[PATCH 3 of 5] chgserver: add utilities to calculate mtimehash

[Yuya Nishihara]

On Wed, 24 Feb 2016 22:30:14 +0000, Jun Wu wrote:
> # HG changeset patch
> # User Jun Wu <quark at fb.com>
> # Date 1456346533 0
> #      Wed Feb 24 20:42:13 2016 +0000
> # Node ID 66e1c30b8f82615f6154d7ca59dc9b30c230c257
> # Parent  0f9e0de14b62ea174bf0af8284a17ef6801ca2ae
> chgserver: add utilities to calculate mtimehash
> 
> mtimehash is designed to detect file changes. These files include:
> - single file extensions (__init__.py for complex extensions)
> - mercurial/__version__.py
> - python (sys.executable)
> 
> mtimehash only uses stat to check files so it's fast but not 100% accurate.
> However it should be good enough for our use case.
> 
> For chgserver, once mtimehash changes, the server is considered outdated
> immediately and should no longer provide service.
> 
> diff --git a/hgext/chgserver.py b/hgext/chgserver.py
> --- a/hgext/chgserver.py
> +++ b/hgext/chgserver.py
> @@ -31,10 +31,12 @@
>  import SocketServer
>  import errno
>  import hashlib
> +import inspect
>  import os
>  import re
>  import signal
>  import struct
> +import sys
>  import threading
>  import time
>  import traceback
> @@ -42,11 +44,13 @@
>  from mercurial.i18n import _
>  
>  from mercurial import (
> +    __version__,
>      cmdutil,
>      commands,
>      commandserver,
>      dispatch,
>      error,
> +    extensions,
>      osutil,
>      util,
>  )
> @@ -89,6 +93,46 @@
>      envhash = _hashlist(sorted(envitems))
>      return sectionhash[:6] + envhash[:6]
>  
> +def _getmtimepaths(ui):
> +    """get a list of paths that should be checked to detect change
> +
> +    The list will include:
> +    - extensions (will not cover all files for complex extensions)
> +    - mercurial.__version__
> +    - python binary
> +    """
> +    modules = [m for _, m in extensions.extensions(ui)]

Nit: shadows i18n._.