Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/revlog.py @ 1974:0d54675cd566
Delete bundle file of hg incoming in case of errors, preserve existing files.
Let write_bundle always create the bundle file, check if target doesn't exist
and delete it in case of errors.
This way incoming only has to delete the bundle file if it was meant to
be a temporary file.
author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Sat, 18 Mar 2006 14:36:45 +0100 |
parents | 7518823709a2 |
children | 736b6c96bbbc |
rev | line source |
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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 %r") % 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 (rev < 0) and -1 or self.index[rev][0] |
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258 def length(self, rev): |
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259 if rev < 0: |
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260 return 0 |
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261 else: |
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262 return self.index[rev][1] |
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263 def end(self, rev): return self.start(rev) + self.length(rev) |
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264 def base(self, rev): return (rev < 0) and rev or self.index[rev][2] |
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265 |
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266 def reachable(self, rev, stop=None): |
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267 reachable = {} |
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268 visit = [rev] |
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269 reachable[rev] = 1 |
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270 if stop: |
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271 stopn = self.rev(stop) |
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272 else: |
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273 stopn = 0 |
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274 while visit: |
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275 n = visit.pop(0) |
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276 if n == stop: |
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277 continue |
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278 if n == nullid: |
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279 continue |
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280 for p in self.parents(n): |
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281 if self.rev(p) < stopn: |
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282 continue |
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283 if p not in reachable: |
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284 reachable[p] = 1 |
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285 visit.append(p) |
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286 return reachable |
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287 |
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288 def nodesbetween(self, roots=None, heads=None): |
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289 """Return a tuple containing three elements. Elements 1 and 2 contain |
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290 a final list bases and heads after all the unreachable ones have been |
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291 pruned. Element 0 contains a topologically sorted list of all |
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292 |
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293 nodes that satisfy these constraints: |
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294 1. All nodes must be descended from a node in roots (the nodes on |
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295 roots are considered descended from themselves). |
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296 2. All nodes must also be ancestors of a node in heads (the nodes in |
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297 heads are considered to be their own ancestors). |
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298 |
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299 If roots is unspecified, nullid is assumed as the only root. |
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300 If heads is unspecified, it is taken to be the output of the |
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301 heads method (i.e. a list of all nodes in the repository that |
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302 have no children).""" |
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303 nonodes = ([], [], []) |
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304 if roots is not None: |
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305 roots = list(roots) |
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306 if not roots: |
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307 return nonodes |
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308 lowestrev = min([self.rev(n) for n in roots]) |
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309 else: |
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310 roots = [nullid] # Everybody's a descendent of nullid |
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311 lowestrev = -1 |
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312 if (lowestrev == -1) and (heads is None): |
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313 # We want _all_ the nodes! |
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314 return ([self.node(r) for r in xrange(0, self.count())], |
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315 [nullid], list(self.heads())) |
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316 if heads is None: |
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317 # All nodes are ancestors, so the latest ancestor is the last |
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318 # node. |
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319 highestrev = self.count() - 1 |
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320 # Set ancestors to None to signal that every node is an ancestor. |
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321 ancestors = None |
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322 # Set heads to an empty dictionary for later discovery of heads |
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323 heads = {} |
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324 else: |
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325 heads = list(heads) |
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326 if not heads: |
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327 return nonodes |
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328 ancestors = {} |
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329 # Start at the top and keep marking parents until we're done. |
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330 nodestotag = heads[:] |
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331 # Turn heads into a dictionary so we can remove 'fake' heads. |
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332 # Also, later we will be using it to filter out the heads we can't |
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333 # find from roots. |
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334 heads = dict.fromkeys(heads, 0) |
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335 # Remember where the top was so we can use it as a limit later. |
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336 highestrev = max([self.rev(n) for n in nodestotag]) |
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337 while nodestotag: |
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338 # grab a node to tag |
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339 n = nodestotag.pop() |
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340 # Never tag nullid |
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341 if n == nullid: |
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342 continue |
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343 # A node's revision number represents its place in a |
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344 # topologically sorted list of nodes. |
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345 r = self.rev(n) |
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346 if r >= lowestrev: |
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347 if n not in ancestors: |
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348 # If we are possibly a descendent of one of the roots |
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349 # and we haven't already been marked as an ancestor |
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350 ancestors[n] = 1 # Mark as ancestor |
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351 # Add non-nullid parents to list of nodes to tag. |
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352 nodestotag.extend([p for p in self.parents(n) if |
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353 p != nullid]) |
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354 elif n in heads: # We've seen it before, is it a fake head? |
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355 # So it is, real heads should not be the ancestors of |
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356 # any other heads. |
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357 heads.pop(n) |
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358 if not ancestors: |
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359 return nonodes |
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360 # Now that we have our set of ancestors, we want to remove any |
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361 # roots that are not ancestors. |
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362 |
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363 # If one of the roots was nullid, everything is included anyway. |
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364 if lowestrev > -1: |
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365 # But, since we weren't, let's recompute the lowest rev to not |
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366 # include roots that aren't ancestors. |
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367 |
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368 # Filter out roots that aren't ancestors of heads |
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369 roots = [n for n in roots if n in ancestors] |
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370 # Recompute the lowest revision |
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371 if roots: |
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372 lowestrev = min([self.rev(n) for n in roots]) |
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373 else: |
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374 # No more roots? Return empty list |
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375 return nonodes |
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376 else: |
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377 # We are descending from nullid, and don't need to care about |
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378 # any other roots. |
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379 lowestrev = -1 |
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380 roots = [nullid] |
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381 # Transform our roots list into a 'set' (i.e. a dictionary where the |
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382 # values don't matter. |
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383 descendents = dict.fromkeys(roots, 1) |
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384 # Also, keep the original roots so we can filter out roots that aren't |
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385 # 'real' roots (i.e. are descended from other roots). |
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386 roots = descendents.copy() |
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387 # Our topologically sorted list of output nodes. |
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388 orderedout = [] |
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389 # Don't start at nullid since we don't want nullid in our output list, |
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390 # and if nullid shows up in descedents, empty parents will look like |
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391 # they're descendents. |
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392 for r in xrange(max(lowestrev, 0), highestrev + 1): |
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393 n = self.node(r) |
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394 isdescendent = False |
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395 if lowestrev == -1: # Everybody is a descendent of nullid |
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396 isdescendent = True |
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397 elif n in descendents: |
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398 # n is already a descendent |
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399 isdescendent = True |
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400 # This check only needs to be done here because all the roots |
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401 # will start being marked is descendents before the loop. |
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402 if n in roots: |
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403 # If n was a root, check if it's a 'real' root. |
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404 p = tuple(self.parents(n)) |
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405 # If any of its parents are descendents, it's not a root. |
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406 if (p[0] in descendents) or (p[1] in descendents): |
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407 roots.pop(n) |
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408 else: |
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409 p = tuple(self.parents(n)) |
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410 # A node is a descendent if either of its parents are |
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411 # descendents. (We seeded the dependents list with the roots |
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412 # up there, remember?) |
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413 if (p[0] in descendents) or (p[1] in descendents): |
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414 descendents[n] = 1 |
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415 isdescendent = True |
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416 if isdescendent and ((ancestors is None) or (n in ancestors)): |
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417 # Only include nodes that are both descendents and ancestors. |
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418 orderedout.append(n) |
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419 if (ancestors is not None) and (n in heads): |
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420 # We're trying to figure out which heads are reachable |
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421 # from roots. |
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422 # Mark this head as having been reached |
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423 heads[n] = 1 |
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424 elif ancestors is None: |
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425 # Otherwise, we're trying to discover the heads. |
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426 # Assume this is a head because if it isn't, the next step |
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427 # will eventually remove it. |
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428 heads[n] = 1 |
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429 # But, obviously its parents aren't. |
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430 for p in self.parents(n): |
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431 heads.pop(p, None) |
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432 heads = [n for n in heads.iterkeys() if heads[n] != 0] |
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433 roots = roots.keys() |
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434 assert orderedout |
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435 assert roots |
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436 assert heads |
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|
437 return (orderedout, roots, heads) |
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438 |
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439 def heads(self, start=None): |
1550
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440 """return the list of all nodes that have no children |
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441 |
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442 if start is specified, only heads that are descendants of |
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443 start will be returned |
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444 |
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445 """ |
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446 if start is None: |
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447 start = nullid |
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448 reachable = {start: 1} |
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449 heads = {start: 1} |
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450 startrev = self.rev(start) |
1083 | 451 |
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452 for r in xrange(startrev + 1, self.count()): |
221 | 453 n = self.node(r) |
454 for pn in self.parents(n): | |
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455 if pn in reachable: |
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456 reachable[n] = 1 |
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457 heads[n] = 1 |
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458 if pn in heads: |
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459 del heads[pn] |
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460 return heads.keys() |
370 | 461 |
462 def children(self, node): | |
1083 | 463 """find the children of a given node""" |
370 | 464 c = [] |
465 p = self.rev(node) | |
466 for r in range(p + 1, self.count()): | |
467 n = self.node(r) | |
468 for pn in self.parents(n): | |
854
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469 if pn == node: |
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470 c.append(n) |
370 | 471 continue |
472 elif pn == nullid: | |
473 continue | |
474 return c | |
515 | 475 |
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476 def lookup(self, id): |
1083 | 477 """locate a node based on revision number or subset of hex nodeid""" |
36
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478 try: |
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479 rev = int(id) |
469 | 480 if str(rev) != id: raise ValueError |
481 if rev < 0: rev = self.count() + rev | |
476
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482 if rev < 0 or rev >= self.count(): raise ValueError |
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483 return self.node(rev) |
469 | 484 except (ValueError, OverflowError): |
36
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485 c = [] |
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486 for n in self.nodemap: |
469 | 487 if hex(n).startswith(id): |
36
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488 c.append(n) |
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489 if len(c) > 1: raise RevlogError(_("Ambiguous identifier")) |
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490 if len(c) < 1: raise RevlogError(_("No match found")) |
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491 return c[0] |
515 | 492 |
36
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493 return None |
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494 |
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495 def diff(self, a, b): |
1083 | 496 """return a delta between two revisions""" |
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497 return mdiff.textdiff(a, b) |
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498 |
73 | 499 def patches(self, t, pl): |
1083 | 500 """apply a list of patches to a string""" |
73 | 501 return mdiff.patches(t, pl) |
502 | |
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503 def chunk(self, rev): |
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504 start, length = self.start(rev), self.length(rev) |
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505 end = start + length |
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506 |
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507 def loadcache(): |
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508 cache_length = max(4096 * 1024, length) # 4Mo |
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509 df = self.opener(self.datafile) |
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510 df.seek(start) |
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511 self.chunkcache = (start, df.read(cache_length)) |
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512 |
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513 if not self.chunkcache: |
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514 loadcache() |
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515 |
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516 cache_start = self.chunkcache[0] |
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517 cache_end = cache_start + len(self.chunkcache[1]) |
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518 if start >= cache_start and end <= cache_end: |
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519 # it is cached |
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520 offset = start - cache_start |
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521 else: |
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522 loadcache() |
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523 offset = 0 |
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524 |
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525 #def checkchunk(): |
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526 # df = self.opener(self.datafile) |
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527 # df.seek(start) |
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528 # return df.read(length) |
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529 #assert s == checkchunk() |
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530 return decompress(self.chunkcache[1][offset:offset + length]) |
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531 |
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532 def delta(self, node): |
1083 | 533 """return or calculate a delta between a node and its predecessor""" |
119
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534 r = self.rev(node) |
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535 return self.revdiff(r - 1, r) |
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536 |
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537 def revdiff(self, rev1, rev2): |
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538 """return or calculate a delta between two revisions""" |
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539 b1 = self.base(rev1) |
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540 b2 = self.base(rev2) |
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541 if b1 == b2 and rev1 + 1 == rev2: |
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542 return self.chunk(rev2) |
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543 else: |
1941
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544 return self.diff(self.revision(self.node(rev1)), |
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545 self.revision(self.node(rev2))) |
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546 |
0
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547 def revision(self, node): |
1083 | 548 """return an uncompressed revision of a given""" |
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549 if node == nullid: return "" |
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550 if self.cache and self.cache[0] == node: return self.cache[2] |
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551 |
1083 | 552 # look up what we need to read |
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553 text = None |
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554 rev = self.rev(node) |
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555 base = self.base(rev) |
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556 |
1083 | 557 # do we have useful data cached? |
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558 if self.cache and self.cache[1] >= base and self.cache[1] < rev: |
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559 base = self.cache[1] |
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560 text = self.cache[2] |
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561 else: |
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562 text = self.chunk(base) |
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563 |
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564 bins = [] |
64 | 565 for r in xrange(base + 1, rev + 1): |
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566 bins.append(self.chunk(r)) |
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567 |
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568 text = self.patches(text, bins) |
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569 |
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570 p1, p2 = self.parents(node) |
26 | 571 if node != hash(text, p1, p2): |
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572 raise RevlogError(_("integrity check failed on %s:%d") |
98 | 573 % (self.datafile, rev)) |
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574 |
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575 self.cache = (node, rev, text) |
515 | 576 return text |
0
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577 |
644 | 578 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
1083 | 579 """add a revision to the log |
580 | |
581 text - the revision data to add | |
582 transaction - the transaction object used for rollback | |
583 link - the linkrev data to add | |
584 p1, p2 - the parent nodeids of the revision | |
585 d - an optional precomputed delta | |
586 """ | |
0
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587 if text is None: text = "" |
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588 if p1 is None: p1 = self.tip() |
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589 if p2 is None: p2 = nullid |
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590 |
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591 node = hash(text, p1, p2) |
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592 |
301 | 593 if node in self.nodemap: |
594 return node | |
595 | |
0
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596 n = self.count() |
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597 t = n - 1 |
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598 |
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599 if n: |
64 | 600 base = self.base(t) |
601 start = self.start(base) | |
0
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602 end = self.end(t) |
644 | 603 if not d: |
604 prev = self.revision(self.tip()) | |
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605 d = self.diff(prev, str(text)) |
98 | 606 data = compress(d) |
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607 l = len(data[1]) + len(data[0]) |
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608 dist = end - start + l |
0
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609 |
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610 # full versions are inserted when the needed deltas |
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611 # become comparable to the uncompressed text |
64 | 612 if not n or dist > len(text) * 2: |
0
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613 data = compress(text) |
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614 l = len(data[1]) + len(data[0]) |
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615 base = n |
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616 else: |
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617 base = self.base(t) |
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618 |
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619 offset = 0 |
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620 if t >= 0: |
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621 offset = self.end(t) |
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622 |
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623 e = (offset, l, base, link, p1, p2, node) |
515 | 624 |
0
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625 self.index.append(e) |
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626 self.nodemap[node] = n |
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627 entry = struct.pack(indexformat, *e) |
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628 |
26 | 629 transaction.add(self.datafile, e[0]) |
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630 f = self.opener(self.datafile, "a") |
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631 if data[0]: |
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632 f.write(data[0]) |
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633 f.write(data[1]) |
41 | 634 transaction.add(self.indexfile, n * len(entry)) |
0
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635 self.opener(self.indexfile, "a").write(entry) |
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636 |
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637 self.cache = (node, n, text) |
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638 return node |
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639 |
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640 def ancestor(self, a, b): |
1083 | 641 """calculate the least common ancestor of nodes a and b""" |
147 | 642 # calculate the distance of every node from root |
643 dist = {nullid: 0} | |
644 for i in xrange(self.count()): | |
645 n = self.node(i) | |
646 p1, p2 = self.parents(n) | |
647 dist[n] = max(dist[p1], dist[p2]) + 1 | |
515 | 648 |
147 | 649 # traverse ancestors in order of decreasing distance from root |
650 def ancestors(node): | |
651 # we store negative distances because heap returns smallest member | |
652 h = [(-dist[node], node)] | |
653 seen = {} | |
654 while h: | |
655 d, n = heapq.heappop(h) | |
656 if n not in seen: | |
657 seen[n] = 1 | |
1351
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658 yield (-d, n) |
147 | 659 for p in self.parents(n): |
660 heapq.heappush(h, (-dist[p], p)) | |
45
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661 |
1351
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662 def generations(node): |
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663 sg, s = None, {} |
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664 for g,n in ancestors(node): |
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665 if g != sg: |
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666 if sg: |
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667 yield sg, s |
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668 sg, s = g, {n:1} |
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669 else: |
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670 s[n] = 1 |
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671 yield sg, s |
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672 |
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673 x = generations(a) |
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674 y = generations(b) |
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675 gx = x.next() |
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676 gy = y.next() |
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677 |
147 | 678 # increment each ancestor list until it is closer to root than |
679 # the other, or they match | |
680 while 1: | |
1351
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681 #print "ancestor gen %s %s" % (gx[0], gy[0]) |
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682 if gx[0] == gy[0]: |
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683 # find the intersection |
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684 i = [ n for n in gx[1] if n in gy[1] ] |
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685 if i: |
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686 return i[0] |
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687 else: |
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688 #print "next" |
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689 gy = y.next() |
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690 gx = x.next() |
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691 elif gx[0] < gy[0]: |
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692 #print "next y" |
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693 gy = y.next() |
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694 else: |
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695 #print "next x" |
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696 gx = x.next() |
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697 |
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698 def group(self, nodelist, lookup, infocollect=None): |
1083 | 699 """calculate a delta group |
46 | 700 |
1083 | 701 Given a list of changeset revs, return a set of deltas and |
702 metadata corresponding to nodes. the first delta is | |
703 parent(nodes[0]) -> nodes[0] the receiver is guaranteed to | |
704 have this parent as it has all history before these | |
705 changesets. parent is parent[0] | |
706 """ | |
1458
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707 revs = [self.rev(n) for n in nodelist] |
46 | 708 |
709 # if we don't have any revisions touched by these changesets, bail | |
192 | 710 if not revs: |
711 yield struct.pack(">l", 0) | |
712 return | |
46 | 713 |
714 # add the parent of the first rev | |
715 p = self.parents(self.node(revs[0]))[0] | |
716 revs.insert(0, self.rev(p)) | |
717 | |
718 # build deltas | |
71
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719 for d in xrange(0, len(revs) - 1): |
46 | 720 a, b = revs[d], revs[d + 1] |
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721 nb = self.node(b) |
192 | 722 |
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723 if infocollect is not None: |
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724 infocollect(nb) |
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725 |
1941
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726 d = self.revdiff(a, b) |
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727 p = self.parents(nb) |
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728 meta = nb + p[0] + p[1] + lookup(nb) |
46 | 729 l = struct.pack(">l", len(meta) + len(d) + 4) |
192 | 730 yield l |
731 yield meta | |
732 yield d | |
46 | 733 |
192 | 734 yield struct.pack(">l", 0) |
735 | |
1062 | 736 def addgroup(self, revs, linkmapper, transaction, unique=0): |
1083 | 737 """ |
738 add a delta group | |
46 | 739 |
1083 | 740 given a set of deltas, add them to the revision log. the |
741 first delta is against its parent, which should be in our | |
742 log, the rest are against the previous delta. | |
743 """ | |
744 | |
745 #track the base of the current delta log | |
46 | 746 r = self.count() |
747 t = r - 1 | |
192 | 748 node = nullid |
515 | 749 |
655 | 750 base = prev = -1 |
653
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751 start = end = measure = 0 |
46 | 752 if r: |
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753 base = self.base(t) |
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754 start = self.start(base) |
46 | 755 end = self.end(t) |
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756 measure = self.length(base) |
46 | 757 prev = self.tip() |
758 | |
759 transaction.add(self.datafile, end) | |
760 transaction.add(self.indexfile, r * struct.calcsize(indexformat)) | |
761 dfh = self.opener(self.datafile, "a") | |
762 ifh = self.opener(self.indexfile, "a") | |
763 | |
764 # loop through our set of deltas | |
192 | 765 chain = None |
766 for chunk in revs: | |
767 node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) | |
94 | 768 link = linkmapper(cs) |
77 | 769 if node in self.nodemap: |
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770 # this can happen if two branches make the same change |
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771 # if unique: |
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772 # raise RevlogError(_("already have %s") % hex(node[:4])) |
653
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773 chain = node |
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774 continue |
192 | 775 delta = chunk[80:] |
776 | |
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777 for p in (p1, p2): |
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778 if not p in self.nodemap: |
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779 raise RevlogError(_("unknown parent %s") % short(p1)) |
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780 |
192 | 781 if not chain: |
782 # retrieve the parent revision of the delta chain | |
783 chain = p1 | |
784 if not chain in self.nodemap: | |
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785 raise RevlogError(_("unknown base %s") % short(chain[:4])) |
46 | 786 |
787 # full versions are inserted when the needed deltas become | |
788 # comparable to the uncompressed text or when the previous | |
789 # version is not the one we have a delta against. We use | |
790 # the size of the previous full rev as a proxy for the | |
791 # current size. | |
792 | |
793 if chain == prev: | |
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794 tempd = compress(delta) |
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795 cdelta = tempd[0] + tempd[1] |
46 | 796 |
797 if chain != prev or (end - start + len(cdelta)) > measure * 2: | |
798 # flush our writes here so we can read it in revision | |
799 dfh.flush() | |
800 ifh.flush() | |
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801 text = self.revision(chain) |
73 | 802 text = self.patches(text, [delta]) |
46 | 803 chk = self.addrevision(text, transaction, link, p1, p2) |
804 if chk != node: | |
1402
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805 raise RevlogError(_("consistency error adding group")) |
46 | 806 measure = len(text) |
807 else: | |
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808 e = (end, len(cdelta), base, link, p1, p2, node) |
46 | 809 self.index.append(e) |
810 self.nodemap[node] = r | |
811 dfh.write(cdelta) | |
812 ifh.write(struct.pack(indexformat, *e)) | |
813 | |
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814 t, r, chain, prev = r, r + 1, node, node |
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815 base = self.base(t) |
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816 start = self.start(base) |
46 | 817 end = self.end(t) |
818 | |
819 dfh.close() | |
820 ifh.close() | |
821 return node | |
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822 |
1535
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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(): |
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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(): |
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834 return |
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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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|
852 |
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853 |
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854 def checksize(self): |
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parents:
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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) |
1667
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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: |
1667
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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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881 return (dd, di) |
1494
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882 |
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883 |