Mercurial > hg
annotate mercurial/narrowspec.py @ 44712:a825bfbf6642
templatekw: cache mergestate even if merge is not ongoing
While playing with eBPF, I noticed .hg/merge/state{,2} files were tried
to open() for each revision. That's not healthy. Let's cache the "inactive"
state as well.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Wed, 15 Apr 2020 23:11:55 +0900 |
parents | 1922694d638f |
children | b7808443ed6a |
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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 .interfaces import repository |
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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 scmutil, |
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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 = b'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 = b'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 |
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39 def normalizesplitpattern(kind, pat): |
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40 """Returns the normalized version of a pattern and kind. |
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41 |
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42 Returns a tuple with the normalized kind and normalized pattern. |
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43 """ |
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44 pat = pat.rstrip(b'/') |
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45 _validatepattern(pat) |
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46 return kind, pat |
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47 |
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48 |
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49 def _numlines(s): |
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50 """Returns the number of lines in s, including ending empty lines.""" |
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51 # We use splitlines because it is Unicode-friendly and thus Python 3 |
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52 # compatible. However, it does not count empty lines at the end, so trick |
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53 # it by adding a character at the end. |
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54 return len((s + b'x').splitlines()) |
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55 |
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56 |
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57 def _validatepattern(pat): |
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58 """Validates the pattern and aborts if it is invalid. |
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59 |
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60 Patterns are stored in the narrowspec as newline-separated |
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61 POSIX-style bytestring paths. There's no escaping. |
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62 """ |
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63 |
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64 # We use newlines as separators in the narrowspec file, so don't allow them |
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65 # in patterns. |
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66 if _numlines(pat) > 1: |
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67 raise error.Abort(_(b'newlines are not allowed in narrowspec paths')) |
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68 |
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69 components = pat.split(b'/') |
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70 if b'.' in components or b'..' in components: |
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71 raise error.Abort( |
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72 _(b'"." and ".." are not allowed in narrowspec paths') |
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73 ) |
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74 |
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75 |
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76 def normalizepattern(pattern, defaultkind=b'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 b'%s:%s' % normalizesplitpattern(kind, pat) |
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83 |
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84 |
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85 def parsepatterns(pats): |
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86 """Parses an iterable of patterns into a typed pattern set. |
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87 |
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88 Patterns are assumed to be ``path:`` if no prefix is present. |
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89 For safety and performance reasons, only some prefixes are allowed. |
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90 See ``validatepatterns()``. |
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91 |
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92 This function should be used on patterns that come from the user to |
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93 normalize and validate them to the internal data structure used for |
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94 representing patterns. |
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95 """ |
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96 res = {normalizepattern(orig) for orig in pats} |
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97 validatepatterns(res) |
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98 return res |
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99 |
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100 |
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101 def validatepatterns(pats): |
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102 """Validate that patterns are in the expected data structure and format. |
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103 |
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104 And that is a set of normalized patterns beginning with ``path:`` or |
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105 ``rootfilesin:``. |
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106 |
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107 This function should be used to validate internal data structures |
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108 and patterns that are loaded from sources that use the internal, |
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109 prefixed pattern representation (but can't necessarily be fully trusted). |
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110 """ |
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111 if not isinstance(pats, set): |
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112 raise error.ProgrammingError( |
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113 b'narrow patterns should be a set; got %r' % pats |
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114 ) |
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115 |
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116 for pat in pats: |
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117 if not pat.startswith(VALID_PREFIXES): |
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118 # Use a Mercurial exception because this can happen due to user |
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119 # bugs (e.g. manually updating spec file). |
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120 raise error.Abort( |
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121 _(b'invalid prefix on narrow pattern: %s') % pat, |
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122 hint=_( |
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123 b'narrow patterns must begin with one of ' |
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124 b'the following: %s' |
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125 ) |
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126 % b', '.join(VALID_PREFIXES), |
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127 ) |
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128 |
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129 |
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130 def format(includes, excludes): |
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131 output = b'[include]\n' |
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132 for i in sorted(includes - excludes): |
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133 output += i + b'\n' |
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134 output += b'[exclude]\n' |
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135 for e in sorted(excludes): |
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136 output += e + b'\n' |
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137 return output |
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138 |
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139 |
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140 def match(root, include=None, exclude=None): |
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141 if not include: |
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142 # Passing empty include and empty exclude to matchmod.match() |
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143 # gives a matcher that matches everything, so explicitly use |
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144 # the nevermatcher. |
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145 return matchmod.never() |
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146 return matchmod.match( |
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147 root, b'', [], include=include or [], exclude=exclude or [] |
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148 ) |
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149 |
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150 |
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151 def parseconfig(ui, spec): |
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152 # maybe we should care about the profiles returned too |
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153 includepats, excludepats, profiles = sparse.parseconfig(ui, spec, b'narrow') |
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154 if profiles: |
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155 raise error.Abort( |
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156 _( |
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157 b"including other spec files using '%include' is not" |
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158 b" supported in narrowspec" |
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159 ) |
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160 ) |
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161 |
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162 validatepatterns(includepats) |
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163 validatepatterns(excludepats) |
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164 |
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165 return includepats, excludepats |
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166 |
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167 |
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168 def load(repo): |
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169 # Treat "narrowspec does not exist" the same as "narrowspec file exists |
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170 # and is empty". |
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171 spec = repo.svfs.tryread(FILENAME) |
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172 return parseconfig(repo.ui, spec) |
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173 |
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174 |
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175 def save(repo, includepats, excludepats): |
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176 validatepatterns(includepats) |
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177 validatepatterns(excludepats) |
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178 spec = format(includepats, excludepats) |
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179 repo.svfs.write(FILENAME, spec) |
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180 |
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181 |
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182 def copytoworkingcopy(repo): |
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183 spec = repo.svfs.read(FILENAME) |
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184 repo.vfs.write(DIRSTATE_FILENAME, spec) |
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185 |
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186 |
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187 def savebackup(repo, backupname): |
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188 if repository.NARROW_REQUIREMENT not in repo.requirements: |
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189 return |
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190 svfs = repo.svfs |
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191 svfs.tryunlink(backupname) |
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192 util.copyfile(svfs.join(FILENAME), svfs.join(backupname), hardlink=True) |
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193 |
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194 |
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195 def restorebackup(repo, backupname): |
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196 if repository.NARROW_REQUIREMENT not in repo.requirements: |
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197 return |
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198 util.rename(repo.svfs.join(backupname), repo.svfs.join(FILENAME)) |
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199 |
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200 |
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201 def savewcbackup(repo, backupname): |
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202 if repository.NARROW_REQUIREMENT not in repo.requirements: |
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203 return |
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204 vfs = repo.vfs |
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205 vfs.tryunlink(backupname) |
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206 # It may not exist in old repos |
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207 if vfs.exists(DIRSTATE_FILENAME): |
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208 util.copyfile( |
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209 vfs.join(DIRSTATE_FILENAME), vfs.join(backupname), hardlink=True |
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210 ) |
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211 |
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212 |
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213 def restorewcbackup(repo, backupname): |
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214 if repository.NARROW_REQUIREMENT not in repo.requirements: |
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215 return |
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216 # It may not exist in old repos |
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217 if repo.vfs.exists(backupname): |
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218 util.rename(repo.vfs.join(backupname), repo.vfs.join(DIRSTATE_FILENAME)) |
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219 |
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220 |
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221 def clearwcbackup(repo, backupname): |
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222 if repository.NARROW_REQUIREMENT not in repo.requirements: |
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223 return |
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224 repo.vfs.tryunlink(backupname) |
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225 |
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226 |
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227 def restrictpatterns(req_includes, req_excludes, repo_includes, repo_excludes): |
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228 r""" Restricts the patterns according to repo settings, |
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229 results in a logical AND operation |
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230 |
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231 :param req_includes: requested includes |
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232 :param req_excludes: requested excludes |
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233 :param repo_includes: repo includes |
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234 :param repo_excludes: repo excludes |
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235 :return: include patterns, exclude patterns, and invalid include patterns. |
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236 """ |
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237 res_excludes = set(req_excludes) |
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238 res_excludes.update(repo_excludes) |
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239 invalid_includes = [] |
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240 if not req_includes: |
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241 res_includes = set(repo_includes) |
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242 elif b'path:.' not in repo_includes: |
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243 res_includes = [] |
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244 for req_include in req_includes: |
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245 req_include = util.expandpath(util.normpath(req_include)) |
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246 if req_include in repo_includes: |
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247 res_includes.append(req_include) |
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248 continue |
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249 valid = False |
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250 for repo_include in repo_includes: |
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251 if req_include.startswith(repo_include + b'/'): |
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252 valid = True |
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253 res_includes.append(req_include) |
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254 break |
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255 if not valid: |
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256 invalid_includes.append(req_include) |
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257 if len(res_includes) == 0: |
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258 res_excludes = {b'path:.'} |
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259 else: |
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260 res_includes = set(res_includes) |
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261 else: |
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262 res_includes = set(req_includes) |
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263 return res_includes, res_excludes, invalid_includes |
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264 |
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265 |
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266 # These two are extracted for extensions (specifically for Google's CitC file |
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267 # system) |
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268 def _deletecleanfiles(repo, files): |
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269 for f in files: |
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270 repo.wvfs.unlinkpath(f) |
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271 |
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272 |
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273 def _writeaddedfiles(repo, pctx, files): |
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274 actions = merge.emptyactions() |
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275 addgaction = actions[merge.ACTION_GET].append |
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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 addgaction((f, (mf.flags(f), False), b"narrowspec updated")) |
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280 merge.applyupdates( |
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281 repo, |
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282 actions, |
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283 wctx=repo[None], |
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284 mctx=repo[b'.'], |
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285 overwrite=False, |
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286 wantfiledata=False, |
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287 ) |
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288 |
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289 |
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290 def checkworkingcopynarrowspec(repo): |
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291 # Avoid infinite recursion when updating the working copy |
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292 if getattr(repo, '_updatingnarrowspec', False): |
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293 return |
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294 storespec = repo.svfs.tryread(FILENAME) |
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295 wcspec = repo.vfs.tryread(DIRSTATE_FILENAME) |
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296 if wcspec != storespec: |
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297 raise error.Abort( |
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298 _(b"working copy's narrowspec is stale"), |
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299 hint=_(b"run 'hg tracked --update-working-copy'"), |
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300 ) |
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301 |
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302 |
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303 def updateworkingcopy(repo, assumeclean=False): |
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304 """updates the working copy and dirstate from the store narrowspec |
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305 |
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306 When assumeclean=True, files that are not known to be clean will also |
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307 be deleted. It is then up to the caller to make sure they are clean. |
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308 """ |
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309 oldspec = repo.vfs.tryread(DIRSTATE_FILENAME) |
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310 newspec = repo.svfs.tryread(FILENAME) |
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311 repo._updatingnarrowspec = True |
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312 |
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313 oldincludes, oldexcludes = parseconfig(repo.ui, oldspec) |
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314 newincludes, newexcludes = parseconfig(repo.ui, newspec) |
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315 oldmatch = match(repo.root, include=oldincludes, exclude=oldexcludes) |
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316 newmatch = match(repo.root, include=newincludes, exclude=newexcludes) |
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317 addedmatch = matchmod.differencematcher(newmatch, oldmatch) |
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318 removedmatch = matchmod.differencematcher(oldmatch, newmatch) |
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319 |
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320 ds = repo.dirstate |
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321 lookup, status = ds.status( |
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322 removedmatch, subrepos=[], ignored=True, clean=True, unknown=True |
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323 ) |
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324 trackeddirty = status.modified + status.added |
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325 clean = status.clean |
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326 if assumeclean: |
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327 assert not trackeddirty |
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328 clean.extend(lookup) |
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329 else: |
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330 trackeddirty.extend(lookup) |
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331 _deletecleanfiles(repo, clean) |
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332 uipathfn = scmutil.getuipathfn(repo) |
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333 for f in sorted(trackeddirty): |
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334 repo.ui.status( |
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335 _(b'not deleting possibly dirty file %s\n') % uipathfn(f) |
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336 ) |
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337 for f in sorted(status.unknown): |
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338 repo.ui.status(_(b'not deleting unknown file %s\n') % uipathfn(f)) |
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339 for f in sorted(status.ignored): |
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340 repo.ui.status(_(b'not deleting ignored file %s\n') % uipathfn(f)) |
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341 for f in clean + trackeddirty: |
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342 ds.drop(f) |
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343 |
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344 pctx = repo[b'.'] |
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345 newfiles = [f for f in pctx.manifest().walk(addedmatch) if f not in ds] |
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346 for f in newfiles: |
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347 ds.normallookup(f) |
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348 _writeaddedfiles(repo, pctx, newfiles) |
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349 repo._updatingnarrowspec = False |