Mercurial > hg
annotate hgext/remotefilelog/shallowutil.py @ 46113:59fa3890d40a
node: import symbols explicitly
There is no point in lazy importing mercurial.node, it is used all over
the place anyway. So consistently import the used symbols directly.
Fix one file using symbols indirectly via mercurial.revlog.
Differential Revision: https://phab.mercurial-scm.org/D9480
author | Joerg Sonnenberger <joerg@bec.de> |
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date | Tue, 01 Dec 2020 21:54:46 +0100 |
parents | 2d49482d0dd4 |
children | e972077600e5 |
rev | line source |
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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 from __future__ import absolute_import |
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8 |
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9 import collections |
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10 import errno |
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11 import os |
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12 import stat |
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13 import struct |
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14 import tempfile |
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15 |
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16 from mercurial.i18n import _ |
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17 from mercurial.pycompat import open |
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18 from mercurial.node import hex |
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19 from mercurial import ( |
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20 error, |
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21 pycompat, |
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22 revlog, |
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23 util, |
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24 ) |
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25 from mercurial.utils import ( |
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26 hashutil, |
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27 storageutil, |
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28 stringutil, |
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29 ) |
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30 from . import constants |
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31 |
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32 if not pycompat.iswindows: |
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33 import grp |
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34 |
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35 |
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36 def isenabled(repo): |
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37 """returns whether the repository is remotefilelog enabled or not""" |
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38 return constants.SHALLOWREPO_REQUIREMENT in repo.requirements |
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39 |
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40 |
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41 def getcachekey(reponame, file, id): |
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42 pathhash = hex(hashutil.sha1(file).digest()) |
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43 return os.path.join(reponame, pathhash[:2], pathhash[2:], id) |
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44 |
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45 |
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46 def getlocalkey(file, id): |
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47 pathhash = hex(hashutil.sha1(file).digest()) |
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48 return os.path.join(pathhash, id) |
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49 |
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50 |
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51 def getcachepath(ui, allowempty=False): |
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52 cachepath = ui.config(b"remotefilelog", b"cachepath") |
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53 if not cachepath: |
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54 if allowempty: |
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55 return None |
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56 else: |
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57 raise error.Abort( |
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58 _(b"could not find config option remotefilelog.cachepath") |
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59 ) |
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60 return util.expandpath(cachepath) |
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61 |
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62 |
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63 def getcachepackpath(repo, category): |
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64 cachepath = getcachepath(repo.ui) |
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65 if category != constants.FILEPACK_CATEGORY: |
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66 return os.path.join(cachepath, repo.name, b'packs', category) |
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67 else: |
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68 return os.path.join(cachepath, repo.name, b'packs') |
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69 |
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70 |
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71 def getlocalpackpath(base, category): |
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72 return os.path.join(base, b'packs', category) |
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73 |
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74 |
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75 def createrevlogtext(text, copyfrom=None, copyrev=None): |
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76 """returns a string that matches the revlog contents in a |
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77 traditional revlog |
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78 """ |
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79 meta = {} |
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80 if copyfrom or text.startswith(b'\1\n'): |
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81 if copyfrom: |
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82 meta[b'copy'] = copyfrom |
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83 meta[b'copyrev'] = copyrev |
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84 text = storageutil.packmeta(meta, text) |
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85 |
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86 return text |
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87 |
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88 |
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89 def parsemeta(text): |
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90 """parse mercurial filelog metadata""" |
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91 meta, size = storageutil.parsemeta(text) |
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92 if text.startswith(b'\1\n'): |
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93 s = text.index(b'\1\n', 2) |
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94 text = text[s + 2 :] |
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95 return meta or {}, text |
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96 |
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97 |
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98 def sumdicts(*dicts): |
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99 """Adds all the values of *dicts together into one dictionary. This assumes |
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100 the values in *dicts are all summable. |
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101 |
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102 e.g. [{'a': 4', 'b': 2}, {'b': 3, 'c': 1}] -> {'a': 4, 'b': 5, 'c': 1} |
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103 """ |
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104 result = collections.defaultdict(lambda: 0) |
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105 for dict in dicts: |
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106 for k, v in pycompat.iteritems(dict): |
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107 result[k] += v |
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108 return result |
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109 |
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110 |
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111 def prefixkeys(dict, prefix): |
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112 """Returns ``dict`` with ``prefix`` prepended to all its keys.""" |
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113 result = {} |
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114 for k, v in pycompat.iteritems(dict): |
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115 result[prefix + k] = v |
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116 return result |
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117 |
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118 |
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119 def reportpackmetrics(ui, prefix, *stores): |
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120 dicts = [s.getmetrics() for s in stores] |
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121 dict = prefixkeys(sumdicts(*dicts), prefix + b'_') |
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122 ui.log(prefix + b"_packsizes", b"\n", **pycompat.strkwargs(dict)) |
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123 |
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124 |
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125 def _parsepackmeta(metabuf): |
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126 """parse datapack meta, bytes (<metadata-list>) -> dict |
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127 |
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128 The dict contains raw content - both keys and values are strings. |
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129 Upper-level business may want to convert some of them to other types like |
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130 integers, on their own. |
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131 |
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132 raise ValueError if the data is corrupted |
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133 """ |
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134 metadict = {} |
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135 offset = 0 |
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136 buflen = len(metabuf) |
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137 while buflen - offset >= 3: |
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138 key = metabuf[offset : offset + 1] |
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139 offset += 1 |
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140 metalen = struct.unpack_from(b'!H', metabuf, offset)[0] |
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141 offset += 2 |
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142 if offset + metalen > buflen: |
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143 raise ValueError(b'corrupted metadata: incomplete buffer') |
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144 value = metabuf[offset : offset + metalen] |
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145 metadict[key] = value |
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146 offset += metalen |
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147 if offset != buflen: |
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148 raise ValueError(b'corrupted metadata: redundant data') |
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149 return metadict |
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150 |
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151 |
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152 def _buildpackmeta(metadict): |
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153 """reverse of _parsepackmeta, dict -> bytes (<metadata-list>) |
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154 |
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155 The dict contains raw content - both keys and values are strings. |
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156 Upper-level business may want to serialize some of other types (like |
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157 integers) to strings before calling this function. |
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158 |
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159 raise ProgrammingError when metadata key is illegal, or ValueError if |
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160 length limit is exceeded |
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161 """ |
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162 metabuf = b'' |
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163 for k, v in sorted(pycompat.iteritems((metadict or {}))): |
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164 if len(k) != 1: |
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165 raise error.ProgrammingError(b'packmeta: illegal key: %s' % k) |
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166 if len(v) > 0xFFFE: |
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167 raise ValueError( |
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168 b'metadata value is too long: 0x%x > 0xfffe' % len(v) |
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169 ) |
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170 metabuf += k |
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171 metabuf += struct.pack(b'!H', len(v)) |
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172 metabuf += v |
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173 # len(metabuf) is guaranteed representable in 4 bytes, because there are |
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174 # only 256 keys, and for each value, len(value) <= 0xfffe. |
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175 return metabuf |
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176 |
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177 |
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178 _metaitemtypes = { |
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179 constants.METAKEYFLAG: (int, pycompat.long), |
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180 constants.METAKEYSIZE: (int, pycompat.long), |
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181 } |
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182 |
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183 |
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184 def buildpackmeta(metadict): |
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185 """like _buildpackmeta, but typechecks metadict and normalize it. |
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186 |
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187 This means, METAKEYSIZE and METAKEYSIZE should have integers as values, |
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188 and METAKEYFLAG will be dropped if its value is 0. |
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189 """ |
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190 newmeta = {} |
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191 for k, v in pycompat.iteritems(metadict or {}): |
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192 expectedtype = _metaitemtypes.get(k, (bytes,)) |
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193 if not isinstance(v, expectedtype): |
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194 raise error.ProgrammingError(b'packmeta: wrong type of key %s' % k) |
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195 # normalize int to binary buffer |
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196 if int in expectedtype: |
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197 # optimization: remove flag if it's 0 to save space |
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198 if k == constants.METAKEYFLAG and v == 0: |
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199 continue |
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200 v = int2bin(v) |
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201 newmeta[k] = v |
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202 return _buildpackmeta(newmeta) |
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203 |
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204 |
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205 def parsepackmeta(metabuf): |
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206 """like _parsepackmeta, but convert fields to desired types automatically. |
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207 |
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208 This means, METAKEYFLAG and METAKEYSIZE fields will be converted to |
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209 integers. |
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210 """ |
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211 metadict = _parsepackmeta(metabuf) |
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212 for k, v in pycompat.iteritems(metadict): |
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213 if k in _metaitemtypes and int in _metaitemtypes[k]: |
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214 metadict[k] = bin2int(v) |
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215 return metadict |
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216 |
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217 |
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218 def int2bin(n): |
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219 """convert a non-negative integer to raw binary buffer""" |
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220 buf = bytearray() |
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221 while n > 0: |
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222 buf.insert(0, n & 0xFF) |
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223 n >>= 8 |
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224 return bytes(buf) |
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225 |
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226 |
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227 def bin2int(buf): |
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228 """the reverse of int2bin, convert a binary buffer to an integer""" |
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229 x = 0 |
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230 for b in bytearray(buf): |
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231 x <<= 8 |
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232 x |= b |
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233 return x |
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234 |
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235 |
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236 def parsesizeflags(raw): |
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237 """given a remotefilelog blob, return (headersize, rawtextsize, flags) |
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238 |
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239 see remotefilelogserver.createfileblob for the format. |
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240 raise RuntimeError if the content is illformed. |
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241 """ |
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242 flags = revlog.REVIDX_DEFAULT_FLAGS |
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243 size = None |
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244 try: |
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245 index = raw.index(b'\0') |
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246 header = raw[:index] |
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247 if header.startswith(b'v'): |
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248 # v1 and above, header starts with 'v' |
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249 if header.startswith(b'v1\n'): |
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250 for s in header.split(b'\n'): |
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251 if s.startswith(constants.METAKEYSIZE): |
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252 size = int(s[len(constants.METAKEYSIZE) :]) |
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253 elif s.startswith(constants.METAKEYFLAG): |
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254 flags = int(s[len(constants.METAKEYFLAG) :]) |
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255 else: |
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256 raise RuntimeError( |
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257 b'unsupported remotefilelog header: %s' % header |
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258 ) |
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259 else: |
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260 # v0, str(int(size)) is the header |
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261 size = int(header) |
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262 except ValueError: |
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263 raise RuntimeError("unexpected remotefilelog header: illegal format") |
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264 if size is None: |
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265 raise RuntimeError("unexpected remotefilelog header: no size found") |
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266 return index + 1, size, flags |
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267 |
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268 |
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269 def buildfileblobheader(size, flags, version=None): |
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270 """return the header of a remotefilelog blob. |
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271 |
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272 see remotefilelogserver.createfileblob for the format. |
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273 approximately the reverse of parsesizeflags. |
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274 |
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275 version could be 0 or 1, or None (auto decide). |
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276 """ |
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277 # choose v0 if flags is empty, otherwise v1 |
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278 if version is None: |
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279 version = int(bool(flags)) |
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280 if version == 1: |
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281 header = b'v1\n%s%d\n%s%d' % ( |
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282 constants.METAKEYSIZE, |
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283 size, |
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284 constants.METAKEYFLAG, |
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285 flags, |
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286 ) |
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287 elif version == 0: |
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288 if flags: |
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289 raise error.ProgrammingError(b'fileblob v0 does not support flag') |
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290 header = b'%d' % size |
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291 else: |
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292 raise error.ProgrammingError(b'unknown fileblob version %d' % version) |
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293 return header |
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294 |
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295 |
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296 def ancestormap(raw): |
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297 offset, size, flags = parsesizeflags(raw) |
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298 start = offset + size |
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299 |
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300 mapping = {} |
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301 while start < len(raw): |
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302 divider = raw.index(b'\0', start + 80) |
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303 |
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304 currentnode = raw[start : (start + 20)] |
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305 p1 = raw[(start + 20) : (start + 40)] |
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306 p2 = raw[(start + 40) : (start + 60)] |
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307 linknode = raw[(start + 60) : (start + 80)] |
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308 copyfrom = raw[(start + 80) : divider] |
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309 |
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310 mapping[currentnode] = (p1, p2, linknode, copyfrom) |
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311 start = divider + 1 |
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312 |
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313 return mapping |
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314 |
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315 |
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316 def readfile(path): |
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317 f = open(path, b'rb') |
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318 try: |
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319 result = f.read() |
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320 |
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321 # we should never have empty files |
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322 if not result: |
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323 os.remove(path) |
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324 raise IOError(b"empty file: %s" % path) |
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325 |
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326 return result |
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327 finally: |
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328 f.close() |
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329 |
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330 |
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331 def unlinkfile(filepath): |
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332 if pycompat.iswindows: |
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333 # On Windows, os.unlink cannnot delete readonly files |
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334 os.chmod(filepath, stat.S_IWUSR) |
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335 os.unlink(filepath) |
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336 |
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337 |
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338 def renamefile(source, destination): |
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339 if pycompat.iswindows: |
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340 # On Windows, os.rename cannot rename readonly files |
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341 # and cannot overwrite destination if it exists |
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342 os.chmod(source, stat.S_IWUSR) |
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343 if os.path.isfile(destination): |
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344 os.chmod(destination, stat.S_IWUSR) |
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345 os.unlink(destination) |
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346 |
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347 os.rename(source, destination) |
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348 |
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349 |
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350 def writefile(path, content, readonly=False): |
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351 dirname, filename = os.path.split(path) |
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352 if not os.path.exists(dirname): |
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353 try: |
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354 os.makedirs(dirname) |
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355 except OSError as ex: |
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356 if ex.errno != errno.EEXIST: |
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357 raise |
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358 |
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359 fd, temp = tempfile.mkstemp(prefix=b'.%s-' % filename, dir=dirname) |
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360 os.close(fd) |
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361 |
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362 try: |
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363 f = util.posixfile(temp, b'wb') |
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364 f.write(content) |
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365 f.close() |
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366 |
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367 if readonly: |
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368 mode = 0o444 |
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369 else: |
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370 # tempfiles are created with 0o600, so we need to manually set the |
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371 # mode. |
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372 oldumask = os.umask(0) |
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373 # there's no way to get the umask without modifying it, so set it |
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374 # back |
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375 os.umask(oldumask) |
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376 mode = ~oldumask |
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377 |
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378 renamefile(temp, path) |
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379 os.chmod(path, mode) |
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380 except Exception: |
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381 try: |
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382 unlinkfile(temp) |
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383 except OSError: |
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384 pass |
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385 raise |
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386 |
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387 |
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388 def sortnodes(nodes, parentfunc): |
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389 """Topologically sorts the nodes, using the parentfunc to find |
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390 the parents of nodes.""" |
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391 nodes = set(nodes) |
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392 childmap = {} |
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393 parentmap = {} |
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394 roots = [] |
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395 |
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396 # Build a child and parent map |
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397 for n in nodes: |
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398 parents = [p for p in parentfunc(n) if p in nodes] |
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399 parentmap[n] = set(parents) |
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400 for p in parents: |
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401 childmap.setdefault(p, set()).add(n) |
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402 if not parents: |
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403 roots.append(n) |
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404 |
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405 roots.sort() |
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406 # Process roots, adding children to the queue as they become roots |
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407 results = [] |
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408 while roots: |
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409 n = roots.pop(0) |
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410 results.append(n) |
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411 if n in childmap: |
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412 children = childmap[n] |
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413 for c in children: |
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414 childparents = parentmap[c] |
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415 childparents.remove(n) |
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416 if len(childparents) == 0: |
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417 # insert at the beginning, that way child nodes |
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418 # are likely to be output immediately after their |
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419 # parents. This gives better compression results. |
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420 roots.insert(0, c) |
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421 |
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422 return results |
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423 |
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424 |
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425 def readexactly(stream, n): |
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426 '''read n bytes from stream.read and abort if less was available''' |
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427 s = stream.read(n) |
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428 if len(s) < n: |
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429 raise error.Abort( |
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430 _(b"stream ended unexpectedly (got %d bytes, expected %d)") |
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431 % (len(s), n) |
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432 ) |
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433 return s |
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434 |
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435 |
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436 def readunpack(stream, fmt): |
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437 data = readexactly(stream, struct.calcsize(fmt)) |
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438 return struct.unpack(fmt, data) |
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439 |
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440 |
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441 def readpath(stream): |
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442 rawlen = readexactly(stream, constants.FILENAMESIZE) |
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443 pathlen = struct.unpack(constants.FILENAMESTRUCT, rawlen)[0] |
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444 return readexactly(stream, pathlen) |
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445 |
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446 |
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447 def readnodelist(stream): |
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448 rawlen = readexactly(stream, constants.NODECOUNTSIZE) |
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449 nodecount = struct.unpack(constants.NODECOUNTSTRUCT, rawlen)[0] |
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450 for i in pycompat.xrange(nodecount): |
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451 yield readexactly(stream, constants.NODESIZE) |
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452 |
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453 |
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454 def readpathlist(stream): |
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455 rawlen = readexactly(stream, constants.PATHCOUNTSIZE) |
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456 pathcount = struct.unpack(constants.PATHCOUNTSTRUCT, rawlen)[0] |
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457 for i in pycompat.xrange(pathcount): |
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458 yield readpath(stream) |
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459 |
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460 |
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461 def getgid(groupname): |
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462 try: |
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463 gid = grp.getgrnam(pycompat.fsdecode(groupname)).gr_gid |
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464 return gid |
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465 except KeyError: |
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466 return None |
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467 |
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468 |
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469 def setstickygroupdir(path, gid, warn=None): |
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470 if gid is None: |
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471 return |
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472 try: |
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473 os.chown(path, -1, gid) |
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474 os.chmod(path, 0o2775) |
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475 except (IOError, OSError) as ex: |
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476 if warn: |
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477 warn(_(b'unable to chown/chmod on %s: %s\n') % (path, ex)) |
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478 |
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479 |
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480 def mkstickygroupdir(ui, path): |
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481 """Creates the given directory (if it doesn't exist) and give it a |
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482 particular group with setgid enabled.""" |
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483 gid = None |
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484 groupname = ui.config(b"remotefilelog", b"cachegroup") |
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485 if groupname: |
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486 gid = getgid(groupname) |
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487 if gid is None: |
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488 ui.warn(_(b'unable to resolve group name: %s\n') % groupname) |
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489 |
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490 # we use a single stat syscall to test the existence and mode / group bit |
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491 st = None |
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492 try: |
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493 st = os.stat(path) |
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494 except OSError: |
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495 pass |
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496 |
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497 if st: |
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498 # exists |
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499 if (st.st_mode & 0o2775) != 0o2775 or st.st_gid != gid: |
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500 # permission needs to be fixed |
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501 setstickygroupdir(path, gid, ui.warn) |
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502 return |
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503 |
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504 oldumask = os.umask(0o002) |
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505 try: |
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506 missingdirs = [path] |
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507 path = os.path.dirname(path) |
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508 while path and not os.path.exists(path): |
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509 missingdirs.append(path) |
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510 path = os.path.dirname(path) |
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511 |
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512 for path in reversed(missingdirs): |
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513 try: |
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514 os.mkdir(path) |
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515 except OSError as ex: |
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516 if ex.errno != errno.EEXIST: |
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517 raise |
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518 |
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519 for path in missingdirs: |
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520 setstickygroupdir(path, gid, ui.warn) |
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521 finally: |
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522 os.umask(oldumask) |
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523 |
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524 |
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525 def getusername(ui): |
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526 try: |
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527 return stringutil.shortuser(ui.username()) |
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528 except Exception: |
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529 return b'unknown' |
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530 |
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531 |
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532 def getreponame(ui): |
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533 reponame = ui.config(b'paths', b'default') |
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534 if reponame: |
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535 return os.path.basename(reponame) |
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536 return b"unknown" |