Mercurial > hg
annotate mercurial/pure/parsers.py @ 44337:1d2b37def017
nodemap: double check the source docket when doing incremental update
In theory, the index will have the information we expect it to have. However by
security, it seems safer to double check that the incremental data are generated
from the data currently on disk.
Differential Revision: https://phab.mercurial-scm.org/D7890
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 15 Jan 2020 15:50:33 +0100 |
parents | 8374b69aef75 |
children | 7baf5f798ba9 |
rev | line source |
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1 # parsers.py - Python implementation of parsers.c |
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2 # |
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3 # Copyright 2009 Matt Mackall <mpm@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 nullid, nullrev |
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14 from .. import ( |
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15 pycompat, |
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16 util, |
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17 ) |
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18 |
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19 from ..revlogutils import nodemap as nodemaputil |
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20 |
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21 stringio = pycompat.bytesio |
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22 |
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23 |
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24 _pack = struct.pack |
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25 _unpack = struct.unpack |
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26 _compress = zlib.compress |
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27 _decompress = zlib.decompress |
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28 |
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29 # Some code below makes tuples directly because it's more convenient. However, |
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30 # code outside this module should always use dirstatetuple. |
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31 def dirstatetuple(*x): |
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32 # x is a tuple |
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33 return x |
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34 |
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35 |
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36 indexformatng = b">Qiiiiii20s12x" |
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37 indexfirst = struct.calcsize(b'Q') |
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38 sizeint = struct.calcsize(b'i') |
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39 indexsize = struct.calcsize(indexformatng) |
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40 |
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41 |
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42 def gettype(q): |
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43 return int(q & 0xFFFF) |
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44 |
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45 |
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46 def offset_type(offset, type): |
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47 return int(int(offset) << 16 | type) |
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48 |
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49 |
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50 class BaseIndexObject(object): |
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51 @property |
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52 def nodemap(self): |
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53 msg = b"index.nodemap is deprecated, use index.[has_node|rev|get_rev]" |
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54 util.nouideprecwarn(msg, b'5.3', stacklevel=2) |
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55 return self._nodemap |
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56 |
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57 @util.propertycache |
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58 def _nodemap(self): |
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59 nodemap = nodemaputil.NodeMap({nullid: nullrev}) |
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60 for r in range(0, len(self)): |
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61 n = self[r][7] |
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62 nodemap[n] = r |
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63 return nodemap |
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64 |
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65 def has_node(self, node): |
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66 """return True if the node exist in the index""" |
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67 return node in self._nodemap |
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68 |
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69 def rev(self, node): |
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70 """return a revision for a node |
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71 |
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72 If the node is unknown, raise a RevlogError""" |
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73 return self._nodemap[node] |
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74 |
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75 def get_rev(self, node): |
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76 """return a revision for a node |
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77 |
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78 If the node is unknown, return None""" |
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79 return self._nodemap.get(node) |
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80 |
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81 def _stripnodes(self, start): |
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82 if '_nodemap' in vars(self): |
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83 for r in range(start, len(self)): |
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84 n = self[r][7] |
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85 del self._nodemap[n] |
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86 |
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87 def clearcaches(self): |
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88 self.__dict__.pop('_nodemap', None) |
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89 |
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90 def __len__(self): |
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91 return self._lgt + len(self._extra) |
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92 |
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93 def append(self, tup): |
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94 if '_nodemap' in vars(self): |
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95 self._nodemap[tup[7]] = len(self) |
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96 self._extra.append(tup) |
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97 |
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98 def _check_index(self, i): |
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99 if not isinstance(i, int): |
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100 raise TypeError(b"expecting int indexes") |
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101 if i < 0 or i >= len(self): |
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102 raise IndexError |
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103 |
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104 def __getitem__(self, i): |
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105 if i == -1: |
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106 return (0, 0, 0, -1, -1, -1, -1, nullid) |
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107 self._check_index(i) |
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108 if i >= self._lgt: |
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109 return self._extra[i - self._lgt] |
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110 index = self._calculate_index(i) |
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111 r = struct.unpack(indexformatng, self._data[index : index + indexsize]) |
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112 if i == 0: |
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113 e = list(r) |
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114 type = gettype(e[0]) |
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115 e[0] = offset_type(0, type) |
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116 return tuple(e) |
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117 return r |
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118 |
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119 |
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120 class IndexObject(BaseIndexObject): |
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121 def __init__(self, data): |
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122 assert len(data) % indexsize == 0 |
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123 self._data = data |
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124 self._lgt = len(data) // indexsize |
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125 self._extra = [] |
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126 |
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127 def _calculate_index(self, i): |
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128 return i * indexsize |
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130 def __delitem__(self, i): |
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131 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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132 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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133 i = i.start |
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134 self._check_index(i) |
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135 self._stripnodes(i) |
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136 if i < self._lgt: |
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137 self._data = self._data[: i * indexsize] |
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138 self._lgt = i |
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139 self._extra = [] |
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140 else: |
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141 self._extra = self._extra[: i - self._lgt] |
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142 |
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143 |
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144 class PersistentNodeMapIndexObject(IndexObject): |
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145 """a Debug oriented class to test persistent nodemap |
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146 |
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147 We need a simple python object to test API and higher level behavior. See |
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148 the Rust implementation for more serious usage. This should be used only |
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149 through the dedicated `devel.persistent-nodemap` config. |
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150 """ |
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151 |
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152 def nodemap_data_all(self): |
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153 """Return bytes containing a full serialization of a nodemap |
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154 |
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155 The nodemap should be valid for the full set of revisions in the |
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156 index.""" |
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157 return nodemaputil.persistent_data(self) |
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158 |
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159 def nodemap_data_incremental(self): |
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160 """Return bytes containing a incremental update to persistent nodemap |
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161 |
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162 This containst the data for an append-only update of the data provided |
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163 in the last call to `update_nodemap_data`. |
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164 """ |
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165 if self._nm_root is None: |
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166 return None |
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167 docket = self._nm_docket |
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168 changed, data = nodemaputil.update_persistent_data( |
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169 self, self._nm_root, self._nm_max_idx, self._nm_docket.tip_rev |
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170 ) |
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171 |
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172 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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173 return docket, changed, data |
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174 |
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175 def update_nodemap_data(self, docket, nm_data): |
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176 """provide full block of persisted binary data for a nodemap |
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177 |
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178 The data are expected to come from disk. See `nodemap_data_all` for a |
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179 produceur of such data.""" |
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180 if nm_data is not None: |
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181 self._nm_root, self._nm_max_idx = nodemaputil.parse_data(nm_data) |
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182 if self._nm_root: |
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183 self._nm_docket = docket |
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184 else: |
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185 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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186 |
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187 |
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188 class InlinedIndexObject(BaseIndexObject): |
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189 def __init__(self, data, inline=0): |
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190 self._data = data |
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191 self._lgt = self._inline_scan(None) |
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192 self._inline_scan(self._lgt) |
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193 self._extra = [] |
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194 |
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195 def _inline_scan(self, lgt): |
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196 off = 0 |
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197 if lgt is not None: |
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198 self._offsets = [0] * lgt |
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199 count = 0 |
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200 while off <= len(self._data) - indexsize: |
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201 (s,) = struct.unpack( |
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202 b'>i', self._data[off + indexfirst : off + sizeint + indexfirst] |
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203 ) |
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204 if lgt is not None: |
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205 self._offsets[count] = off |
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206 count += 1 |
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207 off += indexsize + s |
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208 if off != len(self._data): |
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209 raise ValueError(b"corrupted data") |
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210 return count |
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211 |
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212 def __delitem__(self, i): |
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213 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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214 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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215 i = i.start |
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216 self._check_index(i) |
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217 self._stripnodes(i) |
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218 if i < self._lgt: |
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219 self._offsets = self._offsets[:i] |
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220 self._lgt = i |
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221 self._extra = [] |
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222 else: |
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223 self._extra = self._extra[: i - self._lgt] |
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224 |
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225 def _calculate_index(self, i): |
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226 return self._offsets[i] |
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227 |
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228 |
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229 def parse_index2(data, inline): |
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230 if not inline: |
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231 return IndexObject(data), None |
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232 return InlinedIndexObject(data, inline), (0, data) |
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233 |
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234 |
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235 def parse_index_devel_nodemap(data, inline): |
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236 """like parse_index2, but alway return a PersistentNodeMapIndexObject |
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237 """ |
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238 return PersistentNodeMapIndexObject(data), None |
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239 |
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240 |
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241 def parse_dirstate(dmap, copymap, st): |
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242 parents = [st[:20], st[20:40]] |
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243 # dereference fields so they will be local in loop |
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244 format = b">cllll" |
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245 e_size = struct.calcsize(format) |
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246 pos1 = 40 |
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247 l = len(st) |
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248 |
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249 # the inner loop |
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250 while pos1 < l: |
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251 pos2 = pos1 + e_size |
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252 e = _unpack(b">cllll", st[pos1:pos2]) # a literal here is faster |
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253 pos1 = pos2 + e[4] |
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254 f = st[pos2:pos1] |
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255 if b'\0' in f: |
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256 f, c = f.split(b'\0') |
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257 copymap[f] = c |
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258 dmap[f] = e[:4] |
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259 return parents |
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260 |
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261 |
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262 def pack_dirstate(dmap, copymap, pl, now): |
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263 now = int(now) |
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264 cs = stringio() |
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265 write = cs.write |
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266 write(b"".join(pl)) |
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267 for f, e in pycompat.iteritems(dmap): |
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268 if e[0] == b'n' and e[3] == now: |
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269 # The file was last modified "simultaneously" with the current |
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270 # write to dirstate (i.e. within the same second for file- |
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271 # systems with a granularity of 1 sec). This commonly happens |
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272 # for at least a couple of files on 'update'. |
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273 # The user could change the file without changing its size |
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274 # within the same second. Invalidate the file's mtime in |
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275 # dirstate, forcing future 'status' calls to compare the |
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276 # contents of the file if the size is the same. This prevents |
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277 # mistakenly treating such files as clean. |
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278 e = dirstatetuple(e[0], e[1], e[2], -1) |
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279 dmap[f] = e |
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280 |
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281 if f in copymap: |
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282 f = b"%s\0%s" % (f, copymap[f]) |
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283 e = _pack(b">cllll", e[0], e[1], e[2], e[3], len(f)) |
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284 write(e) |
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285 write(f) |
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286 return cs.getvalue() |