diff mercurial/error.py @ 13447:931a72e00efa stable

introduce new RequirementError (issue2649)

This improves the misleading error message

  $ hg identify
  abort: there is no Mercurial repository here (.hg not found)!

to the more explicit

  $ hg identify
  abort: requirement 'fake' not supported!

for all commands in commands.optionalrepo, which includes the identify
and serve commands in particular.

This is for the case when a new entry in .hg/requires will be defined
in a future Mercurial release.

--- a/mercurial/error.py	Thu Feb 10 09:03:06 2011 +0100
+++ b/mercurial/error.py	Fri Feb 18 20:25:25 2011 +0100
@@ -51,6 +51,10 @@
 class CapabilityError(RepoError):
     pass
 
+class RequirementError(RepoError):
+    """Exception raised if .hg/requires has an unknown entry."""
+    pass
+
 class LockError(IOError):
     def __init__(self, errno, strerror, filename, desc):
         IOError.__init__(self, errno, strerror, filename)