Fixed libbe.command.diff + ugly BugDir.duplicate_bugdir implementation

duplicate_bugdir() works, but for the vcs backends, it could require
shelling out for _every_ file read.  This could, and probably will, be
horribly slow.  Still it works ;).

I'm not sure what a better implementation would be.  The old
implementation checked out the entire earlier state into a temporary
directory
  pros: single shell out, simple upgrade implementation
  cons: wouldn't work well for HTTP backens

I think a good solution would run along the lines of the currently
commented out code in duplicate_bugdir(), where a
  VersionedStorage.changed_since(revision)
call would give you a list of changed files.  diff could work off of
that directly, without the need to generate a whole duplicate bugdir.
I'm stuck on how to handle upgrades though...

Also removed trailing whitespace from all python files.

1 files changed, 1 insertions, 1 deletions

diff --git a/libbe/command/target.py b/libbe/command/target.py
index 034c532..df836db 100644
--- a/libbe/command/target.py
+++ b/libbe/command/target.py
@@ -58,7 +58,7 @@ class Target (libbe.command.Command):
     >>> bd.cleanup()
     """
     name = 'target'
-    
+
     def __init__(self, *args, **kwargs):
         libbe.command.Command.__init__(self, *args, **kwargs)
         self.options.extend([