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/severity.py b/libbe/command/severity.py
index 9289138..7c1d305 100644
--- a/libbe/command/severity.py
+++ b/libbe/command/severity.py
@@ -59,7 +59,7 @@ class Severity (libbe.command.Command):
                     repeatable=True,
                     completion_callback=libbe.command.util.complete_bug_id),
                 ])
-    
+
     def _run(self, **params):
         bugdir = self._get_bugdir()
         for bug_id in params['bug-id']: