Mercurial > hg-stable
annotate mercurial/narrowspec.py @ 39556:8d8e61df8259
narrowspec: validate patterns when loading and saving spec file
Patterns should be normalized and validated before being passed into
narrowspec.save(). Let's assert that by checking immediately before
writing the narrow spec file. And let's assert that patterns loaded
from the spec file also conform.
Differential Revision: https://phab.mercurial-scm.org/D4524
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Tue, 11 Sep 2018 15:28:41 -0700 |
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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 # Pattern prefixes that are allowed in narrow patterns. This list MUST |
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24 # only contain patterns that are fast and safe to evaluate. Keep in mind |
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25 # that patterns are supplied by clients and executed on remote servers |
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26 # as part of wire protocol commands. |
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27 VALID_PREFIXES = ( |
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28 b'path:', |
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29 b'rootfilesin:', |
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30 ) |
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31 |
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32 def parseserverpatterns(text): |
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33 """Parses the narrowspec format that's returned by the server.""" |
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34 includepats = set() |
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35 excludepats = set() |
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36 |
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37 # We get one entry per line, in the format "<key> <value>". |
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38 # It's OK for value to contain other spaces. |
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39 for kp in (l.split(' ', 1) for l in text.splitlines()): |
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40 if len(kp) != 2: |
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41 raise error.Abort(_('Invalid narrowspec pattern line: "%s"') % kp) |
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42 key = kp[0] |
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43 pat = kp[1] |
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44 if key == 'include': |
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45 includepats.add(pat) |
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46 elif key == 'exclude': |
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47 excludepats.add(pat) |
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48 else: |
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49 raise error.Abort(_('Invalid key "%s" in server response') % key) |
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50 |
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51 return includepats, excludepats |
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52 |
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53 def normalizesplitpattern(kind, pat): |
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54 """Returns the normalized version of a pattern and kind. |
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55 |
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56 Returns a tuple with the normalized kind and normalized pattern. |
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57 """ |
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58 pat = pat.rstrip('/') |
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59 _validatepattern(pat) |
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60 return kind, pat |
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61 |
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62 def _numlines(s): |
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63 """Returns the number of lines in s, including ending empty lines.""" |
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64 # We use splitlines because it is Unicode-friendly and thus Python 3 |
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65 # compatible. However, it does not count empty lines at the end, so trick |
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66 # it by adding a character at the end. |
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67 return len((s + 'x').splitlines()) |
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68 |
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69 def _validatepattern(pat): |
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70 """Validates the pattern and aborts if it is invalid. |
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71 |
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72 Patterns are stored in the narrowspec as newline-separated |
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73 POSIX-style bytestring paths. There's no escaping. |
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74 """ |
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75 |
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76 # We use newlines as separators in the narrowspec file, so don't allow them |
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77 # in patterns. |
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78 if _numlines(pat) > 1: |
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79 raise error.Abort(_('newlines are not allowed in narrowspec paths')) |
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80 |
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81 components = pat.split('/') |
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82 if '.' in components or '..' in components: |
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83 raise error.Abort(_('"." and ".." are not allowed in narrowspec paths')) |
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84 |
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85 def normalizepattern(pattern, defaultkind='path'): |
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86 """Returns the normalized version of a text-format pattern. |
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87 |
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88 If the pattern has no kind, the default will be added. |
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89 """ |
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90 kind, pat = matchmod._patsplit(pattern, defaultkind) |
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91 return '%s:%s' % normalizesplitpattern(kind, pat) |
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92 |
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93 def parsepatterns(pats): |
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94 """Parses an iterable of patterns into a typed pattern set. |
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95 |
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96 Patterns are assumed to be ``path:`` if no prefix is present. |
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97 For safety and performance reasons, only some prefixes are allowed. |
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98 See ``validatepatterns()``. |
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99 |
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100 This function should be used on patterns that come from the user to |
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101 normalize and validate them to the internal data structure used for |
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102 representing patterns. |
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103 """ |
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104 res = {normalizepattern(orig) for orig in pats} |
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105 validatepatterns(res) |
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106 return res |
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107 |
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108 def validatepatterns(pats): |
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109 """Validate that patterns are in the expected data structure and format. |
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110 |
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111 And that is a set of normalized patterns beginning with ``path:`` or |
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112 ``rootfilesin:``. |
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113 |
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114 This function should be used to validate internal data structures |
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115 and patterns that are loaded from sources that use the internal, |
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116 prefixed pattern representation (but can't necessarily be fully trusted). |
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117 """ |
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118 if not isinstance(pats, set): |
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119 raise error.ProgrammingError('narrow patterns should be a set; ' |
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120 'got %r' % pats) |
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121 |
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122 for pat in pats: |
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123 if not pat.startswith(VALID_PREFIXES): |
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124 # Use a Mercurial exception because this can happen due to user |
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125 # bugs (e.g. manually updating spec file). |
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126 raise error.Abort(_('invalid prefix on narrow pattern: %s') % pat, |
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127 hint=_('narrow patterns must begin with one of ' |
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128 'the following: %s') % |
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129 ', '.join(VALID_PREFIXES)) |
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130 |
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131 def format(includes, excludes): |
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132 output = '[include]\n' |
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133 for i in sorted(includes - excludes): |
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134 output += i + '\n' |
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135 output += '[exclude]\n' |
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136 for e in sorted(excludes): |
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137 output += e + '\n' |
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138 return output |
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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(root, '') |
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146 return matchmod.match(root, '', [], include=include or [], |
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147 exclude=exclude or []) |
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148 |
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149 def needsexpansion(includes): |
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150 return [i for i in includes if i.startswith('include:')] |
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151 |
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152 def load(repo): |
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153 try: |
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154 spec = repo.svfs.read(FILENAME) |
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155 except IOError as e: |
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156 # Treat "narrowspec does not exist" the same as "narrowspec file exists |
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157 # and is empty". |
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158 if e.errno == errno.ENOENT: |
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159 return set(), set() |
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160 raise |
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161 # maybe we should care about the profiles returned too |
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162 includepats, excludepats, profiles = sparse.parseconfig(repo.ui, spec, |
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163 'narrow') |
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164 if profiles: |
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165 raise error.Abort(_("including other spec files using '%include' is not" |
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166 " supported in narrowspec")) |
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167 |
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168 validatepatterns(includepats) |
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169 validatepatterns(excludepats) |
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170 |
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171 return includepats, excludepats |
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172 |
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173 def save(repo, includepats, excludepats): |
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174 validatepatterns(includepats) |
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175 validatepatterns(excludepats) |
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176 spec = format(includepats, excludepats) |
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177 repo.svfs.write(FILENAME, spec) |
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178 |
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179 def savebackup(repo, backupname): |
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180 if repository.NARROW_REQUIREMENT not in repo.requirements: |
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181 return |
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182 vfs = repo.vfs |
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183 vfs.tryunlink(backupname) |
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184 util.copyfile(repo.svfs.join(FILENAME), vfs.join(backupname), hardlink=True) |
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185 |
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186 def restorebackup(repo, backupname): |
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187 if repository.NARROW_REQUIREMENT not in repo.requirements: |
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188 return |
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189 util.rename(repo.vfs.join(backupname), repo.svfs.join(FILENAME)) |
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190 |
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191 def clearbackup(repo, backupname): |
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192 if repository.NARROW_REQUIREMENT not in repo.requirements: |
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193 return |
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194 repo.vfs.unlink(backupname) |
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195 |
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196 def restrictpatterns(req_includes, req_excludes, repo_includes, repo_excludes): |
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197 r""" Restricts the patterns according to repo settings, |
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198 results in a logical AND operation |
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199 |
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200 :param req_includes: requested includes |
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201 :param req_excludes: requested excludes |
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202 :param repo_includes: repo includes |
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203 :param repo_excludes: repo excludes |
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204 :return: include patterns, exclude patterns, and invalid include patterns. |
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205 |
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206 >>> restrictpatterns({'f1','f2'}, {}, ['f1'], []) |
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207 (set(['f1']), {}, []) |
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208 >>> restrictpatterns({'f1'}, {}, ['f1','f2'], []) |
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209 (set(['f1']), {}, []) |
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210 >>> restrictpatterns({'f1/fc1', 'f3/fc3'}, {}, ['f1','f2'], []) |
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211 (set(['f1/fc1']), {}, []) |
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212 >>> restrictpatterns({'f1_fc1'}, {}, ['f1','f2'], []) |
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213 ([], set(['path:.']), []) |
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214 >>> restrictpatterns({'f1/../f2/fc2'}, {}, ['f1','f2'], []) |
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215 (set(['f2/fc2']), {}, []) |
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216 >>> restrictpatterns({'f1/../f3/fc3'}, {}, ['f1','f2'], []) |
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217 ([], set(['path:.']), []) |
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218 >>> restrictpatterns({'f1/$non_exitent_var'}, {}, ['f1','f2'], []) |
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219 (set(['f1/$non_exitent_var']), {}, []) |
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220 """ |
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221 res_excludes = set(req_excludes) |
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222 res_excludes.update(repo_excludes) |
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223 invalid_includes = [] |
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224 if not req_includes: |
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225 res_includes = set(repo_includes) |
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226 elif 'path:.' not in repo_includes: |
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227 res_includes = [] |
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228 for req_include in req_includes: |
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229 req_include = util.expandpath(util.normpath(req_include)) |
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230 if req_include in repo_includes: |
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231 res_includes.append(req_include) |
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232 continue |
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233 valid = False |
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234 for repo_include in repo_includes: |
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235 if req_include.startswith(repo_include + '/'): |
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236 valid = True |
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237 res_includes.append(req_include) |
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238 break |
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239 if not valid: |
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240 invalid_includes.append(req_include) |
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241 if len(res_includes) == 0: |
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242 res_excludes = {'path:.'} |
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243 else: |
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244 res_includes = set(res_includes) |
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245 else: |
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246 res_includes = set(req_includes) |
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247 return res_includes, res_excludes, invalid_includes |