Merge lp:~maxb/bzr-svn/preserve-tb into lp:bzr-svn/1.0

[Max Bowsher]

[Jelmer Vernooij (jelmer)]

I'd prefer renaming e to svn_error and e2 to bzr_error. Otherwise, happy to land this.

review: Approve

=== modified file 'errors.py'
--- errors.py	2010-08-01 03:55:05 +0000
+++ errors.py	2011-01-12 00:31:30 +0000
@@ -143,7 +143,13 @@
         try:
             return unbound(*args, **kwargs)
         except subvertpy.SubversionException, e:
-            raise convert_error(e)
+            e2 = convert_error(e)
+            if e is e2:
+                # Bare 'raise' preserves the original traceback, whereas
+                # 'raise e' would not.
+                raise
+            else:
+                raise e2
 
     convert.__doc__ = unbound.__doc__
     convert.__name__ = unbound.__name__