Mercurial > hg
annotate hgext/remotefilelog/shallowutil.py @ 51535:03247e37ccf7
branchcache: move the processing of the new data in a dedicated method
In a future changeset, this will allow the V3 of the branch cache to use a fast
path when possible.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 06 Mar 2024 16:18:03 +0100 |
parents | 8b369bcbadf1 |
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1 # shallowutil.py -- remotefilelog utilities |
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2 # |
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3 # Copyright 2014 Facebook, 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 import collections |
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9 import os |
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10 import stat |
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11 import struct |
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12 import tempfile |
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13 |
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14 from mercurial.i18n import _ |
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15 from mercurial.pycompat import open |
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16 from mercurial.node import hex |
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17 from mercurial import ( |
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18 error, |
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19 pycompat, |
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20 revlog, |
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21 util, |
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22 ) |
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23 from mercurial.utils import ( |
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24 hashutil, |
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25 storageutil, |
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26 stringutil, |
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27 ) |
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28 from . import constants |
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29 |
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30 if not pycompat.iswindows: |
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31 import grp |
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32 |
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33 |
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34 def isenabled(repo): |
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35 """returns whether the repository is remotefilelog enabled or not""" |
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36 return constants.SHALLOWREPO_REQUIREMENT in repo.requirements |
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37 |
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38 |
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39 def getcachekey(reponame, file, id): |
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40 pathhash = hex(hashutil.sha1(file).digest()) |
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41 return os.path.join(reponame, pathhash[:2], pathhash[2:], id) |
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42 |
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43 |
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44 def getlocalkey(file, id): |
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45 pathhash = hex(hashutil.sha1(file).digest()) |
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46 return os.path.join(pathhash, id) |
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47 |
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48 |
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49 def getcachepath(ui, allowempty=False): |
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50 cachepath = ui.config(b"remotefilelog", b"cachepath") |
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51 if not cachepath: |
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52 if allowempty: |
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53 return None |
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54 else: |
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55 raise error.Abort( |
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56 _(b"could not find config option remotefilelog.cachepath") |
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57 ) |
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58 return util.expandpath(cachepath) |
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59 |
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60 |
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61 def getcachepackpath(repo, category): |
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62 cachepath = getcachepath(repo.ui) |
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63 if category != constants.FILEPACK_CATEGORY: |
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64 return os.path.join(cachepath, repo.name, b'packs', category) |
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65 else: |
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66 return os.path.join(cachepath, repo.name, b'packs') |
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67 |
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68 |
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69 def getlocalpackpath(base, category): |
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70 return os.path.join(base, b'packs', category) |
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71 |
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72 |
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73 def createrevlogtext(text, copyfrom=None, copyrev=None): |
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74 """returns a string that matches the revlog contents in a |
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75 traditional revlog |
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76 """ |
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77 meta = {} |
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78 if copyfrom or text.startswith(b'\1\n'): |
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79 if copyfrom: |
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80 meta[b'copy'] = copyfrom |
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81 meta[b'copyrev'] = copyrev |
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82 text = storageutil.packmeta(meta, text) |
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83 |
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84 return text |
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85 |
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86 |
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87 def parsemeta(text): |
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88 """parse mercurial filelog metadata""" |
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89 meta, size = storageutil.parsemeta(text) |
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90 if text.startswith(b'\1\n'): |
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91 s = text.index(b'\1\n', 2) |
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92 text = text[s + 2 :] |
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93 return meta or {}, text |
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94 |
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95 |
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96 def sumdicts(*dicts): |
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97 """Adds all the values of *dicts together into one dictionary. This assumes |
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98 the values in *dicts are all summable. |
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99 |
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100 e.g. [{'a': 4', 'b': 2}, {'b': 3, 'c': 1}] -> {'a': 4, 'b': 5, 'c': 1} |
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101 """ |
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102 result = collections.defaultdict(lambda: 0) |
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103 for dict in dicts: |
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104 for k, v in dict.items(): |
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105 result[k] += v |
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106 return result |
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107 |
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108 |
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109 def prefixkeys(dict, prefix): |
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110 """Returns ``dict`` with ``prefix`` prepended to all its keys.""" |
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111 result = {} |
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112 for k, v in dict.items(): |
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113 result[prefix + k] = v |
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114 return result |
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115 |
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116 |
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117 def reportpackmetrics(ui, prefix, *stores): |
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118 dicts = [s.getmetrics() for s in stores] |
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119 dict = prefixkeys(sumdicts(*dicts), prefix + b'_') |
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120 ui.log(prefix + b"_packsizes", b"\n", **pycompat.strkwargs(dict)) |
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121 |
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122 |
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123 def _parsepackmeta(metabuf): |
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124 """parse datapack meta, bytes (<metadata-list>) -> dict |
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125 |
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126 The dict contains raw content - both keys and values are strings. |
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127 Upper-level business may want to convert some of them to other types like |
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128 integers, on their own. |
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129 |
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130 raise ValueError if the data is corrupted |
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131 """ |
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132 metadict = {} |
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133 offset = 0 |
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134 buflen = len(metabuf) |
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135 while buflen - offset >= 3: |
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136 key = metabuf[offset : offset + 1] |
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137 offset += 1 |
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138 metalen = struct.unpack_from(b'!H', metabuf, offset)[0] |
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139 offset += 2 |
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140 if offset + metalen > buflen: |
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141 raise ValueError(b'corrupted metadata: incomplete buffer') |
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142 value = metabuf[offset : offset + metalen] |
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143 metadict[key] = value |
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144 offset += metalen |
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145 if offset != buflen: |
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146 raise ValueError(b'corrupted metadata: redundant data') |
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147 return metadict |
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148 |
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149 |
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150 def _buildpackmeta(metadict): |
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151 """reverse of _parsepackmeta, dict -> bytes (<metadata-list>) |
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152 |
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153 The dict contains raw content - both keys and values are strings. |
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154 Upper-level business may want to serialize some of other types (like |
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155 integers) to strings before calling this function. |
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156 |
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157 raise ProgrammingError when metadata key is illegal, or ValueError if |
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158 length limit is exceeded |
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159 """ |
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160 metabuf = b'' |
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161 for k, v in sorted((metadict or {}).items()): |
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162 if len(k) != 1: |
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163 raise error.ProgrammingError(b'packmeta: illegal key: %s' % k) |
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164 if len(v) > 0xFFFE: |
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165 raise ValueError( |
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166 b'metadata value is too long: 0x%x > 0xfffe' % len(v) |
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167 ) |
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168 metabuf += k |
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169 metabuf += struct.pack(b'!H', len(v)) |
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170 metabuf += v |
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171 # len(metabuf) is guaranteed representable in 4 bytes, because there are |
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172 # only 256 keys, and for each value, len(value) <= 0xfffe. |
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173 return metabuf |
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174 |
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175 |
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176 _metaitemtypes = { |
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177 constants.METAKEYFLAG: (int, int), |
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178 constants.METAKEYSIZE: (int, int), |
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179 } |
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180 |
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181 |
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182 def buildpackmeta(metadict): |
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183 """like _buildpackmeta, but typechecks metadict and normalize it. |
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184 |
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185 This means, METAKEYSIZE and METAKEYSIZE should have integers as values, |
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186 and METAKEYFLAG will be dropped if its value is 0. |
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187 """ |
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188 newmeta = {} |
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189 for k, v in (metadict or {}).items(): |
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190 expectedtype = _metaitemtypes.get(k, (bytes,)) |
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191 if not isinstance(v, expectedtype): |
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192 raise error.ProgrammingError(b'packmeta: wrong type of key %s' % k) |
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193 # normalize int to binary buffer |
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194 if int in expectedtype: |
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195 # optimization: remove flag if it's 0 to save space |
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196 if k == constants.METAKEYFLAG and v == 0: |
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197 continue |
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198 v = int2bin(v) |
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199 newmeta[k] = v |
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200 return _buildpackmeta(newmeta) |
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201 |
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202 |
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203 def parsepackmeta(metabuf): |
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204 """like _parsepackmeta, but convert fields to desired types automatically. |
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205 |
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206 This means, METAKEYFLAG and METAKEYSIZE fields will be converted to |
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207 integers. |
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208 """ |
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209 metadict = _parsepackmeta(metabuf) |
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210 for k, v in metadict.items(): |
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211 if k in _metaitemtypes and int in _metaitemtypes[k]: |
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212 metadict[k] = bin2int(v) |
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213 return metadict |
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214 |
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215 |
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216 def int2bin(n): |
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217 """convert a non-negative integer to raw binary buffer""" |
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218 buf = bytearray() |
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219 while n > 0: |
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220 buf.insert(0, n & 0xFF) |
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221 n >>= 8 |
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222 return bytes(buf) |
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223 |
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224 |
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225 def bin2int(buf): |
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226 """the reverse of int2bin, convert a binary buffer to an integer""" |
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227 x = 0 |
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228 for b in bytearray(buf): |
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229 x <<= 8 |
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230 x |= b |
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231 return x |
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232 |
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233 |
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234 class BadRemotefilelogHeader(error.StorageError): |
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235 """Exception raised when parsing a remotefilelog blob header fails.""" |
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236 |
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237 |
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238 def parsesizeflags(raw): |
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239 """given a remotefilelog blob, return (headersize, rawtextsize, flags) |
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240 |
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241 see remotefilelogserver.createfileblob for the format. |
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242 raise RuntimeError if the content is illformed. |
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243 """ |
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244 flags = revlog.REVIDX_DEFAULT_FLAGS |
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245 size = None |
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246 try: |
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247 index = raw.index(b'\0') |
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248 except ValueError: |
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249 raise BadRemotefilelogHeader( |
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250 b"unexpected remotefilelog header: illegal format" |
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251 ) |
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252 header = raw[:index] |
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253 if header.startswith(b'v'): |
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254 # v1 and above, header starts with 'v' |
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255 if header.startswith(b'v1\n'): |
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256 for s in header.split(b'\n'): |
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257 if s.startswith(constants.METAKEYSIZE): |
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258 size = int(s[len(constants.METAKEYSIZE) :]) |
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259 elif s.startswith(constants.METAKEYFLAG): |
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260 flags = int(s[len(constants.METAKEYFLAG) :]) |
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261 else: |
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262 raise BadRemotefilelogHeader( |
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263 b'unsupported remotefilelog header: %s' % header |
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264 ) |
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265 else: |
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266 # v0, str(int(size)) is the header |
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267 size = int(header) |
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268 if size is None: |
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269 raise BadRemotefilelogHeader( |
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270 b"unexpected remotefilelog header: no size found" |
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271 ) |
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272 return index + 1, size, flags |
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273 |
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274 |
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275 def buildfileblobheader(size, flags, version=None): |
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276 """return the header of a remotefilelog blob. |
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277 |
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278 see remotefilelogserver.createfileblob for the format. |
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279 approximately the reverse of parsesizeflags. |
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280 |
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281 version could be 0 or 1, or None (auto decide). |
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282 """ |
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283 # choose v0 if flags is empty, otherwise v1 |
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284 if version is None: |
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285 version = int(bool(flags)) |
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286 if version == 1: |
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287 header = b'v1\n%s%d\n%s%d' % ( |
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288 constants.METAKEYSIZE, |
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289 size, |
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290 constants.METAKEYFLAG, |
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291 flags, |
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292 ) |
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293 elif version == 0: |
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294 if flags: |
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295 raise error.ProgrammingError(b'fileblob v0 does not support flag') |
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296 header = b'%d' % size |
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297 else: |
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298 raise error.ProgrammingError(b'unknown fileblob version %d' % version) |
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299 return header |
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300 |
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301 |
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302 def ancestormap(raw): |
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303 offset, size, flags = parsesizeflags(raw) |
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304 start = offset + size |
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305 |
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306 mapping = {} |
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307 while start < len(raw): |
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308 divider = raw.index(b'\0', start + 80) |
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309 |
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310 currentnode = raw[start : (start + 20)] |
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311 p1 = raw[(start + 20) : (start + 40)] |
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312 p2 = raw[(start + 40) : (start + 60)] |
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313 linknode = raw[(start + 60) : (start + 80)] |
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314 copyfrom = raw[(start + 80) : divider] |
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315 |
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316 mapping[currentnode] = (p1, p2, linknode, copyfrom) |
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317 start = divider + 1 |
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318 |
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319 return mapping |
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320 |
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321 |
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322 def readfile(path): |
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323 f = open(path, b'rb') |
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324 try: |
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325 result = f.read() |
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326 |
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327 # we should never have empty files |
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328 if not result: |
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329 os.remove(path) |
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330 raise IOError(b"empty file: %s" % path) |
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331 |
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332 return result |
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333 finally: |
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334 f.close() |
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335 |
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336 |
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337 def unlinkfile(filepath): |
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338 if pycompat.iswindows: |
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339 # On Windows, os.unlink cannnot delete readonly files |
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340 os.chmod(filepath, stat.S_IWUSR) |
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341 os.unlink(filepath) |
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342 |
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343 |
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344 def renamefile(source, destination): |
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345 if pycompat.iswindows: |
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346 # On Windows, os.rename cannot rename readonly files |
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347 # and cannot overwrite destination if it exists |
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348 os.chmod(source, stat.S_IWUSR) |
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349 if os.path.isfile(destination): |
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350 os.chmod(destination, stat.S_IWUSR) |
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351 os.unlink(destination) |
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352 |
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353 os.rename(source, destination) |
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354 |
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355 |
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356 def writefile(path, content, readonly=False): |
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357 dirname, filename = os.path.split(path) |
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358 if not os.path.exists(dirname): |
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359 try: |
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360 os.makedirs(dirname) |
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361 except FileExistsError: |
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362 pass |
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363 |
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364 fd, temp = tempfile.mkstemp(prefix=b'.%s-' % filename, dir=dirname) |
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365 os.close(fd) |
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366 |
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367 try: |
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368 f = util.posixfile(temp, b'wb') |
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369 f.write(content) |
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370 f.close() |
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371 |
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372 if readonly: |
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373 mode = 0o444 |
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374 else: |
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375 # tempfiles are created with 0o600, so we need to manually set the |
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376 # mode. |
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377 oldumask = os.umask(0) |
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378 # there's no way to get the umask without modifying it, so set it |
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379 # back |
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380 os.umask(oldumask) |
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381 mode = ~oldumask |
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382 |
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383 renamefile(temp, path) |
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384 os.chmod(path, mode) |
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385 except Exception: |
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386 try: |
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387 unlinkfile(temp) |
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388 except OSError: |
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389 pass |
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390 raise |
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391 |
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392 |
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393 def sortnodes(nodes, parentfunc): |
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394 """Topologically sorts the nodes, using the parentfunc to find |
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395 the parents of nodes.""" |
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396 nodes = set(nodes) |
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397 childmap = {} |
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398 parentmap = {} |
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399 roots = [] |
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400 |
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401 # Build a child and parent map |
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402 for n in nodes: |
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403 parents = [p for p in parentfunc(n) if p in nodes] |
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404 parentmap[n] = set(parents) |
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405 for p in parents: |
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406 childmap.setdefault(p, set()).add(n) |
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407 if not parents: |
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408 roots.append(n) |
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409 |
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410 roots.sort() |
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411 # Process roots, adding children to the queue as they become roots |
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412 results = [] |
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413 while roots: |
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414 n = roots.pop(0) |
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415 results.append(n) |
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416 if n in childmap: |
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417 children = childmap[n] |
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418 for c in children: |
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419 childparents = parentmap[c] |
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420 childparents.remove(n) |
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421 if len(childparents) == 0: |
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422 # insert at the beginning, that way child nodes |
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423 # are likely to be output immediately after their |
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424 # parents. This gives better compression results. |
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425 roots.insert(0, c) |
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426 |
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427 return results |
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428 |
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429 |
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430 def readexactly(stream, n): |
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431 '''read n bytes from stream.read and abort if less was available''' |
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432 s = stream.read(n) |
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433 if len(s) < n: |
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434 raise error.Abort( |
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435 _(b"stream ended unexpectedly (got %d bytes, expected %d)") |
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436 % (len(s), n) |
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437 ) |
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438 return s |
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439 |
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440 |
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441 def readunpack(stream, fmt): |
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442 data = readexactly(stream, struct.calcsize(fmt)) |
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443 return struct.unpack(fmt, data) |
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444 |
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445 |
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446 def readpath(stream): |
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447 rawlen = readexactly(stream, constants.FILENAMESIZE) |
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448 pathlen = struct.unpack(constants.FILENAMESTRUCT, rawlen)[0] |
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449 return readexactly(stream, pathlen) |
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450 |
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451 |
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452 def readnodelist(stream): |
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453 rawlen = readexactly(stream, constants.NODECOUNTSIZE) |
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454 nodecount = struct.unpack(constants.NODECOUNTSTRUCT, rawlen)[0] |
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455 for i in range(nodecount): |
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456 yield readexactly(stream, constants.NODESIZE) |
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457 |
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458 |
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459 def readpathlist(stream): |
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460 rawlen = readexactly(stream, constants.PATHCOUNTSIZE) |
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461 pathcount = struct.unpack(constants.PATHCOUNTSTRUCT, rawlen)[0] |
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462 for i in range(pathcount): |
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463 yield readpath(stream) |
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464 |
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465 |
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466 def getgid(groupname): |
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467 try: |
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468 gid = grp.getgrnam(pycompat.fsdecode(groupname)).gr_gid |
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469 return gid |
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470 except KeyError: |
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471 return None |
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472 |
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473 |
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474 def setstickygroupdir(path, gid, warn=None): |
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475 if gid is None: |
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476 return |
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477 try: |
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478 os.chown(path, -1, gid) |
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479 os.chmod(path, 0o2775) |
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480 except (IOError, OSError) as ex: |
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481 if warn: |
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482 warn(_(b'unable to chown/chmod on %s: %s\n') % (path, ex)) |
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483 |
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484 |
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485 def mkstickygroupdir(ui, path): |
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486 """Creates the given directory (if it doesn't exist) and give it a |
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487 particular group with setgid enabled.""" |
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488 gid = None |
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489 groupname = ui.config(b"remotefilelog", b"cachegroup") |
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490 if groupname: |
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|
491 gid = getgid(groupname) |
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492 if gid is None: |
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493 ui.warn(_(b'unable to resolve group name: %s\n') % groupname) |
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|
494 |
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|
495 # we use a single stat syscall to test the existence and mode / group bit |
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|
496 st = None |
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|
497 try: |
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498 st = os.stat(path) |
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499 except OSError: |
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|
500 pass |
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|
501 |
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|
502 if st: |
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503 # exists |
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504 if (st.st_mode & 0o2775) != 0o2775 or st.st_gid != gid: |
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505 # permission needs to be fixed |
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|
506 setstickygroupdir(path, gid, ui.warn) |
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|
507 return |
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changeset
|
508 |
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|
509 oldumask = os.umask(0o002) |
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changeset
|
510 try: |
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|
511 missingdirs = [path] |
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512 path = os.path.dirname(path) |
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|
513 while path and not os.path.exists(path): |
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514 missingdirs.append(path) |
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515 path = os.path.dirname(path) |
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|
516 |
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|
517 for path in reversed(missingdirs): |
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Augie Fackler <augie@google.com>
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|
518 try: |
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changeset
|
519 os.mkdir(path) |
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520 except FileExistsError: |
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521 pass |
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|
522 |
3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
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changeset
|
523 for path in missingdirs: |
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|
524 setstickygroupdir(path, gid, ui.warn) |
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|
525 finally: |
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changeset
|
526 os.umask(oldumask) |
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changeset
|
527 |
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|
528 |
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Augie Fackler <augie@google.com>
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|
529 def getusername(ui): |
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|
530 try: |
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|
531 return stringutil.shortuser(ui.username()) |
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|
532 except Exception: |
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|
533 return b'unknown' |
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changeset
|
534 |
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|
535 |
40495
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|
536 def getreponame(ui): |
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|
537 reponame = ui.config(b'paths', b'default') |
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changeset
|
538 if reponame: |
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Augie Fackler <augie@google.com>
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diff
changeset
|
539 return os.path.basename(reponame) |
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|
540 return b"unknown" |