Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/revlog.py @ 1549:fbe4bbd847e5
Always escape repository name in hgweb, very important in notfound.tmpl.
author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Thu, 17 Nov 2005 19:11:13 +0100 |
parents | 7ae0ce7a3dc4 |
children | ccb9b62de892 |
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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 i18n import gettext as _ |
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15 from demandload import demandload |
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16 demandload(globals(), "binascii errno heapq mdiff sha struct zlib") |
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17 |
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18 def hash(text, p1, p2): |
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19 """generate a hash from the given text and its parent hashes |
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20 |
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21 This hash combines both the current file contents and its history |
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22 in a manner that makes it easy to distinguish nodes with the same |
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23 content in the revision graph. |
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24 """ |
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25 l = [p1, p2] |
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26 l.sort() |
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27 s = sha.new(l[0]) |
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28 s.update(l[1]) |
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29 s.update(text) |
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30 return s.digest() |
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31 |
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32 def compress(text): |
1083 | 33 """ generate a possibly-compressed representation of text """ |
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34 if not text: return ("", text) |
112 | 35 if len(text) < 44: |
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36 if text[0] == '\0': return ("", text) |
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37 return ('u', text) |
112 | 38 bin = zlib.compress(text) |
39 if len(bin) > len(text): | |
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40 if text[0] == '\0': return ("", text) |
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41 return ('u', text) |
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42 return ("", bin) |
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43 |
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44 def decompress(bin): |
1083 | 45 """ decompress the given input """ |
112 | 46 if not bin: return bin |
47 t = bin[0] | |
48 if t == '\0': return bin | |
49 if t == 'x': return zlib.decompress(bin) | |
50 if t == 'u': return bin[1:] | |
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51 raise RevlogError(_("unknown compression type %s") % t) |
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52 |
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53 indexformat = ">4l20s20s20s" |
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54 |
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55 class lazyparser: |
1083 | 56 """ |
57 this class avoids the need to parse the entirety of large indices | |
58 | |
59 By default we parse and load 1000 entries at a time. | |
60 | |
61 If no position is specified, we load the whole index, and replace | |
62 the lazy objects in revlog with the underlying objects for | |
63 efficiency in cases where we look at most of the nodes. | |
64 """ | |
323 | 65 def __init__(self, data, revlog): |
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66 self.data = data |
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67 self.s = struct.calcsize(indexformat) |
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68 self.l = len(data)/self.s |
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69 self.index = [None] * self.l |
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70 self.map = {nullid: -1} |
323 | 71 self.all = 0 |
72 self.revlog = revlog | |
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73 |
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74 def trunc(self, pos): |
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75 self.l = pos/self.s |
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76 |
323 | 77 def load(self, pos=None): |
78 if self.all: return | |
79 if pos is not None: | |
80 block = pos / 1000 | |
81 i = block * 1000 | |
82 end = min(self.l, i + 1000) | |
83 else: | |
84 self.all = 1 | |
85 i = 0 | |
86 end = self.l | |
87 self.revlog.index = self.index | |
88 self.revlog.nodemap = self.map | |
515 | 89 |
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90 while i < end: |
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91 d = self.data[i * self.s: (i + 1) * self.s] |
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92 e = struct.unpack(indexformat, d) |
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93 self.index[i] = e |
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94 self.map[e[6]] = i |
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95 i += 1 |
515 | 96 |
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97 class lazyindex: |
1083 | 98 """a lazy version of the index array""" |
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99 def __init__(self, parser): |
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100 self.p = parser |
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101 def __len__(self): |
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102 return len(self.p.index) |
115 | 103 def load(self, pos): |
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104 if pos < 0: |
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105 pos += len(self.p.index) |
115 | 106 self.p.load(pos) |
107 return self.p.index[pos] | |
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108 def __getitem__(self, pos): |
115 | 109 return self.p.index[pos] or self.load(pos) |
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110 def __delitem__(self, pos): |
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111 del self.p.index[pos] |
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112 def append(self, e): |
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113 self.p.index.append(e) |
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114 def trunc(self, pos): |
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115 self.p.trunc(pos) |
515 | 116 |
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117 class lazymap: |
1083 | 118 """a lazy version of the node map""" |
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119 def __init__(self, parser): |
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120 self.p = parser |
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121 def load(self, key): |
323 | 122 if self.p.all: return |
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123 n = self.p.data.find(key) |
1214 | 124 if n < 0: |
125 raise KeyError(key) | |
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126 pos = n / self.p.s |
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127 self.p.load(pos) |
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128 def __contains__(self, key): |
323 | 129 self.p.load() |
130 return key in self.p.map | |
97 | 131 def __iter__(self): |
469 | 132 yield nullid |
97 | 133 for i in xrange(self.p.l): |
134 try: | |
135 yield self.p.index[i][6] | |
136 except: | |
137 self.p.load(i) | |
138 yield self.p.index[i][6] | |
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139 def __getitem__(self, key): |
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140 try: |
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141 return self.p.map[key] |
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142 except KeyError: |
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143 try: |
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144 self.load(key) |
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145 return self.p.map[key] |
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146 except KeyError: |
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147 raise KeyError("node " + hex(key)) |
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148 def __setitem__(self, key, val): |
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149 self.p.map[key] = val |
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150 def __delitem__(self, key): |
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151 del self.p.map[key] |
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152 |
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153 class RevlogError(Exception): pass |
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154 |
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155 class revlog: |
1083 | 156 """ |
157 the underlying revision storage object | |
158 | |
159 A revlog consists of two parts, an index and the revision data. | |
160 | |
161 The index is a file with a fixed record size containing | |
162 information on each revision, includings its nodeid (hash), the | |
163 nodeids of its parents, the position and offset of its data within | |
164 the data file, and the revision it's based on. Finally, each entry | |
165 contains a linkrev entry that can serve as a pointer to external | |
166 data. | |
167 | |
168 The revision data itself is a linear collection of data chunks. | |
169 Each chunk represents a revision and is usually represented as a | |
170 delta against the previous chunk. To bound lookup time, runs of | |
171 deltas are limited to about 2 times the length of the original | |
172 version data. This makes retrieval of a version proportional to | |
173 its size, or O(1) relative to the number of revisions. | |
174 | |
175 Both pieces of the revlog are written to in an append-only | |
176 fashion, which means we never need to rewrite a file to insert or | |
177 remove data, and can use some simple techniques to avoid the need | |
178 for locking while reading. | |
179 """ | |
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180 def __init__(self, opener, indexfile, datafile): |
1083 | 181 """ |
182 create a revlog object | |
183 | |
184 opener is a function that abstracts the file opening operation | |
185 and can be used to implement COW semantics or the like. | |
186 """ | |
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187 self.indexfile = indexfile |
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188 self.datafile = datafile |
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189 self.opener = opener |
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190 self.cache = None |
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191 |
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192 try: |
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193 i = self.opener(self.indexfile).read() |
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194 except IOError, inst: |
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195 if inst.errno != errno.ENOENT: |
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196 raise |
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197 i = "" |
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198 |
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199 if len(i) > 10000: |
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200 # big index, let's parse it on demand |
323 | 201 parser = lazyparser(i, self) |
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202 self.index = lazyindex(parser) |
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203 self.nodemap = lazymap(parser) |
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204 else: |
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205 s = struct.calcsize(indexformat) |
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206 l = len(i) / s |
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207 self.index = [None] * l |
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208 m = [None] * l |
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209 |
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210 n = 0 |
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211 for f in xrange(0, len(i), s): |
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212 # offset, size, base, linkrev, p1, p2, nodeid |
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213 e = struct.unpack(indexformat, i[f:f + s]) |
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214 m[n] = (e[6], n) |
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215 self.index[n] = e |
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216 n += 1 |
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217 |
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218 self.nodemap = dict(m) |
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219 self.nodemap[nullid] = -1 |
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220 |
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221 def tip(self): return self.node(len(self.index) - 1) |
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222 def count(self): return len(self.index) |
26 | 223 def node(self, rev): return (rev < 0) and nullid or self.index[rev][6] |
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224 def rev(self, node): |
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225 try: |
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226 return self.nodemap[node] |
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227 except KeyError: |
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228 raise RevlogError(_('%s: no node %s') % (self.indexfile, hex(node))) |
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229 def linkrev(self, node): return self.index[self.rev(node)][3] |
2 | 230 def parents(self, node): |
231 if node == nullid: return (nullid, nullid) | |
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232 return self.index[self.rev(node)][4:6] |
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233 |
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234 def start(self, rev): return self.index[rev][0] |
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235 def length(self, rev): return self.index[rev][1] |
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236 def end(self, rev): return self.start(rev) + self.length(rev) |
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237 def base(self, rev): return self.index[rev][2] |
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238 |
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239 def reachable(self, rev, stop=None): |
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240 reachable = {} |
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241 visit = [rev] |
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242 reachable[rev] = 1 |
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243 if stop: |
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244 stopn = self.rev(stop) |
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245 else: |
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246 stopn = 0 |
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247 while visit: |
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248 n = visit.pop(0) |
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249 if n == stop: |
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250 continue |
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251 if n == nullid: |
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252 continue |
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253 for p in self.parents(n): |
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254 if self.rev(p) < stopn: |
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255 continue |
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256 if p not in reachable: |
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257 reachable[p] = 1 |
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258 visit.append(p) |
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259 return reachable |
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260 |
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261 def nodesbetween(self, roots=None, heads=None): |
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262 """Return a tuple containing three elements. Elements 1 and 2 contain |
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263 a final list bases and heads after all the unreachable ones have been |
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264 pruned. Element 0 contains a topologically sorted list of all |
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265 |
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266 nodes that satisfy these constraints: |
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267 1. All nodes must be descended from a node in roots (the nodes on |
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268 roots are considered descended from themselves). |
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269 2. All nodes must also be ancestors of a node in heads (the nodes in |
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270 heads are considered to be their own ancestors). |
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271 |
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272 If roots is unspecified, nullid is assumed as the only root. |
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273 If heads is unspecified, it is taken to be the output of the |
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274 heads method (i.e. a list of all nodes in the repository that |
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275 have no children).""" |
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276 nonodes = ([], [], []) |
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277 if roots is not None: |
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278 roots = list(roots) |
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279 if not roots: |
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280 return nonodes |
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281 lowestrev = min([self.rev(n) for n in roots]) |
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282 else: |
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283 roots = [nullid] # Everybody's a descendent of nullid |
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284 lowestrev = -1 |
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285 if (lowestrev == -1) and (heads is None): |
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286 # We want _all_ the nodes! |
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287 return ([self.node(r) for r in xrange(0, self.count())], |
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288 [nullid], list(self.heads())) |
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289 if heads is None: |
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290 # All nodes are ancestors, so the latest ancestor is the last |
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291 # node. |
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292 highestrev = self.count() - 1 |
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293 # Set ancestors to None to signal that every node is an ancestor. |
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294 ancestors = None |
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295 # Set heads to an empty dictionary for later discovery of heads |
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296 heads = {} |
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297 else: |
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298 heads = list(heads) |
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299 if not heads: |
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300 return nonodes |
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301 ancestors = {} |
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302 # Start at the top and keep marking parents until we're done. |
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303 nodestotag = heads[:] |
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304 # Turn heads into a dictionary so we can remove 'fake' heads. |
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305 # Also, later we will be using it to filter out the heads we can't |
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306 # find from roots. |
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307 heads = dict.fromkeys(heads, 0) |
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308 # Remember where the top was so we can use it as a limit later. |
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309 highestrev = max([self.rev(n) for n in nodestotag]) |
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310 while nodestotag: |
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311 # grab a node to tag |
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312 n = nodestotag.pop() |
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313 # Never tag nullid |
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314 if n == nullid: |
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315 continue |
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316 # A node's revision number represents its place in a |
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317 # topologically sorted list of nodes. |
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318 r = self.rev(n) |
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319 if r >= lowestrev: |
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320 if n not in ancestors: |
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321 # If we are possibly a descendent of one of the roots |
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322 # and we haven't already been marked as an ancestor |
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323 ancestors[n] = 1 # Mark as ancestor |
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324 # Add non-nullid parents to list of nodes to tag. |
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325 nodestotag.extend([p for p in self.parents(n) if |
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326 p != nullid]) |
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327 elif n in heads: # We've seen it before, is it a fake head? |
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328 # So it is, real heads should not be the ancestors of |
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329 # any other heads. |
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330 heads.pop(n) |
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331 if not ancestors: |
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332 return nonodes |
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333 # Now that we have our set of ancestors, we want to remove any |
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334 # roots that are not ancestors. |
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335 |
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336 # If one of the roots was nullid, everything is included anyway. |
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337 if lowestrev > -1: |
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338 # But, since we weren't, let's recompute the lowest rev to not |
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339 # include roots that aren't ancestors. |
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340 |
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341 # Filter out roots that aren't ancestors of heads |
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342 roots = [n for n in roots if n in ancestors] |
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343 # Recompute the lowest revision |
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344 if roots: |
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345 lowestrev = min([self.rev(n) for n in roots]) |
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346 else: |
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347 # No more roots? Return empty list |
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348 return nonodes |
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349 else: |
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350 # We are descending from nullid, and don't need to care about |
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351 # any other roots. |
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352 lowestrev = -1 |
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353 roots = [nullid] |
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354 # Transform our roots list into a 'set' (i.e. a dictionary where the |
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355 # values don't matter. |
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356 descendents = dict.fromkeys(roots, 1) |
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357 # Also, keep the original roots so we can filter out roots that aren't |
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358 # 'real' roots (i.e. are descended from other roots). |
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359 roots = descendents.copy() |
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360 # Our topologically sorted list of output nodes. |
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361 orderedout = [] |
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362 # Don't start at nullid since we don't want nullid in our output list, |
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363 # and if nullid shows up in descedents, empty parents will look like |
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364 # they're descendents. |
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365 for r in xrange(max(lowestrev, 0), highestrev + 1): |
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366 n = self.node(r) |
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367 isdescendent = False |
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368 if lowestrev == -1: # Everybody is a descendent of nullid |
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369 isdescendent = True |
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370 elif n in descendents: |
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371 # n is already a descendent |
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372 isdescendent = True |
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373 # This check only needs to be done here because all the roots |
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374 # will start being marked is descendents before the loop. |
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375 if n in roots: |
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376 # If n was a root, check if it's a 'real' root. |
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377 p = tuple(self.parents(n)) |
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378 # If any of its parents are descendents, it's not a root. |
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379 if (p[0] in descendents) or (p[1] in descendents): |
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380 roots.pop(n) |
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381 else: |
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382 p = tuple(self.parents(n)) |
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383 # A node is a descendent if either of its parents are |
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384 # descendents. (We seeded the dependents list with the roots |
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385 # up there, remember?) |
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386 if (p[0] in descendents) or (p[1] in descendents): |
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387 descendents[n] = 1 |
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388 isdescendent = True |
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389 if isdescendent and ((ancestors is None) or (n in ancestors)): |
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390 # Only include nodes that are both descendents and ancestors. |
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391 orderedout.append(n) |
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392 if (ancestors is not None) and (n in heads): |
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393 # We're trying to figure out which heads are reachable |
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394 # from roots. |
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395 # Mark this head as having been reached |
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396 heads[n] = 1 |
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397 elif ancestors is None: |
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398 # Otherwise, we're trying to discover the heads. |
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399 # Assume this is a head because if it isn't, the next step |
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400 # will eventually remove it. |
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401 heads[n] = 1 |
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402 # But, obviously its parents aren't. |
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403 for p in self.parents(n): |
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404 heads.pop(p, None) |
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405 heads = [n for n in heads.iterkeys() if heads[n] != 0] |
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406 roots = roots.keys() |
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407 assert orderedout |
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408 assert roots |
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409 assert heads |
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410 return (orderedout, roots, heads) |
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411 |
902 | 412 def heads(self, stop=None): |
1083 | 413 """return the list of all nodes that have no children""" |
221 | 414 p = {} |
415 h = [] | |
902 | 416 stoprev = 0 |
417 if stop and stop in self.nodemap: | |
418 stoprev = self.rev(stop) | |
1083 | 419 |
243 | 420 for r in range(self.count() - 1, -1, -1): |
221 | 421 n = self.node(r) |
422 if n not in p: | |
423 h.append(n) | |
902 | 424 if n == stop: |
425 break | |
426 if r < stoprev: | |
427 break | |
221 | 428 for pn in self.parents(n): |
429 p[pn] = 1 | |
430 return h | |
370 | 431 |
432 def children(self, node): | |
1083 | 433 """find the children of a given node""" |
370 | 434 c = [] |
435 p = self.rev(node) | |
436 for r in range(p + 1, self.count()): | |
437 n = self.node(r) | |
438 for pn in self.parents(n): | |
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439 if pn == node: |
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440 c.append(n) |
370 | 441 continue |
442 elif pn == nullid: | |
443 continue | |
444 return c | |
515 | 445 |
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446 def lookup(self, id): |
1083 | 447 """locate a node based on revision number or subset of hex nodeid""" |
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448 try: |
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449 rev = int(id) |
469 | 450 if str(rev) != id: raise ValueError |
451 if rev < 0: rev = self.count() + rev | |
476
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452 if rev < 0 or rev >= self.count(): raise ValueError |
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453 return self.node(rev) |
469 | 454 except (ValueError, OverflowError): |
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455 c = [] |
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456 for n in self.nodemap: |
469 | 457 if hex(n).startswith(id): |
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458 c.append(n) |
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459 if len(c) > 1: raise RevlogError(_("Ambiguous identifier")) |
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460 if len(c) < 1: raise RevlogError(_("No match found")) |
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461 return c[0] |
515 | 462 |
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463 return None |
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464 |
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465 def diff(self, a, b): |
1083 | 466 """return a delta between two revisions""" |
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467 return mdiff.textdiff(a, b) |
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468 |
73 | 469 def patches(self, t, pl): |
1083 | 470 """apply a list of patches to a string""" |
73 | 471 return mdiff.patches(t, pl) |
472 | |
119
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473 def delta(self, node): |
1083 | 474 """return or calculate a delta between a node and its predecessor""" |
119
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475 r = self.rev(node) |
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476 b = self.base(r) |
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477 if r == b: |
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478 return self.diff(self.revision(self.node(r - 1)), |
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479 self.revision(node)) |
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480 else: |
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481 f = self.opener(self.datafile) |
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482 f.seek(self.start(r)) |
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483 data = f.read(self.length(r)) |
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484 return decompress(data) |
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485 |
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486 def revision(self, node): |
1083 | 487 """return an uncompressed revision of a given""" |
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488 if node == nullid: return "" |
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489 if self.cache and self.cache[0] == node: return self.cache[2] |
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490 |
1083 | 491 # look up what we need to read |
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492 text = None |
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493 rev = self.rev(node) |
117 | 494 start, length, base, link, p1, p2, node = self.index[rev] |
495 end = start + length | |
496 if base != rev: start = self.start(base) | |
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497 |
1083 | 498 # do we have useful data cached? |
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499 if self.cache and self.cache[1] >= base and self.cache[1] < rev: |
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500 base = self.cache[1] |
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501 start = self.start(base + 1) |
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502 text = self.cache[2] |
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503 last = 0 |
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504 |
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505 f = self.opener(self.datafile) |
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506 f.seek(start) |
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507 data = f.read(end - start) |
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508 |
651 | 509 if text is None: |
0
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510 last = self.length(base) |
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511 text = decompress(data[:last]) |
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512 |
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513 bins = [] |
64 | 514 for r in xrange(base + 1, rev + 1): |
0
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515 s = self.length(r) |
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516 bins.append(decompress(data[last:last + s])) |
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517 last = last + s |
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518 |
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519 text = mdiff.patches(text, bins) |
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520 |
26 | 521 if node != hash(text, p1, p2): |
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522 raise RevlogError(_("integrity check failed on %s:%d") |
98 | 523 % (self.datafile, rev)) |
0
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524 |
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525 self.cache = (node, rev, text) |
515 | 526 return text |
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527 |
644 | 528 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
1083 | 529 """add a revision to the log |
530 | |
531 text - the revision data to add | |
532 transaction - the transaction object used for rollback | |
533 link - the linkrev data to add | |
534 p1, p2 - the parent nodeids of the revision | |
535 d - an optional precomputed delta | |
536 """ | |
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537 if text is None: text = "" |
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538 if p1 is None: p1 = self.tip() |
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539 if p2 is None: p2 = nullid |
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540 |
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541 node = hash(text, p1, p2) |
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542 |
301 | 543 if node in self.nodemap: |
544 return node | |
545 | |
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546 n = self.count() |
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547 t = n - 1 |
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548 |
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549 if n: |
64 | 550 base = self.base(t) |
551 start = self.start(base) | |
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552 end = self.end(t) |
644 | 553 if not d: |
554 prev = self.revision(self.tip()) | |
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555 d = self.diff(prev, str(text)) |
98 | 556 data = compress(d) |
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557 l = len(data[1]) + len(data[0]) |
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558 dist = end - start + l |
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559 |
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560 # full versions are inserted when the needed deltas |
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561 # become comparable to the uncompressed text |
64 | 562 if not n or dist > len(text) * 2: |
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563 data = compress(text) |
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564 l = len(data[1]) + len(data[0]) |
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565 base = n |
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566 else: |
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567 base = self.base(t) |
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568 |
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569 offset = 0 |
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570 if t >= 0: |
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571 offset = self.end(t) |
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572 |
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573 e = (offset, l, base, link, p1, p2, node) |
515 | 574 |
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575 self.index.append(e) |
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576 self.nodemap[node] = n |
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577 entry = struct.pack(indexformat, *e) |
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578 |
26 | 579 transaction.add(self.datafile, e[0]) |
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580 f = self.opener(self.datafile, "a") |
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581 if data[0]: |
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582 f.write(data[0]) |
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583 f.write(data[1]) |
41 | 584 transaction.add(self.indexfile, n * len(entry)) |
0
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585 self.opener(self.indexfile, "a").write(entry) |
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586 |
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587 self.cache = (node, n, text) |
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588 return node |
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589 |
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590 def ancestor(self, a, b): |
1083 | 591 """calculate the least common ancestor of nodes a and b""" |
147 | 592 # calculate the distance of every node from root |
593 dist = {nullid: 0} | |
594 for i in xrange(self.count()): | |
595 n = self.node(i) | |
596 p1, p2 = self.parents(n) | |
597 dist[n] = max(dist[p1], dist[p2]) + 1 | |
515 | 598 |
147 | 599 # traverse ancestors in order of decreasing distance from root |
600 def ancestors(node): | |
601 # we store negative distances because heap returns smallest member | |
602 h = [(-dist[node], node)] | |
603 seen = {} | |
604 earliest = self.count() | |
605 while h: | |
606 d, n = heapq.heappop(h) | |
607 if n not in seen: | |
608 seen[n] = 1 | |
381 | 609 r = self.rev(n) |
1351
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diff
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610 yield (-d, n) |
147 | 611 for p in self.parents(n): |
612 heapq.heappush(h, (-dist[p], p)) | |
45
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613 |
1351
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614 def generations(node): |
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615 sg, s = None, {} |
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616 for g,n in ancestors(node): |
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617 if g != sg: |
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618 if sg: |
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619 yield sg, s |
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620 sg, s = g, {n:1} |
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621 else: |
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|
622 s[n] = 1 |
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623 yield sg, s |
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624 |
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625 x = generations(a) |
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626 y = generations(b) |
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627 gx = x.next() |
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628 gy = y.next() |
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629 |
147 | 630 # increment each ancestor list until it is closer to root than |
631 # the other, or they match | |
632 while 1: | |
1351
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633 #print "ancestor gen %s %s" % (gx[0], gy[0]) |
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634 if gx[0] == gy[0]: |
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635 # find the intersection |
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636 i = [ n for n in gx[1] if n in gy[1] ] |
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637 if i: |
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638 return i[0] |
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639 else: |
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640 #print "next" |
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641 gy = y.next() |
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642 gx = x.next() |
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643 elif gx[0] < gy[0]: |
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644 #print "next y" |
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645 gy = y.next() |
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646 else: |
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647 #print "next x" |
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648 gx = x.next() |
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649 |
1458
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Eric Hopper <hopper@omnifarious.org>
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650 def group(self, nodelist, lookup, infocollect = None): |
1083 | 651 """calculate a delta group |
46 | 652 |
1083 | 653 Given a list of changeset revs, return a set of deltas and |
654 metadata corresponding to nodes. the first delta is | |
655 parent(nodes[0]) -> nodes[0] the receiver is guaranteed to | |
656 have this parent as it has all history before these | |
657 changesets. parent is parent[0] | |
658 """ | |
1458
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659 revs = [self.rev(n) for n in nodelist] |
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660 needed = dict.fromkeys(revs, 1) |
46 | 661 |
662 # if we don't have any revisions touched by these changesets, bail | |
192 | 663 if not revs: |
664 yield struct.pack(">l", 0) | |
665 return | |
46 | 666 |
667 # add the parent of the first rev | |
668 p = self.parents(self.node(revs[0]))[0] | |
669 revs.insert(0, self.rev(p)) | |
670 | |
671 # for each delta that isn't contiguous in the log, we need to | |
672 # reconstruct the base, reconstruct the result, and then | |
673 # calculate the delta. We also need to do this where we've | |
674 # stored a full version and not a delta | |
675 for i in xrange(0, len(revs) - 1): | |
676 a, b = revs[i], revs[i + 1] | |
677 if a + 1 != b or self.base(b) == b: | |
678 for j in xrange(self.base(a), a + 1): | |
679 needed[j] = 1 | |
680 for j in xrange(self.base(b), b + 1): | |
681 needed[j] = 1 | |
682 | |
683 # calculate spans to retrieve from datafile | |
684 needed = needed.keys() | |
685 needed.sort() | |
686 spans = [] | |
192 | 687 oo = -1 |
688 ol = 0 | |
46 | 689 for n in needed: |
690 if n < 0: continue | |
691 o = self.start(n) | |
692 l = self.length(n) | |
192 | 693 if oo + ol == o: # can we merge with the previous? |
694 nl = spans[-1][2] | |
695 nl.append((n, l)) | |
696 ol += l | |
697 spans[-1] = (oo, ol, nl) | |
46 | 698 else: |
192 | 699 oo = o |
700 ol = l | |
701 spans.append((oo, ol, [(n, l)])) | |
46 | 702 |
703 # read spans in, divide up chunks | |
704 chunks = {} | |
192 | 705 for span in spans: |
46 | 706 # we reopen the file for each span to make http happy for now |
707 f = self.opener(self.datafile) | |
708 f.seek(span[0]) | |
709 data = f.read(span[1]) | |
710 | |
711 # divide up the span | |
712 pos = 0 | |
713 for r, l in span[2]: | |
192 | 714 chunks[r] = decompress(data[pos: pos + l]) |
46 | 715 pos += l |
716 | |
717 # helper to reconstruct intermediate versions | |
718 def construct(text, base, rev): | |
192 | 719 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
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67
diff
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|
720 return mdiff.patches(text, bins) |
46 | 721 |
722 # build deltas | |
723 deltas = [] | |
71
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Add mdiff.patches to speed up applying thousands of patches to the manifest
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67
diff
changeset
|
724 for d in xrange(0, len(revs) - 1): |
46 | 725 a, b = revs[d], revs[d + 1] |
726 n = self.node(b) | |
192 | 727 |
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This changes the revlog.group and re-implements the localrepo.changeroup
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|
728 if infocollect is not None: |
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This changes the revlog.group and re-implements the localrepo.changeroup
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|
729 infocollect(n) |
1033892bbb87
This changes the revlog.group and re-implements the localrepo.changeroup
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1457
diff
changeset
|
730 |
192 | 731 # do we need to construct a new delta? |
46 | 732 if a + 1 != b or self.base(b) == b: |
733 if a >= 0: | |
734 base = self.base(a) | |
192 | 735 ta = chunks[self.base(a)] |
46 | 736 ta = construct(ta, base, a) |
737 else: | |
738 ta = "" | |
515 | 739 |
46 | 740 base = self.base(b) |
741 if a > base: | |
742 base = a | |
743 tb = ta | |
744 else: | |
192 | 745 tb = chunks[self.base(b)] |
46 | 746 tb = construct(tb, base, b) |
747 d = self.diff(ta, tb) | |
748 else: | |
192 | 749 d = chunks[b] |
46 | 750 |
751 p = self.parents(n) | |
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752 meta = n + p[0] + p[1] + lookup(n) |
46 | 753 l = struct.pack(">l", len(meta) + len(d) + 4) |
192 | 754 yield l |
755 yield meta | |
756 yield d | |
46 | 757 |
192 | 758 yield struct.pack(">l", 0) |
759 | |
1062 | 760 def addgroup(self, revs, linkmapper, transaction, unique=0): |
1083 | 761 """ |
762 add a delta group | |
46 | 763 |
1083 | 764 given a set of deltas, add them to the revision log. the |
765 first delta is against its parent, which should be in our | |
766 log, the rest are against the previous delta. | |
767 """ | |
768 | |
769 #track the base of the current delta log | |
46 | 770 r = self.count() |
771 t = r - 1 | |
192 | 772 node = nullid |
515 | 773 |
655 | 774 base = prev = -1 |
653
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Fix corruption resulting from skipping parts of a revision group
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775 start = end = measure = 0 |
46 | 776 if r: |
777 start = self.start(self.base(t)) | |
778 end = self.end(t) | |
779 measure = self.length(self.base(t)) | |
780 base = self.base(t) | |
781 prev = self.tip() | |
782 | |
783 transaction.add(self.datafile, end) | |
784 transaction.add(self.indexfile, r * struct.calcsize(indexformat)) | |
785 dfh = self.opener(self.datafile, "a") | |
786 ifh = self.opener(self.indexfile, "a") | |
787 | |
788 # loop through our set of deltas | |
192 | 789 chain = None |
790 for chunk in revs: | |
791 node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) | |
94 | 792 link = linkmapper(cs) |
77 | 793 if node in self.nodemap: |
224
ccbcc4d76f81
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221
diff
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794 # this can happen if two branches make the same change |
1218
cde6818e082a
Add preliminary support for the bundle and unbundle commands
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795 # if unique: |
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9d2c2e6b32b5
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
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diff
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796 # raise RevlogError(_("already have %s") % hex(node[:4])) |
653
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diff
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|
797 chain = node |
224
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|
798 continue |
192 | 799 delta = chunk[80:] |
800 | |
1509
46a07392cf28
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801 for p in (p1, p2): |
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802 if not p in self.nodemap: |
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diff
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|
803 raise RevlogError(_("unknown parent %s") % short(p1)) |
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changeset
|
804 |
192 | 805 if not chain: |
806 # retrieve the parent revision of the delta chain | |
807 chain = p1 | |
808 if not chain in self.nodemap: | |
1402
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diff
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809 raise RevlogError(_("unknown base %s") % short(chain[:4])) |
46 | 810 |
811 # full versions are inserted when the needed deltas become | |
812 # comparable to the uncompressed text or when the previous | |
813 # version is not the one we have a delta against. We use | |
814 # the size of the previous full rev as a proxy for the | |
815 # current size. | |
816 | |
817 if chain == prev: | |
1533
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Reduce string duplication in compression code
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diff
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|
818 tempd = compress(delta) |
3d11f81c9145
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parents:
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diff
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|
819 cdelta = tempd[0] + tempd[1] |
46 | 820 |
821 if chain != prev or (end - start + len(cdelta)) > measure * 2: | |
822 # flush our writes here so we can read it in revision | |
823 dfh.flush() | |
824 ifh.flush() | |
65
d40cc5aacc31
Fix up a bunch of bugs in the new merge code
mpm@selenic.com
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64
diff
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|
825 text = self.revision(chain) |
73 | 826 text = self.patches(text, [delta]) |
46 | 827 chk = self.addrevision(text, transaction, link, p1, p2) |
828 if chk != node: | |
1402
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diff
changeset
|
829 raise RevlogError(_("consistency error adding group")) |
46 | 830 measure = len(text) |
831 else: | |
832 e = (end, len(cdelta), self.base(t), link, p1, p2, node) | |
833 self.index.append(e) | |
834 self.nodemap[node] = r | |
835 dfh.write(cdelta) | |
836 ifh.write(struct.pack(indexformat, *e)) | |
837 | |
65
d40cc5aacc31
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64
diff
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|
838 t, r, chain, prev = r, r + 1, node, node |
46 | 839 start = self.start(self.base(t)) |
840 end = self.end(t) | |
841 | |
842 dfh.close() | |
843 ifh.close() | |
844 return node | |
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1a216cb4ee64
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|
845 |
1535
7ae0ce7a3dc4
Add revlog.strip to truncate away revisions.
mason@suse.com
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diff
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|
846 def strip(self, rev, minlink): |
7ae0ce7a3dc4
Add revlog.strip to truncate away revisions.
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diff
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|
847 if self.count() == 0 or rev >= self.count(): |
7ae0ce7a3dc4
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|
848 return |
7ae0ce7a3dc4
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changeset
|
849 |
7ae0ce7a3dc4
Add revlog.strip to truncate away revisions.
mason@suse.com
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diff
changeset
|
850 # When stripping away a revision, we need to make sure it |
7ae0ce7a3dc4
Add revlog.strip to truncate away revisions.
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parents:
1533
diff
changeset
|
851 # does not actually belong to an older changeset. |
7ae0ce7a3dc4
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mason@suse.com
parents:
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diff
changeset
|
852 # The minlink parameter defines the oldest revision |
7ae0ce7a3dc4
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diff
changeset
|
853 # we're allowed to strip away. |
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mason@suse.com
parents:
1533
diff
changeset
|
854 while minlink > self.index[rev][3]: |
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mason@suse.com
parents:
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diff
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855 rev += 1 |
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parents:
1533
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856 if rev >= self.count(): |
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|
857 return |
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mason@suse.com
parents:
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|
858 |
7ae0ce7a3dc4
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mason@suse.com
parents:
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diff
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|
859 # first truncate the files on disk |
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|
860 end = self.start(rev) |
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diff
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861 self.opener(self.datafile, "a").truncate(end) |
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|
862 end = rev * struct.calcsize(indexformat) |
7ae0ce7a3dc4
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diff
changeset
|
863 self.opener(self.indexfile, "a").truncate(end) |
7ae0ce7a3dc4
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parents:
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diff
changeset
|
864 |
7ae0ce7a3dc4
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diff
changeset
|
865 # then reset internal state in memory to forget those revisions |
7ae0ce7a3dc4
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diff
changeset
|
866 self.cache = None |
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parents:
1533
diff
changeset
|
867 for p in self.index[rev:]: |
7ae0ce7a3dc4
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parents:
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diff
changeset
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868 del self.nodemap[p[6]] |
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Add revlog.strip to truncate away revisions.
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parents:
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diff
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869 del self.index[rev:] |
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mason@suse.com
parents:
1533
diff
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|
870 |
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Add revlog.strip to truncate away revisions.
mason@suse.com
parents:
1533
diff
changeset
|
871 # truncating the lazyindex also truncates the lazymap. |
7ae0ce7a3dc4
Add revlog.strip to truncate away revisions.
mason@suse.com
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1533
diff
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872 if isinstance(self.index, lazyindex): |
7ae0ce7a3dc4
Add revlog.strip to truncate away revisions.
mason@suse.com
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|
873 self.index.trunc(end) |
7ae0ce7a3dc4
Add revlog.strip to truncate away revisions.
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changeset
|
874 |
7ae0ce7a3dc4
Add revlog.strip to truncate away revisions.
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|
875 |
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1a216cb4ee64
verify: add check for mismatch of index and data length
Matt Mackall <mpm@selenic.com>
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|
876 def checksize(self): |
1a216cb4ee64
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Matt Mackall <mpm@selenic.com>
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|
877 expected = 0 |
1a216cb4ee64
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Matt Mackall <mpm@selenic.com>
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|
878 if self.count(): |
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verify: add check for mismatch of index and data length
Matt Mackall <mpm@selenic.com>
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|
879 expected = self.end(self.count() - 1) |
1494
249ca10d37f4
Handle empty logs in repo.checksize
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diff
changeset
|
880 try: |
249ca10d37f4
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diff
changeset
|
881 f = self.opener(self.datafile) |
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parents:
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diff
changeset
|
882 f.seek(0, 2) |
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parents:
1493
diff
changeset
|
883 actual = f.tell() |
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Handle empty logs in repo.checksize
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parents:
1493
diff
changeset
|
884 return expected - actual |
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parents:
1493
diff
changeset
|
885 except IOError, inst: |
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diff
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|
886 if inst.errno == errno.ENOENT: |
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parents:
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diff
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887 return 0 |
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Matt Mackall <mpm@selenic.com>
parents:
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diff
changeset
|
888 raise |
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parents:
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diff
changeset
|
889 |
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parents:
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diff
changeset
|
890 |