Mercurial > hg
annotate mercurial/policy.py @ 32405:bdc4861ffe59
fsmonitor: fix silly "*kwargs" bug in merge.update() override
Everyone knows that it's supposed to be spelled with two asterisks.
It started failing in fad5e299cfc7 (update: accept --merge to allow
merging across topo branches (issue5125), 2017-02-13) because until
then there was only one argument that was covered by the kwargs, so
*kwargs or **kwargs both worked (or at least that's what I think with
my limited understanding of Python).
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Mon, 22 May 2017 10:41:32 -0700 |
parents | 8e0327dae3f4 |
children | 28b773aa3ff2 |
rev | line source |
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1 # policy.py - module policy logic for Mercurial. |
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2 # |
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3 # Copyright 2015 Gregory Szorc <gregory.szorc@gmail.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import os |
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11 import sys |
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12 |
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13 # Rules for how modules can be loaded. Values are: |
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14 # |
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15 # c - require C extensions |
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16 # allow - allow pure Python implementation when C loading fails |
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17 # cffi - required cffi versions (implemented within pure module) |
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18 # cffi-allow - allow pure Python implementation if cffi version is missing |
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19 # py - only load pure Python modules |
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20 # |
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21 # By default, fall back to the pure modules so the in-place build can |
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22 # run without recompiling the C extensions. This will be overridden by |
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23 # __modulepolicy__ generated by setup.py. |
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24 policy = b'allow' |
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25 policynoc = (b'cffi', b'cffi-allow', b'py') |
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26 policynocffi = (b'c', b'py') |
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27 _packageprefs = { |
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28 # policy: (versioned package, pure package) |
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29 b'c': (r'cext', None), |
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30 b'allow': (r'cext', r'pure'), |
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31 b'cffi': (None, r'pure'), # TODO: (r'cffi', None) |
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32 b'cffi-allow': (None, r'pure'), # TODO: (r'cffi', r'pure') |
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33 b'py': (None, r'pure'), |
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34 } |
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35 |
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36 try: |
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37 from . import __modulepolicy__ |
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38 policy = __modulepolicy__.modulepolicy |
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39 except ImportError: |
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40 pass |
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41 |
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42 # PyPy doesn't load C extensions. |
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43 # |
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44 # The canonical way to do this is to test platform.python_implementation(). |
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45 # But we don't import platform and don't bloat for it here. |
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46 if r'__pypy__' in sys.builtin_module_names: |
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47 policy = b'cffi' |
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48 |
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49 # Our C extensions aren't yet compatible with Python 3. So use pure Python |
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50 # on Python 3 for now. |
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51 if sys.version_info[0] >= 3: |
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52 policy = b'py' |
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53 |
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54 # Environment variable can always force settings. |
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55 if sys.version_info[0] >= 3: |
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56 if r'HGMODULEPOLICY' in os.environ: |
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57 policy = os.environ[r'HGMODULEPOLICY'].encode(r'utf-8') |
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58 else: |
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59 policy = os.environ.get(r'HGMODULEPOLICY', policy) |
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60 |
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61 def _importfrom(pkgname, modname): |
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62 # from .<pkgname> import <modname> (where . is looked through this module) |
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63 fakelocals = {} |
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64 pkg = __import__(pkgname, globals(), fakelocals, [modname], level=1) |
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65 try: |
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66 fakelocals[modname] = mod = getattr(pkg, modname) |
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67 except AttributeError: |
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68 raise ImportError(r'cannot import name %s' % modname) |
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69 # force import; fakelocals[modname] may be replaced with the real module |
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70 getattr(mod, r'__doc__', None) |
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71 return fakelocals[modname] |
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72 |
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73 def _checkmod(pkgname, modname, mod): |
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74 expected = 1 # TODO: maybe defined in table? |
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75 actual = getattr(mod, r'version', None) |
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76 if actual != expected: |
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77 raise ImportError(r'cannot import module %s.%s ' |
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78 r'(expected version: %d, actual: %r)' |
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79 % (pkgname, modname, expected, actual)) |
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80 |
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81 def importmod(modname): |
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82 """Import module according to policy and check API version""" |
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83 try: |
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84 verpkg, purepkg = _packageprefs[policy] |
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85 except KeyError: |
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86 raise ImportError(r'invalid HGMODULEPOLICY %r' % policy) |
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87 assert verpkg or purepkg |
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88 if verpkg: |
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89 try: |
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90 mod = _importfrom(verpkg, modname) |
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91 _checkmod(verpkg, modname, mod) |
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92 return mod |
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93 except ImportError: |
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94 if not purepkg: |
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95 raise |
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96 return _importfrom(purepkg, modname) |