16c2dbeab95a0f4099e3de8badf688bb4dee8189
[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 #include "submodule.h"
24
25 static struct tree *shift_tree_object(struct tree *one, struct tree *two,
26 const char *subtree_shift)
27 {
28 unsigned char shifted[20];
29
30 if (!*subtree_shift) {
31 shift_tree(one->object.sha1, two->object.sha1, shifted, 0);
32 } else {
33 shift_tree_by(one->object.sha1, two->object.sha1, shifted,
34 subtree_shift);
35 }
36 if (!hashcmp(two->object.sha1, shifted))
37 return two;
38 return lookup_tree(shifted);
39 }
40
41 /*
42 * A virtual commit has (const char *)commit->util set to the name.
43 */
44
45 static struct commit *make_virtual_commit(struct tree *tree, const char *comment)
46 {
47 struct commit *commit = xcalloc(1, sizeof(struct commit));
48 commit->tree = tree;
49 commit->util = (void*)comment;
50 /* avoid warnings */
51 commit->object.parsed = 1;
52 return commit;
53 }
54
55 /*
56 * Since we use get_tree_entry(), which does not put the read object into
57 * the object pool, we cannot rely on a == b.
58 */
59 static int sha_eq(const unsigned char *a, const unsigned char *b)
60 {
61 if (!a && !b)
62 return 2;
63 return a && b && hashcmp(a, b) == 0;
64 }
65
66 enum rename_type {
67 RENAME_NORMAL = 0,
68 RENAME_DELETE,
69 RENAME_ONE_FILE_TO_TWO
70 };
71
72 struct rename_df_conflict_info {
73 enum rename_type rename_type;
74 struct diff_filepair *pair1;
75 struct diff_filepair *pair2;
76 const char *branch1;
77 const char *branch2;
78 struct stage_data *dst_entry1;
79 struct stage_data *dst_entry2;
80 };
81
82 /*
83 * Since we want to write the index eventually, we cannot reuse the index
84 * for these (temporary) data.
85 */
86 struct stage_data
87 {
88 struct
89 {
90 unsigned mode;
91 unsigned char sha[20];
92 } stages[4];
93 struct rename_df_conflict_info *rename_df_conflict_info;
94 unsigned processed:1;
95 };
96
97 static inline void setup_rename_df_conflict_info(enum rename_type rename_type,
98 struct diff_filepair *pair1,
99 struct diff_filepair *pair2,
100 const char *branch1,
101 const char *branch2,
102 struct stage_data *dst_entry1,
103 struct stage_data *dst_entry2)
104 {
105 struct rename_df_conflict_info *ci = xcalloc(1, sizeof(struct rename_df_conflict_info));
106 ci->rename_type = rename_type;
107 ci->pair1 = pair1;
108 ci->branch1 = branch1;
109 ci->branch2 = branch2;
110
111 ci->dst_entry1 = dst_entry1;
112 dst_entry1->rename_df_conflict_info = ci;
113 dst_entry1->processed = 0;
114
115 assert(!pair2 == !dst_entry2);
116 if (dst_entry2) {
117 ci->dst_entry2 = dst_entry2;
118 ci->pair2 = pair2;
119 dst_entry2->rename_df_conflict_info = ci;
120 dst_entry2->processed = 0;
121 }
122 }
123
124 static int show(struct merge_options *o, int v)
125 {
126 return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5;
127 }
128
129 static void flush_output(struct merge_options *o)
130 {
131 if (o->obuf.len) {
132 fputs(o->obuf.buf, stdout);
133 strbuf_reset(&o->obuf);
134 }
135 }
136
137 __attribute__((format (printf, 3, 4)))
138 static void output(struct merge_options *o, int v, const char *fmt, ...)
139 {
140 int len;
141 va_list ap;
142
143 if (!show(o, v))
144 return;
145
146 strbuf_grow(&o->obuf, o->call_depth * 2 + 2);
147 memset(o->obuf.buf + o->obuf.len, ' ', o->call_depth * 2);
148 strbuf_setlen(&o->obuf, o->obuf.len + o->call_depth * 2);
149
150 va_start(ap, fmt);
151 len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap);
152 va_end(ap);
153
154 if (len < 0)
155 len = 0;
156 if (len >= strbuf_avail(&o->obuf)) {
157 strbuf_grow(&o->obuf, len + 2);
158 va_start(ap, fmt);
159 len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap);
160 va_end(ap);
161 if (len >= strbuf_avail(&o->obuf)) {
162 die("this should not happen, your snprintf is broken");
163 }
164 }
165 strbuf_setlen(&o->obuf, o->obuf.len + len);
166 strbuf_add(&o->obuf, "\n", 1);
167 if (!o->buffer_output)
168 flush_output(o);
169 }
170
171 static void output_commit_title(struct merge_options *o, struct commit *commit)
172 {
173 int i;
174 flush_output(o);
175 for (i = o->call_depth; i--;)
176 fputs(" ", stdout);
177 if (commit->util)
178 printf("virtual %s\n", (char *)commit->util);
179 else {
180 printf("%s ", find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV));
181 if (parse_commit(commit) != 0)
182 printf("(bad commit)\n");
183 else {
184 const char *title;
185 int len = find_commit_subject(commit->buffer, &title);
186 if (len)
187 printf("%.*s\n", len, title);
188 }
189 }
190 }
191
192 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
193 const char *path, int stage, int refresh, int options)
194 {
195 struct cache_entry *ce;
196 ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage, refresh);
197 if (!ce)
198 return error("addinfo_cache failed for path '%s'", path);
199 return add_cache_entry(ce, options);
200 }
201
202 static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree)
203 {
204 parse_tree(tree);
205 init_tree_desc(desc, tree->buffer, tree->size);
206 }
207
208 static int git_merge_trees(int index_only,
209 struct tree *common,
210 struct tree *head,
211 struct tree *merge)
212 {
213 int rc;
214 struct tree_desc t[3];
215 struct unpack_trees_options opts;
216
217 memset(&opts, 0, sizeof(opts));
218 if (index_only)
219 opts.index_only = 1;
220 else
221 opts.update = 1;
222 opts.merge = 1;
223 opts.head_idx = 2;
224 opts.fn = threeway_merge;
225 opts.src_index = &the_index;
226 opts.dst_index = &the_index;
227 setup_unpack_trees_porcelain(&opts, "merge");
228
229 init_tree_desc_from_tree(t+0, common);
230 init_tree_desc_from_tree(t+1, head);
231 init_tree_desc_from_tree(t+2, merge);
232
233 rc = unpack_trees(3, t, &opts);
234 cache_tree_free(&active_cache_tree);
235 return rc;
236 }
237
238 struct tree *write_tree_from_memory(struct merge_options *o)
239 {
240 struct tree *result = NULL;
241
242 if (unmerged_cache()) {
243 int i;
244 fprintf(stderr, "BUG: There are unmerged index entries:\n");
245 for (i = 0; i < active_nr; i++) {
246 struct cache_entry *ce = active_cache[i];
247 if (ce_stage(ce))
248 fprintf(stderr, "BUG: %d %.*s", ce_stage(ce),
249 (int)ce_namelen(ce), ce->name);
250 }
251 die("Bug in merge-recursive.c");
252 }
253
254 if (!active_cache_tree)
255 active_cache_tree = cache_tree();
256
257 if (!cache_tree_fully_valid(active_cache_tree) &&
258 cache_tree_update(active_cache_tree,
259 active_cache, active_nr, 0, 0) < 0)
260 die("error building trees");
261
262 result = lookup_tree(active_cache_tree->sha1);
263
264 return result;
265 }
266
267 static int save_files_dirs(const unsigned char *sha1,
268 const char *base, int baselen, const char *path,
269 unsigned int mode, int stage, void *context)
270 {
271 int len = strlen(path);
272 char *newpath = xmalloc(baselen + len + 1);
273 struct merge_options *o = context;
274
275 memcpy(newpath, base, baselen);
276 memcpy(newpath + baselen, path, len);
277 newpath[baselen + len] = '\0';
278
279 if (S_ISDIR(mode))
280 string_list_insert(&o->current_directory_set, newpath);
281 else
282 string_list_insert(&o->current_file_set, newpath);
283 free(newpath);
284
285 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
286 }
287
288 static int get_files_dirs(struct merge_options *o, struct tree *tree)
289 {
290 int n;
291 if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs, o))
292 return 0;
293 n = o->current_file_set.nr + o->current_directory_set.nr;
294 return n;
295 }
296
297 /*
298 * Returns an index_entry instance which doesn't have to correspond to
299 * a real cache entry in Git's index.
300 */
301 static struct stage_data *insert_stage_data(const char *path,
302 struct tree *o, struct tree *a, struct tree *b,
303 struct string_list *entries)
304 {
305 struct string_list_item *item;
306 struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
307 get_tree_entry(o->object.sha1, path,
308 e->stages[1].sha, &e->stages[1].mode);
309 get_tree_entry(a->object.sha1, path,
310 e->stages[2].sha, &e->stages[2].mode);
311 get_tree_entry(b->object.sha1, path,
312 e->stages[3].sha, &e->stages[3].mode);
313 item = string_list_insert(entries, path);
314 item->util = e;
315 return e;
316 }
317
318 /*
319 * Create a dictionary mapping file names to stage_data objects. The
320 * dictionary contains one entry for every path with a non-zero stage entry.
321 */
322 static struct string_list *get_unmerged(void)
323 {
324 struct string_list *unmerged = xcalloc(1, sizeof(struct string_list));
325 int i;
326
327 unmerged->strdup_strings = 1;
328
329 for (i = 0; i < active_nr; i++) {
330 struct string_list_item *item;
331 struct stage_data *e;
332 struct cache_entry *ce = active_cache[i];
333 if (!ce_stage(ce))
334 continue;
335
336 item = string_list_lookup(unmerged, ce->name);
337 if (!item) {
338 item = string_list_insert(unmerged, ce->name);
339 item->util = xcalloc(1, sizeof(struct stage_data));
340 }
341 e = item->util;
342 e->stages[ce_stage(ce)].mode = ce->ce_mode;
343 hashcpy(e->stages[ce_stage(ce)].sha, ce->sha1);
344 }
345
346 return unmerged;
347 }
348
349 static void make_room_for_directories_of_df_conflicts(struct merge_options *o,
350 struct string_list *entries)
351 {
352 /* If there are D/F conflicts, and the paths currently exist
353 * in the working copy as a file, we want to remove them to
354 * make room for the corresponding directory. Such paths will
355 * later be processed in process_df_entry() at the end. If
356 * the corresponding directory ends up being removed by the
357 * merge, then the file will be reinstated at that time;
358 * otherwise, if the file is not supposed to be removed by the
359 * merge, the contents of the file will be placed in another
360 * unique filename.
361 *
362 * NOTE: This function relies on the fact that entries for a
363 * D/F conflict will appear adjacent in the index, with the
364 * entries for the file appearing before entries for paths
365 * below the corresponding directory.
366 */
367 const char *last_file = NULL;
368 int last_len = 0;
369 struct stage_data *last_e;
370 int i;
371
372 for (i = 0; i < entries->nr; i++) {
373 const char *path = entries->items[i].string;
374 int len = strlen(path);
375 struct stage_data *e = entries->items[i].util;
376
377 /*
378 * Check if last_file & path correspond to a D/F conflict;
379 * i.e. whether path is last_file+'/'+<something>.
380 * If so, remove last_file to make room for path and friends.
381 */
382 if (last_file &&
383 len > last_len &&
384 memcmp(path, last_file, last_len) == 0 &&
385 path[last_len] == '/') {
386 output(o, 3, "Removing %s to make room for subdirectory; may re-add later.", last_file);
387 unlink(last_file);
388 }
389
390 /*
391 * Determine whether path could exist as a file in the
392 * working directory as a possible D/F conflict. This
393 * will only occur when it exists in stage 2 as a
394 * file.
395 */
396 if (S_ISREG(e->stages[2].mode) || S_ISLNK(e->stages[2].mode)) {
397 last_file = path;
398 last_len = len;
399 last_e = e;
400 } else {
401 last_file = NULL;
402 }
403 }
404 }
405
406 struct rename
407 {
408 struct diff_filepair *pair;
409 struct stage_data *src_entry;
410 struct stage_data *dst_entry;
411 unsigned processed:1;
412 };
413
414 /*
415 * Get information of all renames which occurred between 'o_tree' and
416 * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
417 * 'b_tree') to be able to associate the correct cache entries with
418 * the rename information. 'tree' is always equal to either a_tree or b_tree.
419 */
420 static struct string_list *get_renames(struct merge_options *o,
421 struct tree *tree,
422 struct tree *o_tree,
423 struct tree *a_tree,
424 struct tree *b_tree,
425 struct string_list *entries)
426 {
427 int i;
428 struct string_list *renames;
429 struct diff_options opts;
430
431 renames = xcalloc(1, sizeof(struct string_list));
432 diff_setup(&opts);
433 DIFF_OPT_SET(&opts, RECURSIVE);
434 opts.detect_rename = DIFF_DETECT_RENAME;
435 opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
436 o->diff_rename_limit >= 0 ? o->diff_rename_limit :
437 500;
438 opts.rename_score = o->rename_score;
439 opts.warn_on_too_large_rename = 1;
440 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
441 if (diff_setup_done(&opts) < 0)
442 die("diff setup failed");
443 diff_tree_sha1(o_tree->object.sha1, tree->object.sha1, "", &opts);
444 diffcore_std(&opts);
445 for (i = 0; i < diff_queued_diff.nr; ++i) {
446 struct string_list_item *item;
447 struct rename *re;
448 struct diff_filepair *pair = diff_queued_diff.queue[i];
449 if (pair->status != 'R') {
450 diff_free_filepair(pair);
451 continue;
452 }
453 re = xmalloc(sizeof(*re));
454 re->processed = 0;
455 re->pair = pair;
456 item = string_list_lookup(entries, re->pair->one->path);
457 if (!item)
458 re->src_entry = insert_stage_data(re->pair->one->path,
459 o_tree, a_tree, b_tree, entries);
460 else
461 re->src_entry = item->util;
462
463 item = string_list_lookup(entries, re->pair->two->path);
464 if (!item)
465 re->dst_entry = insert_stage_data(re->pair->two->path,
466 o_tree, a_tree, b_tree, entries);
467 else
468 re->dst_entry = item->util;
469 item = string_list_insert(renames, pair->one->path);
470 item->util = re;
471 }
472 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
473 diff_queued_diff.nr = 0;
474 diff_flush(&opts);
475 return renames;
476 }
477
478 static int update_stages_options(const char *path, struct diff_filespec *o,
479 struct diff_filespec *a, struct diff_filespec *b,
480 int clear, int options)
481 {
482 if (clear)
483 if (remove_file_from_cache(path))
484 return -1;
485 if (o)
486 if (add_cacheinfo(o->mode, o->sha1, path, 1, 0, options))
487 return -1;
488 if (a)
489 if (add_cacheinfo(a->mode, a->sha1, path, 2, 0, options))
490 return -1;
491 if (b)
492 if (add_cacheinfo(b->mode, b->sha1, path, 3, 0, options))
493 return -1;
494 return 0;
495 }
496
497 static int update_stages(const char *path, struct diff_filespec *o,
498 struct diff_filespec *a, struct diff_filespec *b,
499 int clear)
500 {
501 int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE;
502 return update_stages_options(path, o, a, b, clear, options);
503 }
504
505 static int update_stages_and_entry(const char *path,
506 struct stage_data *entry,
507 struct diff_filespec *o,
508 struct diff_filespec *a,
509 struct diff_filespec *b,
510 int clear)
511 {
512 int options;
513
514 entry->processed = 0;
515 entry->stages[1].mode = o->mode;
516 entry->stages[2].mode = a->mode;
517 entry->stages[3].mode = b->mode;
518 hashcpy(entry->stages[1].sha, o->sha1);
519 hashcpy(entry->stages[2].sha, a->sha1);
520 hashcpy(entry->stages[3].sha, b->sha1);
521 options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_SKIP_DFCHECK;
522 return update_stages_options(path, o, a, b, clear, options);
523 }
524
525 static int remove_file(struct merge_options *o, int clean,
526 const char *path, int no_wd)
527 {
528 int update_cache = o->call_depth || clean;
529 int update_working_directory = !o->call_depth && !no_wd;
530
531 if (update_cache) {
532 if (remove_file_from_cache(path))
533 return -1;
534 }
535 if (update_working_directory) {
536 if (remove_path(path))
537 return -1;
538 }
539 return 0;
540 }
541
542 static char *unique_path(struct merge_options *o, const char *path, const char *branch)
543 {
544 char *newpath = xmalloc(strlen(path) + 1 + strlen(branch) + 8 + 1);
545 int suffix = 0;
546 struct stat st;
547 char *p = newpath + strlen(path);
548 strcpy(newpath, path);
549 *(p++) = '~';
550 strcpy(p, branch);
551 for (; *p; ++p)
552 if ('/' == *p)
553 *p = '_';
554 while (string_list_has_string(&o->current_file_set, newpath) ||
555 string_list_has_string(&o->current_directory_set, newpath) ||
556 lstat(newpath, &st) == 0)
557 sprintf(p, "_%d", suffix++);
558
559 string_list_insert(&o->current_file_set, newpath);
560 return newpath;
561 }
562
563 static void flush_buffer(int fd, const char *buf, unsigned long size)
564 {
565 while (size > 0) {
566 long ret = write_in_full(fd, buf, size);
567 if (ret < 0) {
568 /* Ignore epipe */
569 if (errno == EPIPE)
570 break;
571 die_errno("merge-recursive");
572 } else if (!ret) {
573 die("merge-recursive: disk full?");
574 }
575 size -= ret;
576 buf += ret;
577 }
578 }
579
580 static int would_lose_untracked(const char *path)
581 {
582 int pos = cache_name_pos(path, strlen(path));
583
584 if (pos < 0)
585 pos = -1 - pos;
586 while (pos < active_nr &&
587 !strcmp(path, active_cache[pos]->name)) {
588 /*
589 * If stage #0, it is definitely tracked.
590 * If it has stage #2 then it was tracked
591 * before this merge started. All other
592 * cases the path was not tracked.
593 */
594 switch (ce_stage(active_cache[pos])) {
595 case 0:
596 case 2:
597 return 0;
598 }
599 pos++;
600 }
601 return file_exists(path);
602 }
603
604 static int make_room_for_path(const char *path)
605 {
606 int status;
607 const char *msg = "failed to create path '%s'%s";
608
609 status = safe_create_leading_directories_const(path);
610 if (status) {
611 if (status == -3) {
612 /* something else exists */
613 error(msg, path, ": perhaps a D/F conflict?");
614 return -1;
615 }
616 die(msg, path, "");
617 }
618
619 /*
620 * Do not unlink a file in the work tree if we are not
621 * tracking it.
622 */
623 if (would_lose_untracked(path))
624 return error("refusing to lose untracked file at '%s'",
625 path);
626
627 /* Successful unlink is good.. */
628 if (!unlink(path))
629 return 0;
630 /* .. and so is no existing file */
631 if (errno == ENOENT)
632 return 0;
633 /* .. but not some other error (who really cares what?) */
634 return error(msg, path, ": perhaps a D/F conflict?");
635 }
636
637 static void update_file_flags(struct merge_options *o,
638 const unsigned char *sha,
639 unsigned mode,
640 const char *path,
641 int update_cache,
642 int update_wd)
643 {
644 if (o->call_depth)
645 update_wd = 0;
646
647 if (update_wd) {
648 enum object_type type;
649 void *buf;
650 unsigned long size;
651
652 if (S_ISGITLINK(mode)) {
653 /*
654 * We may later decide to recursively descend into
655 * the submodule directory and update its index
656 * and/or work tree, but we do not do that now.
657 */
658 update_wd = 0;
659 goto update_index;
660 }
661
662 buf = read_sha1_file(sha, &type, &size);
663 if (!buf)
664 die("cannot read object %s '%s'", sha1_to_hex(sha), path);
665 if (type != OBJ_BLOB)
666 die("blob expected for %s '%s'", sha1_to_hex(sha), path);
667 if (S_ISREG(mode)) {
668 struct strbuf strbuf = STRBUF_INIT;
669 if (convert_to_working_tree(path, buf, size, &strbuf)) {
670 free(buf);
671 size = strbuf.len;
672 buf = strbuf_detach(&strbuf, NULL);
673 }
674 }
675
676 if (make_room_for_path(path) < 0) {
677 update_wd = 0;
678 free(buf);
679 goto update_index;
680 }
681 if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
682 int fd;
683 if (mode & 0100)
684 mode = 0777;
685 else
686 mode = 0666;
687 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
688 if (fd < 0)
689 die_errno("failed to open '%s'", path);
690 flush_buffer(fd, buf, size);
691 close(fd);
692 } else if (S_ISLNK(mode)) {
693 char *lnk = xmemdupz(buf, size);
694 safe_create_leading_directories_const(path);
695 unlink(path);
696 if (symlink(lnk, path))
697 die_errno("failed to symlink '%s'", path);
698 free(lnk);
699 } else
700 die("do not know what to do with %06o %s '%s'",
701 mode, sha1_to_hex(sha), path);
702 free(buf);
703 }
704 update_index:
705 if (update_cache)
706 add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
707 }
708
709 static void update_file(struct merge_options *o,
710 int clean,
711 const unsigned char *sha,
712 unsigned mode,
713 const char *path)
714 {
715 update_file_flags(o, sha, mode, path, o->call_depth || clean, !o->call_depth);
716 }
717
718 /* Low level file merging, update and removal */
719
720 struct merge_file_info
721 {
722 unsigned char sha[20];
723 unsigned mode;
724 unsigned clean:1,
725 merge:1;
726 };
727
728 static int merge_3way(struct merge_options *o,
729 mmbuffer_t *result_buf,
730 struct diff_filespec *one,
731 struct diff_filespec *a,
732 struct diff_filespec *b,
733 const char *branch1,
734 const char *branch2)
735 {
736 mmfile_t orig, src1, src2;
737 struct ll_merge_options ll_opts = {0};
738 char *base_name, *name1, *name2;
739 int merge_status;
740
741 ll_opts.renormalize = o->renormalize;
742 ll_opts.xdl_opts = o->xdl_opts;
743
744 if (o->call_depth) {
745 ll_opts.virtual_ancestor = 1;
746 ll_opts.variant = 0;
747 } else {
748 switch (o->recursive_variant) {
749 case MERGE_RECURSIVE_OURS:
750 ll_opts.variant = XDL_MERGE_FAVOR_OURS;
751 break;
752 case MERGE_RECURSIVE_THEIRS:
753 ll_opts.variant = XDL_MERGE_FAVOR_THEIRS;
754 break;
755 default:
756 ll_opts.variant = 0;
757 break;
758 }
759 }
760
761 if (strcmp(a->path, b->path) ||
762 (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) {
763 base_name = o->ancestor == NULL ? NULL :
764 xstrdup(mkpath("%s:%s", o->ancestor, one->path));
765 name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
766 name2 = xstrdup(mkpath("%s:%s", branch2, b->path));
767 } else {
768 base_name = o->ancestor == NULL ? NULL :
769 xstrdup(mkpath("%s", o->ancestor));
770 name1 = xstrdup(mkpath("%s", branch1));
771 name2 = xstrdup(mkpath("%s", branch2));
772 }
773
774 read_mmblob(&orig, one->sha1);
775 read_mmblob(&src1, a->sha1);
776 read_mmblob(&src2, b->sha1);
777
778 merge_status = ll_merge(result_buf, a->path, &orig, base_name,
779 &src1, name1, &src2, name2, &ll_opts);
780
781 free(name1);
782 free(name2);
783 free(orig.ptr);
784 free(src1.ptr);
785 free(src2.ptr);
786 return merge_status;
787 }
788
789 static struct merge_file_info merge_file(struct merge_options *o,
790 struct diff_filespec *one,
791 struct diff_filespec *a,
792 struct diff_filespec *b,
793 const char *branch1,
794 const char *branch2)
795 {
796 struct merge_file_info result;
797 result.merge = 0;
798 result.clean = 1;
799
800 if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) {
801 result.clean = 0;
802 if (S_ISREG(a->mode)) {
803 result.mode = a->mode;
804 hashcpy(result.sha, a->sha1);
805 } else {
806 result.mode = b->mode;
807 hashcpy(result.sha, b->sha1);
808 }
809 } else {
810 if (!sha_eq(a->sha1, one->sha1) && !sha_eq(b->sha1, one->sha1))
811 result.merge = 1;
812
813 /*
814 * Merge modes
815 */
816 if (a->mode == b->mode || a->mode == one->mode)
817 result.mode = b->mode;
818 else {
819 result.mode = a->mode;
820 if (b->mode != one->mode) {
821 result.clean = 0;
822 result.merge = 1;
823 }
824 }
825
826 if (sha_eq(a->sha1, b->sha1) || sha_eq(a->sha1, one->sha1))
827 hashcpy(result.sha, b->sha1);
828 else if (sha_eq(b->sha1, one->sha1))
829 hashcpy(result.sha, a->sha1);
830 else if (S_ISREG(a->mode)) {
831 mmbuffer_t result_buf;
832 int merge_status;
833
834 merge_status = merge_3way(o, &result_buf, one, a, b,
835 branch1, branch2);
836
837 if ((merge_status < 0) || !result_buf.ptr)
838 die("Failed to execute internal merge");
839
840 if (write_sha1_file(result_buf.ptr, result_buf.size,
841 blob_type, result.sha))
842 die("Unable to add %s to database",
843 a->path);
844
845 free(result_buf.ptr);
846 result.clean = (merge_status == 0);
847 } else if (S_ISGITLINK(a->mode)) {
848 result.clean = merge_submodule(result.sha, one->path, one->sha1,
849 a->sha1, b->sha1);
850 } else if (S_ISLNK(a->mode)) {
851 hashcpy(result.sha, a->sha1);
852
853 if (!sha_eq(a->sha1, b->sha1))
854 result.clean = 0;
855 } else {
856 die("unsupported object type in the tree");
857 }
858 }
859
860 return result;
861 }
862
863 static void conflict_rename_delete(struct merge_options *o,
864 struct diff_filepair *pair,
865 const char *rename_branch,
866 const char *other_branch)
867 {
868 char *dest_name = pair->two->path;
869 int df_conflict = 0;
870 struct stat st;
871
872 output(o, 1, "CONFLICT (rename/delete): Rename %s->%s in %s "
873 "and deleted in %s",
874 pair->one->path, pair->two->path, rename_branch,
875 other_branch);
876 if (!o->call_depth)
877 update_stages(dest_name, NULL,
878 rename_branch == o->branch1 ? pair->two : NULL,
879 rename_branch == o->branch1 ? NULL : pair->two,
880 1);
881 if (lstat(dest_name, &st) == 0 && S_ISDIR(st.st_mode)) {
882 dest_name = unique_path(o, dest_name, rename_branch);
883 df_conflict = 1;
884 }
885 update_file(o, 0, pair->two->sha1, pair->two->mode, dest_name);
886 if (df_conflict)
887 free(dest_name);
888 }
889
890 static void conflict_rename_rename_1to2(struct merge_options *o,
891 struct diff_filepair *pair1,
892 const char *branch1,
893 struct diff_filepair *pair2,
894 const char *branch2)
895 {
896 /* One file was renamed in both branches, but to different names. */
897 char *del[2];
898 int delp = 0;
899 const char *ren1_dst = pair1->two->path;
900 const char *ren2_dst = pair2->two->path;
901 const char *dst_name1 = ren1_dst;
902 const char *dst_name2 = ren2_dst;
903 struct stat st;
904 if (lstat(ren1_dst, &st) == 0 && S_ISDIR(st.st_mode)) {
905 dst_name1 = del[delp++] = unique_path(o, ren1_dst, branch1);
906 output(o, 1, "%s is a directory in %s adding as %s instead",
907 ren1_dst, branch2, dst_name1);
908 }
909 if (lstat(ren2_dst, &st) == 0 && S_ISDIR(st.st_mode)) {
910 dst_name2 = del[delp++] = unique_path(o, ren2_dst, branch2);
911 output(o, 1, "%s is a directory in %s adding as %s instead",
912 ren2_dst, branch1, dst_name2);
913 }
914 if (o->call_depth) {
915 remove_file_from_cache(dst_name1);
916 remove_file_from_cache(dst_name2);
917 /*
918 * Uncomment to leave the conflicting names in the resulting tree
919 *
920 * update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1);
921 * update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2);
922 */
923 } else {
924 update_stages(ren1_dst, NULL, pair1->two, NULL, 1);
925 update_stages(ren2_dst, NULL, NULL, pair2->two, 1);
926
927 update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1);
928 update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2);
929 }
930 while (delp--)
931 free(del[delp]);
932 }
933
934 static void conflict_rename_rename_2to1(struct merge_options *o,
935 struct rename *ren1,
936 const char *branch1,
937 struct rename *ren2,
938 const char *branch2)
939 {
940 /* Two files were renamed to the same thing. */
941 char *new_path1 = unique_path(o, ren1->pair->two->path, branch1);
942 char *new_path2 = unique_path(o, ren2->pair->two->path, branch2);
943 output(o, 1, "Renaming %s to %s and %s to %s instead",
944 ren1->pair->one->path, new_path1,
945 ren2->pair->one->path, new_path2);
946 remove_file(o, 0, ren1->pair->two->path, 0);
947 update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path1);
948 update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, new_path2);
949 free(new_path2);
950 free(new_path1);
951 }
952
953 static int process_renames(struct merge_options *o,
954 struct string_list *a_renames,
955 struct string_list *b_renames)
956 {
957 int clean_merge = 1, i, j;
958 struct string_list a_by_dst = STRING_LIST_INIT_NODUP;
959 struct string_list b_by_dst = STRING_LIST_INIT_NODUP;
960 const struct rename *sre;
961
962 for (i = 0; i < a_renames->nr; i++) {
963 sre = a_renames->items[i].util;
964 string_list_insert(&a_by_dst, sre->pair->two->path)->util
965 = sre->dst_entry;
966 }
967 for (i = 0; i < b_renames->nr; i++) {
968 sre = b_renames->items[i].util;
969 string_list_insert(&b_by_dst, sre->pair->two->path)->util
970 = sre->dst_entry;
971 }
972
973 for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
974 char *src;
975 struct string_list *renames1, *renames2Dst;
976 struct rename *ren1 = NULL, *ren2 = NULL;
977 const char *branch1, *branch2;
978 const char *ren1_src, *ren1_dst;
979
980 if (i >= a_renames->nr) {
981 ren2 = b_renames->items[j++].util;
982 } else if (j >= b_renames->nr) {
983 ren1 = a_renames->items[i++].util;
984 } else {
985 int compare = strcmp(a_renames->items[i].string,
986 b_renames->items[j].string);
987 if (compare <= 0)
988 ren1 = a_renames->items[i++].util;
989 if (compare >= 0)
990 ren2 = b_renames->items[j++].util;
991 }
992
993 /* TODO: refactor, so that 1/2 are not needed */
994 if (ren1) {
995 renames1 = a_renames;
996 renames2Dst = &b_by_dst;
997 branch1 = o->branch1;
998 branch2 = o->branch2;
999 } else {
1000 struct rename *tmp;
1001 renames1 = b_renames;
1002 renames2Dst = &a_by_dst;
1003 branch1 = o->branch2;
1004 branch2 = o->branch1;
1005 tmp = ren2;
1006 ren2 = ren1;
1007 ren1 = tmp;
1008 }
1009 src = ren1->pair->one->path;
1010
1011 ren1->dst_entry->processed = 1;
1012 ren1->src_entry->processed = 1;
1013
1014 if (ren1->processed)
1015 continue;
1016 ren1->processed = 1;
1017
1018 ren1_src = ren1->pair->one->path;
1019 ren1_dst = ren1->pair->two->path;
1020
1021 if (ren2) {
1022 const char *ren2_src = ren2->pair->one->path;
1023 const char *ren2_dst = ren2->pair->two->path;
1024 /* Renamed in 1 and renamed in 2 */
1025 if (strcmp(ren1_src, ren2_src) != 0)
1026 die("ren1.src != ren2.src");
1027 ren2->dst_entry->processed = 1;
1028 ren2->processed = 1;
1029 if (strcmp(ren1_dst, ren2_dst) != 0) {
1030 setup_rename_df_conflict_info(RENAME_ONE_FILE_TO_TWO,
1031 ren1->pair,
1032 ren2->pair,
1033 branch1,
1034 branch2,
1035 ren1->dst_entry,
1036 ren2->dst_entry);
1037 } else {
1038 remove_file(o, 1, ren1_src, 1);
1039 update_stages_and_entry(ren1_dst,
1040 ren1->dst_entry,
1041 ren1->pair->one,
1042 ren1->pair->two,
1043 ren2->pair->two,
1044 1 /* clear */);
1045 }
1046 } else {
1047 /* Renamed in 1, maybe changed in 2 */
1048 struct string_list_item *item;
1049 /* we only use sha1 and mode of these */
1050 struct diff_filespec src_other, dst_other;
1051 int try_merge;
1052
1053 /*
1054 * unpack_trees loads entries from common-commit
1055 * into stage 1, from head-commit into stage 2, and
1056 * from merge-commit into stage 3. We keep track
1057 * of which side corresponds to the rename.
1058 */
1059 int renamed_stage = a_renames == renames1 ? 2 : 3;
1060 int other_stage = a_renames == renames1 ? 3 : 2;
1061
1062 remove_file(o, 1, ren1_src, o->call_depth || renamed_stage == 2);
1063
1064 hashcpy(src_other.sha1, ren1->src_entry->stages[other_stage].sha);
1065 src_other.mode = ren1->src_entry->stages[other_stage].mode;
1066 hashcpy(dst_other.sha1, ren1->dst_entry->stages[other_stage].sha);
1067 dst_other.mode = ren1->dst_entry->stages[other_stage].mode;
1068 try_merge = 0;
1069
1070 if (sha_eq(src_other.sha1, null_sha1)) {
1071 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
1072 ren1->dst_entry->processed = 0;
1073 setup_rename_df_conflict_info(RENAME_DELETE,
1074 ren1->pair,
1075 NULL,
1076 branch1,
1077 branch2,
1078 ren1->dst_entry,
1079 NULL);
1080 } else {
1081 clean_merge = 0;
1082 conflict_rename_delete(o, ren1->pair, branch1, branch2);
1083 }
1084 } else if ((dst_other.mode == ren1->pair->two->mode) &&
1085 sha_eq(dst_other.sha1, ren1->pair->two->sha1)) {
1086 /* Added file on the other side
1087 identical to the file being
1088 renamed: clean merge */
1089 update_file(o, 1, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst);
1090 } else if (!sha_eq(dst_other.sha1, null_sha1)) {
1091 const char *new_path;
1092 clean_merge = 0;
1093 try_merge = 1;
1094 output(o, 1, "CONFLICT (rename/add): Rename %s->%s in %s. "
1095 "%s added in %s",
1096 ren1_src, ren1_dst, branch1,
1097 ren1_dst, branch2);
1098 if (o->call_depth) {
1099 struct merge_file_info mfi;
1100 struct diff_filespec one, a, b;
1101
1102 one.path = a.path = b.path =
1103 (char *)ren1_dst;
1104 hashcpy(one.sha1, null_sha1);
1105 one.mode = 0;
1106 hashcpy(a.sha1, ren1->pair->two->sha1);
1107 a.mode = ren1->pair->two->mode;
1108 hashcpy(b.sha1, dst_other.sha1);
1109 b.mode = dst_other.mode;
1110 mfi = merge_file(o, &one, &a, &b,
1111 branch1,
1112 branch2);
1113 output(o, 1, "Adding merged %s", ren1_dst);
1114 update_file(o, 0,
1115 mfi.sha,
1116 mfi.mode,
1117 ren1_dst);
1118 try_merge = 0;
1119 } else {
1120 new_path = unique_path(o, ren1_dst, branch2);
1121 output(o, 1, "Adding as %s instead", new_path);
1122 update_file(o, 0, dst_other.sha1, dst_other.mode, new_path);
1123 }
1124 } else if ((item = string_list_lookup(renames2Dst, ren1_dst))) {
1125 ren2 = item->util;
1126 clean_merge = 0;
1127 ren2->processed = 1;
1128 output(o, 1, "CONFLICT (rename/rename): "
1129 "Rename %s->%s in %s. "
1130 "Rename %s->%s in %s",
1131 ren1_src, ren1_dst, branch1,
1132 ren2->pair->one->path, ren2->pair->two->path, branch2);
1133 conflict_rename_rename_2to1(o, ren1, branch1, ren2, branch2);
1134 } else
1135 try_merge = 1;
1136
1137 if (try_merge) {
1138 struct diff_filespec *one, *a, *b;
1139 src_other.path = (char *)ren1_src;
1140
1141 one = ren1->pair->one;
1142 if (a_renames == renames1) {
1143 a = ren1->pair->two;
1144 b = &src_other;
1145 } else {
1146 b = ren1->pair->two;
1147 a = &src_other;
1148 }
1149 update_stages_and_entry(ren1_dst, ren1->dst_entry, one, a, b, 1);
1150 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
1151 setup_rename_df_conflict_info(RENAME_NORMAL,
1152 ren1->pair,
1153 NULL,
1154 branch1,
1155 NULL,
1156 ren1->dst_entry,
1157 NULL);
1158 }
1159 }
1160 }
1161 }
1162 string_list_clear(&a_by_dst, 0);
1163 string_list_clear(&b_by_dst, 0);
1164
1165 return clean_merge;
1166 }
1167
1168 static unsigned char *stage_sha(const unsigned char *sha, unsigned mode)
1169 {
1170 return (is_null_sha1(sha) || mode == 0) ? NULL: (unsigned char *)sha;
1171 }
1172
1173 static int read_sha1_strbuf(const unsigned char *sha1, struct strbuf *dst)
1174 {
1175 void *buf;
1176 enum object_type type;
1177 unsigned long size;
1178 buf = read_sha1_file(sha1, &type, &size);
1179 if (!buf)
1180 return error("cannot read object %s", sha1_to_hex(sha1));
1181 if (type != OBJ_BLOB) {
1182 free(buf);
1183 return error("object %s is not a blob", sha1_to_hex(sha1));
1184 }
1185 strbuf_attach(dst, buf, size, size + 1);
1186 return 0;
1187 }
1188
1189 static int blob_unchanged(const unsigned char *o_sha,
1190 const unsigned char *a_sha,
1191 int renormalize, const char *path)
1192 {
1193 struct strbuf o = STRBUF_INIT;
1194 struct strbuf a = STRBUF_INIT;
1195 int ret = 0; /* assume changed for safety */
1196
1197 if (sha_eq(o_sha, a_sha))
1198 return 1;
1199 if (!renormalize)
1200 return 0;
1201
1202 assert(o_sha && a_sha);
1203 if (read_sha1_strbuf(o_sha, &o) || read_sha1_strbuf(a_sha, &a))
1204 goto error_return;
1205 /*
1206 * Note: binary | is used so that both renormalizations are
1207 * performed. Comparison can be skipped if both files are
1208 * unchanged since their sha1s have already been compared.
1209 */
1210 if (renormalize_buffer(path, o.buf, o.len, &o) |
1211 renormalize_buffer(path, a.buf, o.len, &a))
1212 ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len));
1213
1214 error_return:
1215 strbuf_release(&o);
1216 strbuf_release(&a);
1217 return ret;
1218 }
1219
1220 static void handle_delete_modify(struct merge_options *o,
1221 const char *path,
1222 const char *new_path,
1223 unsigned char *a_sha, int a_mode,
1224 unsigned char *b_sha, int b_mode)
1225 {
1226 if (!a_sha) {
1227 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1228 "and modified in %s. Version %s of %s left in tree%s%s.",
1229 path, o->branch1,
1230 o->branch2, o->branch2, path,
1231 path == new_path ? "" : " at ",
1232 path == new_path ? "" : new_path);
1233 update_file(o, 0, b_sha, b_mode, new_path);
1234 } else {
1235 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1236 "and modified in %s. Version %s of %s left in tree%s%s.",
1237 path, o->branch2,
1238 o->branch1, o->branch1, path,
1239 path == new_path ? "" : " at ",
1240 path == new_path ? "" : new_path);
1241 update_file(o, 0, a_sha, a_mode, new_path);
1242 }
1243 }
1244
1245 static int merge_content(struct merge_options *o,
1246 const char *path,
1247 unsigned char *o_sha, int o_mode,
1248 unsigned char *a_sha, int a_mode,
1249 unsigned char *b_sha, int b_mode,
1250 const char *df_rename_conflict_branch)
1251 {
1252 const char *reason = "content";
1253 struct merge_file_info mfi;
1254 struct diff_filespec one, a, b;
1255 struct stat st;
1256 unsigned df_conflict_remains = 0;
1257
1258 if (!o_sha) {
1259 reason = "add/add";
1260 o_sha = (unsigned char *)null_sha1;
1261 }
1262 one.path = a.path = b.path = (char *)path;
1263 hashcpy(one.sha1, o_sha);
1264 one.mode = o_mode;
1265 hashcpy(a.sha1, a_sha);
1266 a.mode = a_mode;
1267 hashcpy(b.sha1, b_sha);
1268 b.mode = b_mode;
1269
1270 mfi = merge_file(o, &one, &a, &b, o->branch1, o->branch2);
1271 if (df_rename_conflict_branch &&
1272 lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1273 df_conflict_remains = 1;
1274 }
1275
1276 if (mfi.clean && !df_conflict_remains &&
1277 sha_eq(mfi.sha, a_sha) && mfi.mode == a.mode)
1278 output(o, 3, "Skipped %s (merged same as existing)", path);
1279 else
1280 output(o, 2, "Auto-merging %s", path);
1281
1282 if (!mfi.clean) {
1283 if (S_ISGITLINK(mfi.mode))
1284 reason = "submodule";
1285 output(o, 1, "CONFLICT (%s): Merge conflict in %s",
1286 reason, path);
1287 }
1288
1289 if (df_conflict_remains) {
1290 const char *new_path;
1291 update_file_flags(o, mfi.sha, mfi.mode, path,
1292 o->call_depth || mfi.clean, 0);
1293 new_path = unique_path(o, path, df_rename_conflict_branch);
1294 mfi.clean = 0;
1295 output(o, 1, "Adding as %s instead", new_path);
1296 update_file_flags(o, mfi.sha, mfi.mode, new_path, 0, 1);
1297 } else {
1298 update_file(o, mfi.clean, mfi.sha, mfi.mode, path);
1299 }
1300 return mfi.clean;
1301
1302 }
1303
1304 /* Per entry merge function */
1305 static int process_entry(struct merge_options *o,
1306 const char *path, struct stage_data *entry)
1307 {
1308 /*
1309 printf("processing entry, clean cache: %s\n", index_only ? "yes": "no");
1310 print_index_entry("\tpath: ", entry);
1311 */
1312 int clean_merge = 1;
1313 int normalize = o->renormalize;
1314 unsigned o_mode = entry->stages[1].mode;
1315 unsigned a_mode = entry->stages[2].mode;
1316 unsigned b_mode = entry->stages[3].mode;
1317 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1318 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1319 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1320
1321 if (entry->rename_df_conflict_info)
1322 return 1; /* Such cases are handled elsewhere. */
1323
1324 entry->processed = 1;
1325 if (o_sha && (!a_sha || !b_sha)) {
1326 /* Case A: Deleted in one */
1327 if ((!a_sha && !b_sha) ||
1328 (!b_sha && blob_unchanged(o_sha, a_sha, normalize, path)) ||
1329 (!a_sha && blob_unchanged(o_sha, b_sha, normalize, path))) {
1330 /* Deleted in both or deleted in one and
1331 * unchanged in the other */
1332 if (a_sha)
1333 output(o, 2, "Removing %s", path);
1334 /* do not touch working file if it did not exist */
1335 remove_file(o, 1, path, !a_sha);
1336 } else if (string_list_has_string(&o->current_directory_set,
1337 path)) {
1338 entry->processed = 0;
1339 return 1; /* Assume clean until processed */
1340 } else {
1341 /* Deleted in one and changed in the other */
1342 clean_merge = 0;
1343 handle_delete_modify(o, path, path,
1344 a_sha, a_mode, b_sha, b_mode);
1345 }
1346
1347 } else if ((!o_sha && a_sha && !b_sha) ||
1348 (!o_sha && !a_sha && b_sha)) {
1349 /* Case B: Added in one. */
1350 unsigned mode;
1351 const unsigned char *sha;
1352
1353 if (a_sha) {
1354 mode = a_mode;
1355 sha = a_sha;
1356 } else {
1357 mode = b_mode;
1358 sha = b_sha;
1359 }
1360 if (string_list_has_string(&o->current_directory_set, path)) {
1361 /* Handle D->F conflicts after all subfiles */
1362 entry->processed = 0;
1363 return 1; /* Assume clean until processed */
1364 } else {
1365 output(o, 2, "Adding %s", path);
1366 update_file(o, 1, sha, mode, path);
1367 }
1368 } else if (a_sha && b_sha) {
1369 /* Case C: Added in both (check for same permissions) and */
1370 /* case D: Modified in both, but differently. */
1371 clean_merge = merge_content(o, path,
1372 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1373 NULL);
1374 } else if (!o_sha && !a_sha && !b_sha) {
1375 /*
1376 * this entry was deleted altogether. a_mode == 0 means
1377 * we had that path and want to actively remove it.
1378 */
1379 remove_file(o, 1, path, !a_mode);
1380 } else
1381 die("Fatal merge failure, shouldn't happen.");
1382
1383 return clean_merge;
1384 }
1385
1386 /*
1387 * Per entry merge function for D/F (and/or rename) conflicts. In the
1388 * cases we can cleanly resolve D/F conflicts, process_entry() can
1389 * clean out all the files below the directory for us. All D/F
1390 * conflict cases must be handled here at the end to make sure any
1391 * directories that can be cleaned out, are.
1392 *
1393 * Some rename conflicts may also be handled here that don't necessarily
1394 * involve D/F conflicts, since the code to handle them is generic enough
1395 * to handle those rename conflicts with or without D/F conflicts also
1396 * being involved.
1397 */
1398 static int process_df_entry(struct merge_options *o,
1399 const char *path, struct stage_data *entry)
1400 {
1401 int clean_merge = 1;
1402 unsigned o_mode = entry->stages[1].mode;
1403 unsigned a_mode = entry->stages[2].mode;
1404 unsigned b_mode = entry->stages[3].mode;
1405 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1406 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1407 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1408 struct stat st;
1409
1410 entry->processed = 1;
1411 if (entry->rename_df_conflict_info) {
1412 struct rename_df_conflict_info *conflict_info = entry->rename_df_conflict_info;
1413 char *src;
1414 switch (conflict_info->rename_type) {
1415 case RENAME_NORMAL:
1416 clean_merge = merge_content(o, path,
1417 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1418 conflict_info->branch1);
1419 break;
1420 case RENAME_DELETE:
1421 clean_merge = 0;
1422 conflict_rename_delete(o, conflict_info->pair1,
1423 conflict_info->branch1,
1424 conflict_info->branch2);
1425 break;
1426 case RENAME_ONE_FILE_TO_TWO:
1427 src = conflict_info->pair1->one->path;
1428 clean_merge = 0;
1429 output(o, 1, "CONFLICT (rename/rename): "
1430 "Rename \"%s\"->\"%s\" in branch \"%s\" "
1431 "rename \"%s\"->\"%s\" in \"%s\"%s",
1432 src, conflict_info->pair1->two->path, conflict_info->branch1,
1433 src, conflict_info->pair2->two->path, conflict_info->branch2,
1434 o->call_depth ? " (left unresolved)" : "");
1435 if (o->call_depth) {
1436 remove_file_from_cache(src);
1437 update_file(o, 0, conflict_info->pair1->one->sha1,
1438 conflict_info->pair1->one->mode, src);
1439 }
1440 conflict_rename_rename_1to2(o, conflict_info->pair1,
1441 conflict_info->branch1,
1442 conflict_info->pair2,
1443 conflict_info->branch2);
1444 conflict_info->dst_entry2->processed = 1;
1445 break;
1446 default:
1447 entry->processed = 0;
1448 break;
1449 }
1450 } else if (o_sha && (!a_sha || !b_sha)) {
1451 /* Modify/delete; deleted side may have put a directory in the way */
1452 const char *new_path = path;
1453 if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode))
1454 new_path = unique_path(o, path, a_sha ? o->branch1 : o->branch2);
1455 clean_merge = 0;
1456 handle_delete_modify(o, path, new_path,
1457 a_sha, a_mode, b_sha, b_mode);
1458 } else if (!o_sha && !!a_sha != !!b_sha) {
1459 /* directory -> (directory, file) */
1460 const char *add_branch;
1461 const char *other_branch;
1462 unsigned mode;
1463 const unsigned char *sha;
1464 const char *conf;
1465
1466 if (a_sha) {
1467 add_branch = o->branch1;
1468 other_branch = o->branch2;
1469 mode = a_mode;
1470 sha = a_sha;
1471 conf = "file/directory";
1472 } else {
1473 add_branch = o->branch2;
1474 other_branch = o->branch1;
1475 mode = b_mode;
1476 sha = b_sha;
1477 conf = "directory/file";
1478 }
1479 if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1480 const char *new_path = unique_path(o, path, add_branch);
1481 clean_merge = 0;
1482 output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. "
1483 "Adding %s as %s",
1484 conf, path, other_branch, path, new_path);
1485 update_file(o, 0, sha, mode, new_path);
1486 } else {
1487 output(o, 2, "Adding %s", path);
1488 update_file(o, 1, sha, mode, path);
1489 }
1490 } else {
1491 entry->processed = 0;
1492 return 1; /* not handled; assume clean until processed */
1493 }
1494
1495 return clean_merge;
1496 }
1497
1498 int merge_trees(struct merge_options *o,
1499 struct tree *head,
1500 struct tree *merge,
1501 struct tree *common,
1502 struct tree **result)
1503 {
1504 int code, clean;
1505
1506 if (o->subtree_shift) {
1507 merge = shift_tree_object(head, merge, o->subtree_shift);
1508 common = shift_tree_object(head, common, o->subtree_shift);
1509 }
1510
1511 if (sha_eq(common->object.sha1, merge->object.sha1)) {
1512 output(o, 0, "Already up-to-date!");
1513 *result = head;
1514 return 1;
1515 }
1516
1517 code = git_merge_trees(o->call_depth, common, head, merge);
1518
1519 if (code != 0) {
1520 if (show(o, 4) || o->call_depth)
1521 die("merging of trees %s and %s failed",
1522 sha1_to_hex(head->object.sha1),
1523 sha1_to_hex(merge->object.sha1));
1524 else
1525 exit(128);
1526 }
1527
1528 if (unmerged_cache()) {
1529 struct string_list *entries, *re_head, *re_merge;
1530 int i;
1531 string_list_clear(&o->current_file_set, 1);
1532 string_list_clear(&o->current_directory_set, 1);
1533 get_files_dirs(o, head);
1534 get_files_dirs(o, merge);
1535
1536 entries = get_unmerged();
1537 make_room_for_directories_of_df_conflicts(o, entries);
1538 re_head = get_renames(o, head, common, head, merge, entries);
1539 re_merge = get_renames(o, merge, common, head, merge, entries);
1540 clean = process_renames(o, re_head, re_merge);
1541 for (i = 0; i < entries->nr; i++) {
1542 const char *path = entries->items[i].string;
1543 struct stage_data *e = entries->items[i].util;
1544 if (!e->processed
1545 && !process_entry(o, path, e))
1546 clean = 0;
1547 }
1548 for (i = 0; i < entries->nr; i++) {
1549 const char *path = entries->items[i].string;
1550 struct stage_data *e = entries->items[i].util;
1551 if (!e->processed
1552 && !process_df_entry(o, path, e))
1553 clean = 0;
1554 }
1555 for (i = 0; i < entries->nr; i++) {
1556 struct stage_data *e = entries->items[i].util;
1557 if (!e->processed)
1558 die("Unprocessed path??? %s",
1559 entries->items[i].string);
1560 }
1561
1562 string_list_clear(re_merge, 0);
1563 string_list_clear(re_head, 0);
1564 string_list_clear(entries, 1);
1565
1566 }
1567 else
1568 clean = 1;
1569
1570 if (o->call_depth)
1571 *result = write_tree_from_memory(o);
1572
1573 return clean;
1574 }
1575
1576 static struct commit_list *reverse_commit_list(struct commit_list *list)
1577 {
1578 struct commit_list *next = NULL, *current, *backup;
1579 for (current = list; current; current = backup) {
1580 backup = current->next;
1581 current->next = next;
1582 next = current;
1583 }
1584 return next;
1585 }
1586
1587 /*
1588 * Merge the commits h1 and h2, return the resulting virtual
1589 * commit object and a flag indicating the cleanness of the merge.
1590 */
1591 int merge_recursive(struct merge_options *o,
1592 struct commit *h1,
1593 struct commit *h2,
1594 struct commit_list *ca,
1595 struct commit **result)
1596 {
1597 struct commit_list *iter;
1598 struct commit *merged_common_ancestors;
1599 struct tree *mrtree = mrtree;
1600 int clean;
1601
1602 if (show(o, 4)) {
1603 output(o, 4, "Merging:");
1604 output_commit_title(o, h1);
1605 output_commit_title(o, h2);
1606 }
1607
1608 if (!ca) {
1609 ca = get_merge_bases(h1, h2, 1);
1610 ca = reverse_commit_list(ca);
1611 }
1612
1613 if (show(o, 5)) {
1614 output(o, 5, "found %u common ancestor(s):", commit_list_count(ca));
1615 for (iter = ca; iter; iter = iter->next)
1616 output_commit_title(o, iter->item);
1617 }
1618
1619 merged_common_ancestors = pop_commit(&ca);
1620 if (merged_common_ancestors == NULL) {
1621 /* if there is no common ancestor, make an empty tree */
1622 struct tree *tree = xcalloc(1, sizeof(struct tree));
1623
1624 tree->object.parsed = 1;
1625 tree->object.type = OBJ_TREE;
1626 pretend_sha1_file(NULL, 0, OBJ_TREE, tree->object.sha1);
1627 merged_common_ancestors = make_virtual_commit(tree, "ancestor");
1628 }
1629
1630 for (iter = ca; iter; iter = iter->next) {
1631 const char *saved_b1, *saved_b2;
1632 o->call_depth++;
1633 /*
1634 * When the merge fails, the result contains files
1635 * with conflict markers. The cleanness flag is
1636 * ignored, it was never actually used, as result of
1637 * merge_trees has always overwritten it: the committed
1638 * "conflicts" were already resolved.
1639 */
1640 discard_cache();
1641 saved_b1 = o->branch1;
1642 saved_b2 = o->branch2;
1643 o->branch1 = "Temporary merge branch 1";
1644 o->branch2 = "Temporary merge branch 2";
1645 merge_recursive(o, merged_common_ancestors, iter->item,
1646 NULL, &merged_common_ancestors);
1647 o->branch1 = saved_b1;
1648 o->branch2 = saved_b2;
1649 o->call_depth--;
1650
1651 if (!merged_common_ancestors)
1652 die("merge returned no commit");
1653 }
1654
1655 discard_cache();
1656 if (!o->call_depth)
1657 read_cache();
1658
1659 o->ancestor = "merged common ancestors";
1660 clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
1661 &mrtree);
1662
1663 if (o->call_depth) {
1664 *result = make_virtual_commit(mrtree, "merged tree");
1665 commit_list_insert(h1, &(*result)->parents);
1666 commit_list_insert(h2, &(*result)->parents->next);
1667 }
1668 flush_output(o);
1669 return clean;
1670 }
1671
1672 static struct commit *get_ref(const unsigned char *sha1, const char *name)
1673 {
1674 struct object *object;
1675
1676 object = deref_tag(parse_object(sha1), name, strlen(name));
1677 if (!object)
1678 return NULL;
1679 if (object->type == OBJ_TREE)
1680 return make_virtual_commit((struct tree*)object, name);
1681 if (object->type != OBJ_COMMIT)
1682 return NULL;
1683 if (parse_commit((struct commit *)object))
1684 return NULL;
1685 return (struct commit *)object;
1686 }
1687
1688 int merge_recursive_generic(struct merge_options *o,
1689 const unsigned char *head,
1690 const unsigned char *merge,
1691 int num_base_list,
1692 const unsigned char **base_list,
1693 struct commit **result)
1694 {
1695 int clean, index_fd;
1696 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
1697 struct commit *head_commit = get_ref(head, o->branch1);
1698 struct commit *next_commit = get_ref(merge, o->branch2);
1699 struct commit_list *ca = NULL;
1700
1701 if (base_list) {
1702 int i;
1703 for (i = 0; i < num_base_list; ++i) {
1704 struct commit *base;
1705 if (!(base = get_ref(base_list[i], sha1_to_hex(base_list[i]))))
1706 return error("Could not parse object '%s'",
1707 sha1_to_hex(base_list[i]));
1708 commit_list_insert(base, &ca);
1709 }
1710 }
1711
1712 index_fd = hold_locked_index(lock, 1);
1713 clean = merge_recursive(o, head_commit, next_commit, ca,
1714 result);
1715 if (active_cache_changed &&
1716 (write_cache(index_fd, active_cache, active_nr) ||
1717 commit_locked_index(lock)))
1718 return error("Unable to write index.");
1719
1720 return clean ? 0 : 1;
1721 }
1722
1723 static int merge_recursive_config(const char *var, const char *value, void *cb)
1724 {
1725 struct merge_options *o = cb;
1726 if (!strcasecmp(var, "merge.verbosity")) {
1727 o->verbosity = git_config_int(var, value);
1728 return 0;
1729 }
1730 if (!strcasecmp(var, "diff.renamelimit")) {
1731 o->diff_rename_limit = git_config_int(var, value);
1732 return 0;
1733 }
1734 if (!strcasecmp(var, "merge.renamelimit")) {
1735 o->merge_rename_limit = git_config_int(var, value);
1736 return 0;
1737 }
1738 return git_xmerge_config(var, value, cb);
1739 }
1740
1741 void init_merge_options(struct merge_options *o)
1742 {
1743 memset(o, 0, sizeof(struct merge_options));
1744 o->verbosity = 2;
1745 o->buffer_output = 1;
1746 o->diff_rename_limit = -1;
1747 o->merge_rename_limit = -1;
1748 o->renormalize = 0;
1749 git_config(merge_recursive_config, o);
1750 if (getenv("GIT_MERGE_VERBOSITY"))
1751 o->verbosity =
1752 strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10);
1753 if (o->verbosity >= 5)
1754 o->buffer_output = 0;
1755 strbuf_init(&o->obuf, 0);
1756 memset(&o->current_file_set, 0, sizeof(struct string_list));
1757 o->current_file_set.strdup_strings = 1;
1758 memset(&o->current_directory_set, 0, sizeof(struct string_list));
1759 o->current_directory_set.strdup_strings = 1;
1760 }
1761
1762 int parse_merge_opt(struct merge_options *o, const char *s)
1763 {
1764 if (!s || !*s)
1765 return -1;
1766 if (!strcmp(s, "ours"))
1767 o->recursive_variant = MERGE_RECURSIVE_OURS;
1768 else if (!strcmp(s, "theirs"))
1769 o->recursive_variant = MERGE_RECURSIVE_THEIRS;
1770 else if (!strcmp(s, "subtree"))
1771 o->subtree_shift = "";
1772 else if (!prefixcmp(s, "subtree="))
1773 o->subtree_shift = s + strlen("subtree=");
1774 else if (!strcmp(s, "patience"))
1775 o->xdl_opts |= XDF_PATIENCE_DIFF;
1776 else if (!strcmp(s, "ignore-space-change"))
1777 o->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
1778 else if (!strcmp(s, "ignore-all-space"))
1779 o->xdl_opts |= XDF_IGNORE_WHITESPACE;
1780 else if (!strcmp(s, "ignore-space-at-eol"))
1781 o->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
1782 else if (!strcmp(s, "renormalize"))
1783 o->renormalize = 1;
1784 else if (!strcmp(s, "no-renormalize"))
1785 o->renormalize = 0;
1786 else if (!prefixcmp(s, "rename-threshold=")) {
1787 const char *score = s + strlen("rename-threshold=");
1788 if ((o->rename_score = parse_rename_score(&score)) == -1 || *score != 0)
1789 return -1;
1790 }
1791 else
1792 return -1;
1793 return 0;
1794 }