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annotate mercurial/narrowspec.py @ 38869:ad24b581e4d9

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narrow: call narrowspec.{save,restore,clear}backup directly I want to move .hg/narrowspec to .hg/store/narrowspec and we need to decouple the narrowspec update from the dirstate update for that. This patch lets the callers call the narrowspec backup functions directly, in addition to the dirstate backup functions. The narrowspec methods are made to check if narrowing is enabled. For that, a repo instance was needed, which all the callers luckily already had available. Differential Revision: https://phab.mercurial-scm.org/D4096
author Martin von Zweigbergk <martinvonz@google.com>
date Fri, 03 Aug 2018 11:09:41 -0700
parents 794afa91f0a5
children ae2962bb56a3
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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 def parseserverpatterns(text):
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24 """Parses the narrowspec format that's returned by the server."""
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25 includepats = set()
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26 excludepats = set()
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27
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28 # We get one entry per line, in the format "<key> <value>".
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29 # It's OK for value to contain other spaces.
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30 for kp in (l.split(' ', 1) for l in text.splitlines()):
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31 if len(kp) != 2:
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32 raise error.Abort(_('Invalid narrowspec pattern line: "%s"') % kp)
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33 key = kp[0]
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34 pat = kp[1]
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35 if key == 'include':
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36 includepats.add(pat)
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37 elif key == 'exclude':
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38 excludepats.add(pat)
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39 else:
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40 raise error.Abort(_('Invalid key "%s" in server response') % key)
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41
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42 return includepats, excludepats
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43
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44 def normalizesplitpattern(kind, pat):
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45 """Returns the normalized version of a pattern and kind.
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46
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47 Returns a tuple with the normalized kind and normalized pattern.
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48 """
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49 pat = pat.rstrip('/')
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50 _validatepattern(pat)
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51 return kind, pat
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52
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53 def _numlines(s):
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54 """Returns the number of lines in s, including ending empty lines."""
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55 # We use splitlines because it is Unicode-friendly and thus Python 3
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56 # compatible. However, it does not count empty lines at the end, so trick
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57 # it by adding a character at the end.
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58 return len((s + 'x').splitlines())
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59
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60 def _validatepattern(pat):
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61 """Validates the pattern and aborts if it is invalid.
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62
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63 Patterns are stored in the narrowspec as newline-separated
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64 POSIX-style bytestring paths. There's no escaping.
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65 """
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66
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67 # We use newlines as separators in the narrowspec file, so don't allow them
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68 # in patterns.
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69 if _numlines(pat) > 1:
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70 raise error.Abort(_('newlines are not allowed in narrowspec paths'))
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71
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72 components = pat.split('/')
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73 if '.' in components or '..' in components:
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74 raise error.Abort(_('"." and ".." are not allowed in narrowspec paths'))
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75
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76 def normalizepattern(pattern, defaultkind='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 '%s:%s' % normalizesplitpattern(kind, pat)
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83
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84 def parsepatterns(pats):
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85 """Parses a list of patterns into a typed pattern set."""
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86 return set(normalizepattern(p) for p in pats)
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87
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88 def format(includes, excludes):
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89 output = '[include]\n'
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90 for i in sorted(includes - excludes):
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91 output += i + '\n'
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92 output += '[exclude]\n'
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93 for e in sorted(excludes):
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94 output += e + '\n'
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95 return output
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96
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97 def match(root, include=None, exclude=None):
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98 if not include:
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99 # Passing empty include and empty exclude to matchmod.match()
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100 # gives a matcher that matches everything, so explicitly use
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101 # the nevermatcher.
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102 return matchmod.never(root, '')
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103 return matchmod.match(root, '', [], include=include or [],
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104 exclude=exclude or [])
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105
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106 def needsexpansion(includes):
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107 return [i for i in includes if i.startswith('include:')]
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108
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109 def load(repo):
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110 try:
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111 spec = repo.vfs.read(FILENAME)
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112 except IOError as e:
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113 # Treat "narrowspec does not exist" the same as "narrowspec file exists
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114 # and is empty".
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115 if e.errno == errno.ENOENT:
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116 # Without this the next call to load will use the cached
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117 # non-existence of the file, which can cause some odd issues.
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118 repo.invalidate(clearfilecache=True)
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119 return set(), set()
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120 raise
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121 # maybe we should care about the profiles returned too
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122 includepats, excludepats, profiles = sparse.parseconfig(repo.ui, spec,
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123 'narrow')
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124 if profiles:
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125 raise error.Abort(_("including other spec files using '%include' is not"
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126 " suported in narrowspec"))
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127 return includepats, excludepats
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128
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129 def save(repo, includepats, excludepats):
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130 spec = format(includepats, excludepats)
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131 repo.vfs.write(FILENAME, spec)
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132
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133 def savebackup(repo, backupname):
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134 if repository.NARROW_REQUIREMENT not in repo.requirements:
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135 return
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136 vfs = repo.vfs
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137 vfs.tryunlink(backupname)
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138 util.copyfile(vfs.join(FILENAME), vfs.join(backupname), hardlink=True)
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139
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140 def restorebackup(repo, backupname):
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141 if repository.NARROW_REQUIREMENT not in repo.requirements:
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142 return
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143 repo.vfs.rename(backupname, FILENAME, checkambig=True)
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144
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145 def clearbackup(repo, backupname):
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146 if repository.NARROW_REQUIREMENT not in repo.requirements:
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147 return
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148 repo.vfs.unlink(backupname)
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149
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150 def restrictpatterns(req_includes, req_excludes, repo_includes, repo_excludes):
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151 r""" Restricts the patterns according to repo settings,
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152 results in a logical AND operation
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153
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154 :param req_includes: requested includes
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155 :param req_excludes: requested excludes
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156 :param repo_includes: repo includes
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157 :param repo_excludes: repo excludes
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158 :return: include patterns, exclude patterns, and invalid include patterns.
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159
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160 >>> restrictpatterns({'f1','f2'}, {}, ['f1'], [])
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161 (set(['f1']), {}, [])
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162 >>> restrictpatterns({'f1'}, {}, ['f1','f2'], [])
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163 (set(['f1']), {}, [])
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164 >>> restrictpatterns({'f1/fc1', 'f3/fc3'}, {}, ['f1','f2'], [])
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165 (set(['f1/fc1']), {}, [])
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166 >>> restrictpatterns({'f1_fc1'}, {}, ['f1','f2'], [])
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167 ([], set(['path:.']), [])
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168 >>> restrictpatterns({'f1/../f2/fc2'}, {}, ['f1','f2'], [])
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169 (set(['f2/fc2']), {}, [])
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170 >>> restrictpatterns({'f1/../f3/fc3'}, {}, ['f1','f2'], [])
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171 ([], set(['path:.']), [])
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172 >>> restrictpatterns({'f1/$non_exitent_var'}, {}, ['f1','f2'], [])
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173 (set(['f1/$non_exitent_var']), {}, [])
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174 """
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175 res_excludes = set(req_excludes)
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176 res_excludes.update(repo_excludes)
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177 invalid_includes = []
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178 if not req_includes:
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179 res_includes = set(repo_includes)
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180 elif 'path:.' not in repo_includes:
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181 res_includes = []
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182 for req_include in req_includes:
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183 req_include = util.expandpath(util.normpath(req_include))
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184 if req_include in repo_includes:
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185 res_includes.append(req_include)
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186 continue
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187 valid = False
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188 for repo_include in repo_includes:
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189 if req_include.startswith(repo_include + '/'):
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190 valid = True
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191 res_includes.append(req_include)
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192 break
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193 if not valid:
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194 invalid_includes.append(req_include)
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195 if len(res_includes) == 0:
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196 res_excludes = {'path:.'}
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197 else:
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198 res_includes = set(res_includes)
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199 else:
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200 res_includes = set(req_includes)
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201 return res_includes, res_excludes, invalid_includes