44576b79278107534f40cb2d3c7712b50e91fdc3
[git/git.git] / merge-recursive.c
1 /*
2 * Recursive Merge algorithm stolen from git-merge-recursive.py by
3 * Fredrik Kuivinen.
4 * The thieves were Alex Riesen and Johannes Schindelin, in June/July 2006
5 */
6 #include "advice.h"
7 #include "cache.h"
8 #include "cache-tree.h"
9 #include "commit.h"
10 #include "blob.h"
11 #include "builtin.h"
12 #include "tree-walk.h"
13 #include "diff.h"
14 #include "diffcore.h"
15 #include "tag.h"
16 #include "unpack-trees.h"
17 #include "string-list.h"
18 #include "xdiff-interface.h"
19 #include "ll-merge.h"
20 #include "attr.h"
21 #include "merge-recursive.h"
22 #include "dir.h"
23
24 static struct tree *shift_tree_object(struct tree *one, struct tree *two,
25 const char *subtree_shift)
26 {
27 unsigned char shifted[20];
28
29 if (!*subtree_shift) {
30 shift_tree(one->object.sha1, two->object.sha1, shifted, 0);
31 } else {
32 shift_tree_by(one->object.sha1, two->object.sha1, shifted,
33 subtree_shift);
34 }
35 if (!hashcmp(two->object.sha1, shifted))
36 return two;
37 return lookup_tree(shifted);
38 }
39
40 /*
41 * A virtual commit has (const char *)commit->util set to the name.
42 */
43
44 static struct commit *make_virtual_commit(struct tree *tree, const char *comment)
45 {
46 struct commit *commit = xcalloc(1, sizeof(struct commit));
47 commit->tree = tree;
48 commit->util = (void*)comment;
49 /* avoid warnings */
50 commit->object.parsed = 1;
51 return commit;
52 }
53
54 /*
55 * Since we use get_tree_entry(), which does not put the read object into
56 * the object pool, we cannot rely on a == b.
57 */
58 static int sha_eq(const unsigned char *a, const unsigned char *b)
59 {
60 if (!a && !b)
61 return 2;
62 return a && b && hashcmp(a, b) == 0;
63 }
64
65 /*
66 * Since we want to write the index eventually, we cannot reuse the index
67 * for these (temporary) data.
68 */
69 struct stage_data
70 {
71 struct
72 {
73 unsigned mode;
74 unsigned char sha[20];
75 } stages[4];
76 unsigned processed:1;
77 };
78
79 static int show(struct merge_options *o, int v)
80 {
81 return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5;
82 }
83
84 static void flush_output(struct merge_options *o)
85 {
86 if (o->obuf.len) {
87 fputs(o->obuf.buf, stdout);
88 strbuf_reset(&o->obuf);
89 }
90 }
91
92 __attribute__((format (printf, 3, 4)))
93 static void output(struct merge_options *o, int v, const char *fmt, ...)
94 {
95 int len;
96 va_list ap;
97
98 if (!show(o, v))
99 return;
100
101 strbuf_grow(&o->obuf, o->call_depth * 2 + 2);
102 memset(o->obuf.buf + o->obuf.len, ' ', o->call_depth * 2);
103 strbuf_setlen(&o->obuf, o->obuf.len + o->call_depth * 2);
104
105 va_start(ap, fmt);
106 len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap);
107 va_end(ap);
108
109 if (len < 0)
110 len = 0;
111 if (len >= strbuf_avail(&o->obuf)) {
112 strbuf_grow(&o->obuf, len + 2);
113 va_start(ap, fmt);
114 len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap);
115 va_end(ap);
116 if (len >= strbuf_avail(&o->obuf)) {
117 die("this should not happen, your snprintf is broken");
118 }
119 }
120 strbuf_setlen(&o->obuf, o->obuf.len + len);
121 strbuf_add(&o->obuf, "\n", 1);
122 if (!o->buffer_output)
123 flush_output(o);
124 }
125
126 static void output_commit_title(struct merge_options *o, struct commit *commit)
127 {
128 int i;
129 flush_output(o);
130 for (i = o->call_depth; i--;)
131 fputs(" ", stdout);
132 if (commit->util)
133 printf("virtual %s\n", (char *)commit->util);
134 else {
135 printf("%s ", find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV));
136 if (parse_commit(commit) != 0)
137 printf("(bad commit)\n");
138 else {
139 const char *s;
140 int len;
141 for (s = commit->buffer; *s; s++)
142 if (*s == '\n' && s[1] == '\n') {
143 s += 2;
144 break;
145 }
146 for (len = 0; s[len] && '\n' != s[len]; len++)
147 ; /* do nothing */
148 printf("%.*s\n", len, s);
149 }
150 }
151 }
152
153 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
154 const char *path, int stage, int refresh, int options)
155 {
156 struct cache_entry *ce;
157 ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage, refresh);
158 if (!ce)
159 return error("addinfo_cache failed for path '%s'", path);
160 return add_cache_entry(ce, options);
161 }
162
163 static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree)
164 {
165 parse_tree(tree);
166 init_tree_desc(desc, tree->buffer, tree->size);
167 }
168
169 static int git_merge_trees(int index_only,
170 struct tree *common,
171 struct tree *head,
172 struct tree *merge)
173 {
174 int rc;
175 struct tree_desc t[3];
176 struct unpack_trees_options opts;
177
178 memset(&opts, 0, sizeof(opts));
179 if (index_only)
180 opts.index_only = 1;
181 else
182 opts.update = 1;
183 opts.merge = 1;
184 opts.head_idx = 2;
185 opts.fn = threeway_merge;
186 opts.src_index = &the_index;
187 opts.dst_index = &the_index;
188 opts.msgs = get_porcelain_error_msgs();
189
190 init_tree_desc_from_tree(t+0, common);
191 init_tree_desc_from_tree(t+1, head);
192 init_tree_desc_from_tree(t+2, merge);
193
194 rc = unpack_trees(3, t, &opts);
195 cache_tree_free(&active_cache_tree);
196 return rc;
197 }
198
199 struct tree *write_tree_from_memory(struct merge_options *o)
200 {
201 struct tree *result = NULL;
202
203 if (unmerged_cache()) {
204 int i;
205 fprintf(stderr, "BUG: There are unmerged index entries:\n");
206 for (i = 0; i < active_nr; i++) {
207 struct cache_entry *ce = active_cache[i];
208 if (ce_stage(ce))
209 fprintf(stderr, "BUG: %d %.*s", ce_stage(ce),
210 (int)ce_namelen(ce), ce->name);
211 }
212 die("Bug in merge-recursive.c");
213 }
214
215 if (!active_cache_tree)
216 active_cache_tree = cache_tree();
217
218 if (!cache_tree_fully_valid(active_cache_tree) &&
219 cache_tree_update(active_cache_tree,
220 active_cache, active_nr, 0, 0) < 0)
221 die("error building trees");
222
223 result = lookup_tree(active_cache_tree->sha1);
224
225 return result;
226 }
227
228 static int save_files_dirs(const unsigned char *sha1,
229 const char *base, int baselen, const char *path,
230 unsigned int mode, int stage, void *context)
231 {
232 int len = strlen(path);
233 char *newpath = xmalloc(baselen + len + 1);
234 struct merge_options *o = context;
235
236 memcpy(newpath, base, baselen);
237 memcpy(newpath + baselen, path, len);
238 newpath[baselen + len] = '\0';
239
240 if (S_ISDIR(mode))
241 string_list_insert(newpath, &o->current_directory_set);
242 else
243 string_list_insert(newpath, &o->current_file_set);
244 free(newpath);
245
246 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
247 }
248
249 static int get_files_dirs(struct merge_options *o, struct tree *tree)
250 {
251 int n;
252 if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs, o))
253 return 0;
254 n = o->current_file_set.nr + o->current_directory_set.nr;
255 return n;
256 }
257
258 /*
259 * Returns an index_entry instance which doesn't have to correspond to
260 * a real cache entry in Git's index.
261 */
262 static struct stage_data *insert_stage_data(const char *path,
263 struct tree *o, struct tree *a, struct tree *b,
264 struct string_list *entries)
265 {
266 struct string_list_item *item;
267 struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
268 get_tree_entry(o->object.sha1, path,
269 e->stages[1].sha, &e->stages[1].mode);
270 get_tree_entry(a->object.sha1, path,
271 e->stages[2].sha, &e->stages[2].mode);
272 get_tree_entry(b->object.sha1, path,
273 e->stages[3].sha, &e->stages[3].mode);
274 item = string_list_insert(path, entries);
275 item->util = e;
276 return e;
277 }
278
279 /*
280 * Create a dictionary mapping file names to stage_data objects. The
281 * dictionary contains one entry for every path with a non-zero stage entry.
282 */
283 static struct string_list *get_unmerged(void)
284 {
285 struct string_list *unmerged = xcalloc(1, sizeof(struct string_list));
286 int i;
287
288 unmerged->strdup_strings = 1;
289
290 for (i = 0; i < active_nr; i++) {
291 struct string_list_item *item;
292 struct stage_data *e;
293 struct cache_entry *ce = active_cache[i];
294 if (!ce_stage(ce))
295 continue;
296
297 item = string_list_lookup(ce->name, unmerged);
298 if (!item) {
299 item = string_list_insert(ce->name, unmerged);
300 item->util = xcalloc(1, sizeof(struct stage_data));
301 }
302 e = item->util;
303 e->stages[ce_stage(ce)].mode = ce->ce_mode;
304 hashcpy(e->stages[ce_stage(ce)].sha, ce->sha1);
305 }
306
307 return unmerged;
308 }
309
310 struct rename
311 {
312 struct diff_filepair *pair;
313 struct stage_data *src_entry;
314 struct stage_data *dst_entry;
315 unsigned processed:1;
316 };
317
318 /*
319 * Get information of all renames which occurred between 'o_tree' and
320 * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
321 * 'b_tree') to be able to associate the correct cache entries with
322 * the rename information. 'tree' is always equal to either a_tree or b_tree.
323 */
324 static struct string_list *get_renames(struct merge_options *o,
325 struct tree *tree,
326 struct tree *o_tree,
327 struct tree *a_tree,
328 struct tree *b_tree,
329 struct string_list *entries)
330 {
331 int i;
332 struct string_list *renames;
333 struct diff_options opts;
334
335 renames = xcalloc(1, sizeof(struct string_list));
336 diff_setup(&opts);
337 DIFF_OPT_SET(&opts, RECURSIVE);
338 opts.detect_rename = DIFF_DETECT_RENAME;
339 opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
340 o->diff_rename_limit >= 0 ? o->diff_rename_limit :
341 500;
342 opts.warn_on_too_large_rename = 1;
343 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
344 if (diff_setup_done(&opts) < 0)
345 die("diff setup failed");
346 diff_tree_sha1(o_tree->object.sha1, tree->object.sha1, "", &opts);
347 diffcore_std(&opts);
348 for (i = 0; i < diff_queued_diff.nr; ++i) {
349 struct string_list_item *item;
350 struct rename *re;
351 struct diff_filepair *pair = diff_queued_diff.queue[i];
352 if (pair->status != 'R') {
353 diff_free_filepair(pair);
354 continue;
355 }
356 re = xmalloc(sizeof(*re));
357 re->processed = 0;
358 re->pair = pair;
359 item = string_list_lookup(re->pair->one->path, entries);
360 if (!item)
361 re->src_entry = insert_stage_data(re->pair->one->path,
362 o_tree, a_tree, b_tree, entries);
363 else
364 re->src_entry = item->util;
365
366 item = string_list_lookup(re->pair->two->path, entries);
367 if (!item)
368 re->dst_entry = insert_stage_data(re->pair->two->path,
369 o_tree, a_tree, b_tree, entries);
370 else
371 re->dst_entry = item->util;
372 item = string_list_insert(pair->one->path, renames);
373 item->util = re;
374 }
375 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
376 diff_queued_diff.nr = 0;
377 diff_flush(&opts);
378 return renames;
379 }
380
381 static int update_stages(const char *path, struct diff_filespec *o,
382 struct diff_filespec *a, struct diff_filespec *b,
383 int clear)
384 {
385 int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE;
386 if (clear)
387 if (remove_file_from_cache(path))
388 return -1;
389 if (o)
390 if (add_cacheinfo(o->mode, o->sha1, path, 1, 0, options))
391 return -1;
392 if (a)
393 if (add_cacheinfo(a->mode, a->sha1, path, 2, 0, options))
394 return -1;
395 if (b)
396 if (add_cacheinfo(b->mode, b->sha1, path, 3, 0, options))
397 return -1;
398 return 0;
399 }
400
401 static int remove_file(struct merge_options *o, int clean,
402 const char *path, int no_wd)
403 {
404 int update_cache = o->call_depth || clean;
405 int update_working_directory = !o->call_depth && !no_wd;
406
407 if (update_cache) {
408 if (remove_file_from_cache(path))
409 return -1;
410 }
411 if (update_working_directory) {
412 if (remove_path(path))
413 return -1;
414 }
415 return 0;
416 }
417
418 static char *unique_path(struct merge_options *o, const char *path, const char *branch)
419 {
420 char *newpath = xmalloc(strlen(path) + 1 + strlen(branch) + 8 + 1);
421 int suffix = 0;
422 struct stat st;
423 char *p = newpath + strlen(path);
424 strcpy(newpath, path);
425 *(p++) = '~';
426 strcpy(p, branch);
427 for (; *p; ++p)
428 if ('/' == *p)
429 *p = '_';
430 while (string_list_has_string(&o->current_file_set, newpath) ||
431 string_list_has_string(&o->current_directory_set, newpath) ||
432 lstat(newpath, &st) == 0)
433 sprintf(p, "_%d", suffix++);
434
435 string_list_insert(newpath, &o->current_file_set);
436 return newpath;
437 }
438
439 static void flush_buffer(int fd, const char *buf, unsigned long size)
440 {
441 while (size > 0) {
442 long ret = write_in_full(fd, buf, size);
443 if (ret < 0) {
444 /* Ignore epipe */
445 if (errno == EPIPE)
446 break;
447 die_errno("merge-recursive");
448 } else if (!ret) {
449 die("merge-recursive: disk full?");
450 }
451 size -= ret;
452 buf += ret;
453 }
454 }
455
456 static int would_lose_untracked(const char *path)
457 {
458 int pos = cache_name_pos(path, strlen(path));
459
460 if (pos < 0)
461 pos = -1 - pos;
462 while (pos < active_nr &&
463 !strcmp(path, active_cache[pos]->name)) {
464 /*
465 * If stage #0, it is definitely tracked.
466 * If it has stage #2 then it was tracked
467 * before this merge started. All other
468 * cases the path was not tracked.
469 */
470 switch (ce_stage(active_cache[pos])) {
471 case 0:
472 case 2:
473 return 0;
474 }
475 pos++;
476 }
477 return file_exists(path);
478 }
479
480 static int make_room_for_path(const char *path)
481 {
482 int status;
483 const char *msg = "failed to create path '%s'%s";
484
485 status = safe_create_leading_directories_const(path);
486 if (status) {
487 if (status == -3) {
488 /* something else exists */
489 error(msg, path, ": perhaps a D/F conflict?");
490 return -1;
491 }
492 die(msg, path, "");
493 }
494
495 /*
496 * Do not unlink a file in the work tree if we are not
497 * tracking it.
498 */
499 if (would_lose_untracked(path))
500 return error("refusing to lose untracked file at '%s'",
501 path);
502
503 /* Successful unlink is good.. */
504 if (!unlink(path))
505 return 0;
506 /* .. and so is no existing file */
507 if (errno == ENOENT)
508 return 0;
509 /* .. but not some other error (who really cares what?) */
510 return error(msg, path, ": perhaps a D/F conflict?");
511 }
512
513 static void update_file_flags(struct merge_options *o,
514 const unsigned char *sha,
515 unsigned mode,
516 const char *path,
517 int update_cache,
518 int update_wd)
519 {
520 if (o->call_depth)
521 update_wd = 0;
522
523 if (update_wd) {
524 enum object_type type;
525 void *buf;
526 unsigned long size;
527
528 if (S_ISGITLINK(mode))
529 /*
530 * We may later decide to recursively descend into
531 * the submodule directory and update its index
532 * and/or work tree, but we do not do that now.
533 */
534 goto update_index;
535
536 buf = read_sha1_file(sha, &type, &size);
537 if (!buf)
538 die("cannot read object %s '%s'", sha1_to_hex(sha), path);
539 if (type != OBJ_BLOB)
540 die("blob expected for %s '%s'", sha1_to_hex(sha), path);
541 if (S_ISREG(mode)) {
542 struct strbuf strbuf = STRBUF_INIT;
543 if (convert_to_working_tree(path, buf, size, &strbuf)) {
544 free(buf);
545 size = strbuf.len;
546 buf = strbuf_detach(&strbuf, NULL);
547 }
548 }
549
550 if (make_room_for_path(path) < 0) {
551 update_wd = 0;
552 free(buf);
553 goto update_index;
554 }
555 if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
556 int fd;
557 if (mode & 0100)
558 mode = 0777;
559 else
560 mode = 0666;
561 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
562 if (fd < 0)
563 die_errno("failed to open '%s'", path);
564 flush_buffer(fd, buf, size);
565 close(fd);
566 } else if (S_ISLNK(mode)) {
567 char *lnk = xmemdupz(buf, size);
568 safe_create_leading_directories_const(path);
569 unlink(path);
570 if (symlink(lnk, path))
571 die_errno("failed to symlink '%s'", path);
572 free(lnk);
573 } else
574 die("do not know what to do with %06o %s '%s'",
575 mode, sha1_to_hex(sha), path);
576 free(buf);
577 }
578 update_index:
579 if (update_cache)
580 add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
581 }
582
583 static void update_file(struct merge_options *o,
584 int clean,
585 const unsigned char *sha,
586 unsigned mode,
587 const char *path)
588 {
589 update_file_flags(o, sha, mode, path, o->call_depth || clean, !o->call_depth);
590 }
591
592 /* Low level file merging, update and removal */
593
594 struct merge_file_info
595 {
596 unsigned char sha[20];
597 unsigned mode;
598 unsigned clean:1,
599 merge:1;
600 };
601
602 static int merge_3way(struct merge_options *o,
603 mmbuffer_t *result_buf,
604 struct diff_filespec *one,
605 struct diff_filespec *a,
606 struct diff_filespec *b,
607 const char *branch1,
608 const char *branch2)
609 {
610 mmfile_t orig, src1, src2;
611 char *base_name, *name1, *name2;
612 int merge_status;
613 int favor;
614
615 if (o->call_depth)
616 favor = 0;
617 else {
618 switch (o->recursive_variant) {
619 case MERGE_RECURSIVE_OURS:
620 favor = XDL_MERGE_FAVOR_OURS;
621 break;
622 case MERGE_RECURSIVE_THEIRS:
623 favor = XDL_MERGE_FAVOR_THEIRS;
624 break;
625 default:
626 favor = 0;
627 break;
628 }
629 }
630
631 if (strcmp(a->path, b->path) ||
632 (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) {
633 base_name = o->ancestor == NULL ? NULL :
634 xstrdup(mkpath("%s:%s", o->ancestor, one->path));
635 name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
636 name2 = xstrdup(mkpath("%s:%s", branch2, b->path));
637 } else {
638 base_name = o->ancestor == NULL ? NULL :
639 xstrdup(mkpath("%s", o->ancestor));
640 name1 = xstrdup(mkpath("%s", branch1));
641 name2 = xstrdup(mkpath("%s", branch2));
642 }
643
644 read_mmblob(&orig, one->sha1);
645 read_mmblob(&src1, a->sha1);
646 read_mmblob(&src2, b->sha1);
647
648 merge_status = ll_merge(result_buf, a->path, &orig, base_name,
649 &src1, name1, &src2, name2,
650 ((o->call_depth ? LL_OPT_VIRTUAL_ANCESTOR : 0) |
651 (o->renormalize ? LL_OPT_RENORMALIZE : 0) |
652 create_ll_flag(favor)));
653
654 free(name1);
655 free(name2);
656 free(orig.ptr);
657 free(src1.ptr);
658 free(src2.ptr);
659 return merge_status;
660 }
661
662 static struct merge_file_info merge_file(struct merge_options *o,
663 struct diff_filespec *one,
664 struct diff_filespec *a,
665 struct diff_filespec *b,
666 const char *branch1,
667 const char *branch2)
668 {
669 struct merge_file_info result;
670 result.merge = 0;
671 result.clean = 1;
672
673 if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) {
674 result.clean = 0;
675 if (S_ISREG(a->mode)) {
676 result.mode = a->mode;
677 hashcpy(result.sha, a->sha1);
678 } else {
679 result.mode = b->mode;
680 hashcpy(result.sha, b->sha1);
681 }
682 } else {
683 if (!sha_eq(a->sha1, one->sha1) && !sha_eq(b->sha1, one->sha1))
684 result.merge = 1;
685
686 /*
687 * Merge modes
688 */
689 if (a->mode == b->mode || a->mode == one->mode)
690 result.mode = b->mode;
691 else {
692 result.mode = a->mode;
693 if (b->mode != one->mode) {
694 result.clean = 0;
695 result.merge = 1;
696 }
697 }
698
699 if (sha_eq(a->sha1, b->sha1) || sha_eq(a->sha1, one->sha1))
700 hashcpy(result.sha, b->sha1);
701 else if (sha_eq(b->sha1, one->sha1))
702 hashcpy(result.sha, a->sha1);
703 else if (S_ISREG(a->mode)) {
704 mmbuffer_t result_buf;
705 int merge_status;
706
707 merge_status = merge_3way(o, &result_buf, one, a, b,
708 branch1, branch2);
709
710 if ((merge_status < 0) || !result_buf.ptr)
711 die("Failed to execute internal merge");
712
713 if (write_sha1_file(result_buf.ptr, result_buf.size,
714 blob_type, result.sha))
715 die("Unable to add %s to database",
716 a->path);
717
718 free(result_buf.ptr);
719 result.clean = (merge_status == 0);
720 } else if (S_ISGITLINK(a->mode)) {
721 result.clean = 0;
722 hashcpy(result.sha, a->sha1);
723 } else if (S_ISLNK(a->mode)) {
724 hashcpy(result.sha, a->sha1);
725
726 if (!sha_eq(a->sha1, b->sha1))
727 result.clean = 0;
728 } else {
729 die("unsupported object type in the tree");
730 }
731 }
732
733 return result;
734 }
735
736 static void conflict_rename_rename(struct merge_options *o,
737 struct rename *ren1,
738 const char *branch1,
739 struct rename *ren2,
740 const char *branch2)
741 {
742 char *del[2];
743 int delp = 0;
744 const char *ren1_dst = ren1->pair->two->path;
745 const char *ren2_dst = ren2->pair->two->path;
746 const char *dst_name1 = ren1_dst;
747 const char *dst_name2 = ren2_dst;
748 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
749 dst_name1 = del[delp++] = unique_path(o, ren1_dst, branch1);
750 output(o, 1, "%s is a directory in %s adding as %s instead",
751 ren1_dst, branch2, dst_name1);
752 remove_file(o, 0, ren1_dst, 0);
753 }
754 if (string_list_has_string(&o->current_directory_set, ren2_dst)) {
755 dst_name2 = del[delp++] = unique_path(o, ren2_dst, branch2);
756 output(o, 1, "%s is a directory in %s adding as %s instead",
757 ren2_dst, branch1, dst_name2);
758 remove_file(o, 0, ren2_dst, 0);
759 }
760 if (o->call_depth) {
761 remove_file_from_cache(dst_name1);
762 remove_file_from_cache(dst_name2);
763 /*
764 * Uncomment to leave the conflicting names in the resulting tree
765 *
766 * update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, dst_name1);
767 * update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, dst_name2);
768 */
769 } else {
770 update_stages(dst_name1, NULL, ren1->pair->two, NULL, 1);
771 update_stages(dst_name2, NULL, NULL, ren2->pair->two, 1);
772 }
773 while (delp--)
774 free(del[delp]);
775 }
776
777 static void conflict_rename_dir(struct merge_options *o,
778 struct rename *ren1,
779 const char *branch1)
780 {
781 char *new_path = unique_path(o, ren1->pair->two->path, branch1);
782 output(o, 1, "Renaming %s to %s instead", ren1->pair->one->path, new_path);
783 remove_file(o, 0, ren1->pair->two->path, 0);
784 update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path);
785 free(new_path);
786 }
787
788 static void conflict_rename_rename_2(struct merge_options *o,
789 struct rename *ren1,
790 const char *branch1,
791 struct rename *ren2,
792 const char *branch2)
793 {
794 char *new_path1 = unique_path(o, ren1->pair->two->path, branch1);
795 char *new_path2 = unique_path(o, ren2->pair->two->path, branch2);
796 output(o, 1, "Renaming %s to %s and %s to %s instead",
797 ren1->pair->one->path, new_path1,
798 ren2->pair->one->path, new_path2);
799 remove_file(o, 0, ren1->pair->two->path, 0);
800 update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path1);
801 update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, new_path2);
802 free(new_path2);
803 free(new_path1);
804 }
805
806 static int process_renames(struct merge_options *o,
807 struct string_list *a_renames,
808 struct string_list *b_renames)
809 {
810 int clean_merge = 1, i, j;
811 struct string_list a_by_dst = {NULL, 0, 0, 0}, b_by_dst = {NULL, 0, 0, 0};
812 const struct rename *sre;
813
814 for (i = 0; i < a_renames->nr; i++) {
815 sre = a_renames->items[i].util;
816 string_list_insert(sre->pair->two->path, &a_by_dst)->util
817 = sre->dst_entry;
818 }
819 for (i = 0; i < b_renames->nr; i++) {
820 sre = b_renames->items[i].util;
821 string_list_insert(sre->pair->two->path, &b_by_dst)->util
822 = sre->dst_entry;
823 }
824
825 for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
826 char *src;
827 struct string_list *renames1, *renames2Dst;
828 struct rename *ren1 = NULL, *ren2 = NULL;
829 const char *branch1, *branch2;
830 const char *ren1_src, *ren1_dst;
831
832 if (i >= a_renames->nr) {
833 ren2 = b_renames->items[j++].util;
834 } else if (j >= b_renames->nr) {
835 ren1 = a_renames->items[i++].util;
836 } else {
837 int compare = strcmp(a_renames->items[i].string,
838 b_renames->items[j].string);
839 if (compare <= 0)
840 ren1 = a_renames->items[i++].util;
841 if (compare >= 0)
842 ren2 = b_renames->items[j++].util;
843 }
844
845 /* TODO: refactor, so that 1/2 are not needed */
846 if (ren1) {
847 renames1 = a_renames;
848 renames2Dst = &b_by_dst;
849 branch1 = o->branch1;
850 branch2 = o->branch2;
851 } else {
852 struct rename *tmp;
853 renames1 = b_renames;
854 renames2Dst = &a_by_dst;
855 branch1 = o->branch2;
856 branch2 = o->branch1;
857 tmp = ren2;
858 ren2 = ren1;
859 ren1 = tmp;
860 }
861 src = ren1->pair->one->path;
862
863 ren1->dst_entry->processed = 1;
864 ren1->src_entry->processed = 1;
865
866 if (ren1->processed)
867 continue;
868 ren1->processed = 1;
869
870 ren1_src = ren1->pair->one->path;
871 ren1_dst = ren1->pair->two->path;
872
873 if (ren2) {
874 const char *ren2_src = ren2->pair->one->path;
875 const char *ren2_dst = ren2->pair->two->path;
876 /* Renamed in 1 and renamed in 2 */
877 if (strcmp(ren1_src, ren2_src) != 0)
878 die("ren1.src != ren2.src");
879 ren2->dst_entry->processed = 1;
880 ren2->processed = 1;
881 if (strcmp(ren1_dst, ren2_dst) != 0) {
882 clean_merge = 0;
883 output(o, 1, "CONFLICT (rename/rename): "
884 "Rename \"%s\"->\"%s\" in branch \"%s\" "
885 "rename \"%s\"->\"%s\" in \"%s\"%s",
886 src, ren1_dst, branch1,
887 src, ren2_dst, branch2,
888 o->call_depth ? " (left unresolved)": "");
889 if (o->call_depth) {
890 remove_file_from_cache(src);
891 update_file(o, 0, ren1->pair->one->sha1,
892 ren1->pair->one->mode, src);
893 }
894 conflict_rename_rename(o, ren1, branch1, ren2, branch2);
895 } else {
896 struct merge_file_info mfi;
897 remove_file(o, 1, ren1_src, 1);
898 mfi = merge_file(o,
899 ren1->pair->one,
900 ren1->pair->two,
901 ren2->pair->two,
902 branch1,
903 branch2);
904 if (mfi.merge || !mfi.clean)
905 output(o, 1, "Renaming %s->%s", src, ren1_dst);
906
907 if (mfi.merge)
908 output(o, 2, "Auto-merging %s", ren1_dst);
909
910 if (!mfi.clean) {
911 output(o, 1, "CONFLICT (content): merge conflict in %s",
912 ren1_dst);
913 clean_merge = 0;
914
915 if (!o->call_depth)
916 update_stages(ren1_dst,
917 ren1->pair->one,
918 ren1->pair->two,
919 ren2->pair->two,
920 1 /* clear */);
921 }
922 update_file(o, mfi.clean, mfi.sha, mfi.mode, ren1_dst);
923 }
924 } else {
925 /* Renamed in 1, maybe changed in 2 */
926 struct string_list_item *item;
927 /* we only use sha1 and mode of these */
928 struct diff_filespec src_other, dst_other;
929 int try_merge, stage = a_renames == renames1 ? 3: 2;
930
931 remove_file(o, 1, ren1_src, o->call_depth || stage == 3);
932
933 hashcpy(src_other.sha1, ren1->src_entry->stages[stage].sha);
934 src_other.mode = ren1->src_entry->stages[stage].mode;
935 hashcpy(dst_other.sha1, ren1->dst_entry->stages[stage].sha);
936 dst_other.mode = ren1->dst_entry->stages[stage].mode;
937
938 try_merge = 0;
939
940 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
941 clean_merge = 0;
942 output(o, 1, "CONFLICT (rename/directory): Rename %s->%s in %s "
943 " directory %s added in %s",
944 ren1_src, ren1_dst, branch1,
945 ren1_dst, branch2);
946 conflict_rename_dir(o, ren1, branch1);
947 } else if (sha_eq(src_other.sha1, null_sha1)) {
948 clean_merge = 0;
949 output(o, 1, "CONFLICT (rename/delete): Rename %s->%s in %s "
950 "and deleted in %s",
951 ren1_src, ren1_dst, branch1,
952 branch2);
953 update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst);
954 if (!o->call_depth)
955 update_stages(ren1_dst, NULL,
956 branch1 == o->branch1 ?
957 ren1->pair->two : NULL,
958 branch1 == o->branch1 ?
959 NULL : ren1->pair->two, 1);
960 } else if (!sha_eq(dst_other.sha1, null_sha1)) {
961 const char *new_path;
962 clean_merge = 0;
963 try_merge = 1;
964 output(o, 1, "CONFLICT (rename/add): Rename %s->%s in %s. "
965 "%s added in %s",
966 ren1_src, ren1_dst, branch1,
967 ren1_dst, branch2);
968 if (o->call_depth) {
969 struct merge_file_info mfi;
970 struct diff_filespec one, a, b;
971
972 one.path = a.path = b.path =
973 (char *)ren1_dst;
974 hashcpy(one.sha1, null_sha1);
975 one.mode = 0;
976 hashcpy(a.sha1, ren1->pair->two->sha1);
977 a.mode = ren1->pair->two->mode;
978 hashcpy(b.sha1, dst_other.sha1);
979 b.mode = dst_other.mode;
980 mfi = merge_file(o, &one, &a, &b,
981 branch1,
982 branch2);
983 output(o, 1, "Adding merged %s", ren1_dst);
984 update_file(o, 0,
985 mfi.sha,
986 mfi.mode,
987 ren1_dst);
988 } else {
989 new_path = unique_path(o, ren1_dst, branch2);
990 output(o, 1, "Adding as %s instead", new_path);
991 update_file(o, 0, dst_other.sha1, dst_other.mode, new_path);
992 }
993 } else if ((item = string_list_lookup(ren1_dst, renames2Dst))) {
994 ren2 = item->util;
995 clean_merge = 0;
996 ren2->processed = 1;
997 output(o, 1, "CONFLICT (rename/rename): "
998 "Rename %s->%s in %s. "
999 "Rename %s->%s in %s",
1000 ren1_src, ren1_dst, branch1,
1001 ren2->pair->one->path, ren2->pair->two->path, branch2);
1002 conflict_rename_rename_2(o, ren1, branch1, ren2, branch2);
1003 } else
1004 try_merge = 1;
1005
1006 if (try_merge) {
1007 struct diff_filespec *one, *a, *b;
1008 struct merge_file_info mfi;
1009 src_other.path = (char *)ren1_src;
1010
1011 one = ren1->pair->one;
1012 if (a_renames == renames1) {
1013 a = ren1->pair->two;
1014 b = &src_other;
1015 } else {
1016 b = ren1->pair->two;
1017 a = &src_other;
1018 }
1019 mfi = merge_file(o, one, a, b,
1020 o->branch1, o->branch2);
1021
1022 if (mfi.clean &&
1023 sha_eq(mfi.sha, ren1->pair->two->sha1) &&
1024 mfi.mode == ren1->pair->two->mode)
1025 /*
1026 * This messaged is part of
1027 * t6022 test. If you change
1028 * it update the test too.
1029 */
1030 output(o, 3, "Skipped %s (merged same as existing)", ren1_dst);
1031 else {
1032 if (mfi.merge || !mfi.clean)
1033 output(o, 1, "Renaming %s => %s", ren1_src, ren1_dst);
1034 if (mfi.merge)
1035 output(o, 2, "Auto-merging %s", ren1_dst);
1036 if (!mfi.clean) {
1037 output(o, 1, "CONFLICT (rename/modify): Merge conflict in %s",
1038 ren1_dst);
1039 clean_merge = 0;
1040
1041 if (!o->call_depth)
1042 update_stages(ren1_dst,
1043 one, a, b, 1);
1044 }
1045 update_file(o, mfi.clean, mfi.sha, mfi.mode, ren1_dst);
1046 }
1047 }
1048 }
1049 }
1050 string_list_clear(&a_by_dst, 0);
1051 string_list_clear(&b_by_dst, 0);
1052
1053 return clean_merge;
1054 }
1055
1056 static unsigned char *stage_sha(const unsigned char *sha, unsigned mode)
1057 {
1058 return (is_null_sha1(sha) || mode == 0) ? NULL: (unsigned char *)sha;
1059 }
1060
1061 static int read_sha1_strbuf(const unsigned char *sha1, struct strbuf *dst)
1062 {
1063 void *buf;
1064 enum object_type type;
1065 unsigned long size;
1066 buf = read_sha1_file(sha1, &type, &size);
1067 if (!buf)
1068 return error("cannot read object %s", sha1_to_hex(sha1));
1069 if (type != OBJ_BLOB) {
1070 free(buf);
1071 return error("object %s is not a blob", sha1_to_hex(sha1));
1072 }
1073 strbuf_attach(dst, buf, size, size + 1);
1074 return 0;
1075 }
1076
1077 static int blob_unchanged(const unsigned char *o_sha,
1078 const unsigned char *a_sha,
1079 int renormalize, const char *path)
1080 {
1081 struct strbuf o = STRBUF_INIT;
1082 struct strbuf a = STRBUF_INIT;
1083 int ret = 0; /* assume changed for safety */
1084
1085 if (sha_eq(o_sha, a_sha))
1086 return 1;
1087 if (!renormalize)
1088 return 0;
1089
1090 assert(o_sha && a_sha);
1091 if (read_sha1_strbuf(o_sha, &o) || read_sha1_strbuf(a_sha, &a))
1092 goto error_return;
1093 /*
1094 * Note: binary | is used so that both renormalizations are
1095 * performed. Comparison can be skipped if both files are
1096 * unchanged since their sha1s have already been compared.
1097 */
1098 if (renormalize_buffer(path, o.buf, o.len, &o) |
1099 renormalize_buffer(path, a.buf, o.len, &a))
1100 ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len));
1101
1102 error_return:
1103 strbuf_release(&o);
1104 strbuf_release(&a);
1105 return ret;
1106 }
1107
1108 /* Per entry merge function */
1109 static int process_entry(struct merge_options *o,
1110 const char *path, struct stage_data *entry)
1111 {
1112 /*
1113 printf("processing entry, clean cache: %s\n", index_only ? "yes": "no");
1114 print_index_entry("\tpath: ", entry);
1115 */
1116 int clean_merge = 1;
1117 int normalize = o->renormalize;
1118 unsigned o_mode = entry->stages[1].mode;
1119 unsigned a_mode = entry->stages[2].mode;
1120 unsigned b_mode = entry->stages[3].mode;
1121 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1122 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1123 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1124
1125 if (o_sha && (!a_sha || !b_sha)) {
1126 /* Case A: Deleted in one */
1127 if ((!a_sha && !b_sha) ||
1128 (!b_sha && blob_unchanged(o_sha, a_sha, normalize, path)) ||
1129 (!a_sha && blob_unchanged(o_sha, b_sha, normalize, path))) {
1130 /* Deleted in both or deleted in one and
1131 * unchanged in the other */
1132 if (a_sha)
1133 output(o, 2, "Removing %s", path);
1134 /* do not touch working file if it did not exist */
1135 remove_file(o, 1, path, !a_sha);
1136 } else {
1137 /* Deleted in one and changed in the other */
1138 clean_merge = 0;
1139 if (!a_sha) {
1140 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1141 "and modified in %s. Version %s of %s left in tree.",
1142 path, o->branch1,
1143 o->branch2, o->branch2, path);
1144 update_file(o, 0, b_sha, b_mode, path);
1145 } else {
1146 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1147 "and modified in %s. Version %s of %s left in tree.",
1148 path, o->branch2,
1149 o->branch1, o->branch1, path);
1150 update_file(o, 0, a_sha, a_mode, path);
1151 }
1152 }
1153
1154 } else if ((!o_sha && a_sha && !b_sha) ||
1155 (!o_sha && !a_sha && b_sha)) {
1156 /* Case B: Added in one. */
1157 const char *add_branch;
1158 const char *other_branch;
1159 unsigned mode;
1160 const unsigned char *sha;
1161 const char *conf;
1162
1163 if (a_sha) {
1164 add_branch = o->branch1;
1165 other_branch = o->branch2;
1166 mode = a_mode;
1167 sha = a_sha;
1168 conf = "file/directory";
1169 } else {
1170 add_branch = o->branch2;
1171 other_branch = o->branch1;
1172 mode = b_mode;
1173 sha = b_sha;
1174 conf = "directory/file";
1175 }
1176 if (string_list_has_string(&o->current_directory_set, path)) {
1177 const char *new_path = unique_path(o, path, add_branch);
1178 clean_merge = 0;
1179 output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. "
1180 "Adding %s as %s",
1181 conf, path, other_branch, path, new_path);
1182 remove_file(o, 0, path, 0);
1183 update_file(o, 0, sha, mode, new_path);
1184 } else {
1185 output(o, 2, "Adding %s", path);
1186 update_file(o, 1, sha, mode, path);
1187 }
1188 } else if (a_sha && b_sha) {
1189 /* Case C: Added in both (check for same permissions) and */
1190 /* case D: Modified in both, but differently. */
1191 const char *reason = "content";
1192 struct merge_file_info mfi;
1193 struct diff_filespec one, a, b;
1194
1195 if (!o_sha) {
1196 reason = "add/add";
1197 o_sha = (unsigned char *)null_sha1;
1198 }
1199 output(o, 2, "Auto-merging %s", path);
1200 one.path = a.path = b.path = (char *)path;
1201 hashcpy(one.sha1, o_sha);
1202 one.mode = o_mode;
1203 hashcpy(a.sha1, a_sha);
1204 a.mode = a_mode;
1205 hashcpy(b.sha1, b_sha);
1206 b.mode = b_mode;
1207
1208 mfi = merge_file(o, &one, &a, &b,
1209 o->branch1, o->branch2);
1210
1211 clean_merge = mfi.clean;
1212 if (!mfi.clean) {
1213 if (S_ISGITLINK(mfi.mode))
1214 reason = "submodule";
1215 output(o, 1, "CONFLICT (%s): Merge conflict in %s",
1216 reason, path);
1217 }
1218 update_file(o, mfi.clean, mfi.sha, mfi.mode, path);
1219 } else if (!o_sha && !a_sha && !b_sha) {
1220 /*
1221 * this entry was deleted altogether. a_mode == 0 means
1222 * we had that path and want to actively remove it.
1223 */
1224 remove_file(o, 1, path, !a_mode);
1225 } else
1226 die("Fatal merge failure, shouldn't happen.");
1227
1228 return clean_merge;
1229 }
1230
1231 struct unpack_trees_error_msgs get_porcelain_error_msgs(void)
1232 {
1233 struct unpack_trees_error_msgs msgs = {
1234 /* would_overwrite */
1235 "Your local changes to '%s' would be overwritten by merge. Aborting.",
1236 /* not_uptodate_file */
1237 "Your local changes to '%s' would be overwritten by merge. Aborting.",
1238 /* not_uptodate_dir */
1239 "Updating '%s' would lose untracked files in it. Aborting.",
1240 /* would_lose_untracked */
1241 "Untracked working tree file '%s' would be %s by merge. Aborting",
1242 /* bind_overlap -- will not happen here */
1243 NULL,
1244 };
1245 if (advice_commit_before_merge) {
1246 msgs.would_overwrite = msgs.not_uptodate_file =
1247 "Your local changes to '%s' would be overwritten by merge. Aborting.\n"
1248 "Please, commit your changes or stash them before you can merge.";
1249 }
1250 return msgs;
1251 }
1252
1253 int merge_trees(struct merge_options *o,
1254 struct tree *head,
1255 struct tree *merge,
1256 struct tree *common,
1257 struct tree **result)
1258 {
1259 int code, clean;
1260
1261 if (o->subtree_shift) {
1262 merge = shift_tree_object(head, merge, o->subtree_shift);
1263 common = shift_tree_object(head, common, o->subtree_shift);
1264 }
1265
1266 if (sha_eq(common->object.sha1, merge->object.sha1)) {
1267 output(o, 0, "Already uptodate!");
1268 *result = head;
1269 return 1;
1270 }
1271
1272 code = git_merge_trees(o->call_depth, common, head, merge);
1273
1274 if (code != 0) {
1275 if (show(o, 4) || o->call_depth)
1276 die("merging of trees %s and %s failed",
1277 sha1_to_hex(head->object.sha1),
1278 sha1_to_hex(merge->object.sha1));
1279 else
1280 exit(128);
1281 }
1282
1283 if (unmerged_cache()) {
1284 struct string_list *entries, *re_head, *re_merge;
1285 int i;
1286 string_list_clear(&o->current_file_set, 1);
1287 string_list_clear(&o->current_directory_set, 1);
1288 get_files_dirs(o, head);
1289 get_files_dirs(o, merge);
1290
1291 entries = get_unmerged();
1292 re_head = get_renames(o, head, common, head, merge, entries);
1293 re_merge = get_renames(o, merge, common, head, merge, entries);
1294 clean = process_renames(o, re_head, re_merge);
1295 for (i = 0; i < entries->nr; i++) {
1296 const char *path = entries->items[i].string;
1297 struct stage_data *e = entries->items[i].util;
1298 if (!e->processed
1299 && !process_entry(o, path, e))
1300 clean = 0;
1301 }
1302
1303 string_list_clear(re_merge, 0);
1304 string_list_clear(re_head, 0);
1305 string_list_clear(entries, 1);
1306
1307 }
1308 else
1309 clean = 1;
1310
1311 if (o->call_depth)
1312 *result = write_tree_from_memory(o);
1313
1314 return clean;
1315 }
1316
1317 static struct commit_list *reverse_commit_list(struct commit_list *list)
1318 {
1319 struct commit_list *next = NULL, *current, *backup;
1320 for (current = list; current; current = backup) {
1321 backup = current->next;
1322 current->next = next;
1323 next = current;
1324 }
1325 return next;
1326 }
1327
1328 /*
1329 * Merge the commits h1 and h2, return the resulting virtual
1330 * commit object and a flag indicating the cleanness of the merge.
1331 */
1332 int merge_recursive(struct merge_options *o,
1333 struct commit *h1,
1334 struct commit *h2,
1335 struct commit_list *ca,
1336 struct commit **result)
1337 {
1338 struct commit_list *iter;
1339 struct commit *merged_common_ancestors;
1340 struct tree *mrtree = mrtree;
1341 int clean;
1342
1343 if (show(o, 4)) {
1344 output(o, 4, "Merging:");
1345 output_commit_title(o, h1);
1346 output_commit_title(o, h2);
1347 }
1348
1349 if (!ca) {
1350 ca = get_merge_bases(h1, h2, 1);
1351 ca = reverse_commit_list(ca);
1352 }
1353
1354 if (show(o, 5)) {
1355 output(o, 5, "found %u common ancestor(s):", commit_list_count(ca));
1356 for (iter = ca; iter; iter = iter->next)
1357 output_commit_title(o, iter->item);
1358 }
1359
1360 merged_common_ancestors = pop_commit(&ca);
1361 if (merged_common_ancestors == NULL) {
1362 /* if there is no common ancestor, make an empty tree */
1363 struct tree *tree = xcalloc(1, sizeof(struct tree));
1364
1365 tree->object.parsed = 1;
1366 tree->object.type = OBJ_TREE;
1367 pretend_sha1_file(NULL, 0, OBJ_TREE, tree->object.sha1);
1368 merged_common_ancestors = make_virtual_commit(tree, "ancestor");
1369 }
1370
1371 for (iter = ca; iter; iter = iter->next) {
1372 const char *saved_b1, *saved_b2;
1373 o->call_depth++;
1374 /*
1375 * When the merge fails, the result contains files
1376 * with conflict markers. The cleanness flag is
1377 * ignored, it was never actually used, as result of
1378 * merge_trees has always overwritten it: the committed
1379 * "conflicts" were already resolved.
1380 */
1381 discard_cache();
1382 saved_b1 = o->branch1;
1383 saved_b2 = o->branch2;
1384 o->branch1 = "Temporary merge branch 1";
1385 o->branch2 = "Temporary merge branch 2";
1386 merge_recursive(o, merged_common_ancestors, iter->item,
1387 NULL, &merged_common_ancestors);
1388 o->branch1 = saved_b1;
1389 o->branch2 = saved_b2;
1390 o->call_depth--;
1391
1392 if (!merged_common_ancestors)
1393 die("merge returned no commit");
1394 }
1395
1396 discard_cache();
1397 if (!o->call_depth)
1398 read_cache();
1399
1400 o->ancestor = "merged common ancestors";
1401 clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
1402 &mrtree);
1403
1404 if (o->call_depth) {
1405 *result = make_virtual_commit(mrtree, "merged tree");
1406 commit_list_insert(h1, &(*result)->parents);
1407 commit_list_insert(h2, &(*result)->parents->next);
1408 }
1409 flush_output(o);
1410 return clean;
1411 }
1412
1413 static struct commit *get_ref(const unsigned char *sha1, const char *name)
1414 {
1415 struct object *object;
1416
1417 object = deref_tag(parse_object(sha1), name, strlen(name));
1418 if (!object)
1419 return NULL;
1420 if (object->type == OBJ_TREE)
1421 return make_virtual_commit((struct tree*)object, name);
1422 if (object->type != OBJ_COMMIT)
1423 return NULL;
1424 if (parse_commit((struct commit *)object))
1425 return NULL;
1426 return (struct commit *)object;
1427 }
1428
1429 int merge_recursive_generic(struct merge_options *o,
1430 const unsigned char *head,
1431 const unsigned char *merge,
1432 int num_base_list,
1433 const unsigned char **base_list,
1434 struct commit **result)
1435 {
1436 int clean, index_fd;
1437 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
1438 struct commit *head_commit = get_ref(head, o->branch1);
1439 struct commit *next_commit = get_ref(merge, o->branch2);
1440 struct commit_list *ca = NULL;
1441
1442 if (base_list) {
1443 int i;
1444 for (i = 0; i < num_base_list; ++i) {
1445 struct commit *base;
1446 if (!(base = get_ref(base_list[i], sha1_to_hex(base_list[i]))))
1447 return error("Could not parse object '%s'",
1448 sha1_to_hex(base_list[i]));
1449 commit_list_insert(base, &ca);
1450 }
1451 }
1452
1453 index_fd = hold_locked_index(lock, 1);
1454 clean = merge_recursive(o, head_commit, next_commit, ca,
1455 result);
1456 if (active_cache_changed &&
1457 (write_cache(index_fd, active_cache, active_nr) ||
1458 commit_locked_index(lock)))
1459 return error("Unable to write index.");
1460
1461 return clean ? 0 : 1;
1462 }
1463
1464 static int merge_recursive_config(const char *var, const char *value, void *cb)
1465 {
1466 struct merge_options *o = cb;
1467 if (!strcasecmp(var, "merge.verbosity")) {
1468 o->verbosity = git_config_int(var, value);
1469 return 0;
1470 }
1471 if (!strcasecmp(var, "diff.renamelimit")) {
1472 o->diff_rename_limit = git_config_int(var, value);
1473 return 0;
1474 }
1475 if (!strcasecmp(var, "merge.renamelimit")) {
1476 o->merge_rename_limit = git_config_int(var, value);
1477 return 0;
1478 }
1479 return git_xmerge_config(var, value, cb);
1480 }
1481
1482 void init_merge_options(struct merge_options *o)
1483 {
1484 memset(o, 0, sizeof(struct merge_options));
1485 o->verbosity = 2;
1486 o->buffer_output = 1;
1487 o->diff_rename_limit = -1;
1488 o->merge_rename_limit = -1;
1489 o->renormalize = 0;
1490 git_config(merge_recursive_config, o);
1491 if (getenv("GIT_MERGE_VERBOSITY"))
1492 o->verbosity =
1493 strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10);
1494 if (o->verbosity >= 5)
1495 o->buffer_output = 0;
1496 strbuf_init(&o->obuf, 0);
1497 memset(&o->current_file_set, 0, sizeof(struct string_list));
1498 o->current_file_set.strdup_strings = 1;
1499 memset(&o->current_directory_set, 0, sizeof(struct string_list));
1500 o->current_directory_set.strdup_strings = 1;
1501 }
1502
1503 int parse_merge_opt(struct merge_options *o, const char *s)
1504 {
1505 if (!s || !*s)
1506 return -1;
1507 if (!strcmp(s, "ours"))
1508 o->recursive_variant = MERGE_RECURSIVE_OURS;
1509 else if (!strcmp(s, "theirs"))
1510 o->recursive_variant = MERGE_RECURSIVE_THEIRS;
1511 else if (!strcmp(s, "subtree"))
1512 o->subtree_shift = "";
1513 else if (!prefixcmp(s, "subtree="))
1514 o->subtree_shift = s + strlen("subtree=");
1515 else if (!strcmp(s, "renormalize"))
1516 o->renormalize = 1;
1517 else if (!strcmp(s, "no-renormalize"))
1518 o->renormalize = 0;
1519 else
1520 return -1;
1521 return 0;
1522 }