Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/revlog.py @ 1463:26e73acc0cdf
Fix to handle case of empty list for roots or heads in nodesbetween.
| author | Eric Hopper <hopper@omnifarious.org> |
|---|---|
| date | Mon, 10 Oct 2005 17:20:38 -0700 |
| parents | 106fdec8e1fb |
| children | 0847c45ffee6 |
| rev | line source |
|---|---|
| 1083 | 1 """ |
| 2 revlog.py - storage back-end for mercurial | |
| 3 | |
| 4 This provides efficient delta storage with O(1) retrieve and append | |
| 5 and O(changes) merge between branches | |
| 6 | |
| 7 Copyright 2005 Matt Mackall <mpm@selenic.com> | |
| 8 | |
| 9 This software may be used and distributed according to the terms | |
| 10 of the GNU General Public License, incorporated herein by reference. | |
| 11 """ | |
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12 |
| 1089 | 13 from node import * |
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14 from demandload import demandload |
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15 demandload(globals(), "binascii errno heapq mdiff sha struct zlib") |
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16 |
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17 def hash(text, p1, p2): |
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18 """generate a hash from the given text and its parent hashes |
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19 |
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20 This hash combines both the current file contents and its history |
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21 in a manner that makes it easy to distinguish nodes with the same |
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22 content in the revision graph. |
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23 """ |
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24 l = [p1, p2] |
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25 l.sort() |
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26 s = sha.new(l[0]) |
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27 s.update(l[1]) |
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28 s.update(text) |
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29 return s.digest() |
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30 |
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31 def compress(text): |
| 1083 | 32 """ generate a possibly-compressed representation of text """ |
| 112 | 33 if not text: return text |
| 34 if len(text) < 44: | |
| 35 if text[0] == '\0': return text | |
| 36 return 'u' + text | |
| 37 bin = zlib.compress(text) | |
| 38 if len(bin) > len(text): | |
| 39 if text[0] == '\0': return text | |
| 40 return 'u' + text | |
| 41 return bin | |
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42 |
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43 def decompress(bin): |
| 1083 | 44 """ decompress the given input """ |
| 112 | 45 if not bin: return bin |
| 46 t = bin[0] | |
| 47 if t == '\0': return bin | |
| 48 if t == 'x': return zlib.decompress(bin) | |
| 49 if t == 'u': return bin[1:] | |
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50 raise RevlogError("unknown compression type %s" % t) |
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51 |
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52 indexformat = ">4l20s20s20s" |
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53 |
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54 class lazyparser: |
| 1083 | 55 """ |
| 56 this class avoids the need to parse the entirety of large indices | |
| 57 | |
| 58 By default we parse and load 1000 entries at a time. | |
| 59 | |
| 60 If no position is specified, we load the whole index, and replace | |
| 61 the lazy objects in revlog with the underlying objects for | |
| 62 efficiency in cases where we look at most of the nodes. | |
| 63 """ | |
| 323 | 64 def __init__(self, data, revlog): |
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65 self.data = data |
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66 self.s = struct.calcsize(indexformat) |
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67 self.l = len(data)/self.s |
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68 self.index = [None] * self.l |
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69 self.map = {nullid: -1} |
| 323 | 70 self.all = 0 |
| 71 self.revlog = revlog | |
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72 |
| 323 | 73 def load(self, pos=None): |
| 74 if self.all: return | |
| 75 if pos is not None: | |
| 76 block = pos / 1000 | |
| 77 i = block * 1000 | |
| 78 end = min(self.l, i + 1000) | |
| 79 else: | |
| 80 self.all = 1 | |
| 81 i = 0 | |
| 82 end = self.l | |
| 83 self.revlog.index = self.index | |
| 84 self.revlog.nodemap = self.map | |
| 515 | 85 |
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86 while i < end: |
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87 d = self.data[i * self.s: (i + 1) * self.s] |
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88 e = struct.unpack(indexformat, d) |
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89 self.index[i] = e |
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90 self.map[e[6]] = i |
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91 i += 1 |
| 515 | 92 |
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93 class lazyindex: |
| 1083 | 94 """a lazy version of the index array""" |
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95 def __init__(self, parser): |
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96 self.p = parser |
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97 def __len__(self): |
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98 return len(self.p.index) |
| 115 | 99 def load(self, pos): |
| 100 self.p.load(pos) | |
| 101 return self.p.index[pos] | |
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102 def __getitem__(self, pos): |
| 115 | 103 return self.p.index[pos] or self.load(pos) |
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104 def append(self, e): |
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105 self.p.index.append(e) |
| 515 | 106 |
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107 class lazymap: |
| 1083 | 108 """a lazy version of the node map""" |
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109 def __init__(self, parser): |
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110 self.p = parser |
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111 def load(self, key): |
| 323 | 112 if self.p.all: return |
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113 n = self.p.data.find(key) |
| 1214 | 114 if n < 0: |
| 115 raise KeyError(key) | |
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116 pos = n / self.p.s |
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117 self.p.load(pos) |
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118 def __contains__(self, key): |
| 323 | 119 self.p.load() |
| 120 return key in self.p.map | |
| 97 | 121 def __iter__(self): |
| 469 | 122 yield nullid |
| 97 | 123 for i in xrange(self.p.l): |
| 124 try: | |
| 125 yield self.p.index[i][6] | |
| 126 except: | |
| 127 self.p.load(i) | |
| 128 yield self.p.index[i][6] | |
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129 def __getitem__(self, key): |
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130 try: |
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131 return self.p.map[key] |
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132 except KeyError: |
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133 try: |
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134 self.load(key) |
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135 return self.p.map[key] |
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136 except KeyError: |
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137 raise KeyError("node " + hex(key)) |
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138 def __setitem__(self, key, val): |
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139 self.p.map[key] = val |
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140 |
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141 class RevlogError(Exception): pass |
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142 |
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143 class revlog: |
| 1083 | 144 """ |
| 145 the underlying revision storage object | |
| 146 | |
| 147 A revlog consists of two parts, an index and the revision data. | |
| 148 | |
| 149 The index is a file with a fixed record size containing | |
| 150 information on each revision, includings its nodeid (hash), the | |
| 151 nodeids of its parents, the position and offset of its data within | |
| 152 the data file, and the revision it's based on. Finally, each entry | |
| 153 contains a linkrev entry that can serve as a pointer to external | |
| 154 data. | |
| 155 | |
| 156 The revision data itself is a linear collection of data chunks. | |
| 157 Each chunk represents a revision and is usually represented as a | |
| 158 delta against the previous chunk. To bound lookup time, runs of | |
| 159 deltas are limited to about 2 times the length of the original | |
| 160 version data. This makes retrieval of a version proportional to | |
| 161 its size, or O(1) relative to the number of revisions. | |
| 162 | |
| 163 Both pieces of the revlog are written to in an append-only | |
| 164 fashion, which means we never need to rewrite a file to insert or | |
| 165 remove data, and can use some simple techniques to avoid the need | |
| 166 for locking while reading. | |
| 167 """ | |
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168 def __init__(self, opener, indexfile, datafile): |
| 1083 | 169 """ |
| 170 create a revlog object | |
| 171 | |
| 172 opener is a function that abstracts the file opening operation | |
| 173 and can be used to implement COW semantics or the like. | |
| 174 """ | |
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175 self.indexfile = indexfile |
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176 self.datafile = datafile |
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177 self.opener = opener |
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178 self.cache = None |
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179 |
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180 try: |
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181 i = self.opener(self.indexfile).read() |
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182 except IOError, inst: |
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183 if inst.errno != errno.ENOENT: |
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184 raise |
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185 i = "" |
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186 |
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187 if len(i) > 10000: |
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188 # big index, let's parse it on demand |
| 323 | 189 parser = lazyparser(i, self) |
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190 self.index = lazyindex(parser) |
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191 self.nodemap = lazymap(parser) |
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192 else: |
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193 s = struct.calcsize(indexformat) |
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194 l = len(i) / s |
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195 self.index = [None] * l |
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196 m = [None] * l |
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197 |
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198 n = 0 |
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199 for f in xrange(0, len(i), s): |
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200 # offset, size, base, linkrev, p1, p2, nodeid |
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201 e = struct.unpack(indexformat, i[f:f + s]) |
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202 m[n] = (e[6], n) |
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203 self.index[n] = e |
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204 n += 1 |
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205 |
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206 self.nodemap = dict(m) |
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207 self.nodemap[nullid] = -1 |
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208 |
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209 def tip(self): return self.node(len(self.index) - 1) |
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210 def count(self): return len(self.index) |
| 26 | 211 def node(self, rev): return (rev < 0) and nullid or self.index[rev][6] |
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212 def rev(self, node): |
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213 try: |
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214 return self.nodemap[node] |
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215 except KeyError: |
| 1214 | 216 raise RevlogError('%s: no node %s' % (self.indexfile, hex(node))) |
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217 def linkrev(self, node): return self.index[self.rev(node)][3] |
| 2 | 218 def parents(self, node): |
| 219 if node == nullid: return (nullid, nullid) | |
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220 return self.index[self.rev(node)][4:6] |
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221 |
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222 def start(self, rev): return self.index[rev][0] |
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223 def length(self, rev): return self.index[rev][1] |
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224 def end(self, rev): return self.start(rev) + self.length(rev) |
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225 def base(self, rev): return self.index[rev][2] |
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226 |
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227 def reachable(self, rev, stop=None): |
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228 reachable = {} |
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229 visit = [rev] |
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230 reachable[rev] = 1 |
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231 if stop: |
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232 stopn = self.rev(stop) |
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233 else: |
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234 stopn = 0 |
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235 while visit: |
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236 n = visit.pop(0) |
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237 if n == stop: |
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238 continue |
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239 if n == nullid: |
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240 continue |
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241 for p in self.parents(n): |
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242 if self.rev(p) < stopn: |
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243 continue |
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244 if p not in reachable: |
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245 reachable[p] = 1 |
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246 visit.append(p) |
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247 return reachable |
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248 |
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249 def nodesbetween(self, roots=None, heads=None): |
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250 """Return a tuple containing three elements. Elements 1 and 2 contain |
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251 a final list bases and heads after all the unreachable ones have been |
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252 pruned. Element 0 contains a topologically sorted list of all |
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253 |
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254 nodes that satisfy these constraints: |
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255 1. All nodes must be descended from a node in roots (the nodes on |
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256 roots are considered descended from themselves). |
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257 2. All nodes must also be ancestors of a node in heads (the nodes in |
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258 heads are considered to be their own ancestors). |
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259 |
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260 If roots is unspecified, nullid is assumed as the only root. |
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261 If heads is unspecified, it is taken to be the output of the |
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262 heads method (i.e. a list of all nodes in the repository that |
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263 have no children).""" |
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264 nonodes = ([], [], []) |
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265 if roots is not None: |
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266 roots = list(roots) |
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267 if not roots: |
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268 return nonodes |
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269 lowestrev = min([self.rev(n) for n in roots]) |
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270 else: |
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271 roots = [nullid] # Everybody's a descendent of nullid |
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272 lowestrev = -1 |
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273 if (lowestrev == -1) and (heads is None): |
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274 # We want _all_ the nodes! |
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275 return ([self.node(r) for r in xrange(0, self.count())], |
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276 [nullid], list(self.heads())) |
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277 if heads is None: |
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278 # All nodes are ancestors, so the latest ancestor is the last |
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279 # node. |
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280 highestrev = self.count() - 1 |
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281 # Set ancestors to None to signal that every node is an ancestor. |
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282 ancestors = None |
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283 # Set heads to an empty dictionary for later discovery of heads |
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284 heads = {} |
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285 else: |
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286 heads = list(heads) |
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287 if not heads: |
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288 return nonodes |
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289 ancestors = {} |
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290 # Start at the top and keep marking parents until we're done. |
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291 nodestotag = heads[:] |
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292 # Turn heads into a dictionary so we can remove 'fake' heads. |
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293 # Also, later we will be using it to filter out the heads we can't |
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294 # find from roots. |
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295 heads = dict.fromkeys(heads, 0) |
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296 # Remember where the top was so we can use it as a limit later. |
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297 highestrev = max([self.rev(n) for n in nodestotag]) |
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298 while nodestotag: |
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299 # grab a node to tag |
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300 n = nodestotag.pop() |
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301 # Never tag nullid |
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302 if n == nullid: |
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303 continue |
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304 # A node's revision number represents its place in a |
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305 # topologically sorted list of nodes. |
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306 r = self.rev(n) |
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307 if r >= lowestrev: |
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308 if n not in ancestors: |
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309 # If we are possibly a descendent of one of the roots |
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310 # and we haven't already been marked as an ancestor |
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311 ancestors[n] = 1 # Mark as ancestor |
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312 # Add non-nullid parents to list of nodes to tag. |
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313 nodestotag.extend([p for p in self.parents(n) if |
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314 p != nullid]) |
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315 elif n in heads: # We've seen it before, is it a fake head? |
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316 # So it is, real heads should not be the ancestors of |
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317 # any other heads. |
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318 heads.pop(n) |
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319 if not ancestors: |
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320 return nonodes |
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321 # Now that we have our set of ancestors, we want to remove any |
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322 # roots that are not ancestors. |
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323 |
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324 # If one of the roots was nullid, everything is included anyway. |
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325 if lowestrev > -1: |
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326 # But, since we weren't, let's recompute the lowest rev to not |
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327 # include roots that aren't ancestors. |
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328 |
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329 # Filter out roots that aren't ancestors of heads |
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330 roots = [n for n in roots if n in ancestors] |
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331 # Recompute the lowest revision |
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332 if roots: |
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333 lowestrev = min([self.rev(n) for n in roots]) |
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334 else: |
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335 # No more roots? Return empty list |
|
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336 return nonodes |
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337 else: |
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338 # We are descending from nullid, and don't need to care about |
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339 # any other roots. |
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340 lowestrev = -1 |
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341 roots = [nullid] |
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342 # Transform our roots list into a 'set' (i.e. a dictionary where the |
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343 # values don't matter. |
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344 descendents = dict.fromkeys(roots, 1) |
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345 # Also, keep the original roots so we can filter out roots that aren't |
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346 # 'real' roots (i.e. are descended from other roots). |
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347 roots = descendents.copy() |
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348 # Our topologically sorted list of output nodes. |
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349 orderedout = [] |
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350 # Don't start at nullid since we don't want nullid in our output list, |
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351 # and if nullid shows up in descedents, empty parents will look like |
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352 # they're descendents. |
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353 for r in xrange(max(lowestrev, 0), highestrev + 1): |
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354 n = self.node(r) |
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355 isdescendent = False |
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356 if lowestrev == -1: # Everybody is a descendent of nullid |
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357 isdescendent = True |
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358 elif n in descendents: |
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359 # n is already a descendent |
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360 isdescendent = True |
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361 # This check only needs to be done here because all the roots |
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362 # will start being marked is descendents before the loop. |
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363 if n in roots: |
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364 # If n was a root, check if it's a 'real' root. |
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365 p = tuple(self.parents(n)) |
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366 # If any of its parents are descendents, it's not a root. |
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367 if (p[0] in descendents) or (p[1] in descendents): |
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368 roots.pop(n) |
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369 else: |
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370 p = tuple(self.parents(n)) |
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371 # A node is a descendent if either of its parents are |
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372 # descendents. (We seeded the dependents list with the roots |
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373 # up there, remember?) |
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374 if (p[0] in descendents) or (p[1] in descendents): |
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375 descendents[n] = 1 |
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376 isdescendent = True |
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377 if isdescendent and ((ancestors is None) or (n in ancestors)): |
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378 # Only include nodes that are both descendents and ancestors. |
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379 orderedout.append(n) |
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380 if (ancestors is not None) and (n in heads): |
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381 # We're trying to figure out which heads are reachable |
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382 # from roots. |
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383 # Mark this head as having been reached |
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384 heads[n] = 1 |
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385 elif ancestors is None: |
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386 # Otherwise, we're trying to discover the heads. |
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387 # Assume this is a head because if it isn't, the next step |
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388 # will eventually remove it. |
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389 heads[n] = 1 |
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390 # But, obviously its parents aren't. |
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391 for p in self.parents(n): |
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392 heads.pop(p, None) |
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393 heads = [n for n in heads.iterkeys() if heads[n] != 0] |
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394 roots = roots.keys() |
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395 assert orderedout |
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396 assert roots |
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397 assert heads |
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398 return (orderedout, roots, heads) |
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399 |
| 902 | 400 def heads(self, stop=None): |
| 1083 | 401 """return the list of all nodes that have no children""" |
| 221 | 402 p = {} |
| 403 h = [] | |
| 902 | 404 stoprev = 0 |
| 405 if stop and stop in self.nodemap: | |
| 406 stoprev = self.rev(stop) | |
| 1083 | 407 |
| 243 | 408 for r in range(self.count() - 1, -1, -1): |
| 221 | 409 n = self.node(r) |
| 410 if n not in p: | |
| 411 h.append(n) | |
| 902 | 412 if n == stop: |
| 413 break | |
| 414 if r < stoprev: | |
| 415 break | |
| 221 | 416 for pn in self.parents(n): |
| 417 p[pn] = 1 | |
| 418 return h | |
| 370 | 419 |
| 420 def children(self, node): | |
| 1083 | 421 """find the children of a given node""" |
| 370 | 422 c = [] |
| 423 p = self.rev(node) | |
| 424 for r in range(p + 1, self.count()): | |
| 425 n = self.node(r) | |
| 426 for pn in self.parents(n): | |
|
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427 if pn == node: |
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428 c.append(n) |
| 370 | 429 continue |
| 430 elif pn == nullid: | |
| 431 continue | |
| 432 return c | |
| 515 | 433 |
|
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434 def lookup(self, id): |
| 1083 | 435 """locate a node based on revision number or subset of hex nodeid""" |
|
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436 try: |
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437 rev = int(id) |
| 469 | 438 if str(rev) != id: raise ValueError |
| 439 if rev < 0: rev = self.count() + rev | |
|
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440 if rev < 0 or rev >= self.count(): raise ValueError |
|
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441 return self.node(rev) |
| 469 | 442 except (ValueError, OverflowError): |
|
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443 c = [] |
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444 for n in self.nodemap: |
| 469 | 445 if hex(n).startswith(id): |
|
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446 c.append(n) |
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447 if len(c) > 1: raise KeyError("Ambiguous identifier") |
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448 if len(c) < 1: raise KeyError("No match found") |
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449 return c[0] |
| 515 | 450 |
|
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451 return None |
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452 |
|
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453 def diff(self, a, b): |
| 1083 | 454 """return a delta between two revisions""" |
|
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455 return mdiff.textdiff(a, b) |
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456 |
| 73 | 457 def patches(self, t, pl): |
| 1083 | 458 """apply a list of patches to a string""" |
| 73 | 459 return mdiff.patches(t, pl) |
| 460 | |
|
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461 def delta(self, node): |
| 1083 | 462 """return or calculate a delta between a node and its predecessor""" |
|
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463 r = self.rev(node) |
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464 b = self.base(r) |
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465 if r == b: |
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466 return self.diff(self.revision(self.node(r - 1)), |
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467 self.revision(node)) |
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468 else: |
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469 f = self.opener(self.datafile) |
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470 f.seek(self.start(r)) |
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471 data = f.read(self.length(r)) |
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472 return decompress(data) |
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473 |
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474 def revision(self, node): |
| 1083 | 475 """return an uncompressed revision of a given""" |
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476 if node == nullid: return "" |
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477 if self.cache and self.cache[0] == node: return self.cache[2] |
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478 |
| 1083 | 479 # look up what we need to read |
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480 text = None |
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481 rev = self.rev(node) |
| 117 | 482 start, length, base, link, p1, p2, node = self.index[rev] |
| 483 end = start + length | |
| 484 if base != rev: start = self.start(base) | |
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485 |
| 1083 | 486 # do we have useful data cached? |
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487 if self.cache and self.cache[1] >= base and self.cache[1] < rev: |
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488 base = self.cache[1] |
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489 start = self.start(base + 1) |
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490 text = self.cache[2] |
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491 last = 0 |
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492 |
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493 f = self.opener(self.datafile) |
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494 f.seek(start) |
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495 data = f.read(end - start) |
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496 |
| 651 | 497 if text is None: |
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498 last = self.length(base) |
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499 text = decompress(data[:last]) |
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500 |
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501 bins = [] |
| 64 | 502 for r in xrange(base + 1, rev + 1): |
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503 s = self.length(r) |
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504 bins.append(decompress(data[last:last + s])) |
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505 last = last + s |
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506 |
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507 text = mdiff.patches(text, bins) |
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508 |
| 26 | 509 if node != hash(text, p1, p2): |
| 1214 | 510 raise RevlogError("integrity check failed on %s:%d" |
| 98 | 511 % (self.datafile, rev)) |
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512 |
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513 self.cache = (node, rev, text) |
| 515 | 514 return text |
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515 |
| 644 | 516 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
| 1083 | 517 """add a revision to the log |
| 518 | |
| 519 text - the revision data to add | |
| 520 transaction - the transaction object used for rollback | |
| 521 link - the linkrev data to add | |
| 522 p1, p2 - the parent nodeids of the revision | |
| 523 d - an optional precomputed delta | |
| 524 """ | |
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525 if text is None: text = "" |
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526 if p1 is None: p1 = self.tip() |
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527 if p2 is None: p2 = nullid |
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528 |
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529 node = hash(text, p1, p2) |
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530 |
| 301 | 531 if node in self.nodemap: |
| 532 return node | |
| 533 | |
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534 n = self.count() |
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535 t = n - 1 |
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536 |
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537 if n: |
| 64 | 538 base = self.base(t) |
| 539 start = self.start(base) | |
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540 end = self.end(t) |
| 644 | 541 if not d: |
| 542 prev = self.revision(self.tip()) | |
| 543 d = self.diff(prev, text) | |
| 98 | 544 data = compress(d) |
| 64 | 545 dist = end - start + len(data) |
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546 |
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547 # full versions are inserted when the needed deltas |
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548 # become comparable to the uncompressed text |
| 64 | 549 if not n or dist > len(text) * 2: |
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550 data = compress(text) |
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551 base = n |
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552 else: |
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553 base = self.base(t) |
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554 |
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555 offset = 0 |
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556 if t >= 0: |
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557 offset = self.end(t) |
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558 |
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559 e = (offset, len(data), base, link, p1, p2, node) |
| 515 | 560 |
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561 self.index.append(e) |
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562 self.nodemap[node] = n |
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563 entry = struct.pack(indexformat, *e) |
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564 |
| 26 | 565 transaction.add(self.datafile, e[0]) |
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566 self.opener(self.datafile, "a").write(data) |
| 41 | 567 transaction.add(self.indexfile, n * len(entry)) |
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568 self.opener(self.indexfile, "a").write(entry) |
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569 |
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570 self.cache = (node, n, text) |
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571 return node |
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572 |
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573 def ancestor(self, a, b): |
| 1083 | 574 """calculate the least common ancestor of nodes a and b""" |
| 147 | 575 # calculate the distance of every node from root |
| 576 dist = {nullid: 0} | |
| 577 for i in xrange(self.count()): | |
| 578 n = self.node(i) | |
| 579 p1, p2 = self.parents(n) | |
| 580 dist[n] = max(dist[p1], dist[p2]) + 1 | |
| 515 | 581 |
| 147 | 582 # traverse ancestors in order of decreasing distance from root |
| 583 def ancestors(node): | |
| 584 # we store negative distances because heap returns smallest member | |
| 585 h = [(-dist[node], node)] | |
| 586 seen = {} | |
| 587 earliest = self.count() | |
| 588 while h: | |
| 589 d, n = heapq.heappop(h) | |
| 590 if n not in seen: | |
| 591 seen[n] = 1 | |
| 381 | 592 r = self.rev(n) |
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593 yield (-d, n) |
| 147 | 594 for p in self.parents(n): |
| 595 heapq.heappush(h, (-dist[p], p)) | |
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596 |
|
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597 def generations(node): |
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598 sg, s = None, {} |
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599 for g,n in ancestors(node): |
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600 if g != sg: |
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601 if sg: |
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602 yield sg, s |
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603 sg, s = g, {n:1} |
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604 else: |
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605 s[n] = 1 |
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606 yield sg, s |
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607 |
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608 x = generations(a) |
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609 y = generations(b) |
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610 gx = x.next() |
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611 gy = y.next() |
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612 |
| 147 | 613 # increment each ancestor list until it is closer to root than |
| 614 # the other, or they match | |
| 615 while 1: | |
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616 #print "ancestor gen %s %s" % (gx[0], gy[0]) |
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617 if gx[0] == gy[0]: |
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618 # find the intersection |
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619 i = [ n for n in gx[1] if n in gy[1] ] |
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620 if i: |
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621 return i[0] |
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622 else: |
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623 #print "next" |
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624 gy = y.next() |
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625 gx = x.next() |
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626 elif gx[0] < gy[0]: |
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627 #print "next y" |
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628 gy = y.next() |
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629 else: |
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630 #print "next x" |
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631 gx = x.next() |
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632 |
|
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633 def group(self, nodelist, lookup, infocollect = None): |
| 1083 | 634 """calculate a delta group |
| 46 | 635 |
| 1083 | 636 Given a list of changeset revs, return a set of deltas and |
| 637 metadata corresponding to nodes. the first delta is | |
| 638 parent(nodes[0]) -> nodes[0] the receiver is guaranteed to | |
| 639 have this parent as it has all history before these | |
| 640 changesets. parent is parent[0] | |
| 641 """ | |
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642 revs = [self.rev(n) for n in nodelist] |
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643 needed = dict.fromkeys(revs, 1) |
| 46 | 644 |
| 645 # if we don't have any revisions touched by these changesets, bail | |
| 192 | 646 if not revs: |
| 647 yield struct.pack(">l", 0) | |
| 648 return | |
| 46 | 649 |
| 650 # add the parent of the first rev | |
| 651 p = self.parents(self.node(revs[0]))[0] | |
| 652 revs.insert(0, self.rev(p)) | |
| 653 | |
| 654 # for each delta that isn't contiguous in the log, we need to | |
| 655 # reconstruct the base, reconstruct the result, and then | |
| 656 # calculate the delta. We also need to do this where we've | |
| 657 # stored a full version and not a delta | |
| 658 for i in xrange(0, len(revs) - 1): | |
| 659 a, b = revs[i], revs[i + 1] | |
| 660 if a + 1 != b or self.base(b) == b: | |
| 661 for j in xrange(self.base(a), a + 1): | |
| 662 needed[j] = 1 | |
| 663 for j in xrange(self.base(b), b + 1): | |
| 664 needed[j] = 1 | |
| 665 | |
| 666 # calculate spans to retrieve from datafile | |
| 667 needed = needed.keys() | |
| 668 needed.sort() | |
| 669 spans = [] | |
| 192 | 670 oo = -1 |
| 671 ol = 0 | |
| 46 | 672 for n in needed: |
| 673 if n < 0: continue | |
| 674 o = self.start(n) | |
| 675 l = self.length(n) | |
| 192 | 676 if oo + ol == o: # can we merge with the previous? |
| 677 nl = spans[-1][2] | |
| 678 nl.append((n, l)) | |
| 679 ol += l | |
| 680 spans[-1] = (oo, ol, nl) | |
| 46 | 681 else: |
| 192 | 682 oo = o |
| 683 ol = l | |
| 684 spans.append((oo, ol, [(n, l)])) | |
| 46 | 685 |
| 686 # read spans in, divide up chunks | |
| 687 chunks = {} | |
| 192 | 688 for span in spans: |
| 46 | 689 # we reopen the file for each span to make http happy for now |
| 690 f = self.opener(self.datafile) | |
| 691 f.seek(span[0]) | |
| 692 data = f.read(span[1]) | |
| 693 | |
| 694 # divide up the span | |
| 695 pos = 0 | |
| 696 for r, l in span[2]: | |
| 192 | 697 chunks[r] = decompress(data[pos: pos + l]) |
| 46 | 698 pos += l |
| 699 | |
| 700 # helper to reconstruct intermediate versions | |
| 701 def construct(text, base, rev): | |
| 192 | 702 bins = [chunks[r] for r in xrange(base + 1, rev + 1)] |
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703 return mdiff.patches(text, bins) |
| 46 | 704 |
| 705 # build deltas | |
| 706 deltas = [] | |
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707 for d in xrange(0, len(revs) - 1): |
| 46 | 708 a, b = revs[d], revs[d + 1] |
| 709 n = self.node(b) | |
| 192 | 710 |
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711 if infocollect is not None: |
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712 infocollect(n) |
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713 |
| 192 | 714 # do we need to construct a new delta? |
| 46 | 715 if a + 1 != b or self.base(b) == b: |
| 716 if a >= 0: | |
| 717 base = self.base(a) | |
| 192 | 718 ta = chunks[self.base(a)] |
| 46 | 719 ta = construct(ta, base, a) |
| 720 else: | |
| 721 ta = "" | |
| 515 | 722 |
| 46 | 723 base = self.base(b) |
| 724 if a > base: | |
| 725 base = a | |
| 726 tb = ta | |
| 727 else: | |
| 192 | 728 tb = chunks[self.base(b)] |
| 46 | 729 tb = construct(tb, base, b) |
| 730 d = self.diff(ta, tb) | |
| 731 else: | |
| 192 | 732 d = chunks[b] |
| 46 | 733 |
| 734 p = self.parents(n) | |
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735 meta = n + p[0] + p[1] + lookup(n) |
| 46 | 736 l = struct.pack(">l", len(meta) + len(d) + 4) |
| 192 | 737 yield l |
| 738 yield meta | |
| 739 yield d | |
| 46 | 740 |
| 192 | 741 yield struct.pack(">l", 0) |
| 742 | |
| 1062 | 743 def addgroup(self, revs, linkmapper, transaction, unique=0): |
| 1083 | 744 """ |
| 745 add a delta group | |
| 46 | 746 |
| 1083 | 747 given a set of deltas, add them to the revision log. the |
| 748 first delta is against its parent, which should be in our | |
| 749 log, the rest are against the previous delta. | |
| 750 """ | |
| 751 | |
| 752 #track the base of the current delta log | |
| 46 | 753 r = self.count() |
| 754 t = r - 1 | |
| 192 | 755 node = nullid |
| 515 | 756 |
| 655 | 757 base = prev = -1 |
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758 start = end = measure = 0 |
| 46 | 759 if r: |
| 760 start = self.start(self.base(t)) | |
| 761 end = self.end(t) | |
| 762 measure = self.length(self.base(t)) | |
| 763 base = self.base(t) | |
| 764 prev = self.tip() | |
| 765 | |
| 766 transaction.add(self.datafile, end) | |
| 767 transaction.add(self.indexfile, r * struct.calcsize(indexformat)) | |
| 768 dfh = self.opener(self.datafile, "a") | |
| 769 ifh = self.opener(self.indexfile, "a") | |
| 770 | |
| 771 # loop through our set of deltas | |
| 192 | 772 chain = None |
| 773 for chunk in revs: | |
| 774 node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) | |
| 94 | 775 link = linkmapper(cs) |
| 77 | 776 if node in self.nodemap: |
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777 # this can happen if two branches make the same change |
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778 # if unique: |
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779 # raise RevlogError("already have %s" % hex(node[:4])) |
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780 chain = node |
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781 continue |
| 192 | 782 delta = chunk[80:] |
| 783 | |
| 784 if not chain: | |
| 785 # retrieve the parent revision of the delta chain | |
| 786 chain = p1 | |
| 787 if not chain in self.nodemap: | |
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788 raise RevlogError("unknown base %s" % short(chain[:4])) |
| 46 | 789 |
| 790 # full versions are inserted when the needed deltas become | |
| 791 # comparable to the uncompressed text or when the previous | |
| 792 # version is not the one we have a delta against. We use | |
| 793 # the size of the previous full rev as a proxy for the | |
| 794 # current size. | |
| 795 | |
| 796 if chain == prev: | |
| 797 cdelta = compress(delta) | |
| 798 | |
| 799 if chain != prev or (end - start + len(cdelta)) > measure * 2: | |
| 800 # flush our writes here so we can read it in revision | |
| 801 dfh.flush() | |
| 802 ifh.flush() | |
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803 text = self.revision(chain) |
| 73 | 804 text = self.patches(text, [delta]) |
| 46 | 805 chk = self.addrevision(text, transaction, link, p1, p2) |
| 806 if chk != node: | |
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807 raise RevlogError("consistency error adding group") |
| 46 | 808 measure = len(text) |
| 809 else: | |
| 810 e = (end, len(cdelta), self.base(t), link, p1, p2, node) | |
| 811 self.index.append(e) | |
| 812 self.nodemap[node] = r | |
| 813 dfh.write(cdelta) | |
| 814 ifh.write(struct.pack(indexformat, *e)) | |
| 815 | |
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816 t, r, chain, prev = r, r + 1, node, node |
| 46 | 817 start = self.start(self.base(t)) |
| 818 end = self.end(t) | |
| 819 | |
| 820 dfh.close() | |
| 821 ifh.close() | |
| 822 return node |