Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/revlog.py @ 653:94cdd02792b5
Fix corruption resulting from skipping parts of a revision group
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Fix corruption resulting from skipping parts of a revision group
We were occassionally losing track of what revision a delta applied to
when we skipped over deltas we already had and applying the delta
against the wrong base. This could result in coredumps from mpatch,
consistency errors, or failed verify.
manifest hash: fcf20a8abfd81f08fae2398136b2ed66216b2083
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.0 (GNU/Linux)
iD8DBQFCzu5SywK+sNU5EO8RAi10AJ9cqIfQzOzbcdH36t1LR/rY+UMtHwCeM79p
Dtv+Jh0McLZr6nf4iJyhDgI=
=5o6U
-----END PGP SIGNATURE-----
| author | Matt Mackall <mpm@selenic.com> |
|---|---|
| date | Fri, 08 Jul 2005 13:21:22 -0800 |
| parents | 08b65d66f3e7 |
| children | b3bba126b04a |
| rev | line source |
|---|---|
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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 |
| 208 | 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): |
| 112 | 19 if not text: return text |
| 20 if len(text) < 44: | |
| 21 if text[0] == '\0': return text | |
| 22 return 'u' + text | |
| 23 bin = zlib.compress(text) | |
| 24 if len(bin) > len(text): | |
| 25 if text[0] == '\0': return text | |
| 26 return 'u' + text | |
| 27 return bin | |
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28 |
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29 def decompress(bin): |
| 112 | 30 if not bin: return bin |
| 31 t = bin[0] | |
| 32 if t == '\0': return bin | |
| 33 if t == 'x': return zlib.decompress(bin) | |
| 34 if t == 'u': return bin[1:] | |
| 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() |
| 531 | 40 s = sha.new(l[0]) |
| 41 s.update(l[1]) | |
| 42 s.update(text) | |
| 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: |
| 323 | 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} |
| 323 | 55 self.all = 0 |
| 56 self.revlog = revlog | |
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57 |
| 323 | 58 def load(self, pos=None): |
| 59 if self.all: return | |
| 60 if pos is not None: | |
| 61 block = pos / 1000 | |
| 62 i = block * 1000 | |
| 63 end = min(self.l, i + 1000) | |
| 64 else: | |
| 65 self.all = 1 | |
| 66 i = 0 | |
| 67 end = self.l | |
| 68 self.revlog.index = self.index | |
| 69 self.revlog.nodemap = self.map | |
| 515 | 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 |
| 515 | 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) |
| 115 | 83 def load(self, pos): |
| 84 self.p.load(pos) | |
| 85 return self.p.index[pos] | |
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86 def __getitem__(self, pos): |
| 115 | 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) |
| 515 | 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): |
| 323 | 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): |
| 323 | 101 self.p.load() |
| 102 return key in self.p.map | |
| 97 | 103 def __iter__(self): |
| 469 | 104 yield nullid |
| 97 | 105 for i in xrange(self.p.l): |
| 106 try: | |
| 107 yield self.p.index[i][6] | |
| 108 except: | |
| 109 self.p.load(i) | |
| 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() |
| 73 | 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 |
| 323 | 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) |
| 26 | 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 | 162 def parents(self, node): |
| 163 if node == nullid: return (nullid, nullid) | |
| 164 return self.index[self.nodemap[node]][4:6] | |
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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 | 171 def heads(self): |
| 172 p = {} | |
| 173 h = [] | |
| 243 | 174 for r in range(self.count() - 1, -1, -1): |
| 221 | 175 n = self.node(r) |
| 176 if n not in p: | |
| 177 h.append(n) | |
| 178 for pn in self.parents(n): | |
| 179 p[pn] = 1 | |
| 180 return h | |
| 370 | 181 |
| 182 def children(self, node): | |
| 183 c = [] | |
| 184 p = self.rev(node) | |
| 185 for r in range(p + 1, self.count()): | |
| 186 n = self.node(r) | |
| 187 for pn in self.parents(n): | |
| 188 if pn == p: | |
| 189 c.append(p) | |
| 190 continue | |
| 191 elif pn == nullid: | |
| 192 continue | |
| 193 return c | |
| 515 | 194 |
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195 def lookup(self, id): |
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196 try: |
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197 rev = int(id) |
| 469 | 198 if str(rev) != id: raise ValueError |
| 199 if rev < 0: rev = self.count() + rev | |
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200 if rev < 0 or rev >= self.count(): raise ValueError |
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201 return self.node(rev) |
| 469 | 202 except (ValueError, OverflowError): |
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203 c = [] |
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204 for n in self.nodemap: |
| 469 | 205 if hex(n).startswith(id): |
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206 c.append(n) |
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207 if len(c) > 1: raise KeyError("Ambiguous identifier") |
| 67 | 208 if len(c) < 1: raise KeyError("No match found") |
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209 return c[0] |
| 515 | 210 |
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211 return None |
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212 |
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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 | 216 def patches(self, t, pl): |
| 217 return mdiff.patches(t, pl) | |
| 218 | |
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219 def delta(self, node): |
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220 r = self.rev(node) |
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221 b = self.base(r) |
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222 if r == b: |
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223 return self.diff(self.revision(self.node(r - 1)), |
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224 self.revision(node)) |
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225 else: |
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226 f = self.opener(self.datafile) |
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227 f.seek(self.start(r)) |
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228 data = f.read(self.length(r)) |
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229 return decompress(data) |
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230 |
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231 def revision(self, node): |
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232 if node == nullid: return "" |
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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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236 rev = self.rev(node) |
| 117 | 237 start, length, base, link, p1, p2, node = self.index[rev] |
| 238 end = start + length | |
| 239 if base != rev: start = self.start(base) | |
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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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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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246 |
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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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250 |
| 651 | 251 if text is None: |
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252 last = self.length(base) |
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253 text = decompress(data[:last]) |
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254 |
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255 bins = [] |
| 64 | 256 for r in xrange(base + 1, rev + 1): |
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257 s = self.length(r) |
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258 bins.append(decompress(data[last:last + s])) |
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259 last = last + s |
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260 |
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261 text = mdiff.patches(text, bins) |
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262 |
| 26 | 263 if node != hash(text, p1, p2): |
| 98 | 264 raise IOError("integrity check failed on %s:%d" |
| 265 % (self.datafile, rev)) | |
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266 |
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267 self.cache = (node, rev, text) |
| 515 | 268 return text |
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269 |
| 644 | 270 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
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271 if text is None: text = "" |
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272 if p1 is None: p1 = self.tip() |
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273 if p2 is None: p2 = nullid |
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274 |
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275 node = hash(text, p1, p2) |
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276 |
| 301 | 277 if node in self.nodemap: |
| 278 return node | |
| 279 | |
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280 n = self.count() |
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281 t = n - 1 |
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282 |
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283 if n: |
| 64 | 284 base = self.base(t) |
| 285 start = self.start(base) | |
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286 end = self.end(t) |
| 644 | 287 if not d: |
| 288 prev = self.revision(self.tip()) | |
| 289 d = self.diff(prev, text) | |
| 98 | 290 data = compress(d) |
| 64 | 291 dist = end - start + len(data) |
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292 |
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293 # full versions are inserted when the needed deltas |
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294 # become comparable to the uncompressed text |
| 64 | 295 if not n or dist > len(text) * 2: |
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296 data = compress(text) |
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297 base = n |
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298 else: |
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299 base = self.base(t) |
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300 |
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301 offset = 0 |
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302 if t >= 0: |
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303 offset = self.end(t) |
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304 |
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305 e = (offset, len(data), base, link, p1, p2, node) |
| 515 | 306 |
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307 self.index.append(e) |
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308 self.nodemap[node] = n |
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309 entry = struct.pack(indexformat, *e) |
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310 |
| 26 | 311 transaction.add(self.datafile, e[0]) |
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312 self.opener(self.datafile, "a").write(data) |
| 41 | 313 transaction.add(self.indexfile, n * len(entry)) |
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314 self.opener(self.indexfile, "a").write(entry) |
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315 |
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316 self.cache = (node, n, text) |
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317 return node |
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318 |
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319 def ancestor(self, a, b): |
| 147 | 320 # calculate the distance of every node from root |
| 321 dist = {nullid: 0} | |
| 322 for i in xrange(self.count()): | |
| 323 n = self.node(i) | |
| 324 p1, p2 = self.parents(n) | |
| 325 dist[n] = max(dist[p1], dist[p2]) + 1 | |
| 515 | 326 |
| 147 | 327 # traverse ancestors in order of decreasing distance from root |
| 328 def ancestors(node): | |
| 329 # we store negative distances because heap returns smallest member | |
| 330 h = [(-dist[node], node)] | |
| 331 seen = {} | |
| 332 earliest = self.count() | |
| 333 while h: | |
| 334 d, n = heapq.heappop(h) | |
| 335 if n not in seen: | |
| 336 seen[n] = 1 | |
| 381 | 337 r = self.rev(n) |
| 338 yield (-d, r, n) | |
| 147 | 339 for p in self.parents(n): |
| 340 heapq.heappush(h, (-dist[p], p)) | |
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341 |
| 147 | 342 x = ancestors(a) |
| 343 y = ancestors(b) | |
| 344 lx = x.next() | |
| 345 ly = y.next() | |
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346 |
| 147 | 347 # increment each ancestor list until it is closer to root than |
| 348 # the other, or they match | |
| 349 while 1: | |
| 350 if lx == ly: | |
| 381 | 351 return lx[2] |
| 147 | 352 elif lx < ly: |
| 353 ly = y.next() | |
| 354 elif lx > ly: | |
| 355 lx = x.next() | |
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356 |
| 46 | 357 def group(self, linkmap): |
| 358 # given a list of changeset revs, return a set of deltas and | |
| 94 | 359 # metadata corresponding to nodes. the first delta is |
| 46 | 360 # parent(nodes[0]) -> nodes[0] the receiver is guaranteed to |
| 361 # have this parent as it has all history before these | |
| 362 # changesets. parent is parent[0] | |
| 363 | |
| 364 revs = [] | |
| 365 needed = {} | |
| 366 | |
| 367 # find file nodes/revs that match changeset revs | |
| 368 for i in xrange(0, self.count()): | |
| 369 if self.index[i][3] in linkmap: | |
| 370 revs.append(i) | |
| 371 needed[i] = 1 | |
| 372 | |
| 373 # if we don't have any revisions touched by these changesets, bail | |
| 192 | 374 if not revs: |
| 375 yield struct.pack(">l", 0) | |
| 376 return | |
| 46 | 377 |
| 378 # add the parent of the first rev | |
| 379 p = self.parents(self.node(revs[0]))[0] | |
| 380 revs.insert(0, self.rev(p)) | |
| 381 | |
| 382 # for each delta that isn't contiguous in the log, we need to | |
| 383 # reconstruct the base, reconstruct the result, and then | |
| 384 # calculate the delta. We also need to do this where we've | |
| 385 # stored a full version and not a delta | |
| 386 for i in xrange(0, len(revs) - 1): | |
| 387 a, b = revs[i], revs[i + 1] | |
| 388 if a + 1 != b or self.base(b) == b: | |
| 389 for j in xrange(self.base(a), a + 1): | |
| 390 needed[j] = 1 | |
| 391 for j in xrange(self.base(b), b + 1): | |
| 392 needed[j] = 1 | |
| 393 | |
| 394 # calculate spans to retrieve from datafile | |
| 395 needed = needed.keys() | |
| 396 needed.sort() | |
| 397 spans = [] | |
| 192 | 398 oo = -1 |
| 399 ol = 0 | |
| 46 | 400 for n in needed: |
| 401 if n < 0: continue | |
| 402 o = self.start(n) | |
| 403 l = self.length(n) | |
| 192 | 404 if oo + ol == o: # can we merge with the previous? |
| 405 nl = spans[-1][2] | |
| 406 nl.append((n, l)) | |
| 407 ol += l | |
| 408 spans[-1] = (oo, ol, nl) | |
| 46 | 409 else: |
| 192 | 410 oo = o |
| 411 ol = l | |
| 412 spans.append((oo, ol, [(n, l)])) | |
| 46 | 413 |
| 414 # read spans in, divide up chunks | |
| 415 chunks = {} | |
| 192 | 416 for span in spans: |
| 46 | 417 # we reopen the file for each span to make http happy for now |
| 418 f = self.opener(self.datafile) | |
| 419 f.seek(span[0]) | |
| 420 data = f.read(span[1]) | |
| 421 | |
| 422 # divide up the span | |
| 423 pos = 0 | |
| 424 for r, l in span[2]: | |
| 192 | 425 chunks[r] = decompress(data[pos: pos + l]) |
| 46 | 426 pos += l |
| 427 | |
| 428 # helper to reconstruct intermediate versions | |
| 429 def construct(text, base, rev): | |
| 192 | 430 bins = [chunks[r] for r in xrange(base + 1, rev + 1)] |
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431 return mdiff.patches(text, bins) |
| 46 | 432 |
| 433 # build deltas | |
| 434 deltas = [] | |
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435 for d in xrange(0, len(revs) - 1): |
| 46 | 436 a, b = revs[d], revs[d + 1] |
| 437 n = self.node(b) | |
| 192 | 438 |
| 439 # do we need to construct a new delta? | |
| 46 | 440 if a + 1 != b or self.base(b) == b: |
| 441 if a >= 0: | |
| 442 base = self.base(a) | |
| 192 | 443 ta = chunks[self.base(a)] |
| 46 | 444 ta = construct(ta, base, a) |
| 445 else: | |
| 446 ta = "" | |
| 515 | 447 |
| 46 | 448 base = self.base(b) |
| 449 if a > base: | |
| 450 base = a | |
| 451 tb = ta | |
| 452 else: | |
| 192 | 453 tb = chunks[self.base(b)] |
| 46 | 454 tb = construct(tb, base, b) |
| 455 d = self.diff(ta, tb) | |
| 456 else: | |
| 192 | 457 d = chunks[b] |
| 46 | 458 |
| 459 p = self.parents(n) | |
| 460 meta = n + p[0] + p[1] + linkmap[self.linkrev(n)] | |
| 461 l = struct.pack(">l", len(meta) + len(d) + 4) | |
| 192 | 462 yield l |
| 463 yield meta | |
| 464 yield d | |
| 46 | 465 |
| 192 | 466 yield struct.pack(">l", 0) |
| 467 | |
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468 def addgroup(self, revs, linkmapper, transaction, unique = 0): |
| 46 | 469 # given a set of deltas, add them to the revision log. the |
| 470 # first delta is against its parent, which should be in our | |
| 471 # log, the rest are against the previous delta. | |
| 472 | |
| 473 # track the base of the current delta log | |
| 474 r = self.count() | |
| 475 t = r - 1 | |
| 192 | 476 node = nullid |
| 515 | 477 |
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478 base = -1 |
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479 start = end = measure = 0 |
| 46 | 480 if r: |
| 481 start = self.start(self.base(t)) | |
| 482 end = self.end(t) | |
| 483 measure = self.length(self.base(t)) | |
| 484 base = self.base(t) | |
| 485 prev = self.tip() | |
| 486 | |
| 487 transaction.add(self.datafile, end) | |
| 488 transaction.add(self.indexfile, r * struct.calcsize(indexformat)) | |
| 489 dfh = self.opener(self.datafile, "a") | |
| 490 ifh = self.opener(self.indexfile, "a") | |
| 491 | |
| 492 # loop through our set of deltas | |
| 192 | 493 chain = None |
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494 prev = self.tip() |
| 192 | 495 for chunk in revs: |
| 496 node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) | |
| 94 | 497 link = linkmapper(cs) |
| 77 | 498 if node in self.nodemap: |
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499 # this can happen if two branches make the same change |
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500 if unique: |
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501 raise "already have %s" % hex(node[:4]) |
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502 chain = node |
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503 continue |
| 192 | 504 delta = chunk[80:] |
| 505 | |
| 506 if not chain: | |
| 507 # retrieve the parent revision of the delta chain | |
| 508 chain = p1 | |
| 509 if not chain in self.nodemap: | |
| 510 raise "unknown base %s" % short(chain[:4]) | |
| 46 | 511 |
| 512 # full versions are inserted when the needed deltas become | |
| 513 # comparable to the uncompressed text or when the previous | |
| 514 # version is not the one we have a delta against. We use | |
| 515 # the size of the previous full rev as a proxy for the | |
| 516 # current size. | |
| 517 | |
| 518 if chain == prev: | |
| 519 cdelta = compress(delta) | |
| 520 | |
| 521 if chain != prev or (end - start + len(cdelta)) > measure * 2: | |
| 522 # flush our writes here so we can read it in revision | |
| 523 dfh.flush() | |
| 524 ifh.flush() | |
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525 text = self.revision(chain) |
| 73 | 526 text = self.patches(text, [delta]) |
| 46 | 527 chk = self.addrevision(text, transaction, link, p1, p2) |
| 528 if chk != node: | |
| 529 raise "consistency error adding group" | |
| 530 measure = len(text) | |
| 531 else: | |
| 532 e = (end, len(cdelta), self.base(t), link, p1, p2, node) | |
| 533 self.index.append(e) | |
| 534 self.nodemap[node] = r | |
| 535 dfh.write(cdelta) | |
| 536 ifh.write(struct.pack(indexformat, *e)) | |
| 537 | |
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538 t, r, chain, prev = r, r + 1, node, node |
| 46 | 539 start = self.start(self.base(t)) |
| 540 end = self.end(t) | |
| 541 | |
| 542 dfh.close() | |
| 543 ifh.close() | |
| 544 return node |