Patchwork [1,of,3] debuginstall: expose modulepolicy

# HG changeset patch
# User timeless <timeless@mozdev.org>
# Date 1457553345 0
#      Wed Mar 09 19:55:45 2016 +0000
# Node ID 94f71dd6051151a839d8516e7f174757c10a3cf2
# Parent  fd288d118074ea8d7b4ddec10da6e75a71ba3312
# EXP-Topic runtests
# Available At https://bitbucket.org/timeless/mercurial-crew
#              hg pull https://bitbucket.org/timeless/mercurial-crew -r 94f71dd60511
debuginstall: expose modulepolicy

With this, you can check for pure easily:
$ HGMODULEPOLICY=py ./hg debuginstall -T "{hgmodulepolicy}"
py

On Thu, May 26, 2016 at 02:25:49AM +0000, timeless wrote:
> # HG changeset patch
> # User timeless <timeless@mozdev.org>
> # Date 1457553345 0
> #      Wed Mar 09 19:55:45 2016 +0000
> # Node ID 94f71dd6051151a839d8516e7f174757c10a3cf2
> # Parent  fd288d118074ea8d7b4ddec10da6e75a71ba3312
> # EXP-Topic runtests
> # Available At https://bitbucket.org/timeless/mercurial-crew
> #              hg pull https://bitbucket.org/timeless/mercurial-crew -r 94f71dd60511
> debuginstall: expose modulepolicy

Queued this, seems generally useful.

>
> With this, you can check for pure easily:
> $ HGMODULEPOLICY=py ./hg debuginstall -T "{hgmodulepolicy}"
> py
>
> diff -r fd288d118074 -r 94f71dd60511 mercurial/__init__.py
> --- a/mercurial/__init__.py	Mon May 09 10:05:32 2016 +0200
> +++ b/mercurial/__init__.py	Wed Mar 09 19:55:45 2016 +0000
> @@ -12,36 +12,13 @@
>  import sys
>  import zipimport
>
> +from . import (
> +    policy
> +)
> +
>  __all__ = []
>
> -# Rules for how modules can be loaded. Values are:
> -#
> -#    c - require C extensions
> -#    allow - allow pure Python implementation when C loading fails
> -#    py - only load pure Python modules
> -#
> -# By default, require the C extensions for performance reasons.
> -modulepolicy = 'c'
> -try:
> -    from . import __modulepolicy__
> -    modulepolicy = __modulepolicy__.modulepolicy
> -except ImportError:
> -    pass
> -
> -# PyPy doesn't load C extensions.
> -#
> -# The canonical way to do this is to test platform.python_implementation().
> -# But we don't import platform and don't bloat for it here.
> -if '__pypy__' in sys.builtin_module_names:
> -    modulepolicy = 'py'
> -
> -# Our C extensions aren't yet compatible with Python 3. So use pure Python
> -# on Python 3 for now.
> -if sys.version_info[0] >= 3:
> -    modulepolicy = 'py'
> -
> -# Environment variable can always force settings.
> -modulepolicy = os.environ.get('HGMODULEPOLICY', modulepolicy)
> +modulepolicy = policy.policy
>
>  # Modules that have both Python and C implementations. See also the
>  # set of .py files under mercurial/pure/.
> diff -r fd288d118074 -r 94f71dd60511 mercurial/commands.py
> --- a/mercurial/commands.py	Mon May 09 10:05:32 2016 +0200
> +++ b/mercurial/commands.py	Wed Mar 09 19:55:45 2016 +0000
> @@ -59,6 +59,7 @@
>      obsolete,
>      patch,
>      phases,
> +    policy,
>      pvec,
>      repair,
>      revlog,
> @@ -2748,6 +2749,8 @@
>               '+'.join(hgver.split('+')[1:]))
>
>      # compiled modules
> +    fm.write('hgmodulepolicy', _("checking module policy (%s)\n"),
> +             policy.policy)
>      fm.write('hgmodules', _("checking installed modules (%s)...\n"),
>               os.path.dirname(__file__))
>
> diff -r fd288d118074 -r 94f71dd60511 mercurial/policy.py
> --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
> +++ b/mercurial/policy.py	Wed Mar 09 19:55:45 2016 +0000
> @@ -0,0 +1,40 @@
> +# policy.py - module policy logic for Mercurial.
> +#
> +# Copyright 2015 Gregory Szorc <gregory.szorc@gmail.com>
> +#
> +# This software may be used and distributed according to the terms of the
> +# GNU General Public License version 2 or any later version.
> +
> +from __future__ import absolute_import
> +
> +import os
> +import sys
> +
> +# Rules for how modules can be loaded. Values are:
> +#
> +#    c - require C extensions
> +#    allow - allow pure Python implementation when C loading fails
> +#    py - only load pure Python modules
> +#
> +# By default, require the C extensions for performance reasons.
> +policy = 'c'
> +try:
> +    from . import __modulepolicy__
> +    policy = __modulepolicy__.modulepolicy
> +except ImportError:
> +    pass
> +
> +# PyPy doesn't load C extensions.
> +#
> +# The canonical way to do this is to test platform.python_implementation().
> +# But we don't import platform and don't bloat for it here.
> +if '__pypy__' in sys.builtin_module_names:
> +    policy = 'py'
> +
> +# Our C extensions aren't yet compatible with Python 3. So use pure Python
> +# on Python 3 for now.
> +if sys.version_info[0] >= 3:
> +    policy = 'py'
> +
> +# Environment variable can always force settings.
> +policy = os.environ.get('HGMODULEPOLICY', policy)
> diff -r fd288d118074 -r 94f71dd60511 tests/test-install.t
> --- a/tests/test-install.t	Mon May 09 10:05:32 2016 +0200
> +++ b/tests/test-install.t	Wed Mar 09 19:55:45 2016 +0000
> @@ -6,6 +6,7 @@
>    checking Python lib (*lib*)... (glob)
>    checking Mercurial version (*) (glob)
>    checking Mercurial custom build (*) (glob)
> +  checking module policy (*) (glob)
>    checking installed modules (*mercurial)... (glob)
>    checking templates (*mercurial?templates)... (glob)
>    checking default template (*mercurial?templates?map-cmdline.default) (glob)
> @@ -25,6 +26,7 @@
>      "encoding": "ascii",
>      "encodingerror": null,
>      "extensionserror": null,
> +    "hgmodulepolicy": "*", (glob)
>      "hgmodules": "*mercurial", (glob)
>      "hgver": "*", (glob)
>      "hgverextra": "*", (glob)
> @@ -47,6 +49,7 @@
>    checking Python lib (*lib*)... (glob)
>    checking Mercurial version (*) (glob)
>    checking Mercurial custom build (*) (glob)
> +  checking module policy (*) (glob)
>    checking installed modules (*mercurial)... (glob)
>    checking templates (*mercurial?templates)... (glob)
>    checking default template (*mercurial?templates?map-cmdline.default) (glob)
> @@ -70,6 +73,7 @@
>    checking Python lib (*lib*)... (glob)
>    checking Mercurial version (*) (glob)
>    checking Mercurial custom build (*) (glob)
> +  checking module policy (*) (glob)
>    checking installed modules (*mercurial)... (glob)
>    checking templates (*mercurial?templates)... (glob)
>    checking default template (*mercurial?templates?map-cmdline.default) (glob)
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