Mercurial > hg
annotate mercurial/pure/parsers.py @ 47507:d4c795576aeb
dirstate-entry: turn dirstate tuple into a real object (like in C)
With dirstate V2, the stored information and actual format will change. This mean we need to start an a better abstraction for a dirstate entry that a tuple directly accessed.
By chance, the C code is already doing this and pretend to be a tuple. So it
should be fairly easy. We start with turning the tuple into an object, we will
slowly migrate the dirstate code to no longer use the tuple directly in later
changesets.
Differential Revision: https://phab.mercurial-scm.org/D10949
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Sat, 03 Jul 2021 03:48:35 +0200 |
parents | 084ed6a7c6fd |
children | 67d11b0f659f |
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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 revlogutils, |
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21 util, |
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22 ) |
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23 |
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24 from ..revlogutils import nodemap as nodemaputil |
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25 from ..revlogutils import constants as revlog_constants |
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26 |
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27 stringio = pycompat.bytesio |
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28 |
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29 |
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30 _pack = struct.pack |
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31 _unpack = struct.unpack |
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32 _compress = zlib.compress |
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33 _decompress = zlib.decompress |
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34 |
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35 |
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36 class dirstatetuple(object): |
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37 """represent a dirstate entry |
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38 |
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39 It contains: |
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40 |
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41 - state (one of 'n', 'a', 'r', 'm') |
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42 - mode, |
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43 - size, |
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44 - mtime, |
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45 """ |
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46 |
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47 __slot__ = ('_state', '_mode', '_size', '_mtime') |
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48 |
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49 def __init__(self, state, mode, size, mtime): |
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50 self._state = state |
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51 self._mode = mode |
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52 self._size = size |
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53 self._mtime = mtime |
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54 |
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55 def __getitem__(self, idx): |
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56 if idx == 0 or idx == -4: |
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57 return self._state |
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58 elif idx == 1 or idx == -3: |
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59 return self._mode |
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60 elif idx == 2 or idx == -2: |
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61 return self._size |
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62 elif idx == 3 or idx == -1: |
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63 return self._mtime |
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64 else: |
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65 raise IndexError(idx) |
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66 |
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67 |
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68 def gettype(q): |
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69 return int(q & 0xFFFF) |
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71 |
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72 class BaseIndexObject(object): |
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73 # Can I be passed to an algorithme implemented in Rust ? |
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74 rust_ext_compat = 0 |
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75 # Format of an index entry according to Python's `struct` language |
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76 index_format = revlog_constants.INDEX_ENTRY_V1 |
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77 # Size of a C unsigned long long int, platform independent |
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78 big_int_size = struct.calcsize(b'>Q') |
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79 # Size of a C long int, platform independent |
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80 int_size = struct.calcsize(b'>i') |
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81 # An empty index entry, used as a default value to be overridden, or nullrev |
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82 null_item = ( |
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83 0, |
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84 0, |
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85 0, |
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86 -1, |
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87 -1, |
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88 -1, |
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89 -1, |
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90 sha1nodeconstants.nullid, |
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91 0, |
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92 0, |
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93 revlog_constants.COMP_MODE_INLINE, |
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94 revlog_constants.COMP_MODE_INLINE, |
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95 ) |
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96 |
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97 @util.propertycache |
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98 def entry_size(self): |
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99 return self.index_format.size |
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100 |
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101 @property |
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102 def nodemap(self): |
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103 msg = b"index.nodemap is deprecated, use index.[has_node|rev|get_rev]" |
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104 util.nouideprecwarn(msg, b'5.3', stacklevel=2) |
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105 return self._nodemap |
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106 |
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107 @util.propertycache |
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108 def _nodemap(self): |
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109 nodemap = nodemaputil.NodeMap({sha1nodeconstants.nullid: nullrev}) |
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110 for r in range(0, len(self)): |
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111 n = self[r][7] |
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112 nodemap[n] = r |
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113 return nodemap |
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114 |
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115 def has_node(self, node): |
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116 """return True if the node exist in the index""" |
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117 return node in self._nodemap |
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118 |
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119 def rev(self, node): |
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120 """return a revision for a node |
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121 |
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122 If the node is unknown, raise a RevlogError""" |
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123 return self._nodemap[node] |
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124 |
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125 def get_rev(self, node): |
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126 """return a revision for a node |
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127 |
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128 If the node is unknown, return None""" |
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129 return self._nodemap.get(node) |
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130 |
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131 def _stripnodes(self, start): |
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132 if '_nodemap' in vars(self): |
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133 for r in range(start, len(self)): |
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134 n = self[r][7] |
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135 del self._nodemap[n] |
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136 |
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137 def clearcaches(self): |
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138 self.__dict__.pop('_nodemap', None) |
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139 |
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140 def __len__(self): |
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141 return self._lgt + len(self._extra) |
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142 |
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143 def append(self, tup): |
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144 if '_nodemap' in vars(self): |
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145 self._nodemap[tup[7]] = len(self) |
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146 data = self._pack_entry(len(self), tup) |
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147 self._extra.append(data) |
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148 |
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149 def _pack_entry(self, rev, entry): |
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150 assert entry[8] == 0 |
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151 assert entry[9] == 0 |
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152 return self.index_format.pack(*entry[:8]) |
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153 |
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154 def _check_index(self, i): |
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155 if not isinstance(i, int): |
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156 raise TypeError(b"expecting int indexes") |
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157 if i < 0 or i >= len(self): |
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158 raise IndexError |
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159 |
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160 def __getitem__(self, i): |
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161 if i == -1: |
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162 return self.null_item |
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163 self._check_index(i) |
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164 if i >= self._lgt: |
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165 data = self._extra[i - self._lgt] |
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166 else: |
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167 index = self._calculate_index(i) |
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168 data = self._data[index : index + self.entry_size] |
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169 r = self._unpack_entry(i, data) |
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170 if self._lgt and i == 0: |
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171 offset = revlogutils.offset_type(0, gettype(r[0])) |
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172 r = (offset,) + r[1:] |
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173 return r |
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174 |
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175 def _unpack_entry(self, rev, data): |
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176 r = self.index_format.unpack(data) |
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177 r = r + ( |
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178 0, |
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179 0, |
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180 revlog_constants.COMP_MODE_INLINE, |
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181 revlog_constants.COMP_MODE_INLINE, |
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182 ) |
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183 return r |
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184 |
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185 def pack_header(self, header): |
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186 """pack header information as binary""" |
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187 v_fmt = revlog_constants.INDEX_HEADER |
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188 return v_fmt.pack(header) |
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189 |
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190 def entry_binary(self, rev): |
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191 """return the raw binary string representing a revision""" |
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192 entry = self[rev] |
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193 p = revlog_constants.INDEX_ENTRY_V1.pack(*entry[:8]) |
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194 if rev == 0: |
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195 p = p[revlog_constants.INDEX_HEADER.size :] |
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196 return p |
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197 |
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198 |
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199 class IndexObject(BaseIndexObject): |
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200 def __init__(self, data): |
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201 assert len(data) % self.entry_size == 0, ( |
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202 len(data), |
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203 self.entry_size, |
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204 len(data) % self.entry_size, |
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205 ) |
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206 self._data = data |
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207 self._lgt = len(data) // self.entry_size |
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208 self._extra = [] |
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209 |
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210 def _calculate_index(self, i): |
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211 return i * self.entry_size |
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213 def __delitem__(self, i): |
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214 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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215 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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216 i = i.start |
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217 self._check_index(i) |
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218 self._stripnodes(i) |
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219 if i < self._lgt: |
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220 self._data = self._data[: i * self.entry_size] |
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221 self._lgt = i |
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222 self._extra = [] |
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223 else: |
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224 self._extra = self._extra[: i - self._lgt] |
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225 |
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226 |
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227 class PersistentNodeMapIndexObject(IndexObject): |
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228 """a Debug oriented class to test persistent nodemap |
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229 |
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230 We need a simple python object to test API and higher level behavior. See |
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231 the Rust implementation for more serious usage. This should be used only |
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232 through the dedicated `devel.persistent-nodemap` config. |
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233 """ |
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234 |
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235 def nodemap_data_all(self): |
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236 """Return bytes containing a full serialization of a nodemap |
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237 |
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238 The nodemap should be valid for the full set of revisions in the |
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239 index.""" |
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240 return nodemaputil.persistent_data(self) |
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241 |
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242 def nodemap_data_incremental(self): |
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243 """Return bytes containing a incremental update to persistent nodemap |
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244 |
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245 This containst the data for an append-only update of the data provided |
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246 in the last call to `update_nodemap_data`. |
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247 """ |
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248 if self._nm_root is None: |
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249 return None |
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250 docket = self._nm_docket |
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251 changed, data = nodemaputil.update_persistent_data( |
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252 self, self._nm_root, self._nm_max_idx, self._nm_docket.tip_rev |
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253 ) |
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254 |
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255 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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256 return docket, changed, data |
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257 |
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258 def update_nodemap_data(self, docket, nm_data): |
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259 """provide full block of persisted binary data for a nodemap |
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260 |
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261 The data are expected to come from disk. See `nodemap_data_all` for a |
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262 produceur of such data.""" |
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263 if nm_data is not None: |
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264 self._nm_root, self._nm_max_idx = nodemaputil.parse_data(nm_data) |
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265 if self._nm_root: |
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266 self._nm_docket = docket |
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267 else: |
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268 self._nm_root = self._nm_max_idx = self._nm_docket = None |
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269 |
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270 |
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271 class InlinedIndexObject(BaseIndexObject): |
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272 def __init__(self, data, inline=0): |
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273 self._data = data |
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274 self._lgt = self._inline_scan(None) |
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275 self._inline_scan(self._lgt) |
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276 self._extra = [] |
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277 |
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278 def _inline_scan(self, lgt): |
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279 off = 0 |
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280 if lgt is not None: |
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281 self._offsets = [0] * lgt |
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282 count = 0 |
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283 while off <= len(self._data) - self.entry_size: |
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284 start = off + self.big_int_size |
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285 (s,) = struct.unpack( |
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286 b'>i', |
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287 self._data[start : start + self.int_size], |
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288 ) |
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289 if lgt is not None: |
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290 self._offsets[count] = off |
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291 count += 1 |
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292 off += self.entry_size + s |
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293 if off != len(self._data): |
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294 raise ValueError(b"corrupted data") |
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295 return count |
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296 |
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297 def __delitem__(self, i): |
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298 if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: |
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299 raise ValueError(b"deleting slices only supports a:-1 with step 1") |
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300 i = i.start |
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301 self._check_index(i) |
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302 self._stripnodes(i) |
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303 if i < self._lgt: |
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304 self._offsets = self._offsets[:i] |
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305 self._lgt = i |
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306 self._extra = [] |
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307 else: |
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308 self._extra = self._extra[: i - self._lgt] |
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309 |
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310 def _calculate_index(self, i): |
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311 return self._offsets[i] |
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312 |
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313 |
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314 def parse_index2(data, inline, revlogv2=False): |
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315 if not inline: |
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316 cls = IndexObject2 if revlogv2 else IndexObject |
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317 return cls(data), None |
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318 cls = InlinedIndexObject |
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319 return cls(data, inline), (0, data) |
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320 |
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321 |
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322 def parse_index_cl_v2(data): |
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323 return IndexChangelogV2(data), None |
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324 |
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325 |
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326 class IndexObject2(IndexObject): |
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327 index_format = revlog_constants.INDEX_ENTRY_V2 |
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328 |
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329 def replace_sidedata_info( |
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330 self, |
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331 rev, |
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332 sidedata_offset, |
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333 sidedata_length, |
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334 offset_flags, |
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335 compression_mode, |
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336 ): |
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337 """ |
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338 Replace an existing index entry's sidedata offset and length with new |
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339 ones. |
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340 This cannot be used outside of the context of sidedata rewriting, |
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341 inside the transaction that creates the revision `rev`. |
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342 """ |
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343 if rev < 0: |
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344 raise KeyError |
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345 self._check_index(rev) |
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346 if rev < self._lgt: |
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347 msg = b"cannot rewrite entries outside of this transaction" |
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348 raise KeyError(msg) |
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349 else: |
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350 entry = list(self[rev]) |
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351 entry[0] = offset_flags |
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352 entry[8] = sidedata_offset |
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353 entry[9] = sidedata_length |
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354 entry[11] = compression_mode |
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355 entry = tuple(entry) |
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356 new = self._pack_entry(rev, entry) |
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357 self._extra[rev - self._lgt] = new |
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358 |
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359 def _unpack_entry(self, rev, data): |
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360 data = self.index_format.unpack(data) |
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361 entry = data[:10] |
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362 data_comp = data[10] & 3 |
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363 sidedata_comp = (data[10] & (3 << 2)) >> 2 |
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364 return entry + (data_comp, sidedata_comp) |
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365 |
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366 def _pack_entry(self, rev, entry): |
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367 data = entry[:10] |
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368 data_comp = entry[10] & 3 |
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369 sidedata_comp = (entry[11] & 3) << 2 |
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370 data += (data_comp | sidedata_comp,) |
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371 |
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372 return self.index_format.pack(*data) |
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373 |
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374 def entry_binary(self, rev): |
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375 """return the raw binary string representing a revision""" |
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376 entry = self[rev] |
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377 return self._pack_entry(rev, entry) |
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378 |
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379 def pack_header(self, header): |
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380 """pack header information as binary""" |
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381 msg = 'version header should go in the docket, not the index: %d' |
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382 msg %= header |
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383 raise error.ProgrammingError(msg) |
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384 |
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385 |
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386 class IndexChangelogV2(IndexObject2): |
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387 index_format = revlog_constants.INDEX_ENTRY_CL_V2 |
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388 |
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389 def _unpack_entry(self, rev, data, r=True): |
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390 items = self.index_format.unpack(data) |
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391 entry = items[:3] + (rev, rev) + items[3:8] |
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392 data_comp = items[8] & 3 |
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393 sidedata_comp = (items[8] >> 2) & 3 |
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394 return entry + (data_comp, sidedata_comp) |
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395 |
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396 def _pack_entry(self, rev, entry): |
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397 assert entry[3] == rev, entry[3] |
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398 assert entry[4] == rev, entry[4] |
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399 data = entry[:3] + entry[5:10] |
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400 data_comp = entry[10] & 3 |
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401 sidedata_comp = (entry[11] & 3) << 2 |
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402 data += (data_comp | sidedata_comp,) |
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403 return self.index_format.pack(*data) |
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404 |
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405 |
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406 def parse_index_devel_nodemap(data, inline): |
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407 """like parse_index2, but alway return a PersistentNodeMapIndexObject""" |
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408 return PersistentNodeMapIndexObject(data), None |
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409 |
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410 |
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411 def parse_dirstate(dmap, copymap, st): |
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412 parents = [st[:20], st[20:40]] |
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413 # dereference fields so they will be local in loop |
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414 format = b">cllll" |
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415 e_size = struct.calcsize(format) |
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416 pos1 = 40 |
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417 l = len(st) |
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418 |
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419 # the inner loop |
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420 while pos1 < l: |
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421 pos2 = pos1 + e_size |
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422 e = _unpack(b">cllll", st[pos1:pos2]) # a literal here is faster |
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423 pos1 = pos2 + e[4] |
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424 f = st[pos2:pos1] |
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425 if b'\0' in f: |
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426 f, c = f.split(b'\0') |
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427 copymap[f] = c |
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428 dmap[f] = e[:4] |
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429 return parents |
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430 |
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431 |
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432 def pack_dirstate(dmap, copymap, pl, now): |
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433 now = int(now) |
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434 cs = stringio() |
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435 write = cs.write |
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436 write(b"".join(pl)) |
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437 for f, e in pycompat.iteritems(dmap): |
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438 if e[0] == b'n' and e[3] == now: |
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439 # The file was last modified "simultaneously" with the current |
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440 # write to dirstate (i.e. within the same second for file- |
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441 # systems with a granularity of 1 sec). This commonly happens |
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442 # for at least a couple of files on 'update'. |
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443 # The user could change the file without changing its size |
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444 # within the same second. Invalidate the file's mtime in |
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445 # dirstate, forcing future 'status' calls to compare the |
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446 # contents of the file if the size is the same. This prevents |
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447 # mistakenly treating such files as clean. |
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448 e = dirstatetuple(e[0], e[1], e[2], -1) |
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449 dmap[f] = e |
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450 |
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451 if f in copymap: |
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452 f = b"%s\0%s" % (f, copymap[f]) |
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453 e = _pack(b">cllll", e[0], e[1], e[2], e[3], len(f)) |
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454 write(e) |
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455 write(f) |
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456 return cs.getvalue() |