Mercurial > hg
annotate mercurial/policy.py @ 32658:55ff67ffcead
scmutil: introduce binnode(ctx) as paired function with intrev(ctx)
It seemed silly to convert ctx.hex() back to binary to use node.hex/short(),
or to use [:12] instead of node.short() because ctx.node() could be None.
Eventually I want to change wctx.rev() and wctx.node() to return wdirrev and
wdirid respectively, but that's quite big API breakage and can't be achieved
without some compatibility wrappers.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sat, 03 Jun 2017 19:12:01 +0900 |
parents | 3f5d675fddf4 |
children | cd2aca0808f8 |
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 _packageprefs = { |
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26 # policy: (versioned package, pure package) |
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27 b'c': (r'cext', None), |
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28 b'allow': (r'cext', r'pure'), |
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29 b'cffi': (r'cffi', None), |
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30 b'cffi-allow': (r'cffi', r'pure'), |
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31 b'py': (None, r'pure'), |
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32 } |
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33 |
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34 try: |
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35 from . import __modulepolicy__ |
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36 policy = __modulepolicy__.modulepolicy |
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37 except ImportError: |
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38 pass |
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39 |
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40 # PyPy doesn't load C extensions. |
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41 # |
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42 # The canonical way to do this is to test platform.python_implementation(). |
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43 # But we don't import platform and don't bloat for it here. |
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44 if r'__pypy__' in sys.builtin_module_names: |
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45 policy = b'cffi' |
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46 |
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47 # Our C extensions aren't yet compatible with Python 3. So use pure Python |
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48 # on Python 3 for now. |
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49 if sys.version_info[0] >= 3: |
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50 policy = b'py' |
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51 |
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52 # Environment variable can always force settings. |
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53 if sys.version_info[0] >= 3: |
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54 if r'HGMODULEPOLICY' in os.environ: |
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55 policy = os.environ[r'HGMODULEPOLICY'].encode(r'utf-8') |
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56 else: |
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57 policy = os.environ.get(r'HGMODULEPOLICY', policy) |
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58 |
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59 def _importfrom(pkgname, modname): |
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60 # from .<pkgname> import <modname> (where . is looked through this module) |
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61 fakelocals = {} |
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62 pkg = __import__(pkgname, globals(), fakelocals, [modname], level=1) |
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63 try: |
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64 fakelocals[modname] = mod = getattr(pkg, modname) |
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65 except AttributeError: |
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66 raise ImportError(r'cannot import name %s' % modname) |
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67 # force import; fakelocals[modname] may be replaced with the real module |
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68 getattr(mod, r'__doc__', None) |
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69 return fakelocals[modname] |
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70 |
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71 # keep in sync with "version" in C modules |
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72 _cextversions = { |
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73 (r'cext', r'base85'): 1, |
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74 (r'cext', r'bdiff'): 1, |
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75 (r'cext', r'diffhelpers'): 1, |
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76 (r'cext', r'mpatch'): 1, |
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77 (r'cext', r'osutil'): 1, |
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78 (r'cext', r'parsers'): 1, |
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79 } |
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80 |
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81 def _checkmod(pkgname, modname, mod): |
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82 expected = _cextversions.get((pkgname, modname)) |
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83 actual = getattr(mod, r'version', None) |
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84 if actual != expected: |
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85 raise ImportError(r'cannot import module %s.%s ' |
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86 r'(expected version: %d, actual: %r)' |
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87 % (pkgname, modname, expected, actual)) |
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88 |
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89 def importmod(modname): |
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90 """Import module according to policy and check API version""" |
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91 try: |
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92 verpkg, purepkg = _packageprefs[policy] |
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93 except KeyError: |
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94 raise ImportError(r'invalid HGMODULEPOLICY %r' % policy) |
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95 assert verpkg or purepkg |
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96 if verpkg: |
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97 try: |
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98 mod = _importfrom(verpkg, modname) |
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99 _checkmod(verpkg, modname, mod) |
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100 return mod |
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101 except ImportError: |
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102 if not purepkg: |
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103 raise |
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104 return _importfrom(purepkg, modname) |