Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/revlog.py @ 2061:5987c1eac2ce
support nested repositories.
mercurial will not recurse into a subdirectory that contains a .hg
directory. it is treated as a separate repository.
author | Vadim Gelfer <vadim.gelfer@gmail.com> |
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date | Fri, 31 Mar 2006 17:00:09 -0800 |
parents | 4aab906517c6 |
children | 74d3f5336b66 |
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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 changegroup errno heapq mdiff os") |
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17 demandload(globals(), "sha struct zlib") |
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18 |
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19 def hash(text, p1, p2): |
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20 """generate a hash from the given text and its parent hashes |
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21 |
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22 This hash combines both the current file contents and its history |
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23 in a manner that makes it easy to distinguish nodes with the same |
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24 content in the revision graph. |
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25 """ |
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26 l = [p1, p2] |
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27 l.sort() |
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28 s = sha.new(l[0]) |
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29 s.update(l[1]) |
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30 s.update(text) |
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31 return s.digest() |
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32 |
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33 def compress(text): |
1083 | 34 """ generate a possibly-compressed representation of text """ |
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35 if not text: return ("", text) |
112 | 36 if len(text) < 44: |
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37 if text[0] == '\0': return ("", text) |
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38 return ('u', text) |
112 | 39 bin = zlib.compress(text) |
40 if len(bin) > len(text): | |
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41 if text[0] == '\0': return ("", text) |
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42 return ('u', text) |
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43 return ("", bin) |
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44 |
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45 def decompress(bin): |
1083 | 46 """ decompress the given input """ |
112 | 47 if not bin: return bin |
48 t = bin[0] | |
49 if t == '\0': return bin | |
50 if t == 'x': return zlib.decompress(bin) | |
51 if t == 'u': return bin[1:] | |
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52 raise RevlogError(_("unknown compression type %r") % t) |
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53 |
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54 indexformat = ">4l20s20s20s" |
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55 |
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56 class lazyparser(object): |
1083 | 57 """ |
58 this class avoids the need to parse the entirety of large indices | |
59 | |
60 By default we parse and load 1000 entries at a time. | |
61 | |
62 If no position is specified, we load the whole index, and replace | |
63 the lazy objects in revlog with the underlying objects for | |
64 efficiency in cases where we look at most of the nodes. | |
65 """ | |
323 | 66 def __init__(self, data, revlog): |
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67 self.data = data |
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68 self.s = struct.calcsize(indexformat) |
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69 self.l = len(data)/self.s |
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70 self.index = [None] * self.l |
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71 self.map = {nullid: -1} |
323 | 72 self.all = 0 |
73 self.revlog = revlog | |
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74 |
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75 def trunc(self, pos): |
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76 self.l = pos/self.s |
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77 |
323 | 78 def load(self, pos=None): |
79 if self.all: return | |
80 if pos is not None: | |
81 block = pos / 1000 | |
82 i = block * 1000 | |
83 end = min(self.l, i + 1000) | |
84 else: | |
85 self.all = 1 | |
86 i = 0 | |
87 end = self.l | |
88 self.revlog.index = self.index | |
89 self.revlog.nodemap = self.map | |
515 | 90 |
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91 while i < end: |
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92 d = self.data[i * self.s: (i + 1) * self.s] |
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93 e = struct.unpack(indexformat, d) |
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94 self.index[i] = e |
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95 self.map[e[6]] = i |
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96 i += 1 |
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98 class lazyindex(object): |
1083 | 99 """a lazy version of the index array""" |
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100 def __init__(self, parser): |
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101 self.p = parser |
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102 def __len__(self): |
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103 return len(self.p.index) |
115 | 104 def load(self, pos): |
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105 if pos < 0: |
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106 pos += len(self.p.index) |
115 | 107 self.p.load(pos) |
108 return self.p.index[pos] | |
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109 def __getitem__(self, pos): |
115 | 110 return self.p.index[pos] or self.load(pos) |
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111 def __delitem__(self, pos): |
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112 del self.p.index[pos] |
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113 def append(self, e): |
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114 self.p.index.append(e) |
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115 def trunc(self, pos): |
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116 self.p.trunc(pos) |
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118 class lazymap(object): |
1083 | 119 """a lazy version of the node map""" |
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120 def __init__(self, parser): |
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121 self.p = parser |
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122 def load(self, key): |
323 | 123 if self.p.all: return |
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124 n = self.p.data.find(key) |
1214 | 125 if n < 0: |
126 raise KeyError(key) | |
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127 pos = n / self.p.s |
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128 self.p.load(pos) |
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129 def __contains__(self, key): |
323 | 130 self.p.load() |
131 return key in self.p.map | |
97 | 132 def __iter__(self): |
469 | 133 yield nullid |
97 | 134 for i in xrange(self.p.l): |
135 try: | |
136 yield self.p.index[i][6] | |
137 except: | |
138 self.p.load(i) | |
139 yield self.p.index[i][6] | |
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140 def __getitem__(self, key): |
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141 try: |
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142 return self.p.map[key] |
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143 except KeyError: |
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144 try: |
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145 self.load(key) |
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146 return self.p.map[key] |
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147 except KeyError: |
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148 raise KeyError("node " + hex(key)) |
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149 def __setitem__(self, key, val): |
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150 self.p.map[key] = val |
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151 def __delitem__(self, key): |
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152 del self.p.map[key] |
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153 |
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154 class RevlogError(Exception): pass |
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155 |
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156 class revlog(object): |
1083 | 157 """ |
158 the underlying revision storage object | |
159 | |
160 A revlog consists of two parts, an index and the revision data. | |
161 | |
162 The index is a file with a fixed record size containing | |
163 information on each revision, includings its nodeid (hash), the | |
164 nodeids of its parents, the position and offset of its data within | |
165 the data file, and the revision it's based on. Finally, each entry | |
166 contains a linkrev entry that can serve as a pointer to external | |
167 data. | |
168 | |
169 The revision data itself is a linear collection of data chunks. | |
170 Each chunk represents a revision and is usually represented as a | |
171 delta against the previous chunk. To bound lookup time, runs of | |
172 deltas are limited to about 2 times the length of the original | |
173 version data. This makes retrieval of a version proportional to | |
174 its size, or O(1) relative to the number of revisions. | |
175 | |
176 Both pieces of the revlog are written to in an append-only | |
177 fashion, which means we never need to rewrite a file to insert or | |
178 remove data, and can use some simple techniques to avoid the need | |
179 for locking while reading. | |
180 """ | |
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181 def __init__(self, opener, indexfile, datafile): |
1083 | 182 """ |
183 create a revlog object | |
184 | |
185 opener is a function that abstracts the file opening operation | |
186 and can be used to implement COW semantics or the like. | |
187 """ | |
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188 self.indexfile = indexfile |
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189 self.datafile = datafile |
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190 self.opener = opener |
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191 |
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192 self.indexstat = None |
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193 self.cache = None |
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194 self.chunkcache = None |
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195 self.load() |
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196 |
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197 def load(self): |
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198 try: |
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199 f = self.opener(self.indexfile) |
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200 except IOError, inst: |
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201 if inst.errno != errno.ENOENT: |
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202 raise |
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203 i = "" |
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204 else: |
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205 try: |
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206 st = os.fstat(f.fileno()) |
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207 except AttributeError, inst: |
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208 st = None |
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209 else: |
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210 oldst = self.indexstat |
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211 if (oldst and st.st_dev == oldst.st_dev |
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212 and st.st_ino == oldst.st_ino |
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213 and st.st_mtime == oldst.st_mtime |
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214 and st.st_ctime == oldst.st_ctime): |
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215 return |
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216 self.indexstat = st |
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217 i = f.read() |
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218 |
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219 if i and i[:4] != "\0\0\0\0": |
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220 raise RevlogError(_("incompatible revlog signature on %s") % |
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221 self.indexfile) |
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222 |
116
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223 if len(i) > 10000: |
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224 # big index, let's parse it on demand |
323 | 225 parser = lazyparser(i, self) |
116
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226 self.index = lazyindex(parser) |
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227 self.nodemap = lazymap(parser) |
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228 else: |
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229 s = struct.calcsize(indexformat) |
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230 l = len(i) / s |
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231 self.index = [None] * l |
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232 m = [None] * l |
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233 |
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234 n = 0 |
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235 for f in xrange(0, l * s, s): |
116
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236 # offset, size, base, linkrev, p1, p2, nodeid |
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237 e = struct.unpack(indexformat, i[f:f + s]) |
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238 m[n] = (e[6], n) |
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239 self.index[n] = e |
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240 n += 1 |
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241 |
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242 self.nodemap = dict(m) |
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243 self.nodemap[nullid] = -1 |
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244 |
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245 def tip(self): return self.node(len(self.index) - 1) |
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246 def count(self): return len(self.index) |
26 | 247 def node(self, rev): return (rev < 0) and nullid or self.index[rev][6] |
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248 def rev(self, node): |
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249 try: |
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250 return self.nodemap[node] |
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251 except KeyError: |
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252 raise RevlogError(_('%s: no node %s') % (self.indexfile, hex(node))) |
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253 def linkrev(self, node): return self.index[self.rev(node)][3] |
2 | 254 def parents(self, node): |
255 if node == nullid: return (nullid, nullid) | |
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256 return self.index[self.rev(node)][4:6] |
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257 |
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258 def start(self, rev): return (rev < 0) and -1 or self.index[rev][0] |
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259 def length(self, rev): |
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260 if rev < 0: |
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261 return 0 |
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262 else: |
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263 return self.index[rev][1] |
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264 def end(self, rev): return self.start(rev) + self.length(rev) |
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265 def base(self, rev): return (rev < 0) and rev or self.index[rev][2] |
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266 |
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267 def reachable(self, rev, stop=None): |
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268 reachable = {} |
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269 visit = [rev] |
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270 reachable[rev] = 1 |
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271 if stop: |
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272 stopn = self.rev(stop) |
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273 else: |
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274 stopn = 0 |
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275 while visit: |
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276 n = visit.pop(0) |
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277 if n == stop: |
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278 continue |
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279 if n == nullid: |
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280 continue |
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281 for p in self.parents(n): |
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282 if self.rev(p) < stopn: |
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283 continue |
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284 if p not in reachable: |
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285 reachable[p] = 1 |
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286 visit.append(p) |
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287 return reachable |
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288 |
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289 def nodesbetween(self, roots=None, heads=None): |
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290 """Return a tuple containing three elements. Elements 1 and 2 contain |
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291 a final list bases and heads after all the unreachable ones have been |
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292 pruned. Element 0 contains a topologically sorted list of all |
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293 |
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294 nodes that satisfy these constraints: |
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295 1. All nodes must be descended from a node in roots (the nodes on |
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296 roots are considered descended from themselves). |
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297 2. All nodes must also be ancestors of a node in heads (the nodes in |
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298 heads are considered to be their own ancestors). |
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299 |
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300 If roots is unspecified, nullid is assumed as the only root. |
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301 If heads is unspecified, it is taken to be the output of the |
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302 heads method (i.e. a list of all nodes in the repository that |
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303 have no children).""" |
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304 nonodes = ([], [], []) |
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305 if roots is not None: |
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306 roots = list(roots) |
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307 if not roots: |
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308 return nonodes |
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309 lowestrev = min([self.rev(n) for n in roots]) |
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310 else: |
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311 roots = [nullid] # Everybody's a descendent of nullid |
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312 lowestrev = -1 |
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313 if (lowestrev == -1) and (heads is None): |
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314 # We want _all_ the nodes! |
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315 return ([self.node(r) for r in xrange(0, self.count())], |
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316 [nullid], list(self.heads())) |
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317 if heads is None: |
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318 # All nodes are ancestors, so the latest ancestor is the last |
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319 # node. |
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320 highestrev = self.count() - 1 |
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321 # Set ancestors to None to signal that every node is an ancestor. |
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322 ancestors = None |
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323 # Set heads to an empty dictionary for later discovery of heads |
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324 heads = {} |
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325 else: |
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326 heads = list(heads) |
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327 if not heads: |
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328 return nonodes |
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329 ancestors = {} |
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330 # Start at the top and keep marking parents until we're done. |
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331 nodestotag = heads[:] |
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332 # Turn heads into a dictionary so we can remove 'fake' heads. |
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333 # Also, later we will be using it to filter out the heads we can't |
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334 # find from roots. |
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335 heads = dict.fromkeys(heads, 0) |
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336 # Remember where the top was so we can use it as a limit later. |
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337 highestrev = max([self.rev(n) for n in nodestotag]) |
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338 while nodestotag: |
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339 # grab a node to tag |
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340 n = nodestotag.pop() |
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341 # Never tag nullid |
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342 if n == nullid: |
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343 continue |
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344 # A node's revision number represents its place in a |
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345 # topologically sorted list of nodes. |
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346 r = self.rev(n) |
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347 if r >= lowestrev: |
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348 if n not in ancestors: |
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349 # If we are possibly a descendent of one of the roots |
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350 # and we haven't already been marked as an ancestor |
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351 ancestors[n] = 1 # Mark as ancestor |
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352 # Add non-nullid parents to list of nodes to tag. |
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353 nodestotag.extend([p for p in self.parents(n) if |
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354 p != nullid]) |
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355 elif n in heads: # We've seen it before, is it a fake head? |
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356 # So it is, real heads should not be the ancestors of |
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357 # any other heads. |
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358 heads.pop(n) |
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359 if not ancestors: |
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360 return nonodes |
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361 # Now that we have our set of ancestors, we want to remove any |
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362 # roots that are not ancestors. |
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363 |
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364 # If one of the roots was nullid, everything is included anyway. |
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365 if lowestrev > -1: |
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366 # But, since we weren't, let's recompute the lowest rev to not |
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367 # include roots that aren't ancestors. |
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368 |
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369 # Filter out roots that aren't ancestors of heads |
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370 roots = [n for n in roots if n in ancestors] |
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371 # Recompute the lowest revision |
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372 if roots: |
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373 lowestrev = min([self.rev(n) for n in roots]) |
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374 else: |
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375 # No more roots? Return empty list |
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376 return nonodes |
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377 else: |
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378 # We are descending from nullid, and don't need to care about |
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379 # any other roots. |
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380 lowestrev = -1 |
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381 roots = [nullid] |
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382 # Transform our roots list into a 'set' (i.e. a dictionary where the |
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383 # values don't matter. |
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384 descendents = dict.fromkeys(roots, 1) |
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385 # Also, keep the original roots so we can filter out roots that aren't |
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386 # 'real' roots (i.e. are descended from other roots). |
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387 roots = descendents.copy() |
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388 # Our topologically sorted list of output nodes. |
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389 orderedout = [] |
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390 # Don't start at nullid since we don't want nullid in our output list, |
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391 # and if nullid shows up in descedents, empty parents will look like |
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392 # they're descendents. |
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393 for r in xrange(max(lowestrev, 0), highestrev + 1): |
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394 n = self.node(r) |
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395 isdescendent = False |
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396 if lowestrev == -1: # Everybody is a descendent of nullid |
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397 isdescendent = True |
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398 elif n in descendents: |
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399 # n is already a descendent |
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400 isdescendent = True |
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401 # This check only needs to be done here because all the roots |
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402 # will start being marked is descendents before the loop. |
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403 if n in roots: |
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404 # If n was a root, check if it's a 'real' root. |
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405 p = tuple(self.parents(n)) |
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406 # If any of its parents are descendents, it's not a root. |
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407 if (p[0] in descendents) or (p[1] in descendents): |
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408 roots.pop(n) |
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409 else: |
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410 p = tuple(self.parents(n)) |
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411 # A node is a descendent if either of its parents are |
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412 # descendents. (We seeded the dependents list with the roots |
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413 # up there, remember?) |
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414 if (p[0] in descendents) or (p[1] in descendents): |
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415 descendents[n] = 1 |
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416 isdescendent = True |
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417 if isdescendent and ((ancestors is None) or (n in ancestors)): |
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418 # Only include nodes that are both descendents and ancestors. |
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419 orderedout.append(n) |
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420 if (ancestors is not None) and (n in heads): |
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421 # We're trying to figure out which heads are reachable |
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422 # from roots. |
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423 # Mark this head as having been reached |
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424 heads[n] = 1 |
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425 elif ancestors is None: |
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426 # Otherwise, we're trying to discover the heads. |
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427 # Assume this is a head because if it isn't, the next step |
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428 # will eventually remove it. |
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429 heads[n] = 1 |
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430 # But, obviously its parents aren't. |
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431 for p in self.parents(n): |
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432 heads.pop(p, None) |
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433 heads = [n for n in heads.iterkeys() if heads[n] != 0] |
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434 roots = roots.keys() |
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435 assert orderedout |
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436 assert roots |
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437 assert heads |
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438 return (orderedout, roots, heads) |
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439 |
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440 def heads(self, start=None): |
1550
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441 """return the list of all nodes that have no children |
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442 |
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443 if start is specified, only heads that are descendants of |
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444 start will be returned |
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445 |
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446 """ |
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447 if start is None: |
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448 start = nullid |
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449 reachable = {start: 1} |
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450 heads = {start: 1} |
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451 startrev = self.rev(start) |
1083 | 452 |
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453 for r in xrange(startrev + 1, self.count()): |
221 | 454 n = self.node(r) |
455 for pn in self.parents(n): | |
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456 if pn in reachable: |
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457 reachable[n] = 1 |
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458 heads[n] = 1 |
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459 if pn in heads: |
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460 del heads[pn] |
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461 return heads.keys() |
370 | 462 |
463 def children(self, node): | |
1083 | 464 """find the children of a given node""" |
370 | 465 c = [] |
466 p = self.rev(node) | |
467 for r in range(p + 1, self.count()): | |
468 n = self.node(r) | |
469 for pn in self.parents(n): | |
854
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470 if pn == node: |
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471 c.append(n) |
370 | 472 continue |
473 elif pn == nullid: | |
474 continue | |
475 return c | |
515 | 476 |
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477 def lookup(self, id): |
1083 | 478 """locate a node based on revision number or subset of hex nodeid""" |
36
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479 try: |
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480 rev = int(id) |
469 | 481 if str(rev) != id: raise ValueError |
482 if rev < 0: rev = self.count() + rev | |
476
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483 if rev < 0 or rev >= self.count(): raise ValueError |
36
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484 return self.node(rev) |
469 | 485 except (ValueError, OverflowError): |
36
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486 c = [] |
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487 for n in self.nodemap: |
469 | 488 if hex(n).startswith(id): |
36
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489 c.append(n) |
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490 if len(c) > 1: raise RevlogError(_("Ambiguous identifier")) |
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491 if len(c) < 1: raise RevlogError(_("No match found")) |
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492 return c[0] |
515 | 493 |
36
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494 return None |
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495 |
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496 def diff(self, a, b): |
1083 | 497 """return a delta between two revisions""" |
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498 return mdiff.textdiff(a, b) |
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499 |
73 | 500 def patches(self, t, pl): |
1083 | 501 """apply a list of patches to a string""" |
73 | 502 return mdiff.patches(t, pl) |
503 | |
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504 def chunk(self, rev): |
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505 start, length = self.start(rev), self.length(rev) |
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506 end = start + length |
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507 |
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508 def loadcache(): |
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509 cache_length = max(4096 * 1024, length) # 4Mo |
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510 df = self.opener(self.datafile) |
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511 df.seek(start) |
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512 self.chunkcache = (start, df.read(cache_length)) |
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513 |
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514 if not self.chunkcache: |
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515 loadcache() |
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516 |
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517 cache_start = self.chunkcache[0] |
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518 cache_end = cache_start + len(self.chunkcache[1]) |
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519 if start >= cache_start and end <= cache_end: |
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520 # it is cached |
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521 offset = start - cache_start |
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522 else: |
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523 loadcache() |
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524 offset = 0 |
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525 |
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526 #def checkchunk(): |
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527 # df = self.opener(self.datafile) |
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528 # df.seek(start) |
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529 # return df.read(length) |
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530 #assert s == checkchunk() |
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531 return decompress(self.chunkcache[1][offset:offset + length]) |
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532 |
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533 def delta(self, node): |
1083 | 534 """return or calculate a delta between a node and its predecessor""" |
119
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535 r = self.rev(node) |
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536 return self.revdiff(r - 1, r) |
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537 |
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538 def revdiff(self, rev1, rev2): |
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539 """return or calculate a delta between two revisions""" |
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540 b1 = self.base(rev1) |
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541 b2 = self.base(rev2) |
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542 if b1 == b2 and rev1 + 1 == rev2: |
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543 return self.chunk(rev2) |
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544 else: |
1941
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545 return self.diff(self.revision(self.node(rev1)), |
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546 self.revision(self.node(rev2))) |
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547 |
0
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548 def revision(self, node): |
1083 | 549 """return an uncompressed revision of a given""" |
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550 if node == nullid: return "" |
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551 if self.cache and self.cache[0] == node: return self.cache[2] |
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552 |
1083 | 553 # look up what we need to read |
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554 text = None |
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555 rev = self.rev(node) |
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556 base = self.base(rev) |
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557 |
1083 | 558 # do we have useful data cached? |
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559 if self.cache and self.cache[1] >= base and self.cache[1] < rev: |
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560 base = self.cache[1] |
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561 text = self.cache[2] |
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562 else: |
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563 text = self.chunk(base) |
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564 |
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565 bins = [] |
64 | 566 for r in xrange(base + 1, rev + 1): |
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567 bins.append(self.chunk(r)) |
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568 |
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569 text = self.patches(text, bins) |
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570 |
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571 p1, p2 = self.parents(node) |
26 | 572 if node != hash(text, p1, p2): |
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573 raise RevlogError(_("integrity check failed on %s:%d") |
98 | 574 % (self.datafile, rev)) |
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575 |
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576 self.cache = (node, rev, text) |
515 | 577 return text |
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578 |
644 | 579 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
1083 | 580 """add a revision to the log |
581 | |
582 text - the revision data to add | |
583 transaction - the transaction object used for rollback | |
584 link - the linkrev data to add | |
585 p1, p2 - the parent nodeids of the revision | |
586 d - an optional precomputed delta | |
587 """ | |
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588 if text is None: text = "" |
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589 if p1 is None: p1 = self.tip() |
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590 if p2 is None: p2 = nullid |
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591 |
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592 node = hash(text, p1, p2) |
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593 |
301 | 594 if node in self.nodemap: |
595 return node | |
596 | |
0
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597 n = self.count() |
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598 t = n - 1 |
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599 |
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600 if n: |
64 | 601 base = self.base(t) |
602 start = self.start(base) | |
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603 end = self.end(t) |
644 | 604 if not d: |
605 prev = self.revision(self.tip()) | |
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606 d = self.diff(prev, str(text)) |
98 | 607 data = compress(d) |
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608 l = len(data[1]) + len(data[0]) |
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609 dist = end - start + l |
0
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610 |
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611 # full versions are inserted when the needed deltas |
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612 # become comparable to the uncompressed text |
64 | 613 if not n or dist > len(text) * 2: |
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614 data = compress(text) |
1533
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615 l = len(data[1]) + len(data[0]) |
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616 base = n |
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617 else: |
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618 base = self.base(t) |
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619 |
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620 offset = 0 |
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621 if t >= 0: |
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622 offset = self.end(t) |
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623 |
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624 e = (offset, l, base, link, p1, p2, node) |
515 | 625 |
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626 self.index.append(e) |
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627 self.nodemap[node] = n |
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628 entry = struct.pack(indexformat, *e) |
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629 |
26 | 630 transaction.add(self.datafile, e[0]) |
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631 f = self.opener(self.datafile, "a") |
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632 if data[0]: |
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633 f.write(data[0]) |
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634 f.write(data[1]) |
41 | 635 transaction.add(self.indexfile, n * len(entry)) |
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636 self.opener(self.indexfile, "a").write(entry) |
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637 |
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638 self.cache = (node, n, text) |
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639 return node |
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640 |
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641 def ancestor(self, a, b): |
1083 | 642 """calculate the least common ancestor of nodes a and b""" |
147 | 643 # calculate the distance of every node from root |
644 dist = {nullid: 0} | |
645 for i in xrange(self.count()): | |
646 n = self.node(i) | |
647 p1, p2 = self.parents(n) | |
648 dist[n] = max(dist[p1], dist[p2]) + 1 | |
515 | 649 |
147 | 650 # traverse ancestors in order of decreasing distance from root |
651 def ancestors(node): | |
652 # we store negative distances because heap returns smallest member | |
653 h = [(-dist[node], node)] | |
654 seen = {} | |
655 while h: | |
656 d, n = heapq.heappop(h) | |
657 if n not in seen: | |
658 seen[n] = 1 | |
1351
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659 yield (-d, n) |
147 | 660 for p in self.parents(n): |
661 heapq.heappush(h, (-dist[p], p)) | |
45
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662 |
1351
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663 def generations(node): |
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664 sg, s = None, {} |
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665 for g,n in ancestors(node): |
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666 if g != sg: |
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667 if sg: |
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668 yield sg, s |
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669 sg, s = g, {n:1} |
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670 else: |
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671 s[n] = 1 |
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672 yield sg, s |
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673 |
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674 x = generations(a) |
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675 y = generations(b) |
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676 gx = x.next() |
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677 gy = y.next() |
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678 |
147 | 679 # increment each ancestor list until it is closer to root than |
680 # the other, or they match | |
681 while 1: | |
1351
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682 #print "ancestor gen %s %s" % (gx[0], gy[0]) |
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683 if gx[0] == gy[0]: |
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684 # find the intersection |
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685 i = [ n for n in gx[1] if n in gy[1] ] |
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686 if i: |
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687 return i[0] |
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688 else: |
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689 #print "next" |
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690 gy = y.next() |
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691 gx = x.next() |
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692 elif gx[0] < gy[0]: |
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693 #print "next y" |
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694 gy = y.next() |
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695 else: |
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696 #print "next x" |
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697 gx = x.next() |
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698 |
1598
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699 def group(self, nodelist, lookup, infocollect=None): |
1083 | 700 """calculate a delta group |
46 | 701 |
1083 | 702 Given a list of changeset revs, return a set of deltas and |
703 metadata corresponding to nodes. the first delta is | |
704 parent(nodes[0]) -> nodes[0] the receiver is guaranteed to | |
705 have this parent as it has all history before these | |
706 changesets. parent is parent[0] | |
707 """ | |
1458
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708 revs = [self.rev(n) for n in nodelist] |
46 | 709 |
710 # if we don't have any revisions touched by these changesets, bail | |
192 | 711 if not revs: |
1981
736b6c96bbbc
make incoming work via ssh (issue139); move chunk code into separate module.
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712 yield changegroup.closechunk() |
192 | 713 return |
46 | 714 |
715 # add the parent of the first rev | |
716 p = self.parents(self.node(revs[0]))[0] | |
717 revs.insert(0, self.rev(p)) | |
718 | |
719 # build deltas | |
71
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720 for d in xrange(0, len(revs) - 1): |
46 | 721 a, b = revs[d], revs[d + 1] |
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722 nb = self.node(b) |
192 | 723 |
1458
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724 if infocollect is not None: |
1598
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725 infocollect(nb) |
1458
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726 |
1941
7518823709a2
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727 d = self.revdiff(a, b) |
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728 p = self.parents(nb) |
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729 meta = nb + p[0] + p[1] + lookup(nb) |
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730 yield changegroup.genchunk("%s%s" % (meta, d)) |
46 | 731 |
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732 yield changegroup.closechunk() |
192 | 733 |
1062 | 734 def addgroup(self, revs, linkmapper, transaction, unique=0): |
1083 | 735 """ |
736 add a delta group | |
46 | 737 |
1083 | 738 given a set of deltas, add them to the revision log. the |
739 first delta is against its parent, which should be in our | |
740 log, the rest are against the previous delta. | |
741 """ | |
742 | |
743 #track the base of the current delta log | |
46 | 744 r = self.count() |
745 t = r - 1 | |
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746 node = None |
515 | 747 |
655 | 748 base = prev = -1 |
653
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749 start = end = measure = 0 |
46 | 750 if r: |
1749
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751 base = self.base(t) |
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752 start = self.start(base) |
46 | 753 end = self.end(t) |
1749
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754 measure = self.length(base) |
46 | 755 prev = self.tip() |
756 | |
757 transaction.add(self.datafile, end) | |
758 transaction.add(self.indexfile, r * struct.calcsize(indexformat)) | |
759 dfh = self.opener(self.datafile, "a") | |
760 ifh = self.opener(self.indexfile, "a") | |
761 | |
762 # loop through our set of deltas | |
192 | 763 chain = None |
764 for chunk in revs: | |
765 node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) | |
94 | 766 link = linkmapper(cs) |
77 | 767 if node in self.nodemap: |
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768 # this can happen if two branches make the same change |
1218
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769 # if unique: |
1402
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770 # raise RevlogError(_("already have %s") % hex(node[:4])) |
653
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771 chain = node |
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772 continue |
192 | 773 delta = chunk[80:] |
774 | |
1509
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775 for p in (p1, p2): |
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776 if not p in self.nodemap: |
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777 raise RevlogError(_("unknown parent %s") % short(p1)) |
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778 |
192 | 779 if not chain: |
780 # retrieve the parent revision of the delta chain | |
781 chain = p1 | |
782 if not chain in self.nodemap: | |
1402
9d2c2e6b32b5
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diff
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|
783 raise RevlogError(_("unknown base %s") % short(chain[:4])) |
46 | 784 |
785 # full versions are inserted when the needed deltas become | |
786 # comparable to the uncompressed text or when the previous | |
787 # version is not the one we have a delta against. We use | |
788 # the size of the previous full rev as a proxy for the | |
789 # current size. | |
790 | |
791 if chain == prev: | |
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792 tempd = compress(delta) |
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793 cdelta = tempd[0] + tempd[1] |
46 | 794 |
795 if chain != prev or (end - start + len(cdelta)) > measure * 2: | |
796 # flush our writes here so we can read it in revision | |
797 dfh.flush() | |
798 ifh.flush() | |
65
d40cc5aacc31
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799 text = self.revision(chain) |
73 | 800 text = self.patches(text, [delta]) |
46 | 801 chk = self.addrevision(text, transaction, link, p1, p2) |
802 if chk != node: | |
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803 raise RevlogError(_("consistency error adding group")) |
46 | 804 measure = len(text) |
805 else: | |
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806 e = (end, len(cdelta), base, link, p1, p2, node) |
46 | 807 self.index.append(e) |
808 self.nodemap[node] = r | |
809 dfh.write(cdelta) | |
810 ifh.write(struct.pack(indexformat, *e)) | |
811 | |
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parents:
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diff
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812 t, r, chain, prev = r, r + 1, node, node |
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
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813 base = self.base(t) |
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814 start = self.start(base) |
46 | 815 end = self.end(t) |
816 | |
817 dfh.close() | |
818 ifh.close() | |
2002
4aab906517c6
Calling revlog.addgroup with an empty changegroup now raises RevlogError.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
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819 if node is None: |
4aab906517c6
Calling revlog.addgroup with an empty changegroup now raises RevlogError.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
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|
820 raise RevlogError(_("group to be added is empty")) |
46 | 821 return node |
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parents:
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822 |
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mason@suse.com
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823 def strip(self, rev, minlink): |
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824 if self.count() == 0 or rev >= self.count(): |
7ae0ce7a3dc4
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825 return |
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826 |
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827 # When stripping away a revision, we need to make sure it |
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828 # does not actually belong to an older changeset. |
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829 # The minlink parameter defines the oldest revision |
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830 # we're allowed to strip away. |
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831 while minlink > self.index[rev][3]: |
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832 rev += 1 |
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833 if rev >= self.count(): |
7ae0ce7a3dc4
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834 return |
7ae0ce7a3dc4
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835 |
7ae0ce7a3dc4
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836 # first truncate the files on disk |
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837 end = self.start(rev) |
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838 self.opener(self.datafile, "a").truncate(end) |
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839 end = rev * struct.calcsize(indexformat) |
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840 self.opener(self.indexfile, "a").truncate(end) |
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841 |
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842 # then reset internal state in memory to forget those revisions |
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843 self.cache = None |
1711 | 844 self.chunkcache = None |
1535
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845 for p in self.index[rev:]: |
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846 del self.nodemap[p[6]] |
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847 del self.index[rev:] |
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848 |
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849 # truncating the lazyindex also truncates the lazymap. |
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850 if isinstance(self.index, lazyindex): |
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851 self.index.trunc(end) |
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changeset
|
852 |
7ae0ce7a3dc4
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853 |
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854 def checksize(self): |
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855 expected = 0 |
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856 if self.count(): |
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857 expected = self.end(self.count() - 1) |
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858 |
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859 try: |
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860 f = self.opener(self.datafile) |
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861 f.seek(0, 2) |
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862 actual = f.tell() |
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863 dd = actual - expected |
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864 except IOError, inst: |
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865 if inst.errno != errno.ENOENT: |
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866 raise |
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867 dd = 0 |
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868 |
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869 try: |
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870 f = self.opener(self.indexfile) |
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871 f.seek(0, 2) |
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872 actual = f.tell() |
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873 s = struct.calcsize(indexformat) |
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874 i = actual / s |
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875 di = actual - (i * s) |
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876 except IOError, inst: |
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877 if inst.errno != errno.ENOENT: |
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878 raise |
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879 di = 0 |
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880 |
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Matt Mackall <mpm@selenic.com>
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881 return (dd, di) |
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882 |
249ca10d37f4
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883 |