annotate mercurial/revlog.py @ 453:7a3a3952c431

Clarify doc/README a bit -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Clarify doc/README a bit manifest hash: db94c24344b56655bea5123ff79db75c7fa2d44c -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (GNU/Linux) iD8DBQFCu2cHywK+sNU5EO8RAuh7AKCZu3ZyrLaCvwlUvc8yY49hNOr2FwCfeQ8w Rpnt3GiIZ5PN01SwFt0B5jE= =953M -----END PGP SIGNATURE-----
author mpm@selenic.com
date Thu, 23 Jun 2005 17:51:03 -0800
parents c9d134165392
children e205194ca7ef
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1 # revlog.py - storage back-end for mercurial
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2 #
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3 # This provides efficient delta storage with O(1) retrieve and append
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4 # and O(changes) merge between branches
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5 #
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6 # Copyright 2005 Matt Mackall <mpm@selenic.com>
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7 #
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8 # This software may be used and distributed according to the terms
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9 # of the GNU General Public License, incorporated herein by reference.
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10
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11 import zlib, struct, sha, binascii, heapq
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12 from mercurial import mdiff
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13
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14 def hex(node): return binascii.hexlify(node)
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15 def bin(node): return binascii.unhexlify(node)
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16 def short(node): return hex(node[:6])
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17
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18 def compress(text):
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19 if not text: return text
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20 if len(text) < 44:
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21 if text[0] == '\0': return text
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22 return 'u' + text
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23 bin = zlib.compress(text)
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24 if len(bin) > len(text):
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25 if text[0] == '\0': return text
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26 return 'u' + text
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27 return bin
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28
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29 def decompress(bin):
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30 if not bin: return bin
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31 t = bin[0]
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32 if t == '\0': return bin
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33 if t == 'x': return zlib.decompress(bin)
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34 if t == 'u': return bin[1:]
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35 raise "unknown compression type %s" % t
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36
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37 def hash(text, p1, p2):
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38 l = [p1, p2]
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39 l.sort()
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40 return sha.sha(l[0] + l[1] + text).digest()
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41
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42 nullid = "\0" * 20
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43 indexformat = ">4l20s20s20s"
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44
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45 class lazyparser:
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46 def __init__(self, data, revlog):
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47 self.data = data
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48 self.s = struct.calcsize(indexformat)
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49 self.l = len(data)/self.s
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50 self.index = [None] * self.l
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51 self.map = {nullid: -1}
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52 self.all = 0
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53 self.revlog = revlog
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54
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55 def load(self, pos=None):
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56 if self.all: return
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57 if pos is not None:
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58 block = pos / 1000
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59 i = block * 1000
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60 end = min(self.l, i + 1000)
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61 else:
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62 self.all = 1
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63 i = 0
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64 end = self.l
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65 self.revlog.index = self.index
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66 self.revlog.nodemap = self.map
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67
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68 while i < end:
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69 d = self.data[i * self.s: (i + 1) * self.s]
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70 e = struct.unpack(indexformat, d)
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71 self.index[i] = e
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72 self.map[e[6]] = i
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73 i += 1
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74
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75 class lazyindex:
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76 def __init__(self, parser):
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77 self.p = parser
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78 def __len__(self):
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79 return len(self.p.index)
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80 def load(self, pos):
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81 self.p.load(pos)
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82 return self.p.index[pos]
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83 def __getitem__(self, pos):
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84 return self.p.index[pos] or self.load(pos)
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85 def append(self, e):
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86 self.p.index.append(e)
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87
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88 class lazymap:
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89 def __init__(self, parser):
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90 self.p = parser
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91 def load(self, key):
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92 if self.p.all: return
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93 n = self.p.data.find(key)
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94 if n < 0: raise KeyError("node " + hex(key))
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95 pos = n / self.p.s
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96 self.p.load(pos)
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97 def __contains__(self, key):
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98 self.p.load()
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99 return key in self.p.map
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100 def __iter__(self):
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101 for i in xrange(self.p.l):
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102 try:
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103 yield self.p.index[i][6]
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104 except:
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105 self.p.load(i)
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106 yield self.p.index[i][6]
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107 def __getitem__(self, key):
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108 try:
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109 return self.p.map[key]
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110 except KeyError:
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111 try:
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112 self.load(key)
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113 return self.p.map[key]
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114 except KeyError:
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115 raise KeyError("node " + hex(key))
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116 def __setitem__(self, key, val):
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117 self.p.map[key] = val
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118
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119 class revlog:
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120 def __init__(self, opener, indexfile, datafile):
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121 self.indexfile = indexfile
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122 self.datafile = datafile
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123 self.opener = opener
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124 self.cache = None
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125
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126 try:
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127 i = self.opener(self.indexfile).read()
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128 except IOError:
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129 i = ""
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130
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131 if len(i) > 10000:
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132 # big index, let's parse it on demand
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133 parser = lazyparser(i, self)
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134 self.index = lazyindex(parser)
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135 self.nodemap = lazymap(parser)
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136 else:
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137 s = struct.calcsize(indexformat)
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138 l = len(i) / s
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139 self.index = [None] * l
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140 m = [None] * l
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141
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142 n = 0
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143 for f in xrange(0, len(i), s):
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144 # offset, size, base, linkrev, p1, p2, nodeid
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145 e = struct.unpack(indexformat, i[f:f + s])
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146 m[n] = (e[6], n)
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147 self.index[n] = e
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148 n += 1
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149
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150 self.nodemap = dict(m)
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151 self.nodemap[nullid] = -1
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152
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153
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154 def tip(self): return self.node(len(self.index) - 1)
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155 def count(self): return len(self.index)
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156 def node(self, rev): return (rev < 0) and nullid or self.index[rev][6]
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157 def rev(self, node): return self.nodemap[node]
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diff changeset
158 def linkrev(self, node): return self.index[self.nodemap[node]][3]
2
ecf3fd948051 Handle nullid better for ancestor
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parents: 0
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159 def parents(self, node):
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parents: 0
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160 if node == nullid: return (nullid, nullid)
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parents: 0
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161 return self.index[self.nodemap[node]][4:6]
0
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162
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163 def start(self, rev): return self.index[rev][0]
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164 def length(self, rev): return self.index[rev][1]
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165 def end(self, rev): return self.start(rev) + self.length(rev)
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166 def base(self, rev): return self.index[rev][2]
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167
221
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parents: 208
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168 def heads(self):
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169 p = {}
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170 h = []
243
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171 for r in range(self.count() - 1, -1, -1):
221
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172 n = self.node(r)
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173 if n not in p:
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174 h.append(n)
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175 for pn in self.parents(n):
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176 p[pn] = 1
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177 return h
370
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178
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179 def children(self, node):
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180 c = []
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181 p = self.rev(node)
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parents: 330
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182 for r in range(p + 1, self.count()):
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183 n = self.node(r)
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parents: 330
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184 for pn in self.parents(n):
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parents: 330
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185 if pn == p:
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186 c.append(p)
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187 continue
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parents: 330
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188 elif pn == nullid:
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189 continue
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190 return c
221
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191
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192 def lookup(self, id):
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193 try:
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194 rev = int(id)
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195 if str(rev) != id: raise "mismatch"
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196 return self.node(rev)
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197 except:
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198 c = []
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199 for n in self.nodemap:
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parents: 26
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200 if id in hex(n):
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201 c.append(n)
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parents: 26
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202 if len(c) > 1: raise KeyError("Ambiguous identifier")
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parents: 65
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203 if len(c) < 1: raise KeyError("No match found")
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204 return c[0]
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205
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206 return None
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207
0
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208 def diff(self, a, b):
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209 return mdiff.textdiff(a, b)
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210
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211 def patches(self, t, pl):
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212 return mdiff.patches(t, pl)
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213
119
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214 def delta(self, node):
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215 r = self.rev(node)
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216 b = self.base(r)
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217 if r == b:
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parents: 117
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218 return self.diff(self.revision(self.node(r - 1)),
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parents: 117
diff changeset
219 self.revision(node))
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parents: 117
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220 else:
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221 f = self.opener(self.datafile)
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parents: 117
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222 f.seek(self.start(r))
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parents: 117
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223 data = f.read(self.length(r))
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diff changeset
224 return decompress(data)
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225
0
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226 def revision(self, node):
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227 if node == nullid: return ""
0
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228 if self.cache and self.cache[0] == node: return self.cache[2]
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229
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230 text = None
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231 rev = self.rev(node)
117
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parents: 116
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232 start, length, base, link, p1, p2, node = self.index[rev]
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parents: 116
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233 end = start + length
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234 if base != rev: start = self.start(base)
0
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235
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236 if self.cache and self.cache[1] >= base and self.cache[1] < rev:
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237 base = self.cache[1]
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238 start = self.start(base + 1)
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239 text = self.cache[2]
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240 last = 0
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241
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242 f = self.opener(self.datafile)
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243 f.seek(start)
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244 data = f.read(end - start)
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245
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246 if not text:
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247 last = self.length(base)
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248 text = decompress(data[:last])
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249
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parents: 67
diff changeset
250 bins = []
64
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parents: 46
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251 for r in xrange(base + 1, rev + 1):
0
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252 s = self.length(r)
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253 bins.append(decompress(data[last:last + s]))
0
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254 last = last + s
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255
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parents: 67
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256 text = mdiff.patches(text, bins)
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parents: 67
diff changeset
257
26
9cf83bf9ad38 Simplify integrity checking
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parents: 14
diff changeset
258 if node != hash(text, p1, p2):
98
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parents: 97
diff changeset
259 raise IOError("integrity check failed on %s:%d"
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parents: 97
diff changeset
260 % (self.datafile, rev))
0
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261
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262 self.cache = (node, rev, text)
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263 return text
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parents:
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264
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parents:
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265 def addrevision(self, text, transaction, link, p1=None, p2=None):
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266 if text is None: text = ""
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parents:
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267 if p1 is None: p1 = self.tip()
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268 if p2 is None: p2 = nullid
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269
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270 node = hash(text, p1, p2)
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271
301
5add718d92db revlog: allow duplicates
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parents: 243
diff changeset
272 if node in self.nodemap:
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diff changeset
273 return node
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diff changeset
274
0
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275 n = self.count()
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276 t = n - 1
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277
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diff changeset
278 if n:
64
b3e2ddff0159 Diff in subdirectories from Jake Edge
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diff changeset
279 base = self.base(t)
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diff changeset
280 start = self.start(base)
0
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281 end = self.end(t)
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282 prev = self.revision(self.tip())
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parents: 97
diff changeset
283 d = self.diff(prev, text)
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parents: 97
diff changeset
284 data = compress(d)
64
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diff changeset
285 dist = end - start + len(data)
0
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parents:
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286
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parents:
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287 # full versions are inserted when the needed deltas
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parents:
diff changeset
288 # become comparable to the uncompressed text
64
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parents: 46
diff changeset
289 if not n or dist > len(text) * 2:
0
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diff changeset
290 data = compress(text)
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parents:
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291 base = n
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parents:
diff changeset
292 else:
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293 base = self.base(t)
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parents:
diff changeset
294
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parents:
diff changeset
295 offset = 0
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parents:
diff changeset
296 if t >= 0:
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parents:
diff changeset
297 offset = self.end(t)
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parents:
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298
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parents:
diff changeset
299 e = (offset, len(data), base, link, p1, p2, node)
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parents:
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300
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parents:
diff changeset
301 self.index.append(e)
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parents:
diff changeset
302 self.nodemap[node] = n
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parents:
diff changeset
303 entry = struct.pack(indexformat, *e)
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parents:
diff changeset
304
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9cf83bf9ad38 Simplify integrity checking
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parents: 14
diff changeset
305 transaction.add(self.datafile, e[0])
0
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diff changeset
306 self.opener(self.datafile, "a").write(data)
41
df3f46253878 Fix truncate logic for indices again
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parents: 36
diff changeset
307 transaction.add(self.indexfile, n * len(entry))
0
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parents:
diff changeset
308 self.opener(self.indexfile, "a").write(entry)
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parents:
diff changeset
309
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parents:
diff changeset
310 self.cache = (node, n, text)
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parents:
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311 return node
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parents:
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312
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313 def ancestor(self, a, b):
147
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parents: 126
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314 # calculate the distance of every node from root
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315 dist = {nullid: 0}
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diff changeset
316 for i in xrange(self.count()):
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diff changeset
317 n = self.node(i)
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diff changeset
318 p1, p2 = self.parents(n)
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diff changeset
319 dist[n] = max(dist[p1], dist[p2]) + 1
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parents: 126
diff changeset
320
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parents: 126
diff changeset
321 # traverse ancestors in order of decreasing distance from root
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diff changeset
322 def ancestors(node):
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323 # we store negative distances because heap returns smallest member
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diff changeset
324 h = [(-dist[node], node)]
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parents: 126
diff changeset
325 seen = {}
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parents: 126
diff changeset
326 earliest = self.count()
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parents: 126
diff changeset
327 while h:
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
328 d, n = heapq.heappop(h)
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
329 if n not in seen:
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
330 seen[n] = 1
381
024ee0f8722a Ancestor algorithm fix
mpm@selenic.com
parents: 377
diff changeset
331 r = self.rev(n)
024ee0f8722a Ancestor algorithm fix
mpm@selenic.com
parents: 377
diff changeset
332 yield (-d, r, n)
147
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
333 for p in self.parents(n):
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parents: 126
diff changeset
334 heapq.heappush(h, (-dist[p], p))
45
f2b2d5daec30 Fix recursion depth trouble with ancestor algorithm
mpm@selenic.com
parents: 41
diff changeset
335
147
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
336 x = ancestors(a)
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
337 y = ancestors(b)
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parents: 126
diff changeset
338 lx = x.next()
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parents: 126
diff changeset
339 ly = y.next()
45
f2b2d5daec30 Fix recursion depth trouble with ancestor algorithm
mpm@selenic.com
parents: 41
diff changeset
340
147
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
341 # increment each ancestor list until it is closer to root than
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
342 # the other, or they match
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
343 while 1:
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
344 if lx == ly:
381
024ee0f8722a Ancestor algorithm fix
mpm@selenic.com
parents: 377
diff changeset
345 return lx[2]
147
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parents: 126
diff changeset
346 elif lx < ly:
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parents: 126
diff changeset
347 ly = y.next()
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parents: 126
diff changeset
348 elif lx > ly:
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
349 lx = x.next()
0
9117c6561b0b Add back links from file revisions to changeset revisions
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parents:
diff changeset
350
46
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
351 def group(self, linkmap):
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parents: 45
diff changeset
352 # given a list of changeset revs, return a set of deltas and
94
7daef883134f Refactor merge code
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parents: 86
diff changeset
353 # metadata corresponding to nodes. the first delta is
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
354 # parent(nodes[0]) -> nodes[0] the receiver is guaranteed to
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
355 # have this parent as it has all history before these
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parents: 45
diff changeset
356 # changesets. parent is parent[0]
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
357
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parents: 45
diff changeset
358 revs = []
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parents: 45
diff changeset
359 needed = {}
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parents: 45
diff changeset
360
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parents: 45
diff changeset
361 # find file nodes/revs that match changeset revs
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parents: 45
diff changeset
362 for i in xrange(0, self.count()):
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parents: 45
diff changeset
363 if self.index[i][3] in linkmap:
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parents: 45
diff changeset
364 revs.append(i)
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
365 needed[i] = 1
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
366
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
367 # if we don't have any revisions touched by these changesets, bail
192
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
368 if not revs:
5d8553352d2e Changes to network protocol
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diff changeset
369 yield struct.pack(">l", 0)
5d8553352d2e Changes to network protocol
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diff changeset
370 return
46
93e868fa0db8 Add changegroup support
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diff changeset
371
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parents: 45
diff changeset
372 # add the parent of the first rev
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diff changeset
373 p = self.parents(self.node(revs[0]))[0]
93e868fa0db8 Add changegroup support
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diff changeset
374 revs.insert(0, self.rev(p))
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parents: 45
diff changeset
375
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parents: 45
diff changeset
376 # for each delta that isn't contiguous in the log, we need to
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
377 # reconstruct the base, reconstruct the result, and then
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
378 # calculate the delta. We also need to do this where we've
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
379 # stored a full version and not a delta
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
380 for i in xrange(0, len(revs) - 1):
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
381 a, b = revs[i], revs[i + 1]
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
382 if a + 1 != b or self.base(b) == b:
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
383 for j in xrange(self.base(a), a + 1):
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
384 needed[j] = 1
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
385 for j in xrange(self.base(b), b + 1):
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
386 needed[j] = 1
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
387
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
388 # calculate spans to retrieve from datafile
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parents: 45
diff changeset
389 needed = needed.keys()
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
390 needed.sort()
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
391 spans = []
192
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
392 oo = -1
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
393 ol = 0
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
394 for n in needed:
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parents: 45
diff changeset
395 if n < 0: continue
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
396 o = self.start(n)
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
397 l = self.length(n)
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
398 if oo + ol == o: # can we merge with the previous?
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
399 nl = spans[-1][2]
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
400 nl.append((n, l))
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
401 ol += l
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
402 spans[-1] = (oo, ol, nl)
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
403 else:
192
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
404 oo = o
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
405 ol = l
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
406 spans.append((oo, ol, [(n, l)]))
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
407
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
408 # read spans in, divide up chunks
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
409 chunks = {}
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
410 for span in spans:
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
411 # we reopen the file for each span to make http happy for now
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
412 f = self.opener(self.datafile)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
413 f.seek(span[0])
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
414 data = f.read(span[1])
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
415
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
416 # divide up the span
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
417 pos = 0
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
418 for r, l in span[2]:
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
419 chunks[r] = decompress(data[pos: pos + l])
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
420 pos += l
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
421
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
422 # helper to reconstruct intermediate versions
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
423 def construct(text, base, rev):
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
424 bins = [chunks[r] for r in xrange(base + 1, rev + 1)]
71
47c9a869adee Add mdiff.patches to speed up applying thousands of patches to the manifest
mpm@selenic.com
parents: 67
diff changeset
425 return mdiff.patches(text, bins)
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
426
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
427 # build deltas
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
428 deltas = []
71
47c9a869adee Add mdiff.patches to speed up applying thousands of patches to the manifest
mpm@selenic.com
parents: 67
diff changeset
429 for d in xrange(0, len(revs) - 1):
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
430 a, b = revs[d], revs[d + 1]
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
431 n = self.node(b)
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
432
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
433 # do we need to construct a new delta?
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
434 if a + 1 != b or self.base(b) == b:
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
435 if a >= 0:
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
436 base = self.base(a)
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
437 ta = chunks[self.base(a)]
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
438 ta = construct(ta, base, a)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
439 else:
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
440 ta = ""
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
441
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
442 base = self.base(b)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
443 if a > base:
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
444 base = a
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
445 tb = ta
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
446 else:
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
447 tb = chunks[self.base(b)]
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
448 tb = construct(tb, base, b)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
449 d = self.diff(ta, tb)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
450 else:
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
451 d = chunks[b]
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
452
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
453 p = self.parents(n)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
454 meta = n + p[0] + p[1] + linkmap[self.linkrev(n)]
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
455 l = struct.pack(">l", len(meta) + len(d) + 4)
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
456 yield l
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
457 yield meta
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
458 yield d
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
459
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
460 yield struct.pack(">l", 0)
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
461
224
ccbcc4d76f81 fix bad assumption about uniqueness of file versions
mpm@selenic.com
parents: 221
diff changeset
462 def addgroup(self, revs, linkmapper, transaction, unique = 0):
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
463 # given a set of deltas, add them to the revision log. the
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
464 # first delta is against its parent, which should be in our
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
465 # log, the rest are against the previous delta.
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
466
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
467 # track the base of the current delta log
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
468 r = self.count()
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
469 t = r - 1
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
470 node = nullid
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
471
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
472 base = prev = -1
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
473 start = end = 0
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
474 if r:
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
475 start = self.start(self.base(t))
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
476 end = self.end(t)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
477 measure = self.length(self.base(t))
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
478 base = self.base(t)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
479 prev = self.tip()
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
480
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
481 transaction.add(self.datafile, end)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
482 transaction.add(self.indexfile, r * struct.calcsize(indexformat))
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
483 dfh = self.opener(self.datafile, "a")
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
484 ifh = self.opener(self.indexfile, "a")
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
485
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
486 # loop through our set of deltas
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
487 chain = None
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
488 for chunk in revs:
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
489 node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80])
94
7daef883134f Refactor merge code
mpm@selenic.com
parents: 86
diff changeset
490 link = linkmapper(cs)
77
bed15e766511 Fix bug in lazymap code
mpm@selenic.com
parents: 76
diff changeset
491 if node in self.nodemap:
224
ccbcc4d76f81 fix bad assumption about uniqueness of file versions
mpm@selenic.com
parents: 221
diff changeset
492 # this can happen if two branches make the same change
ccbcc4d76f81 fix bad assumption about uniqueness of file versions
mpm@selenic.com
parents: 221
diff changeset
493 if unique:
ccbcc4d76f81 fix bad assumption about uniqueness of file versions
mpm@selenic.com
parents: 221
diff changeset
494 raise "already have %s" % hex(node[:4])
ccbcc4d76f81 fix bad assumption about uniqueness of file versions
mpm@selenic.com
parents: 221
diff changeset
495 continue
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
496 delta = chunk[80:]
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
497
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
498 if not chain:
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
499 # retrieve the parent revision of the delta chain
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
500 chain = p1
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
501 if not chain in self.nodemap:
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
502 raise "unknown base %s" % short(chain[:4])
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
503
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
504 # full versions are inserted when the needed deltas become
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
505 # comparable to the uncompressed text or when the previous
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
506 # version is not the one we have a delta against. We use
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
507 # the size of the previous full rev as a proxy for the
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
508 # current size.
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509
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510 if chain == prev:
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511 cdelta = compress(delta)
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512
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513 if chain != prev or (end - start + len(cdelta)) > measure * 2:
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514 # flush our writes here so we can read it in revision
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515 dfh.flush()
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516 ifh.flush()
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517 text = self.revision(chain)
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518 text = self.patches(text, [delta])
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519 chk = self.addrevision(text, transaction, link, p1, p2)
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520 if chk != node:
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521 raise "consistency error adding group"
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522 measure = len(text)
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523 else:
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524 e = (end, len(cdelta), self.base(t), link, p1, p2, node)
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525 self.index.append(e)
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526 self.nodemap[node] = r
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527 dfh.write(cdelta)
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528 ifh.write(struct.pack(indexformat, *e))
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529
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530 t, r, chain, prev = r, r + 1, node, node
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531 start = self.start(self.base(t))
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532 end = self.end(t)
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533
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534 dfh.close()
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535 ifh.close()
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536 return node