Mercurial > hg
annotate mercurial/revlog.py @ 1847:94498a262d15
fix annotate for removed files
walk in the manifest files instead of the working dir files
when running annotate
author | Benoit Boissinot <benoit.boissinot@ens-lyon.org> |
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date | Tue, 07 Mar 2006 20:37:27 +0100 |
parents | 2e0a288ca93e |
children | 5ac811b720de |
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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 os 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(object): |
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(object): |
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) |
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117 class lazymap(object): |
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(object): |
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 |
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191 self.indexstat = None |
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192 self.cache = None |
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193 self.chunkcache = None |
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194 self.load() |
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195 |
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196 def load(self): |
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197 try: |
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198 f = self.opener(self.indexfile) |
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199 except IOError, inst: |
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200 if inst.errno != errno.ENOENT: |
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201 raise |
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202 i = "" |
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203 else: |
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204 try: |
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205 st = os.fstat(f.fileno()) |
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206 except AttributeError, inst: |
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207 st = None |
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208 else: |
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209 oldst = self.indexstat |
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210 if (oldst and st.st_dev == oldst.st_dev |
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211 and st.st_ino == oldst.st_ino |
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212 and st.st_mtime == oldst.st_mtime |
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213 and st.st_ctime == oldst.st_ctime): |
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214 return |
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215 self.indexstat = st |
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216 i = f.read() |
116
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217 |
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218 if i and i[:4] != "\0\0\0\0": |
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219 raise RevlogError(_("incompatible revlog signature on %s") % |
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220 self.indexfile) |
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221 |
116
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222 if len(i) > 10000: |
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223 # big index, let's parse it on demand |
323 | 224 parser = lazyparser(i, self) |
116
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225 self.index = lazyindex(parser) |
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226 self.nodemap = lazymap(parser) |
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227 else: |
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228 s = struct.calcsize(indexformat) |
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229 l = len(i) / s |
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230 self.index = [None] * l |
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231 m = [None] * l |
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232 |
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233 n = 0 |
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234 for f in xrange(0, l * s, s): |
116
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235 # offset, size, base, linkrev, p1, p2, nodeid |
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236 e = struct.unpack(indexformat, i[f:f + s]) |
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237 m[n] = (e[6], n) |
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238 self.index[n] = e |
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239 n += 1 |
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240 |
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241 self.nodemap = dict(m) |
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242 self.nodemap[nullid] = -1 |
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243 |
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244 def tip(self): return self.node(len(self.index) - 1) |
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245 def count(self): return len(self.index) |
26 | 246 def node(self, rev): return (rev < 0) and nullid or self.index[rev][6] |
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247 def rev(self, node): |
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248 try: |
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249 return self.nodemap[node] |
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250 except KeyError: |
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251 raise RevlogError(_('%s: no node %s') % (self.indexfile, hex(node))) |
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252 def linkrev(self, node): return self.index[self.rev(node)][3] |
2 | 253 def parents(self, node): |
254 if node == nullid: return (nullid, nullid) | |
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255 return self.index[self.rev(node)][4:6] |
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256 |
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257 def start(self, rev): return self.index[rev][0] |
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258 def length(self, rev): return self.index[rev][1] |
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259 def end(self, rev): return self.start(rev) + self.length(rev) |
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260 def base(self, rev): return self.index[rev][2] |
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261 |
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262 def reachable(self, rev, stop=None): |
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263 reachable = {} |
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264 visit = [rev] |
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265 reachable[rev] = 1 |
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266 if stop: |
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267 stopn = self.rev(stop) |
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268 else: |
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269 stopn = 0 |
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270 while visit: |
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271 n = visit.pop(0) |
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272 if n == stop: |
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273 continue |
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274 if n == nullid: |
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275 continue |
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276 for p in self.parents(n): |
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277 if self.rev(p) < stopn: |
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278 continue |
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279 if p not in reachable: |
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280 reachable[p] = 1 |
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281 visit.append(p) |
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282 return reachable |
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283 |
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284 def nodesbetween(self, roots=None, heads=None): |
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285 """Return a tuple containing three elements. Elements 1 and 2 contain |
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286 a final list bases and heads after all the unreachable ones have been |
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287 pruned. Element 0 contains a topologically sorted list of all |
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288 |
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289 nodes that satisfy these constraints: |
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290 1. All nodes must be descended from a node in roots (the nodes on |
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291 roots are considered descended from themselves). |
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292 2. All nodes must also be ancestors of a node in heads (the nodes in |
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293 heads are considered to be their own ancestors). |
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294 |
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295 If roots is unspecified, nullid is assumed as the only root. |
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296 If heads is unspecified, it is taken to be the output of the |
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297 heads method (i.e. a list of all nodes in the repository that |
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298 have no children).""" |
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299 nonodes = ([], [], []) |
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300 if roots is not None: |
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301 roots = list(roots) |
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302 if not roots: |
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303 return nonodes |
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304 lowestrev = min([self.rev(n) for n in roots]) |
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305 else: |
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306 roots = [nullid] # Everybody's a descendent of nullid |
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307 lowestrev = -1 |
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308 if (lowestrev == -1) and (heads is None): |
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309 # We want _all_ the nodes! |
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310 return ([self.node(r) for r in xrange(0, self.count())], |
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311 [nullid], list(self.heads())) |
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312 if heads is None: |
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313 # All nodes are ancestors, so the latest ancestor is the last |
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314 # node. |
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315 highestrev = self.count() - 1 |
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316 # Set ancestors to None to signal that every node is an ancestor. |
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317 ancestors = None |
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318 # Set heads to an empty dictionary for later discovery of heads |
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319 heads = {} |
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320 else: |
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321 heads = list(heads) |
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322 if not heads: |
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323 return nonodes |
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324 ancestors = {} |
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325 # Start at the top and keep marking parents until we're done. |
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326 nodestotag = heads[:] |
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327 # Turn heads into a dictionary so we can remove 'fake' heads. |
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328 # Also, later we will be using it to filter out the heads we can't |
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329 # find from roots. |
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330 heads = dict.fromkeys(heads, 0) |
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331 # Remember where the top was so we can use it as a limit later. |
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332 highestrev = max([self.rev(n) for n in nodestotag]) |
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333 while nodestotag: |
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334 # grab a node to tag |
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335 n = nodestotag.pop() |
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336 # Never tag nullid |
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337 if n == nullid: |
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338 continue |
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339 # A node's revision number represents its place in a |
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340 # topologically sorted list of nodes. |
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341 r = self.rev(n) |
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342 if r >= lowestrev: |
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343 if n not in ancestors: |
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344 # If we are possibly a descendent of one of the roots |
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345 # and we haven't already been marked as an ancestor |
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346 ancestors[n] = 1 # Mark as ancestor |
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347 # Add non-nullid parents to list of nodes to tag. |
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348 nodestotag.extend([p for p in self.parents(n) if |
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349 p != nullid]) |
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350 elif n in heads: # We've seen it before, is it a fake head? |
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351 # So it is, real heads should not be the ancestors of |
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352 # any other heads. |
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353 heads.pop(n) |
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354 if not ancestors: |
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355 return nonodes |
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356 # Now that we have our set of ancestors, we want to remove any |
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357 # roots that are not ancestors. |
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358 |
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359 # If one of the roots was nullid, everything is included anyway. |
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360 if lowestrev > -1: |
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361 # But, since we weren't, let's recompute the lowest rev to not |
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362 # include roots that aren't ancestors. |
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363 |
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364 # Filter out roots that aren't ancestors of heads |
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365 roots = [n for n in roots if n in ancestors] |
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366 # Recompute the lowest revision |
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367 if roots: |
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368 lowestrev = min([self.rev(n) for n in roots]) |
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369 else: |
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370 # No more roots? Return empty list |
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371 return nonodes |
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372 else: |
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373 # We are descending from nullid, and don't need to care about |
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374 # any other roots. |
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375 lowestrev = -1 |
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376 roots = [nullid] |
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377 # Transform our roots list into a 'set' (i.e. a dictionary where the |
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378 # values don't matter. |
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379 descendents = dict.fromkeys(roots, 1) |
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380 # Also, keep the original roots so we can filter out roots that aren't |
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381 # 'real' roots (i.e. are descended from other roots). |
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382 roots = descendents.copy() |
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383 # Our topologically sorted list of output nodes. |
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384 orderedout = [] |
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385 # Don't start at nullid since we don't want nullid in our output list, |
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386 # and if nullid shows up in descedents, empty parents will look like |
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387 # they're descendents. |
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388 for r in xrange(max(lowestrev, 0), highestrev + 1): |
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389 n = self.node(r) |
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390 isdescendent = False |
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391 if lowestrev == -1: # Everybody is a descendent of nullid |
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392 isdescendent = True |
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393 elif n in descendents: |
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394 # n is already a descendent |
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395 isdescendent = True |
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396 # This check only needs to be done here because all the roots |
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397 # will start being marked is descendents before the loop. |
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398 if n in roots: |
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399 # If n was a root, check if it's a 'real' root. |
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400 p = tuple(self.parents(n)) |
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401 # If any of its parents are descendents, it's not a root. |
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402 if (p[0] in descendents) or (p[1] in descendents): |
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403 roots.pop(n) |
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404 else: |
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405 p = tuple(self.parents(n)) |
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406 # A node is a descendent if either of its parents are |
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407 # descendents. (We seeded the dependents list with the roots |
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408 # up there, remember?) |
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409 if (p[0] in descendents) or (p[1] in descendents): |
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410 descendents[n] = 1 |
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411 isdescendent = True |
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412 if isdescendent and ((ancestors is None) or (n in ancestors)): |
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413 # Only include nodes that are both descendents and ancestors. |
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414 orderedout.append(n) |
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415 if (ancestors is not None) and (n in heads): |
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416 # We're trying to figure out which heads are reachable |
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417 # from roots. |
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418 # Mark this head as having been reached |
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419 heads[n] = 1 |
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420 elif ancestors is None: |
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421 # Otherwise, we're trying to discover the heads. |
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422 # Assume this is a head because if it isn't, the next step |
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423 # will eventually remove it. |
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424 heads[n] = 1 |
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425 # But, obviously its parents aren't. |
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426 for p in self.parents(n): |
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427 heads.pop(p, None) |
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428 heads = [n for n in heads.iterkeys() if heads[n] != 0] |
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429 roots = roots.keys() |
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430 assert orderedout |
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431 assert roots |
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432 assert heads |
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433 return (orderedout, roots, heads) |
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434 |
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435 def heads(self, start=None): |
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436 """return the list of all nodes that have no children |
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437 |
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438 if start is specified, only heads that are descendants of |
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439 start will be returned |
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440 |
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441 """ |
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442 if start is None: |
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443 start = nullid |
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444 reachable = {start: 1} |
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445 heads = {start: 1} |
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446 startrev = self.rev(start) |
1083 | 447 |
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448 for r in xrange(startrev + 1, self.count()): |
221 | 449 n = self.node(r) |
450 for pn in self.parents(n): | |
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451 if pn in reachable: |
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452 reachable[n] = 1 |
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453 heads[n] = 1 |
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454 if pn in heads: |
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455 del heads[pn] |
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456 return heads.keys() |
370 | 457 |
458 def children(self, node): | |
1083 | 459 """find the children of a given node""" |
370 | 460 c = [] |
461 p = self.rev(node) | |
462 for r in range(p + 1, self.count()): | |
463 n = self.node(r) | |
464 for pn in self.parents(n): | |
854
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465 if pn == node: |
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466 c.append(n) |
370 | 467 continue |
468 elif pn == nullid: | |
469 continue | |
470 return c | |
515 | 471 |
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472 def lookup(self, id): |
1083 | 473 """locate a node based on revision number or subset of hex nodeid""" |
36
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474 try: |
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475 rev = int(id) |
469 | 476 if str(rev) != id: raise ValueError |
477 if rev < 0: rev = self.count() + rev | |
476
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478 if rev < 0 or rev >= self.count(): raise ValueError |
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479 return self.node(rev) |
469 | 480 except (ValueError, OverflowError): |
36
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481 c = [] |
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482 for n in self.nodemap: |
469 | 483 if hex(n).startswith(id): |
36
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484 c.append(n) |
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485 if len(c) > 1: raise RevlogError(_("Ambiguous identifier")) |
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486 if len(c) < 1: raise RevlogError(_("No match found")) |
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487 return c[0] |
515 | 488 |
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489 return None |
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490 |
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491 def diff(self, a, b): |
1083 | 492 """return a delta between two revisions""" |
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493 return mdiff.textdiff(a, b) |
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494 |
73 | 495 def patches(self, t, pl): |
1083 | 496 """apply a list of patches to a string""" |
73 | 497 return mdiff.patches(t, pl) |
498 | |
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499 def chunk(self, rev): |
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500 start, length = self.start(rev), self.length(rev) |
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501 end = start + length |
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502 |
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503 def loadcache(): |
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504 cache_length = max(4096 * 1024, length) # 4Mo |
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505 df = self.opener(self.datafile) |
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506 df.seek(start) |
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507 self.chunkcache = (start, df.read(cache_length)) |
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508 |
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509 if not self.chunkcache: |
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510 loadcache() |
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511 |
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512 cache_start = self.chunkcache[0] |
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513 cache_end = cache_start + len(self.chunkcache[1]) |
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514 if start >= cache_start and end <= cache_end: |
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515 # it is cached |
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516 offset = start - cache_start |
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517 else: |
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518 loadcache() |
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519 offset = 0 |
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520 |
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521 #def checkchunk(): |
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522 # df = self.opener(self.datafile) |
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523 # df.seek(start) |
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524 # return df.read(length) |
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525 #assert s == checkchunk() |
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526 return decompress(self.chunkcache[1][offset:offset + length]) |
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527 |
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528 def delta(self, node): |
1083 | 529 """return or calculate a delta between a node and its predecessor""" |
119
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530 r = self.rev(node) |
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531 b = self.base(r) |
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532 if r == b: |
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533 return self.diff(self.revision(self.node(r - 1)), |
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534 self.revision(node)) |
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535 else: |
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536 return self.chunk(r) |
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537 |
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538 def revision(self, node): |
1083 | 539 """return an uncompressed revision of a given""" |
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540 if node == nullid: return "" |
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541 if self.cache and self.cache[0] == node: return self.cache[2] |
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542 |
1083 | 543 # look up what we need to read |
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544 text = None |
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545 rev = self.rev(node) |
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546 base = self.base(rev) |
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547 |
1083 | 548 # do we have useful data cached? |
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549 if self.cache and self.cache[1] >= base and self.cache[1] < rev: |
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550 base = self.cache[1] |
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551 text = self.cache[2] |
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552 else: |
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553 text = self.chunk(base) |
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554 |
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555 bins = [] |
64 | 556 for r in xrange(base + 1, rev + 1): |
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557 bins.append(self.chunk(r)) |
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558 |
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559 text = mdiff.patches(text, bins) |
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560 |
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561 p1, p2 = self.parents(node) |
26 | 562 if node != hash(text, p1, p2): |
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563 raise RevlogError(_("integrity check failed on %s:%d") |
98 | 564 % (self.datafile, rev)) |
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565 |
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566 self.cache = (node, rev, text) |
515 | 567 return text |
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568 |
644 | 569 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
1083 | 570 """add a revision to the log |
571 | |
572 text - the revision data to add | |
573 transaction - the transaction object used for rollback | |
574 link - the linkrev data to add | |
575 p1, p2 - the parent nodeids of the revision | |
576 d - an optional precomputed delta | |
577 """ | |
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578 if text is None: text = "" |
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579 if p1 is None: p1 = self.tip() |
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580 if p2 is None: p2 = nullid |
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581 |
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582 node = hash(text, p1, p2) |
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583 |
301 | 584 if node in self.nodemap: |
585 return node | |
586 | |
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587 n = self.count() |
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588 t = n - 1 |
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589 |
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590 if n: |
64 | 591 base = self.base(t) |
592 start = self.start(base) | |
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593 end = self.end(t) |
644 | 594 if not d: |
595 prev = self.revision(self.tip()) | |
1533
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596 d = self.diff(prev, str(text)) |
98 | 597 data = compress(d) |
1533
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598 l = len(data[1]) + len(data[0]) |
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599 dist = end - start + l |
0
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600 |
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601 # full versions are inserted when the needed deltas |
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602 # become comparable to the uncompressed text |
64 | 603 if not n or dist > len(text) * 2: |
0
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604 data = compress(text) |
1533
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605 l = len(data[1]) + len(data[0]) |
0
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606 base = n |
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607 else: |
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608 base = self.base(t) |
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609 |
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610 offset = 0 |
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611 if t >= 0: |
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612 offset = self.end(t) |
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613 |
1533
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614 e = (offset, l, base, link, p1, p2, node) |
515 | 615 |
0
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616 self.index.append(e) |
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617 self.nodemap[node] = n |
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618 entry = struct.pack(indexformat, *e) |
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619 |
26 | 620 transaction.add(self.datafile, e[0]) |
1533
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621 f = self.opener(self.datafile, "a") |
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622 if data[0]: |
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623 f.write(data[0]) |
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624 f.write(data[1]) |
41 | 625 transaction.add(self.indexfile, n * len(entry)) |
0
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626 self.opener(self.indexfile, "a").write(entry) |
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627 |
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628 self.cache = (node, n, text) |
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629 return node |
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630 |
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631 def ancestor(self, a, b): |
1083 | 632 """calculate the least common ancestor of nodes a and b""" |
147 | 633 # calculate the distance of every node from root |
634 dist = {nullid: 0} | |
635 for i in xrange(self.count()): | |
636 n = self.node(i) | |
637 p1, p2 = self.parents(n) | |
638 dist[n] = max(dist[p1], dist[p2]) + 1 | |
515 | 639 |
147 | 640 # traverse ancestors in order of decreasing distance from root |
641 def ancestors(node): | |
642 # we store negative distances because heap returns smallest member | |
643 h = [(-dist[node], node)] | |
644 seen = {} | |
645 while h: | |
646 d, n = heapq.heappop(h) | |
647 if n not in seen: | |
648 seen[n] = 1 | |
1351
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649 yield (-d, n) |
147 | 650 for p in self.parents(n): |
651 heapq.heappush(h, (-dist[p], p)) | |
45
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652 |
1351
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653 def generations(node): |
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654 sg, s = None, {} |
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655 for g,n in ancestors(node): |
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656 if g != sg: |
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657 if sg: |
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658 yield sg, s |
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659 sg, s = g, {n:1} |
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660 else: |
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661 s[n] = 1 |
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662 yield sg, s |
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663 |
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664 x = generations(a) |
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665 y = generations(b) |
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666 gx = x.next() |
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667 gy = y.next() |
45
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668 |
147 | 669 # increment each ancestor list until it is closer to root than |
670 # the other, or they match | |
671 while 1: | |
1351
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672 #print "ancestor gen %s %s" % (gx[0], gy[0]) |
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673 if gx[0] == gy[0]: |
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674 # find the intersection |
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675 i = [ n for n in gx[1] if n in gy[1] ] |
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676 if i: |
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677 return i[0] |
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678 else: |
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679 #print "next" |
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680 gy = y.next() |
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681 gx = x.next() |
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682 elif gx[0] < gy[0]: |
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683 #print "next y" |
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684 gy = y.next() |
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685 else: |
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686 #print "next x" |
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687 gx = x.next() |
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688 |
1598
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cleanup of revlog.group when repository is local
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
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diff
changeset
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689 def group(self, nodelist, lookup, infocollect=None): |
1083 | 690 """calculate a delta group |
46 | 691 |
1083 | 692 Given a list of changeset revs, return a set of deltas and |
693 metadata corresponding to nodes. the first delta is | |
694 parent(nodes[0]) -> nodes[0] the receiver is guaranteed to | |
695 have this parent as it has all history before these | |
696 changesets. parent is parent[0] | |
697 """ | |
1458
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This changes the revlog.group and re-implements the localrepo.changeroup
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diff
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|
698 revs = [self.rev(n) for n in nodelist] |
46 | 699 |
700 # if we don't have any revisions touched by these changesets, bail | |
192 | 701 if not revs: |
702 yield struct.pack(">l", 0) | |
703 return | |
46 | 704 |
705 # add the parent of the first rev | |
706 p = self.parents(self.node(revs[0]))[0] | |
707 revs.insert(0, self.rev(p)) | |
708 | |
709 # build deltas | |
71
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diff
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|
710 for d in xrange(0, len(revs) - 1): |
46 | 711 a, b = revs[d], revs[d + 1] |
1598
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cleanup of revlog.group when repository is local
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|
712 na = self.node(a) |
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|
713 nb = self.node(b) |
192 | 714 |
1458
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|
715 if infocollect is not None: |
1598
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
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diff
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|
716 infocollect(nb) |
1458
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|
717 |
192 | 718 # do we need to construct a new delta? |
46 | 719 if a + 1 != b or self.base(b) == b: |
1598
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720 ta = self.revision(na) |
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721 tb = self.revision(nb) |
46 | 722 d = self.diff(ta, tb) |
723 else: | |
1598
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|
724 d = self.chunk(b) |
46 | 725 |
1598
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|
726 p = self.parents(nb) |
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|
727 meta = nb + p[0] + p[1] + lookup(nb) |
46 | 728 l = struct.pack(">l", len(meta) + len(d) + 4) |
192 | 729 yield l |
730 yield meta | |
731 yield d | |
46 | 732 |
192 | 733 yield struct.pack(">l", 0) |
734 | |
1062 | 735 def addgroup(self, revs, linkmapper, transaction, unique=0): |
1083 | 736 """ |
737 add a delta group | |
46 | 738 |
1083 | 739 given a set of deltas, add them to the revision log. the |
740 first delta is against its parent, which should be in our | |
741 log, the rest are against the previous delta. | |
742 """ | |
743 | |
744 #track the base of the current delta log | |
46 | 745 r = self.count() |
746 t = r - 1 | |
192 | 747 node = nullid |
515 | 748 |
655 | 749 base = prev = -1 |
653
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|
750 start = end = measure = 0 |
46 | 751 if r: |
1749
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|
752 base = self.base(t) |
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|
753 start = self.start(base) |
46 | 754 end = self.end(t) |
1749
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
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diff
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|
755 measure = self.length(base) |
46 | 756 prev = self.tip() |
757 | |
758 transaction.add(self.datafile, end) | |
759 transaction.add(self.indexfile, r * struct.calcsize(indexformat)) | |
760 dfh = self.opener(self.datafile, "a") | |
761 ifh = self.opener(self.indexfile, "a") | |
762 | |
763 # loop through our set of deltas | |
192 | 764 chain = None |
765 for chunk in revs: | |
766 node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) | |
94 | 767 link = linkmapper(cs) |
77 | 768 if node in self.nodemap: |
224
ccbcc4d76f81
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221
diff
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|
769 # this can happen if two branches make the same change |
1218
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1214
diff
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|
770 # if unique: |
1402
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1400
diff
changeset
|
771 # raise RevlogError(_("already have %s") % hex(node[:4])) |
653
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parents:
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diff
changeset
|
772 chain = node |
224
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diff
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773 continue |
192 | 774 delta = chunk[80:] |
775 | |
1509
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1494
diff
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776 for p in (p1, p2): |
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|
777 if not p in self.nodemap: |
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|
778 raise RevlogError(_("unknown parent %s") % short(p1)) |
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|
779 |
192 | 780 if not chain: |
781 # retrieve the parent revision of the delta chain | |
782 chain = p1 | |
783 if not chain in self.nodemap: | |
1402
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i18n part2: use '_' for all strings who are part of the user interface
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1400
diff
changeset
|
784 raise RevlogError(_("unknown base %s") % short(chain[:4])) |
46 | 785 |
786 # full versions are inserted when the needed deltas become | |
787 # comparable to the uncompressed text or when the previous | |
788 # version is not the one we have a delta against. We use | |
789 # the size of the previous full rev as a proxy for the | |
790 # current size. | |
791 | |
792 if chain == prev: | |
1533
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Reduce string duplication in compression code
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diff
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|
793 tempd = compress(delta) |
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|
794 cdelta = tempd[0] + tempd[1] |
46 | 795 |
796 if chain != prev or (end - start + len(cdelta)) > measure * 2: | |
797 # flush our writes here so we can read it in revision | |
798 dfh.flush() | |
799 ifh.flush() | |
65
d40cc5aacc31
Fix up a bunch of bugs in the new merge code
mpm@selenic.com
parents:
64
diff
changeset
|
800 text = self.revision(chain) |
73 | 801 text = self.patches(text, [delta]) |
46 | 802 chk = self.addrevision(text, transaction, link, p1, p2) |
803 if chk != node: | |
1402
9d2c2e6b32b5
i18n part2: use '_' for all strings who are part of the user interface
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1400
diff
changeset
|
804 raise RevlogError(_("consistency error adding group")) |
46 | 805 measure = len(text) |
806 else: | |
1749
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1711
diff
changeset
|
807 e = (end, len(cdelta), base, link, p1, p2, node) |
46 | 808 self.index.append(e) |
809 self.nodemap[node] = r | |
810 dfh.write(cdelta) | |
811 ifh.write(struct.pack(indexformat, *e)) | |
812 | |
65
d40cc5aacc31
Fix up a bunch of bugs in the new merge code
mpm@selenic.com
parents:
64
diff
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813 t, r, chain, prev = r, r + 1, node, node |
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814 base = self.base(t) |
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815 start = self.start(base) |
46 | 816 end = self.end(t) |
817 | |
818 dfh.close() | |
819 ifh.close() | |
820 return node | |
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821 |
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822 def strip(self, rev, minlink): |
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823 if self.count() == 0 or rev >= self.count(): |
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824 return |
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825 |
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826 # When stripping away a revision, we need to make sure it |
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827 # does not actually belong to an older changeset. |
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828 # The minlink parameter defines the oldest revision |
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829 # we're allowed to strip away. |
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830 while minlink > self.index[rev][3]: |
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831 rev += 1 |
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832 if rev >= self.count(): |
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833 return |
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834 |
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835 # first truncate the files on disk |
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836 end = self.start(rev) |
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837 self.opener(self.datafile, "a").truncate(end) |
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838 end = rev * struct.calcsize(indexformat) |
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839 self.opener(self.indexfile, "a").truncate(end) |
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840 |
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841 # then reset internal state in memory to forget those revisions |
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842 self.cache = None |
1711 | 843 self.chunkcache = None |
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844 for p in self.index[rev:]: |
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845 del self.nodemap[p[6]] |
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846 del self.index[rev:] |
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847 |
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848 # truncating the lazyindex also truncates the lazymap. |
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849 if isinstance(self.index, lazyindex): |
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850 self.index.trunc(end) |
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851 |
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852 |
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853 def checksize(self): |
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854 expected = 0 |
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855 if self.count(): |
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856 expected = self.end(self.count() - 1) |
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857 |
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858 try: |
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859 f = self.opener(self.datafile) |
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860 f.seek(0, 2) |
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861 actual = f.tell() |
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862 dd = actual - expected |
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863 except IOError, inst: |
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864 if inst.errno != errno.ENOENT: |
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865 raise |
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866 dd = 0 |
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867 |
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868 try: |
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869 f = self.opener(self.indexfile) |
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870 f.seek(0, 2) |
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871 actual = f.tell() |
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872 s = struct.calcsize(indexformat) |
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873 i = actual / s |
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874 di = actual - (i * s) |
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875 except IOError, inst: |
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876 if inst.errno != errno.ENOENT: |
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877 raise |
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878 di = 0 |
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879 |
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880 return (dd, di) |
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881 |
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882 |