author | Bart Trojanowski <bart@jukie.net> |
Fri, 26 Aug 2005 19:08:25 -0700 | |
changeset 1073 | 7b35a980b982 |
parent 1062 | 6d5a62a549fa |
child 1074 | 55bf5cfde69e |
permissions | -rw-r--r-- |
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# revlog.py - storage back-end for mercurial |
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# |
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# This provides efficient delta storage with O(1) retrieve and append |
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# and O(changes) merge between branches |
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# |
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# Copyright 2005 Matt Mackall <mpm@selenic.com> |
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# |
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# This software may be used and distributed according to the terms |
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# of the GNU General Public License, incorporated herein by reference. |
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import zlib, struct, sha, binascii, heapq |
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from mercurial import mdiff |
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def hex(node): return binascii.hexlify(node) |
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def bin(node): return binascii.unhexlify(node) |
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def short(node): return hex(node[:6]) |
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def compress(text): |
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if not text: return text |
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if len(text) < 44: |
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if text[0] == '\0': return text |
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return 'u' + text |
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bin = zlib.compress(text) |
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if len(bin) > len(text): |
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if text[0] == '\0': return text |
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return 'u' + text |
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return bin |
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def decompress(bin): |
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if not bin: return bin |
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t = bin[0] |
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if t == '\0': return bin |
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if t == 'x': return zlib.decompress(bin) |
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if t == 'u': return bin[1:] |
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raise RevlogError("unknown compression type %s" % t) |
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def hash(text, p1, p2): |
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l = [p1, p2] |
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l.sort() |
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s = sha.new(l[0]) |
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s.update(l[1]) |
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s.update(text) |
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return s.digest() |
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nullid = "\0" * 20 |
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indexformat = ">4l20s20s20s" |
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class lazyparser: |
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def __init__(self, data, revlog): |
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self.data = data |
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self.s = struct.calcsize(indexformat) |
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self.l = len(data)/self.s |
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self.index = [None] * self.l |
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self.map = {nullid: -1} |
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self.all = 0 |
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self.revlog = revlog |
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def load(self, pos=None): |
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if self.all: return |
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if pos is not None: |
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block = pos / 1000 |
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i = block * 1000 |
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end = min(self.l, i + 1000) |
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else: |
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self.all = 1 |
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i = 0 |
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end = self.l |
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self.revlog.index = self.index |
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self.revlog.nodemap = self.map |
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while i < end: |
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d = self.data[i * self.s: (i + 1) * self.s] |
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e = struct.unpack(indexformat, d) |
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self.index[i] = e |
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self.map[e[6]] = i |
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i += 1 |
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class lazyindex: |
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def __init__(self, parser): |
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self.p = parser |
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def __len__(self): |
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return len(self.p.index) |
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def load(self, pos): |
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self.p.load(pos) |
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return self.p.index[pos] |
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def __getitem__(self, pos): |
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return self.p.index[pos] or self.load(pos) |
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def append(self, e): |
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self.p.index.append(e) |
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class lazymap: |
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def __init__(self, parser): |
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self.p = parser |
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def load(self, key): |
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if self.p.all: return |
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n = self.p.data.find(key) |
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if n < 0: raise KeyError("node " + hex(key)) |
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pos = n / self.p.s |
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self.p.load(pos) |
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def __contains__(self, key): |
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self.p.load() |
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return key in self.p.map |
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def __iter__(self): |
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yield nullid |
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for i in xrange(self.p.l): |
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try: |
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yield self.p.index[i][6] |
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except: |
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self.p.load(i) |
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yield self.p.index[i][6] |
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def __getitem__(self, key): |
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try: |
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return self.p.map[key] |
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except KeyError: |
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try: |
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self.load(key) |
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return self.p.map[key] |
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except KeyError: |
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raise KeyError("node " + hex(key)) |
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def __setitem__(self, key, val): |
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self.p.map[key] = val |
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class RevlogError(Exception): pass |
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class revlog: |
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def __init__(self, opener, indexfile, datafile): |
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self.indexfile = indexfile |
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self.datafile = datafile |
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self.opener = opener |
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self.cache = None |
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try: |
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i = self.opener(self.indexfile).read() |
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except IOError: |
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i = "" |
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if len(i) > 10000: |
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# big index, let's parse it on demand |
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parser = lazyparser(i, self) |
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self.index = lazyindex(parser) |
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self.nodemap = lazymap(parser) |
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else: |
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s = struct.calcsize(indexformat) |
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l = len(i) / s |
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self.index = [None] * l |
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m = [None] * l |
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n = 0 |
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for f in xrange(0, len(i), s): |
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# offset, size, base, linkrev, p1, p2, nodeid |
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e = struct.unpack(indexformat, i[f:f + s]) |
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m[n] = (e[6], n) |
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self.index[n] = e |
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n += 1 |
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self.nodemap = dict(m) |
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self.nodemap[nullid] = -1 |
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def tip(self): return self.node(len(self.index) - 1) |
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def count(self): return len(self.index) |
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def node(self, rev): return (rev < 0) and nullid or self.index[rev][6] |
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def rev(self, node): return self.nodemap[node] |
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def linkrev(self, node): return self.index[self.nodemap[node]][3] |
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def parents(self, node): |
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if node == nullid: return (nullid, nullid) |
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return self.index[self.nodemap[node]][4:6] |
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168 |
def start(self, rev): return self.index[rev][0] |
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169 |
def length(self, rev): return self.index[rev][1] |
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170 |
def end(self, rev): return self.start(rev) + self.length(rev) |
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171 |
def base(self, rev): return self.index[rev][2] |
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172 |
|
902 | 173 |
def heads(self, stop=None): |
221 | 174 |
p = {} |
175 |
h = [] |
|
902 | 176 |
stoprev = 0 |
177 |
if stop and stop in self.nodemap: |
|
178 |
stoprev = self.rev(stop) |
|
179 |
||
243 | 180 |
for r in range(self.count() - 1, -1, -1): |
221 | 181 |
n = self.node(r) |
182 |
if n not in p: |
|
183 |
h.append(n) |
|
902 | 184 |
if n == stop: |
185 |
break |
|
186 |
if r < stoprev: |
|
187 |
break |
|
221 | 188 |
for pn in self.parents(n): |
189 |
p[pn] = 1 |
|
190 |
return h |
|
370 | 191 |
|
192 |
def children(self, node): |
|
193 |
c = [] |
|
194 |
p = self.rev(node) |
|
195 |
for r in range(p + 1, self.count()): |
|
196 |
n = self.node(r) |
|
197 |
for pn in self.parents(n): |
|
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|
198 |
if pn == node: |
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|
199 |
c.append(n) |
370 | 200 |
continue |
201 |
elif pn == nullid: |
|
202 |
continue |
|
203 |
return c |
|
515 | 204 |
|
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205 |
def lookup(self, id): |
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206 |
try: |
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207 |
rev = int(id) |
469 | 208 |
if str(rev) != id: raise ValueError |
209 |
if rev < 0: rev = self.count() + rev |
|
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|
210 |
if rev < 0 or rev >= self.count(): raise ValueError |
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211 |
return self.node(rev) |
469 | 212 |
except (ValueError, OverflowError): |
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213 |
c = [] |
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214 |
for n in self.nodemap: |
469 | 215 |
if hex(n).startswith(id): |
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216 |
c.append(n) |
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217 |
if len(c) > 1: raise KeyError("Ambiguous identifier") |
67 | 218 |
if len(c) < 1: raise KeyError("No match found") |
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219 |
return c[0] |
515 | 220 |
|
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221 |
return None |
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222 |
|
0
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223 |
def diff(self, a, b): |
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224 |
return mdiff.textdiff(a, b) |
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225 |
|
73 | 226 |
def patches(self, t, pl): |
227 |
return mdiff.patches(t, pl) |
|
228 |
||
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229 |
def delta(self, node): |
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230 |
r = self.rev(node) |
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231 |
b = self.base(r) |
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232 |
if r == b: |
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233 |
return self.diff(self.revision(self.node(r - 1)), |
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234 |
self.revision(node)) |
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235 |
else: |
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236 |
f = self.opener(self.datafile) |
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237 |
f.seek(self.start(r)) |
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238 |
data = f.read(self.length(r)) |
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239 |
return decompress(data) |
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|
240 |
|
0
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241 |
def revision(self, node): |
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242 |
if node == nullid: return "" |
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243 |
if self.cache and self.cache[0] == node: return self.cache[2] |
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244 |
|
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245 |
text = None |
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246 |
rev = self.rev(node) |
117 | 247 |
start, length, base, link, p1, p2, node = self.index[rev] |
248 |
end = start + length |
|
249 |
if base != rev: start = self.start(base) |
|
0
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250 |
|
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251 |
if self.cache and self.cache[1] >= base and self.cache[1] < rev: |
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252 |
base = self.cache[1] |
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253 |
start = self.start(base + 1) |
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254 |
text = self.cache[2] |
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255 |
last = 0 |
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256 |
|
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257 |
f = self.opener(self.datafile) |
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258 |
f.seek(start) |
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259 |
data = f.read(end - start) |
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260 |
|
651 | 261 |
if text is None: |
0
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262 |
last = self.length(base) |
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263 |
text = decompress(data[:last]) |
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264 |
|
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|
265 |
bins = [] |
64 | 266 |
for r in xrange(base + 1, rev + 1): |
0
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267 |
s = self.length(r) |
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268 |
bins.append(decompress(data[last:last + s])) |
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269 |
last = last + s |
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270 |
|
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271 |
text = mdiff.patches(text, bins) |
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272 |
|
26 | 273 |
if node != hash(text, p1, p2): |
98 | 274 |
raise IOError("integrity check failed on %s:%d" |
275 |
% (self.datafile, rev)) |
|
0
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276 |
|
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277 |
self.cache = (node, rev, text) |
515 | 278 |
return text |
0
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279 |
|
644 | 280 |
def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
0
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281 |
if text is None: text = "" |
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282 |
if p1 is None: p1 = self.tip() |
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|
283 |
if p2 is None: p2 = nullid |
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|
284 |
|
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|
285 |
node = hash(text, p1, p2) |
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|
286 |
|
301 | 287 |
if node in self.nodemap: |
288 |
return node |
|
289 |
||
0
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290 |
n = self.count() |
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|
291 |
t = n - 1 |
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|
292 |
|
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293 |
if n: |
64 | 294 |
base = self.base(t) |
295 |
start = self.start(base) |
|
0
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296 |
end = self.end(t) |
644 | 297 |
if not d: |
298 |
prev = self.revision(self.tip()) |
|
299 |
d = self.diff(prev, text) |
|
98 | 300 |
data = compress(d) |
64 | 301 |
dist = end - start + len(data) |
0
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|
302 |
|
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303 |
# full versions are inserted when the needed deltas |
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304 |
# become comparable to the uncompressed text |
64 | 305 |
if not n or dist > len(text) * 2: |
0
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|
306 |
data = compress(text) |
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|
307 |
base = n |
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|
308 |
else: |
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309 |
base = self.base(t) |
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310 |
|
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311 |
offset = 0 |
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|
312 |
if t >= 0: |
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313 |
offset = self.end(t) |
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|
314 |
|
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315 |
e = (offset, len(data), base, link, p1, p2, node) |
515 | 316 |
|
0
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317 |
self.index.append(e) |
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|
318 |
self.nodemap[node] = n |
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|
319 |
entry = struct.pack(indexformat, *e) |
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|
320 |
|
26 | 321 |
transaction.add(self.datafile, e[0]) |
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322 |
self.opener(self.datafile, "a").write(data) |
41 | 323 |
transaction.add(self.indexfile, n * len(entry)) |
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|
324 |
self.opener(self.indexfile, "a").write(entry) |
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|
325 |
|
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326 |
self.cache = (node, n, text) |
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327 |
return node |
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328 |
|
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329 |
def ancestor(self, a, b): |
147 | 330 |
# calculate the distance of every node from root |
331 |
dist = {nullid: 0} |
|
332 |
for i in xrange(self.count()): |
|
333 |
n = self.node(i) |
|
334 |
p1, p2 = self.parents(n) |
|
335 |
dist[n] = max(dist[p1], dist[p2]) + 1 |
|
515 | 336 |
|
147 | 337 |
# traverse ancestors in order of decreasing distance from root |
338 |
def ancestors(node): |
|
339 |
# we store negative distances because heap returns smallest member |
|
340 |
h = [(-dist[node], node)] |
|
341 |
seen = {} |
|
342 |
earliest = self.count() |
|
343 |
while h: |
|
344 |
d, n = heapq.heappop(h) |
|
345 |
if n not in seen: |
|
346 |
seen[n] = 1 |
|
381 | 347 |
r = self.rev(n) |
348 |
yield (-d, r, n) |
|
147 | 349 |
for p in self.parents(n): |
350 |
heapq.heappush(h, (-dist[p], p)) |
|
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|
351 |
|
147 | 352 |
x = ancestors(a) |
353 |
y = ancestors(b) |
|
354 |
lx = x.next() |
|
355 |
ly = y.next() |
|
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|
356 |
|
147 | 357 |
# increment each ancestor list until it is closer to root than |
358 |
# the other, or they match |
|
359 |
while 1: |
|
360 |
if lx == ly: |
|
381 | 361 |
return lx[2] |
147 | 362 |
elif lx < ly: |
363 |
ly = y.next() |
|
364 |
elif lx > ly: |
|
365 |
lx = x.next() |
|
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366 |
|
46 | 367 |
def group(self, linkmap): |
368 |
# given a list of changeset revs, return a set of deltas and |
|
94 | 369 |
# metadata corresponding to nodes. the first delta is |
46 | 370 |
# parent(nodes[0]) -> nodes[0] the receiver is guaranteed to |
371 |
# have this parent as it has all history before these |
|
372 |
# changesets. parent is parent[0] |
|
373 |
||
374 |
revs = [] |
|
375 |
needed = {} |
|
376 |
||
377 |
# find file nodes/revs that match changeset revs |
|
378 |
for i in xrange(0, self.count()): |
|
379 |
if self.index[i][3] in linkmap: |
|
380 |
revs.append(i) |
|
381 |
needed[i] = 1 |
|
382 |
||
383 |
# if we don't have any revisions touched by these changesets, bail |
|
192 | 384 |
if not revs: |
385 |
yield struct.pack(">l", 0) |
|
386 |
return |
|
46 | 387 |
|
388 |
# add the parent of the first rev |
|
389 |
p = self.parents(self.node(revs[0]))[0] |
|
390 |
revs.insert(0, self.rev(p)) |
|
391 |
||
392 |
# for each delta that isn't contiguous in the log, we need to |
|
393 |
# reconstruct the base, reconstruct the result, and then |
|
394 |
# calculate the delta. We also need to do this where we've |
|
395 |
# stored a full version and not a delta |
|
396 |
for i in xrange(0, len(revs) - 1): |
|
397 |
a, b = revs[i], revs[i + 1] |
|
398 |
if a + 1 != b or self.base(b) == b: |
|
399 |
for j in xrange(self.base(a), a + 1): |
|
400 |
needed[j] = 1 |
|
401 |
for j in xrange(self.base(b), b + 1): |
|
402 |
needed[j] = 1 |
|
403 |
||
404 |
# calculate spans to retrieve from datafile |
|
405 |
needed = needed.keys() |
|
406 |
needed.sort() |
|
407 |
spans = [] |
|
192 | 408 |
oo = -1 |
409 |
ol = 0 |
|
46 | 410 |
for n in needed: |
411 |
if n < 0: continue |
|
412 |
o = self.start(n) |
|
413 |
l = self.length(n) |
|
192 | 414 |
if oo + ol == o: # can we merge with the previous? |
415 |
nl = spans[-1][2] |
|
416 |
nl.append((n, l)) |
|
417 |
ol += l |
|
418 |
spans[-1] = (oo, ol, nl) |
|
46 | 419 |
else: |
192 | 420 |
oo = o |
421 |
ol = l |
|
422 |
spans.append((oo, ol, [(n, l)])) |
|
46 | 423 |
|
424 |
# read spans in, divide up chunks |
|
425 |
chunks = {} |
|
192 | 426 |
for span in spans: |
46 | 427 |
# we reopen the file for each span to make http happy for now |
428 |
f = self.opener(self.datafile) |
|
429 |
f.seek(span[0]) |
|
430 |
data = f.read(span[1]) |
|
431 |
||
432 |
# divide up the span |
|
433 |
pos = 0 |
|
434 |
for r, l in span[2]: |
|
192 | 435 |
chunks[r] = decompress(data[pos: pos + l]) |
46 | 436 |
pos += l |
437 |
||
438 |
# helper to reconstruct intermediate versions |
|
439 |
def construct(text, base, rev): |
|
192 | 440 |
bins = [chunks[r] for r in xrange(base + 1, rev + 1)] |
71
47c9a869adee
Add mdiff.patches to speed up applying thousands of patches to the manifest
mpm@selenic.com
parents:
67
diff
changeset
|
441 |
return mdiff.patches(text, bins) |
46 | 442 |
|
443 |
# build deltas |
|
444 |
deltas = [] |
|
71
47c9a869adee
Add mdiff.patches to speed up applying thousands of patches to the manifest
mpm@selenic.com
parents:
67
diff
changeset
|
445 |
for d in xrange(0, len(revs) - 1): |
46 | 446 |
a, b = revs[d], revs[d + 1] |
447 |
n = self.node(b) |
|
192 | 448 |
|
449 |
# do we need to construct a new delta? |
|
46 | 450 |
if a + 1 != b or self.base(b) == b: |
451 |
if a >= 0: |
|
452 |
base = self.base(a) |
|
192 | 453 |
ta = chunks[self.base(a)] |
46 | 454 |
ta = construct(ta, base, a) |
455 |
else: |
|
456 |
ta = "" |
|
515 | 457 |
|
46 | 458 |
base = self.base(b) |
459 |
if a > base: |
|
460 |
base = a |
|
461 |
tb = ta |
|
462 |
else: |
|
192 | 463 |
tb = chunks[self.base(b)] |
46 | 464 |
tb = construct(tb, base, b) |
465 |
d = self.diff(ta, tb) |
|
466 |
else: |
|
192 | 467 |
d = chunks[b] |
46 | 468 |
|
469 |
p = self.parents(n) |
|
470 |
meta = n + p[0] + p[1] + linkmap[self.linkrev(n)] |
|
471 |
l = struct.pack(">l", len(meta) + len(d) + 4) |
|
192 | 472 |
yield l |
473 |
yield meta |
|
474 |
yield d |
|
46 | 475 |
|
192 | 476 |
yield struct.pack(">l", 0) |
477 |
||
1062 | 478 |
def addgroup(self, revs, linkmapper, transaction, unique=0): |
46 | 479 |
# given a set of deltas, add them to the revision log. the |
480 |
# first delta is against its parent, which should be in our |
|
481 |
# log, the rest are against the previous delta. |
|
482 |
||
483 |
# track the base of the current delta log |
|
484 |
r = self.count() |
|
485 |
t = r - 1 |
|
192 | 486 |
node = nullid |
515 | 487 |
|
655 | 488 |
base = prev = -1 |
653
94cdd02792b5
Fix corruption resulting from skipping parts of a revision group
Matt Mackall <mpm@selenic.com>
parents:
651
diff
changeset
|
489 |
start = end = measure = 0 |
46 | 490 |
if r: |
491 |
start = self.start(self.base(t)) |
|
492 |
end = self.end(t) |
|
493 |
measure = self.length(self.base(t)) |
|
494 |
base = self.base(t) |
|
495 |
prev = self.tip() |
|
496 |
||
497 |
transaction.add(self.datafile, end) |
|
498 |
transaction.add(self.indexfile, r * struct.calcsize(indexformat)) |
|
499 |
dfh = self.opener(self.datafile, "a") |
|
500 |
ifh = self.opener(self.indexfile, "a") |
|
501 |
||
502 |
# loop through our set of deltas |
|
192 | 503 |
chain = None |
504 |
for chunk in revs: |
|
505 |
node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) |
|
94 | 506 |
link = linkmapper(cs) |
77 | 507 |
if node in self.nodemap: |
224
ccbcc4d76f81
fix bad assumption about uniqueness of file versions
mpm@selenic.com
parents:
221
diff
changeset
|
508 |
# this can happen if two branches make the same change |
ccbcc4d76f81
fix bad assumption about uniqueness of file versions
mpm@selenic.com
parents:
221
diff
changeset
|
509 |
if unique: |
1073
7b35a980b982
[PATCH] raise exceptions with Exception subclasses
Bart Trojanowski <bart@jukie.net>
parents:
1062
diff
changeset
|
510 |
raise RevlogError("already have %s" % hex(node[:4])) |
653
94cdd02792b5
Fix corruption resulting from skipping parts of a revision group
Matt Mackall <mpm@selenic.com>
parents:
651
diff
changeset
|
511 |
chain = node |
224
ccbcc4d76f81
fix bad assumption about uniqueness of file versions
mpm@selenic.com
parents:
221
diff
changeset
|
512 |
continue |
192 | 513 |
delta = chunk[80:] |
514 |
||
515 |
if not chain: |
|
516 |
# retrieve the parent revision of the delta chain |
|
517 |
chain = p1 |
|
518 |
if not chain in self.nodemap: |
|
1073
7b35a980b982
[PATCH] raise exceptions with Exception subclasses
Bart Trojanowski <bart@jukie.net>
parents:
1062
diff
changeset
|
519 |
raise RevlogError("unknown base %s" % short(chain[:4])) |
46 | 520 |
|
521 |
# full versions are inserted when the needed deltas become |
|
522 |
# comparable to the uncompressed text or when the previous |
|
523 |
# version is not the one we have a delta against. We use |
|
524 |
# the size of the previous full rev as a proxy for the |
|
525 |
# current size. |
|
526 |
||
527 |
if chain == prev: |
|
528 |
cdelta = compress(delta) |
|
529 |
||
530 |
if chain != prev or (end - start + len(cdelta)) > measure * 2: |
|
531 |
# flush our writes here so we can read it in revision |
|
532 |
dfh.flush() |
|
533 |
ifh.flush() |
|
65
d40cc5aacc31
Fix up a bunch of bugs in the new merge code
mpm@selenic.com
parents:
64
diff
changeset
|
534 |
text = self.revision(chain) |
73 | 535 |
text = self.patches(text, [delta]) |
46 | 536 |
chk = self.addrevision(text, transaction, link, p1, p2) |
537 |
if chk != node: |
|
1073
7b35a980b982
[PATCH] raise exceptions with Exception subclasses
Bart Trojanowski <bart@jukie.net>
parents:
1062
diff
changeset
|
538 |
raise RevlogError("consistency error adding group") |
46 | 539 |
measure = len(text) |
540 |
else: |
|
541 |
e = (end, len(cdelta), self.base(t), link, p1, p2, node) |
|
542 |
self.index.append(e) |
|
543 |
self.nodemap[node] = r |
|
544 |
dfh.write(cdelta) |
|
545 |
ifh.write(struct.pack(indexformat, *e)) |
|
546 |
||
65
d40cc5aacc31
Fix up a bunch of bugs in the new merge code
mpm@selenic.com
parents:
64
diff
changeset
|
547 |
t, r, chain, prev = r, r + 1, node, node |
46 | 548 |
start = self.start(self.base(t)) |
549 |
end = self.end(t) |
|
550 |
||
551 |
dfh.close() |
|
552 |
ifh.close() |
|
553 |
return node |