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