Mercurial > hg
annotate mercurial/pure/parsers.py @ 47251:6bfa6c2c5f15
revlogv2: preserve the compression mode on disk
The value is still the same and still not treated, but now it exists one disk.
Differential Revision: https://phab.mercurial-scm.org/D10648
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Mon, 03 May 2021 18:41:51 +0200 |
parents | 130c9f7ed914 |
children | 2b69555e4875 |
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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 |
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320 def _pack_entry(self, entry): |
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321 return self.index_format.pack(*entry[:11]) |
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322 |
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323 def entry_binary(self, rev): |
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324 """return the raw binary string representing a revision""" |
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325 entry = self[rev] |
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326 return self._pack_entry(entry) |
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327 |
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328 def pack_header(self, header): |
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329 """pack header information as binary""" |
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330 msg = 'version header should go in the docket, not the index: %d' |
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331 msg %= header |
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332 raise error.ProgrammingError(msg) |
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333 |
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334 |
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335 class IndexObject2(Index2Mixin, IndexObject): |
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336 pass |
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337 |
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338 |
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339 class InlinedIndexObject2(Index2Mixin, InlinedIndexObject): |
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340 def _inline_scan(self, lgt): |
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341 sidedata_length_pos = 72 |
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342 off = 0 |
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343 if lgt is not None: |
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344 self._offsets = [0] * lgt |
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345 count = 0 |
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346 while off <= len(self._data) - self.entry_size: |
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347 start = off + self.big_int_size |
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348 (data_size,) = struct.unpack( |
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349 b'>i', |
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350 self._data[start : start + self.int_size], |
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351 ) |
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352 start = off + sidedata_length_pos |
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353 (side_data_size,) = struct.unpack( |
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354 b'>i', self._data[start : start + self.int_size] |
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355 ) |
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356 if lgt is not None: |
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357 self._offsets[count] = off |
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358 count += 1 |
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359 off += self.entry_size + data_size + side_data_size |
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360 if off != len(self._data): |
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361 raise ValueError(b"corrupted data") |
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362 return count |
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363 |
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364 |
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365 def parse_index_devel_nodemap(data, inline): |
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366 """like parse_index2, but alway return a PersistentNodeMapIndexObject""" |
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367 return PersistentNodeMapIndexObject(data), None |
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368 |
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369 |
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370 def parse_dirstate(dmap, copymap, st): |
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371 parents = [st[:20], st[20:40]] |
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372 # dereference fields so they will be local in loop |
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373 format = b">cllll" |
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374 e_size = struct.calcsize(format) |
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375 pos1 = 40 |
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376 l = len(st) |
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377 |
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378 # the inner loop |
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379 while pos1 < l: |
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380 pos2 = pos1 + e_size |
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381 e = _unpack(b">cllll", st[pos1:pos2]) # a literal here is faster |
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382 pos1 = pos2 + e[4] |
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383 f = st[pos2:pos1] |
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384 if b'\0' in f: |
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385 f, c = f.split(b'\0') |
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386 copymap[f] = c |
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387 dmap[f] = e[:4] |
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388 return parents |
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389 |
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390 |
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391 def pack_dirstate(dmap, copymap, pl, now): |
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392 now = int(now) |
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393 cs = stringio() |
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394 write = cs.write |
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395 write(b"".join(pl)) |
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396 for f, e in pycompat.iteritems(dmap): |
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397 if e[0] == b'n' and e[3] == now: |
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398 # The file was last modified "simultaneously" with the current |
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399 # write to dirstate (i.e. within the same second for file- |
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400 # systems with a granularity of 1 sec). This commonly happens |
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401 # for at least a couple of files on 'update'. |
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402 # The user could change the file without changing its size |
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403 # within the same second. Invalidate the file's mtime in |
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404 # dirstate, forcing future 'status' calls to compare the |
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405 # contents of the file if the size is the same. This prevents |
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406 # mistakenly treating such files as clean. |
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407 e = dirstatetuple(e[0], e[1], e[2], -1) |
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408 dmap[f] = e |
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409 |
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410 if f in copymap: |
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411 f = b"%s\0%s" % (f, copymap[f]) |
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412 e = _pack(b">cllll", e[0], e[1], e[2], e[3], len(f)) |
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413 write(e) |
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414 write(f) |
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415 return cs.getvalue() |