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, 2 insertions, 2 deletions

diff --git a/libbe/storage/vcs/arch.py b/libbe/storage/vcs/arch.py
index 8afdca9..f1b5b7b 100644
--- a/libbe/storage/vcs/arch.py
+++ b/libbe/storage/vcs/arch.py
@@ -167,7 +167,7 @@ class Arch(base.VCS):
           http://regexps.srparish.net/tutorial-tla/naming-conventions.html
         Since our bug directory '.be' doesn't satisfy these conventions,
         we need to adjust them.
-        
+
         The conventions are specified in
           project-root/{arch}/=tagging-method
         """
@@ -211,7 +211,7 @@ class Arch(base.VCS):
             dirname = path
         status,output,error = self._u_invoke_client('tree-root', dirname)
         root = output.rstrip('\n')
-        
+
         self._get_archive_project_name(root)
 
         return root