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annotate mercurial/narrowspec.py @ 38872:576eef1ab43d

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narrow: move .hg/narrowspec to .hg/store/narrowspec (BC) The narrowspec is more closely related to the store than to the working copy. For example, if the narrowspec changes, the set of revlogs also needs to change (the working copy may change, but that depends on which commit is checked out). Also, when using the share extension, the narrowspec needs to be shared along with the store. This patch therefore moves the narrowspec into the store/ directory. This is clearly a breaking change, but I haven't bothered trying to fall back to reading the narrowspec from the old location (.hg/), because there are very few users of narrow out there. (We'll add a temporary hack to our Google-internal extension to handle the migration.) Differential Revision: https://phab.mercurial-scm.org/D4099
author Martin von Zweigbergk <martinvonz@google.com>
date Thu, 02 Aug 2018 14:57:20 -0700
parents 204e074c188e
children 2675d561f5cb
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1 # narrowspec.py - methods for working with a narrow view of a repository
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2 #
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3 # Copyright 2017 Google, Inc.
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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 errno
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11
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12 from .i18n import _
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13 from . import (
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14 error,
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15 match as matchmod,
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16 repository,
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17 sparse,
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18 util,
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19 )
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20
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21 FILENAME = 'narrowspec'
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22
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23 def parseserverpatterns(text):
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24 """Parses the narrowspec format that's returned by the server."""
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25 includepats = set()
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26 excludepats = set()
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27
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28 # We get one entry per line, in the format "<key> <value>".
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29 # It's OK for value to contain other spaces.
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30 for kp in (l.split(' ', 1) for l in text.splitlines()):
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31 if len(kp) != 2:
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32 raise error.Abort(_('Invalid narrowspec pattern line: "%s"') % kp)
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33 key = kp[0]
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34 pat = kp[1]
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35 if key == 'include':
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36 includepats.add(pat)
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37 elif key == 'exclude':
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38 excludepats.add(pat)
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39 else:
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40 raise error.Abort(_('Invalid key "%s" in server response') % key)
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41
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42 return includepats, excludepats
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43
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44 def normalizesplitpattern(kind, pat):
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45 """Returns the normalized version of a pattern and kind.
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46
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47 Returns a tuple with the normalized kind and normalized pattern.
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48 """
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49 pat = pat.rstrip('/')
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50 _validatepattern(pat)
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51 return kind, pat
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52
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53 def _numlines(s):
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54 """Returns the number of lines in s, including ending empty lines."""
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55 # We use splitlines because it is Unicode-friendly and thus Python 3
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56 # compatible. However, it does not count empty lines at the end, so trick
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57 # it by adding a character at the end.
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58 return len((s + 'x').splitlines())
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59
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60 def _validatepattern(pat):
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61 """Validates the pattern and aborts if it is invalid.
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62
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63 Patterns are stored in the narrowspec as newline-separated
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64 POSIX-style bytestring paths. There's no escaping.
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65 """
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66
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67 # We use newlines as separators in the narrowspec file, so don't allow them
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68 # in patterns.
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69 if _numlines(pat) > 1:
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70 raise error.Abort(_('newlines are not allowed in narrowspec paths'))
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71
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72 components = pat.split('/')
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73 if '.' in components or '..' in components:
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74 raise error.Abort(_('"." and ".." are not allowed in narrowspec paths'))
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75
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76 def normalizepattern(pattern, defaultkind='path'):
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77 """Returns the normalized version of a text-format pattern.
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78
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79 If the pattern has no kind, the default will be added.
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80 """
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81 kind, pat = matchmod._patsplit(pattern, defaultkind)
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82 return '%s:%s' % normalizesplitpattern(kind, pat)
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83
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84 def parsepatterns(pats):
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85 """Parses a list of patterns into a typed pattern set."""
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86 return set(normalizepattern(p) for p in pats)
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87
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88 def format(includes, excludes):
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89 output = '[include]\n'
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90 for i in sorted(includes - excludes):
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91 output += i + '\n'
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92 output += '[exclude]\n'
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93 for e in sorted(excludes):
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94 output += e + '\n'
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95 return output
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96
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97 def match(root, include=None, exclude=None):
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98 if not include:
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99 # Passing empty include and empty exclude to matchmod.match()
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100 # gives a matcher that matches everything, so explicitly use
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101 # the nevermatcher.
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102 return matchmod.never(root, '')
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103 return matchmod.match(root, '', [], include=include or [],
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104 exclude=exclude or [])
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105
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106 def needsexpansion(includes):
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107 return [i for i in includes if i.startswith('include:')]
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108
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109 def load(repo):
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110 try:
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111 spec = repo.svfs.read(FILENAME)
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112 except IOError as e:
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113 # Treat "narrowspec does not exist" the same as "narrowspec file exists
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114 # and is empty".
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115 if e.errno == errno.ENOENT:
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116 return set(), set()
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117 raise
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118 # maybe we should care about the profiles returned too
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119 includepats, excludepats, profiles = sparse.parseconfig(repo.ui, spec,
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120 'narrow')
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121 if profiles:
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122 raise error.Abort(_("including other spec files using '%include' is not"
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123 " suported in narrowspec"))
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124 return includepats, excludepats
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125
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126 def save(repo, includepats, excludepats):
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127 spec = format(includepats, excludepats)
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128 repo.svfs.write(FILENAME, spec)
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129
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130 def savebackup(repo, backupname):
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131 if repository.NARROW_REQUIREMENT not in repo.requirements:
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132 return
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133 vfs = repo.vfs
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134 vfs.tryunlink(backupname)
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135 util.copyfile(repo.svfs.join(FILENAME), vfs.join(backupname), hardlink=True)
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136
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137 def restorebackup(repo, backupname):
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138 if repository.NARROW_REQUIREMENT not in repo.requirements:
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139 return
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140 util.rename(repo.vfs.join(backupname), repo.svfs.join(FILENAME))
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141
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142 def clearbackup(repo, backupname):
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143 if repository.NARROW_REQUIREMENT not in repo.requirements:
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144 return
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145 repo.vfs.unlink(backupname)
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146
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147 def restrictpatterns(req_includes, req_excludes, repo_includes, repo_excludes):
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148 r""" Restricts the patterns according to repo settings,
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149 results in a logical AND operation
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150
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151 :param req_includes: requested includes
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152 :param req_excludes: requested excludes
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153 :param repo_includes: repo includes
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154 :param repo_excludes: repo excludes
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155 :return: include patterns, exclude patterns, and invalid include patterns.
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156
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157 >>> restrictpatterns({'f1','f2'}, {}, ['f1'], [])
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158 (set(['f1']), {}, [])
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159 >>> restrictpatterns({'f1'}, {}, ['f1','f2'], [])
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160 (set(['f1']), {}, [])
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161 >>> restrictpatterns({'f1/fc1', 'f3/fc3'}, {}, ['f1','f2'], [])
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162 (set(['f1/fc1']), {}, [])
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163 >>> restrictpatterns({'f1_fc1'}, {}, ['f1','f2'], [])
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164 ([], set(['path:.']), [])
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165 >>> restrictpatterns({'f1/../f2/fc2'}, {}, ['f1','f2'], [])
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166 (set(['f2/fc2']), {}, [])
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167 >>> restrictpatterns({'f1/../f3/fc3'}, {}, ['f1','f2'], [])
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168 ([], set(['path:.']), [])
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169 >>> restrictpatterns({'f1/$non_exitent_var'}, {}, ['f1','f2'], [])
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170 (set(['f1/$non_exitent_var']), {}, [])
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171 """
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172 res_excludes = set(req_excludes)
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173 res_excludes.update(repo_excludes)
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174 invalid_includes = []
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175 if not req_includes:
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176 res_includes = set(repo_includes)
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177 elif 'path:.' not in repo_includes:
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178 res_includes = []
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179 for req_include in req_includes:
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180 req_include = util.expandpath(util.normpath(req_include))
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181 if req_include in repo_includes:
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182 res_includes.append(req_include)
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183 continue
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184 valid = False
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185 for repo_include in repo_includes:
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186 if req_include.startswith(repo_include + '/'):
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187 valid = True
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188 res_includes.append(req_include)
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189 break
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190 if not valid:
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191 invalid_includes.append(req_include)
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192 if len(res_includes) == 0:
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193 res_excludes = {'path:.'}
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194 else:
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195 res_includes = set(res_includes)
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196 else:
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197 res_includes = set(req_includes)
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198 return res_includes, res_excludes, invalid_includes