Mercurial > hg
annotate mercurial/policy.py @ 39634:9dffa99f9158
wireprotov2: add bookmarks to "changesetdata" command
Like we did for phases, we want to emit bookmarks data attached
to each changeset.
The approach here is very similar to phases: we emit bookmarks
data inline with requested revision data. But we emit
records for nodes that weren't requested as well so consumers have
access to the full set of defined bookmarks.
Differential Revision: https://phab.mercurial-scm.org/D4485
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Thu, 23 Aug 2018 18:14:19 -0700 |
parents | 481db51c83e9 |
children | f2342483f7a6 |
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 # Environment variable can always force settings. |
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48 if sys.version_info[0] >= 3: |
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49 if r'HGMODULEPOLICY' in os.environ: |
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50 policy = os.environ[r'HGMODULEPOLICY'].encode(r'utf-8') |
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51 else: |
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52 policy = os.environ.get(r'HGMODULEPOLICY', policy) |
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53 |
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54 def _importfrom(pkgname, modname): |
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55 # from .<pkgname> import <modname> (where . is looked through this module) |
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56 fakelocals = {} |
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57 pkg = __import__(pkgname, globals(), fakelocals, [modname], level=1) |
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58 try: |
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59 fakelocals[modname] = mod = getattr(pkg, modname) |
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60 except AttributeError: |
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61 raise ImportError(r'cannot import name %s' % modname) |
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62 # force import; fakelocals[modname] may be replaced with the real module |
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63 getattr(mod, r'__doc__', None) |
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64 return fakelocals[modname] |
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65 |
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66 # keep in sync with "version" in C modules |
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67 _cextversions = { |
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68 (r'cext', r'base85'): 1, |
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70 (r'cext', r'mpatch'): 1, |
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71 (r'cext', r'osutil'): 4, |
39452 | 72 (r'cext', r'parsers'): 11, |
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73 } |
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74 |
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75 # map import request to other package or module |
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76 _modredirects = { |
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77 (r'cext', r'charencode'): (r'cext', r'parsers'), |
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78 (r'cffi', r'base85'): (r'pure', r'base85'), |
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79 (r'cffi', r'charencode'): (r'pure', r'charencode'), |
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80 (r'cffi', r'parsers'): (r'pure', r'parsers'), |
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81 } |
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82 |
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83 def _checkmod(pkgname, modname, mod): |
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84 expected = _cextversions.get((pkgname, modname)) |
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85 actual = getattr(mod, r'version', None) |
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86 if actual != expected: |
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87 raise ImportError(r'cannot import module %s.%s ' |
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88 r'(expected version: %d, actual: %r)' |
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89 % (pkgname, modname, expected, actual)) |
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90 |
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91 def importmod(modname): |
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92 """Import module according to policy and check API version""" |
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93 try: |
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94 verpkg, purepkg = _packageprefs[policy] |
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95 except KeyError: |
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96 raise ImportError(r'invalid HGMODULEPOLICY %r' % policy) |
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97 assert verpkg or purepkg |
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98 if verpkg: |
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99 pn, mn = _modredirects.get((verpkg, modname), (verpkg, modname)) |
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100 try: |
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101 mod = _importfrom(pn, mn) |
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102 if pn == verpkg: |
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103 _checkmod(pn, mn, mod) |
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104 return mod |
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105 except ImportError: |
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106 if not purepkg: |
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107 raise |
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108 pn, mn = _modredirects.get((purepkg, modname), (purepkg, modname)) |
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109 return _importfrom(pn, mn) |