[PATCH stable] lock: handle race in trylock/testlock on Windows

[Nikolaj Sjujskij]

On Wed, 02 Oct 2013 16:59:28 +0400, Yuya Nishihara <yuya at tcha.org> wrote:

> # HG changeset patch
> # User Yuya Nishihara <yuya at tcha.org>
> # Date 1380716200 -32400
> #      Wed Oct 02 21:16:40 2013 +0900
> # Branch stable
> # Node ID 964b123c4831abac69efc5a089c446222915713f
> # Parent  4d513f96a565639c0879086b68cf72a1e01e596c
> lock: handle race in trylock/testlock on Windows
>
> readlock may raise IOError if the system does not support symlink.
>
> diff --git a/mercurial/lock.py b/mercurial/lock.py
> --- a/mercurial/lock.py
> +++ b/mercurial/lock.py
> @@ -100,7 +100,7 @@ class lock(object):
>          """
>          try:
>              locker = util.readlock(self.f)
> -        except OSError, why:
> +        except (OSError, IOError), why:
>              if why.errno == errno.ENOENT:
>                  return None
>              raise

  Could IOError.errno == errno.ENOENT? Otherwise this change doesn't seem  
to really change anything.