Mercurial > hg
annotate mercurial/narrowspec.py @ 47169:a13f72b9ccfb
revlog: move index reading logic in a dedicated method
They are multiple motivation to do it:
* The logic is complicated enough to deserver its own method.
* We will need to reuse this once we put a docket in use.
* This split the actual reading from the processing of the read data better.
Differential Revision: https://phab.mercurial-scm.org/D10595
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Mon, 03 May 2021 12:25:56 +0200 |
parents | ced66295ea90 |
children | e4ccc341e65b |
rev | line source |
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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 from .i18n import _ |
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11 from .pycompat import getattr |
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12 from . import ( |
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13 error, |
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14 match as matchmod, |
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15 merge, |
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16 mergestate as mergestatemod, |
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17 requirements, |
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18 scmutil, |
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19 sparse, |
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20 util, |
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21 ) |
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22 |
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23 # The file in .hg/store/ that indicates which paths exit in the store |
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24 FILENAME = b'narrowspec' |
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25 # The file in .hg/ that indicates which paths exit in the dirstate |
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26 DIRSTATE_FILENAME = b'narrowspec.dirstate' |
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27 |
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28 # Pattern prefixes that are allowed in narrow patterns. This list MUST |
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29 # only contain patterns that are fast and safe to evaluate. Keep in mind |
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30 # that patterns are supplied by clients and executed on remote servers |
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31 # as part of wire protocol commands. That means that changes to this |
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32 # data structure influence the wire protocol and should not be taken |
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33 # lightly - especially removals. |
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34 VALID_PREFIXES = ( |
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35 b'path:', |
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36 b'rootfilesin:', |
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37 ) |
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38 |
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39 |
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40 def normalizesplitpattern(kind, pat): |
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41 """Returns the normalized version of a pattern and kind. |
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42 |
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43 Returns a tuple with the normalized kind and normalized pattern. |
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44 """ |
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45 pat = pat.rstrip(b'/') |
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46 _validatepattern(pat) |
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47 return kind, pat |
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48 |
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49 |
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50 def _numlines(s): |
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51 """Returns the number of lines in s, including ending empty lines.""" |
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52 # We use splitlines because it is Unicode-friendly and thus Python 3 |
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53 # compatible. However, it does not count empty lines at the end, so trick |
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54 # it by adding a character at the end. |
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55 return len((s + b'x').splitlines()) |
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56 |
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57 |
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58 def _validatepattern(pat): |
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59 """Validates the pattern and aborts if it is invalid. |
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60 |
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61 Patterns are stored in the narrowspec as newline-separated |
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62 POSIX-style bytestring paths. There's no escaping. |
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63 """ |
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64 |
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65 # We use newlines as separators in the narrowspec file, so don't allow them |
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66 # in patterns. |
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67 if _numlines(pat) > 1: |
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68 raise error.Abort(_(b'newlines are not allowed in narrowspec paths')) |
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69 |
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70 components = pat.split(b'/') |
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71 if b'.' in components or b'..' in components: |
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72 raise error.Abort( |
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73 _(b'"." and ".." are not allowed in narrowspec paths') |
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74 ) |
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75 |
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76 |
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77 def normalizepattern(pattern, defaultkind=b'path'): |
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78 """Returns the normalized version of a text-format pattern. |
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79 |
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80 If the pattern has no kind, the default will be added. |
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81 """ |
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82 kind, pat = matchmod._patsplit(pattern, defaultkind) |
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83 return b'%s:%s' % normalizesplitpattern(kind, pat) |
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84 |
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85 |
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86 def parsepatterns(pats): |
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87 """Parses an iterable of patterns into a typed pattern set. |
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88 |
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89 Patterns are assumed to be ``path:`` if no prefix is present. |
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90 For safety and performance reasons, only some prefixes are allowed. |
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91 See ``validatepatterns()``. |
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92 |
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93 This function should be used on patterns that come from the user to |
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94 normalize and validate them to the internal data structure used for |
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95 representing patterns. |
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96 """ |
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97 res = {normalizepattern(orig) for orig in pats} |
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98 validatepatterns(res) |
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99 return res |
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100 |
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101 |
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102 def validatepatterns(pats): |
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103 """Validate that patterns are in the expected data structure and format. |
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104 |
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105 And that is a set of normalized patterns beginning with ``path:`` or |
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106 ``rootfilesin:``. |
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107 |
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108 This function should be used to validate internal data structures |
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109 and patterns that are loaded from sources that use the internal, |
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110 prefixed pattern representation (but can't necessarily be fully trusted). |
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111 """ |
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112 if not isinstance(pats, set): |
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113 raise error.ProgrammingError( |
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114 b'narrow patterns should be a set; got %r' % pats |
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115 ) |
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116 |
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117 for pat in pats: |
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118 if not pat.startswith(VALID_PREFIXES): |
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119 # Use a Mercurial exception because this can happen due to user |
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120 # bugs (e.g. manually updating spec file). |
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121 raise error.Abort( |
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122 _(b'invalid prefix on narrow pattern: %s') % pat, |
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123 hint=_( |
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124 b'narrow patterns must begin with one of ' |
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125 b'the following: %s' |
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126 ) |
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127 % b', '.join(VALID_PREFIXES), |
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128 ) |
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129 |
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130 |
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131 def format(includes, excludes): |
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132 output = b'[include]\n' |
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133 for i in sorted(includes - excludes): |
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134 output += i + b'\n' |
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135 output += b'[exclude]\n' |
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136 for e in sorted(excludes): |
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137 output += e + b'\n' |
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138 return output |
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139 |
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140 |
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141 def match(root, include=None, exclude=None): |
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142 if not include: |
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143 # Passing empty include and empty exclude to matchmod.match() |
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144 # gives a matcher that matches everything, so explicitly use |
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145 # the nevermatcher. |
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146 return matchmod.never() |
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147 return matchmod.match( |
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148 root, b'', [], include=include or [], exclude=exclude or [] |
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149 ) |
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150 |
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151 |
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152 def parseconfig(ui, spec): |
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153 # maybe we should care about the profiles returned too |
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154 includepats, excludepats, profiles = sparse.parseconfig(ui, spec, b'narrow') |
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155 if profiles: |
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156 raise error.Abort( |
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157 _( |
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158 b"including other spec files using '%include' is not" |
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159 b" supported in narrowspec" |
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160 ) |
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161 ) |
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162 |
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163 validatepatterns(includepats) |
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164 validatepatterns(excludepats) |
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165 |
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166 return includepats, excludepats |
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167 |
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168 |
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169 def load(repo): |
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170 # Treat "narrowspec does not exist" the same as "narrowspec file exists |
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171 # and is empty". |
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172 spec = repo.svfs.tryread(FILENAME) |
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173 return parseconfig(repo.ui, spec) |
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174 |
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175 |
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176 def save(repo, includepats, excludepats): |
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177 validatepatterns(includepats) |
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178 validatepatterns(excludepats) |
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179 spec = format(includepats, excludepats) |
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180 repo.svfs.write(FILENAME, spec) |
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181 |
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182 |
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183 def copytoworkingcopy(repo): |
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184 spec = repo.svfs.read(FILENAME) |
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185 repo.vfs.write(DIRSTATE_FILENAME, spec) |
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186 |
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187 |
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188 def savebackup(repo, backupname): |
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189 if requirements.NARROW_REQUIREMENT not in repo.requirements: |
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190 return |
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191 svfs = repo.svfs |
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192 svfs.tryunlink(backupname) |
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193 util.copyfile(svfs.join(FILENAME), svfs.join(backupname), hardlink=True) |
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194 |
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195 |
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196 def restorebackup(repo, backupname): |
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197 if requirements.NARROW_REQUIREMENT not in repo.requirements: |
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198 return |
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199 util.rename(repo.svfs.join(backupname), repo.svfs.join(FILENAME)) |
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200 |
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201 |
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202 def savewcbackup(repo, backupname): |
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203 if requirements.NARROW_REQUIREMENT not in repo.requirements: |
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204 return |
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205 vfs = repo.vfs |
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206 vfs.tryunlink(backupname) |
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207 # It may not exist in old repos |
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208 if vfs.exists(DIRSTATE_FILENAME): |
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209 util.copyfile( |
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210 vfs.join(DIRSTATE_FILENAME), vfs.join(backupname), hardlink=True |
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211 ) |
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212 |
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213 |
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214 def restorewcbackup(repo, backupname): |
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215 if requirements.NARROW_REQUIREMENT not in repo.requirements: |
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216 return |
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217 # It may not exist in old repos |
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218 if repo.vfs.exists(backupname): |
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219 util.rename(repo.vfs.join(backupname), repo.vfs.join(DIRSTATE_FILENAME)) |
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220 |
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221 |
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222 def clearwcbackup(repo, backupname): |
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223 if requirements.NARROW_REQUIREMENT not in repo.requirements: |
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224 return |
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225 repo.vfs.tryunlink(backupname) |
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226 |
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227 |
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228 def restrictpatterns(req_includes, req_excludes, repo_includes, repo_excludes): |
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229 r"""Restricts the patterns according to repo settings, |
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230 results in a logical AND operation |
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231 |
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232 :param req_includes: requested includes |
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233 :param req_excludes: requested excludes |
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234 :param repo_includes: repo includes |
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235 :param repo_excludes: repo excludes |
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236 :return: include patterns, exclude patterns, and invalid include patterns. |
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237 """ |
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238 res_excludes = set(req_excludes) |
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239 res_excludes.update(repo_excludes) |
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240 invalid_includes = [] |
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241 if not req_includes: |
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242 res_includes = set(repo_includes) |
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243 elif b'path:.' not in repo_includes: |
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244 res_includes = [] |
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245 for req_include in req_includes: |
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246 req_include = util.expandpath(util.normpath(req_include)) |
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247 if req_include in repo_includes: |
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248 res_includes.append(req_include) |
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249 continue |
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250 valid = False |
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251 for repo_include in repo_includes: |
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252 if req_include.startswith(repo_include + b'/'): |
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253 valid = True |
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254 res_includes.append(req_include) |
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255 break |
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256 if not valid: |
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257 invalid_includes.append(req_include) |
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258 if len(res_includes) == 0: |
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259 res_excludes = {b'path:.'} |
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260 else: |
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261 res_includes = set(res_includes) |
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262 else: |
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263 res_includes = set(req_includes) |
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264 return res_includes, res_excludes, invalid_includes |
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265 |
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266 |
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267 # These two are extracted for extensions (specifically for Google's CitC file |
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268 # system) |
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269 def _deletecleanfiles(repo, files): |
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270 for f in files: |
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271 repo.wvfs.unlinkpath(f) |
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272 |
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273 |
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274 def _writeaddedfiles(repo, pctx, files): |
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275 mresult = merge.mergeresult() |
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276 mf = repo[b'.'].manifest() |
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277 for f in files: |
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278 if not repo.wvfs.exists(f): |
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279 mresult.addfile( |
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280 f, |
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281 mergestatemod.ACTION_GET, |
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282 (mf.flags(f), False), |
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283 b"narrowspec updated", |
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284 ) |
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285 merge.applyupdates( |
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286 repo, |
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287 mresult, |
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288 wctx=repo[None], |
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289 mctx=repo[b'.'], |
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290 overwrite=False, |
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291 wantfiledata=False, |
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292 ) |
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293 |
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294 |
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295 def checkworkingcopynarrowspec(repo): |
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296 # Avoid infinite recursion when updating the working copy |
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297 if getattr(repo, '_updatingnarrowspec', False): |
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298 return |
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299 storespec = repo.svfs.tryread(FILENAME) |
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300 wcspec = repo.vfs.tryread(DIRSTATE_FILENAME) |
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301 if wcspec != storespec: |
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302 raise error.Abort( |
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303 _(b"working copy's narrowspec is stale"), |
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304 hint=_(b"run 'hg tracked --update-working-copy'"), |
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305 ) |
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306 |
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307 |
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308 def updateworkingcopy(repo, assumeclean=False): |
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309 """updates the working copy and dirstate from the store narrowspec |
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310 |
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311 When assumeclean=True, files that are not known to be clean will also |
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312 be deleted. It is then up to the caller to make sure they are clean. |
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313 """ |
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314 oldspec = repo.vfs.tryread(DIRSTATE_FILENAME) |
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315 newspec = repo.svfs.tryread(FILENAME) |
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316 repo._updatingnarrowspec = True |
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317 |
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318 oldincludes, oldexcludes = parseconfig(repo.ui, oldspec) |
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319 newincludes, newexcludes = parseconfig(repo.ui, newspec) |
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320 oldmatch = match(repo.root, include=oldincludes, exclude=oldexcludes) |
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321 newmatch = match(repo.root, include=newincludes, exclude=newexcludes) |
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322 addedmatch = matchmod.differencematcher(newmatch, oldmatch) |
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323 removedmatch = matchmod.differencematcher(oldmatch, newmatch) |
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324 |
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325 ds = repo.dirstate |
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326 lookup, status = ds.status( |
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327 removedmatch, subrepos=[], ignored=True, clean=True, unknown=True |
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328 ) |
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329 trackeddirty = status.modified + status.added |
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330 clean = status.clean |
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331 if assumeclean: |
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332 clean.extend(lookup) |
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333 else: |
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334 trackeddirty.extend(lookup) |
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335 _deletecleanfiles(repo, clean) |
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336 uipathfn = scmutil.getuipathfn(repo) |
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337 for f in sorted(trackeddirty): |
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338 repo.ui.status( |
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339 _(b'not deleting possibly dirty file %s\n') % uipathfn(f) |
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340 ) |
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341 for f in sorted(status.unknown): |
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342 repo.ui.status(_(b'not deleting unknown file %s\n') % uipathfn(f)) |
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343 for f in sorted(status.ignored): |
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344 repo.ui.status(_(b'not deleting ignored file %s\n') % uipathfn(f)) |
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345 for f in clean + trackeddirty: |
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346 ds.drop(f) |
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347 |
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348 pctx = repo[b'.'] |
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349 newfiles = [f for f in pctx.manifest().walk(addedmatch) if f not in ds] |
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350 for f in newfiles: |
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351 ds.normallookup(f) |
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352 _writeaddedfiles(repo, pctx, newfiles) |
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353 repo._updatingnarrowspec = False |