Mercurial > public > mercurial-scm > hg
annotate mercurial/pure/parsers.py @ 47249:130c9f7ed914
revlog: add a "data compression mode" entry in the index tuple
That will make it possible to keep track of compression information in the
revlog index, opening the way to more efficient revision restoration (in native
code, but the python usage is already defeating performance work).
We start with adding a new entry to the index tuple, using a value matching the
current behavior. We will introduce storage and other value in later changesets.
Differential Revision: https://phab.mercurial-scm.org/D10646
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Mon, 03 May 2021 18:19:16 +0200 |
parents | 78230d036e5d |
children | 6bfa6c2c5f15 |
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1 # parsers.py - Python implementation of parsers.c |
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2 # |
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3 # Copyright 2009 Olivia Mackall <olivia@selenic.com> and others |
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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 import struct |
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11 import zlib |
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12 |
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13 from ..node import ( |
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14 nullrev, |
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15 sha1nodeconstants, |
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16 ) |
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17 from .. import ( |
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18 error, |
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19 pycompat, |
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20 util, |
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21 ) |
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22 |
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23 from ..revlogutils import nodemap as nodemaputil |
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24 from ..revlogutils import constants as revlog_constants |
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25 |
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26 stringio = pycompat.bytesio |
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27 |
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28 |
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29 _pack = struct.pack |
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30 _unpack = struct.unpack |
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31 _compress = zlib.compress |
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32 _decompress = zlib.decompress |
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33 |
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34 # Some code below makes tuples directly because it's more convenient. However, |
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35 # code outside this module should always use dirstatetuple. |
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36 def dirstatetuple(*x): |
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37 # x is a tuple |
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38 return x |
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39 |
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40 |
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41 def gettype(q): |
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42 return int(q & 0xFFFF) |
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43 |
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44 |
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45 def offset_type(offset, type): |
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46 return int(int(offset) << 16 | type) |
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47 |
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48 |
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49 class BaseIndexObject(object): |
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50 # Format of an index entry according to Python's `struct` language |
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51 index_format = revlog_constants.INDEX_ENTRY_V1 |
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52 # Size of a C unsigned long long int, platform independent |
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53 big_int_size = struct.calcsize(b'>Q') |
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54 # Size of a C long int, platform independent |
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55 int_size = struct.calcsize(b'>i') |
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56 # An empty index entry, used as a default value to be overridden, or nullrev |
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57 null_item = ( |
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58 0, |
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59 0, |
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60 0, |
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61 -1, |
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62 -1, |
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63 -1, |
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64 -1, |
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65 sha1nodeconstants.nullid, |
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66 0, |
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67 0, |
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68 revlog_constants.COMP_MODE_INLINE, |
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69 ) |
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70 |
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71 @util.propertycache |
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72 def entry_size(self): |
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73 return self.index_format.size |
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74 |
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75 @property |
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76 def nodemap(self): |
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77 msg = b"index.nodemap is deprecated, use index.[has_node|rev|get_rev]" |
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78 util.nouideprecwarn(msg, b'5.3', stacklevel=2) |
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79 return self._nodemap |
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80 |
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81 @util.propertycache |
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82 def _nodemap(self): |
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83 nodemap = nodemaputil.NodeMap({sha1nodeconstants.nullid: nullrev}) |
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84 for r in range(0, len(self)): |
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85 n = self[r][7] |
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86 nodemap[n] = r |
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87 return nodemap |
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88 |
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89 def has_node(self, node): |
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90 """return True if the node exist in the index""" |
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91 return node in self._nodemap |
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92 |
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93 def rev(self, node): |
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94 """return a revision for a node |
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95 |
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96 If the node is unknown, raise a RevlogError""" |
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97 return self._nodemap[node] |
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98 |
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99 def get_rev(self, node): |
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100 """return a revision for a node |
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101 |
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102 If the node is unknown, return None""" |
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103 return self._nodemap.get(node) |
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104 |
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105 def _stripnodes(self, start): |
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106 if '_nodemap' in vars(self): |
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107 for r in range(start, len(self)): |
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108 n = self[r][7] |
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109 del self._nodemap[n] |
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110 |
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111 def clearcaches(self): |
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112 self.__dict__.pop('_nodemap', None) |
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113 |
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114 def __len__(self): |
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115 return self._lgt + len(self._extra) |
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116 |
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117 def append(self, tup): |
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118 if '_nodemap' in vars(self): |
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119 self._nodemap[tup[7]] = len(self) |
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120 data = self._pack_entry(tup) |
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121 self._extra.append(data) |
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122 |
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123 def _pack_entry(self, entry): |
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124 assert entry[8] == 0 |
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125 assert entry[9] == 0 |
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126 return self.index_format.pack(*entry[:8]) |
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127 |
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128 def _check_index(self, i): |
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129 if not isinstance(i, int): |
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130 raise TypeError(b"expecting int indexes") |
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131 if i < 0 or i >= len(self): |
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132 raise IndexError |
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133 |
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134 def __getitem__(self, i): |
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135 if i == -1: |
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136 return self.null_item |
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137 self._check_index(i) |
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138 if i >= self._lgt: |
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139 data = self._extra[i - self._lgt] |
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140 else: |
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141 index = self._calculate_index(i) |
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142 data = self._data[index : index + self.entry_size] |
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143 r = self._unpack_entry(data) |
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144 if self._lgt and i == 0: |
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145 r = (offset_type(0, gettype(r[0])),) + r[1:] |
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146 return r |
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147 |
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148 def _unpack_entry(self, data): |
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149 r = self.index_format.unpack(data) |
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150 r = r + (0, 0, revlog_constants.COMP_MODE_INLINE) |
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151 return r |
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152 |
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153 def pack_header(self, header): |
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154 """pack header information as binary""" |
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155 v_fmt = revlog_constants.INDEX_HEADER |
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156 return v_fmt.pack(header) |
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157 |
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158 def entry_binary(self, rev): |
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159 """return the raw binary string representing a revision""" |
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160 entry = self[rev] |
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161 p = revlog_constants.INDEX_ENTRY_V1.pack(*entry[:8]) |
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162 if rev == 0: |
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163 p = p[revlog_constants.INDEX_HEADER.size :] |
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164 return p |
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165 |
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166 |
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167 class IndexObject(BaseIndexObject): |
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168 def __init__(self, data): |
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169 assert len(data) % self.entry_size == 0, ( |
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170 len(data), |
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171 self.entry_size, |
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172 len(data) % self.entry_size, |
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173 ) |
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174 self._data = data |
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175 self._lgt = len(data) // self.entry_size |
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176 self._extra = [] |
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177 |
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178 def _calculate_index(self, i): |
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179 return i * self.entry_size |
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181 def __delitem__(self, i): |
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182 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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183 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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184 i = i.start |
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185 self._check_index(i) |
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186 self._stripnodes(i) |
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187 if i < self._lgt: |
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188 self._data = self._data[: i * self.entry_size] |
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189 self._lgt = i |
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190 self._extra = [] |
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191 else: |
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192 self._extra = self._extra[: i - self._lgt] |
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193 |
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194 |
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195 class PersistentNodeMapIndexObject(IndexObject): |
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196 """a Debug oriented class to test persistent nodemap |
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197 |
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198 We need a simple python object to test API and higher level behavior. See |
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199 the Rust implementation for more serious usage. This should be used only |
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200 through the dedicated `devel.persistent-nodemap` config. |
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201 """ |
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202 |
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203 def nodemap_data_all(self): |
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204 """Return bytes containing a full serialization of a nodemap |
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205 |
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206 The nodemap should be valid for the full set of revisions in the |
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207 index.""" |
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208 return nodemaputil.persistent_data(self) |
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209 |
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210 def nodemap_data_incremental(self): |
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211 """Return bytes containing a incremental update to persistent nodemap |
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212 |
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213 This containst the data for an append-only update of the data provided |
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214 in the last call to `update_nodemap_data`. |
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215 """ |
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216 if self._nm_root is None: |
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217 return None |
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218 docket = self._nm_docket |
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219 changed, data = nodemaputil.update_persistent_data( |
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220 self, self._nm_root, self._nm_max_idx, self._nm_docket.tip_rev |
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221 ) |
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222 |
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223 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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224 return docket, changed, data |
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225 |
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226 def update_nodemap_data(self, docket, nm_data): |
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227 """provide full block of persisted binary data for a nodemap |
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228 |
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229 The data are expected to come from disk. See `nodemap_data_all` for a |
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230 produceur of such data.""" |
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231 if nm_data is not None: |
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232 self._nm_root, self._nm_max_idx = nodemaputil.parse_data(nm_data) |
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233 if self._nm_root: |
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234 self._nm_docket = docket |
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235 else: |
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236 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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237 |
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238 |
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239 class InlinedIndexObject(BaseIndexObject): |
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240 def __init__(self, data, inline=0): |
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241 self._data = data |
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242 self._lgt = self._inline_scan(None) |
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243 self._inline_scan(self._lgt) |
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244 self._extra = [] |
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245 |
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246 def _inline_scan(self, lgt): |
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247 off = 0 |
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248 if lgt is not None: |
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249 self._offsets = [0] * lgt |
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250 count = 0 |
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251 while off <= len(self._data) - self.entry_size: |
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252 start = off + self.big_int_size |
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253 (s,) = struct.unpack( |
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254 b'>i', |
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255 self._data[start : start + self.int_size], |
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256 ) |
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257 if lgt is not None: |
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258 self._offsets[count] = off |
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259 count += 1 |
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260 off += self.entry_size + s |
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261 if off != len(self._data): |
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262 raise ValueError(b"corrupted data") |
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263 return count |
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264 |
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265 def __delitem__(self, i): |
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266 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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267 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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268 i = i.start |
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269 self._check_index(i) |
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270 self._stripnodes(i) |
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271 if i < self._lgt: |
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272 self._offsets = self._offsets[:i] |
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273 self._lgt = i |
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274 self._extra = [] |
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275 else: |
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276 self._extra = self._extra[: i - self._lgt] |
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277 |
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278 def _calculate_index(self, i): |
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279 return self._offsets[i] |
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280 |
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281 |
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282 def parse_index2(data, inline, revlogv2=False): |
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283 if not inline: |
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284 cls = IndexObject2 if revlogv2 else IndexObject |
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285 return cls(data), None |
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286 cls = InlinedIndexObject2 if revlogv2 else InlinedIndexObject |
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287 return cls(data, inline), (0, data) |
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288 |
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289 |
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290 class Index2Mixin(object): |
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291 index_format = revlog_constants.INDEX_ENTRY_V2 |
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292 |
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293 def replace_sidedata_info( |
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294 self, rev, sidedata_offset, sidedata_length, offset_flags |
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295 ): |
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296 """ |
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297 Replace an existing index entry's sidedata offset and length with new |
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298 ones. |
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299 This cannot be used outside of the context of sidedata rewriting, |
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300 inside the transaction that creates the revision `rev`. |
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301 """ |
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302 if rev < 0: |
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303 raise KeyError |
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304 self._check_index(rev) |
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305 if rev < self._lgt: |
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306 msg = b"cannot rewrite entries outside of this transaction" |
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307 raise KeyError(msg) |
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308 else: |
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309 entry = list(self[rev]) |
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310 entry[0] = offset_flags |
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311 entry[8] = sidedata_offset |
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312 entry[9] = sidedata_length |
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313 entry = tuple(entry) |
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314 new = self._pack_entry(entry) |
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315 self._extra[rev - self._lgt] = new |
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316 |
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317 def _unpack_entry(self, data): |
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318 return self.index_format.unpack(data) + ( |
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319 revlog_constants.COMP_MODE_INLINE, |
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320 ) |
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321 |
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322 def _pack_entry(self, entry): |
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323 return self.index_format.pack(*entry[:10]) |
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324 |
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325 def entry_binary(self, rev): |
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326 """return the raw binary string representing a revision""" |
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327 entry = self[rev] |
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328 return self._pack_entry(entry) |
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329 |
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330 def pack_header(self, header): |
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331 """pack header information as binary""" |
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332 msg = 'version header should go in the docket, not the index: %d' |
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333 msg %= header |
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334 raise error.ProgrammingError(msg) |
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335 |
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336 |
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337 class IndexObject2(Index2Mixin, IndexObject): |
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338 pass |
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339 |
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340 |
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341 class InlinedIndexObject2(Index2Mixin, InlinedIndexObject): |
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342 def _inline_scan(self, lgt): |
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343 sidedata_length_pos = 72 |
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344 off = 0 |
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345 if lgt is not None: |
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346 self._offsets = [0] * lgt |
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347 count = 0 |
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348 while off <= len(self._data) - self.entry_size: |
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349 start = off + self.big_int_size |
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350 (data_size,) = struct.unpack( |
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351 b'>i', |
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352 self._data[start : start + self.int_size], |
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353 ) |
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354 start = off + sidedata_length_pos |
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355 (side_data_size,) = struct.unpack( |
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356 b'>i', self._data[start : start + self.int_size] |
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357 ) |
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358 if lgt is not None: |
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359 self._offsets[count] = off |
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360 count += 1 |
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361 off += self.entry_size + data_size + side_data_size |
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362 if off != len(self._data): |
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363 raise ValueError(b"corrupted data") |
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364 return count |
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365 |
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366 |
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367 def parse_index_devel_nodemap(data, inline): |
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368 """like parse_index2, but alway return a PersistentNodeMapIndexObject""" |
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369 return PersistentNodeMapIndexObject(data), None |
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370 |
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371 |
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372 def parse_dirstate(dmap, copymap, st): |
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373 parents = [st[:20], st[20:40]] |
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374 # dereference fields so they will be local in loop |
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375 format = b">cllll" |
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376 e_size = struct.calcsize(format) |
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377 pos1 = 40 |
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378 l = len(st) |
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379 |
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380 # the inner loop |
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381 while pos1 < l: |
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382 pos2 = pos1 + e_size |
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383 e = _unpack(b">cllll", st[pos1:pos2]) # a literal here is faster |
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384 pos1 = pos2 + e[4] |
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385 f = st[pos2:pos1] |
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386 if b'\0' in f: |
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387 f, c = f.split(b'\0') |
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388 copymap[f] = c |
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389 dmap[f] = e[:4] |
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390 return parents |
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391 |
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392 |
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393 def pack_dirstate(dmap, copymap, pl, now): |
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394 now = int(now) |
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395 cs = stringio() |
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396 write = cs.write |
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397 write(b"".join(pl)) |
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398 for f, e in pycompat.iteritems(dmap): |
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399 if e[0] == b'n' and e[3] == now: |
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400 # The file was last modified "simultaneously" with the current |
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401 # write to dirstate (i.e. within the same second for file- |
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402 # systems with a granularity of 1 sec). This commonly happens |
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403 # for at least a couple of files on 'update'. |
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404 # The user could change the file without changing its size |
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405 # within the same second. Invalidate the file's mtime in |
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406 # dirstate, forcing future 'status' calls to compare the |
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407 # contents of the file if the size is the same. This prevents |
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408 # mistakenly treating such files as clean. |
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409 e = dirstatetuple(e[0], e[1], e[2], -1) |
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410 dmap[f] = e |
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411 |
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412 if f in copymap: |
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413 f = b"%s\0%s" % (f, copymap[f]) |
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414 e = _pack(b">cllll", e[0], e[1], e[2], e[3], len(f)) |
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415 write(e) |
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416 write(f) |
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417 return cs.getvalue() |