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@@ -1,510 +1,513 b'' | |||||
1 | # revlog.py - storage back-end for mercurial |
|
1 | # revlog.py - storage back-end for mercurial | |
2 | # |
|
2 | # | |
3 | # This provides efficient delta storage with O(1) retrieve and append |
|
3 | # This provides efficient delta storage with O(1) retrieve and append | |
4 | # and O(changes) merge between branches |
|
4 | # and O(changes) merge between branches | |
5 | # |
|
5 | # | |
6 | # Copyright 2005 Matt Mackall <mpm@selenic.com> |
|
6 | # Copyright 2005 Matt Mackall <mpm@selenic.com> | |
7 | # |
|
7 | # | |
8 | # This software may be used and distributed according to the terms |
|
8 | # This software may be used and distributed according to the terms | |
9 | # of the GNU General Public License, incorporated herein by reference. |
|
9 | # of the GNU General Public License, incorporated herein by reference. | |
10 |
|
10 | |||
11 | import zlib, struct, sha, binascii, heapq |
|
11 | import zlib, struct, sha, binascii, heapq | |
12 | from mercurial import mdiff |
|
12 | from mercurial import mdiff | |
13 |
|
13 | |||
14 | def hex(node): return binascii.hexlify(node) |
|
14 | def hex(node): return binascii.hexlify(node) | |
15 | def bin(node): return binascii.unhexlify(node) |
|
15 | def bin(node): return binascii.unhexlify(node) | |
16 | def short(node): return hex(node[:4]) |
|
16 | def short(node): return hex(node[:4]) | |
17 |
|
17 | |||
18 | def compress(text): |
|
18 | def compress(text): | |
19 | if not text: return text |
|
19 | if not text: return text | |
20 | if len(text) < 44: |
|
20 | if len(text) < 44: | |
21 | if text[0] == '\0': return text |
|
21 | if text[0] == '\0': return text | |
22 | return 'u' + text |
|
22 | return 'u' + text | |
23 | bin = zlib.compress(text) |
|
23 | bin = zlib.compress(text) | |
24 | if len(bin) > len(text): |
|
24 | if len(bin) > len(text): | |
25 | if text[0] == '\0': return text |
|
25 | if text[0] == '\0': return text | |
26 | return 'u' + text |
|
26 | return 'u' + text | |
27 | return bin |
|
27 | return bin | |
28 |
|
28 | |||
29 | def decompress(bin): |
|
29 | def decompress(bin): | |
30 | if not bin: return bin |
|
30 | if not bin: return bin | |
31 | t = bin[0] |
|
31 | t = bin[0] | |
32 | if t == '\0': return bin |
|
32 | if t == '\0': return bin | |
33 | if t == 'x': return zlib.decompress(bin) |
|
33 | if t == 'x': return zlib.decompress(bin) | |
34 | if t == 'u': return bin[1:] |
|
34 | if t == 'u': return bin[1:] | |
35 | raise "unknown compression type %s" % t |
|
35 | raise "unknown compression type %s" % t | |
36 |
|
36 | |||
37 | def hash(text, p1, p2): |
|
37 | def hash(text, p1, p2): | |
38 | l = [p1, p2] |
|
38 | l = [p1, p2] | |
39 | l.sort() |
|
39 | l.sort() | |
40 | return sha.sha(l[0] + l[1] + text).digest() |
|
40 | return sha.sha(l[0] + l[1] + text).digest() | |
41 |
|
41 | |||
42 | nullid = "\0" * 20 |
|
42 | nullid = "\0" * 20 | |
43 | indexformat = ">4l20s20s20s" |
|
43 | indexformat = ">4l20s20s20s" | |
44 |
|
44 | |||
45 | class lazyparser: |
|
45 | class lazyparser: | |
46 | def __init__(self, data): |
|
46 | def __init__(self, data): | |
47 | self.data = data |
|
47 | self.data = data | |
48 | self.s = struct.calcsize(indexformat) |
|
48 | self.s = struct.calcsize(indexformat) | |
49 | self.l = len(data)/self.s |
|
49 | self.l = len(data)/self.s | |
50 | self.index = [None] * self.l |
|
50 | self.index = [None] * self.l | |
51 | self.map = {nullid: -1} |
|
51 | self.map = {nullid: -1} | |
52 |
|
52 | |||
53 | def load(self, pos): |
|
53 | def load(self, pos): | |
54 | block = pos / 1000 |
|
54 | block = pos / 1000 | |
55 | i = block * 1000 |
|
55 | i = block * 1000 | |
56 | end = min(self.l, i + 1000) |
|
56 | end = min(self.l, i + 1000) | |
57 | while i < end: |
|
57 | while i < end: | |
58 | d = self.data[i * self.s: (i + 1) * self.s] |
|
58 | d = self.data[i * self.s: (i + 1) * self.s] | |
59 | e = struct.unpack(indexformat, d) |
|
59 | e = struct.unpack(indexformat, d) | |
60 | self.index[i] = e |
|
60 | self.index[i] = e | |
61 | self.map[e[6]] = i |
|
61 | self.map[e[6]] = i | |
62 | i += 1 |
|
62 | i += 1 | |
63 |
|
63 | |||
64 | class lazyindex: |
|
64 | class lazyindex: | |
65 | def __init__(self, parser): |
|
65 | def __init__(self, parser): | |
66 | self.p = parser |
|
66 | self.p = parser | |
67 | def __len__(self): |
|
67 | def __len__(self): | |
68 | return len(self.p.index) |
|
68 | return len(self.p.index) | |
69 | def load(self, pos): |
|
69 | def load(self, pos): | |
70 | self.p.load(pos) |
|
70 | self.p.load(pos) | |
71 | return self.p.index[pos] |
|
71 | return self.p.index[pos] | |
72 | def __getitem__(self, pos): |
|
72 | def __getitem__(self, pos): | |
73 | return self.p.index[pos] or self.load(pos) |
|
73 | return self.p.index[pos] or self.load(pos) | |
74 | def append(self, e): |
|
74 | def append(self, e): | |
75 | self.p.index.append(e) |
|
75 | self.p.index.append(e) | |
76 |
|
76 | |||
77 | class lazymap: |
|
77 | class lazymap: | |
78 | def __init__(self, parser): |
|
78 | def __init__(self, parser): | |
79 | self.p = parser |
|
79 | self.p = parser | |
80 | def load(self, key): |
|
80 | def load(self, key): | |
81 | n = self.p.data.find(key) |
|
81 | n = self.p.data.find(key) | |
82 | if n < 0: raise KeyError("node " + hex(key)) |
|
82 | if n < 0: raise KeyError("node " + hex(key)) | |
83 | pos = n / self.p.s |
|
83 | pos = n / self.p.s | |
84 | self.p.load(pos) |
|
84 | self.p.load(pos) | |
85 | def __contains__(self, key): |
|
85 | def __contains__(self, key): | |
86 | try: |
|
86 | try: | |
87 | self[key] |
|
87 | self[key] | |
88 | return True |
|
88 | return True | |
89 | except KeyError: |
|
89 | except KeyError: | |
90 | return False |
|
90 | return False | |
91 | def __iter__(self): |
|
91 | def __iter__(self): | |
92 | for i in xrange(self.p.l): |
|
92 | for i in xrange(self.p.l): | |
93 | try: |
|
93 | try: | |
94 | yield self.p.index[i][6] |
|
94 | yield self.p.index[i][6] | |
95 | except: |
|
95 | except: | |
96 | self.p.load(i) |
|
96 | self.p.load(i) | |
97 | yield self.p.index[i][6] |
|
97 | yield self.p.index[i][6] | |
98 | def __getitem__(self, key): |
|
98 | def __getitem__(self, key): | |
99 | try: |
|
99 | try: | |
100 | return self.p.map[key] |
|
100 | return self.p.map[key] | |
101 | except KeyError: |
|
101 | except KeyError: | |
102 | try: |
|
102 | try: | |
103 | self.load(key) |
|
103 | self.load(key) | |
104 | return self.p.map[key] |
|
104 | return self.p.map[key] | |
105 | except KeyError: |
|
105 | except KeyError: | |
106 | raise KeyError("node " + hex(key)) |
|
106 | raise KeyError("node " + hex(key)) | |
107 | def __setitem__(self, key, val): |
|
107 | def __setitem__(self, key, val): | |
108 | self.p.map[key] = val |
|
108 | self.p.map[key] = val | |
109 |
|
109 | |||
110 | class revlog: |
|
110 | class revlog: | |
111 | def __init__(self, opener, indexfile, datafile): |
|
111 | def __init__(self, opener, indexfile, datafile): | |
112 | self.indexfile = indexfile |
|
112 | self.indexfile = indexfile | |
113 | self.datafile = datafile |
|
113 | self.datafile = datafile | |
114 | self.opener = opener |
|
114 | self.opener = opener | |
115 | self.cache = None |
|
115 | self.cache = None | |
116 |
|
116 | |||
117 | try: |
|
117 | try: | |
118 | i = self.opener(self.indexfile).read() |
|
118 | i = self.opener(self.indexfile).read() | |
119 | except IOError: |
|
119 | except IOError: | |
120 | i = "" |
|
120 | i = "" | |
121 |
|
121 | |||
122 | if len(i) > 10000: |
|
122 | if len(i) > 10000: | |
123 | # big index, let's parse it on demand |
|
123 | # big index, let's parse it on demand | |
124 | parser = lazyparser(i) |
|
124 | parser = lazyparser(i) | |
125 | self.index = lazyindex(parser) |
|
125 | self.index = lazyindex(parser) | |
126 | self.nodemap = lazymap(parser) |
|
126 | self.nodemap = lazymap(parser) | |
127 | else: |
|
127 | else: | |
128 | s = struct.calcsize(indexformat) |
|
128 | s = struct.calcsize(indexformat) | |
129 | l = len(i) / s |
|
129 | l = len(i) / s | |
130 | self.index = [None] * l |
|
130 | self.index = [None] * l | |
131 | m = [None] * l |
|
131 | m = [None] * l | |
132 |
|
132 | |||
133 | n = 0 |
|
133 | n = 0 | |
134 | for f in xrange(0, len(i), s): |
|
134 | for f in xrange(0, len(i), s): | |
135 | # offset, size, base, linkrev, p1, p2, nodeid |
|
135 | # offset, size, base, linkrev, p1, p2, nodeid | |
136 | e = struct.unpack(indexformat, i[f:f + s]) |
|
136 | e = struct.unpack(indexformat, i[f:f + s]) | |
137 | m[n] = (e[6], n) |
|
137 | m[n] = (e[6], n) | |
138 | self.index[n] = e |
|
138 | self.index[n] = e | |
139 | n += 1 |
|
139 | n += 1 | |
140 |
|
140 | |||
141 | self.nodemap = dict(m) |
|
141 | self.nodemap = dict(m) | |
142 | self.nodemap[nullid] = -1 |
|
142 | self.nodemap[nullid] = -1 | |
143 |
|
143 | |||
144 |
|
144 | |||
145 | def tip(self): return self.node(len(self.index) - 1) |
|
145 | def tip(self): return self.node(len(self.index) - 1) | |
146 | def count(self): return len(self.index) |
|
146 | def count(self): return len(self.index) | |
147 | def node(self, rev): return (rev < 0) and nullid or self.index[rev][6] |
|
147 | def node(self, rev): return (rev < 0) and nullid or self.index[rev][6] | |
148 | def rev(self, node): return self.nodemap[node] |
|
148 | def rev(self, node): return self.nodemap[node] | |
149 | def linkrev(self, node): return self.index[self.nodemap[node]][3] |
|
149 | def linkrev(self, node): return self.index[self.nodemap[node]][3] | |
150 | def parents(self, node): |
|
150 | def parents(self, node): | |
151 | if node == nullid: return (nullid, nullid) |
|
151 | if node == nullid: return (nullid, nullid) | |
152 | return self.index[self.nodemap[node]][4:6] |
|
152 | return self.index[self.nodemap[node]][4:6] | |
153 |
|
153 | |||
154 | def start(self, rev): return self.index[rev][0] |
|
154 | def start(self, rev): return self.index[rev][0] | |
155 | def length(self, rev): return self.index[rev][1] |
|
155 | def length(self, rev): return self.index[rev][1] | |
156 | def end(self, rev): return self.start(rev) + self.length(rev) |
|
156 | def end(self, rev): return self.start(rev) + self.length(rev) | |
157 | def base(self, rev): return self.index[rev][2] |
|
157 | def base(self, rev): return self.index[rev][2] | |
158 |
|
158 | |||
159 | def heads(self): |
|
159 | def heads(self): | |
160 | p = {} |
|
160 | p = {} | |
161 | h = [] |
|
161 | h = [] | |
162 | for r in range(self.count() - 1, -1, -1): |
|
162 | for r in range(self.count() - 1, -1, -1): | |
163 | n = self.node(r) |
|
163 | n = self.node(r) | |
164 | if n not in p: |
|
164 | if n not in p: | |
165 | h.append(n) |
|
165 | h.append(n) | |
166 | for pn in self.parents(n): |
|
166 | for pn in self.parents(n): | |
167 | p[pn] = 1 |
|
167 | p[pn] = 1 | |
168 | return h |
|
168 | return h | |
169 |
|
169 | |||
170 | def lookup(self, id): |
|
170 | def lookup(self, id): | |
171 | try: |
|
171 | try: | |
172 | rev = int(id) |
|
172 | rev = int(id) | |
173 | return self.node(rev) |
|
173 | return self.node(rev) | |
174 | except ValueError: |
|
174 | except ValueError: | |
175 | c = [] |
|
175 | c = [] | |
176 | for n in self.nodemap: |
|
176 | for n in self.nodemap: | |
177 | if id in hex(n): |
|
177 | if id in hex(n): | |
178 | c.append(n) |
|
178 | c.append(n) | |
179 | if len(c) > 1: raise KeyError("Ambiguous identifier") |
|
179 | if len(c) > 1: raise KeyError("Ambiguous identifier") | |
180 | if len(c) < 1: raise KeyError("No match found") |
|
180 | if len(c) < 1: raise KeyError("No match found") | |
181 | return c[0] |
|
181 | return c[0] | |
182 |
|
182 | |||
183 | return None |
|
183 | return None | |
184 |
|
184 | |||
185 | def diff(self, a, b): |
|
185 | def diff(self, a, b): | |
186 | return mdiff.textdiff(a, b) |
|
186 | return mdiff.textdiff(a, b) | |
187 |
|
187 | |||
188 | def patches(self, t, pl): |
|
188 | def patches(self, t, pl): | |
189 | return mdiff.patches(t, pl) |
|
189 | return mdiff.patches(t, pl) | |
190 |
|
190 | |||
191 | def delta(self, node): |
|
191 | def delta(self, node): | |
192 | r = self.rev(node) |
|
192 | r = self.rev(node) | |
193 | b = self.base(r) |
|
193 | b = self.base(r) | |
194 | if r == b: |
|
194 | if r == b: | |
195 | return self.diff(self.revision(self.node(r - 1)), |
|
195 | return self.diff(self.revision(self.node(r - 1)), | |
196 | self.revision(node)) |
|
196 | self.revision(node)) | |
197 | else: |
|
197 | else: | |
198 | f = self.opener(self.datafile) |
|
198 | f = self.opener(self.datafile) | |
199 | f.seek(self.start(r)) |
|
199 | f.seek(self.start(r)) | |
200 | data = f.read(self.length(r)) |
|
200 | data = f.read(self.length(r)) | |
201 | return decompress(data) |
|
201 | return decompress(data) | |
202 |
|
202 | |||
203 | def revision(self, node): |
|
203 | def revision(self, node): | |
204 | if node == nullid: return "" |
|
204 | if node == nullid: return "" | |
205 | if self.cache and self.cache[0] == node: return self.cache[2] |
|
205 | if self.cache and self.cache[0] == node: return self.cache[2] | |
206 |
|
206 | |||
207 | text = None |
|
207 | text = None | |
208 | rev = self.rev(node) |
|
208 | rev = self.rev(node) | |
209 | start, length, base, link, p1, p2, node = self.index[rev] |
|
209 | start, length, base, link, p1, p2, node = self.index[rev] | |
210 | end = start + length |
|
210 | end = start + length | |
211 | if base != rev: start = self.start(base) |
|
211 | if base != rev: start = self.start(base) | |
212 |
|
212 | |||
213 | if self.cache and self.cache[1] >= base and self.cache[1] < rev: |
|
213 | if self.cache and self.cache[1] >= base and self.cache[1] < rev: | |
214 | base = self.cache[1] |
|
214 | base = self.cache[1] | |
215 | start = self.start(base + 1) |
|
215 | start = self.start(base + 1) | |
216 | text = self.cache[2] |
|
216 | text = self.cache[2] | |
217 | last = 0 |
|
217 | last = 0 | |
218 |
|
218 | |||
219 | f = self.opener(self.datafile) |
|
219 | f = self.opener(self.datafile) | |
220 | f.seek(start) |
|
220 | f.seek(start) | |
221 | data = f.read(end - start) |
|
221 | data = f.read(end - start) | |
222 |
|
222 | |||
223 | if not text: |
|
223 | if not text: | |
224 | last = self.length(base) |
|
224 | last = self.length(base) | |
225 | text = decompress(data[:last]) |
|
225 | text = decompress(data[:last]) | |
226 |
|
226 | |||
227 | bins = [] |
|
227 | bins = [] | |
228 | for r in xrange(base + 1, rev + 1): |
|
228 | for r in xrange(base + 1, rev + 1): | |
229 | s = self.length(r) |
|
229 | s = self.length(r) | |
230 | bins.append(decompress(data[last:last + s])) |
|
230 | bins.append(decompress(data[last:last + s])) | |
231 | last = last + s |
|
231 | last = last + s | |
232 |
|
232 | |||
233 | text = mdiff.patches(text, bins) |
|
233 | text = mdiff.patches(text, bins) | |
234 |
|
234 | |||
235 | if node != hash(text, p1, p2): |
|
235 | if node != hash(text, p1, p2): | |
236 | raise IOError("integrity check failed on %s:%d" |
|
236 | raise IOError("integrity check failed on %s:%d" | |
237 | % (self.datafile, rev)) |
|
237 | % (self.datafile, rev)) | |
238 |
|
238 | |||
239 | self.cache = (node, rev, text) |
|
239 | self.cache = (node, rev, text) | |
240 | return text |
|
240 | return text | |
241 |
|
241 | |||
242 | def addrevision(self, text, transaction, link, p1=None, p2=None): |
|
242 | def addrevision(self, text, transaction, link, p1=None, p2=None): | |
243 | if text is None: text = "" |
|
243 | if text is None: text = "" | |
244 | if p1 is None: p1 = self.tip() |
|
244 | if p1 is None: p1 = self.tip() | |
245 | if p2 is None: p2 = nullid |
|
245 | if p2 is None: p2 = nullid | |
246 |
|
246 | |||
247 | node = hash(text, p1, p2) |
|
247 | node = hash(text, p1, p2) | |
248 |
|
248 | |||
|
249 | if node in self.nodemap: | |||
|
250 | return node | |||
|
251 | ||||
249 | n = self.count() |
|
252 | n = self.count() | |
250 | t = n - 1 |
|
253 | t = n - 1 | |
251 |
|
254 | |||
252 | if n: |
|
255 | if n: | |
253 | base = self.base(t) |
|
256 | base = self.base(t) | |
254 | start = self.start(base) |
|
257 | start = self.start(base) | |
255 | end = self.end(t) |
|
258 | end = self.end(t) | |
256 | prev = self.revision(self.tip()) |
|
259 | prev = self.revision(self.tip()) | |
257 | d = self.diff(prev, text) |
|
260 | d = self.diff(prev, text) | |
258 | data = compress(d) |
|
261 | data = compress(d) | |
259 | dist = end - start + len(data) |
|
262 | dist = end - start + len(data) | |
260 |
|
263 | |||
261 | # full versions are inserted when the needed deltas |
|
264 | # full versions are inserted when the needed deltas | |
262 | # become comparable to the uncompressed text |
|
265 | # become comparable to the uncompressed text | |
263 | if not n or dist > len(text) * 2: |
|
266 | if not n or dist > len(text) * 2: | |
264 | data = compress(text) |
|
267 | data = compress(text) | |
265 | base = n |
|
268 | base = n | |
266 | else: |
|
269 | else: | |
267 | base = self.base(t) |
|
270 | base = self.base(t) | |
268 |
|
271 | |||
269 | offset = 0 |
|
272 | offset = 0 | |
270 | if t >= 0: |
|
273 | if t >= 0: | |
271 | offset = self.end(t) |
|
274 | offset = self.end(t) | |
272 |
|
275 | |||
273 | e = (offset, len(data), base, link, p1, p2, node) |
|
276 | e = (offset, len(data), base, link, p1, p2, node) | |
274 |
|
277 | |||
275 | self.index.append(e) |
|
278 | self.index.append(e) | |
276 | self.nodemap[node] = n |
|
279 | self.nodemap[node] = n | |
277 | entry = struct.pack(indexformat, *e) |
|
280 | entry = struct.pack(indexformat, *e) | |
278 |
|
281 | |||
279 | transaction.add(self.datafile, e[0]) |
|
282 | transaction.add(self.datafile, e[0]) | |
280 | self.opener(self.datafile, "a").write(data) |
|
283 | self.opener(self.datafile, "a").write(data) | |
281 | transaction.add(self.indexfile, n * len(entry)) |
|
284 | transaction.add(self.indexfile, n * len(entry)) | |
282 | self.opener(self.indexfile, "a").write(entry) |
|
285 | self.opener(self.indexfile, "a").write(entry) | |
283 |
|
286 | |||
284 | self.cache = (node, n, text) |
|
287 | self.cache = (node, n, text) | |
285 | return node |
|
288 | return node | |
286 |
|
289 | |||
287 | def ancestor(self, a, b): |
|
290 | def ancestor(self, a, b): | |
288 | # calculate the distance of every node from root |
|
291 | # calculate the distance of every node from root | |
289 | dist = {nullid: 0} |
|
292 | dist = {nullid: 0} | |
290 | for i in xrange(self.count()): |
|
293 | for i in xrange(self.count()): | |
291 | n = self.node(i) |
|
294 | n = self.node(i) | |
292 | p1, p2 = self.parents(n) |
|
295 | p1, p2 = self.parents(n) | |
293 | dist[n] = max(dist[p1], dist[p2]) + 1 |
|
296 | dist[n] = max(dist[p1], dist[p2]) + 1 | |
294 |
|
297 | |||
295 | # traverse ancestors in order of decreasing distance from root |
|
298 | # traverse ancestors in order of decreasing distance from root | |
296 | def ancestors(node): |
|
299 | def ancestors(node): | |
297 | # we store negative distances because heap returns smallest member |
|
300 | # we store negative distances because heap returns smallest member | |
298 | h = [(-dist[node], node)] |
|
301 | h = [(-dist[node], node)] | |
299 | seen = {} |
|
302 | seen = {} | |
300 | earliest = self.count() |
|
303 | earliest = self.count() | |
301 | while h: |
|
304 | while h: | |
302 | d, n = heapq.heappop(h) |
|
305 | d, n = heapq.heappop(h) | |
303 | r = self.rev(n) |
|
306 | r = self.rev(n) | |
304 | if n not in seen: |
|
307 | if n not in seen: | |
305 | seen[n] = 1 |
|
308 | seen[n] = 1 | |
306 | yield (-d, n) |
|
309 | yield (-d, n) | |
307 | for p in self.parents(n): |
|
310 | for p in self.parents(n): | |
308 | heapq.heappush(h, (-dist[p], p)) |
|
311 | heapq.heappush(h, (-dist[p], p)) | |
309 |
|
312 | |||
310 | x = ancestors(a) |
|
313 | x = ancestors(a) | |
311 | y = ancestors(b) |
|
314 | y = ancestors(b) | |
312 | lx = x.next() |
|
315 | lx = x.next() | |
313 | ly = y.next() |
|
316 | ly = y.next() | |
314 |
|
317 | |||
315 | # increment each ancestor list until it is closer to root than |
|
318 | # increment each ancestor list until it is closer to root than | |
316 | # the other, or they match |
|
319 | # the other, or they match | |
317 | while 1: |
|
320 | while 1: | |
318 | if lx == ly: |
|
321 | if lx == ly: | |
319 | return lx[1] |
|
322 | return lx[1] | |
320 | elif lx < ly: |
|
323 | elif lx < ly: | |
321 | ly = y.next() |
|
324 | ly = y.next() | |
322 | elif lx > ly: |
|
325 | elif lx > ly: | |
323 | lx = x.next() |
|
326 | lx = x.next() | |
324 |
|
327 | |||
325 | def group(self, linkmap): |
|
328 | def group(self, linkmap): | |
326 | # given a list of changeset revs, return a set of deltas and |
|
329 | # given a list of changeset revs, return a set of deltas and | |
327 | # metadata corresponding to nodes. the first delta is |
|
330 | # metadata corresponding to nodes. the first delta is | |
328 | # parent(nodes[0]) -> nodes[0] the receiver is guaranteed to |
|
331 | # parent(nodes[0]) -> nodes[0] the receiver is guaranteed to | |
329 | # have this parent as it has all history before these |
|
332 | # have this parent as it has all history before these | |
330 | # changesets. parent is parent[0] |
|
333 | # changesets. parent is parent[0] | |
331 |
|
334 | |||
332 | revs = [] |
|
335 | revs = [] | |
333 | needed = {} |
|
336 | needed = {} | |
334 |
|
337 | |||
335 | # find file nodes/revs that match changeset revs |
|
338 | # find file nodes/revs that match changeset revs | |
336 | for i in xrange(0, self.count()): |
|
339 | for i in xrange(0, self.count()): | |
337 | if self.index[i][3] in linkmap: |
|
340 | if self.index[i][3] in linkmap: | |
338 | revs.append(i) |
|
341 | revs.append(i) | |
339 | needed[i] = 1 |
|
342 | needed[i] = 1 | |
340 |
|
343 | |||
341 | # if we don't have any revisions touched by these changesets, bail |
|
344 | # if we don't have any revisions touched by these changesets, bail | |
342 | if not revs: |
|
345 | if not revs: | |
343 | yield struct.pack(">l", 0) |
|
346 | yield struct.pack(">l", 0) | |
344 | return |
|
347 | return | |
345 |
|
348 | |||
346 | # add the parent of the first rev |
|
349 | # add the parent of the first rev | |
347 | p = self.parents(self.node(revs[0]))[0] |
|
350 | p = self.parents(self.node(revs[0]))[0] | |
348 | revs.insert(0, self.rev(p)) |
|
351 | revs.insert(0, self.rev(p)) | |
349 |
|
352 | |||
350 | # for each delta that isn't contiguous in the log, we need to |
|
353 | # for each delta that isn't contiguous in the log, we need to | |
351 | # reconstruct the base, reconstruct the result, and then |
|
354 | # reconstruct the base, reconstruct the result, and then | |
352 | # calculate the delta. We also need to do this where we've |
|
355 | # calculate the delta. We also need to do this where we've | |
353 | # stored a full version and not a delta |
|
356 | # stored a full version and not a delta | |
354 | for i in xrange(0, len(revs) - 1): |
|
357 | for i in xrange(0, len(revs) - 1): | |
355 | a, b = revs[i], revs[i + 1] |
|
358 | a, b = revs[i], revs[i + 1] | |
356 | if a + 1 != b or self.base(b) == b: |
|
359 | if a + 1 != b or self.base(b) == b: | |
357 | for j in xrange(self.base(a), a + 1): |
|
360 | for j in xrange(self.base(a), a + 1): | |
358 | needed[j] = 1 |
|
361 | needed[j] = 1 | |
359 | for j in xrange(self.base(b), b + 1): |
|
362 | for j in xrange(self.base(b), b + 1): | |
360 | needed[j] = 1 |
|
363 | needed[j] = 1 | |
361 |
|
364 | |||
362 | # calculate spans to retrieve from datafile |
|
365 | # calculate spans to retrieve from datafile | |
363 | needed = needed.keys() |
|
366 | needed = needed.keys() | |
364 | needed.sort() |
|
367 | needed.sort() | |
365 | spans = [] |
|
368 | spans = [] | |
366 | oo = -1 |
|
369 | oo = -1 | |
367 | ol = 0 |
|
370 | ol = 0 | |
368 | for n in needed: |
|
371 | for n in needed: | |
369 | if n < 0: continue |
|
372 | if n < 0: continue | |
370 | o = self.start(n) |
|
373 | o = self.start(n) | |
371 | l = self.length(n) |
|
374 | l = self.length(n) | |
372 | if oo + ol == o: # can we merge with the previous? |
|
375 | if oo + ol == o: # can we merge with the previous? | |
373 | nl = spans[-1][2] |
|
376 | nl = spans[-1][2] | |
374 | nl.append((n, l)) |
|
377 | nl.append((n, l)) | |
375 | ol += l |
|
378 | ol += l | |
376 | spans[-1] = (oo, ol, nl) |
|
379 | spans[-1] = (oo, ol, nl) | |
377 | else: |
|
380 | else: | |
378 | oo = o |
|
381 | oo = o | |
379 | ol = l |
|
382 | ol = l | |
380 | spans.append((oo, ol, [(n, l)])) |
|
383 | spans.append((oo, ol, [(n, l)])) | |
381 |
|
384 | |||
382 | # read spans in, divide up chunks |
|
385 | # read spans in, divide up chunks | |
383 | chunks = {} |
|
386 | chunks = {} | |
384 | for span in spans: |
|
387 | for span in spans: | |
385 | # we reopen the file for each span to make http happy for now |
|
388 | # we reopen the file for each span to make http happy for now | |
386 | f = self.opener(self.datafile) |
|
389 | f = self.opener(self.datafile) | |
387 | f.seek(span[0]) |
|
390 | f.seek(span[0]) | |
388 | data = f.read(span[1]) |
|
391 | data = f.read(span[1]) | |
389 |
|
392 | |||
390 | # divide up the span |
|
393 | # divide up the span | |
391 | pos = 0 |
|
394 | pos = 0 | |
392 | for r, l in span[2]: |
|
395 | for r, l in span[2]: | |
393 | chunks[r] = decompress(data[pos: pos + l]) |
|
396 | chunks[r] = decompress(data[pos: pos + l]) | |
394 | pos += l |
|
397 | pos += l | |
395 |
|
398 | |||
396 | # helper to reconstruct intermediate versions |
|
399 | # helper to reconstruct intermediate versions | |
397 | def construct(text, base, rev): |
|
400 | def construct(text, base, rev): | |
398 | bins = [chunks[r] for r in xrange(base + 1, rev + 1)] |
|
401 | bins = [chunks[r] for r in xrange(base + 1, rev + 1)] | |
399 | return mdiff.patches(text, bins) |
|
402 | return mdiff.patches(text, bins) | |
400 |
|
403 | |||
401 | # build deltas |
|
404 | # build deltas | |
402 | deltas = [] |
|
405 | deltas = [] | |
403 | for d in xrange(0, len(revs) - 1): |
|
406 | for d in xrange(0, len(revs) - 1): | |
404 | a, b = revs[d], revs[d + 1] |
|
407 | a, b = revs[d], revs[d + 1] | |
405 | n = self.node(b) |
|
408 | n = self.node(b) | |
406 |
|
409 | |||
407 | # do we need to construct a new delta? |
|
410 | # do we need to construct a new delta? | |
408 | if a + 1 != b or self.base(b) == b: |
|
411 | if a + 1 != b or self.base(b) == b: | |
409 | if a >= 0: |
|
412 | if a >= 0: | |
410 | base = self.base(a) |
|
413 | base = self.base(a) | |
411 | ta = chunks[self.base(a)] |
|
414 | ta = chunks[self.base(a)] | |
412 | ta = construct(ta, base, a) |
|
415 | ta = construct(ta, base, a) | |
413 | else: |
|
416 | else: | |
414 | ta = "" |
|
417 | ta = "" | |
415 |
|
418 | |||
416 | base = self.base(b) |
|
419 | base = self.base(b) | |
417 | if a > base: |
|
420 | if a > base: | |
418 | base = a |
|
421 | base = a | |
419 | tb = ta |
|
422 | tb = ta | |
420 | else: |
|
423 | else: | |
421 | tb = chunks[self.base(b)] |
|
424 | tb = chunks[self.base(b)] | |
422 | tb = construct(tb, base, b) |
|
425 | tb = construct(tb, base, b) | |
423 | d = self.diff(ta, tb) |
|
426 | d = self.diff(ta, tb) | |
424 | else: |
|
427 | else: | |
425 | d = chunks[b] |
|
428 | d = chunks[b] | |
426 |
|
429 | |||
427 | p = self.parents(n) |
|
430 | p = self.parents(n) | |
428 | meta = n + p[0] + p[1] + linkmap[self.linkrev(n)] |
|
431 | meta = n + p[0] + p[1] + linkmap[self.linkrev(n)] | |
429 | l = struct.pack(">l", len(meta) + len(d) + 4) |
|
432 | l = struct.pack(">l", len(meta) + len(d) + 4) | |
430 | yield l |
|
433 | yield l | |
431 | yield meta |
|
434 | yield meta | |
432 | yield d |
|
435 | yield d | |
433 |
|
436 | |||
434 | yield struct.pack(">l", 0) |
|
437 | yield struct.pack(">l", 0) | |
435 |
|
438 | |||
436 | def addgroup(self, revs, linkmapper, transaction, unique = 0): |
|
439 | def addgroup(self, revs, linkmapper, transaction, unique = 0): | |
437 | # given a set of deltas, add them to the revision log. the |
|
440 | # given a set of deltas, add them to the revision log. the | |
438 | # first delta is against its parent, which should be in our |
|
441 | # first delta is against its parent, which should be in our | |
439 | # log, the rest are against the previous delta. |
|
442 | # log, the rest are against the previous delta. | |
440 |
|
443 | |||
441 | # track the base of the current delta log |
|
444 | # track the base of the current delta log | |
442 | r = self.count() |
|
445 | r = self.count() | |
443 | t = r - 1 |
|
446 | t = r - 1 | |
444 | node = nullid |
|
447 | node = nullid | |
445 |
|
448 | |||
446 | base = prev = -1 |
|
449 | base = prev = -1 | |
447 | start = end = 0 |
|
450 | start = end = 0 | |
448 | if r: |
|
451 | if r: | |
449 | start = self.start(self.base(t)) |
|
452 | start = self.start(self.base(t)) | |
450 | end = self.end(t) |
|
453 | end = self.end(t) | |
451 | measure = self.length(self.base(t)) |
|
454 | measure = self.length(self.base(t)) | |
452 | base = self.base(t) |
|
455 | base = self.base(t) | |
453 | prev = self.tip() |
|
456 | prev = self.tip() | |
454 |
|
457 | |||
455 | transaction.add(self.datafile, end) |
|
458 | transaction.add(self.datafile, end) | |
456 | transaction.add(self.indexfile, r * struct.calcsize(indexformat)) |
|
459 | transaction.add(self.indexfile, r * struct.calcsize(indexformat)) | |
457 | dfh = self.opener(self.datafile, "a") |
|
460 | dfh = self.opener(self.datafile, "a") | |
458 | ifh = self.opener(self.indexfile, "a") |
|
461 | ifh = self.opener(self.indexfile, "a") | |
459 |
|
462 | |||
460 | # loop through our set of deltas |
|
463 | # loop through our set of deltas | |
461 | chain = None |
|
464 | chain = None | |
462 | for chunk in revs: |
|
465 | for chunk in revs: | |
463 | node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) |
|
466 | node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) | |
464 | link = linkmapper(cs) |
|
467 | link = linkmapper(cs) | |
465 | if node in self.nodemap: |
|
468 | if node in self.nodemap: | |
466 | # this can happen if two branches make the same change |
|
469 | # this can happen if two branches make the same change | |
467 | if unique: |
|
470 | if unique: | |
468 | raise "already have %s" % hex(node[:4]) |
|
471 | raise "already have %s" % hex(node[:4]) | |
469 | continue |
|
472 | continue | |
470 | delta = chunk[80:] |
|
473 | delta = chunk[80:] | |
471 |
|
474 | |||
472 | if not chain: |
|
475 | if not chain: | |
473 | # retrieve the parent revision of the delta chain |
|
476 | # retrieve the parent revision of the delta chain | |
474 | chain = p1 |
|
477 | chain = p1 | |
475 | if not chain in self.nodemap: |
|
478 | if not chain in self.nodemap: | |
476 | raise "unknown base %s" % short(chain[:4]) |
|
479 | raise "unknown base %s" % short(chain[:4]) | |
477 |
|
480 | |||
478 | # full versions are inserted when the needed deltas become |
|
481 | # full versions are inserted when the needed deltas become | |
479 | # comparable to the uncompressed text or when the previous |
|
482 | # comparable to the uncompressed text or when the previous | |
480 | # version is not the one we have a delta against. We use |
|
483 | # version is not the one we have a delta against. We use | |
481 | # the size of the previous full rev as a proxy for the |
|
484 | # the size of the previous full rev as a proxy for the | |
482 | # current size. |
|
485 | # current size. | |
483 |
|
486 | |||
484 | if chain == prev: |
|
487 | if chain == prev: | |
485 | cdelta = compress(delta) |
|
488 | cdelta = compress(delta) | |
486 |
|
489 | |||
487 | if chain != prev or (end - start + len(cdelta)) > measure * 2: |
|
490 | if chain != prev or (end - start + len(cdelta)) > measure * 2: | |
488 | # flush our writes here so we can read it in revision |
|
491 | # flush our writes here so we can read it in revision | |
489 | dfh.flush() |
|
492 | dfh.flush() | |
490 | ifh.flush() |
|
493 | ifh.flush() | |
491 | text = self.revision(chain) |
|
494 | text = self.revision(chain) | |
492 | text = self.patches(text, [delta]) |
|
495 | text = self.patches(text, [delta]) | |
493 | chk = self.addrevision(text, transaction, link, p1, p2) |
|
496 | chk = self.addrevision(text, transaction, link, p1, p2) | |
494 | if chk != node: |
|
497 | if chk != node: | |
495 | raise "consistency error adding group" |
|
498 | raise "consistency error adding group" | |
496 | measure = len(text) |
|
499 | measure = len(text) | |
497 | else: |
|
500 | else: | |
498 | e = (end, len(cdelta), self.base(t), link, p1, p2, node) |
|
501 | e = (end, len(cdelta), self.base(t), link, p1, p2, node) | |
499 | self.index.append(e) |
|
502 | self.index.append(e) | |
500 | self.nodemap[node] = r |
|
503 | self.nodemap[node] = r | |
501 | dfh.write(cdelta) |
|
504 | dfh.write(cdelta) | |
502 | ifh.write(struct.pack(indexformat, *e)) |
|
505 | ifh.write(struct.pack(indexformat, *e)) | |
503 |
|
506 | |||
504 | t, r, chain, prev = r, r + 1, node, node |
|
507 | t, r, chain, prev = r, r + 1, node, node | |
505 | start = self.start(self.base(t)) |
|
508 | start = self.start(self.base(t)) | |
506 | end = self.end(t) |
|
509 | end = self.end(t) | |
507 |
|
510 | |||
508 | dfh.close() |
|
511 | dfh.close() | |
509 | ifh.close() |
|
512 | ifh.close() | |
510 | return node |
|
513 | return node |
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