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231e5cbd7f87c95f909709cc649bfb202a4ece87
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"
25 static struct tree *shift_tree_object(struct tree *one, struct tree *two,
26 const char *subtree_shift)
27 {
28 unsigned char shifted[20];
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 }
41 /*
42 * A virtual commit has (const char *)commit->util set to the name.
43 */
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 }
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 }
66 enum rename_type {
67 RENAME_NORMAL = 0,
68 RENAME_DELETE,
69 RENAME_ONE_FILE_TO_TWO
70 };
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 };
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 };
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;
111 ci->dst_entry1 = dst_entry1;
112 dst_entry1->rename_df_conflict_info = ci;
113 dst_entry1->processed = 0;
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 }
124 static int show(struct merge_options *o, int v)
125 {
126 return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5;
127 }
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 }
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;
143 if (!show(o, v))
144 return;
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);
150 va_start(ap, fmt);
151 len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap);
152 va_end(ap);
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 }
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 }
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 }
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 }
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;
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");
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);
233 rc = unpack_trees(3, t, &opts);
234 cache_tree_free(&active_cache_tree);
235 return rc;
236 }
238 struct tree *write_tree_from_memory(struct merge_options *o)
239 {
240 struct tree *result = NULL;
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 }
254 if (!active_cache_tree)
255 active_cache_tree = cache_tree();
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");
262 result = lookup_tree(active_cache_tree->sha1);
264 return result;
265 }
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;
275 memcpy(newpath, base, baselen);
276 memcpy(newpath + baselen, path, len);
277 newpath[baselen + len] = '\0';
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);
285 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
286 }
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 }
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 }
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;
327 unmerged->strdup_strings = 1;
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;
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 }
346 return unmerged;
347 }
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;
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;
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 }
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 }
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 };
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;
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.warn_on_too_large_rename = 1;
439 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
440 if (diff_setup_done(&opts) < 0)
441 die("diff setup failed");
442 diff_tree_sha1(o_tree->object.sha1, tree->object.sha1, "", &opts);
443 diffcore_std(&opts);
444 for (i = 0; i < diff_queued_diff.nr; ++i) {
445 struct string_list_item *item;
446 struct rename *re;
447 struct diff_filepair *pair = diff_queued_diff.queue[i];
448 if (pair->status != 'R') {
449 diff_free_filepair(pair);
450 continue;
451 }
452 re = xmalloc(sizeof(*re));
453 re->processed = 0;
454 re->pair = pair;
455 item = string_list_lookup(entries, re->pair->one->path);
456 if (!item)
457 re->src_entry = insert_stage_data(re->pair->one->path,
458 o_tree, a_tree, b_tree, entries);
459 else
460 re->src_entry = item->util;
462 item = string_list_lookup(entries, re->pair->two->path);
463 if (!item)
464 re->dst_entry = insert_stage_data(re->pair->two->path,
465 o_tree, a_tree, b_tree, entries);
466 else
467 re->dst_entry = item->util;
468 item = string_list_insert(renames, pair->one->path);
469 item->util = re;
470 }
471 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
472 diff_queued_diff.nr = 0;
473 diff_flush(&opts);
474 return renames;
475 }
477 static int update_stages_options(const char *path, struct diff_filespec *o,
478 struct diff_filespec *a, struct diff_filespec *b,
479 int clear, int options)
480 {
481 if (clear)
482 if (remove_file_from_cache(path))
483 return -1;
484 if (o)
485 if (add_cacheinfo(o->mode, o->sha1, path, 1, 0, options))
486 return -1;
487 if (a)
488 if (add_cacheinfo(a->mode, a->sha1, path, 2, 0, options))
489 return -1;
490 if (b)
491 if (add_cacheinfo(b->mode, b->sha1, path, 3, 0, options))
492 return -1;
493 return 0;
494 }
496 static int update_stages(const char *path, struct diff_filespec *o,
497 struct diff_filespec *a, struct diff_filespec *b,
498 int clear)
499 {
500 int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE;
501 return update_stages_options(path, o, a, b, clear, options);
502 }
504 static int update_stages_and_entry(const char *path,
505 struct stage_data *entry,
506 struct diff_filespec *o,
507 struct diff_filespec *a,
508 struct diff_filespec *b,
509 int clear)
510 {
511 int options;
513 entry->processed = 0;
514 entry->stages[1].mode = o->mode;
515 entry->stages[2].mode = a->mode;
516 entry->stages[3].mode = b->mode;
517 hashcpy(entry->stages[1].sha, o->sha1);
518 hashcpy(entry->stages[2].sha, a->sha1);
519 hashcpy(entry->stages[3].sha, b->sha1);
520 options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_SKIP_DFCHECK;
521 return update_stages_options(path, o, a, b, clear, options);
522 }
524 static int remove_file(struct merge_options *o, int clean,
525 const char *path, int no_wd)
526 {
527 int update_cache = o->call_depth || clean;
528 int update_working_directory = !o->call_depth && !no_wd;
530 if (update_cache) {
531 if (remove_file_from_cache(path))
532 return -1;
533 }
534 if (update_working_directory) {
535 if (remove_path(path))
536 return -1;
537 }
538 return 0;
539 }
541 static char *unique_path(struct merge_options *o, const char *path, const char *branch)
542 {
543 char *newpath = xmalloc(strlen(path) + 1 + strlen(branch) + 8 + 1);
544 int suffix = 0;
545 struct stat st;
546 char *p = newpath + strlen(path);
547 strcpy(newpath, path);
548 *(p++) = '~';
549 strcpy(p, branch);
550 for (; *p; ++p)
551 if ('/' == *p)
552 *p = '_';
553 while (string_list_has_string(&o->current_file_set, newpath) ||
554 string_list_has_string(&o->current_directory_set, newpath) ||
555 lstat(newpath, &st) == 0)
556 sprintf(p, "_%d", suffix++);
558 string_list_insert(&o->current_file_set, newpath);
559 return newpath;
560 }
562 static void flush_buffer(int fd, const char *buf, unsigned long size)
563 {
564 while (size > 0) {
565 long ret = write_in_full(fd, buf, size);
566 if (ret < 0) {
567 /* Ignore epipe */
568 if (errno == EPIPE)
569 break;
570 die_errno("merge-recursive");
571 } else if (!ret) {
572 die("merge-recursive: disk full?");
573 }
574 size -= ret;
575 buf += ret;
576 }
577 }
579 static int would_lose_untracked(const char *path)
580 {
581 int pos = cache_name_pos(path, strlen(path));
583 if (pos < 0)
584 pos = -1 - pos;
585 while (pos < active_nr &&
586 !strcmp(path, active_cache[pos]->name)) {
587 /*
588 * If stage #0, it is definitely tracked.
589 * If it has stage #2 then it was tracked
590 * before this merge started. All other
591 * cases the path was not tracked.
592 */
593 switch (ce_stage(active_cache[pos])) {
594 case 0:
595 case 2:
596 return 0;
597 }
598 pos++;
599 }
600 return file_exists(path);
601 }
603 static int make_room_for_path(const char *path)
604 {
605 int status;
606 const char *msg = "failed to create path '%s'%s";
608 status = safe_create_leading_directories_const(path);
609 if (status) {
610 if (status == -3) {
611 /* something else exists */
612 error(msg, path, ": perhaps a D/F conflict?");
613 return -1;
614 }
615 die(msg, path, "");
616 }
618 /*
619 * Do not unlink a file in the work tree if we are not
620 * tracking it.
621 */
622 if (would_lose_untracked(path))
623 return error("refusing to lose untracked file at '%s'",
624 path);
626 /* Successful unlink is good.. */
627 if (!unlink(path))
628 return 0;
629 /* .. and so is no existing file */
630 if (errno == ENOENT)
631 return 0;
632 /* .. but not some other error (who really cares what?) */
633 return error(msg, path, ": perhaps a D/F conflict?");
634 }
636 static void update_file_flags(struct merge_options *o,
637 const unsigned char *sha,
638 unsigned mode,
639 const char *path,
640 int update_cache,
641 int update_wd)
642 {
643 if (o->call_depth)
644 update_wd = 0;
646 if (update_wd) {
647 enum object_type type;
648 void *buf;
649 unsigned long size;
651 if (S_ISGITLINK(mode)) {
652 /*
653 * We may later decide to recursively descend into
654 * the submodule directory and update its index
655 * and/or work tree, but we do not do that now.
656 */
657 update_wd = 0;
658 goto update_index;
659 }
661 buf = read_sha1_file(sha, &type, &size);
662 if (!buf)
663 die("cannot read object %s '%s'", sha1_to_hex(sha), path);
664 if (type != OBJ_BLOB)
665 die("blob expected for %s '%s'", sha1_to_hex(sha), path);
666 if (S_ISREG(mode)) {
667 struct strbuf strbuf = STRBUF_INIT;
668 if (convert_to_working_tree(path, buf, size, &strbuf)) {
669 free(buf);
670 size = strbuf.len;
671 buf = strbuf_detach(&strbuf, NULL);
672 }
673 }
675 if (make_room_for_path(path) < 0) {
676 update_wd = 0;
677 free(buf);
678 goto update_index;
679 }
680 if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
681 int fd;
682 if (mode & 0100)
683 mode = 0777;
684 else
685 mode = 0666;
686 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
687 if (fd < 0)
688 die_errno("failed to open '%s'", path);
689 flush_buffer(fd, buf, size);
690 close(fd);
691 } else if (S_ISLNK(mode)) {
692 char *lnk = xmemdupz(buf, size);
693 safe_create_leading_directories_const(path);
694 unlink(path);
695 if (symlink(lnk, path))
696 die_errno("failed to symlink '%s'", path);
697 free(lnk);
698 } else
699 die("do not know what to do with %06o %s '%s'",
700 mode, sha1_to_hex(sha), path);
701 free(buf);
702 }
703 update_index:
704 if (update_cache)
705 add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
706 }
708 static void update_file(struct merge_options *o,
709 int clean,
710 const unsigned char *sha,
711 unsigned mode,
712 const char *path)
713 {
714 update_file_flags(o, sha, mode, path, o->call_depth || clean, !o->call_depth);
715 }
717 /* Low level file merging, update and removal */
719 struct merge_file_info
720 {
721 unsigned char sha[20];
722 unsigned mode;
723 unsigned clean:1,
724 merge:1;
725 };
727 static int merge_3way(struct merge_options *o,
728 mmbuffer_t *result_buf,
729 struct diff_filespec *one,
730 struct diff_filespec *a,
731 struct diff_filespec *b,
732 const char *branch1,
733 const char *branch2)
734 {
735 mmfile_t orig, src1, src2;
736 char *base_name, *name1, *name2;
737 int merge_status;
738 int favor;
740 if (o->call_depth)
741 favor = 0;
742 else {
743 switch (o->recursive_variant) {
744 case MERGE_RECURSIVE_OURS:
745 favor = XDL_MERGE_FAVOR_OURS;
746 break;
747 case MERGE_RECURSIVE_THEIRS:
748 favor = XDL_MERGE_FAVOR_THEIRS;
749 break;
750 default:
751 favor = 0;
752 break;
753 }
754 }
756 if (strcmp(a->path, b->path) ||
757 (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) {
758 base_name = o->ancestor == NULL ? NULL :
759 xstrdup(mkpath("%s:%s", o->ancestor, one->path));
760 name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
761 name2 = xstrdup(mkpath("%s:%s", branch2, b->path));
762 } else {
763 base_name = o->ancestor == NULL ? NULL :
764 xstrdup(mkpath("%s", o->ancestor));
765 name1 = xstrdup(mkpath("%s", branch1));
766 name2 = xstrdup(mkpath("%s", branch2));
767 }
769 read_mmblob(&orig, one->sha1);
770 read_mmblob(&src1, a->sha1);
771 read_mmblob(&src2, b->sha1);
773 merge_status = ll_merge(result_buf, a->path, &orig, base_name,
774 &src1, name1, &src2, name2,
775 ((o->call_depth ? LL_OPT_VIRTUAL_ANCESTOR : 0) |
776 (o->renormalize ? LL_OPT_RENORMALIZE : 0) |
777 create_ll_flag(favor)));
779 free(name1);
780 free(name2);
781 free(orig.ptr);
782 free(src1.ptr);
783 free(src2.ptr);
784 return merge_status;
785 }
787 static struct merge_file_info merge_file(struct merge_options *o,
788 struct diff_filespec *one,
789 struct diff_filespec *a,
790 struct diff_filespec *b,
791 const char *branch1,
792 const char *branch2)
793 {
794 struct merge_file_info result;
795 result.merge = 0;
796 result.clean = 1;
798 if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) {
799 result.clean = 0;
800 if (S_ISREG(a->mode)) {
801 result.mode = a->mode;
802 hashcpy(result.sha, a->sha1);
803 } else {
804 result.mode = b->mode;
805 hashcpy(result.sha, b->sha1);
806 }
807 } else {
808 if (!sha_eq(a->sha1, one->sha1) && !sha_eq(b->sha1, one->sha1))
809 result.merge = 1;
811 /*
812 * Merge modes
813 */
814 if (a->mode == b->mode || a->mode == one->mode)
815 result.mode = b->mode;
816 else {
817 result.mode = a->mode;
818 if (b->mode != one->mode) {
819 result.clean = 0;
820 result.merge = 1;
821 }
822 }
824 if (sha_eq(a->sha1, b->sha1) || sha_eq(a->sha1, one->sha1))
825 hashcpy(result.sha, b->sha1);
826 else if (sha_eq(b->sha1, one->sha1))
827 hashcpy(result.sha, a->sha1);
828 else if (S_ISREG(a->mode)) {
829 mmbuffer_t result_buf;
830 int merge_status;
832 merge_status = merge_3way(o, &result_buf, one, a, b,
833 branch1, branch2);
835 if ((merge_status < 0) || !result_buf.ptr)
836 die("Failed to execute internal merge");
838 if (write_sha1_file(result_buf.ptr, result_buf.size,
839 blob_type, result.sha))
840 die("Unable to add %s to database",
841 a->path);
843 free(result_buf.ptr);
844 result.clean = (merge_status == 0);
845 } else if (S_ISGITLINK(a->mode)) {
846 result.clean = merge_submodule(result.sha, one->path, one->sha1,
847 a->sha1, b->sha1);
848 } else if (S_ISLNK(a->mode)) {
849 hashcpy(result.sha, a->sha1);
851 if (!sha_eq(a->sha1, b->sha1))
852 result.clean = 0;
853 } else {
854 die("unsupported object type in the tree");
855 }
856 }
858 return result;
859 }
861 static void conflict_rename_delete(struct merge_options *o,
862 struct diff_filepair *pair,
863 const char *rename_branch,
864 const char *other_branch)
865 {
866 char *dest_name = pair->two->path;
867 int df_conflict = 0;
868 struct stat st;
870 output(o, 1, "CONFLICT (rename/delete): Rename %s->%s in %s "
871 "and deleted in %s",
872 pair->one->path, pair->two->path, rename_branch,
873 other_branch);
874 if (!o->call_depth)
875 update_stages(dest_name, NULL,
876 rename_branch == o->branch1 ? pair->two : NULL,
877 rename_branch == o->branch1 ? NULL : pair->two,
878 1);
879 if (lstat(dest_name, &st) == 0 && S_ISDIR(st.st_mode)) {
880 dest_name = unique_path(o, dest_name, rename_branch);
881 df_conflict = 1;
882 }
883 update_file(o, 0, pair->two->sha1, pair->two->mode, dest_name);
884 if (df_conflict)
885 free(dest_name);
886 }
888 static void conflict_rename_rename_1to2(struct merge_options *o,
889 struct diff_filepair *pair1,
890 const char *branch1,
891 struct diff_filepair *pair2,
892 const char *branch2)
893 {
894 /* One file was renamed in both branches, but to different names. */
895 char *del[2];
896 int delp = 0;
897 const char *ren1_dst = pair1->two->path;
898 const char *ren2_dst = pair2->two->path;
899 const char *dst_name1 = ren1_dst;
900 const char *dst_name2 = ren2_dst;
901 struct stat st;
902 if (lstat(ren1_dst, &st) == 0 && S_ISDIR(st.st_mode)) {
903 dst_name1 = del[delp++] = unique_path(o, ren1_dst, branch1);
904 output(o, 1, "%s is a directory in %s adding as %s instead",
905 ren1_dst, branch2, dst_name1);
906 }
907 if (lstat(ren2_dst, &st) == 0 && S_ISDIR(st.st_mode)) {
908 dst_name2 = del[delp++] = unique_path(o, ren2_dst, branch2);
909 output(o, 1, "%s is a directory in %s adding as %s instead",
910 ren2_dst, branch1, dst_name2);
911 }
912 if (o->call_depth) {
913 remove_file_from_cache(dst_name1);
914 remove_file_from_cache(dst_name2);
915 /*
916 * Uncomment to leave the conflicting names in the resulting tree
917 *
918 * update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1);
919 * update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2);
920 */
921 } else {
922 update_stages(ren1_dst, NULL, pair1->two, NULL, 1);
923 update_stages(ren2_dst, NULL, NULL, pair2->two, 1);
925 update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1);
926 update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2);
927 }
928 while (delp--)
929 free(del[delp]);
930 }
932 static void conflict_rename_rename_2to1(struct merge_options *o,
933 struct rename *ren1,
934 const char *branch1,
935 struct rename *ren2,
936 const char *branch2)
937 {
938 /* Two files were renamed to the same thing. */
939 char *new_path1 = unique_path(o, ren1->pair->two->path, branch1);
940 char *new_path2 = unique_path(o, ren2->pair->two->path, branch2);
941 output(o, 1, "Renaming %s to %s and %s to %s instead",
942 ren1->pair->one->path, new_path1,
943 ren2->pair->one->path, new_path2);
944 remove_file(o, 0, ren1->pair->two->path, 0);
945 update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path1);
946 update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, new_path2);
947 free(new_path2);
948 free(new_path1);
949 }
951 static int process_renames(struct merge_options *o,
952 struct string_list *a_renames,
953 struct string_list *b_renames)
954 {
955 int clean_merge = 1, i, j;
956 struct string_list a_by_dst = STRING_LIST_INIT_NODUP;
957 struct string_list b_by_dst = STRING_LIST_INIT_NODUP;
958 const struct rename *sre;
960 for (i = 0; i < a_renames->nr; i++) {
961 sre = a_renames->items[i].util;
962 string_list_insert(&a_by_dst, sre->pair->two->path)->util
963 = sre->dst_entry;
964 }
965 for (i = 0; i < b_renames->nr; i++) {
966 sre = b_renames->items[i].util;
967 string_list_insert(&b_by_dst, sre->pair->two->path)->util
968 = sre->dst_entry;
969 }
971 for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
972 char *src;
973 struct string_list *renames1, *renames2Dst;
974 struct rename *ren1 = NULL, *ren2 = NULL;
975 const char *branch1, *branch2;
976 const char *ren1_src, *ren1_dst;
978 if (i >= a_renames->nr) {
979 ren2 = b_renames->items[j++].util;
980 } else if (j >= b_renames->nr) {
981 ren1 = a_renames->items[i++].util;
982 } else {
983 int compare = strcmp(a_renames->items[i].string,
984 b_renames->items[j].string);
985 if (compare <= 0)
986 ren1 = a_renames->items[i++].util;
987 if (compare >= 0)
988 ren2 = b_renames->items[j++].util;
989 }
991 /* TODO: refactor, so that 1/2 are not needed */
992 if (ren1) {
993 renames1 = a_renames;
994 renames2Dst = &b_by_dst;
995 branch1 = o->branch1;
996 branch2 = o->branch2;
997 } else {
998 struct rename *tmp;
999 renames1 = b_renames;
1000 renames2Dst = &a_by_dst;
1001 branch1 = o->branch2;
1002 branch2 = o->branch1;
1003 tmp = ren2;
1004 ren2 = ren1;
1005 ren1 = tmp;
1006 }
1007 src = ren1->pair->one->path;
1009 ren1->dst_entry->processed = 1;
1010 ren1->src_entry->processed = 1;
1012 if (ren1->processed)
1013 continue;
1014 ren1->processed = 1;
1016 ren1_src = ren1->pair->one->path;
1017 ren1_dst = ren1->pair->two->path;
1019 if (ren2) {
1020 const char *ren2_src = ren2->pair->one->path;
1021 const char *ren2_dst = ren2->pair->two->path;
1022 /* Renamed in 1 and renamed in 2 */
1023 if (strcmp(ren1_src, ren2_src) != 0)
1024 die("ren1.src != ren2.src");
1025 ren2->dst_entry->processed = 1;
1026 ren2->processed = 1;
1027 if (strcmp(ren1_dst, ren2_dst) != 0) {
1028 setup_rename_df_conflict_info(RENAME_ONE_FILE_TO_TWO,
1029 ren1->pair,
1030 ren2->pair,
1031 branch1,
1032 branch2,
1033 ren1->dst_entry,
1034 ren2->dst_entry);
1035 } else {
1036 remove_file(o, 1, ren1_src, 1);
1037 update_stages_and_entry(ren1_dst,
1038 ren1->dst_entry,
1039 ren1->pair->one,
1040 ren1->pair->two,
1041 ren2->pair->two,
1042 1 /* clear */);
1043 }
1044 } else {
1045 /* Renamed in 1, maybe changed in 2 */
1046 struct string_list_item *item;
1047 /* we only use sha1 and mode of these */
1048 struct diff_filespec src_other, dst_other;
1049 int try_merge;
1051 /*
1052 * unpack_trees loads entries from common-commit
1053 * into stage 1, from head-commit into stage 2, and
1054 * from merge-commit into stage 3. We keep track
1055 * of which side corresponds to the rename.
1056 */
1057 int renamed_stage = a_renames == renames1 ? 2 : 3;
1058 int other_stage = a_renames == renames1 ? 3 : 2;
1060 remove_file(o, 1, ren1_src, o->call_depth || renamed_stage == 2);
1062 hashcpy(src_other.sha1, ren1->src_entry->stages[other_stage].sha);
1063 src_other.mode = ren1->src_entry->stages[other_stage].mode;
1064 hashcpy(dst_other.sha1, ren1->dst_entry->stages[other_stage].sha);
1065 dst_other.mode = ren1->dst_entry->stages[other_stage].mode;
1066 try_merge = 0;
1068 if (sha_eq(src_other.sha1, null_sha1)) {
1069 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
1070 ren1->dst_entry->processed = 0;
1071 setup_rename_df_conflict_info(RENAME_DELETE,
1072 ren1->pair,
1073 NULL,
1074 branch1,
1075 branch2,
1076 ren1->dst_entry,
1077 NULL);
1078 } else {
1079 clean_merge = 0;
1080 conflict_rename_delete(o, ren1->pair, branch1, branch2);
1081 }
1082 } else if ((dst_other.mode == ren1->pair->two->mode) &&
1083 sha_eq(dst_other.sha1, ren1->pair->two->sha1)) {
1084 /* Added file on the other side
1085 identical to the file being
1086 renamed: clean merge */
1087 update_file(o, 1, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst);
1088 } else if (!sha_eq(dst_other.sha1, null_sha1)) {
1089 const char *new_path;
1090 clean_merge = 0;
1091 try_merge = 1;
1092 output(o, 1, "CONFLICT (rename/add): Rename %s->%s in %s. "
1093 "%s added in %s",
1094 ren1_src, ren1_dst, branch1,
1095 ren1_dst, branch2);
1096 if (o->call_depth) {
1097 struct merge_file_info mfi;
1098 struct diff_filespec one, a, b;
1100 one.path = a.path = b.path =
1101 (char *)ren1_dst;
1102 hashcpy(one.sha1, null_sha1);
1103 one.mode = 0;
1104 hashcpy(a.sha1, ren1->pair->two->sha1);
1105 a.mode = ren1->pair->two->mode;
1106 hashcpy(b.sha1, dst_other.sha1);
1107 b.mode = dst_other.mode;
1108 mfi = merge_file(o, &one, &a, &b,
1109 branch1,
1110 branch2);
1111 output(o, 1, "Adding merged %s", ren1_dst);
1112 update_file(o, 0,
1113 mfi.sha,
1114 mfi.mode,
1115 ren1_dst);
1116 try_merge = 0;
1117 } else {
1118 new_path = unique_path(o, ren1_dst, branch2);
1119 output(o, 1, "Adding as %s instead", new_path);
1120 update_file(o, 0, dst_other.sha1, dst_other.mode, new_path);
1121 }
1122 } else if ((item = string_list_lookup(renames2Dst, ren1_dst))) {
1123 ren2 = item->util;
1124 clean_merge = 0;
1125 ren2->processed = 1;
1126 output(o, 1, "CONFLICT (rename/rename): "
1127 "Rename %s->%s in %s. "
1128 "Rename %s->%s in %s",
1129 ren1_src, ren1_dst, branch1,
1130 ren2->pair->one->path, ren2->pair->two->path, branch2);
1131 conflict_rename_rename_2to1(o, ren1, branch1, ren2, branch2);
1132 } else
1133 try_merge = 1;
1135 if (try_merge) {
1136 struct diff_filespec *one, *a, *b;
1137 src_other.path = (char *)ren1_src;
1139 one = ren1->pair->one;
1140 if (a_renames == renames1) {
1141 a = ren1->pair->two;
1142 b = &src_other;
1143 } else {
1144 b = ren1->pair->two;
1145 a = &src_other;
1146 }
1147 update_stages_and_entry(ren1_dst, ren1->dst_entry, one, a, b, 1);
1148 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
1149 setup_rename_df_conflict_info(RENAME_NORMAL,
1150 ren1->pair,
1151 NULL,
1152 branch1,
1153 NULL,
1154 ren1->dst_entry,
1155 NULL);
1156 }
1157 }
1158 }
1159 }
1160 string_list_clear(&a_by_dst, 0);
1161 string_list_clear(&b_by_dst, 0);
1163 return clean_merge;
1164 }
1166 static unsigned char *stage_sha(const unsigned char *sha, unsigned mode)
1167 {
1168 return (is_null_sha1(sha) || mode == 0) ? NULL: (unsigned char *)sha;
1169 }
1171 static int read_sha1_strbuf(const unsigned char *sha1, struct strbuf *dst)
1172 {
1173 void *buf;
1174 enum object_type type;
1175 unsigned long size;
1176 buf = read_sha1_file(sha1, &type, &size);
1177 if (!buf)
1178 return error("cannot read object %s", sha1_to_hex(sha1));
1179 if (type != OBJ_BLOB) {
1180 free(buf);
1181 return error("object %s is not a blob", sha1_to_hex(sha1));
1182 }
1183 strbuf_attach(dst, buf, size, size + 1);
1184 return 0;
1185 }
1187 static int blob_unchanged(const unsigned char *o_sha,
1188 const unsigned char *a_sha,
1189 int renormalize, const char *path)
1190 {
1191 struct strbuf o = STRBUF_INIT;
1192 struct strbuf a = STRBUF_INIT;
1193 int ret = 0; /* assume changed for safety */
1195 if (sha_eq(o_sha, a_sha))
1196 return 1;
1197 if (!renormalize)
1198 return 0;
1200 assert(o_sha && a_sha);
1201 if (read_sha1_strbuf(o_sha, &o) || read_sha1_strbuf(a_sha, &a))
1202 goto error_return;
1203 /*
1204 * Note: binary | is used so that both renormalizations are
1205 * performed. Comparison can be skipped if both files are
1206 * unchanged since their sha1s have already been compared.
1207 */
1208 if (renormalize_buffer(path, o.buf, o.len, &o) |
1209 renormalize_buffer(path, a.buf, o.len, &a))
1210 ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len));
1212 error_return:
1213 strbuf_release(&o);
1214 strbuf_release(&a);
1215 return ret;
1216 }
1218 static void handle_delete_modify(struct merge_options *o,
1219 const char *path,
1220 const char *new_path,
1221 unsigned char *a_sha, int a_mode,
1222 unsigned char *b_sha, int b_mode)
1223 {
1224 if (!a_sha) {
1225 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1226 "and modified in %s. Version %s of %s left in tree%s%s.",
1227 path, o->branch1,
1228 o->branch2, o->branch2, path,
1229 path == new_path ? "" : " at ",
1230 path == new_path ? "" : new_path);
1231 update_file(o, 0, b_sha, b_mode, new_path);
1232 } else {
1233 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1234 "and modified in %s. Version %s of %s left in tree%s%s.",
1235 path, o->branch2,
1236 o->branch1, o->branch1, path,
1237 path == new_path ? "" : " at ",
1238 path == new_path ? "" : new_path);
1239 update_file(o, 0, a_sha, a_mode, new_path);
1240 }
1241 }
1243 static int merge_content(struct merge_options *o,
1244 const char *path,
1245 unsigned char *o_sha, int o_mode,
1246 unsigned char *a_sha, int a_mode,
1247 unsigned char *b_sha, int b_mode,
1248 const char *df_rename_conflict_branch)
1249 {
1250 const char *reason = "content";
1251 struct merge_file_info mfi;
1252 struct diff_filespec one, a, b;
1253 struct stat st;
1254 unsigned df_conflict_remains = 0;
1256 if (!o_sha) {
1257 reason = "add/add";
1258 o_sha = (unsigned char *)null_sha1;
1259 }
1260 one.path = a.path = b.path = (char *)path;
1261 hashcpy(one.sha1, o_sha);
1262 one.mode = o_mode;
1263 hashcpy(a.sha1, a_sha);
1264 a.mode = a_mode;
1265 hashcpy(b.sha1, b_sha);
1266 b.mode = b_mode;
1268 mfi = merge_file(o, &one, &a, &b, o->branch1, o->branch2);
1269 if (df_rename_conflict_branch &&
1270 lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1271 df_conflict_remains = 1;
1272 }
1274 if (mfi.clean && !df_conflict_remains &&
1275 sha_eq(mfi.sha, a_sha) && mfi.mode == a.mode)
1276 output(o, 3, "Skipped %s (merged same as existing)", path);
1277 else
1278 output(o, 2, "Auto-merging %s", path);
1280 if (!mfi.clean) {
1281 if (S_ISGITLINK(mfi.mode))
1282 reason = "submodule";
1283 output(o, 1, "CONFLICT (%s): Merge conflict in %s",
1284 reason, path);
1285 }
1287 if (df_conflict_remains) {
1288 const char *new_path;
1289 update_file_flags(o, mfi.sha, mfi.mode, path,
1290 o->call_depth || mfi.clean, 0);
1291 new_path = unique_path(o, path, df_rename_conflict_branch);
1292 mfi.clean = 0;
1293 output(o, 1, "Adding as %s instead", new_path);
1294 update_file_flags(o, mfi.sha, mfi.mode, new_path, 0, 1);
1295 } else {
1296 update_file(o, mfi.clean, mfi.sha, mfi.mode, path);
1297 }
1298 return mfi.clean;
1300 }
1302 /* Per entry merge function */
1303 static int process_entry(struct merge_options *o,
1304 const char *path, struct stage_data *entry)
1305 {
1306 /*
1307 printf("processing entry, clean cache: %s\n", index_only ? "yes": "no");
1308 print_index_entry("\tpath: ", entry);
1309 */
1310 int clean_merge = 1;
1311 int normalize = o->renormalize;
1312 unsigned o_mode = entry->stages[1].mode;
1313 unsigned a_mode = entry->stages[2].mode;
1314 unsigned b_mode = entry->stages[3].mode;
1315 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1316 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1317 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1319 if (entry->rename_df_conflict_info)
1320 return 1; /* Such cases are handled elsewhere. */
1322 entry->processed = 1;
1323 if (o_sha && (!a_sha || !b_sha)) {
1324 /* Case A: Deleted in one */
1325 if ((!a_sha && !b_sha) ||
1326 (!b_sha && blob_unchanged(o_sha, a_sha, normalize, path)) ||
1327 (!a_sha && blob_unchanged(o_sha, b_sha, normalize, path))) {
1328 /* Deleted in both or deleted in one and
1329 * unchanged in the other */
1330 if (a_sha)
1331 output(o, 2, "Removing %s", path);
1332 /* do not touch working file if it did not exist */
1333 remove_file(o, 1, path, !a_sha);
1334 } else if (string_list_has_string(&o->current_directory_set,
1335 path)) {
1336 entry->processed = 0;
1337 return 1; /* Assume clean until processed */
1338 } else {
1339 /* Deleted in one and changed in the other */
1340 clean_merge = 0;
1341 handle_delete_modify(o, path, path,
1342 a_sha, a_mode, b_sha, b_mode);
1343 }
1345 } else if ((!o_sha && a_sha && !b_sha) ||
1346 (!o_sha && !a_sha && b_sha)) {
1347 /* Case B: Added in one. */
1348 unsigned mode;
1349 const unsigned char *sha;
1351 if (a_sha) {
1352 mode = a_mode;
1353 sha = a_sha;
1354 } else {
1355 mode = b_mode;
1356 sha = b_sha;
1357 }
1358 if (string_list_has_string(&o->current_directory_set, path)) {
1359 /* Handle D->F conflicts after all subfiles */
1360 entry->processed = 0;
1361 return 1; /* Assume clean until processed */
1362 } else {
1363 output(o, 2, "Adding %s", path);
1364 update_file(o, 1, sha, mode, path);
1365 }
1366 } else if (a_sha && b_sha) {
1367 /* Case C: Added in both (check for same permissions) and */
1368 /* case D: Modified in both, but differently. */
1369 clean_merge = merge_content(o, path,
1370 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1371 NULL);
1372 } else if (!o_sha && !a_sha && !b_sha) {
1373 /*
1374 * this entry was deleted altogether. a_mode == 0 means
1375 * we had that path and want to actively remove it.
1376 */
1377 remove_file(o, 1, path, !a_mode);
1378 } else
1379 die("Fatal merge failure, shouldn't happen.");
1381 return clean_merge;
1382 }
1384 /*
1385 * Per entry merge function for D/F (and/or rename) conflicts. In the
1386 * cases we can cleanly resolve D/F conflicts, process_entry() can
1387 * clean out all the files below the directory for us. All D/F
1388 * conflict cases must be handled here at the end to make sure any
1389 * directories that can be cleaned out, are.
1390 *
1391 * Some rename conflicts may also be handled here that don't necessarily
1392 * involve D/F conflicts, since the code to handle them is generic enough
1393 * to handle those rename conflicts with or without D/F conflicts also
1394 * being involved.
1395 */
1396 static int process_df_entry(struct merge_options *o,
1397 const char *path, struct stage_data *entry)
1398 {
1399 int clean_merge = 1;
1400 unsigned o_mode = entry->stages[1].mode;
1401 unsigned a_mode = entry->stages[2].mode;
1402 unsigned b_mode = entry->stages[3].mode;
1403 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1404 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1405 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1406 struct stat st;
1408 entry->processed = 1;
1409 if (entry->rename_df_conflict_info) {
1410 struct rename_df_conflict_info *conflict_info = entry->rename_df_conflict_info;
1411 char *src;
1412 switch (conflict_info->rename_type) {
1413 case RENAME_NORMAL:
1414 clean_merge = merge_content(o, path,
1415 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1416 conflict_info->branch1);
1417 break;
1418 case RENAME_DELETE:
1419 clean_merge = 0;
1420 conflict_rename_delete(o, conflict_info->pair1,
1421 conflict_info->branch1,
1422 conflict_info->branch2);
1423 break;
1424 case RENAME_ONE_FILE_TO_TWO:
1425 src = conflict_info->pair1->one->path;
1426 clean_merge = 0;
1427 output(o, 1, "CONFLICT (rename/rename): "
1428 "Rename \"%s\"->\"%s\" in branch \"%s\" "
1429 "rename \"%s\"->\"%s\" in \"%s\"%s",
1430 src, conflict_info->pair1->two->path, conflict_info->branch1,
1431 src, conflict_info->pair2->two->path, conflict_info->branch2,
1432 o->call_depth ? " (left unresolved)" : "");
1433 if (o->call_depth) {
1434 remove_file_from_cache(src);
1435 update_file(o, 0, conflict_info->pair1->one->sha1,
1436 conflict_info->pair1->one->mode, src);
1437 }
1438 conflict_rename_rename_1to2(o, conflict_info->pair1,
1439 conflict_info->branch1,
1440 conflict_info->pair2,
1441 conflict_info->branch2);
1442 conflict_info->dst_entry2->processed = 1;
1443 break;
1444 default:
1445 entry->processed = 0;
1446 break;
1447 }
1448 } else if (o_sha && (!a_sha || !b_sha)) {
1449 /* Modify/delete; deleted side may have put a directory in the way */
1450 const char *new_path = path;
1451 if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode))
1452 new_path = unique_path(o, path, a_sha ? o->branch1 : o->branch2);
1453 clean_merge = 0;
1454 handle_delete_modify(o, path, new_path,
1455 a_sha, a_mode, b_sha, b_mode);
1456 } else if (!o_sha && !!a_sha != !!b_sha) {
1457 /* directory -> (directory, file) */
1458 const char *add_branch;
1459 const char *other_branch;
1460 unsigned mode;
1461 const unsigned char *sha;
1462 const char *conf;
1464 if (a_sha) {
1465 add_branch = o->branch1;
1466 other_branch = o->branch2;
1467 mode = a_mode;
1468 sha = a_sha;
1469 conf = "file/directory";
1470 } else {
1471 add_branch = o->branch2;
1472 other_branch = o->branch1;
1473 mode = b_mode;
1474 sha = b_sha;
1475 conf = "directory/file";
1476 }
1477 if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1478 const char *new_path = unique_path(o, path, add_branch);
1479 clean_merge = 0;
1480 output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. "
1481 "Adding %s as %s",
1482 conf, path, other_branch, path, new_path);
1483 update_file(o, 0, sha, mode, new_path);
1484 } else {
1485 output(o, 2, "Adding %s", path);
1486 update_file(o, 1, sha, mode, path);
1487 }
1488 } else {
1489 entry->processed = 0;
1490 return 1; /* not handled; assume clean until processed */
1491 }
1493 return clean_merge;
1494 }
1496 int merge_trees(struct merge_options *o,
1497 struct tree *head,
1498 struct tree *merge,
1499 struct tree *common,
1500 struct tree **result)
1501 {
1502 int code, clean;
1504 if (o->subtree_shift) {
1505 merge = shift_tree_object(head, merge, o->subtree_shift);
1506 common = shift_tree_object(head, common, o->subtree_shift);
1507 }
1509 if (sha_eq(common->object.sha1, merge->object.sha1)) {
1510 output(o, 0, "Already up-to-date!");
1511 *result = head;
1512 return 1;
1513 }
1515 code = git_merge_trees(o->call_depth, common, head, merge);
1517 if (code != 0) {
1518 if (show(o, 4) || o->call_depth)
1519 die("merging of trees %s and %s failed",
1520 sha1_to_hex(head->object.sha1),
1521 sha1_to_hex(merge->object.sha1));
1522 else
1523 exit(128);
1524 }
1526 if (unmerged_cache()) {
1527 struct string_list *entries, *re_head, *re_merge;
1528 int i;
1529 string_list_clear(&o->current_file_set, 1);
1530 string_list_clear(&o->current_directory_set, 1);
1531 get_files_dirs(o, head);
1532 get_files_dirs(o, merge);
1534 entries = get_unmerged();
1535 make_room_for_directories_of_df_conflicts(o, entries);
1536 re_head = get_renames(o, head, common, head, merge, entries);
1537 re_merge = get_renames(o, merge, common, head, merge, entries);
1538 clean = process_renames(o, re_head, re_merge);
1539 for (i = 0; i < entries->nr; i++) {
1540 const char *path = entries->items[i].string;
1541 struct stage_data *e = entries->items[i].util;
1542 if (!e->processed
1543 && !process_entry(o, path, e))
1544 clean = 0;
1545 }
1546 for (i = 0; i < entries->nr; i++) {
1547 const char *path = entries->items[i].string;
1548 struct stage_data *e = entries->items[i].util;
1549 if (!e->processed
1550 && !process_df_entry(o, path, e))
1551 clean = 0;
1552 }
1553 for (i = 0; i < entries->nr; i++) {
1554 struct stage_data *e = entries->items[i].util;
1555 if (!e->processed)
1556 die("Unprocessed path??? %s",
1557 entries->items[i].string);
1558 }
1560 string_list_clear(re_merge, 0);
1561 string_list_clear(re_head, 0);
1562 string_list_clear(entries, 1);
1564 }
1565 else
1566 clean = 1;
1568 if (o->call_depth)
1569 *result = write_tree_from_memory(o);
1571 return clean;
1572 }
1574 static struct commit_list *reverse_commit_list(struct commit_list *list)
1575 {
1576 struct commit_list *next = NULL, *current, *backup;
1577 for (current = list; current; current = backup) {
1578 backup = current->next;
1579 current->next = next;
1580 next = current;
1581 }
1582 return next;
1583 }
1585 /*
1586 * Merge the commits h1 and h2, return the resulting virtual
1587 * commit object and a flag indicating the cleanness of the merge.
1588 */
1589 int merge_recursive(struct merge_options *o,
1590 struct commit *h1,
1591 struct commit *h2,
1592 struct commit_list *ca,
1593 struct commit **result)
1594 {
1595 struct commit_list *iter;
1596 struct commit *merged_common_ancestors;
1597 struct tree *mrtree = mrtree;
1598 int clean;
1600 if (show(o, 4)) {
1601 output(o, 4, "Merging:");
1602 output_commit_title(o, h1);
1603 output_commit_title(o, h2);
1604 }
1606 if (!ca) {
1607 ca = get_merge_bases(h1, h2, 1);
1608 ca = reverse_commit_list(ca);
1609 }
1611 if (show(o, 5)) {
1612 output(o, 5, "found %u common ancestor(s):", commit_list_count(ca));
1613 for (iter = ca; iter; iter = iter->next)
1614 output_commit_title(o, iter->item);
1615 }
1617 merged_common_ancestors = pop_commit(&ca);
1618 if (merged_common_ancestors == NULL) {
1619 /* if there is no common ancestor, make an empty tree */
1620 struct tree *tree = xcalloc(1, sizeof(struct tree));
1622 tree->object.parsed = 1;
1623 tree->object.type = OBJ_TREE;
1624 pretend_sha1_file(NULL, 0, OBJ_TREE, tree->object.sha1);
1625 merged_common_ancestors = make_virtual_commit(tree, "ancestor");
1626 }
1628 for (iter = ca; iter; iter = iter->next) {
1629 const char *saved_b1, *saved_b2;
1630 o->call_depth++;
1631 /*
1632 * When the merge fails, the result contains files
1633 * with conflict markers. The cleanness flag is
1634 * ignored, it was never actually used, as result of
1635 * merge_trees has always overwritten it: the committed
1636 * "conflicts" were already resolved.
1637 */
1638 discard_cache();
1639 saved_b1 = o->branch1;
1640 saved_b2 = o->branch2;
1641 o->branch1 = "Temporary merge branch 1";
1642 o->branch2 = "Temporary merge branch 2";
1643 merge_recursive(o, merged_common_ancestors, iter->item,
1644 NULL, &merged_common_ancestors);
1645 o->branch1 = saved_b1;
1646 o->branch2 = saved_b2;
1647 o->call_depth--;
1649 if (!merged_common_ancestors)
1650 die("merge returned no commit");
1651 }
1653 discard_cache();
1654 if (!o->call_depth)
1655 read_cache();
1657 o->ancestor = "merged common ancestors";
1658 clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
1659 &mrtree);
1661 if (o->call_depth) {
1662 *result = make_virtual_commit(mrtree, "merged tree");
1663 commit_list_insert(h1, &(*result)->parents);
1664 commit_list_insert(h2, &(*result)->parents->next);
1665 }
1666 flush_output(o);
1667 return clean;
1668 }
1670 static struct commit *get_ref(const unsigned char *sha1, const char *name)
1671 {
1672 struct object *object;
1674 object = deref_tag(parse_object(sha1), name, strlen(name));
1675 if (!object)
1676 return NULL;
1677 if (object->type == OBJ_TREE)
1678 return make_virtual_commit((struct tree*)object, name);
1679 if (object->type != OBJ_COMMIT)
1680 return NULL;
1681 if (parse_commit((struct commit *)object))
1682 return NULL;
1683 return (struct commit *)object;
1684 }
1686 int merge_recursive_generic(struct merge_options *o,
1687 const unsigned char *head,
1688 const unsigned char *merge,
1689 int num_base_list,
1690 const unsigned char **base_list,
1691 struct commit **result)
1692 {
1693 int clean, index_fd;
1694 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
1695 struct commit *head_commit = get_ref(head, o->branch1);
1696 struct commit *next_commit = get_ref(merge, o->branch2);
1697 struct commit_list *ca = NULL;
1699 if (base_list) {
1700 int i;
1701 for (i = 0; i < num_base_list; ++i) {
1702 struct commit *base;
1703 if (!(base = get_ref(base_list[i], sha1_to_hex(base_list[i]))))
1704 return error("Could not parse object '%s'",
1705 sha1_to_hex(base_list[i]));
1706 commit_list_insert(base, &ca);
1707 }
1708 }
1710 index_fd = hold_locked_index(lock, 1);
1711 clean = merge_recursive(o, head_commit, next_commit, ca,
1712 result);
1713 if (active_cache_changed &&
1714 (write_cache(index_fd, active_cache, active_nr) ||
1715 commit_locked_index(lock)))
1716 return error("Unable to write index.");
1718 return clean ? 0 : 1;
1719 }
1721 static int merge_recursive_config(const char *var, const char *value, void *cb)
1722 {
1723 struct merge_options *o = cb;
1724 if (!strcasecmp(var, "merge.verbosity")) {
1725 o->verbosity = git_config_int(var, value);
1726 return 0;
1727 }
1728 if (!strcasecmp(var, "diff.renamelimit")) {
1729 o->diff_rename_limit = git_config_int(var, value);
1730 return 0;
1731 }
1732 if (!strcasecmp(var, "merge.renamelimit")) {
1733 o->merge_rename_limit = git_config_int(var, value);
1734 return 0;
1735 }
1736 return git_xmerge_config(var, value, cb);
1737 }
1739 void init_merge_options(struct merge_options *o)
1740 {
1741 memset(o, 0, sizeof(struct merge_options));
1742 o->verbosity = 2;
1743 o->buffer_output = 1;
1744 o->diff_rename_limit = -1;
1745 o->merge_rename_limit = -1;
1746 o->renormalize = 0;
1747 git_config(merge_recursive_config, o);
1748 if (getenv("GIT_MERGE_VERBOSITY"))
1749 o->verbosity =
1750 strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10);
1751 if (o->verbosity >= 5)
1752 o->buffer_output = 0;
1753 strbuf_init(&o->obuf, 0);
1754 memset(&o->current_file_set, 0, sizeof(struct string_list));
1755 o->current_file_set.strdup_strings = 1;
1756 memset(&o->current_directory_set, 0, sizeof(struct string_list));
1757 o->current_directory_set.strdup_strings = 1;
1758 }