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Commit | Line | Data |
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a2ad79ce CC |
1 | #include "cache.h" |
2 | #include "commit.h" | |
3 | #include "diff.h" | |
4 | #include "revision.h" | |
1bf072e3 CC |
5 | #include "refs.h" |
6 | #include "list-objects.h" | |
3b437b0d | 7 | #include "quote.h" |
4eb5b646 | 8 | #include "sha1-lookup.h" |
ef24c7ca | 9 | #include "run-command.h" |
e22278c0 | 10 | #include "log-tree.h" |
a2ad79ce | 11 | #include "bisect.h" |
902bb364 | 12 | #include "sha1-array.h" |
8a534b61 | 13 | #include "argv-array.h" |
6212b1aa | 14 | |
fad2d31d | 15 | static struct sha1_array good_revs; |
6212b1aa | 16 | static struct sha1_array skipped_revs; |
1bf072e3 | 17 | |
3c5ff995 | 18 | static struct object_id *current_bad_oid; |
ef24c7ca | 19 | |
ef24c7ca CC |
20 | static const char *argv_checkout[] = {"checkout", "-q", NULL, "--", NULL}; |
21 | static const char *argv_show_branch[] = {"show-branch", NULL, NULL}; | |
22 | ||
43f9d9f3 AD |
23 | static const char *term_bad; |
24 | static const char *term_good; | |
25 | ||
208acbfb | 26 | /* Remember to update object flag allocation in object.h */ |
a2ad79ce CC |
27 | #define COUNTED (1u<<16) |
28 | ||
29 | /* | |
30 | * This is a truly stupid algorithm, but it's only | |
31 | * used for bisection, and we just don't care enough. | |
32 | * | |
33 | * We care just barely enough to avoid recursing for | |
34 | * non-merge entries. | |
35 | */ | |
36 | static int count_distance(struct commit_list *entry) | |
37 | { | |
38 | int nr = 0; | |
39 | ||
40 | while (entry) { | |
41 | struct commit *commit = entry->item; | |
42 | struct commit_list *p; | |
43 | ||
44 | if (commit->object.flags & (UNINTERESTING | COUNTED)) | |
45 | break; | |
46 | if (!(commit->object.flags & TREESAME)) | |
47 | nr++; | |
48 | commit->object.flags |= COUNTED; | |
49 | p = commit->parents; | |
50 | entry = p; | |
51 | if (p) { | |
52 | p = p->next; | |
53 | while (p) { | |
54 | nr += count_distance(p); | |
55 | p = p->next; | |
56 | } | |
57 | } | |
58 | } | |
59 | ||
60 | return nr; | |
61 | } | |
62 | ||
63 | static void clear_distance(struct commit_list *list) | |
64 | { | |
65 | while (list) { | |
66 | struct commit *commit = list->item; | |
67 | commit->object.flags &= ~COUNTED; | |
68 | list = list->next; | |
69 | } | |
70 | } | |
71 | ||
72 | #define DEBUG_BISECT 0 | |
73 | ||
74 | static inline int weight(struct commit_list *elem) | |
75 | { | |
76 | return *((int*)(elem->item->util)); | |
77 | } | |
78 | ||
79 | static inline void weight_set(struct commit_list *elem, int weight) | |
80 | { | |
81 | *((int*)(elem->item->util)) = weight; | |
82 | } | |
83 | ||
84 | static int count_interesting_parents(struct commit *commit) | |
85 | { | |
86 | struct commit_list *p; | |
87 | int count; | |
88 | ||
89 | for (count = 0, p = commit->parents; p; p = p->next) { | |
90 | if (p->item->object.flags & UNINTERESTING) | |
91 | continue; | |
92 | count++; | |
93 | } | |
94 | return count; | |
95 | } | |
96 | ||
97 | static inline int halfway(struct commit_list *p, int nr) | |
98 | { | |
99 | /* | |
100 | * Don't short-cut something we are not going to return! | |
101 | */ | |
102 | if (p->item->object.flags & TREESAME) | |
103 | return 0; | |
104 | if (DEBUG_BISECT) | |
105 | return 0; | |
106 | /* | |
107 | * 2 and 3 are halfway of 5. | |
108 | * 3 is halfway of 6 but 2 and 4 are not. | |
109 | */ | |
110 | switch (2 * weight(p) - nr) { | |
111 | case -1: case 0: case 1: | |
112 | return 1; | |
113 | default: | |
114 | return 0; | |
115 | } | |
116 | } | |
117 | ||
118 | #if !DEBUG_BISECT | |
119 | #define show_list(a,b,c,d) do { ; } while (0) | |
120 | #else | |
121 | static void show_list(const char *debug, int counted, int nr, | |
122 | struct commit_list *list) | |
123 | { | |
124 | struct commit_list *p; | |
125 | ||
126 | fprintf(stderr, "%s (%d/%d)\n", debug, counted, nr); | |
127 | ||
128 | for (p = list; p; p = p->next) { | |
129 | struct commit_list *pp; | |
130 | struct commit *commit = p->item; | |
131 | unsigned flags = commit->object.flags; | |
132 | enum object_type type; | |
133 | unsigned long size; | |
134 | char *buf = read_sha1_file(commit->object.sha1, &type, &size); | |
56ff3794 CC |
135 | const char *subject_start; |
136 | int subject_len; | |
a2ad79ce CC |
137 | |
138 | fprintf(stderr, "%c%c%c ", | |
139 | (flags & TREESAME) ? ' ' : 'T', | |
140 | (flags & UNINTERESTING) ? 'U' : ' ', | |
141 | (flags & COUNTED) ? 'C' : ' '); | |
142 | if (commit->util) | |
143 | fprintf(stderr, "%3d", weight(p)); | |
144 | else | |
145 | fprintf(stderr, "---"); | |
146 | fprintf(stderr, " %.*s", 8, sha1_to_hex(commit->object.sha1)); | |
147 | for (pp = commit->parents; pp; pp = pp->next) | |
148 | fprintf(stderr, " %.*s", 8, | |
149 | sha1_to_hex(pp->item->object.sha1)); | |
150 | ||
56ff3794 CC |
151 | subject_len = find_commit_subject(buf, &subject_start); |
152 | if (subject_len) | |
153 | fprintf(stderr, " %.*s", subject_len, subject_start); | |
a2ad79ce CC |
154 | fprintf(stderr, "\n"); |
155 | } | |
156 | } | |
157 | #endif /* DEBUG_BISECT */ | |
158 | ||
159 | static struct commit_list *best_bisection(struct commit_list *list, int nr) | |
160 | { | |
161 | struct commit_list *p, *best; | |
162 | int best_distance = -1; | |
163 | ||
164 | best = list; | |
165 | for (p = list; p; p = p->next) { | |
166 | int distance; | |
167 | unsigned flags = p->item->object.flags; | |
168 | ||
169 | if (flags & TREESAME) | |
170 | continue; | |
171 | distance = weight(p); | |
172 | if (nr - distance < distance) | |
173 | distance = nr - distance; | |
174 | if (distance > best_distance) { | |
175 | best = p; | |
176 | best_distance = distance; | |
177 | } | |
178 | } | |
179 | ||
180 | return best; | |
181 | } | |
182 | ||
183 | struct commit_dist { | |
184 | struct commit *commit; | |
185 | int distance; | |
186 | }; | |
187 | ||
188 | static int compare_commit_dist(const void *a_, const void *b_) | |
189 | { | |
190 | struct commit_dist *a, *b; | |
191 | ||
192 | a = (struct commit_dist *)a_; | |
193 | b = (struct commit_dist *)b_; | |
194 | if (a->distance != b->distance) | |
195 | return b->distance - a->distance; /* desc sort */ | |
f2fd0760 | 196 | return oidcmp(&a->commit->object.oid, &b->commit->object.oid); |
a2ad79ce CC |
197 | } |
198 | ||
199 | static struct commit_list *best_bisection_sorted(struct commit_list *list, int nr) | |
200 | { | |
201 | struct commit_list *p; | |
202 | struct commit_dist *array = xcalloc(nr, sizeof(*array)); | |
5b1ef2ce | 203 | struct strbuf buf = STRBUF_INIT; |
a2ad79ce CC |
204 | int cnt, i; |
205 | ||
206 | for (p = list, cnt = 0; p; p = p->next) { | |
207 | int distance; | |
208 | unsigned flags = p->item->object.flags; | |
209 | ||
210 | if (flags & TREESAME) | |
211 | continue; | |
212 | distance = weight(p); | |
213 | if (nr - distance < distance) | |
214 | distance = nr - distance; | |
215 | array[cnt].commit = p->item; | |
216 | array[cnt].distance = distance; | |
217 | cnt++; | |
218 | } | |
9ed0d8d6 | 219 | QSORT(array, cnt, compare_commit_dist); |
a2ad79ce | 220 | for (p = list, i = 0; i < cnt; i++) { |
a2ad79ce CC |
221 | struct object *obj = &(array[i].commit->object); |
222 | ||
5b1ef2ce JK |
223 | strbuf_reset(&buf); |
224 | strbuf_addf(&buf, "dist=%d", array[i].distance); | |
225 | add_name_decoration(DECORATION_NONE, buf.buf, obj); | |
662174d2 | 226 | |
a2ad79ce CC |
227 | p->item = array[i].commit; |
228 | p = p->next; | |
229 | } | |
230 | if (p) | |
231 | p->next = NULL; | |
5b1ef2ce | 232 | strbuf_release(&buf); |
a2ad79ce CC |
233 | free(array); |
234 | return list; | |
235 | } | |
236 | ||
237 | /* | |
238 | * zero or positive weight is the number of interesting commits it can | |
239 | * reach, including itself. Especially, weight = 0 means it does not | |
240 | * reach any tree-changing commits (e.g. just above uninteresting one | |
241 | * but traversal is with pathspec). | |
242 | * | |
243 | * weight = -1 means it has one parent and its distance is yet to | |
244 | * be computed. | |
245 | * | |
246 | * weight = -2 means it has more than one parent and its distance is | |
247 | * unknown. After running count_distance() first, they will get zero | |
248 | * or positive distance. | |
249 | */ | |
250 | static struct commit_list *do_find_bisection(struct commit_list *list, | |
251 | int nr, int *weights, | |
252 | int find_all) | |
253 | { | |
254 | int n, counted; | |
255 | struct commit_list *p; | |
256 | ||
257 | counted = 0; | |
258 | ||
259 | for (n = 0, p = list; p; p = p->next) { | |
260 | struct commit *commit = p->item; | |
261 | unsigned flags = commit->object.flags; | |
262 | ||
263 | p->item->util = &weights[n++]; | |
264 | switch (count_interesting_parents(commit)) { | |
265 | case 0: | |
266 | if (!(flags & TREESAME)) { | |
267 | weight_set(p, 1); | |
268 | counted++; | |
269 | show_list("bisection 2 count one", | |
270 | counted, nr, list); | |
271 | } | |
272 | /* | |
273 | * otherwise, it is known not to reach any | |
274 | * tree-changing commit and gets weight 0. | |
275 | */ | |
276 | break; | |
277 | case 1: | |
278 | weight_set(p, -1); | |
279 | break; | |
280 | default: | |
281 | weight_set(p, -2); | |
282 | break; | |
283 | } | |
284 | } | |
285 | ||
286 | show_list("bisection 2 initialize", counted, nr, list); | |
287 | ||
288 | /* | |
289 | * If you have only one parent in the resulting set | |
290 | * then you can reach one commit more than that parent | |
291 | * can reach. So we do not have to run the expensive | |
292 | * count_distance() for single strand of pearls. | |
293 | * | |
294 | * However, if you have more than one parents, you cannot | |
295 | * just add their distance and one for yourself, since | |
296 | * they usually reach the same ancestor and you would | |
297 | * end up counting them twice that way. | |
298 | * | |
299 | * So we will first count distance of merges the usual | |
300 | * way, and then fill the blanks using cheaper algorithm. | |
301 | */ | |
302 | for (p = list; p; p = p->next) { | |
303 | if (p->item->object.flags & UNINTERESTING) | |
304 | continue; | |
305 | if (weight(p) != -2) | |
306 | continue; | |
307 | weight_set(p, count_distance(p)); | |
308 | clear_distance(list); | |
309 | ||
310 | /* Does it happen to be at exactly half-way? */ | |
311 | if (!find_all && halfway(p, nr)) | |
312 | return p; | |
313 | counted++; | |
314 | } | |
315 | ||
316 | show_list("bisection 2 count_distance", counted, nr, list); | |
317 | ||
318 | while (counted < nr) { | |
319 | for (p = list; p; p = p->next) { | |
320 | struct commit_list *q; | |
321 | unsigned flags = p->item->object.flags; | |
322 | ||
323 | if (0 <= weight(p)) | |
324 | continue; | |
325 | for (q = p->item->parents; q; q = q->next) { | |
326 | if (q->item->object.flags & UNINTERESTING) | |
327 | continue; | |
328 | if (0 <= weight(q)) | |
329 | break; | |
330 | } | |
331 | if (!q) | |
332 | continue; | |
333 | ||
334 | /* | |
335 | * weight for p is unknown but q is known. | |
336 | * add one for p itself if p is to be counted, | |
337 | * otherwise inherit it from q directly. | |
338 | */ | |
339 | if (!(flags & TREESAME)) { | |
340 | weight_set(p, weight(q)+1); | |
341 | counted++; | |
342 | show_list("bisection 2 count one", | |
343 | counted, nr, list); | |
344 | } | |
345 | else | |
346 | weight_set(p, weight(q)); | |
347 | ||
348 | /* Does it happen to be at exactly half-way? */ | |
349 | if (!find_all && halfway(p, nr)) | |
350 | return p; | |
351 | } | |
352 | } | |
353 | ||
354 | show_list("bisection 2 counted all", counted, nr, list); | |
355 | ||
356 | if (!find_all) | |
357 | return best_bisection(list, nr); | |
358 | else | |
359 | return best_bisection_sorted(list, nr); | |
360 | } | |
361 | ||
362 | struct commit_list *find_bisection(struct commit_list *list, | |
363 | int *reaches, int *all, | |
364 | int find_all) | |
365 | { | |
366 | int nr, on_list; | |
367 | struct commit_list *p, *best, *next, *last; | |
368 | int *weights; | |
369 | ||
370 | show_list("bisection 2 entry", 0, 0, list); | |
371 | ||
372 | /* | |
373 | * Count the number of total and tree-changing items on the | |
374 | * list, while reversing the list. | |
375 | */ | |
376 | for (nr = on_list = 0, last = NULL, p = list; | |
377 | p; | |
378 | p = next) { | |
379 | unsigned flags = p->item->object.flags; | |
380 | ||
381 | next = p->next; | |
382 | if (flags & UNINTERESTING) | |
383 | continue; | |
384 | p->next = last; | |
385 | last = p; | |
386 | if (!(flags & TREESAME)) | |
387 | nr++; | |
388 | on_list++; | |
389 | } | |
390 | list = last; | |
391 | show_list("bisection 2 sorted", 0, nr, list); | |
392 | ||
393 | *all = nr; | |
394 | weights = xcalloc(on_list, sizeof(*weights)); | |
395 | ||
396 | /* Do the real work of finding bisection commit. */ | |
397 | best = do_find_bisection(list, nr, weights, find_all); | |
398 | if (best) { | |
399 | if (!find_all) | |
400 | best->next = NULL; | |
401 | *reaches = weight(best); | |
402 | } | |
403 | free(weights); | |
404 | return best; | |
405 | } | |
406 | ||
eed25148 | 407 | static int register_ref(const char *refname, const struct object_id *oid, |
1bf072e3 CC |
408 | int flags, void *cb_data) |
409 | { | |
43f9d9f3 AD |
410 | struct strbuf good_prefix = STRBUF_INIT; |
411 | strbuf_addstr(&good_prefix, term_good); | |
412 | strbuf_addstr(&good_prefix, "-"); | |
413 | ||
414 | if (!strcmp(refname, term_bad)) { | |
3c5ff995 | 415 | current_bad_oid = xmalloc(sizeof(*current_bad_oid)); |
eed25148 | 416 | oidcpy(current_bad_oid, oid); |
43f9d9f3 | 417 | } else if (starts_with(refname, good_prefix.buf)) { |
eed25148 | 418 | sha1_array_append(&good_revs, oid->hash); |
59556548 | 419 | } else if (starts_with(refname, "skip-")) { |
eed25148 | 420 | sha1_array_append(&skipped_revs, oid->hash); |
1bf072e3 CC |
421 | } |
422 | ||
43f9d9f3 AD |
423 | strbuf_release(&good_prefix); |
424 | ||
1bf072e3 CC |
425 | return 0; |
426 | } | |
427 | ||
428 | static int read_bisect_refs(void) | |
429 | { | |
eed25148 | 430 | return for_each_ref_in("refs/bisect/", register_ref, NULL); |
1bf072e3 CC |
431 | } |
432 | ||
f932729c JK |
433 | static GIT_PATH_FUNC(git_path_bisect_names, "BISECT_NAMES") |
434 | static GIT_PATH_FUNC(git_path_bisect_expected_rev, "BISECT_EXPECTED_REV") | |
435 | ||
2af202be | 436 | static void read_bisect_paths(struct argv_array *array) |
3b437b0d CC |
437 | { |
438 | struct strbuf str = STRBUF_INIT; | |
f932729c | 439 | const char *filename = git_path_bisect_names(); |
3b437b0d CC |
440 | FILE *fp = fopen(filename, "r"); |
441 | ||
442 | if (!fp) | |
14dc4899 | 443 | die_errno(_("Could not open file '%s'"), filename); |
3b437b0d | 444 | |
8f309aeb | 445 | while (strbuf_getline_lf(&str, fp) != EOF) { |
3b437b0d | 446 | strbuf_trim(&str); |
8a534b61 | 447 | if (sq_dequote_to_argv_array(str.buf, array)) |
14dc4899 | 448 | die(_("Badly quoted content in file '%s': %s"), |
8a534b61 | 449 | filename, str.buf); |
3b437b0d CC |
450 | } |
451 | ||
452 | strbuf_release(&str); | |
453 | fclose(fp); | |
454 | } | |
455 | ||
c0537662 CC |
456 | static char *join_sha1_array_hex(struct sha1_array *array, char delim) |
457 | { | |
458 | struct strbuf joined_hexs = STRBUF_INIT; | |
459 | int i; | |
460 | ||
902bb364 | 461 | for (i = 0; i < array->nr; i++) { |
c0537662 | 462 | strbuf_addstr(&joined_hexs, sha1_to_hex(array->sha1[i])); |
902bb364 | 463 | if (i + 1 < array->nr) |
c0537662 CC |
464 | strbuf_addch(&joined_hexs, delim); |
465 | } | |
466 | ||
467 | return strbuf_detach(&joined_hexs, NULL); | |
468 | } | |
469 | ||
9af3589e CC |
470 | /* |
471 | * In this function, passing a not NULL skipped_first is very special. | |
472 | * It means that we want to know if the first commit in the list is | |
473 | * skipped because we will want to test a commit away from it if it is | |
474 | * indeed skipped. | |
475 | * So if the first commit is skipped, we cannot take the shortcut to | |
476 | * just "return list" when we find the first non skipped commit, we | |
477 | * have to return a fully filtered list. | |
478 | * | |
479 | * We use (*skipped_first == -1) to mean "it has been found that the | |
480 | * first commit is not skipped". In this case *skipped_first is set back | |
481 | * to 0 just before the function returns. | |
482 | */ | |
95188648 CC |
483 | struct commit_list *filter_skipped(struct commit_list *list, |
484 | struct commit_list **tried, | |
9af3589e CC |
485 | int show_all, |
486 | int *count, | |
487 | int *skipped_first) | |
95188648 CC |
488 | { |
489 | struct commit_list *filtered = NULL, **f = &filtered; | |
490 | ||
491 | *tried = NULL; | |
492 | ||
9af3589e CC |
493 | if (skipped_first) |
494 | *skipped_first = 0; | |
495 | if (count) | |
496 | *count = 0; | |
497 | ||
902bb364 | 498 | if (!skipped_revs.nr) |
95188648 CC |
499 | return list; |
500 | ||
95188648 CC |
501 | while (list) { |
502 | struct commit_list *next = list->next; | |
503 | list->next = NULL; | |
902bb364 | 504 | if (0 <= sha1_array_lookup(&skipped_revs, |
ed1c9977 | 505 | list->item->object.oid.hash)) { |
9af3589e CC |
506 | if (skipped_first && !*skipped_first) |
507 | *skipped_first = 1; | |
95188648 CC |
508 | /* Move current to tried list */ |
509 | *tried = list; | |
510 | tried = &list->next; | |
511 | } else { | |
9af3589e CC |
512 | if (!show_all) { |
513 | if (!skipped_first || !*skipped_first) | |
514 | return list; | |
515 | } else if (skipped_first && !*skipped_first) { | |
516 | /* This means we know it's not skipped */ | |
517 | *skipped_first = -1; | |
518 | } | |
95188648 CC |
519 | /* Move current to filtered list */ |
520 | *f = list; | |
521 | f = &list->next; | |
9af3589e CC |
522 | if (count) |
523 | (*count)++; | |
95188648 CC |
524 | } |
525 | list = next; | |
526 | } | |
527 | ||
9af3589e CC |
528 | if (skipped_first && *skipped_first == -1) |
529 | *skipped_first = 0; | |
530 | ||
95188648 CC |
531 | return filtered; |
532 | } | |
1bf072e3 | 533 | |
ebc9529f CC |
534 | #define PRN_MODULO 32768 |
535 | ||
536 | /* | |
537 | * This is a pseudo random number generator based on "man 3 rand". | |
538 | * It is not used properly because the seed is the argument and it | |
539 | * is increased by one between each call, but that should not matter | |
540 | * for this application. | |
541 | */ | |
7b96d888 | 542 | static unsigned get_prn(unsigned count) { |
ebc9529f | 543 | count = count * 1103515245 + 12345; |
7b96d888 | 544 | return (count/65536) % PRN_MODULO; |
ebc9529f CC |
545 | } |
546 | ||
547 | /* | |
548 | * Custom integer square root from | |
549 | * http://en.wikipedia.org/wiki/Integer_square_root | |
550 | */ | |
551 | static int sqrti(int val) | |
552 | { | |
553 | float d, x = val; | |
554 | ||
555 | if (val == 0) | |
556 | return 0; | |
557 | ||
558 | do { | |
559 | float y = (x + (float)val / x) / 2; | |
560 | d = (y > x) ? y - x : x - y; | |
561 | x = y; | |
562 | } while (d >= 0.5); | |
563 | ||
564 | return (int)x; | |
565 | } | |
566 | ||
567 | static struct commit_list *skip_away(struct commit_list *list, int count) | |
62d0b0da | 568 | { |
62d0b0da | 569 | struct commit_list *cur, *previous; |
ebc9529f CC |
570 | int prn, index, i; |
571 | ||
572 | prn = get_prn(count); | |
573 | index = (count * prn / PRN_MODULO) * sqrti(prn) / sqrti(PRN_MODULO); | |
62d0b0da CC |
574 | |
575 | cur = list; | |
576 | previous = NULL; | |
62d0b0da CC |
577 | |
578 | for (i = 0; cur; cur = cur->next, i++) { | |
579 | if (i == index) { | |
f2fd0760 | 580 | if (oidcmp(&cur->item->object.oid, current_bad_oid)) |
62d0b0da CC |
581 | return cur; |
582 | if (previous) | |
583 | return previous; | |
584 | return list; | |
585 | } | |
586 | previous = cur; | |
587 | } | |
588 | ||
589 | return list; | |
590 | } | |
591 | ||
592 | static struct commit_list *managed_skipped(struct commit_list *list, | |
593 | struct commit_list **tried) | |
594 | { | |
595 | int count, skipped_first; | |
62d0b0da CC |
596 | |
597 | *tried = NULL; | |
598 | ||
902bb364 | 599 | if (!skipped_revs.nr) |
62d0b0da CC |
600 | return list; |
601 | ||
602 | list = filter_skipped(list, tried, 0, &count, &skipped_first); | |
603 | ||
604 | if (!skipped_first) | |
605 | return list; | |
606 | ||
ebc9529f | 607 | return skip_away(list, count); |
62d0b0da CC |
608 | } |
609 | ||
a22347c6 CC |
610 | static void bisect_rev_setup(struct rev_info *revs, const char *prefix, |
611 | const char *bad_format, const char *good_format, | |
612 | int read_paths) | |
1bf072e3 | 613 | { |
8a534b61 | 614 | struct argv_array rev_argv = ARGV_ARRAY_INIT; |
fad2d31d CC |
615 | int i; |
616 | ||
3b437b0d CC |
617 | init_revisions(revs, prefix); |
618 | revs->abbrev = 0; | |
619 | revs->commit_format = CMIT_FMT_UNSPECIFIED; | |
1bf072e3 | 620 | |
1c953a1f | 621 | /* rev_argv.argv[0] will be ignored by setup_revisions */ |
8a534b61 | 622 | argv_array_push(&rev_argv, "bisect_rev_setup"); |
3c5ff995 | 623 | argv_array_pushf(&rev_argv, bad_format, oid_to_hex(current_bad_oid)); |
902bb364 | 624 | for (i = 0; i < good_revs.nr; i++) |
8a534b61 JK |
625 | argv_array_pushf(&rev_argv, good_format, |
626 | sha1_to_hex(good_revs.sha1[i])); | |
627 | argv_array_push(&rev_argv, "--"); | |
a22347c6 CC |
628 | if (read_paths) |
629 | read_bisect_paths(&rev_argv); | |
3b437b0d | 630 | |
8a534b61 JK |
631 | setup_revisions(rev_argv.argc, rev_argv.argv, revs, NULL); |
632 | /* XXX leak rev_argv, as "revs" may still be pointing to it */ | |
3b437b0d CC |
633 | } |
634 | ||
a22347c6 | 635 | static void bisect_common(struct rev_info *revs) |
2ace9727 | 636 | { |
2ace9727 CC |
637 | if (prepare_revision_walk(revs)) |
638 | die("revision walk setup failed"); | |
639 | if (revs->tree_objects) | |
e76a5fb4 | 640 | mark_edges_uninteresting(revs, NULL); |
2ace9727 CC |
641 | } |
642 | ||
ef24c7ca | 643 | static void exit_if_skipped_commits(struct commit_list *tried, |
3c5ff995 | 644 | const struct object_id *bad) |
ef24c7ca CC |
645 | { |
646 | if (!tried) | |
647 | return; | |
648 | ||
649 | printf("There are only 'skip'ped commits left to test.\n" | |
43f9d9f3 | 650 | "The first %s commit could be any of:\n", term_bad); |
54307ea7 JH |
651 | |
652 | for ( ; tried; tried = tried->next) | |
653 | printf("%s\n", oid_to_hex(&tried->item->object.oid)); | |
654 | ||
ef24c7ca | 655 | if (bad) |
3c5ff995 | 656 | printf("%s\n", oid_to_hex(bad)); |
14dc4899 | 657 | printf(_("We cannot bisect more!\n")); |
ef24c7ca CC |
658 | exit(2); |
659 | } | |
660 | ||
3c5ff995 | 661 | static int is_expected_rev(const struct object_id *oid) |
c0537662 | 662 | { |
f932729c | 663 | const char *filename = git_path_bisect_expected_rev(); |
c0537662 CC |
664 | struct stat st; |
665 | struct strbuf str = STRBUF_INIT; | |
666 | FILE *fp; | |
667 | int res = 0; | |
668 | ||
669 | if (stat(filename, &st) || !S_ISREG(st.st_mode)) | |
670 | return 0; | |
671 | ||
672 | fp = fopen(filename, "r"); | |
673 | if (!fp) | |
674 | return 0; | |
675 | ||
8f309aeb | 676 | if (strbuf_getline_lf(&str, fp) != EOF) |
3c5ff995 | 677 | res = !strcmp(str.buf, oid_to_hex(oid)); |
c0537662 CC |
678 | |
679 | strbuf_release(&str); | |
680 | fclose(fp); | |
681 | ||
682 | return res; | |
683 | } | |
684 | ||
f3a97718 | 685 | static int bisect_checkout(const unsigned char *bisect_rev, int no_checkout) |
ef24c7ca | 686 | { |
f3a97718 | 687 | char bisect_rev_hex[GIT_SHA1_HEXSZ + 1]; |
ef24c7ca | 688 | |
f3a97718 DT |
689 | memcpy(bisect_rev_hex, sha1_to_hex(bisect_rev), GIT_SHA1_HEXSZ + 1); |
690 | update_ref(NULL, "BISECT_EXPECTED_REV", bisect_rev, NULL, 0, UPDATE_REFS_DIE_ON_ERR); | |
ef24c7ca CC |
691 | |
692 | argv_checkout[2] = bisect_rev_hex; | |
fee92fc1 | 693 | if (no_checkout) { |
f3a97718 | 694 | update_ref(NULL, "BISECT_HEAD", bisect_rev, NULL, 0, UPDATE_REFS_DIE_ON_ERR); |
fee92fc1 | 695 | } else { |
4824d1b8 | 696 | int res; |
fee92fc1 JS |
697 | res = run_command_v_opt(argv_checkout, RUN_GIT_CMD); |
698 | if (res) | |
699 | exit(res); | |
700 | } | |
ef24c7ca CC |
701 | |
702 | argv_show_branch[1] = bisect_rev_hex; | |
703 | return run_command_v_opt(argv_show_branch, RUN_GIT_CMD); | |
704 | } | |
705 | ||
c0537662 CC |
706 | static struct commit *get_commit_reference(const unsigned char *sha1) |
707 | { | |
708 | struct commit *r = lookup_commit_reference(sha1); | |
709 | if (!r) | |
14dc4899 | 710 | die(_("Not a valid commit name %s"), sha1_to_hex(sha1)); |
c0537662 CC |
711 | return r; |
712 | } | |
713 | ||
714 | static struct commit **get_bad_and_good_commits(int *rev_nr) | |
715 | { | |
b32fa95f | 716 | struct commit **rev; |
c0537662 CC |
717 | int i, n = 0; |
718 | ||
b32fa95f | 719 | ALLOC_ARRAY(rev, 1 + good_revs.nr); |
3c5ff995 | 720 | rev[n++] = get_commit_reference(current_bad_oid->hash); |
902bb364 | 721 | for (i = 0; i < good_revs.nr; i++) |
c0537662 CC |
722 | rev[n++] = get_commit_reference(good_revs.sha1[i]); |
723 | *rev_nr = n; | |
724 | ||
725 | return rev; | |
726 | } | |
727 | ||
728 | static void handle_bad_merge_base(void) | |
729 | { | |
3c5ff995 | 730 | if (is_expected_rev(current_bad_oid)) { |
731 | char *bad_hex = oid_to_hex(current_bad_oid); | |
c0537662 | 732 | char *good_hex = join_sha1_array_hex(&good_revs, ' '); |
43f9d9f3 | 733 | if (!strcmp(term_bad, "bad") && !strcmp(term_good, "good")) { |
14dc4899 | 734 | fprintf(stderr, _("The merge base %s is bad.\n" |
43f9d9f3 | 735 | "This means the bug has been fixed " |
14dc4899 | 736 | "between %s and [%s].\n"), |
43f9d9f3 | 737 | bad_hex, bad_hex, good_hex); |
21e5cfd8 | 738 | } else if (!strcmp(term_bad, "new") && !strcmp(term_good, "old")) { |
14dc4899 | 739 | fprintf(stderr, _("The merge base %s is new.\n" |
21e5cfd8 | 740 | "The property has changed " |
14dc4899 | 741 | "between %s and [%s].\n"), |
21e5cfd8 | 742 | bad_hex, bad_hex, good_hex); |
43f9d9f3 | 743 | } else { |
14dc4899 | 744 | fprintf(stderr, _("The merge base %s is %s.\n" |
43f9d9f3 | 745 | "This means the first '%s' commit is " |
14dc4899 | 746 | "between %s and [%s].\n"), |
43f9d9f3 AD |
747 | bad_hex, term_bad, term_good, bad_hex, good_hex); |
748 | } | |
c0537662 CC |
749 | exit(3); |
750 | } | |
751 | ||
3f407b76 | 752 | fprintf(stderr, _("Some %s revs are not ancestors of the %s rev.\n" |
c0537662 | 753 | "git bisect cannot work properly in this case.\n" |
14dc4899 | 754 | "Maybe you mistook %s and %s revs?\n"), |
43f9d9f3 | 755 | term_good, term_bad, term_good, term_bad); |
c0537662 CC |
756 | exit(1); |
757 | } | |
758 | ||
2af202be | 759 | static void handle_skipped_merge_base(const unsigned char *mb) |
c0537662 CC |
760 | { |
761 | char *mb_hex = sha1_to_hex(mb); | |
c368dde9 | 762 | char *bad_hex = oid_to_hex(current_bad_oid); |
c0537662 CC |
763 | char *good_hex = join_sha1_array_hex(&good_revs, ' '); |
764 | ||
14dc4899 | 765 | warning(_("the merge base between %s and [%s] " |
c0537662 | 766 | "must be skipped.\n" |
43f9d9f3 | 767 | "So we cannot be sure the first %s commit is " |
c0537662 | 768 | "between %s and %s.\n" |
14dc4899 | 769 | "We continue anyway."), |
43f9d9f3 | 770 | bad_hex, good_hex, term_bad, mb_hex, bad_hex); |
c0537662 CC |
771 | free(good_hex); |
772 | } | |
773 | ||
774 | /* | |
21e5cfd8 | 775 | * "check_merge_bases" checks that merge bases are not "bad" (or "new"). |
c0537662 | 776 | * |
21e5cfd8 | 777 | * - If one is "bad" (or "new"), it means the user assumed something wrong |
c0537662 | 778 | * and we must exit with a non 0 error code. |
21e5cfd8 | 779 | * - If one is "good" (or "old"), that's good, we have nothing to do. |
c0537662 CC |
780 | * - If one is "skipped", we can't know but we should warn. |
781 | * - If we don't know, we should check it out and ask the user to test. | |
782 | */ | |
fee92fc1 | 783 | static void check_merge_bases(int no_checkout) |
c0537662 CC |
784 | { |
785 | struct commit_list *result; | |
786 | int rev_nr; | |
787 | struct commit **rev = get_bad_and_good_commits(&rev_nr); | |
788 | ||
2ce406cc | 789 | result = get_merge_bases_many(rev[0], rev_nr - 1, rev + 1); |
c0537662 CC |
790 | |
791 | for (; result; result = result->next) { | |
ed1c9977 | 792 | const unsigned char *mb = result->item->object.oid.hash; |
3c5ff995 | 793 | if (!hashcmp(mb, current_bad_oid->hash)) { |
c0537662 | 794 | handle_bad_merge_base(); |
902bb364 | 795 | } else if (0 <= sha1_array_lookup(&good_revs, mb)) { |
c0537662 | 796 | continue; |
902bb364 | 797 | } else if (0 <= sha1_array_lookup(&skipped_revs, mb)) { |
c0537662 CC |
798 | handle_skipped_merge_base(mb); |
799 | } else { | |
14dc4899 | 800 | printf(_("Bisecting: a merge base must be tested\n")); |
f3a97718 | 801 | exit(bisect_checkout(mb, no_checkout)); |
c0537662 CC |
802 | } |
803 | } | |
804 | ||
805 | free(rev); | |
806 | free_commit_list(result); | |
807 | } | |
808 | ||
2d938fc7 | 809 | static int check_ancestors(const char *prefix) |
d937d4ac | 810 | { |
2d938fc7 CC |
811 | struct rev_info revs; |
812 | struct object_array pending_copy; | |
86a0a408 | 813 | int res; |
d937d4ac | 814 | |
2d938fc7 | 815 | bisect_rev_setup(&revs, prefix, "^%s", "%s", 0); |
d937d4ac | 816 | |
2d938fc7 | 817 | /* Save pending objects, so they can be cleaned up later. */ |
353f5657 RS |
818 | pending_copy = revs.pending; |
819 | revs.leak_pending = 1; | |
2d938fc7 | 820 | |
353f5657 RS |
821 | /* |
822 | * bisect_common calls prepare_revision_walk right away, which | |
823 | * (together with .leak_pending = 1) makes us the sole owner of | |
824 | * the list of pending objects. | |
825 | */ | |
2d938fc7 CC |
826 | bisect_common(&revs); |
827 | res = (revs.commits != NULL); | |
828 | ||
829 | /* Clean up objects used, as they will be reused. */ | |
86a0a408 | 830 | clear_commit_marks_for_object_array(&pending_copy, ALL_REV_FLAGS); |
353f5657 | 831 | free(pending_copy.objects); |
d937d4ac | 832 | |
2d938fc7 | 833 | return res; |
d937d4ac CC |
834 | } |
835 | ||
836 | /* | |
837 | * "check_good_are_ancestors_of_bad" checks that all "good" revs are | |
838 | * ancestor of the "bad" rev. | |
839 | * | |
840 | * If that's not the case, we need to check the merge bases. | |
841 | * If a merge base must be tested by the user, its source code will be | |
842 | * checked out to be tested by the user and we will exit. | |
843 | */ | |
fee92fc1 | 844 | static void check_good_are_ancestors_of_bad(const char *prefix, int no_checkout) |
d937d4ac | 845 | { |
d292bfaf | 846 | char *filename = git_pathdup("BISECT_ANCESTORS_OK"); |
d937d4ac CC |
847 | struct stat st; |
848 | int fd; | |
849 | ||
3c5ff995 | 850 | if (!current_bad_oid) |
14dc4899 | 851 | die(_("a %s revision is needed"), term_bad); |
d937d4ac CC |
852 | |
853 | /* Check if file BISECT_ANCESTORS_OK exists. */ | |
854 | if (!stat(filename, &st) && S_ISREG(st.st_mode)) | |
144e7090 | 855 | goto done; |
d937d4ac CC |
856 | |
857 | /* Bisecting with no good rev is ok. */ | |
902bb364 | 858 | if (good_revs.nr == 0) |
144e7090 | 859 | goto done; |
d937d4ac | 860 | |
2d938fc7 CC |
861 | /* Check if all good revs are ancestor of the bad rev. */ |
862 | if (check_ancestors(prefix)) | |
fee92fc1 | 863 | check_merge_bases(no_checkout); |
d937d4ac CC |
864 | |
865 | /* Create file BISECT_ANCESTORS_OK. */ | |
866 | fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, 0600); | |
867 | if (fd < 0) | |
14dc4899 | 868 | warning_errno(_("could not create file '%s'"), |
23e7a312 | 869 | filename); |
d937d4ac CC |
870 | else |
871 | close(fd); | |
144e7090 MH |
872 | done: |
873 | free(filename); | |
d937d4ac CC |
874 | } |
875 | ||
e22278c0 CC |
876 | /* |
877 | * This does "git diff-tree --pretty COMMIT" without one fork+exec. | |
878 | */ | |
879 | static void show_diff_tree(const char *prefix, struct commit *commit) | |
880 | { | |
881 | struct rev_info opt; | |
882 | ||
883 | /* diff-tree init */ | |
884 | init_revisions(&opt, prefix); | |
885 | git_config(git_diff_basic_config, NULL); /* no "diff" UI options */ | |
886 | opt.abbrev = 0; | |
887 | opt.diff = 1; | |
888 | ||
889 | /* This is what "--pretty" does */ | |
890 | opt.verbose_header = 1; | |
891 | opt.use_terminator = 0; | |
892 | opt.commit_format = CMIT_FMT_DEFAULT; | |
893 | ||
894 | /* diff-tree init */ | |
895 | if (!opt.diffopt.output_format) | |
896 | opt.diffopt.output_format = DIFF_FORMAT_RAW; | |
897 | ||
43ec5509 | 898 | setup_revisions(0, NULL, &opt, NULL); |
e22278c0 CC |
899 | log_tree_commit(&opt, commit); |
900 | } | |
901 | ||
cb46d630 AD |
902 | /* |
903 | * The terms used for this bisect session are stored in BISECT_TERMS. | |
904 | * We read them and store them to adapt the messages accordingly. | |
905 | * Default is bad/good. | |
906 | */ | |
907 | void read_bisect_terms(const char **read_bad, const char **read_good) | |
908 | { | |
909 | struct strbuf str = STRBUF_INIT; | |
910 | const char *filename = git_path("BISECT_TERMS"); | |
911 | FILE *fp = fopen(filename, "r"); | |
912 | ||
913 | if (!fp) { | |
914 | if (errno == ENOENT) { | |
915 | *read_bad = "bad"; | |
916 | *read_good = "good"; | |
917 | return; | |
918 | } else { | |
14dc4899 | 919 | die_errno(_("could not read file '%s'"), filename); |
cb46d630 AD |
920 | } |
921 | } else { | |
8f309aeb | 922 | strbuf_getline_lf(&str, fp); |
cb46d630 | 923 | *read_bad = strbuf_detach(&str, NULL); |
8f309aeb | 924 | strbuf_getline_lf(&str, fp); |
cb46d630 AD |
925 | *read_good = strbuf_detach(&str, NULL); |
926 | } | |
927 | strbuf_release(&str); | |
928 | fclose(fp); | |
929 | } | |
930 | ||
ef24c7ca CC |
931 | /* |
932 | * We use the convention that exiting with an exit code 10 means that | |
933 | * the bisection process finished successfully. | |
934 | * In this case the calling shell script should exit 0. | |
fee92fc1 JS |
935 | * |
936 | * If no_checkout is non-zero, the bisection process does not | |
937 | * checkout the trial commit but instead simply updates BISECT_HEAD. | |
ef24c7ca | 938 | */ |
fee92fc1 | 939 | int bisect_next_all(const char *prefix, int no_checkout) |
ef24c7ca CC |
940 | { |
941 | struct rev_info revs; | |
942 | struct commit_list *tried; | |
6329bade | 943 | int reaches = 0, all = 0, nr, steps; |
ef24c7ca | 944 | const unsigned char *bisect_rev; |
2cfa8357 | 945 | char *steps_msg; |
ef24c7ca | 946 | |
cb46d630 | 947 | read_bisect_terms(&term_bad, &term_good); |
2b020695 | 948 | if (read_bisect_refs()) |
14dc4899 | 949 | die(_("reading bisect refs failed")); |
2b020695 | 950 | |
fee92fc1 | 951 | check_good_are_ancestors_of_bad(prefix, no_checkout); |
0871984d | 952 | |
a22347c6 CC |
953 | bisect_rev_setup(&revs, prefix, "%s", "^%s", 1); |
954 | revs.limited = 1; | |
2b020695 | 955 | |
a22347c6 | 956 | bisect_common(&revs); |
ef24c7ca | 957 | |
a22347c6 | 958 | revs.commits = find_bisection(revs.commits, &reaches, &all, |
902bb364 | 959 | !!skipped_revs.nr); |
62d0b0da | 960 | revs.commits = managed_skipped(revs.commits, &tried); |
ef24c7ca CC |
961 | |
962 | if (!revs.commits) { | |
963 | /* | |
964 | * We should exit here only if the "bad" | |
965 | * commit is also a "skip" commit. | |
966 | */ | |
967 | exit_if_skipped_commits(tried, NULL); | |
968 | ||
14dc4899 | 969 | printf(_("%s was both %s and %s\n"), |
43f9d9f3 AD |
970 | oid_to_hex(current_bad_oid), |
971 | term_good, | |
972 | term_bad); | |
ef24c7ca CC |
973 | exit(1); |
974 | } | |
975 | ||
8f69f72f | 976 | if (!all) { |
14dc4899 VA |
977 | fprintf(stderr, _("No testable commit found.\n" |
978 | "Maybe you started with bad path parameters?\n")); | |
8f69f72f CC |
979 | exit(4); |
980 | } | |
981 | ||
ed1c9977 | 982 | bisect_rev = revs.commits->item->object.oid.hash; |
ef24c7ca | 983 | |
3c5ff995 | 984 | if (!hashcmp(bisect_rev, current_bad_oid->hash)) { |
985 | exit_if_skipped_commits(tried, current_bad_oid); | |
080cc646 | 986 | printf("%s is the first %s commit\n", sha1_to_hex(bisect_rev), |
43f9d9f3 | 987 | term_bad); |
e22278c0 | 988 | show_diff_tree(prefix, revs.commits->item); |
ef24c7ca CC |
989 | /* This means the bisection process succeeded. */ |
990 | exit(10); | |
991 | } | |
992 | ||
993 | nr = all - reaches - 1; | |
6329bade | 994 | steps = estimate_bisect_steps(all); |
2cfa8357 MM |
995 | |
996 | steps_msg = xstrfmt(Q_("(roughly %d step)", "(roughly %d steps)", | |
997 | steps), steps); | |
14dc4899 VA |
998 | /* TRANSLATORS: the last %s will be replaced with |
999 | "(roughly %d steps)" translation */ | |
1000 | printf(Q_("Bisecting: %d revision left to test after this %s\n", | |
1001 | "Bisecting: %d revisions left to test after this %s\n", | |
1002 | nr), nr, steps_msg); | |
2cfa8357 | 1003 | free(steps_msg); |
ef24c7ca | 1004 | |
f3a97718 | 1005 | return bisect_checkout(bisect_rev, no_checkout); |
ef24c7ca CC |
1006 | } |
1007 | ||
c43cb386 NTND |
1008 | static inline int log2i(int n) |
1009 | { | |
1010 | int log2 = 0; | |
1011 | ||
1012 | for (; n > 1; n >>= 1) | |
1013 | log2++; | |
1014 | ||
1015 | return log2; | |
1016 | } | |
1017 | ||
1018 | static inline int exp2i(int n) | |
1019 | { | |
1020 | return 1 << n; | |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | * Estimate the number of bisect steps left (after the current step) | |
1025 | * | |
1026 | * For any x between 0 included and 2^n excluded, the probability for | |
1027 | * n - 1 steps left looks like: | |
1028 | * | |
1029 | * P(2^n + x) == (2^n - x) / (2^n + x) | |
1030 | * | |
1031 | * and P(2^n + x) < 0.5 means 2^n < 3x | |
1032 | */ | |
1033 | int estimate_bisect_steps(int all) | |
1034 | { | |
1035 | int n, x, e; | |
1036 | ||
1037 | if (all < 3) | |
1038 | return 0; | |
1039 | ||
1040 | n = log2i(all); | |
1041 | e = exp2i(n); | |
1042 | x = all - e; | |
1043 | ||
1044 | return (e < 3 * x) ? n : n - 1; | |
1045 | } |