annotate mercurial/revlog.py @ 874:d4cb383e7de7

Merge Chris's changes with mine.
author Bryan O'Sullivan <bos@serpentine.com>
date Fri, 12 Aug 2005 09:58:35 -0800
parents c2e77581bc84 473c030d34a6
children 781266a78fe1
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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 s = sha.new(l[0])
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41 s.update(l[1])
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42 s.update(text)
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43 return s.digest()
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44
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45 nullid = "\0" * 20
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46 indexformat = ">4l20s20s20s"
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47
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48 class lazyparser:
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49 def __init__(self, data, revlog):
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50 self.data = data
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51 self.s = struct.calcsize(indexformat)
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52 self.l = len(data)/self.s
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53 self.index = [None] * self.l
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54 self.map = {nullid: -1}
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55 self.all = 0
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56 self.revlog = revlog
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57
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58 def load(self, pos=None):
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59 if self.all: return
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60 if pos is not None:
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61 block = pos / 1000
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62 i = block * 1000
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63 end = min(self.l, i + 1000)
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64 else:
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65 self.all = 1
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66 i = 0
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67 end = self.l
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68 self.revlog.index = self.index
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69 self.revlog.nodemap = self.map
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70
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71 while i < end:
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72 d = self.data[i * self.s: (i + 1) * self.s]
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73 e = struct.unpack(indexformat, d)
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74 self.index[i] = e
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75 self.map[e[6]] = i
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76 i += 1
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77
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78 class lazyindex:
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79 def __init__(self, parser):
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80 self.p = parser
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81 def __len__(self):
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82 return len(self.p.index)
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83 def load(self, pos):
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84 self.p.load(pos)
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85 return self.p.index[pos]
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86 def __getitem__(self, pos):
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87 return self.p.index[pos] or self.load(pos)
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88 def append(self, e):
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89 self.p.index.append(e)
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90
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91 class lazymap:
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92 def __init__(self, parser):
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93 self.p = parser
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94 def load(self, key):
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95 if self.p.all: return
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96 n = self.p.data.find(key)
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97 if n < 0: raise KeyError("node " + hex(key))
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98 pos = n / self.p.s
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99 self.p.load(pos)
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100 def __contains__(self, key):
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101 self.p.load()
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102 return key in self.p.map
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103 def __iter__(self):
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104 yield nullid
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105 for i in xrange(self.p.l):
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106 try:
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107 yield self.p.index[i][6]
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108 except:
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109 self.p.load(i)
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110 yield self.p.index[i][6]
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111 def __getitem__(self, key):
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112 try:
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113 return self.p.map[key]
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114 except KeyError:
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115 try:
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116 self.load(key)
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117 return self.p.map[key]
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118 except KeyError:
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119 raise KeyError("node " + hex(key))
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120 def __setitem__(self, key, val):
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121 self.p.map[key] = val
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122
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123 class revlog:
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124 def __init__(self, opener, indexfile, datafile):
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125 self.indexfile = indexfile
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126 self.datafile = datafile
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127 self.opener = opener
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128 self.cache = None
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129
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130 try:
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131 i = self.opener(self.indexfile).read()
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132 except IOError:
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133 i = ""
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134
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135 if len(i) > 10000:
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136 # big index, let's parse it on demand
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137 parser = lazyparser(i, self)
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138 self.index = lazyindex(parser)
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139 self.nodemap = lazymap(parser)
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140 else:
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141 s = struct.calcsize(indexformat)
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142 l = len(i) / s
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143 self.index = [None] * l
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144 m = [None] * l
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145
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146 n = 0
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147 for f in xrange(0, len(i), s):
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148 # offset, size, base, linkrev, p1, p2, nodeid
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149 e = struct.unpack(indexformat, i[f:f + s])
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150 m[n] = (e[6], n)
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151 self.index[n] = e
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152 n += 1
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153
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154 self.nodemap = dict(m)
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155 self.nodemap[nullid] = -1
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156
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157 def tip(self): return self.node(len(self.index) - 1)
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158 def count(self): return len(self.index)
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159 def node(self, rev): return (rev < 0) and nullid or self.index[rev][6]
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160 def rev(self, node): return self.nodemap[node]
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161 def linkrev(self, node): return self.index[self.nodemap[node]][3]
2
ecf3fd948051 Handle nullid better for ancestor
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parents: 0
diff changeset
162 def parents(self, node):
ecf3fd948051 Handle nullid better for ancestor
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parents: 0
diff changeset
163 if node == nullid: return (nullid, nullid)
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parents: 0
diff changeset
164 return self.index[self.nodemap[node]][4:6]
0
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165
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166 def start(self, rev): return self.index[rev][0]
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167 def length(self, rev): return self.index[rev][1]
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168 def end(self, rev): return self.start(rev) + self.length(rev)
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169 def base(self, rev): return self.index[rev][2]
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170
221
2bfe525ef6ca Beginning of multi-head support
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parents: 208
diff changeset
171 def heads(self):
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parents: 208
diff changeset
172 p = {}
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mpm@selenic.com
parents: 208
diff changeset
173 h = []
243
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mpm@selenic.com
parents: 241
diff changeset
174 for r in range(self.count() - 1, -1, -1):
221
2bfe525ef6ca Beginning of multi-head support
mpm@selenic.com
parents: 208
diff changeset
175 n = self.node(r)
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parents: 208
diff changeset
176 if n not in p:
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parents: 208
diff changeset
177 h.append(n)
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parents: 208
diff changeset
178 for pn in self.parents(n):
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parents: 208
diff changeset
179 p[pn] = 1
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parents: 208
diff changeset
180 return h
370
c90385d82aec revlog: add a children function
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parents: 330
diff changeset
181
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parents: 330
diff changeset
182 def children(self, node):
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parents: 330
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183 c = []
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parents: 330
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184 p = self.rev(node)
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parents: 330
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185 for r in range(p + 1, self.count()):
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parents: 330
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186 n = self.node(r)
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parents: 330
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187 for pn in self.parents(n):
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473c030d34a6 Fixed revlog.children.
Tristan Wibberley <tristan@wibberley.org>
parents: 655
diff changeset
188 if pn == node:
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Tristan Wibberley <tristan@wibberley.org>
parents: 655
diff changeset
189 c.append(n)
370
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parents: 330
diff changeset
190 continue
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parents: 330
diff changeset
191 elif pn == nullid:
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parents: 330
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192 continue
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parents: 330
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193 return c
515
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diff changeset
194
36
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parents: 26
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195 def lookup(self, id):
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parents: 26
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196 try:
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197 rev = int(id)
469
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parents: 451
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198 if str(rev) != id: raise ValueError
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parents: 451
diff changeset
199 if rev < 0: rev = self.count() + rev
476
0a338d506268 Really _call_ method revlog.count in revlog.lookup()
Thomas Arendsen Hein <thomas@intevation.de>
parents: 469
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200 if rev < 0 or rev >= self.count(): raise ValueError
36
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parents: 26
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201 return self.node(rev)
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parents: 451
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202 except (ValueError, OverflowError):
36
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parents: 26
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203 c = []
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parents: 26
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204 for n in self.nodemap:
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parents: 451
diff changeset
205 if hex(n).startswith(id):
36
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parents: 26
diff changeset
206 c.append(n)
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parents: 26
diff changeset
207 if len(c) > 1: raise KeyError("Ambiguous identifier")
67
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parents: 65
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208 if len(c) < 1: raise KeyError("No match found")
36
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parents: 26
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209 return c[0]
515
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parents: 484
diff changeset
210
36
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parents: 26
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211 return None
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parents: 26
diff changeset
212
0
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213 def diff(self, a, b):
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214 return mdiff.textdiff(a, b)
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215
73
ee1cbe841e01 Change revlog to use new patch code
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parents: 71
diff changeset
216 def patches(self, t, pl):
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parents: 71
diff changeset
217 return mdiff.patches(t, pl)
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parents: 71
diff changeset
218
119
c7a66f9752a4 Add code to retrieve or construct a revlog delta
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parents: 117
diff changeset
219 def delta(self, node):
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parents: 117
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220 r = self.rev(node)
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parents: 117
diff changeset
221 b = self.base(r)
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parents: 117
diff changeset
222 if r == b:
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parents: 117
diff changeset
223 return self.diff(self.revision(self.node(r - 1)),
c7a66f9752a4 Add code to retrieve or construct a revlog delta
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parents: 117
diff changeset
224 self.revision(node))
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parents: 117
diff changeset
225 else:
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parents: 117
diff changeset
226 f = self.opener(self.datafile)
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parents: 117
diff changeset
227 f.seek(self.start(r))
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parents: 117
diff changeset
228 data = f.read(self.length(r))
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parents: 117
diff changeset
229 return decompress(data)
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parents: 117
diff changeset
230
0
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231 def revision(self, node):
36
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parents: 26
diff changeset
232 if node == nullid: return ""
0
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233 if self.cache and self.cache[0] == node: return self.cache[2]
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234
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235 text = None
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diff changeset
236 rev = self.rev(node)
117
2ac722ad1a9d Make revision code slightly faster
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parents: 116
diff changeset
237 start, length, base, link, p1, p2, node = self.index[rev]
2ac722ad1a9d Make revision code slightly faster
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parents: 116
diff changeset
238 end = start + length
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parents: 116
diff changeset
239 if base != rev: start = self.start(base)
0
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parents:
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240
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241 if self.cache and self.cache[1] >= base and self.cache[1] < rev:
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242 base = self.cache[1]
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parents:
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243 start = self.start(base + 1)
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244 text = self.cache[2]
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245 last = 0
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parents:
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246
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parents:
diff changeset
247 f = self.opener(self.datafile)
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248 f.seek(start)
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249 data = f.read(end - start)
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diff changeset
250
651
08b65d66f3e7 Fix an odd revlog bug
Matt Mackall <mpm@selenic.com>
parents: 644
diff changeset
251 if text is None:
0
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parents:
diff changeset
252 last = self.length(base)
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253 text = decompress(data[:last])
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diff changeset
254
71
47c9a869adee Add mdiff.patches to speed up applying thousands of patches to the manifest
mpm@selenic.com
parents: 67
diff changeset
255 bins = []
64
b3e2ddff0159 Diff in subdirectories from Jake Edge
mpm@selenic.com
parents: 46
diff changeset
256 for r in xrange(base + 1, rev + 1):
0
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parents:
diff changeset
257 s = self.length(r)
71
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parents: 67
diff changeset
258 bins.append(decompress(data[last:last + s]))
0
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parents:
diff changeset
259 last = last + s
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parents:
diff changeset
260
71
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mpm@selenic.com
parents: 67
diff changeset
261 text = mdiff.patches(text, bins)
47c9a869adee Add mdiff.patches to speed up applying thousands of patches to the manifest
mpm@selenic.com
parents: 67
diff changeset
262
26
9cf83bf9ad38 Simplify integrity checking
mpm@selenic.com
parents: 14
diff changeset
263 if node != hash(text, p1, p2):
98
3dde7c87e36d Add paranoia to diff code
mpm@selenic.com
parents: 97
diff changeset
264 raise IOError("integrity check failed on %s:%d"
3dde7c87e36d Add paranoia to diff code
mpm@selenic.com
parents: 97
diff changeset
265 % (self.datafile, rev))
0
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266
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267 self.cache = (node, rev, text)
515
03f27b1381f9 Whitespace cleanups
mpm@selenic.com
parents: 484
diff changeset
268 return text
0
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parents:
diff changeset
269
644
6ebe118280bd Performance enhancements for manifest.add()
mason@suse.com
parents: 547
diff changeset
270 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None):
0
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parents:
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271 if text is None: text = ""
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parents:
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272 if p1 is None: p1 = self.tip()
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parents:
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273 if p2 is None: p2 = nullid
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parents:
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274
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diff changeset
275 node = hash(text, p1, p2)
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diff changeset
276
301
5add718d92db revlog: allow duplicates
mpm@selenic.com
parents: 243
diff changeset
277 if node in self.nodemap:
5add718d92db revlog: allow duplicates
mpm@selenic.com
parents: 243
diff changeset
278 return node
5add718d92db revlog: allow duplicates
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parents: 243
diff changeset
279
0
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parents:
diff changeset
280 n = self.count()
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parents:
diff changeset
281 t = n - 1
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parents:
diff changeset
282
9117c6561b0b Add back links from file revisions to changeset revisions
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parents:
diff changeset
283 if n:
64
b3e2ddff0159 Diff in subdirectories from Jake Edge
mpm@selenic.com
parents: 46
diff changeset
284 base = self.base(t)
b3e2ddff0159 Diff in subdirectories from Jake Edge
mpm@selenic.com
parents: 46
diff changeset
285 start = self.start(base)
0
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parents:
diff changeset
286 end = self.end(t)
644
6ebe118280bd Performance enhancements for manifest.add()
mason@suse.com
parents: 547
diff changeset
287 if not d:
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mason@suse.com
parents: 547
diff changeset
288 prev = self.revision(self.tip())
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mason@suse.com
parents: 547
diff changeset
289 d = self.diff(prev, text)
98
3dde7c87e36d Add paranoia to diff code
mpm@selenic.com
parents: 97
diff changeset
290 data = compress(d)
64
b3e2ddff0159 Diff in subdirectories from Jake Edge
mpm@selenic.com
parents: 46
diff changeset
291 dist = end - start + len(data)
0
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parents:
diff changeset
292
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parents:
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293 # full versions are inserted when the needed deltas
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parents:
diff changeset
294 # become comparable to the uncompressed text
64
b3e2ddff0159 Diff in subdirectories from Jake Edge
mpm@selenic.com
parents: 46
diff changeset
295 if not n or dist > len(text) * 2:
0
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parents:
diff changeset
296 data = compress(text)
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parents:
diff changeset
297 base = n
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parents:
diff changeset
298 else:
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parents:
diff changeset
299 base = self.base(t)
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parents:
diff changeset
300
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parents:
diff changeset
301 offset = 0
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mpm@selenic.com
parents:
diff changeset
302 if t >= 0:
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parents:
diff changeset
303 offset = self.end(t)
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parents:
diff changeset
304
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parents:
diff changeset
305 e = (offset, len(data), base, link, p1, p2, node)
515
03f27b1381f9 Whitespace cleanups
mpm@selenic.com
parents: 484
diff changeset
306
0
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parents:
diff changeset
307 self.index.append(e)
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parents:
diff changeset
308 self.nodemap[node] = n
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parents:
diff changeset
309 entry = struct.pack(indexformat, *e)
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parents:
diff changeset
310
26
9cf83bf9ad38 Simplify integrity checking
mpm@selenic.com
parents: 14
diff changeset
311 transaction.add(self.datafile, e[0])
0
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parents:
diff changeset
312 self.opener(self.datafile, "a").write(data)
41
df3f46253878 Fix truncate logic for indices again
mpm@selenic.com
parents: 36
diff changeset
313 transaction.add(self.indexfile, n * len(entry))
0
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parents:
diff changeset
314 self.opener(self.indexfile, "a").write(entry)
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parents:
diff changeset
315
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parents:
diff changeset
316 self.cache = (node, n, text)
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parents:
diff changeset
317 return node
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parents:
diff changeset
318
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parents:
diff changeset
319 def ancestor(self, a, b):
147
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
320 # calculate the distance of every node from root
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
321 dist = {nullid: 0}
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
322 for i in xrange(self.count()):
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
323 n = self.node(i)
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parents: 126
diff changeset
324 p1, p2 = self.parents(n)
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parents: 126
diff changeset
325 dist[n] = max(dist[p1], dist[p2]) + 1
515
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mpm@selenic.com
parents: 484
diff changeset
326
147
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parents: 126
diff changeset
327 # traverse ancestors in order of decreasing distance from root
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mpm@selenic.com
parents: 126
diff changeset
328 def ancestors(node):
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diff changeset
329 # we store negative distances because heap returns smallest member
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diff changeset
330 h = [(-dist[node], node)]
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diff changeset
331 seen = {}
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diff changeset
332 earliest = self.count()
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parents: 126
diff changeset
333 while h:
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diff changeset
334 d, n = heapq.heappop(h)
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diff changeset
335 if n not in seen:
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diff changeset
336 seen[n] = 1
381
024ee0f8722a Ancestor algorithm fix
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parents: 377
diff changeset
337 r = self.rev(n)
024ee0f8722a Ancestor algorithm fix
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parents: 377
diff changeset
338 yield (-d, r, n)
147
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parents: 126
diff changeset
339 for p in self.parents(n):
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parents: 126
diff changeset
340 heapq.heappush(h, (-dist[p], p))
45
f2b2d5daec30 Fix recursion depth trouble with ancestor algorithm
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parents: 41
diff changeset
341
147
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parents: 126
diff changeset
342 x = ancestors(a)
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diff changeset
343 y = ancestors(b)
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diff changeset
344 lx = x.next()
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diff changeset
345 ly = y.next()
45
f2b2d5daec30 Fix recursion depth trouble with ancestor algorithm
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parents: 41
diff changeset
346
147
b6d8ed7aeba0 A new ancestor algorithm
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parents: 126
diff changeset
347 # increment each ancestor list until it is closer to root than
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parents: 126
diff changeset
348 # the other, or they match
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parents: 126
diff changeset
349 while 1:
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diff changeset
350 if lx == ly:
381
024ee0f8722a Ancestor algorithm fix
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parents: 377
diff changeset
351 return lx[2]
147
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parents: 126
diff changeset
352 elif lx < ly:
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diff changeset
353 ly = y.next()
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parents: 126
diff changeset
354 elif lx > ly:
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parents: 126
diff changeset
355 lx = x.next()
0
9117c6561b0b Add back links from file revisions to changeset revisions
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parents:
diff changeset
356
46
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parents: 45
diff changeset
357 def group(self, linkmap):
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parents: 45
diff changeset
358 # 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
359 # metadata corresponding to nodes. the first delta is
46
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parents: 45
diff changeset
360 # parent(nodes[0]) -> nodes[0] the receiver is guaranteed to
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parents: 45
diff changeset
361 # have this parent as it has all history before these
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parents: 45
diff changeset
362 # changesets. parent is parent[0]
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parents: 45
diff changeset
363
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parents: 45
diff changeset
364 revs = []
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parents: 45
diff changeset
365 needed = {}
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diff changeset
366
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parents: 45
diff changeset
367 # find file nodes/revs that match changeset revs
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parents: 45
diff changeset
368 for i in xrange(0, self.count()):
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parents: 45
diff changeset
369 if self.index[i][3] in linkmap:
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diff changeset
370 revs.append(i)
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parents: 45
diff changeset
371 needed[i] = 1
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diff changeset
372
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
373 # if we don't have any revisions touched by these changesets, bail
192
5d8553352d2e Changes to network protocol
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diff changeset
374 if not revs:
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diff changeset
375 yield struct.pack(">l", 0)
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diff changeset
376 return
46
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
377
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diff changeset
378 # add the parent of the first rev
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diff changeset
379 p = self.parents(self.node(revs[0]))[0]
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diff changeset
380 revs.insert(0, self.rev(p))
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parents: 45
diff changeset
381
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parents: 45
diff changeset
382 # for each delta that isn't contiguous in the log, we need to
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
383 # reconstruct the base, reconstruct the result, and then
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
384 # calculate the delta. We also need to do this where we've
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
385 # stored a full version and not a delta
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
386 for i in xrange(0, len(revs) - 1):
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
387 a, b = revs[i], revs[i + 1]
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
388 if a + 1 != b or self.base(b) == b:
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parents: 45
diff changeset
389 for j in xrange(self.base(a), a + 1):
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parents: 45
diff changeset
390 needed[j] = 1
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
391 for j in xrange(self.base(b), b + 1):
93e868fa0db8 Add changegroup support
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diff changeset
392 needed[j] = 1
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
393
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
394 # calculate spans to retrieve from datafile
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parents: 45
diff changeset
395 needed = needed.keys()
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parents: 45
diff changeset
396 needed.sort()
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
397 spans = []
192
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
398 oo = -1
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
399 ol = 0
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
400 for n in needed:
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
401 if n < 0: continue
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
402 o = self.start(n)
93e868fa0db8 Add changegroup support
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parents: 45
diff changeset
403 l = self.length(n)
192
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
404 if oo + ol == o: # can we merge with the previous?
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
405 nl = spans[-1][2]
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
406 nl.append((n, l))
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
407 ol += l
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
408 spans[-1] = (oo, ol, nl)
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
409 else:
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
410 oo = o
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
411 ol = l
5d8553352d2e Changes to network protocol
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parents: 155
diff changeset
412 spans.append((oo, ol, [(n, l)]))
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
413
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
414 # read spans in, divide up chunks
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
415 chunks = {}
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
416 for span in spans:
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
417 # we reopen the file for each span to make http happy for now
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
418 f = self.opener(self.datafile)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
419 f.seek(span[0])
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
420 data = f.read(span[1])
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
421
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
422 # divide up the span
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
423 pos = 0
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
424 for r, l in span[2]:
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
425 chunks[r] = decompress(data[pos: pos + l])
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
426 pos += l
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
427
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
428 # helper to reconstruct intermediate versions
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
429 def construct(text, base, rev):
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
430 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
431 return mdiff.patches(text, bins)
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
432
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
433 # build deltas
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
434 deltas = []
71
47c9a869adee Add mdiff.patches to speed up applying thousands of patches to the manifest
mpm@selenic.com
parents: 67
diff changeset
435 for d in xrange(0, len(revs) - 1):
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
436 a, b = revs[d], revs[d + 1]
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
437 n = self.node(b)
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
438
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
439 # do we need to construct a new delta?
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
440 if a + 1 != b or self.base(b) == b:
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
441 if a >= 0:
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
442 base = self.base(a)
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
443 ta = chunks[self.base(a)]
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
444 ta = construct(ta, base, a)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
445 else:
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
446 ta = ""
515
03f27b1381f9 Whitespace cleanups
mpm@selenic.com
parents: 484
diff changeset
447
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
448 base = self.base(b)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
449 if a > base:
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
450 base = a
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
451 tb = ta
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
452 else:
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
453 tb = chunks[self.base(b)]
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
454 tb = construct(tb, base, b)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
455 d = self.diff(ta, tb)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
456 else:
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
457 d = chunks[b]
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
458
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
459 p = self.parents(n)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
460 meta = n + p[0] + p[1] + linkmap[self.linkrev(n)]
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
461 l = struct.pack(">l", len(meta) + len(d) + 4)
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
462 yield l
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
463 yield meta
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
464 yield d
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
465
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
466 yield struct.pack(">l", 0)
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
467
224
ccbcc4d76f81 fix bad assumption about uniqueness of file versions
mpm@selenic.com
parents: 221
diff changeset
468 def addgroup(self, revs, linkmapper, transaction, unique = 0):
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
469 # given a set of deltas, add them to the revision log. the
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
470 # first delta is against its parent, which should be in our
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
471 # log, the rest are against the previous delta.
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
472
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
473 # track the base of the current delta log
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
474 r = self.count()
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
475 t = r - 1
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
476 node = nullid
515
03f27b1381f9 Whitespace cleanups
mpm@selenic.com
parents: 484
diff changeset
477
655
b3bba126b04a Fix out of range regression
Matt Mackall <mpm@selenic.com>
parents: 653
diff changeset
478 base = prev = -1
653
94cdd02792b5 Fix corruption resulting from skipping parts of a revision group
Matt Mackall <mpm@selenic.com>
parents: 651
diff changeset
479 start = end = measure = 0
46
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
480 if r:
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
481 start = self.start(self.base(t))
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
482 end = self.end(t)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
483 measure = self.length(self.base(t))
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
484 base = self.base(t)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
485 prev = self.tip()
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
486
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
487 transaction.add(self.datafile, end)
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
488 transaction.add(self.indexfile, r * struct.calcsize(indexformat))
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
489 dfh = self.opener(self.datafile, "a")
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
490 ifh = self.opener(self.indexfile, "a")
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
491
93e868fa0db8 Add changegroup support
mpm@selenic.com
parents: 45
diff changeset
492 # loop through our set of deltas
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
493 chain = None
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
494 for chunk in revs:
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
495 node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80])
94
7daef883134f Refactor merge code
mpm@selenic.com
parents: 86
diff changeset
496 link = linkmapper(cs)
77
bed15e766511 Fix bug in lazymap code
mpm@selenic.com
parents: 76
diff changeset
497 if node in self.nodemap:
224
ccbcc4d76f81 fix bad assumption about uniqueness of file versions
mpm@selenic.com
parents: 221
diff changeset
498 # 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
499 if unique:
ccbcc4d76f81 fix bad assumption about uniqueness of file versions
mpm@selenic.com
parents: 221
diff changeset
500 raise "already have %s" % hex(node[:4])
653
94cdd02792b5 Fix corruption resulting from skipping parts of a revision group
Matt Mackall <mpm@selenic.com>
parents: 651
diff changeset
501 chain = node
224
ccbcc4d76f81 fix bad assumption about uniqueness of file versions
mpm@selenic.com
parents: 221
diff changeset
502 continue
192
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
503 delta = chunk[80:]
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
504
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
505 if not chain:
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
506 # retrieve the parent revision of the delta chain
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
507 chain = p1
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
508 if not chain in self.nodemap:
5d8553352d2e Changes to network protocol
mpm@selenic.com
parents: 155
diff changeset
509 raise "unknown base %s" % short(chain[:4])
46
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510
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511 # full versions are inserted when the needed deltas become
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512 # comparable to the uncompressed text or when the previous
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513 # version is not the one we have a delta against. We use
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514 # the size of the previous full rev as a proxy for the
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515 # current size.
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516
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517 if chain == prev:
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518 cdelta = compress(delta)
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519
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520 if chain != prev or (end - start + len(cdelta)) > measure * 2:
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521 # flush our writes here so we can read it in revision
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522 dfh.flush()
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523 ifh.flush()
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d40cc5aacc31 Fix up a bunch of bugs in the new merge code
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524 text = self.revision(chain)
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525 text = self.patches(text, [delta])
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526 chk = self.addrevision(text, transaction, link, p1, p2)
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527 if chk != node:
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528 raise "consistency error adding group"
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529 measure = len(text)
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530 else:
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531 e = (end, len(cdelta), self.base(t), link, p1, p2, node)
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532 self.index.append(e)
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533 self.nodemap[node] = r
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534 dfh.write(cdelta)
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535 ifh.write(struct.pack(indexformat, *e))
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536
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parents: 64
diff changeset
537 t, r, chain, prev = r, r + 1, node, node
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538 start = self.start(self.base(t))
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539 end = self.end(t)
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540
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541 dfh.close()
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542 ifh.close()
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543 return node