subrepo: add subrepo property to SubrepoAbort exceptions

This new property contains the path of the subrepo that generated the exception.
This information can then be used by GUI tools such as TortoiseHg.

mercurial/subrepo.py

@@ -16,6 +16,9 b" nullstate = ('', '', 'empty')"
 
 class SubrepoAbort(error.Abort):
     """Exception class used to avoid handling a subrepo error more than once"""
+    def __init__(self, *args, **kw):
+        super(SubrepoAbort, self).__init__(*args, **kw)
+        self.subrepo = kw.get('subrepo')
 
 def annotatesubrepoerror(func):
     def decoratedmethod(self, *args, **kargs):
@@ -25,9 +28,10 b' def annotatesubrepoerror(func):'
             # This exception has already been handled
             raise ex
         except error.Abort, ex:
-            errormsg = _('%s (in subrepo %s)') % (str(ex), subrelpath(self))
+            subrepo = subrelpath(self)
+            errormsg = _('%s (in subrepo %s)') % (str(ex), subrepo)
             # avoid handling this exception by raising a SubrepoAbort exception
-            raise SubrepoAbort(errormsg, hint=ex.hint)
+            raise SubrepoAbort(errormsg, hint=ex.hint, subrepo=subrepo)
         return res
     return decoratedmethod