Mercurial > hg
annotate hgext/remotefilelog/shallowutil.py @ 48932:176f1a0d15dc
py3: use int instead of pycompat.long
pycompat.long is aliased to int. So this should have no change in
functionality.
Differential Revision: https://phab.mercurial-scm.org/D12338
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Tue, 01 Mar 2022 20:50:34 -0800 |
parents | 0fe003495f72 |
children | d44e3c45f0e4 |
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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 errno |
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10 import os |
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11 import stat |
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12 import struct |
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13 import tempfile |
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14 |
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15 from mercurial.i18n import _ |
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16 from mercurial.pycompat import open |
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17 from mercurial.node import hex |
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18 from mercurial import ( |
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19 error, |
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20 pycompat, |
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21 revlog, |
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22 util, |
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23 ) |
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24 from mercurial.utils import ( |
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25 hashutil, |
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26 storageutil, |
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27 stringutil, |
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28 ) |
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29 from . import constants |
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30 |
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31 if not pycompat.iswindows: |
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32 import grp |
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33 |
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34 |
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35 def isenabled(repo): |
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36 """returns whether the repository is remotefilelog enabled or not""" |
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37 return constants.SHALLOWREPO_REQUIREMENT in repo.requirements |
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38 |
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39 |
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40 def getcachekey(reponame, file, id): |
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41 pathhash = hex(hashutil.sha1(file).digest()) |
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42 return os.path.join(reponame, pathhash[:2], pathhash[2:], id) |
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43 |
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44 |
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45 def getlocalkey(file, id): |
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46 pathhash = hex(hashutil.sha1(file).digest()) |
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47 return os.path.join(pathhash, id) |
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48 |
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49 |
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50 def getcachepath(ui, allowempty=False): |
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51 cachepath = ui.config(b"remotefilelog", b"cachepath") |
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52 if not cachepath: |
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53 if allowempty: |
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54 return None |
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55 else: |
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56 raise error.Abort( |
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57 _(b"could not find config option remotefilelog.cachepath") |
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58 ) |
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59 return util.expandpath(cachepath) |
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60 |
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61 |
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62 def getcachepackpath(repo, category): |
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63 cachepath = getcachepath(repo.ui) |
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64 if category != constants.FILEPACK_CATEGORY: |
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65 return os.path.join(cachepath, repo.name, b'packs', category) |
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66 else: |
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67 return os.path.join(cachepath, repo.name, b'packs') |
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68 |
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69 |
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70 def getlocalpackpath(base, category): |
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71 return os.path.join(base, b'packs', category) |
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72 |
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73 |
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74 def createrevlogtext(text, copyfrom=None, copyrev=None): |
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75 """returns a string that matches the revlog contents in a |
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76 traditional revlog |
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77 """ |
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78 meta = {} |
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79 if copyfrom or text.startswith(b'\1\n'): |
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80 if copyfrom: |
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81 meta[b'copy'] = copyfrom |
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82 meta[b'copyrev'] = copyrev |
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83 text = storageutil.packmeta(meta, text) |
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84 |
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85 return text |
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86 |
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87 |
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88 def parsemeta(text): |
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89 """parse mercurial filelog metadata""" |
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90 meta, size = storageutil.parsemeta(text) |
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91 if text.startswith(b'\1\n'): |
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92 s = text.index(b'\1\n', 2) |
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93 text = text[s + 2 :] |
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94 return meta or {}, text |
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95 |
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96 |
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97 def sumdicts(*dicts): |
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98 """Adds all the values of *dicts together into one dictionary. This assumes |
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99 the values in *dicts are all summable. |
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100 |
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101 e.g. [{'a': 4', 'b': 2}, {'b': 3, 'c': 1}] -> {'a': 4, 'b': 5, 'c': 1} |
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102 """ |
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103 result = collections.defaultdict(lambda: 0) |
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104 for dict in dicts: |
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105 for k, v in dict.items(): |
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106 result[k] += v |
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107 return result |
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108 |
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109 |
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110 def prefixkeys(dict, prefix): |
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111 """Returns ``dict`` with ``prefix`` prepended to all its keys.""" |
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112 result = {} |
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113 for k, v in dict.items(): |
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114 result[prefix + k] = v |
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115 return result |
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116 |
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117 |
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118 def reportpackmetrics(ui, prefix, *stores): |
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119 dicts = [s.getmetrics() for s in stores] |
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120 dict = prefixkeys(sumdicts(*dicts), prefix + b'_') |
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121 ui.log(prefix + b"_packsizes", b"\n", **pycompat.strkwargs(dict)) |
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122 |
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123 |
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124 def _parsepackmeta(metabuf): |
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125 """parse datapack meta, bytes (<metadata-list>) -> dict |
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126 |
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127 The dict contains raw content - both keys and values are strings. |
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128 Upper-level business may want to convert some of them to other types like |
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129 integers, on their own. |
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130 |
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131 raise ValueError if the data is corrupted |
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132 """ |
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133 metadict = {} |
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134 offset = 0 |
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135 buflen = len(metabuf) |
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136 while buflen - offset >= 3: |
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137 key = metabuf[offset : offset + 1] |
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138 offset += 1 |
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139 metalen = struct.unpack_from(b'!H', metabuf, offset)[0] |
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140 offset += 2 |
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141 if offset + metalen > buflen: |
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142 raise ValueError(b'corrupted metadata: incomplete buffer') |
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143 value = metabuf[offset : offset + metalen] |
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144 metadict[key] = value |
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145 offset += metalen |
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146 if offset != buflen: |
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147 raise ValueError(b'corrupted metadata: redundant data') |
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148 return metadict |
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149 |
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150 |
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151 def _buildpackmeta(metadict): |
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152 """reverse of _parsepackmeta, dict -> bytes (<metadata-list>) |
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153 |
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154 The dict contains raw content - both keys and values are strings. |
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155 Upper-level business may want to serialize some of other types (like |
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156 integers) to strings before calling this function. |
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157 |
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158 raise ProgrammingError when metadata key is illegal, or ValueError if |
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159 length limit is exceeded |
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160 """ |
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161 metabuf = b'' |
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162 for k, v in sorted((metadict or {}).items()): |
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163 if len(k) != 1: |
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164 raise error.ProgrammingError(b'packmeta: illegal key: %s' % k) |
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165 if len(v) > 0xFFFE: |
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166 raise ValueError( |
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167 b'metadata value is too long: 0x%x > 0xfffe' % len(v) |
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168 ) |
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169 metabuf += k |
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170 metabuf += struct.pack(b'!H', len(v)) |
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171 metabuf += v |
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172 # len(metabuf) is guaranteed representable in 4 bytes, because there are |
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173 # only 256 keys, and for each value, len(value) <= 0xfffe. |
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174 return metabuf |
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175 |
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176 |
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177 _metaitemtypes = { |
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178 constants.METAKEYFLAG: (int, int), |
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179 constants.METAKEYSIZE: (int, int), |
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180 } |
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181 |
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182 |
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183 def buildpackmeta(metadict): |
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184 """like _buildpackmeta, but typechecks metadict and normalize it. |
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185 |
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186 This means, METAKEYSIZE and METAKEYSIZE should have integers as values, |
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187 and METAKEYFLAG will be dropped if its value is 0. |
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188 """ |
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189 newmeta = {} |
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190 for k, v in (metadict or {}).items(): |
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191 expectedtype = _metaitemtypes.get(k, (bytes,)) |
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192 if not isinstance(v, expectedtype): |
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193 raise error.ProgrammingError(b'packmeta: wrong type of key %s' % k) |
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194 # normalize int to binary buffer |
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195 if int in expectedtype: |
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196 # optimization: remove flag if it's 0 to save space |
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197 if k == constants.METAKEYFLAG and v == 0: |
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198 continue |
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199 v = int2bin(v) |
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200 newmeta[k] = v |
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201 return _buildpackmeta(newmeta) |
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202 |
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203 |
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204 def parsepackmeta(metabuf): |
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205 """like _parsepackmeta, but convert fields to desired types automatically. |
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206 |
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207 This means, METAKEYFLAG and METAKEYSIZE fields will be converted to |
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208 integers. |
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209 """ |
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210 metadict = _parsepackmeta(metabuf) |
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211 for k, v in metadict.items(): |
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212 if k in _metaitemtypes and int in _metaitemtypes[k]: |
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213 metadict[k] = bin2int(v) |
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214 return metadict |
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215 |
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216 |
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217 def int2bin(n): |
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218 """convert a non-negative integer to raw binary buffer""" |
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219 buf = bytearray() |
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220 while n > 0: |
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221 buf.insert(0, n & 0xFF) |
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222 n >>= 8 |
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223 return bytes(buf) |
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224 |
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225 |
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226 def bin2int(buf): |
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227 """the reverse of int2bin, convert a binary buffer to an integer""" |
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228 x = 0 |
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229 for b in bytearray(buf): |
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230 x <<= 8 |
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231 x |= b |
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232 return x |
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233 |
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234 |
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235 class BadRemotefilelogHeader(error.StorageError): |
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236 """Exception raised when parsing a remotefilelog blob header fails.""" |
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237 |
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238 |
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239 def parsesizeflags(raw): |
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240 """given a remotefilelog blob, return (headersize, rawtextsize, flags) |
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241 |
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242 see remotefilelogserver.createfileblob for the format. |
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243 raise RuntimeError if the content is illformed. |
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244 """ |
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245 flags = revlog.REVIDX_DEFAULT_FLAGS |
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246 size = None |
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247 try: |
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248 index = raw.index(b'\0') |
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249 except ValueError: |
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250 raise BadRemotefilelogHeader( |
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251 "unexpected remotefilelog header: illegal format" |
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252 ) |
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253 header = raw[:index] |
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254 if header.startswith(b'v'): |
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255 # v1 and above, header starts with 'v' |
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256 if header.startswith(b'v1\n'): |
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257 for s in header.split(b'\n'): |
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258 if s.startswith(constants.METAKEYSIZE): |
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259 size = int(s[len(constants.METAKEYSIZE) :]) |
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260 elif s.startswith(constants.METAKEYFLAG): |
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261 flags = int(s[len(constants.METAKEYFLAG) :]) |
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262 else: |
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263 raise BadRemotefilelogHeader( |
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264 b'unsupported remotefilelog header: %s' % header |
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265 ) |
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266 else: |
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267 # v0, str(int(size)) is the header |
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268 size = int(header) |
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269 if size is None: |
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270 raise BadRemotefilelogHeader( |
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271 "unexpected remotefilelog header: no size found" |
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272 ) |
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273 return index + 1, size, flags |
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274 |
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275 |
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276 def buildfileblobheader(size, flags, version=None): |
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277 """return the header of a remotefilelog blob. |
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278 |
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279 see remotefilelogserver.createfileblob for the format. |
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280 approximately the reverse of parsesizeflags. |
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281 |
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282 version could be 0 or 1, or None (auto decide). |
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283 """ |
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284 # choose v0 if flags is empty, otherwise v1 |
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285 if version is None: |
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286 version = int(bool(flags)) |
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287 if version == 1: |
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288 header = b'v1\n%s%d\n%s%d' % ( |
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289 constants.METAKEYSIZE, |
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290 size, |
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291 constants.METAKEYFLAG, |
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292 flags, |
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293 ) |
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294 elif version == 0: |
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295 if flags: |
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296 raise error.ProgrammingError(b'fileblob v0 does not support flag') |
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297 header = b'%d' % size |
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298 else: |
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299 raise error.ProgrammingError(b'unknown fileblob version %d' % version) |
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300 return header |
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301 |
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302 |
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303 def ancestormap(raw): |
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304 offset, size, flags = parsesizeflags(raw) |
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305 start = offset + size |
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306 |
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307 mapping = {} |
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308 while start < len(raw): |
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309 divider = raw.index(b'\0', start + 80) |
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310 |
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311 currentnode = raw[start : (start + 20)] |
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312 p1 = raw[(start + 20) : (start + 40)] |
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313 p2 = raw[(start + 40) : (start + 60)] |
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314 linknode = raw[(start + 60) : (start + 80)] |
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315 copyfrom = raw[(start + 80) : divider] |
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316 |
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317 mapping[currentnode] = (p1, p2, linknode, copyfrom) |
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318 start = divider + 1 |
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319 |
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320 return mapping |
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321 |
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322 |
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323 def readfile(path): |
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324 f = open(path, b'rb') |
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325 try: |
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326 result = f.read() |
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327 |
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328 # we should never have empty files |
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329 if not result: |
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330 os.remove(path) |
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331 raise IOError(b"empty file: %s" % path) |
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332 |
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333 return result |
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334 finally: |
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335 f.close() |
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336 |
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337 |
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338 def unlinkfile(filepath): |
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339 if pycompat.iswindows: |
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340 # On Windows, os.unlink cannnot delete readonly files |
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341 os.chmod(filepath, stat.S_IWUSR) |
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342 os.unlink(filepath) |
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343 |
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344 |
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345 def renamefile(source, destination): |
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346 if pycompat.iswindows: |
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347 # On Windows, os.rename cannot rename readonly files |
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348 # and cannot overwrite destination if it exists |
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349 os.chmod(source, stat.S_IWUSR) |
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350 if os.path.isfile(destination): |
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351 os.chmod(destination, stat.S_IWUSR) |
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352 os.unlink(destination) |
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353 |
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354 os.rename(source, destination) |
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355 |
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356 |
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357 def writefile(path, content, readonly=False): |
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358 dirname, filename = os.path.split(path) |
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359 if not os.path.exists(dirname): |
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360 try: |
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361 os.makedirs(dirname) |
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362 except OSError as ex: |
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363 if ex.errno != errno.EEXIST: |
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364 raise |
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365 |
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366 fd, temp = tempfile.mkstemp(prefix=b'.%s-' % filename, dir=dirname) |
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367 os.close(fd) |
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368 |
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369 try: |
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370 f = util.posixfile(temp, b'wb') |
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371 f.write(content) |
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372 f.close() |
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373 |
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374 if readonly: |
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375 mode = 0o444 |
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376 else: |
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377 # tempfiles are created with 0o600, so we need to manually set the |
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378 # mode. |
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379 oldumask = os.umask(0) |
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380 # there's no way to get the umask without modifying it, so set it |
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381 # back |
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382 os.umask(oldumask) |
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383 mode = ~oldumask |
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384 |
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385 renamefile(temp, path) |
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386 os.chmod(path, mode) |
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387 except Exception: |
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388 try: |
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389 unlinkfile(temp) |
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390 except OSError: |
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391 pass |
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392 raise |
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393 |
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394 |
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395 def sortnodes(nodes, parentfunc): |
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396 """Topologically sorts the nodes, using the parentfunc to find |
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397 the parents of nodes.""" |
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398 nodes = set(nodes) |
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399 childmap = {} |
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400 parentmap = {} |
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401 roots = [] |
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402 |
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403 # Build a child and parent map |
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404 for n in nodes: |
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405 parents = [p for p in parentfunc(n) if p in nodes] |
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406 parentmap[n] = set(parents) |
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407 for p in parents: |
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408 childmap.setdefault(p, set()).add(n) |
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409 if not parents: |
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410 roots.append(n) |
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411 |
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412 roots.sort() |
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413 # Process roots, adding children to the queue as they become roots |
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414 results = [] |
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415 while roots: |
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416 n = roots.pop(0) |
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417 results.append(n) |
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418 if n in childmap: |
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419 children = childmap[n] |
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420 for c in children: |
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421 childparents = parentmap[c] |
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422 childparents.remove(n) |
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423 if len(childparents) == 0: |
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424 # insert at the beginning, that way child nodes |
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425 # are likely to be output immediately after their |
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426 # parents. This gives better compression results. |
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427 roots.insert(0, c) |
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428 |
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429 return results |
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430 |
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431 |
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432 def readexactly(stream, n): |
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433 '''read n bytes from stream.read and abort if less was available''' |
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434 s = stream.read(n) |
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435 if len(s) < n: |
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436 raise error.Abort( |
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437 _(b"stream ended unexpectedly (got %d bytes, expected %d)") |
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438 % (len(s), n) |
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439 ) |
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440 return s |
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441 |
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442 |
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443 def readunpack(stream, fmt): |
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444 data = readexactly(stream, struct.calcsize(fmt)) |
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445 return struct.unpack(fmt, data) |
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446 |
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447 |
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448 def readpath(stream): |
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449 rawlen = readexactly(stream, constants.FILENAMESIZE) |
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450 pathlen = struct.unpack(constants.FILENAMESTRUCT, rawlen)[0] |
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451 return readexactly(stream, pathlen) |
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452 |
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453 |
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454 def readnodelist(stream): |
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455 rawlen = readexactly(stream, constants.NODECOUNTSIZE) |
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456 nodecount = struct.unpack(constants.NODECOUNTSTRUCT, rawlen)[0] |
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457 for i in pycompat.xrange(nodecount): |
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458 yield readexactly(stream, constants.NODESIZE) |
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459 |
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460 |
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461 def readpathlist(stream): |
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462 rawlen = readexactly(stream, constants.PATHCOUNTSIZE) |
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463 pathcount = struct.unpack(constants.PATHCOUNTSTRUCT, rawlen)[0] |
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464 for i in pycompat.xrange(pathcount): |
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465 yield readpath(stream) |
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466 |
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467 |
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468 def getgid(groupname): |
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469 try: |
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470 gid = grp.getgrnam(pycompat.fsdecode(groupname)).gr_gid |
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471 return gid |
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472 except KeyError: |
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473 return None |
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474 |
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475 |
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476 def setstickygroupdir(path, gid, warn=None): |
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477 if gid is None: |
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478 return |
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479 try: |
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480 os.chown(path, -1, gid) |
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481 os.chmod(path, 0o2775) |
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482 except (IOError, OSError) as ex: |
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483 if warn: |
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484 warn(_(b'unable to chown/chmod on %s: %s\n') % (path, ex)) |
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485 |
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486 |
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487 def mkstickygroupdir(ui, path): |
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488 """Creates the given directory (if it doesn't exist) and give it a |
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489 particular group with setgid enabled.""" |
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490 gid = None |
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491 groupname = ui.config(b"remotefilelog", b"cachegroup") |
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492 if groupname: |
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493 gid = getgid(groupname) |
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494 if gid is None: |
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495 ui.warn(_(b'unable to resolve group name: %s\n') % groupname) |
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496 |
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497 # we use a single stat syscall to test the existence and mode / group bit |
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498 st = None |
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499 try: |
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500 st = os.stat(path) |
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501 except OSError: |
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502 pass |
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503 |
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504 if st: |
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505 # exists |
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506 if (st.st_mode & 0o2775) != 0o2775 or st.st_gid != gid: |
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507 # permission needs to be fixed |
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508 setstickygroupdir(path, gid, ui.warn) |
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509 return |
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510 |
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511 oldumask = os.umask(0o002) |
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512 try: |
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513 missingdirs = [path] |
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514 path = os.path.dirname(path) |
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515 while path and not os.path.exists(path): |
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516 missingdirs.append(path) |
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517 path = os.path.dirname(path) |
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518 |
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519 for path in reversed(missingdirs): |
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520 try: |
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521 os.mkdir(path) |
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522 except OSError as ex: |
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523 if ex.errno != errno.EEXIST: |
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524 raise |
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525 |
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526 for path in missingdirs: |
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527 setstickygroupdir(path, gid, ui.warn) |
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528 finally: |
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529 os.umask(oldumask) |
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530 |
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531 |
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532 def getusername(ui): |
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533 try: |
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534 return stringutil.shortuser(ui.username()) |
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535 except Exception: |
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536 return b'unknown' |
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537 |
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538 |
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539 def getreponame(ui): |
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540 reponame = ui.config(b'paths', b'default') |
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541 if reponame: |
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542 return os.path.basename(reponame) |
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543 return b"unknown" |