[PATCH 13 of 14] vfs: use unlink

[Jun Wu]

Excerpts from Ryan McElroy's message of 2017-03-20 19:10:56 -0700:
> # HG changeset patch
> # User Ryan McElroy <rmcelroy at fb.com>
> # Date 1490059858 25200
> #      Mon Mar 20 18:30:58 2017 -0700
> # Node ID 912717e0a0921df8cb8440ce69185850e53788ba
> # Parent  f405f3bb1b9686322545a61d2f8df45ff53b4527
> vfs: use unlink
> 
> diff --git a/mercurial/vfs.py b/mercurial/vfs.py
> --- a/mercurial/vfs.py
> +++ b/mercurial/vfs.py
> @@ -400,10 +400,7 @@ class vfs(abstractvfs):
>      def symlink(self, src, dst):
>          self.audit(dst)
>          linkname = self.join(dst)
> -        try:
> -            os.unlink(linkname)
> -        except OSError:
> -            pass
> +        util.tryunlink(linkname)

This could probably be changed to "self.tryunlink(dst)".

>  
>          util.makedirs(os.path.dirname(linkname), self.createmode)
>