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@@ -1,869 +1,870 | |||||
1 | """ |
|
1 | """ | |
2 | revlog.py - storage back-end for mercurial |
|
2 | revlog.py - storage back-end for mercurial | |
3 |
|
3 | |||
4 | This provides efficient delta storage with O(1) retrieve and append |
|
4 | This provides efficient delta storage with O(1) retrieve and append | |
5 | and O(changes) merge between branches |
|
5 | and O(changes) merge between branches | |
6 |
|
6 | |||
7 | Copyright 2005 Matt Mackall <mpm@selenic.com> |
|
7 | Copyright 2005 Matt Mackall <mpm@selenic.com> | |
8 |
|
8 | |||
9 | This software may be used and distributed according to the terms |
|
9 | This software may be used and distributed according to the terms | |
10 | of the GNU General Public License, incorporated herein by reference. |
|
10 | of the GNU General Public License, incorporated herein by reference. | |
11 | """ |
|
11 | """ | |
12 |
|
12 | |||
13 | from node import * |
|
13 | from node import * | |
14 | from i18n import gettext as _ |
|
14 | from i18n import gettext as _ | |
15 | from demandload import demandload |
|
15 | from demandload import demandload | |
16 | demandload(globals(), "binascii errno heapq mdiff sha struct zlib") |
|
16 | demandload(globals(), "binascii errno heapq mdiff sha struct zlib") | |
17 |
|
17 | |||
18 | def hash(text, p1, p2): |
|
18 | def hash(text, p1, p2): | |
19 | """generate a hash from the given text and its parent hashes |
|
19 | """generate a hash from the given text and its parent hashes | |
20 |
|
20 | |||
21 | This hash combines both the current file contents and its history |
|
21 | This hash combines both the current file contents and its history | |
22 | in a manner that makes it easy to distinguish nodes with the same |
|
22 | in a manner that makes it easy to distinguish nodes with the same | |
23 | content in the revision graph. |
|
23 | content in the revision graph. | |
24 | """ |
|
24 | """ | |
25 | l = [p1, p2] |
|
25 | l = [p1, p2] | |
26 | l.sort() |
|
26 | l.sort() | |
27 | s = sha.new(l[0]) |
|
27 | s = sha.new(l[0]) | |
28 | s.update(l[1]) |
|
28 | s.update(l[1]) | |
29 | s.update(text) |
|
29 | s.update(text) | |
30 | return s.digest() |
|
30 | return s.digest() | |
31 |
|
31 | |||
32 | def compress(text): |
|
32 | def compress(text): | |
33 | """ generate a possibly-compressed representation of text """ |
|
33 | """ generate a possibly-compressed representation of text """ | |
34 | if not text: return ("", text) |
|
34 | if not text: return ("", text) | |
35 | if len(text) < 44: |
|
35 | if len(text) < 44: | |
36 | if text[0] == '\0': return ("", text) |
|
36 | if text[0] == '\0': return ("", text) | |
37 | return ('u', text) |
|
37 | return ('u', text) | |
38 | bin = zlib.compress(text) |
|
38 | bin = zlib.compress(text) | |
39 | if len(bin) > len(text): |
|
39 | if len(bin) > len(text): | |
40 | if text[0] == '\0': return ("", text) |
|
40 | if text[0] == '\0': return ("", text) | |
41 | return ('u', text) |
|
41 | return ('u', text) | |
42 | return ("", bin) |
|
42 | return ("", bin) | |
43 |
|
43 | |||
44 | def decompress(bin): |
|
44 | def decompress(bin): | |
45 | """ decompress the given input """ |
|
45 | """ decompress the given input """ | |
46 | if not bin: return bin |
|
46 | if not bin: return bin | |
47 | t = bin[0] |
|
47 | t = bin[0] | |
48 | if t == '\0': return bin |
|
48 | if t == '\0': return bin | |
49 | if t == 'x': return zlib.decompress(bin) |
|
49 | if t == 'x': return zlib.decompress(bin) | |
50 | if t == 'u': return bin[1:] |
|
50 | if t == 'u': return bin[1:] | |
51 | raise RevlogError(_("unknown compression type %s") % t) |
|
51 | raise RevlogError(_("unknown compression type %s") % t) | |
52 |
|
52 | |||
53 | indexformat = ">4l20s20s20s" |
|
53 | indexformat = ">4l20s20s20s" | |
54 |
|
54 | |||
55 | class lazyparser(object): |
|
55 | class lazyparser(object): | |
56 | """ |
|
56 | """ | |
57 | this class avoids the need to parse the entirety of large indices |
|
57 | this class avoids the need to parse the entirety of large indices | |
58 |
|
58 | |||
59 | By default we parse and load 1000 entries at a time. |
|
59 | By default we parse and load 1000 entries at a time. | |
60 |
|
60 | |||
61 | If no position is specified, we load the whole index, and replace |
|
61 | If no position is specified, we load the whole index, and replace | |
62 | the lazy objects in revlog with the underlying objects for |
|
62 | the lazy objects in revlog with the underlying objects for | |
63 | efficiency in cases where we look at most of the nodes. |
|
63 | efficiency in cases where we look at most of the nodes. | |
64 | """ |
|
64 | """ | |
65 | def __init__(self, data, revlog): |
|
65 | def __init__(self, data, revlog): | |
66 | self.data = data |
|
66 | self.data = data | |
67 | self.s = struct.calcsize(indexformat) |
|
67 | self.s = struct.calcsize(indexformat) | |
68 | self.l = len(data)/self.s |
|
68 | self.l = len(data)/self.s | |
69 | self.index = [None] * self.l |
|
69 | self.index = [None] * self.l | |
70 | self.map = {nullid: -1} |
|
70 | self.map = {nullid: -1} | |
71 | self.all = 0 |
|
71 | self.all = 0 | |
72 | self.revlog = revlog |
|
72 | self.revlog = revlog | |
73 |
|
73 | |||
74 | def trunc(self, pos): |
|
74 | def trunc(self, pos): | |
75 | self.l = pos/self.s |
|
75 | self.l = pos/self.s | |
76 |
|
76 | |||
77 | def load(self, pos=None): |
|
77 | def load(self, pos=None): | |
78 | if self.all: return |
|
78 | if self.all: return | |
79 | if pos is not None: |
|
79 | if pos is not None: | |
80 | block = pos / 1000 |
|
80 | block = pos / 1000 | |
81 | i = block * 1000 |
|
81 | i = block * 1000 | |
82 | end = min(self.l, i + 1000) |
|
82 | end = min(self.l, i + 1000) | |
83 | else: |
|
83 | else: | |
84 | self.all = 1 |
|
84 | self.all = 1 | |
85 | i = 0 |
|
85 | i = 0 | |
86 | end = self.l |
|
86 | end = self.l | |
87 | self.revlog.index = self.index |
|
87 | self.revlog.index = self.index | |
88 | self.revlog.nodemap = self.map |
|
88 | self.revlog.nodemap = self.map | |
89 |
|
89 | |||
90 | while i < end: |
|
90 | while i < end: | |
91 | d = self.data[i * self.s: (i + 1) * self.s] |
|
91 | d = self.data[i * self.s: (i + 1) * self.s] | |
92 | e = struct.unpack(indexformat, d) |
|
92 | e = struct.unpack(indexformat, d) | |
93 | self.index[i] = e |
|
93 | self.index[i] = e | |
94 | self.map[e[6]] = i |
|
94 | self.map[e[6]] = i | |
95 | i += 1 |
|
95 | i += 1 | |
96 |
|
96 | |||
97 | class lazyindex(object): |
|
97 | class lazyindex(object): | |
98 | """a lazy version of the index array""" |
|
98 | """a lazy version of the index array""" | |
99 | def __init__(self, parser): |
|
99 | def __init__(self, parser): | |
100 | self.p = parser |
|
100 | self.p = parser | |
101 | def __len__(self): |
|
101 | def __len__(self): | |
102 | return len(self.p.index) |
|
102 | return len(self.p.index) | |
103 | def load(self, pos): |
|
103 | def load(self, pos): | |
104 | if pos < 0: |
|
104 | if pos < 0: | |
105 | pos += len(self.p.index) |
|
105 | pos += len(self.p.index) | |
106 | self.p.load(pos) |
|
106 | self.p.load(pos) | |
107 | return self.p.index[pos] |
|
107 | return self.p.index[pos] | |
108 | def __getitem__(self, pos): |
|
108 | def __getitem__(self, pos): | |
109 | return self.p.index[pos] or self.load(pos) |
|
109 | return self.p.index[pos] or self.load(pos) | |
110 | def __delitem__(self, pos): |
|
110 | def __delitem__(self, pos): | |
111 | del self.p.index[pos] |
|
111 | del self.p.index[pos] | |
112 | def append(self, e): |
|
112 | def append(self, e): | |
113 | self.p.index.append(e) |
|
113 | self.p.index.append(e) | |
114 | def trunc(self, pos): |
|
114 | def trunc(self, pos): | |
115 | self.p.trunc(pos) |
|
115 | self.p.trunc(pos) | |
116 |
|
116 | |||
117 | class lazymap(object): |
|
117 | class lazymap(object): | |
118 | """a lazy version of the node map""" |
|
118 | """a lazy version of the node map""" | |
119 | def __init__(self, parser): |
|
119 | def __init__(self, parser): | |
120 | self.p = parser |
|
120 | self.p = parser | |
121 | def load(self, key): |
|
121 | def load(self, key): | |
122 | if self.p.all: return |
|
122 | if self.p.all: return | |
123 | n = self.p.data.find(key) |
|
123 | n = self.p.data.find(key) | |
124 | if n < 0: |
|
124 | if n < 0: | |
125 | raise KeyError(key) |
|
125 | raise KeyError(key) | |
126 | pos = n / self.p.s |
|
126 | pos = n / self.p.s | |
127 | self.p.load(pos) |
|
127 | self.p.load(pos) | |
128 | def __contains__(self, key): |
|
128 | def __contains__(self, key): | |
129 | self.p.load() |
|
129 | self.p.load() | |
130 | return key in self.p.map |
|
130 | return key in self.p.map | |
131 | def __iter__(self): |
|
131 | def __iter__(self): | |
132 | yield nullid |
|
132 | yield nullid | |
133 | for i in xrange(self.p.l): |
|
133 | for i in xrange(self.p.l): | |
134 | try: |
|
134 | try: | |
135 | yield self.p.index[i][6] |
|
135 | yield self.p.index[i][6] | |
136 | except: |
|
136 | except: | |
137 | self.p.load(i) |
|
137 | self.p.load(i) | |
138 | yield self.p.index[i][6] |
|
138 | yield self.p.index[i][6] | |
139 | def __getitem__(self, key): |
|
139 | def __getitem__(self, key): | |
140 | try: |
|
140 | try: | |
141 | return self.p.map[key] |
|
141 | return self.p.map[key] | |
142 | except KeyError: |
|
142 | except KeyError: | |
143 | try: |
|
143 | try: | |
144 | self.load(key) |
|
144 | self.load(key) | |
145 | return self.p.map[key] |
|
145 | return self.p.map[key] | |
146 | except KeyError: |
|
146 | except KeyError: | |
147 | raise KeyError("node " + hex(key)) |
|
147 | raise KeyError("node " + hex(key)) | |
148 | def __setitem__(self, key, val): |
|
148 | def __setitem__(self, key, val): | |
149 | self.p.map[key] = val |
|
149 | self.p.map[key] = val | |
150 | def __delitem__(self, key): |
|
150 | def __delitem__(self, key): | |
151 | del self.p.map[key] |
|
151 | del self.p.map[key] | |
152 |
|
152 | |||
153 | class RevlogError(Exception): pass |
|
153 | class RevlogError(Exception): pass | |
154 |
|
154 | |||
155 | class revlog(object): |
|
155 | class revlog(object): | |
156 | """ |
|
156 | """ | |
157 | the underlying revision storage object |
|
157 | the underlying revision storage object | |
158 |
|
158 | |||
159 | A revlog consists of two parts, an index and the revision data. |
|
159 | A revlog consists of two parts, an index and the revision data. | |
160 |
|
160 | |||
161 | The index is a file with a fixed record size containing |
|
161 | The index is a file with a fixed record size containing | |
162 | information on each revision, includings its nodeid (hash), the |
|
162 | information on each revision, includings its nodeid (hash), the | |
163 | nodeids of its parents, the position and offset of its data within |
|
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 |
|
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 |
|
165 | contains a linkrev entry that can serve as a pointer to external | |
166 | data. |
|
166 | data. | |
167 |
|
167 | |||
168 | The revision data itself is a linear collection of data chunks. |
|
168 | The revision data itself is a linear collection of data chunks. | |
169 | Each chunk represents a revision and is usually represented as a |
|
169 | Each chunk represents a revision and is usually represented as a | |
170 | delta against the previous chunk. To bound lookup time, runs of |
|
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 |
|
171 | deltas are limited to about 2 times the length of the original | |
172 | version data. This makes retrieval of a version proportional to |
|
172 | version data. This makes retrieval of a version proportional to | |
173 | its size, or O(1) relative to the number of revisions. |
|
173 | its size, or O(1) relative to the number of revisions. | |
174 |
|
174 | |||
175 | Both pieces of the revlog are written to in an append-only |
|
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 |
|
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 |
|
177 | remove data, and can use some simple techniques to avoid the need | |
178 | for locking while reading. |
|
178 | for locking while reading. | |
179 | """ |
|
179 | """ | |
180 | def __init__(self, opener, indexfile, datafile): |
|
180 | def __init__(self, opener, indexfile, datafile): | |
181 | """ |
|
181 | """ | |
182 | create a revlog object |
|
182 | create a revlog object | |
183 |
|
183 | |||
184 | opener is a function that abstracts the file opening operation |
|
184 | opener is a function that abstracts the file opening operation | |
185 | and can be used to implement COW semantics or the like. |
|
185 | and can be used to implement COW semantics or the like. | |
186 | """ |
|
186 | """ | |
187 | self.indexfile = indexfile |
|
187 | self.indexfile = indexfile | |
188 | self.datafile = datafile |
|
188 | self.datafile = datafile | |
189 | self.opener = opener |
|
189 | self.opener = opener | |
190 | self.cache = None |
|
190 | self.cache = None | |
191 | self.chunkcache = None |
|
191 | self.chunkcache = None | |
192 |
|
192 | |||
193 | try: |
|
193 | try: | |
194 | i = self.opener(self.indexfile).read() |
|
194 | i = self.opener(self.indexfile).read() | |
195 | except IOError, inst: |
|
195 | except IOError, inst: | |
196 | if inst.errno != errno.ENOENT: |
|
196 | if inst.errno != errno.ENOENT: | |
197 | raise |
|
197 | raise | |
198 | i = "" |
|
198 | i = "" | |
199 |
|
199 | |||
200 | if i and i[:4] != "\0\0\0\0": |
|
200 | if i and i[:4] != "\0\0\0\0": | |
201 | raise RevlogError(_("incompatible revlog signature on %s") % |
|
201 | raise RevlogError(_("incompatible revlog signature on %s") % | |
202 | self.indexfile) |
|
202 | self.indexfile) | |
203 |
|
203 | |||
204 | if len(i) > 10000: |
|
204 | if len(i) > 10000: | |
205 | # big index, let's parse it on demand |
|
205 | # big index, let's parse it on demand | |
206 | parser = lazyparser(i, self) |
|
206 | parser = lazyparser(i, self) | |
207 | self.index = lazyindex(parser) |
|
207 | self.index = lazyindex(parser) | |
208 | self.nodemap = lazymap(parser) |
|
208 | self.nodemap = lazymap(parser) | |
209 | else: |
|
209 | else: | |
210 | s = struct.calcsize(indexformat) |
|
210 | s = struct.calcsize(indexformat) | |
211 | l = len(i) / s |
|
211 | l = len(i) / s | |
212 | self.index = [None] * l |
|
212 | self.index = [None] * l | |
213 | m = [None] * l |
|
213 | m = [None] * l | |
214 |
|
214 | |||
215 | n = 0 |
|
215 | n = 0 | |
216 | for f in xrange(0, l * s, s): |
|
216 | for f in xrange(0, l * s, s): | |
217 | # offset, size, base, linkrev, p1, p2, nodeid |
|
217 | # offset, size, base, linkrev, p1, p2, nodeid | |
218 | e = struct.unpack(indexformat, i[f:f + s]) |
|
218 | e = struct.unpack(indexformat, i[f:f + s]) | |
219 | m[n] = (e[6], n) |
|
219 | m[n] = (e[6], n) | |
220 | self.index[n] = e |
|
220 | self.index[n] = e | |
221 | n += 1 |
|
221 | n += 1 | |
222 |
|
222 | |||
223 | self.nodemap = dict(m) |
|
223 | self.nodemap = dict(m) | |
224 | self.nodemap[nullid] = -1 |
|
224 | self.nodemap[nullid] = -1 | |
225 |
|
225 | |||
226 | def tip(self): return self.node(len(self.index) - 1) |
|
226 | def tip(self): return self.node(len(self.index) - 1) | |
227 | def count(self): return len(self.index) |
|
227 | def count(self): return len(self.index) | |
228 | def node(self, rev): return (rev < 0) and nullid or self.index[rev][6] |
|
228 | def node(self, rev): return (rev < 0) and nullid or self.index[rev][6] | |
229 | def rev(self, node): |
|
229 | def rev(self, node): | |
230 | try: |
|
230 | try: | |
231 | return self.nodemap[node] |
|
231 | return self.nodemap[node] | |
232 | except KeyError: |
|
232 | except KeyError: | |
233 | raise RevlogError(_('%s: no node %s') % (self.indexfile, hex(node))) |
|
233 | raise RevlogError(_('%s: no node %s') % (self.indexfile, hex(node))) | |
234 | def linkrev(self, node): return self.index[self.rev(node)][3] |
|
234 | def linkrev(self, node): return self.index[self.rev(node)][3] | |
235 | def parents(self, node): |
|
235 | def parents(self, node): | |
236 | if node == nullid: return (nullid, nullid) |
|
236 | if node == nullid: return (nullid, nullid) | |
237 | return self.index[self.rev(node)][4:6] |
|
237 | return self.index[self.rev(node)][4:6] | |
238 |
|
238 | |||
239 | def start(self, rev): return self.index[rev][0] |
|
239 | def start(self, rev): return self.index[rev][0] | |
240 | def length(self, rev): return self.index[rev][1] |
|
240 | def length(self, rev): return self.index[rev][1] | |
241 | def end(self, rev): return self.start(rev) + self.length(rev) |
|
241 | def end(self, rev): return self.start(rev) + self.length(rev) | |
242 | def base(self, rev): return self.index[rev][2] |
|
242 | def base(self, rev): return self.index[rev][2] | |
243 |
|
243 | |||
244 | def reachable(self, rev, stop=None): |
|
244 | def reachable(self, rev, stop=None): | |
245 | reachable = {} |
|
245 | reachable = {} | |
246 | visit = [rev] |
|
246 | visit = [rev] | |
247 | reachable[rev] = 1 |
|
247 | reachable[rev] = 1 | |
248 | if stop: |
|
248 | if stop: | |
249 | stopn = self.rev(stop) |
|
249 | stopn = self.rev(stop) | |
250 | else: |
|
250 | else: | |
251 | stopn = 0 |
|
251 | stopn = 0 | |
252 | while visit: |
|
252 | while visit: | |
253 | n = visit.pop(0) |
|
253 | n = visit.pop(0) | |
254 | if n == stop: |
|
254 | if n == stop: | |
255 | continue |
|
255 | continue | |
256 | if n == nullid: |
|
256 | if n == nullid: | |
257 | continue |
|
257 | continue | |
258 | for p in self.parents(n): |
|
258 | for p in self.parents(n): | |
259 | if self.rev(p) < stopn: |
|
259 | if self.rev(p) < stopn: | |
260 | continue |
|
260 | continue | |
261 | if p not in reachable: |
|
261 | if p not in reachable: | |
262 | reachable[p] = 1 |
|
262 | reachable[p] = 1 | |
263 | visit.append(p) |
|
263 | visit.append(p) | |
264 | return reachable |
|
264 | return reachable | |
265 |
|
265 | |||
266 | def nodesbetween(self, roots=None, heads=None): |
|
266 | def nodesbetween(self, roots=None, heads=None): | |
267 | """Return a tuple containing three elements. Elements 1 and 2 contain |
|
267 | """Return a tuple containing three elements. Elements 1 and 2 contain | |
268 | a final list bases and heads after all the unreachable ones have been |
|
268 | a final list bases and heads after all the unreachable ones have been | |
269 | pruned. Element 0 contains a topologically sorted list of all |
|
269 | pruned. Element 0 contains a topologically sorted list of all | |
270 |
|
270 | |||
271 | nodes that satisfy these constraints: |
|
271 | nodes that satisfy these constraints: | |
272 | 1. All nodes must be descended from a node in roots (the nodes on |
|
272 | 1. All nodes must be descended from a node in roots (the nodes on | |
273 | roots are considered descended from themselves). |
|
273 | roots are considered descended from themselves). | |
274 | 2. All nodes must also be ancestors of a node in heads (the nodes in |
|
274 | 2. All nodes must also be ancestors of a node in heads (the nodes in | |
275 | heads are considered to be their own ancestors). |
|
275 | heads are considered to be their own ancestors). | |
276 |
|
276 | |||
277 | If roots is unspecified, nullid is assumed as the only root. |
|
277 | If roots is unspecified, nullid is assumed as the only root. | |
278 | If heads is unspecified, it is taken to be the output of the |
|
278 | If heads is unspecified, it is taken to be the output of the | |
279 | heads method (i.e. a list of all nodes in the repository that |
|
279 | heads method (i.e. a list of all nodes in the repository that | |
280 | have no children).""" |
|
280 | have no children).""" | |
281 | nonodes = ([], [], []) |
|
281 | nonodes = ([], [], []) | |
282 | if roots is not None: |
|
282 | if roots is not None: | |
283 | roots = list(roots) |
|
283 | roots = list(roots) | |
284 | if not roots: |
|
284 | if not roots: | |
285 | return nonodes |
|
285 | return nonodes | |
286 | lowestrev = min([self.rev(n) for n in roots]) |
|
286 | lowestrev = min([self.rev(n) for n in roots]) | |
287 | else: |
|
287 | else: | |
288 | roots = [nullid] # Everybody's a descendent of nullid |
|
288 | roots = [nullid] # Everybody's a descendent of nullid | |
289 | lowestrev = -1 |
|
289 | lowestrev = -1 | |
290 | if (lowestrev == -1) and (heads is None): |
|
290 | if (lowestrev == -1) and (heads is None): | |
291 | # We want _all_ the nodes! |
|
291 | # We want _all_ the nodes! | |
292 | return ([self.node(r) for r in xrange(0, self.count())], |
|
292 | return ([self.node(r) for r in xrange(0, self.count())], | |
293 | [nullid], list(self.heads())) |
|
293 | [nullid], list(self.heads())) | |
294 | if heads is None: |
|
294 | if heads is None: | |
295 | # All nodes are ancestors, so the latest ancestor is the last |
|
295 | # All nodes are ancestors, so the latest ancestor is the last | |
296 | # node. |
|
296 | # node. | |
297 | highestrev = self.count() - 1 |
|
297 | highestrev = self.count() - 1 | |
298 | # Set ancestors to None to signal that every node is an ancestor. |
|
298 | # Set ancestors to None to signal that every node is an ancestor. | |
299 | ancestors = None |
|
299 | ancestors = None | |
300 | # Set heads to an empty dictionary for later discovery of heads |
|
300 | # Set heads to an empty dictionary for later discovery of heads | |
301 | heads = {} |
|
301 | heads = {} | |
302 | else: |
|
302 | else: | |
303 | heads = list(heads) |
|
303 | heads = list(heads) | |
304 | if not heads: |
|
304 | if not heads: | |
305 | return nonodes |
|
305 | return nonodes | |
306 | ancestors = {} |
|
306 | ancestors = {} | |
307 | # Start at the top and keep marking parents until we're done. |
|
307 | # Start at the top and keep marking parents until we're done. | |
308 | nodestotag = heads[:] |
|
308 | nodestotag = heads[:] | |
309 | # Turn heads into a dictionary so we can remove 'fake' heads. |
|
309 | # Turn heads into a dictionary so we can remove 'fake' heads. | |
310 | # Also, later we will be using it to filter out the heads we can't |
|
310 | # Also, later we will be using it to filter out the heads we can't | |
311 | # find from roots. |
|
311 | # find from roots. | |
312 | heads = dict.fromkeys(heads, 0) |
|
312 | heads = dict.fromkeys(heads, 0) | |
313 | # Remember where the top was so we can use it as a limit later. |
|
313 | # Remember where the top was so we can use it as a limit later. | |
314 | highestrev = max([self.rev(n) for n in nodestotag]) |
|
314 | highestrev = max([self.rev(n) for n in nodestotag]) | |
315 | while nodestotag: |
|
315 | while nodestotag: | |
316 | # grab a node to tag |
|
316 | # grab a node to tag | |
317 | n = nodestotag.pop() |
|
317 | n = nodestotag.pop() | |
318 | # Never tag nullid |
|
318 | # Never tag nullid | |
319 | if n == nullid: |
|
319 | if n == nullid: | |
320 | continue |
|
320 | continue | |
321 | # A node's revision number represents its place in a |
|
321 | # A node's revision number represents its place in a | |
322 | # topologically sorted list of nodes. |
|
322 | # topologically sorted list of nodes. | |
323 | r = self.rev(n) |
|
323 | r = self.rev(n) | |
324 | if r >= lowestrev: |
|
324 | if r >= lowestrev: | |
325 | if n not in ancestors: |
|
325 | if n not in ancestors: | |
326 | # If we are possibly a descendent of one of the roots |
|
326 | # If we are possibly a descendent of one of the roots | |
327 | # and we haven't already been marked as an ancestor |
|
327 | # and we haven't already been marked as an ancestor | |
328 | ancestors[n] = 1 # Mark as ancestor |
|
328 | ancestors[n] = 1 # Mark as ancestor | |
329 | # Add non-nullid parents to list of nodes to tag. |
|
329 | # Add non-nullid parents to list of nodes to tag. | |
330 | nodestotag.extend([p for p in self.parents(n) if |
|
330 | nodestotag.extend([p for p in self.parents(n) if | |
331 | p != nullid]) |
|
331 | p != nullid]) | |
332 | elif n in heads: # We've seen it before, is it a fake head? |
|
332 | elif n in heads: # We've seen it before, is it a fake head? | |
333 | # So it is, real heads should not be the ancestors of |
|
333 | # So it is, real heads should not be the ancestors of | |
334 | # any other heads. |
|
334 | # any other heads. | |
335 | heads.pop(n) |
|
335 | heads.pop(n) | |
336 | if not ancestors: |
|
336 | if not ancestors: | |
337 | return nonodes |
|
337 | return nonodes | |
338 | # Now that we have our set of ancestors, we want to remove any |
|
338 | # Now that we have our set of ancestors, we want to remove any | |
339 | # roots that are not ancestors. |
|
339 | # roots that are not ancestors. | |
340 |
|
340 | |||
341 | # If one of the roots was nullid, everything is included anyway. |
|
341 | # If one of the roots was nullid, everything is included anyway. | |
342 | if lowestrev > -1: |
|
342 | if lowestrev > -1: | |
343 | # But, since we weren't, let's recompute the lowest rev to not |
|
343 | # But, since we weren't, let's recompute the lowest rev to not | |
344 | # include roots that aren't ancestors. |
|
344 | # include roots that aren't ancestors. | |
345 |
|
345 | |||
346 | # Filter out roots that aren't ancestors of heads |
|
346 | # Filter out roots that aren't ancestors of heads | |
347 | roots = [n for n in roots if n in ancestors] |
|
347 | roots = [n for n in roots if n in ancestors] | |
348 | # Recompute the lowest revision |
|
348 | # Recompute the lowest revision | |
349 | if roots: |
|
349 | if roots: | |
350 | lowestrev = min([self.rev(n) for n in roots]) |
|
350 | lowestrev = min([self.rev(n) for n in roots]) | |
351 | else: |
|
351 | else: | |
352 | # No more roots? Return empty list |
|
352 | # No more roots? Return empty list | |
353 | return nonodes |
|
353 | return nonodes | |
354 | else: |
|
354 | else: | |
355 | # We are descending from nullid, and don't need to care about |
|
355 | # We are descending from nullid, and don't need to care about | |
356 | # any other roots. |
|
356 | # any other roots. | |
357 | lowestrev = -1 |
|
357 | lowestrev = -1 | |
358 | roots = [nullid] |
|
358 | roots = [nullid] | |
359 | # Transform our roots list into a 'set' (i.e. a dictionary where the |
|
359 | # Transform our roots list into a 'set' (i.e. a dictionary where the | |
360 | # values don't matter. |
|
360 | # values don't matter. | |
361 | descendents = dict.fromkeys(roots, 1) |
|
361 | descendents = dict.fromkeys(roots, 1) | |
362 | # Also, keep the original roots so we can filter out roots that aren't |
|
362 | # Also, keep the original roots so we can filter out roots that aren't | |
363 | # 'real' roots (i.e. are descended from other roots). |
|
363 | # 'real' roots (i.e. are descended from other roots). | |
364 | roots = descendents.copy() |
|
364 | roots = descendents.copy() | |
365 | # Our topologically sorted list of output nodes. |
|
365 | # Our topologically sorted list of output nodes. | |
366 | orderedout = [] |
|
366 | orderedout = [] | |
367 | # Don't start at nullid since we don't want nullid in our output list, |
|
367 | # Don't start at nullid since we don't want nullid in our output list, | |
368 | # and if nullid shows up in descedents, empty parents will look like |
|
368 | # and if nullid shows up in descedents, empty parents will look like | |
369 | # they're descendents. |
|
369 | # they're descendents. | |
370 | for r in xrange(max(lowestrev, 0), highestrev + 1): |
|
370 | for r in xrange(max(lowestrev, 0), highestrev + 1): | |
371 | n = self.node(r) |
|
371 | n = self.node(r) | |
372 | isdescendent = False |
|
372 | isdescendent = False | |
373 | if lowestrev == -1: # Everybody is a descendent of nullid |
|
373 | if lowestrev == -1: # Everybody is a descendent of nullid | |
374 | isdescendent = True |
|
374 | isdescendent = True | |
375 | elif n in descendents: |
|
375 | elif n in descendents: | |
376 | # n is already a descendent |
|
376 | # n is already a descendent | |
377 | isdescendent = True |
|
377 | isdescendent = True | |
378 | # This check only needs to be done here because all the roots |
|
378 | # This check only needs to be done here because all the roots | |
379 | # will start being marked is descendents before the loop. |
|
379 | # will start being marked is descendents before the loop. | |
380 | if n in roots: |
|
380 | if n in roots: | |
381 | # If n was a root, check if it's a 'real' root. |
|
381 | # If n was a root, check if it's a 'real' root. | |
382 | p = tuple(self.parents(n)) |
|
382 | p = tuple(self.parents(n)) | |
383 | # If any of its parents are descendents, it's not a root. |
|
383 | # If any of its parents are descendents, it's not a root. | |
384 | if (p[0] in descendents) or (p[1] in descendents): |
|
384 | if (p[0] in descendents) or (p[1] in descendents): | |
385 | roots.pop(n) |
|
385 | roots.pop(n) | |
386 | else: |
|
386 | else: | |
387 | p = tuple(self.parents(n)) |
|
387 | p = tuple(self.parents(n)) | |
388 | # A node is a descendent if either of its parents are |
|
388 | # A node is a descendent if either of its parents are | |
389 | # descendents. (We seeded the dependents list with the roots |
|
389 | # descendents. (We seeded the dependents list with the roots | |
390 | # up there, remember?) |
|
390 | # up there, remember?) | |
391 | if (p[0] in descendents) or (p[1] in descendents): |
|
391 | if (p[0] in descendents) or (p[1] in descendents): | |
392 | descendents[n] = 1 |
|
392 | descendents[n] = 1 | |
393 | isdescendent = True |
|
393 | isdescendent = True | |
394 | if isdescendent and ((ancestors is None) or (n in ancestors)): |
|
394 | if isdescendent and ((ancestors is None) or (n in ancestors)): | |
395 | # Only include nodes that are both descendents and ancestors. |
|
395 | # Only include nodes that are both descendents and ancestors. | |
396 | orderedout.append(n) |
|
396 | orderedout.append(n) | |
397 | if (ancestors is not None) and (n in heads): |
|
397 | if (ancestors is not None) and (n in heads): | |
398 | # We're trying to figure out which heads are reachable |
|
398 | # We're trying to figure out which heads are reachable | |
399 | # from roots. |
|
399 | # from roots. | |
400 | # Mark this head as having been reached |
|
400 | # Mark this head as having been reached | |
401 | heads[n] = 1 |
|
401 | heads[n] = 1 | |
402 | elif ancestors is None: |
|
402 | elif ancestors is None: | |
403 | # Otherwise, we're trying to discover the heads. |
|
403 | # Otherwise, we're trying to discover the heads. | |
404 | # Assume this is a head because if it isn't, the next step |
|
404 | # Assume this is a head because if it isn't, the next step | |
405 | # will eventually remove it. |
|
405 | # will eventually remove it. | |
406 | heads[n] = 1 |
|
406 | heads[n] = 1 | |
407 | # But, obviously its parents aren't. |
|
407 | # But, obviously its parents aren't. | |
408 | for p in self.parents(n): |
|
408 | for p in self.parents(n): | |
409 | heads.pop(p, None) |
|
409 | heads.pop(p, None) | |
410 | heads = [n for n in heads.iterkeys() if heads[n] != 0] |
|
410 | heads = [n for n in heads.iterkeys() if heads[n] != 0] | |
411 | roots = roots.keys() |
|
411 | roots = roots.keys() | |
412 | assert orderedout |
|
412 | assert orderedout | |
413 | assert roots |
|
413 | assert roots | |
414 | assert heads |
|
414 | assert heads | |
415 | return (orderedout, roots, heads) |
|
415 | return (orderedout, roots, heads) | |
416 |
|
416 | |||
417 | def heads(self, start=None): |
|
417 | def heads(self, start=None): | |
418 | """return the list of all nodes that have no children |
|
418 | """return the list of all nodes that have no children | |
419 |
|
419 | |||
420 | if start is specified, only heads that are descendants of |
|
420 | if start is specified, only heads that are descendants of | |
421 | start will be returned |
|
421 | start will be returned | |
422 |
|
422 | |||
423 | """ |
|
423 | """ | |
424 | if start is None: |
|
424 | if start is None: | |
425 | start = nullid |
|
425 | start = nullid | |
426 | reachable = {start: 1} |
|
426 | reachable = {start: 1} | |
427 | heads = {start: 1} |
|
427 | heads = {start: 1} | |
428 | startrev = self.rev(start) |
|
428 | startrev = self.rev(start) | |
429 |
|
429 | |||
430 | for r in xrange(startrev + 1, self.count()): |
|
430 | for r in xrange(startrev + 1, self.count()): | |
431 | n = self.node(r) |
|
431 | n = self.node(r) | |
432 | for pn in self.parents(n): |
|
432 | for pn in self.parents(n): | |
433 | if pn in reachable: |
|
433 | if pn in reachable: | |
434 | reachable[n] = 1 |
|
434 | reachable[n] = 1 | |
435 | heads[n] = 1 |
|
435 | heads[n] = 1 | |
436 | if pn in heads: |
|
436 | if pn in heads: | |
437 | del heads[pn] |
|
437 | del heads[pn] | |
438 | return heads.keys() |
|
438 | return heads.keys() | |
439 |
|
439 | |||
440 | def children(self, node): |
|
440 | def children(self, node): | |
441 | """find the children of a given node""" |
|
441 | """find the children of a given node""" | |
442 | c = [] |
|
442 | c = [] | |
443 | p = self.rev(node) |
|
443 | p = self.rev(node) | |
444 | for r in range(p + 1, self.count()): |
|
444 | for r in range(p + 1, self.count()): | |
445 | n = self.node(r) |
|
445 | n = self.node(r) | |
446 | for pn in self.parents(n): |
|
446 | for pn in self.parents(n): | |
447 | if pn == node: |
|
447 | if pn == node: | |
448 | c.append(n) |
|
448 | c.append(n) | |
449 | continue |
|
449 | continue | |
450 | elif pn == nullid: |
|
450 | elif pn == nullid: | |
451 | continue |
|
451 | continue | |
452 | return c |
|
452 | return c | |
453 |
|
453 | |||
454 | def lookup(self, id): |
|
454 | def lookup(self, id): | |
455 | """locate a node based on revision number or subset of hex nodeid""" |
|
455 | """locate a node based on revision number or subset of hex nodeid""" | |
456 | try: |
|
456 | try: | |
457 | rev = int(id) |
|
457 | rev = int(id) | |
458 | if str(rev) != id: raise ValueError |
|
458 | if str(rev) != id: raise ValueError | |
459 | if rev < 0: rev = self.count() + rev |
|
459 | if rev < 0: rev = self.count() + rev | |
460 | if rev < 0 or rev >= self.count(): raise ValueError |
|
460 | if rev < 0 or rev >= self.count(): raise ValueError | |
461 | return self.node(rev) |
|
461 | return self.node(rev) | |
462 | except (ValueError, OverflowError): |
|
462 | except (ValueError, OverflowError): | |
463 | c = [] |
|
463 | c = [] | |
464 | for n in self.nodemap: |
|
464 | for n in self.nodemap: | |
465 | if hex(n).startswith(id): |
|
465 | if hex(n).startswith(id): | |
466 | c.append(n) |
|
466 | c.append(n) | |
467 | if len(c) > 1: raise RevlogError(_("Ambiguous identifier")) |
|
467 | if len(c) > 1: raise RevlogError(_("Ambiguous identifier")) | |
468 | if len(c) < 1: raise RevlogError(_("No match found")) |
|
468 | if len(c) < 1: raise RevlogError(_("No match found")) | |
469 | return c[0] |
|
469 | return c[0] | |
470 |
|
470 | |||
471 | return None |
|
471 | return None | |
472 |
|
472 | |||
473 | def diff(self, a, b): |
|
473 | def diff(self, a, b): | |
474 | """return a delta between two revisions""" |
|
474 | """return a delta between two revisions""" | |
475 | return mdiff.textdiff(a, b) |
|
475 | return mdiff.textdiff(a, b) | |
476 |
|
476 | |||
477 | def patches(self, t, pl): |
|
477 | def patches(self, t, pl): | |
478 | """apply a list of patches to a string""" |
|
478 | """apply a list of patches to a string""" | |
479 | return mdiff.patches(t, pl) |
|
479 | return mdiff.patches(t, pl) | |
480 |
|
480 | |||
481 | def chunk(self, rev): |
|
481 | def chunk(self, rev): | |
482 | start, length = self.start(rev), self.length(rev) |
|
482 | start, length = self.start(rev), self.length(rev) | |
483 | end = start + length |
|
483 | end = start + length | |
484 |
|
484 | |||
485 | def loadcache(): |
|
485 | def loadcache(): | |
486 | cache_length = max(4096 * 1024, length) # 4Mo |
|
486 | cache_length = max(4096 * 1024, length) # 4Mo | |
487 | df = self.opener(self.datafile) |
|
487 | df = self.opener(self.datafile) | |
488 | df.seek(start) |
|
488 | df.seek(start) | |
489 | self.chunkcache = (start, df.read(cache_length)) |
|
489 | self.chunkcache = (start, df.read(cache_length)) | |
490 |
|
490 | |||
491 | if not self.chunkcache: |
|
491 | if not self.chunkcache: | |
492 | loadcache() |
|
492 | loadcache() | |
493 |
|
493 | |||
494 | cache_start = self.chunkcache[0] |
|
494 | cache_start = self.chunkcache[0] | |
495 | cache_end = cache_start + len(self.chunkcache[1]) |
|
495 | cache_end = cache_start + len(self.chunkcache[1]) | |
496 | if start >= cache_start and end <= cache_end: |
|
496 | if start >= cache_start and end <= cache_end: | |
497 | # it is cached |
|
497 | # it is cached | |
498 | offset = start - cache_start |
|
498 | offset = start - cache_start | |
499 | else: |
|
499 | else: | |
500 | loadcache() |
|
500 | loadcache() | |
501 | offset = 0 |
|
501 | offset = 0 | |
502 |
|
502 | |||
503 | #def checkchunk(): |
|
503 | #def checkchunk(): | |
504 | # df = self.opener(self.datafile) |
|
504 | # df = self.opener(self.datafile) | |
505 | # df.seek(start) |
|
505 | # df.seek(start) | |
506 | # return df.read(length) |
|
506 | # return df.read(length) | |
507 | #assert s == checkchunk() |
|
507 | #assert s == checkchunk() | |
508 | return decompress(self.chunkcache[1][offset:offset + length]) |
|
508 | return decompress(self.chunkcache[1][offset:offset + length]) | |
509 |
|
509 | |||
510 | def delta(self, node): |
|
510 | def delta(self, node): | |
511 | """return or calculate a delta between a node and its predecessor""" |
|
511 | """return or calculate a delta between a node and its predecessor""" | |
512 | r = self.rev(node) |
|
512 | r = self.rev(node) | |
513 | b = self.base(r) |
|
513 | b = self.base(r) | |
514 | if r == b: |
|
514 | if r == b: | |
515 | return self.diff(self.revision(self.node(r - 1)), |
|
515 | return self.diff(self.revision(self.node(r - 1)), | |
516 | self.revision(node)) |
|
516 | self.revision(node)) | |
517 | else: |
|
517 | else: | |
518 | return self.chunk(r) |
|
518 | return self.chunk(r) | |
519 |
|
519 | |||
520 | def revision(self, node): |
|
520 | def revision(self, node): | |
521 | """return an uncompressed revision of a given""" |
|
521 | """return an uncompressed revision of a given""" | |
522 | if node == nullid: return "" |
|
522 | if node == nullid: return "" | |
523 | if self.cache and self.cache[0] == node: return self.cache[2] |
|
523 | if self.cache and self.cache[0] == node: return self.cache[2] | |
524 |
|
524 | |||
525 | # look up what we need to read |
|
525 | # look up what we need to read | |
526 | text = None |
|
526 | text = None | |
527 | rev = self.rev(node) |
|
527 | rev = self.rev(node) | |
528 | base = self.base(rev) |
|
528 | base = self.base(rev) | |
529 |
|
529 | |||
530 | # do we have useful data cached? |
|
530 | # do we have useful data cached? | |
531 | if self.cache and self.cache[1] >= base and self.cache[1] < rev: |
|
531 | if self.cache and self.cache[1] >= base and self.cache[1] < rev: | |
532 | base = self.cache[1] |
|
532 | base = self.cache[1] | |
533 | text = self.cache[2] |
|
533 | text = self.cache[2] | |
534 | else: |
|
534 | else: | |
535 | text = self.chunk(base) |
|
535 | text = self.chunk(base) | |
536 |
|
536 | |||
537 | bins = [] |
|
537 | bins = [] | |
538 | for r in xrange(base + 1, rev + 1): |
|
538 | for r in xrange(base + 1, rev + 1): | |
539 | bins.append(self.chunk(r)) |
|
539 | bins.append(self.chunk(r)) | |
540 |
|
540 | |||
541 | text = mdiff.patches(text, bins) |
|
541 | text = mdiff.patches(text, bins) | |
542 |
|
542 | |||
543 | p1, p2 = self.parents(node) |
|
543 | p1, p2 = self.parents(node) | |
544 | if node != hash(text, p1, p2): |
|
544 | if node != hash(text, p1, p2): | |
545 | raise RevlogError(_("integrity check failed on %s:%d") |
|
545 | raise RevlogError(_("integrity check failed on %s:%d") | |
546 | % (self.datafile, rev)) |
|
546 | % (self.datafile, rev)) | |
547 |
|
547 | |||
548 | self.cache = (node, rev, text) |
|
548 | self.cache = (node, rev, text) | |
549 | return text |
|
549 | return text | |
550 |
|
550 | |||
551 | def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
|
551 | def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): | |
552 | """add a revision to the log |
|
552 | """add a revision to the log | |
553 |
|
553 | |||
554 | text - the revision data to add |
|
554 | text - the revision data to add | |
555 | transaction - the transaction object used for rollback |
|
555 | transaction - the transaction object used for rollback | |
556 | link - the linkrev data to add |
|
556 | link - the linkrev data to add | |
557 | p1, p2 - the parent nodeids of the revision |
|
557 | p1, p2 - the parent nodeids of the revision | |
558 | d - an optional precomputed delta |
|
558 | d - an optional precomputed delta | |
559 | """ |
|
559 | """ | |
560 | if text is None: text = "" |
|
560 | if text is None: text = "" | |
561 | if p1 is None: p1 = self.tip() |
|
561 | if p1 is None: p1 = self.tip() | |
562 | if p2 is None: p2 = nullid |
|
562 | if p2 is None: p2 = nullid | |
563 |
|
563 | |||
564 | node = hash(text, p1, p2) |
|
564 | node = hash(text, p1, p2) | |
565 |
|
565 | |||
566 | if node in self.nodemap: |
|
566 | if node in self.nodemap: | |
567 | return node |
|
567 | return node | |
568 |
|
568 | |||
569 | n = self.count() |
|
569 | n = self.count() | |
570 | t = n - 1 |
|
570 | t = n - 1 | |
571 |
|
571 | |||
572 | if n: |
|
572 | if n: | |
573 | base = self.base(t) |
|
573 | base = self.base(t) | |
574 | start = self.start(base) |
|
574 | start = self.start(base) | |
575 | end = self.end(t) |
|
575 | end = self.end(t) | |
576 | if not d: |
|
576 | if not d: | |
577 | prev = self.revision(self.tip()) |
|
577 | prev = self.revision(self.tip()) | |
578 | d = self.diff(prev, str(text)) |
|
578 | d = self.diff(prev, str(text)) | |
579 | data = compress(d) |
|
579 | data = compress(d) | |
580 | l = len(data[1]) + len(data[0]) |
|
580 | l = len(data[1]) + len(data[0]) | |
581 | dist = end - start + l |
|
581 | dist = end - start + l | |
582 |
|
582 | |||
583 | # full versions are inserted when the needed deltas |
|
583 | # full versions are inserted when the needed deltas | |
584 | # become comparable to the uncompressed text |
|
584 | # become comparable to the uncompressed text | |
585 | if not n or dist > len(text) * 2: |
|
585 | if not n or dist > len(text) * 2: | |
586 | data = compress(text) |
|
586 | data = compress(text) | |
587 | l = len(data[1]) + len(data[0]) |
|
587 | l = len(data[1]) + len(data[0]) | |
588 | base = n |
|
588 | base = n | |
589 | else: |
|
589 | else: | |
590 | base = self.base(t) |
|
590 | base = self.base(t) | |
591 |
|
591 | |||
592 | offset = 0 |
|
592 | offset = 0 | |
593 | if t >= 0: |
|
593 | if t >= 0: | |
594 | offset = self.end(t) |
|
594 | offset = self.end(t) | |
595 |
|
595 | |||
596 | e = (offset, l, base, link, p1, p2, node) |
|
596 | e = (offset, l, base, link, p1, p2, node) | |
597 |
|
597 | |||
598 | self.index.append(e) |
|
598 | self.index.append(e) | |
599 | self.nodemap[node] = n |
|
599 | self.nodemap[node] = n | |
600 | entry = struct.pack(indexformat, *e) |
|
600 | entry = struct.pack(indexformat, *e) | |
601 |
|
601 | |||
602 | transaction.add(self.datafile, e[0]) |
|
602 | transaction.add(self.datafile, e[0]) | |
603 | f = self.opener(self.datafile, "a") |
|
603 | f = self.opener(self.datafile, "a") | |
604 | if data[0]: |
|
604 | if data[0]: | |
605 | f.write(data[0]) |
|
605 | f.write(data[0]) | |
606 | f.write(data[1]) |
|
606 | f.write(data[1]) | |
607 | transaction.add(self.indexfile, n * len(entry)) |
|
607 | transaction.add(self.indexfile, n * len(entry)) | |
608 | self.opener(self.indexfile, "a").write(entry) |
|
608 | self.opener(self.indexfile, "a").write(entry) | |
609 |
|
609 | |||
610 | self.cache = (node, n, text) |
|
610 | self.cache = (node, n, text) | |
611 | return node |
|
611 | return node | |
612 |
|
612 | |||
613 | def ancestor(self, a, b): |
|
613 | def ancestor(self, a, b): | |
614 | """calculate the least common ancestor of nodes a and b""" |
|
614 | """calculate the least common ancestor of nodes a and b""" | |
615 | # calculate the distance of every node from root |
|
615 | # calculate the distance of every node from root | |
616 | dist = {nullid: 0} |
|
616 | dist = {nullid: 0} | |
617 | for i in xrange(self.count()): |
|
617 | for i in xrange(self.count()): | |
618 | n = self.node(i) |
|
618 | n = self.node(i) | |
619 | p1, p2 = self.parents(n) |
|
619 | p1, p2 = self.parents(n) | |
620 | dist[n] = max(dist[p1], dist[p2]) + 1 |
|
620 | dist[n] = max(dist[p1], dist[p2]) + 1 | |
621 |
|
621 | |||
622 | # traverse ancestors in order of decreasing distance from root |
|
622 | # traverse ancestors in order of decreasing distance from root | |
623 | def ancestors(node): |
|
623 | def ancestors(node): | |
624 | # we store negative distances because heap returns smallest member |
|
624 | # we store negative distances because heap returns smallest member | |
625 | h = [(-dist[node], node)] |
|
625 | h = [(-dist[node], node)] | |
626 | seen = {} |
|
626 | seen = {} | |
627 | earliest = self.count() |
|
627 | earliest = self.count() | |
628 | while h: |
|
628 | while h: | |
629 | d, n = heapq.heappop(h) |
|
629 | d, n = heapq.heappop(h) | |
630 | if n not in seen: |
|
630 | if n not in seen: | |
631 | seen[n] = 1 |
|
631 | seen[n] = 1 | |
632 | r = self.rev(n) |
|
632 | r = self.rev(n) | |
633 | yield (-d, n) |
|
633 | yield (-d, n) | |
634 | for p in self.parents(n): |
|
634 | for p in self.parents(n): | |
635 | heapq.heappush(h, (-dist[p], p)) |
|
635 | heapq.heappush(h, (-dist[p], p)) | |
636 |
|
636 | |||
637 | def generations(node): |
|
637 | def generations(node): | |
638 | sg, s = None, {} |
|
638 | sg, s = None, {} | |
639 | for g,n in ancestors(node): |
|
639 | for g,n in ancestors(node): | |
640 | if g != sg: |
|
640 | if g != sg: | |
641 | if sg: |
|
641 | if sg: | |
642 | yield sg, s |
|
642 | yield sg, s | |
643 | sg, s = g, {n:1} |
|
643 | sg, s = g, {n:1} | |
644 | else: |
|
644 | else: | |
645 | s[n] = 1 |
|
645 | s[n] = 1 | |
646 | yield sg, s |
|
646 | yield sg, s | |
647 |
|
647 | |||
648 | x = generations(a) |
|
648 | x = generations(a) | |
649 | y = generations(b) |
|
649 | y = generations(b) | |
650 | gx = x.next() |
|
650 | gx = x.next() | |
651 | gy = y.next() |
|
651 | gy = y.next() | |
652 |
|
652 | |||
653 | # increment each ancestor list until it is closer to root than |
|
653 | # increment each ancestor list until it is closer to root than | |
654 | # the other, or they match |
|
654 | # the other, or they match | |
655 | while 1: |
|
655 | while 1: | |
656 | #print "ancestor gen %s %s" % (gx[0], gy[0]) |
|
656 | #print "ancestor gen %s %s" % (gx[0], gy[0]) | |
657 | if gx[0] == gy[0]: |
|
657 | if gx[0] == gy[0]: | |
658 | # find the intersection |
|
658 | # find the intersection | |
659 | i = [ n for n in gx[1] if n in gy[1] ] |
|
659 | i = [ n for n in gx[1] if n in gy[1] ] | |
660 | if i: |
|
660 | if i: | |
661 | return i[0] |
|
661 | return i[0] | |
662 | else: |
|
662 | else: | |
663 | #print "next" |
|
663 | #print "next" | |
664 | gy = y.next() |
|
664 | gy = y.next() | |
665 | gx = x.next() |
|
665 | gx = x.next() | |
666 | elif gx[0] < gy[0]: |
|
666 | elif gx[0] < gy[0]: | |
667 | #print "next y" |
|
667 | #print "next y" | |
668 | gy = y.next() |
|
668 | gy = y.next() | |
669 | else: |
|
669 | else: | |
670 | #print "next x" |
|
670 | #print "next x" | |
671 | gx = x.next() |
|
671 | gx = x.next() | |
672 |
|
672 | |||
673 | def group(self, nodelist, lookup, infocollect=None): |
|
673 | def group(self, nodelist, lookup, infocollect=None): | |
674 | """calculate a delta group |
|
674 | """calculate a delta group | |
675 |
|
675 | |||
676 | Given a list of changeset revs, return a set of deltas and |
|
676 | Given a list of changeset revs, return a set of deltas and | |
677 | metadata corresponding to nodes. the first delta is |
|
677 | metadata corresponding to nodes. the first delta is | |
678 | parent(nodes[0]) -> nodes[0] the receiver is guaranteed to |
|
678 | parent(nodes[0]) -> nodes[0] the receiver is guaranteed to | |
679 | have this parent as it has all history before these |
|
679 | have this parent as it has all history before these | |
680 | changesets. parent is parent[0] |
|
680 | changesets. parent is parent[0] | |
681 | """ |
|
681 | """ | |
682 | revs = [self.rev(n) for n in nodelist] |
|
682 | revs = [self.rev(n) for n in nodelist] | |
683 |
|
683 | |||
684 | # if we don't have any revisions touched by these changesets, bail |
|
684 | # if we don't have any revisions touched by these changesets, bail | |
685 | if not revs: |
|
685 | if not revs: | |
686 | yield struct.pack(">l", 0) |
|
686 | yield struct.pack(">l", 0) | |
687 | return |
|
687 | return | |
688 |
|
688 | |||
689 | # add the parent of the first rev |
|
689 | # add the parent of the first rev | |
690 | p = self.parents(self.node(revs[0]))[0] |
|
690 | p = self.parents(self.node(revs[0]))[0] | |
691 | revs.insert(0, self.rev(p)) |
|
691 | revs.insert(0, self.rev(p)) | |
692 |
|
692 | |||
693 | # helper to reconstruct intermediate versions |
|
693 | # helper to reconstruct intermediate versions | |
694 | def construct(text, base, rev): |
|
694 | def construct(text, base, rev): | |
695 | bins = [self.chunk(r) for r in xrange(base + 1, rev + 1)] |
|
695 | bins = [self.chunk(r) for r in xrange(base + 1, rev + 1)] | |
696 | return mdiff.patches(text, bins) |
|
696 | return mdiff.patches(text, bins) | |
697 |
|
697 | |||
698 | # build deltas |
|
698 | # build deltas | |
699 | for d in xrange(0, len(revs) - 1): |
|
699 | for d in xrange(0, len(revs) - 1): | |
700 | a, b = revs[d], revs[d + 1] |
|
700 | a, b = revs[d], revs[d + 1] | |
701 | na = self.node(a) |
|
701 | na = self.node(a) | |
702 | nb = self.node(b) |
|
702 | nb = self.node(b) | |
703 |
|
703 | |||
704 | if infocollect is not None: |
|
704 | if infocollect is not None: | |
705 | infocollect(nb) |
|
705 | infocollect(nb) | |
706 |
|
706 | |||
707 | # do we need to construct a new delta? |
|
707 | # do we need to construct a new delta? | |
708 | if a + 1 != b or self.base(b) == b: |
|
708 | if a + 1 != b or self.base(b) == b: | |
709 | ta = self.revision(na) |
|
709 | ta = self.revision(na) | |
710 | tb = self.revision(nb) |
|
710 | tb = self.revision(nb) | |
711 | d = self.diff(ta, tb) |
|
711 | d = self.diff(ta, tb) | |
712 | else: |
|
712 | else: | |
713 | d = self.chunk(b) |
|
713 | d = self.chunk(b) | |
714 |
|
714 | |||
715 | p = self.parents(nb) |
|
715 | p = self.parents(nb) | |
716 | meta = nb + p[0] + p[1] + lookup(nb) |
|
716 | meta = nb + p[0] + p[1] + lookup(nb) | |
717 | l = struct.pack(">l", len(meta) + len(d) + 4) |
|
717 | l = struct.pack(">l", len(meta) + len(d) + 4) | |
718 | yield l |
|
718 | yield l | |
719 | yield meta |
|
719 | yield meta | |
720 | yield d |
|
720 | yield d | |
721 |
|
721 | |||
722 | yield struct.pack(">l", 0) |
|
722 | yield struct.pack(">l", 0) | |
723 |
|
723 | |||
724 | def addgroup(self, revs, linkmapper, transaction, unique=0): |
|
724 | def addgroup(self, revs, linkmapper, transaction, unique=0): | |
725 | """ |
|
725 | """ | |
726 | add a delta group |
|
726 | add a delta group | |
727 |
|
727 | |||
728 | given a set of deltas, add them to the revision log. the |
|
728 | given a set of deltas, add them to the revision log. the | |
729 | first delta is against its parent, which should be in our |
|
729 | first delta is against its parent, which should be in our | |
730 | log, the rest are against the previous delta. |
|
730 | log, the rest are against the previous delta. | |
731 | """ |
|
731 | """ | |
732 |
|
732 | |||
733 | #track the base of the current delta log |
|
733 | #track the base of the current delta log | |
734 | r = self.count() |
|
734 | r = self.count() | |
735 | t = r - 1 |
|
735 | t = r - 1 | |
736 | node = nullid |
|
736 | node = nullid | |
737 |
|
737 | |||
738 | base = prev = -1 |
|
738 | base = prev = -1 | |
739 | start = end = measure = 0 |
|
739 | start = end = measure = 0 | |
740 | if r: |
|
740 | if r: | |
741 | start = self.start(self.base(t)) |
|
741 | start = self.start(self.base(t)) | |
742 | end = self.end(t) |
|
742 | end = self.end(t) | |
743 | measure = self.length(self.base(t)) |
|
743 | measure = self.length(self.base(t)) | |
744 | base = self.base(t) |
|
744 | base = self.base(t) | |
745 | prev = self.tip() |
|
745 | prev = self.tip() | |
746 |
|
746 | |||
747 | transaction.add(self.datafile, end) |
|
747 | transaction.add(self.datafile, end) | |
748 | transaction.add(self.indexfile, r * struct.calcsize(indexformat)) |
|
748 | transaction.add(self.indexfile, r * struct.calcsize(indexformat)) | |
749 | dfh = self.opener(self.datafile, "a") |
|
749 | dfh = self.opener(self.datafile, "a") | |
750 | ifh = self.opener(self.indexfile, "a") |
|
750 | ifh = self.opener(self.indexfile, "a") | |
751 |
|
751 | |||
752 | # loop through our set of deltas |
|
752 | # loop through our set of deltas | |
753 | chain = None |
|
753 | chain = None | |
754 | for chunk in revs: |
|
754 | for chunk in revs: | |
755 | node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) |
|
755 | node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) | |
756 | link = linkmapper(cs) |
|
756 | link = linkmapper(cs) | |
757 | if node in self.nodemap: |
|
757 | if node in self.nodemap: | |
758 | # this can happen if two branches make the same change |
|
758 | # this can happen if two branches make the same change | |
759 | # if unique: |
|
759 | # if unique: | |
760 | # raise RevlogError(_("already have %s") % hex(node[:4])) |
|
760 | # raise RevlogError(_("already have %s") % hex(node[:4])) | |
761 | chain = node |
|
761 | chain = node | |
762 | continue |
|
762 | continue | |
763 | delta = chunk[80:] |
|
763 | delta = chunk[80:] | |
764 |
|
764 | |||
765 | for p in (p1, p2): |
|
765 | for p in (p1, p2): | |
766 | if not p in self.nodemap: |
|
766 | if not p in self.nodemap: | |
767 | raise RevlogError(_("unknown parent %s") % short(p1)) |
|
767 | raise RevlogError(_("unknown parent %s") % short(p1)) | |
768 |
|
768 | |||
769 | if not chain: |
|
769 | if not chain: | |
770 | # retrieve the parent revision of the delta chain |
|
770 | # retrieve the parent revision of the delta chain | |
771 | chain = p1 |
|
771 | chain = p1 | |
772 | if not chain in self.nodemap: |
|
772 | if not chain in self.nodemap: | |
773 | raise RevlogError(_("unknown base %s") % short(chain[:4])) |
|
773 | raise RevlogError(_("unknown base %s") % short(chain[:4])) | |
774 |
|
774 | |||
775 | # full versions are inserted when the needed deltas become |
|
775 | # full versions are inserted when the needed deltas become | |
776 | # comparable to the uncompressed text or when the previous |
|
776 | # comparable to the uncompressed text or when the previous | |
777 | # version is not the one we have a delta against. We use |
|
777 | # version is not the one we have a delta against. We use | |
778 | # the size of the previous full rev as a proxy for the |
|
778 | # the size of the previous full rev as a proxy for the | |
779 | # current size. |
|
779 | # current size. | |
780 |
|
780 | |||
781 | if chain == prev: |
|
781 | if chain == prev: | |
782 | tempd = compress(delta) |
|
782 | tempd = compress(delta) | |
783 | cdelta = tempd[0] + tempd[1] |
|
783 | cdelta = tempd[0] + tempd[1] | |
784 |
|
784 | |||
785 | if chain != prev or (end - start + len(cdelta)) > measure * 2: |
|
785 | if chain != prev or (end - start + len(cdelta)) > measure * 2: | |
786 | # flush our writes here so we can read it in revision |
|
786 | # flush our writes here so we can read it in revision | |
787 | dfh.flush() |
|
787 | dfh.flush() | |
788 | ifh.flush() |
|
788 | ifh.flush() | |
789 | text = self.revision(chain) |
|
789 | text = self.revision(chain) | |
790 | text = self.patches(text, [delta]) |
|
790 | text = self.patches(text, [delta]) | |
791 | chk = self.addrevision(text, transaction, link, p1, p2) |
|
791 | chk = self.addrevision(text, transaction, link, p1, p2) | |
792 | if chk != node: |
|
792 | if chk != node: | |
793 | raise RevlogError(_("consistency error adding group")) |
|
793 | raise RevlogError(_("consistency error adding group")) | |
794 | measure = len(text) |
|
794 | measure = len(text) | |
795 | else: |
|
795 | else: | |
796 | e = (end, len(cdelta), self.base(t), link, p1, p2, node) |
|
796 | e = (end, len(cdelta), self.base(t), link, p1, p2, node) | |
797 | self.index.append(e) |
|
797 | self.index.append(e) | |
798 | self.nodemap[node] = r |
|
798 | self.nodemap[node] = r | |
799 | dfh.write(cdelta) |
|
799 | dfh.write(cdelta) | |
800 | ifh.write(struct.pack(indexformat, *e)) |
|
800 | ifh.write(struct.pack(indexformat, *e)) | |
801 |
|
801 | |||
802 | t, r, chain, prev = r, r + 1, node, node |
|
802 | t, r, chain, prev = r, r + 1, node, node | |
803 | start = self.start(self.base(t)) |
|
803 | start = self.start(self.base(t)) | |
804 | end = self.end(t) |
|
804 | end = self.end(t) | |
805 |
|
805 | |||
806 | dfh.close() |
|
806 | dfh.close() | |
807 | ifh.close() |
|
807 | ifh.close() | |
808 | return node |
|
808 | return node | |
809 |
|
809 | |||
810 | def strip(self, rev, minlink): |
|
810 | def strip(self, rev, minlink): | |
811 | if self.count() == 0 or rev >= self.count(): |
|
811 | if self.count() == 0 or rev >= self.count(): | |
812 | return |
|
812 | return | |
813 |
|
813 | |||
814 | # When stripping away a revision, we need to make sure it |
|
814 | # When stripping away a revision, we need to make sure it | |
815 | # does not actually belong to an older changeset. |
|
815 | # does not actually belong to an older changeset. | |
816 | # The minlink parameter defines the oldest revision |
|
816 | # The minlink parameter defines the oldest revision | |
817 | # we're allowed to strip away. |
|
817 | # we're allowed to strip away. | |
818 | while minlink > self.index[rev][3]: |
|
818 | while minlink > self.index[rev][3]: | |
819 | rev += 1 |
|
819 | rev += 1 | |
820 | if rev >= self.count(): |
|
820 | if rev >= self.count(): | |
821 | return |
|
821 | return | |
822 |
|
822 | |||
823 | # first truncate the files on disk |
|
823 | # first truncate the files on disk | |
824 | end = self.start(rev) |
|
824 | end = self.start(rev) | |
825 | self.opener(self.datafile, "a").truncate(end) |
|
825 | self.opener(self.datafile, "a").truncate(end) | |
826 | end = rev * struct.calcsize(indexformat) |
|
826 | end = rev * struct.calcsize(indexformat) | |
827 | self.opener(self.indexfile, "a").truncate(end) |
|
827 | self.opener(self.indexfile, "a").truncate(end) | |
828 |
|
828 | |||
829 | # then reset internal state in memory to forget those revisions |
|
829 | # then reset internal state in memory to forget those revisions | |
830 | self.cache = None |
|
830 | self.cache = None | |
|
831 | self.chunkcache = None | |||
831 | for p in self.index[rev:]: |
|
832 | for p in self.index[rev:]: | |
832 | del self.nodemap[p[6]] |
|
833 | del self.nodemap[p[6]] | |
833 | del self.index[rev:] |
|
834 | del self.index[rev:] | |
834 |
|
835 | |||
835 | # truncating the lazyindex also truncates the lazymap. |
|
836 | # truncating the lazyindex also truncates the lazymap. | |
836 | if isinstance(self.index, lazyindex): |
|
837 | if isinstance(self.index, lazyindex): | |
837 | self.index.trunc(end) |
|
838 | self.index.trunc(end) | |
838 |
|
839 | |||
839 |
|
840 | |||
840 | def checksize(self): |
|
841 | def checksize(self): | |
841 | expected = 0 |
|
842 | expected = 0 | |
842 | if self.count(): |
|
843 | if self.count(): | |
843 | expected = self.end(self.count() - 1) |
|
844 | expected = self.end(self.count() - 1) | |
844 |
|
845 | |||
845 | try: |
|
846 | try: | |
846 | f = self.opener(self.datafile) |
|
847 | f = self.opener(self.datafile) | |
847 | f.seek(0, 2) |
|
848 | f.seek(0, 2) | |
848 | actual = f.tell() |
|
849 | actual = f.tell() | |
849 | dd = actual - expected |
|
850 | dd = actual - expected | |
850 | except IOError, inst: |
|
851 | except IOError, inst: | |
851 | if inst.errno != errno.ENOENT: |
|
852 | if inst.errno != errno.ENOENT: | |
852 | raise |
|
853 | raise | |
853 | dd = 0 |
|
854 | dd = 0 | |
854 |
|
855 | |||
855 | try: |
|
856 | try: | |
856 | f = self.opener(self.indexfile) |
|
857 | f = self.opener(self.indexfile) | |
857 | f.seek(0, 2) |
|
858 | f.seek(0, 2) | |
858 | actual = f.tell() |
|
859 | actual = f.tell() | |
859 | s = struct.calcsize(indexformat) |
|
860 | s = struct.calcsize(indexformat) | |
860 | i = actual / s |
|
861 | i = actual / s | |
861 | di = actual - (i * s) |
|
862 | di = actual - (i * s) | |
862 | except IOError, inst: |
|
863 | except IOError, inst: | |
863 | if inst.errno != errno.ENOENT: |
|
864 | if inst.errno != errno.ENOENT: | |
864 | raise |
|
865 | raise | |
865 | di = 0 |
|
866 | di = 0 | |
866 |
|
867 | |||
867 | return (dd, di) |
|
868 | return (dd, di) | |
868 |
|
869 | |||
869 |
|
870 |
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