Mercurial > hg
annotate mercurial/narrowspec.py @ 41541:595a67a301ee
check-config: use raw strings for regular expressions
This avoids SyntaxWarning on Python 3.8 for invalid \ escapes.
Differential Revision: https://phab.mercurial-scm.org/D5826
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 04 Feb 2019 09:34:11 -0800 |
parents | 88a7c211b21e |
children | 0531dff73d0b |
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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 merge, |
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17 repository, |
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18 sparse, |
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19 util, |
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20 ) |
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21 |
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22 # The file in .hg/store/ that indicates which paths exit in the store |
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23 FILENAME = 'narrowspec' |
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24 # The file in .hg/ that indicates which paths exit in the dirstate |
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25 DIRSTATE_FILENAME = 'narrowspec.dirstate' |
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26 |
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27 # Pattern prefixes that are allowed in narrow patterns. This list MUST |
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28 # only contain patterns that are fast and safe to evaluate. Keep in mind |
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29 # that patterns are supplied by clients and executed on remote servers |
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30 # as part of wire protocol commands. That means that changes to this |
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31 # data structure influence the wire protocol and should not be taken |
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32 # lightly - especially removals. |
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33 VALID_PREFIXES = ( |
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34 b'path:', |
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35 b'rootfilesin:', |
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36 ) |
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37 |
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38 def normalizesplitpattern(kind, pat): |
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39 """Returns the normalized version of a pattern and kind. |
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40 |
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41 Returns a tuple with the normalized kind and normalized pattern. |
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42 """ |
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43 pat = pat.rstrip('/') |
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44 _validatepattern(pat) |
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45 return kind, pat |
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46 |
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47 def _numlines(s): |
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48 """Returns the number of lines in s, including ending empty lines.""" |
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49 # We use splitlines because it is Unicode-friendly and thus Python 3 |
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50 # compatible. However, it does not count empty lines at the end, so trick |
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51 # it by adding a character at the end. |
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52 return len((s + 'x').splitlines()) |
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53 |
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54 def _validatepattern(pat): |
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55 """Validates the pattern and aborts if it is invalid. |
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56 |
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57 Patterns are stored in the narrowspec as newline-separated |
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58 POSIX-style bytestring paths. There's no escaping. |
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59 """ |
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60 |
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61 # We use newlines as separators in the narrowspec file, so don't allow them |
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62 # in patterns. |
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63 if _numlines(pat) > 1: |
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64 raise error.Abort(_('newlines are not allowed in narrowspec paths')) |
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65 |
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66 components = pat.split('/') |
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67 if '.' in components or '..' in components: |
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68 raise error.Abort(_('"." and ".." are not allowed in narrowspec paths')) |
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69 |
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70 def normalizepattern(pattern, defaultkind='path'): |
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71 """Returns the normalized version of a text-format pattern. |
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72 |
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73 If the pattern has no kind, the default will be added. |
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74 """ |
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75 kind, pat = matchmod._patsplit(pattern, defaultkind) |
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76 return '%s:%s' % normalizesplitpattern(kind, pat) |
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77 |
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78 def parsepatterns(pats): |
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79 """Parses an iterable of patterns into a typed pattern set. |
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80 |
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81 Patterns are assumed to be ``path:`` if no prefix is present. |
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82 For safety and performance reasons, only some prefixes are allowed. |
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83 See ``validatepatterns()``. |
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84 |
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85 This function should be used on patterns that come from the user to |
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86 normalize and validate them to the internal data structure used for |
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87 representing patterns. |
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88 """ |
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89 res = {normalizepattern(orig) for orig in pats} |
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90 validatepatterns(res) |
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91 return res |
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92 |
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93 def validatepatterns(pats): |
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94 """Validate that patterns are in the expected data structure and format. |
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95 |
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96 And that is a set of normalized patterns beginning with ``path:`` or |
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97 ``rootfilesin:``. |
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98 |
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99 This function should be used to validate internal data structures |
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100 and patterns that are loaded from sources that use the internal, |
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101 prefixed pattern representation (but can't necessarily be fully trusted). |
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102 """ |
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103 if not isinstance(pats, set): |
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104 raise error.ProgrammingError('narrow patterns should be a set; ' |
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105 'got %r' % pats) |
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106 |
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107 for pat in pats: |
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108 if not pat.startswith(VALID_PREFIXES): |
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109 # Use a Mercurial exception because this can happen due to user |
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110 # bugs (e.g. manually updating spec file). |
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111 raise error.Abort(_('invalid prefix on narrow pattern: %s') % pat, |
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112 hint=_('narrow patterns must begin with one of ' |
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113 'the following: %s') % |
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114 ', '.join(VALID_PREFIXES)) |
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115 |
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116 def format(includes, excludes): |
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117 output = '[include]\n' |
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118 for i in sorted(includes - excludes): |
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119 output += i + '\n' |
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120 output += '[exclude]\n' |
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121 for e in sorted(excludes): |
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122 output += e + '\n' |
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123 return output |
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124 |
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125 def match(root, include=None, exclude=None): |
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126 if not include: |
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127 # Passing empty include and empty exclude to matchmod.match() |
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128 # gives a matcher that matches everything, so explicitly use |
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129 # the nevermatcher. |
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130 return matchmod.never(root, '') |
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131 return matchmod.match(root, '', [], include=include or [], |
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132 exclude=exclude or []) |
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133 |
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134 def parseconfig(ui, spec): |
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135 # maybe we should care about the profiles returned too |
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136 includepats, excludepats, profiles = sparse.parseconfig(ui, spec, 'narrow') |
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137 if profiles: |
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138 raise error.Abort(_("including other spec files using '%include' is not" |
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139 " supported in narrowspec")) |
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140 |
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141 validatepatterns(includepats) |
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142 validatepatterns(excludepats) |
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143 |
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144 return includepats, excludepats |
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145 |
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146 def load(repo): |
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147 try: |
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148 spec = repo.svfs.read(FILENAME) |
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149 except IOError as e: |
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150 # Treat "narrowspec does not exist" the same as "narrowspec file exists |
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151 # and is empty". |
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152 if e.errno == errno.ENOENT: |
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153 return set(), set() |
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154 raise |
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155 |
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156 return parseconfig(repo.ui, spec) |
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157 |
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158 def save(repo, includepats, excludepats): |
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159 validatepatterns(includepats) |
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160 validatepatterns(excludepats) |
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161 spec = format(includepats, excludepats) |
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162 repo.svfs.write(FILENAME, spec) |
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163 |
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164 def copytoworkingcopy(repo): |
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165 spec = repo.svfs.read(FILENAME) |
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166 repo.vfs.write(DIRSTATE_FILENAME, spec) |
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167 |
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168 def savebackup(repo, backupname): |
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169 if repository.NARROW_REQUIREMENT not in repo.requirements: |
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170 return |
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171 svfs = repo.svfs |
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172 svfs.tryunlink(backupname) |
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173 util.copyfile(svfs.join(FILENAME), svfs.join(backupname), hardlink=True) |
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174 |
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175 def restorebackup(repo, backupname): |
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176 if repository.NARROW_REQUIREMENT not in repo.requirements: |
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177 return |
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178 util.rename(repo.svfs.join(backupname), repo.svfs.join(FILENAME)) |
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179 |
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180 def savewcbackup(repo, backupname): |
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181 if repository.NARROW_REQUIREMENT not in repo.requirements: |
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182 return |
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183 vfs = repo.vfs |
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184 vfs.tryunlink(backupname) |
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185 # It may not exist in old repos |
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186 if vfs.exists(DIRSTATE_FILENAME): |
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187 util.copyfile(vfs.join(DIRSTATE_FILENAME), vfs.join(backupname), |
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188 hardlink=True) |
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189 |
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190 def restorewcbackup(repo, backupname): |
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191 if repository.NARROW_REQUIREMENT not in repo.requirements: |
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192 return |
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193 # It may not exist in old repos |
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194 if repo.vfs.exists(backupname): |
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195 util.rename(repo.vfs.join(backupname), repo.vfs.join(DIRSTATE_FILENAME)) |
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196 |
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197 def clearwcbackup(repo, backupname): |
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198 if repository.NARROW_REQUIREMENT not in repo.requirements: |
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199 return |
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200 repo.vfs.tryunlink(backupname) |
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201 |
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202 def restrictpatterns(req_includes, req_excludes, repo_includes, repo_excludes): |
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203 r""" Restricts the patterns according to repo settings, |
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204 results in a logical AND operation |
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205 |
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206 :param req_includes: requested includes |
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207 :param req_excludes: requested excludes |
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208 :param repo_includes: repo includes |
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209 :param repo_excludes: repo excludes |
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210 :return: include patterns, exclude patterns, and invalid include patterns. |
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211 |
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212 >>> restrictpatterns({'f1','f2'}, {}, ['f1'], []) |
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213 (set(['f1']), {}, []) |
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214 >>> restrictpatterns({'f1'}, {}, ['f1','f2'], []) |
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215 (set(['f1']), {}, []) |
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216 >>> restrictpatterns({'f1/fc1', 'f3/fc3'}, {}, ['f1','f2'], []) |
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217 (set(['f1/fc1']), {}, []) |
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218 >>> restrictpatterns({'f1_fc1'}, {}, ['f1','f2'], []) |
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219 ([], set(['path:.']), []) |
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220 >>> restrictpatterns({'f1/../f2/fc2'}, {}, ['f1','f2'], []) |
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221 (set(['f2/fc2']), {}, []) |
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222 >>> restrictpatterns({'f1/../f3/fc3'}, {}, ['f1','f2'], []) |
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223 ([], set(['path:.']), []) |
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224 >>> restrictpatterns({'f1/$non_exitent_var'}, {}, ['f1','f2'], []) |
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225 (set(['f1/$non_exitent_var']), {}, []) |
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226 """ |
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227 res_excludes = set(req_excludes) |
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228 res_excludes.update(repo_excludes) |
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229 invalid_includes = [] |
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230 if not req_includes: |
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231 res_includes = set(repo_includes) |
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232 elif 'path:.' not in repo_includes: |
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233 res_includes = [] |
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234 for req_include in req_includes: |
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235 req_include = util.expandpath(util.normpath(req_include)) |
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236 if req_include in repo_includes: |
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237 res_includes.append(req_include) |
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238 continue |
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239 valid = False |
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240 for repo_include in repo_includes: |
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241 if req_include.startswith(repo_include + '/'): |
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242 valid = True |
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243 res_includes.append(req_include) |
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244 break |
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245 if not valid: |
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246 invalid_includes.append(req_include) |
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247 if len(res_includes) == 0: |
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248 res_excludes = {'path:.'} |
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249 else: |
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250 res_includes = set(res_includes) |
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251 else: |
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252 res_includes = set(req_includes) |
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253 return res_includes, res_excludes, invalid_includes |
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254 |
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255 # These two are extracted for extensions (specifically for Google's CitC file |
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256 # system) |
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257 def _deletecleanfiles(repo, files): |
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258 for f in files: |
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259 repo.wvfs.unlinkpath(f) |
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260 |
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261 def _writeaddedfiles(repo, pctx, files): |
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262 actions = merge.emptyactions() |
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263 addgaction = actions[merge.ACTION_GET].append |
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264 mf = repo['.'].manifest() |
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265 for f in files: |
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266 if not repo.wvfs.exists(f): |
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267 addgaction((f, (mf.flags(f), False), "narrowspec updated")) |
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268 merge.applyupdates(repo, actions, wctx=repo[None], |
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269 mctx=repo['.'], overwrite=False) |
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270 |
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271 def checkworkingcopynarrowspec(repo): |
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272 storespec = repo.svfs.tryread(FILENAME) |
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273 wcspec = repo.vfs.tryread(DIRSTATE_FILENAME) |
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274 if wcspec != storespec: |
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275 raise error.Abort(_("working copy's narrowspec is stale"), |
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276 hint=_("run 'hg tracked --update-working-copy'")) |
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277 |
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278 def updateworkingcopy(repo, assumeclean=False): |
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279 """updates the working copy and dirstate from the store narrowspec |
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280 |
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281 When assumeclean=True, files that are not known to be clean will also |
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282 be deleted. It is then up to the caller to make sure they are clean. |
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283 """ |
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284 oldspec = repo.vfs.tryread(DIRSTATE_FILENAME) |
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285 newspec = repo.svfs.tryread(FILENAME) |
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286 |
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287 oldincludes, oldexcludes = parseconfig(repo.ui, oldspec) |
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288 newincludes, newexcludes = parseconfig(repo.ui, newspec) |
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289 oldmatch = match(repo.root, include=oldincludes, exclude=oldexcludes) |
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290 newmatch = match(repo.root, include=newincludes, exclude=newexcludes) |
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291 addedmatch = matchmod.differencematcher(newmatch, oldmatch) |
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292 removedmatch = matchmod.differencematcher(oldmatch, newmatch) |
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293 |
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294 ds = repo.dirstate |
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295 lookup, status = ds.status(removedmatch, subrepos=[], ignored=False, |
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296 clean=True, unknown=False) |
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297 trackeddirty = status.modified + status.added |
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298 clean = status.clean |
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299 if assumeclean: |
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300 assert not trackeddirty |
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301 clean.extend(lookup) |
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302 else: |
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303 trackeddirty.extend(lookup) |
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304 _deletecleanfiles(repo, clean) |
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305 for f in sorted(trackeddirty): |
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306 repo.ui.status(_('not deleting possibly dirty file %s\n') % f) |
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307 for f in clean + trackeddirty: |
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308 ds.drop(f) |
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309 |
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310 repo.narrowpats = newincludes, newexcludes |
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311 repo._narrowmatch = newmatch |
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312 pctx = repo['.'] |
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313 newfiles = [f for f in pctx.manifest().walk(addedmatch) if f not in ds] |
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314 for f in newfiles: |
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315 ds.normallookup(f) |
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316 _writeaddedfiles(repo, pctx, newfiles) |