etag = gdata_entry_get_etag (source_entry);
+  id = gdata_entry_get_id (source_entry);
+  summary = gdata_entry_get_summary (source_entry);
+
+  /* Fail the job if copy/move operation leads to display name loss.
+   * Use G_IO_ERROR_FAILED instead of _NOT_SUPPORTED to avoid r/w fallback.
+   * See: https://bugzilla.gnome.org/show_bug.cgi?id=755701 */
+  if (g_strcmp0 (id, destination_basename) == 0)
+    {
+      g_vfs_job_failed_literal (G_VFS_JOB (job),
+                                G_IO_ERROR,
+                                G_IO_ERROR_FAILED,
+                                _("Operation unsupported"));
+      goto out;
+    }
+
   if (destination_not_directory)
     {
       g_vfs_job_failed (G_VFS_JOB (job), G_IO_ERROR, G_IO_ERROR_NOT_DIRECTORY, _("The file is not a 
directory"));
@@ -1230,10 +1246,6 @@ g_vfs_backend_google_copy (GVfsBackend           *_self,
         }
     }
 
-  etag = gdata_entry_get_etag (source_entry);
-  id = gdata_entry_get_id (source_entry);
-  summary = gdata_entry_get_summary (source_entry);
-
   source_entry_type = G_OBJECT_TYPE (source_entry);
   dummy_source_entry = g_object_new (source_entry_type,
                                      "etag", etag,