Mercurial > hg
annotate mercurial/changelog.py @ 44712:a825bfbf6642
templatekw: cache mergestate even if merge is not ongoing
While playing with eBPF, I noticed .hg/merge/state{,2} files were tried
to open() for each revision. That's not healthy. Let's cache the "inactive"
state as well.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Wed, 15 Apr 2020 23:11:55 +0900 |
parents | e147748f750b |
children | 5e3c718692bb |
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1095 | 1 # changelog.py - changelog class for mercurial |
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2 # |
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3 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 from .i18n import _ |
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11 from .node import ( |
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12 bin, |
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13 hex, |
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14 nullid, |
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15 ) |
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16 from .thirdparty import attr |
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17 |
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18 from . import ( |
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19 copies, |
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20 encoding, |
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21 error, |
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22 pycompat, |
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23 revlog, |
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24 ) |
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25 from .utils import ( |
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26 dateutil, |
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27 stringutil, |
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28 ) |
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29 |
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30 from .revlogutils import sidedata as sidedatamod |
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31 |
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32 _defaultextra = {b'branch': b'default'} |
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33 |
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34 |
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35 def _string_escape(text): |
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36 """ |
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37 >>> from .pycompat import bytechr as chr |
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38 >>> d = {b'nl': chr(10), b'bs': chr(92), b'cr': chr(13), b'nul': chr(0)} |
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39 >>> s = b"ab%(nl)scd%(bs)s%(bs)sn%(nul)s12ab%(cr)scd%(bs)s%(nl)s" % d |
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40 >>> s |
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41 'ab\\ncd\\\\\\\\n\\x0012ab\\rcd\\\\\\n' |
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42 >>> res = _string_escape(s) |
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43 >>> s == _string_unescape(res) |
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44 True |
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45 """ |
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46 # subset of the string_escape codec |
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47 text = ( |
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48 text.replace(b'\\', b'\\\\') |
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49 .replace(b'\n', b'\\n') |
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50 .replace(b'\r', b'\\r') |
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51 ) |
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52 return text.replace(b'\0', b'\\0') |
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53 |
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54 |
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55 def _string_unescape(text): |
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56 if b'\\0' in text: |
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57 # fix up \0 without getting into trouble with \\0 |
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58 text = text.replace(b'\\\\', b'\\\\\n') |
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59 text = text.replace(b'\\0', b'\0') |
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60 text = text.replace(b'\n', b'') |
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61 return stringutil.unescapestr(text) |
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62 |
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63 |
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64 def decodeextra(text): |
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65 """ |
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66 >>> from .pycompat import bytechr as chr |
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67 >>> sorted(decodeextra(encodeextra({b'foo': b'bar', b'baz': chr(0) + b'2'}) |
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68 ... ).items()) |
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69 [('baz', '\\x002'), ('branch', 'default'), ('foo', 'bar')] |
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70 >>> sorted(decodeextra(encodeextra({b'foo': b'bar', |
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71 ... b'baz': chr(92) + chr(0) + b'2'}) |
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72 ... ).items()) |
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73 [('baz', '\\\\\\x002'), ('branch', 'default'), ('foo', 'bar')] |
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74 """ |
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75 extra = _defaultextra.copy() |
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76 for l in text.split(b'\0'): |
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77 if l: |
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78 k, v = _string_unescape(l).split(b':', 1) |
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79 extra[k] = v |
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80 return extra |
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81 |
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82 |
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83 def encodeextra(d): |
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84 # keys must be sorted to produce a deterministic changelog entry |
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85 items = [_string_escape(b'%s:%s' % (k, d[k])) for k in sorted(d)] |
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86 return b"\0".join(items) |
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87 |
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88 |
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89 def stripdesc(desc): |
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90 """strip trailing whitespace and leading and trailing empty lines""" |
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91 return b'\n'.join([l.rstrip() for l in desc.splitlines()]).strip(b'\n') |
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92 |
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93 |
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94 class appender(object): |
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95 '''the changelog index must be updated last on disk, so we use this class |
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96 to delay writes to it''' |
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97 |
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98 def __init__(self, vfs, name, mode, buf): |
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99 self.data = buf |
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100 fp = vfs(name, mode) |
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101 self.fp = fp |
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102 self.offset = fp.tell() |
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103 self.size = vfs.fstat(fp).st_size |
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104 self._end = self.size |
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105 |
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106 def end(self): |
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107 return self._end |
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108 |
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109 def tell(self): |
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110 return self.offset |
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111 |
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112 def flush(self): |
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113 pass |
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114 |
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115 @property |
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116 def closed(self): |
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117 return self.fp.closed |
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118 |
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119 def close(self): |
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120 self.fp.close() |
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121 |
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122 def seek(self, offset, whence=0): |
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123 '''virtual file offset spans real file and data''' |
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124 if whence == 0: |
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125 self.offset = offset |
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126 elif whence == 1: |
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127 self.offset += offset |
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128 elif whence == 2: |
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129 self.offset = self.end() + offset |
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130 if self.offset < self.size: |
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131 self.fp.seek(self.offset) |
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132 |
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133 def read(self, count=-1): |
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134 '''only trick here is reads that span real file and data''' |
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135 ret = b"" |
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136 if self.offset < self.size: |
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137 s = self.fp.read(count) |
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138 ret = s |
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139 self.offset += len(s) |
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140 if count > 0: |
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141 count -= len(s) |
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142 if count != 0: |
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143 doff = self.offset - self.size |
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144 self.data.insert(0, b"".join(self.data)) |
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145 del self.data[1:] |
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146 s = self.data[0][doff : doff + count] |
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147 self.offset += len(s) |
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148 ret += s |
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149 return ret |
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150 |
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151 def write(self, s): |
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152 self.data.append(bytes(s)) |
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153 self.offset += len(s) |
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154 self._end += len(s) |
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155 |
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156 def __enter__(self): |
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157 self.fp.__enter__() |
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158 return self |
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159 |
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160 def __exit__(self, *args): |
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161 return self.fp.__exit__(*args) |
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162 |
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163 |
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164 class _divertopener(object): |
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165 def __init__(self, opener, target): |
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166 self._opener = opener |
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167 self._target = target |
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168 |
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169 def __call__(self, name, mode=b'r', checkambig=False, **kwargs): |
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170 if name != self._target: |
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171 return self._opener(name, mode, **kwargs) |
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172 return self._opener(name + b".a", mode, **kwargs) |
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173 |
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174 def __getattr__(self, attr): |
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175 return getattr(self._opener, attr) |
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176 |
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177 |
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178 def _delayopener(opener, target, buf): |
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179 """build an opener that stores chunks in 'buf' instead of 'target'""" |
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180 |
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181 def _delay(name, mode=b'r', checkambig=False, **kwargs): |
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182 if name != target: |
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183 return opener(name, mode, **kwargs) |
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184 assert not kwargs |
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185 return appender(opener, name, mode, buf) |
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186 |
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187 return _delay |
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188 |
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189 |
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190 @attr.s |
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191 class _changelogrevision(object): |
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192 # Extensions might modify _defaultextra, so let the constructor below pass |
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193 # it in |
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194 extra = attr.ib() |
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195 manifest = attr.ib(default=nullid) |
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196 user = attr.ib(default=b'') |
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197 date = attr.ib(default=(0, 0)) |
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198 files = attr.ib(default=attr.Factory(list)) |
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199 filesadded = attr.ib(default=None) |
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200 filesremoved = attr.ib(default=None) |
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201 p1copies = attr.ib(default=None) |
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202 p2copies = attr.ib(default=None) |
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203 description = attr.ib(default=b'') |
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204 |
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205 |
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206 class changelogrevision(object): |
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207 """Holds results of a parsed changelog revision. |
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208 |
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209 Changelog revisions consist of multiple pieces of data, including |
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210 the manifest node, user, and date. This object exposes a view into |
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211 the parsed object. |
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212 """ |
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213 |
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214 __slots__ = ( |
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215 '_offsets', |
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216 '_text', |
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217 '_sidedata', |
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218 '_cpsd', |
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219 ) |
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220 |
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221 def __new__(cls, text, sidedata, cpsd): |
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222 if not text: |
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223 return _changelogrevision(extra=_defaultextra) |
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224 |
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225 self = super(changelogrevision, cls).__new__(cls) |
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226 # We could return here and implement the following as an __init__. |
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227 # But doing it here is equivalent and saves an extra function call. |
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228 |
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229 # format used: |
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230 # nodeid\n : manifest node in ascii |
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231 # user\n : user, no \n or \r allowed |
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232 # time tz extra\n : date (time is int or float, timezone is int) |
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233 # : extra is metadata, encoded and separated by '\0' |
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234 # : older versions ignore it |
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235 # files\n\n : files modified by the cset, no \n or \r allowed |
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236 # (.*) : comment (free text, ideally utf-8) |
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237 # |
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238 # changelog v0 doesn't use extra |
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239 |
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240 nl1 = text.index(b'\n') |
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241 nl2 = text.index(b'\n', nl1 + 1) |
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242 nl3 = text.index(b'\n', nl2 + 1) |
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243 |
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244 # The list of files may be empty. Which means nl3 is the first of the |
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245 # double newline that precedes the description. |
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246 if text[nl3 + 1 : nl3 + 2] == b'\n': |
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247 doublenl = nl3 |
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248 else: |
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249 doublenl = text.index(b'\n\n', nl3 + 1) |
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250 |
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251 self._offsets = (nl1, nl2, nl3, doublenl) |
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252 self._text = text |
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253 self._sidedata = sidedata |
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254 self._cpsd = cpsd |
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255 |
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256 return self |
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257 |
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258 @property |
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259 def manifest(self): |
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260 return bin(self._text[0 : self._offsets[0]]) |
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261 |
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262 @property |
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263 def user(self): |
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264 off = self._offsets |
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265 return encoding.tolocal(self._text[off[0] + 1 : off[1]]) |
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266 |
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267 @property |
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268 def _rawdate(self): |
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269 off = self._offsets |
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270 dateextra = self._text[off[1] + 1 : off[2]] |
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271 return dateextra.split(b' ', 2)[0:2] |
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272 |
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273 @property |
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274 def _rawextra(self): |
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275 off = self._offsets |
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276 dateextra = self._text[off[1] + 1 : off[2]] |
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277 fields = dateextra.split(b' ', 2) |
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278 if len(fields) != 3: |
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279 return None |
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280 |
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281 return fields[2] |
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282 |
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283 @property |
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284 def date(self): |
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285 raw = self._rawdate |
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286 time = float(raw[0]) |
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287 # Various tools did silly things with the timezone. |
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288 try: |
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289 timezone = int(raw[1]) |
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290 except ValueError: |
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291 timezone = 0 |
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292 |
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293 return time, timezone |
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294 |
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295 @property |
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296 def extra(self): |
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297 raw = self._rawextra |
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298 if raw is None: |
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299 return _defaultextra |
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300 |
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301 return decodeextra(raw) |
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302 |
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303 @property |
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304 def files(self): |
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305 off = self._offsets |
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306 if off[2] == off[3]: |
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307 return [] |
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308 |
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309 return self._text[off[2] + 1 : off[3]].split(b'\n') |
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310 |
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311 @property |
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312 def filesadded(self): |
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313 if self._cpsd: |
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314 rawindices = self._sidedata.get(sidedatamod.SD_FILESADDED) |
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315 if not rawindices: |
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316 return [] |
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317 else: |
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318 rawindices = self.extra.get(b'filesadded') |
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319 if rawindices is None: |
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320 return None |
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321 return copies.decodefileindices(self.files, rawindices) |
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322 |
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323 @property |
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324 def filesremoved(self): |
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325 if self._cpsd: |
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326 rawindices = self._sidedata.get(sidedatamod.SD_FILESREMOVED) |
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327 if not rawindices: |
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328 return [] |
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329 else: |
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330 rawindices = self.extra.get(b'filesremoved') |
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331 if rawindices is None: |
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332 return None |
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333 return copies.decodefileindices(self.files, rawindices) |
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334 |
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335 @property |
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336 def p1copies(self): |
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337 if self._cpsd: |
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338 rawcopies = self._sidedata.get(sidedatamod.SD_P1COPIES) |
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339 if not rawcopies: |
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340 return {} |
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341 else: |
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342 rawcopies = self.extra.get(b'p1copies') |
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343 if rawcopies is None: |
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344 return None |
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345 return copies.decodecopies(self.files, rawcopies) |
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346 |
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347 @property |
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348 def p2copies(self): |
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349 if self._cpsd: |
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350 rawcopies = self._sidedata.get(sidedatamod.SD_P2COPIES) |
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351 if not rawcopies: |
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352 return {} |
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353 else: |
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354 rawcopies = self.extra.get(b'p2copies') |
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355 if rawcopies is None: |
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356 return None |
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357 return copies.decodecopies(self.files, rawcopies) |
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358 |
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359 @property |
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360 def description(self): |
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361 return encoding.tolocal(self._text[self._offsets[3] + 2 :]) |
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362 |
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363 |
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364 class changelog(revlog.revlog): |
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365 def __init__(self, opener, trypending=False): |
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366 """Load a changelog revlog using an opener. |
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367 |
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368 If ``trypending`` is true, we attempt to load the index from a |
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369 ``00changelog.i.a`` file instead of the default ``00changelog.i``. |
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370 The ``00changelog.i.a`` file contains index (and possibly inline |
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371 revision) data for a transaction that hasn't been finalized yet. |
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372 It exists in a separate file to facilitate readers (such as |
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373 hooks processes) accessing data before a transaction is finalized. |
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374 """ |
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375 if trypending and opener.exists(b'00changelog.i.a'): |
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376 indexfile = b'00changelog.i.a' |
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377 else: |
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378 indexfile = b'00changelog.i' |
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379 |
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380 datafile = b'00changelog.d' |
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381 revlog.revlog.__init__( |
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382 self, |
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383 opener, |
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384 indexfile, |
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385 datafile=datafile, |
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386 checkambig=True, |
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387 mmaplargeindex=True, |
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388 persistentnodemap=opener.options.get( |
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389 b'exp-persistent-nodemap', False |
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390 ), |
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391 ) |
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392 |
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393 if self._initempty and (self.version & 0xFFFF == revlog.REVLOGV1): |
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394 # changelogs don't benefit from generaldelta. |
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395 |
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396 self.version &= ~revlog.FLAG_GENERALDELTA |
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397 self._generaldelta = False |
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398 |
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399 # Delta chains for changelogs tend to be very small because entries |
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400 # tend to be small and don't delta well with each. So disable delta |
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|
401 # chains. |
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402 self._storedeltachains = False |
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|
403 |
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404 self._realopener = opener |
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405 self._delayed = False |
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406 self._delaybuf = None |
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407 self._divert = False |
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408 self.filteredrevs = frozenset() |
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409 self._copiesstorage = opener.options.get(b'copies-storage') |
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|
410 |
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411 def delayupdate(self, tr): |
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|
412 """delay visibility of index updates to other readers""" |
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413 |
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414 if not self._delayed: |
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415 if len(self) == 0: |
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416 self._divert = True |
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417 if self._realopener.exists(self.indexfile + b'.a'): |
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418 self._realopener.unlink(self.indexfile + b'.a') |
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419 self.opener = _divertopener(self._realopener, self.indexfile) |
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420 else: |
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421 self._delaybuf = [] |
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422 self.opener = _delayopener( |
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423 self._realopener, self.indexfile, self._delaybuf |
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424 ) |
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425 self._delayed = True |
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426 tr.addpending(b'cl-%i' % id(self), self._writepending) |
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427 tr.addfinalize(b'cl-%i' % id(self), self._finalize) |
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428 |
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429 def _finalize(self, tr): |
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|
430 """finalize index updates""" |
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|
431 self._delayed = False |
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432 self.opener = self._realopener |
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433 # move redirected index data back into place |
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434 if self._divert: |
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|
435 assert not self._delaybuf |
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|
436 tmpname = self.indexfile + b".a" |
19898
3f92e749d381
changelog: use "vfs.rename()" instead of "util.rename()"
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|
437 nfile = self.opener.open(tmpname) |
14207
c1cca38818b9
changelog: fixes leaked file handle
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parents:
14004
diff
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|
438 nfile.close() |
29999
003c41edc5f5
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FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
29997
diff
changeset
|
439 self.opener.rename(tmpname, self.indexfile, checkambig=True) |
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|
440 elif self._delaybuf: |
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441 fp = self.opener(self.indexfile, b'a', checkambig=True) |
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442 fp.write(b"".join(self._delaybuf)) |
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443 fp.close() |
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444 self._delaybuf = None |
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445 self._divert = False |
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|
446 # split when we're done |
35974
9ba1d0c724e2
revlog: rename 'self.checkinlinesize' into '_enforceinlinesize'
Boris Feld <boris.feld@octobus.net>
parents:
35963
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|
447 self._enforceinlinesize(tr) |
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|
448 |
23280
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transaction: pass the transaction to 'pending' callback
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|
449 def _writepending(self, tr): |
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parents:
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|
450 """create a file containing the unfinalized state for |
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cleanup: fix docstring formatting
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parents:
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diff
changeset
|
451 pretxnchangegroup""" |
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|
452 if self._delaybuf: |
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|
453 # make a temporary copy of the index |
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|
454 fp1 = self._realopener(self.indexfile) |
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|
455 pendingfilename = self.indexfile + b".a" |
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parents:
23281
diff
changeset
|
456 # register as a temp file to ensure cleanup on failure |
e44399c494ab
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|
457 tr.registertmp(pendingfilename) |
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|
458 # write existing data |
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459 fp2 = self._realopener(pendingfilename, b"w") |
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|
460 fp2.write(fp1.read()) |
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461 # add pending data |
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462 fp2.write(b"".join(self._delaybuf)) |
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|
463 fp2.close() |
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|
464 # switch modes so finalize can simply rename |
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|
465 self._delaybuf = None |
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changeset
|
466 self._divert = True |
23201
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|
467 self.opener = _divertopener(self._realopener, self.indexfile) |
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|
468 |
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469 if self._divert: |
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470 return True |
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|
471 |
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|
472 return False |
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changeset
|
473 |
35974
9ba1d0c724e2
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parents:
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474 def _enforceinlinesize(self, tr, fp=None): |
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475 if not self._delayed: |
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parents:
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|
476 revlog.revlog._enforceinlinesize(self, tr, fp) |
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|
477 |
5744
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changelog: remove extract function
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478 def read(self, node): |
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479 """Obtain data from a parsed changelog revision. |
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480 |
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481 Returns a 6-tuple of: |
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482 |
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|
483 - manifest node in binary |
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484 - author/user as a localstr |
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|
485 - date as a 2-tuple of (time, timezone) |
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|
486 - list of files |
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|
487 - commit message as a localstr |
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|
488 - dict of extra metadata |
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|
489 |
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|
490 Unless you need to access all fields, consider calling |
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|
491 ``changelogrevision`` instead, as it is faster for partial object |
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|
492 access. |
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493 """ |
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494 d, s = self._revisiondata(node) |
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|
495 c = changelogrevision( |
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496 d, s, self._copiesstorage == b'changeset-sidedata' |
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497 ) |
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498 return (c.manifest, c.user, c.date, c.files, c.description, c.extra) |
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|
499 |
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500 def changelogrevision(self, nodeorrev): |
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501 """Obtain a ``changelogrevision`` for a node or revision.""" |
43143
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502 text, sidedata = self._revisiondata(nodeorrev) |
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503 return changelogrevision( |
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|
504 text, sidedata, self._copiesstorage == b'changeset-sidedata' |
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|
505 ) |
0
9117c6561b0b
Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff
changeset
|
506 |
27439
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|
507 def readfiles(self, node): |
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|
508 """ |
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changeset
|
509 short version of read that only returns the files modified by the cset |
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|
510 """ |
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|
511 text = self.revision(node) |
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changeset
|
512 if not text: |
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changeset
|
513 return [] |
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|
514 last = text.index(b"\n\n") |
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|
515 l = text[:last].split(b'\n') |
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|
516 return l[3:] |
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|
517 |
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|
518 def add( |
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|
519 self, |
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|
520 manifest, |
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|
521 files, |
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changeset
|
522 desc, |
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|
523 transaction, |
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|
524 p1, |
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|
525 p2, |
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|
526 user, |
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|
527 date=None, |
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|
528 extra=None, |
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|
529 p1copies=None, |
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|
530 p2copies=None, |
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|
531 filesadded=None, |
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|
532 filesremoved=None, |
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|
533 ): |
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parents:
10420
diff
changeset
|
534 # Convert to UTF-8 encoded bytestrings as the very first |
bd23d5f28bbb
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parents:
10420
diff
changeset
|
535 # thing: calling any method on a localstr object will turn it |
bd23d5f28bbb
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10420
diff
changeset
|
536 # into a str object and the cached UTF-8 string is thus lost. |
bd23d5f28bbb
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parents:
10420
diff
changeset
|
537 user, desc = encoding.fromlocal(user), encoding.fromlocal(desc) |
bd23d5f28bbb
changelog: convert user and desc from local encoding early
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parents:
10420
diff
changeset
|
538 |
7035
9d023ef7b467
forbid username with '\n' at the changelog level
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
6259
diff
changeset
|
539 user = user.strip() |
8424
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parents:
7807
diff
changeset
|
540 # An empty username or a username with a "\n" will make the |
c5b3d3e30de7
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changeset
|
541 # revision text contain two "\n\n" sequences -> corrupt |
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changeset
|
542 # repository since read cannot unpack the revision. |
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|
543 if not user: |
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|
544 raise error.StorageError(_(b"empty username")) |
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|
545 if b"\n" in user: |
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|
546 raise error.StorageError( |
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|
547 _(b"username %r contains a newline") % pycompat.bytestr(user) |
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|
548 ) |
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|
549 |
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|
550 desc = stripdesc(desc) |
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|
551 |
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|
552 if date: |
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|
553 parseddate = b"%d %d" % dateutil.parsedate(date) |
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554 else: |
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|
555 parseddate = b"%d %d" % dateutil.makedate() |
10417
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changeset
|
556 if extra: |
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|
557 branch = extra.get(b"branch") |
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|
558 if branch in (b"default", b""): |
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|
559 del extra[b"branch"] |
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|
560 elif branch in (b".", b"null", b"tip"): |
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561 raise error.StorageError( |
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562 _(b'the name \'%s\' is reserved') % branch |
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563 ) |
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564 sortedfiles = sorted(files) |
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565 sidedata = None |
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566 if extra is not None: |
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567 for name in ( |
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568 b'p1copies', |
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569 b'p2copies', |
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570 b'filesadded', |
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571 b'filesremoved', |
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572 ): |
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573 extra.pop(name, None) |
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574 if p1copies is not None: |
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575 p1copies = copies.encodecopies(sortedfiles, p1copies) |
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576 if p2copies is not None: |
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577 p2copies = copies.encodecopies(sortedfiles, p2copies) |
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578 if filesadded is not None: |
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579 filesadded = copies.encodefileindices(sortedfiles, filesadded) |
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580 if filesremoved is not None: |
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581 filesremoved = copies.encodefileindices(sortedfiles, filesremoved) |
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582 if self._copiesstorage == b'extra': |
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583 extrasentries = p1copies, p2copies, filesadded, filesremoved |
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584 if extra is None and any(x is not None for x in extrasentries): |
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585 extra = {} |
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586 if p1copies is not None: |
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587 extra[b'p1copies'] = p1copies |
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588 if p2copies is not None: |
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589 extra[b'p2copies'] = p2copies |
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590 if filesadded is not None: |
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591 extra[b'filesadded'] = filesadded |
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592 if filesremoved is not None: |
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593 extra[b'filesremoved'] = filesremoved |
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594 elif self._copiesstorage == b'changeset-sidedata': |
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595 sidedata = {} |
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596 if p1copies: |
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597 sidedata[sidedatamod.SD_P1COPIES] = p1copies |
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598 if p2copies: |
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599 sidedata[sidedatamod.SD_P2COPIES] = p2copies |
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600 if filesadded: |
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601 sidedata[sidedatamod.SD_FILESADDED] = filesadded |
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602 if filesremoved: |
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603 sidedata[sidedatamod.SD_FILESREMOVED] = filesremoved |
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604 if not sidedata: |
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605 sidedata = None |
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606 |
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607 if extra: |
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608 extra = encodeextra(extra) |
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609 parseddate = b"%s %s" % (parseddate, extra) |
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610 l = [hex(manifest), user, parseddate] + sortedfiles + [b"", desc] |
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611 text = b"\n".join(l) |
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612 return self.addrevision( |
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613 text, transaction, len(self), p1, p2, sidedata=sidedata |
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614 ) |
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615 |
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616 def branchinfo(self, rev): |
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617 """return the branch name and open/close state of a revision |
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618 |
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619 This function exists because creating a changectx object |
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620 just to access this is costly.""" |
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621 extra = self.read(rev)[5] |
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622 return encoding.tolocal(extra.get(b"branch")), b'close' in extra |
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623 |
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624 def _nodeduplicatecallback(self, transaction, node): |
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625 # keep track of revisions that got "re-added", eg: unbunde of know rev. |
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626 # |
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627 # We track them in a list to preserve their order from the source bundle |
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628 duplicates = transaction.changes.setdefault(b'revduplicates', []) |
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629 duplicates.append(self.rev(node)) |