Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/narrowspec.py @ 39883:3e896b51aa5d

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storageutil: move metadata parsing and packing from revlog (API) Parsing and writing of revision text metadata is likely identical across storage backends. Let's move the code out of revlog so we don't need to import the revlog module in order to use it. Differential Revision: https://phab.mercurial-scm.org/D4754
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 24 Sep 2018 14:31:31 -0700
parents ae20f52437e9
children efd0f79246e3
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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. That means that changes to this
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27 # data structure influence the wire protocol and should not be taken
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28 # lightly - especially removals.
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29 VALID_PREFIXES = (
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30 b'path:',
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31 b'rootfilesin:',
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32 )
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33
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34 def normalizesplitpattern(kind, pat):
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35 """Returns the normalized version of a pattern and kind.
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36
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37 Returns a tuple with the normalized kind and normalized pattern.
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38 """
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39 pat = pat.rstrip('/')
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40 _validatepattern(pat)
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41 return kind, pat
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42
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43 def _numlines(s):
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44 """Returns the number of lines in s, including ending empty lines."""
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45 # We use splitlines because it is Unicode-friendly and thus Python 3
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46 # compatible. However, it does not count empty lines at the end, so trick
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47 # it by adding a character at the end.
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48 return len((s + 'x').splitlines())
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49
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50 def _validatepattern(pat):
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51 """Validates the pattern and aborts if it is invalid.
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52
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53 Patterns are stored in the narrowspec as newline-separated
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54 POSIX-style bytestring paths. There's no escaping.
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55 """
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56
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57 # We use newlines as separators in the narrowspec file, so don't allow them
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58 # in patterns.
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59 if _numlines(pat) > 1:
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60 raise error.Abort(_('newlines are not allowed in narrowspec paths'))
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61
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62 components = pat.split('/')
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63 if '.' in components or '..' in components:
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64 raise error.Abort(_('"." and ".." are not allowed in narrowspec paths'))
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65
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66 def normalizepattern(pattern, defaultkind='path'):
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67 """Returns the normalized version of a text-format pattern.
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68
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69 If the pattern has no kind, the default will be added.
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70 """
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71 kind, pat = matchmod._patsplit(pattern, defaultkind)
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72 return '%s:%s' % normalizesplitpattern(kind, pat)
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73
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74 def parsepatterns(pats):
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75 """Parses an iterable of patterns into a typed pattern set.
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76
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77 Patterns are assumed to be ``path:`` if no prefix is present.
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78 For safety and performance reasons, only some prefixes are allowed.
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79 See ``validatepatterns()``.
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80
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81 This function should be used on patterns that come from the user to
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82 normalize and validate them to the internal data structure used for
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83 representing patterns.
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84 """
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85 res = {normalizepattern(orig) for orig in pats}
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86 validatepatterns(res)
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87 return res
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88
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89 def validatepatterns(pats):
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90 """Validate that patterns are in the expected data structure and format.
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91
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92 And that is a set of normalized patterns beginning with ``path:`` or
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93 ``rootfilesin:``.
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94
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95 This function should be used to validate internal data structures
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96 and patterns that are loaded from sources that use the internal,
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97 prefixed pattern representation (but can't necessarily be fully trusted).
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98 """
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99 if not isinstance(pats, set):
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100 raise error.ProgrammingError('narrow patterns should be a set; '
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101 'got %r' % pats)
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102
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103 for pat in pats:
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104 if not pat.startswith(VALID_PREFIXES):
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105 # Use a Mercurial exception because this can happen due to user
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106 # bugs (e.g. manually updating spec file).
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107 raise error.Abort(_('invalid prefix on narrow pattern: %s') % pat,
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108 hint=_('narrow patterns must begin with one of '
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109 'the following: %s') %
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110 ', '.join(VALID_PREFIXES))
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111
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112 def format(includes, excludes):
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113 output = '[include]\n'
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114 for i in sorted(includes - excludes):
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115 output += i + '\n'
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116 output += '[exclude]\n'
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117 for e in sorted(excludes):
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118 output += e + '\n'
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119 return output
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120
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121 def match(root, include=None, exclude=None):
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122 if not include:
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123 # Passing empty include and empty exclude to matchmod.match()
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124 # gives a matcher that matches everything, so explicitly use
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125 # the nevermatcher.
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126 return matchmod.never(root, '')
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127 return matchmod.match(root, '', [], include=include or [],
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128 exclude=exclude or [])
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129
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130 def load(repo):
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131 try:
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132 spec = repo.svfs.read(FILENAME)
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133 except IOError as e:
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134 # Treat "narrowspec does not exist" the same as "narrowspec file exists
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135 # and is empty".
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136 if e.errno == errno.ENOENT:
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137 return set(), set()
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138 raise
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139 # maybe we should care about the profiles returned too
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140 includepats, excludepats, profiles = sparse.parseconfig(repo.ui, spec,
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141 'narrow')
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142 if profiles:
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143 raise error.Abort(_("including other spec files using '%include' is not"
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144 " supported in narrowspec"))
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145
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146 validatepatterns(includepats)
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147 validatepatterns(excludepats)
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148
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149 return includepats, excludepats
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150
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151 def save(repo, includepats, excludepats):
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152 validatepatterns(includepats)
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153 validatepatterns(excludepats)
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154 spec = format(includepats, excludepats)
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155 repo.svfs.write(FILENAME, spec)
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156
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157 def savebackup(repo, backupname):
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158 if repository.NARROW_REQUIREMENT not in repo.requirements:
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159 return
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160 vfs = repo.vfs
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161 vfs.tryunlink(backupname)
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162 util.copyfile(repo.svfs.join(FILENAME), vfs.join(backupname), hardlink=True)
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163
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164 def restorebackup(repo, backupname):
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165 if repository.NARROW_REQUIREMENT not in repo.requirements:
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166 return
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167 util.rename(repo.vfs.join(backupname), repo.svfs.join(FILENAME))
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168
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169 def clearbackup(repo, backupname):
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170 if repository.NARROW_REQUIREMENT not in repo.requirements:
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171 return
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172 repo.vfs.unlink(backupname)
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173
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174 def restrictpatterns(req_includes, req_excludes, repo_includes, repo_excludes):
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175 r""" Restricts the patterns according to repo settings,
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176 results in a logical AND operation
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177
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178 :param req_includes: requested includes
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179 :param req_excludes: requested excludes
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180 :param repo_includes: repo includes
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181 :param repo_excludes: repo excludes
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182 :return: include patterns, exclude patterns, and invalid include patterns.
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183
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184 >>> restrictpatterns({'f1','f2'}, {}, ['f1'], [])
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185 (set(['f1']), {}, [])
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186 >>> restrictpatterns({'f1'}, {}, ['f1','f2'], [])
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187 (set(['f1']), {}, [])
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188 >>> restrictpatterns({'f1/fc1', 'f3/fc3'}, {}, ['f1','f2'], [])
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189 (set(['f1/fc1']), {}, [])
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190 >>> restrictpatterns({'f1_fc1'}, {}, ['f1','f2'], [])
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191 ([], set(['path:.']), [])
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192 >>> restrictpatterns({'f1/../f2/fc2'}, {}, ['f1','f2'], [])
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193 (set(['f2/fc2']), {}, [])
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194 >>> restrictpatterns({'f1/../f3/fc3'}, {}, ['f1','f2'], [])
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195 ([], set(['path:.']), [])
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196 >>> restrictpatterns({'f1/$non_exitent_var'}, {}, ['f1','f2'], [])
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197 (set(['f1/$non_exitent_var']), {}, [])
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198 """
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199 res_excludes = set(req_excludes)
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200 res_excludes.update(repo_excludes)
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201 invalid_includes = []
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202 if not req_includes:
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203 res_includes = set(repo_includes)
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204 elif 'path:.' not in repo_includes:
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205 res_includes = []
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206 for req_include in req_includes:
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207 req_include = util.expandpath(util.normpath(req_include))
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208 if req_include in repo_includes:
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209 res_includes.append(req_include)
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210 continue
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211 valid = False
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212 for repo_include in repo_includes:
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213 if req_include.startswith(repo_include + '/'):
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214 valid = True
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215 res_includes.append(req_include)
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216 break
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217 if not valid:
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218 invalid_includes.append(req_include)
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219 if len(res_includes) == 0:
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220 res_excludes = {'path:.'}
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221 else:
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222 res_includes = set(res_includes)
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223 else:
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224 res_includes = set(req_includes)
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225 return res_includes, res_excludes, invalid_includes