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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 const char rename_limit_advice[] =
26 "inexact rename detection was skipped because there were too many\n"
27 " files. You may want to set your merge.renamelimit variable to at least\n"
28 " %d and retry this merge.";
30 static struct tree *shift_tree_object(struct tree *one, struct tree *two,
31 const char *subtree_shift)
32 {
33 unsigned char shifted[20];
35 if (!*subtree_shift) {
36 shift_tree(one->object.sha1, two->object.sha1, shifted, 0);
37 } else {
38 shift_tree_by(one->object.sha1, two->object.sha1, shifted,
39 subtree_shift);
40 }
41 if (!hashcmp(two->object.sha1, shifted))
42 return two;
43 return lookup_tree(shifted);
44 }
46 /*
47 * A virtual commit has (const char *)commit->util set to the name.
48 */
50 static struct commit *make_virtual_commit(struct tree *tree, const char *comment)
51 {
52 struct commit *commit = xcalloc(1, sizeof(struct commit));
53 commit->tree = tree;
54 commit->util = (void*)comment;
55 /* avoid warnings */
56 commit->object.parsed = 1;
57 return commit;
58 }
60 /*
61 * Since we use get_tree_entry(), which does not put the read object into
62 * the object pool, we cannot rely on a == b.
63 */
64 static int sha_eq(const unsigned char *a, const unsigned char *b)
65 {
66 if (!a && !b)
67 return 2;
68 return a && b && hashcmp(a, b) == 0;
69 }
71 enum rename_type {
72 RENAME_NORMAL = 0,
73 RENAME_DELETE,
74 RENAME_ONE_FILE_TO_TWO
75 };
77 struct rename_df_conflict_info {
78 enum rename_type rename_type;
79 struct diff_filepair *pair1;
80 struct diff_filepair *pair2;
81 const char *branch1;
82 const char *branch2;
83 struct stage_data *dst_entry1;
84 struct stage_data *dst_entry2;
85 };
87 /*
88 * Since we want to write the index eventually, we cannot reuse the index
89 * for these (temporary) data.
90 */
91 struct stage_data
92 {
93 struct
94 {
95 unsigned mode;
96 unsigned char sha[20];
97 } stages[4];
98 struct rename_df_conflict_info *rename_df_conflict_info;
99 unsigned processed:1;
100 };
102 static inline void setup_rename_df_conflict_info(enum rename_type rename_type,
103 struct diff_filepair *pair1,
104 struct diff_filepair *pair2,
105 const char *branch1,
106 const char *branch2,
107 struct stage_data *dst_entry1,
108 struct stage_data *dst_entry2)
109 {
110 struct rename_df_conflict_info *ci = xcalloc(1, sizeof(struct rename_df_conflict_info));
111 ci->rename_type = rename_type;
112 ci->pair1 = pair1;
113 ci->branch1 = branch1;
114 ci->branch2 = branch2;
116 ci->dst_entry1 = dst_entry1;
117 dst_entry1->rename_df_conflict_info = ci;
118 dst_entry1->processed = 0;
120 assert(!pair2 == !dst_entry2);
121 if (dst_entry2) {
122 ci->dst_entry2 = dst_entry2;
123 ci->pair2 = pair2;
124 dst_entry2->rename_df_conflict_info = ci;
125 dst_entry2->processed = 0;
126 }
127 }
129 static int show(struct merge_options *o, int v)
130 {
131 return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5;
132 }
134 static void flush_output(struct merge_options *o)
135 {
136 if (o->obuf.len) {
137 fputs(o->obuf.buf, stdout);
138 strbuf_reset(&o->obuf);
139 }
140 }
142 __attribute__((format (printf, 3, 4)))
143 static void output(struct merge_options *o, int v, const char *fmt, ...)
144 {
145 int len;
146 va_list ap;
148 if (!show(o, v))
149 return;
151 strbuf_grow(&o->obuf, o->call_depth * 2 + 2);
152 memset(o->obuf.buf + o->obuf.len, ' ', o->call_depth * 2);
153 strbuf_setlen(&o->obuf, o->obuf.len + o->call_depth * 2);
155 va_start(ap, fmt);
156 len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap);
157 va_end(ap);
159 if (len < 0)
160 len = 0;
161 if (len >= strbuf_avail(&o->obuf)) {
162 strbuf_grow(&o->obuf, len + 2);
163 va_start(ap, fmt);
164 len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap);
165 va_end(ap);
166 if (len >= strbuf_avail(&o->obuf)) {
167 die("this should not happen, your snprintf is broken");
168 }
169 }
170 strbuf_setlen(&o->obuf, o->obuf.len + len);
171 strbuf_add(&o->obuf, "\n", 1);
172 if (!o->buffer_output)
173 flush_output(o);
174 }
176 static void output_commit_title(struct merge_options *o, struct commit *commit)
177 {
178 int i;
179 flush_output(o);
180 for (i = o->call_depth; i--;)
181 fputs(" ", stdout);
182 if (commit->util)
183 printf("virtual %s\n", (char *)commit->util);
184 else {
185 printf("%s ", find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV));
186 if (parse_commit(commit) != 0)
187 printf("(bad commit)\n");
188 else {
189 const char *title;
190 int len = find_commit_subject(commit->buffer, &title);
191 if (len)
192 printf("%.*s\n", len, title);
193 }
194 }
195 }
197 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
198 const char *path, int stage, int refresh, int options)
199 {
200 struct cache_entry *ce;
201 ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage, refresh);
202 if (!ce)
203 return error("addinfo_cache failed for path '%s'", path);
204 return add_cache_entry(ce, options);
205 }
207 static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree)
208 {
209 parse_tree(tree);
210 init_tree_desc(desc, tree->buffer, tree->size);
211 }
213 static int git_merge_trees(int index_only,
214 struct tree *common,
215 struct tree *head,
216 struct tree *merge)
217 {
218 int rc;
219 struct tree_desc t[3];
220 struct unpack_trees_options opts;
222 memset(&opts, 0, sizeof(opts));
223 if (index_only)
224 opts.index_only = 1;
225 else
226 opts.update = 1;
227 opts.merge = 1;
228 opts.head_idx = 2;
229 opts.fn = threeway_merge;
230 opts.src_index = &the_index;
231 opts.dst_index = &the_index;
232 setup_unpack_trees_porcelain(&opts, "merge");
234 init_tree_desc_from_tree(t+0, common);
235 init_tree_desc_from_tree(t+1, head);
236 init_tree_desc_from_tree(t+2, merge);
238 rc = unpack_trees(3, t, &opts);
239 cache_tree_free(&active_cache_tree);
240 return rc;
241 }
243 struct tree *write_tree_from_memory(struct merge_options *o)
244 {
245 struct tree *result = NULL;
247 if (unmerged_cache()) {
248 int i;
249 fprintf(stderr, "BUG: There are unmerged index entries:\n");
250 for (i = 0; i < active_nr; i++) {
251 struct cache_entry *ce = active_cache[i];
252 if (ce_stage(ce))
253 fprintf(stderr, "BUG: %d %.*s", ce_stage(ce),
254 (int)ce_namelen(ce), ce->name);
255 }
256 die("Bug in merge-recursive.c");
257 }
259 if (!active_cache_tree)
260 active_cache_tree = cache_tree();
262 if (!cache_tree_fully_valid(active_cache_tree) &&
263 cache_tree_update(active_cache_tree,
264 active_cache, active_nr, 0, 0) < 0)
265 die("error building trees");
267 result = lookup_tree(active_cache_tree->sha1);
269 return result;
270 }
272 static int save_files_dirs(const unsigned char *sha1,
273 const char *base, int baselen, const char *path,
274 unsigned int mode, int stage, void *context)
275 {
276 int len = strlen(path);
277 char *newpath = xmalloc(baselen + len + 1);
278 struct merge_options *o = context;
280 memcpy(newpath, base, baselen);
281 memcpy(newpath + baselen, path, len);
282 newpath[baselen + len] = '\0';
284 if (S_ISDIR(mode))
285 string_list_insert(&o->current_directory_set, newpath);
286 else
287 string_list_insert(&o->current_file_set, newpath);
288 free(newpath);
290 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
291 }
293 static int get_files_dirs(struct merge_options *o, struct tree *tree)
294 {
295 int n;
296 if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs, o))
297 return 0;
298 n = o->current_file_set.nr + o->current_directory_set.nr;
299 return n;
300 }
302 /*
303 * Returns an index_entry instance which doesn't have to correspond to
304 * a real cache entry in Git's index.
305 */
306 static struct stage_data *insert_stage_data(const char *path,
307 struct tree *o, struct tree *a, struct tree *b,
308 struct string_list *entries)
309 {
310 struct string_list_item *item;
311 struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
312 get_tree_entry(o->object.sha1, path,
313 e->stages[1].sha, &e->stages[1].mode);
314 get_tree_entry(a->object.sha1, path,
315 e->stages[2].sha, &e->stages[2].mode);
316 get_tree_entry(b->object.sha1, path,
317 e->stages[3].sha, &e->stages[3].mode);
318 item = string_list_insert(entries, path);
319 item->util = e;
320 return e;
321 }
323 /*
324 * Create a dictionary mapping file names to stage_data objects. The
325 * dictionary contains one entry for every path with a non-zero stage entry.
326 */
327 static struct string_list *get_unmerged(void)
328 {
329 struct string_list *unmerged = xcalloc(1, sizeof(struct string_list));
330 int i;
332 unmerged->strdup_strings = 1;
334 for (i = 0; i < active_nr; i++) {
335 struct string_list_item *item;
336 struct stage_data *e;
337 struct cache_entry *ce = active_cache[i];
338 if (!ce_stage(ce))
339 continue;
341 item = string_list_lookup(unmerged, ce->name);
342 if (!item) {
343 item = string_list_insert(unmerged, ce->name);
344 item->util = xcalloc(1, sizeof(struct stage_data));
345 }
346 e = item->util;
347 e->stages[ce_stage(ce)].mode = ce->ce_mode;
348 hashcpy(e->stages[ce_stage(ce)].sha, ce->sha1);
349 }
351 return unmerged;
352 }
354 static void make_room_for_directories_of_df_conflicts(struct merge_options *o,
355 struct string_list *entries)
356 {
357 /* If there are D/F conflicts, and the paths currently exist
358 * in the working copy as a file, we want to remove them to
359 * make room for the corresponding directory. Such paths will
360 * later be processed in process_df_entry() at the end. If
361 * the corresponding directory ends up being removed by the
362 * merge, then the file will be reinstated at that time;
363 * otherwise, if the file is not supposed to be removed by the
364 * merge, the contents of the file will be placed in another
365 * unique filename.
366 *
367 * NOTE: This function relies on the fact that entries for a
368 * D/F conflict will appear adjacent in the index, with the
369 * entries for the file appearing before entries for paths
370 * below the corresponding directory.
371 */
372 const char *last_file = NULL;
373 int last_len = 0;
374 struct stage_data *last_e;
375 int i;
377 for (i = 0; i < entries->nr; i++) {
378 const char *path = entries->items[i].string;
379 int len = strlen(path);
380 struct stage_data *e = entries->items[i].util;
382 /*
383 * Check if last_file & path correspond to a D/F conflict;
384 * i.e. whether path is last_file+'/'+<something>.
385 * If so, remove last_file to make room for path and friends.
386 */
387 if (last_file &&
388 len > last_len &&
389 memcmp(path, last_file, last_len) == 0 &&
390 path[last_len] == '/') {
391 output(o, 3, "Removing %s to make room for subdirectory; may re-add later.", last_file);
392 unlink(last_file);
393 }
395 /*
396 * Determine whether path could exist as a file in the
397 * working directory as a possible D/F conflict. This
398 * will only occur when it exists in stage 2 as a
399 * file.
400 */
401 if (S_ISREG(e->stages[2].mode) || S_ISLNK(e->stages[2].mode)) {
402 last_file = path;
403 last_len = len;
404 last_e = e;
405 } else {
406 last_file = NULL;
407 }
408 }
409 }
411 struct rename
412 {
413 struct diff_filepair *pair;
414 struct stage_data *src_entry;
415 struct stage_data *dst_entry;
416 unsigned processed:1;
417 };
419 /*
420 * Get information of all renames which occurred between 'o_tree' and
421 * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
422 * 'b_tree') to be able to associate the correct cache entries with
423 * the rename information. 'tree' is always equal to either a_tree or b_tree.
424 */
425 static struct string_list *get_renames(struct merge_options *o,
426 struct tree *tree,
427 struct tree *o_tree,
428 struct tree *a_tree,
429 struct tree *b_tree,
430 struct string_list *entries)
431 {
432 int i;
433 struct string_list *renames;
434 struct diff_options opts;
436 renames = xcalloc(1, sizeof(struct string_list));
437 diff_setup(&opts);
438 DIFF_OPT_SET(&opts, RECURSIVE);
439 opts.detect_rename = DIFF_DETECT_RENAME;
440 opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
441 o->diff_rename_limit >= 0 ? o->diff_rename_limit :
442 1000;
443 opts.rename_score = o->rename_score;
444 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
445 if (diff_setup_done(&opts) < 0)
446 die("diff setup failed");
447 diff_tree_sha1(o_tree->object.sha1, tree->object.sha1, "", &opts);
448 diffcore_std(&opts);
449 if (opts.needed_rename_limit > o->needed_rename_limit)
450 o->needed_rename_limit = opts.needed_rename_limit;
451 for (i = 0; i < diff_queued_diff.nr; ++i) {
452 struct string_list_item *item;
453 struct rename *re;
454 struct diff_filepair *pair = diff_queued_diff.queue[i];
455 if (pair->status != 'R') {
456 diff_free_filepair(pair);
457 continue;
458 }
459 re = xmalloc(sizeof(*re));
460 re->processed = 0;
461 re->pair = pair;
462 item = string_list_lookup(entries, re->pair->one->path);
463 if (!item)
464 re->src_entry = insert_stage_data(re->pair->one->path,
465 o_tree, a_tree, b_tree, entries);
466 else
467 re->src_entry = item->util;
469 item = string_list_lookup(entries, re->pair->two->path);
470 if (!item)
471 re->dst_entry = insert_stage_data(re->pair->two->path,
472 o_tree, a_tree, b_tree, entries);
473 else
474 re->dst_entry = item->util;
475 item = string_list_insert(renames, pair->one->path);
476 item->util = re;
477 }
478 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
479 diff_queued_diff.nr = 0;
480 diff_flush(&opts);
481 return renames;
482 }
484 static int update_stages_options(const char *path, struct diff_filespec *o,
485 struct diff_filespec *a, struct diff_filespec *b,
486 int clear, int options)
487 {
488 if (clear)
489 if (remove_file_from_cache(path))
490 return -1;
491 if (o)
492 if (add_cacheinfo(o->mode, o->sha1, path, 1, 0, options))
493 return -1;
494 if (a)
495 if (add_cacheinfo(a->mode, a->sha1, path, 2, 0, options))
496 return -1;
497 if (b)
498 if (add_cacheinfo(b->mode, b->sha1, path, 3, 0, options))
499 return -1;
500 return 0;
501 }
503 static int update_stages(const char *path, struct diff_filespec *o,
504 struct diff_filespec *a, struct diff_filespec *b,
505 int clear)
506 {
507 int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE;
508 return update_stages_options(path, o, a, b, clear, options);
509 }
511 static int update_stages_and_entry(const char *path,
512 struct stage_data *entry,
513 struct diff_filespec *o,
514 struct diff_filespec *a,
515 struct diff_filespec *b,
516 int clear)
517 {
518 int options;
520 entry->processed = 0;
521 entry->stages[1].mode = o->mode;
522 entry->stages[2].mode = a->mode;
523 entry->stages[3].mode = b->mode;
524 hashcpy(entry->stages[1].sha, o->sha1);
525 hashcpy(entry->stages[2].sha, a->sha1);
526 hashcpy(entry->stages[3].sha, b->sha1);
527 options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_SKIP_DFCHECK;
528 return update_stages_options(path, o, a, b, clear, options);
529 }
531 static int remove_file(struct merge_options *o, int clean,
532 const char *path, int no_wd)
533 {
534 int update_cache = o->call_depth || clean;
535 int update_working_directory = !o->call_depth && !no_wd;
537 if (update_cache) {
538 if (remove_file_from_cache(path))
539 return -1;
540 }
541 if (update_working_directory) {
542 if (remove_path(path))
543 return -1;
544 }
545 return 0;
546 }
548 static char *unique_path(struct merge_options *o, const char *path, const char *branch)
549 {
550 char *newpath = xmalloc(strlen(path) + 1 + strlen(branch) + 8 + 1);
551 int suffix = 0;
552 struct stat st;
553 char *p = newpath + strlen(path);
554 strcpy(newpath, path);
555 *(p++) = '~';
556 strcpy(p, branch);
557 for (; *p; ++p)
558 if ('/' == *p)
559 *p = '_';
560 while (string_list_has_string(&o->current_file_set, newpath) ||
561 string_list_has_string(&o->current_directory_set, newpath) ||
562 lstat(newpath, &st) == 0)
563 sprintf(p, "_%d", suffix++);
565 string_list_insert(&o->current_file_set, newpath);
566 return newpath;
567 }
569 static void flush_buffer(int fd, const char *buf, unsigned long size)
570 {
571 while (size > 0) {
572 long ret = write_in_full(fd, buf, size);
573 if (ret < 0) {
574 /* Ignore epipe */
575 if (errno == EPIPE)
576 break;
577 die_errno("merge-recursive");
578 } else if (!ret) {
579 die("merge-recursive: disk full?");
580 }
581 size -= ret;
582 buf += ret;
583 }
584 }
586 static int would_lose_untracked(const char *path)
587 {
588 int pos = cache_name_pos(path, strlen(path));
590 if (pos < 0)
591 pos = -1 - pos;
592 while (pos < active_nr &&
593 !strcmp(path, active_cache[pos]->name)) {
594 /*
595 * If stage #0, it is definitely tracked.
596 * If it has stage #2 then it was tracked
597 * before this merge started. All other
598 * cases the path was not tracked.
599 */
600 switch (ce_stage(active_cache[pos])) {
601 case 0:
602 case 2:
603 return 0;
604 }
605 pos++;
606 }
607 return file_exists(path);
608 }
610 static int make_room_for_path(const char *path)
611 {
612 int status;
613 const char *msg = "failed to create path '%s'%s";
615 status = safe_create_leading_directories_const(path);
616 if (status) {
617 if (status == -3) {
618 /* something else exists */
619 error(msg, path, ": perhaps a D/F conflict?");
620 return -1;
621 }
622 die(msg, path, "");
623 }
625 /*
626 * Do not unlink a file in the work tree if we are not
627 * tracking it.
628 */
629 if (would_lose_untracked(path))
630 return error("refusing to lose untracked file at '%s'",
631 path);
633 /* Successful unlink is good.. */
634 if (!unlink(path))
635 return 0;
636 /* .. and so is no existing file */
637 if (errno == ENOENT)
638 return 0;
639 /* .. but not some other error (who really cares what?) */
640 return error(msg, path, ": perhaps a D/F conflict?");
641 }
643 static void update_file_flags(struct merge_options *o,
644 const unsigned char *sha,
645 unsigned mode,
646 const char *path,
647 int update_cache,
648 int update_wd)
649 {
650 if (o->call_depth)
651 update_wd = 0;
653 if (update_wd) {
654 enum object_type type;
655 void *buf;
656 unsigned long size;
658 if (S_ISGITLINK(mode)) {
659 /*
660 * We may later decide to recursively descend into
661 * the submodule directory and update its index
662 * and/or work tree, but we do not do that now.
663 */
664 update_wd = 0;
665 goto update_index;
666 }
668 buf = read_sha1_file(sha, &type, &size);
669 if (!buf)
670 die("cannot read object %s '%s'", sha1_to_hex(sha), path);
671 if (type != OBJ_BLOB)
672 die("blob expected for %s '%s'", sha1_to_hex(sha), path);
673 if (S_ISREG(mode)) {
674 struct strbuf strbuf = STRBUF_INIT;
675 if (convert_to_working_tree(path, buf, size, &strbuf)) {
676 free(buf);
677 size = strbuf.len;
678 buf = strbuf_detach(&strbuf, NULL);
679 }
680 }
682 if (make_room_for_path(path) < 0) {
683 update_wd = 0;
684 free(buf);
685 goto update_index;
686 }
687 if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
688 int fd;
689 if (mode & 0100)
690 mode = 0777;
691 else
692 mode = 0666;
693 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
694 if (fd < 0)
695 die_errno("failed to open '%s'", path);
696 flush_buffer(fd, buf, size);
697 close(fd);
698 } else if (S_ISLNK(mode)) {
699 char *lnk = xmemdupz(buf, size);
700 safe_create_leading_directories_const(path);
701 unlink(path);
702 if (symlink(lnk, path))
703 die_errno("failed to symlink '%s'", path);
704 free(lnk);
705 } else
706 die("do not know what to do with %06o %s '%s'",
707 mode, sha1_to_hex(sha), path);
708 free(buf);
709 }
710 update_index:
711 if (update_cache)
712 add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
713 }
715 static void update_file(struct merge_options *o,
716 int clean,
717 const unsigned char *sha,
718 unsigned mode,
719 const char *path)
720 {
721 update_file_flags(o, sha, mode, path, o->call_depth || clean, !o->call_depth);
722 }
724 /* Low level file merging, update and removal */
726 struct merge_file_info
727 {
728 unsigned char sha[20];
729 unsigned mode;
730 unsigned clean:1,
731 merge:1;
732 };
734 static int merge_3way(struct merge_options *o,
735 mmbuffer_t *result_buf,
736 struct diff_filespec *one,
737 struct diff_filespec *a,
738 struct diff_filespec *b,
739 const char *branch1,
740 const char *branch2)
741 {
742 mmfile_t orig, src1, src2;
743 struct ll_merge_options ll_opts = {0};
744 char *base_name, *name1, *name2;
745 int merge_status;
747 ll_opts.renormalize = o->renormalize;
748 ll_opts.xdl_opts = o->xdl_opts;
750 if (o->call_depth) {
751 ll_opts.virtual_ancestor = 1;
752 ll_opts.variant = 0;
753 } else {
754 switch (o->recursive_variant) {
755 case MERGE_RECURSIVE_OURS:
756 ll_opts.variant = XDL_MERGE_FAVOR_OURS;
757 break;
758 case MERGE_RECURSIVE_THEIRS:
759 ll_opts.variant = XDL_MERGE_FAVOR_THEIRS;
760 break;
761 default:
762 ll_opts.variant = 0;
763 break;
764 }
765 }
767 if (strcmp(a->path, b->path) ||
768 (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) {
769 base_name = o->ancestor == NULL ? NULL :
770 xstrdup(mkpath("%s:%s", o->ancestor, one->path));
771 name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
772 name2 = xstrdup(mkpath("%s:%s", branch2, b->path));
773 } else {
774 base_name = o->ancestor == NULL ? NULL :
775 xstrdup(mkpath("%s", o->ancestor));
776 name1 = xstrdup(mkpath("%s", branch1));
777 name2 = xstrdup(mkpath("%s", branch2));
778 }
780 read_mmblob(&orig, one->sha1);
781 read_mmblob(&src1, a->sha1);
782 read_mmblob(&src2, b->sha1);
784 merge_status = ll_merge(result_buf, a->path, &orig, base_name,
785 &src1, name1, &src2, name2, &ll_opts);
787 free(name1);
788 free(name2);
789 free(orig.ptr);
790 free(src1.ptr);
791 free(src2.ptr);
792 return merge_status;
793 }
795 static struct merge_file_info merge_file(struct merge_options *o,
796 struct diff_filespec *one,
797 struct diff_filespec *a,
798 struct diff_filespec *b,
799 const char *branch1,
800 const char *branch2)
801 {
802 struct merge_file_info result;
803 result.merge = 0;
804 result.clean = 1;
806 if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) {
807 result.clean = 0;
808 if (S_ISREG(a->mode)) {
809 result.mode = a->mode;
810 hashcpy(result.sha, a->sha1);
811 } else {
812 result.mode = b->mode;
813 hashcpy(result.sha, b->sha1);
814 }
815 } else {
816 if (!sha_eq(a->sha1, one->sha1) && !sha_eq(b->sha1, one->sha1))
817 result.merge = 1;
819 /*
820 * Merge modes
821 */
822 if (a->mode == b->mode || a->mode == one->mode)
823 result.mode = b->mode;
824 else {
825 result.mode = a->mode;
826 if (b->mode != one->mode) {
827 result.clean = 0;
828 result.merge = 1;
829 }
830 }
832 if (sha_eq(a->sha1, b->sha1) || sha_eq(a->sha1, one->sha1))
833 hashcpy(result.sha, b->sha1);
834 else if (sha_eq(b->sha1, one->sha1))
835 hashcpy(result.sha, a->sha1);
836 else if (S_ISREG(a->mode)) {
837 mmbuffer_t result_buf;
838 int merge_status;
840 merge_status = merge_3way(o, &result_buf, one, a, b,
841 branch1, branch2);
843 if ((merge_status < 0) || !result_buf.ptr)
844 die("Failed to execute internal merge");
846 if (write_sha1_file(result_buf.ptr, result_buf.size,
847 blob_type, result.sha))
848 die("Unable to add %s to database",
849 a->path);
851 free(result_buf.ptr);
852 result.clean = (merge_status == 0);
853 } else if (S_ISGITLINK(a->mode)) {
854 result.clean = merge_submodule(result.sha, one->path, one->sha1,
855 a->sha1, b->sha1);
856 } else if (S_ISLNK(a->mode)) {
857 hashcpy(result.sha, a->sha1);
859 if (!sha_eq(a->sha1, b->sha1))
860 result.clean = 0;
861 } else {
862 die("unsupported object type in the tree");
863 }
864 }
866 return result;
867 }
869 static void conflict_rename_delete(struct merge_options *o,
870 struct diff_filepair *pair,
871 const char *rename_branch,
872 const char *other_branch)
873 {
874 char *dest_name = pair->two->path;
875 int df_conflict = 0;
876 struct stat st;
878 output(o, 1, "CONFLICT (rename/delete): Rename %s->%s in %s "
879 "and deleted in %s",
880 pair->one->path, pair->two->path, rename_branch,
881 other_branch);
882 if (!o->call_depth)
883 update_stages(dest_name, NULL,
884 rename_branch == o->branch1 ? pair->two : NULL,
885 rename_branch == o->branch1 ? NULL : pair->two,
886 1);
887 if (lstat(dest_name, &st) == 0 && S_ISDIR(st.st_mode)) {
888 dest_name = unique_path(o, dest_name, rename_branch);
889 df_conflict = 1;
890 }
891 update_file(o, 0, pair->two->sha1, pair->two->mode, dest_name);
892 if (df_conflict)
893 free(dest_name);
894 }
896 static void conflict_rename_rename_1to2(struct merge_options *o,
897 struct diff_filepair *pair1,
898 const char *branch1,
899 struct diff_filepair *pair2,
900 const char *branch2)
901 {
902 /* One file was renamed in both branches, but to different names. */
903 char *del[2];
904 int delp = 0;
905 const char *ren1_dst = pair1->two->path;
906 const char *ren2_dst = pair2->two->path;
907 const char *dst_name1 = ren1_dst;
908 const char *dst_name2 = ren2_dst;
909 struct stat st;
910 if (lstat(ren1_dst, &st) == 0 && S_ISDIR(st.st_mode)) {
911 dst_name1 = del[delp++] = unique_path(o, ren1_dst, branch1);
912 output(o, 1, "%s is a directory in %s adding as %s instead",
913 ren1_dst, branch2, dst_name1);
914 }
915 if (lstat(ren2_dst, &st) == 0 && S_ISDIR(st.st_mode)) {
916 dst_name2 = del[delp++] = unique_path(o, ren2_dst, branch2);
917 output(o, 1, "%s is a directory in %s adding as %s instead",
918 ren2_dst, branch1, dst_name2);
919 }
920 if (o->call_depth) {
921 remove_file_from_cache(dst_name1);
922 remove_file_from_cache(dst_name2);
923 /*
924 * Uncomment to leave the conflicting names in the resulting tree
925 *
926 * update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1);
927 * update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2);
928 */
929 } else {
930 update_stages(ren1_dst, NULL, pair1->two, NULL, 1);
931 update_stages(ren2_dst, NULL, NULL, pair2->two, 1);
933 update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1);
934 update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2);
935 }
936 while (delp--)
937 free(del[delp]);
938 }
940 static void conflict_rename_rename_2to1(struct merge_options *o,
941 struct rename *ren1,
942 const char *branch1,
943 struct rename *ren2,
944 const char *branch2)
945 {
946 /* Two files were renamed to the same thing. */
947 char *new_path1 = unique_path(o, ren1->pair->two->path, branch1);
948 char *new_path2 = unique_path(o, ren2->pair->two->path, branch2);
949 output(o, 1, "Renaming %s to %s and %s to %s instead",
950 ren1->pair->one->path, new_path1,
951 ren2->pair->one->path, new_path2);
952 remove_file(o, 0, ren1->pair->two->path, 0);
953 update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path1);
954 update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, new_path2);
955 free(new_path2);
956 free(new_path1);
957 }
959 static int process_renames(struct merge_options *o,
960 struct string_list *a_renames,
961 struct string_list *b_renames)
962 {
963 int clean_merge = 1, i, j;
964 struct string_list a_by_dst = STRING_LIST_INIT_NODUP;
965 struct string_list b_by_dst = STRING_LIST_INIT_NODUP;
966 const struct rename *sre;
968 for (i = 0; i < a_renames->nr; i++) {
969 sre = a_renames->items[i].util;
970 string_list_insert(&a_by_dst, sre->pair->two->path)->util
971 = sre->dst_entry;
972 }
973 for (i = 0; i < b_renames->nr; i++) {
974 sre = b_renames->items[i].util;
975 string_list_insert(&b_by_dst, sre->pair->two->path)->util
976 = sre->dst_entry;
977 }
979 for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
980 char *src;
981 struct string_list *renames1, *renames2Dst;
982 struct rename *ren1 = NULL, *ren2 = NULL;
983 const char *branch1, *branch2;
984 const char *ren1_src, *ren1_dst;
986 if (i >= a_renames->nr) {
987 ren2 = b_renames->items[j++].util;
988 } else if (j >= b_renames->nr) {
989 ren1 = a_renames->items[i++].util;
990 } else {
991 int compare = strcmp(a_renames->items[i].string,
992 b_renames->items[j].string);
993 if (compare <= 0)
994 ren1 = a_renames->items[i++].util;
995 if (compare >= 0)
996 ren2 = b_renames->items[j++].util;
997 }
999 /* TODO: refactor, so that 1/2 are not needed */
1000 if (ren1) {
1001 renames1 = a_renames;
1002 renames2Dst = &b_by_dst;
1003 branch1 = o->branch1;
1004 branch2 = o->branch2;
1005 } else {
1006 struct rename *tmp;
1007 renames1 = b_renames;
1008 renames2Dst = &a_by_dst;
1009 branch1 = o->branch2;
1010 branch2 = o->branch1;
1011 tmp = ren2;
1012 ren2 = ren1;
1013 ren1 = tmp;
1014 }
1015 src = ren1->pair->one->path;
1017 ren1->dst_entry->processed = 1;
1018 ren1->src_entry->processed = 1;
1020 if (ren1->processed)
1021 continue;
1022 ren1->processed = 1;
1024 ren1_src = ren1->pair->one->path;
1025 ren1_dst = ren1->pair->two->path;
1027 if (ren2) {
1028 const char *ren2_src = ren2->pair->one->path;
1029 const char *ren2_dst = ren2->pair->two->path;
1030 /* Renamed in 1 and renamed in 2 */
1031 if (strcmp(ren1_src, ren2_src) != 0)
1032 die("ren1.src != ren2.src");
1033 ren2->dst_entry->processed = 1;
1034 ren2->processed = 1;
1035 if (strcmp(ren1_dst, ren2_dst) != 0) {
1036 setup_rename_df_conflict_info(RENAME_ONE_FILE_TO_TWO,
1037 ren1->pair,
1038 ren2->pair,
1039 branch1,
1040 branch2,
1041 ren1->dst_entry,
1042 ren2->dst_entry);
1043 } else {
1044 remove_file(o, 1, ren1_src, 1);
1045 update_stages_and_entry(ren1_dst,
1046 ren1->dst_entry,
1047 ren1->pair->one,
1048 ren1->pair->two,
1049 ren2->pair->two,
1050 1 /* clear */);
1051 }
1052 } else {
1053 /* Renamed in 1, maybe changed in 2 */
1054 struct string_list_item *item;
1055 /* we only use sha1 and mode of these */
1056 struct diff_filespec src_other, dst_other;
1057 int try_merge;
1059 /*
1060 * unpack_trees loads entries from common-commit
1061 * into stage 1, from head-commit into stage 2, and
1062 * from merge-commit into stage 3. We keep track
1063 * of which side corresponds to the rename.
1064 */
1065 int renamed_stage = a_renames == renames1 ? 2 : 3;
1066 int other_stage = a_renames == renames1 ? 3 : 2;
1068 remove_file(o, 1, ren1_src, o->call_depth || renamed_stage == 2);
1070 hashcpy(src_other.sha1, ren1->src_entry->stages[other_stage].sha);
1071 src_other.mode = ren1->src_entry->stages[other_stage].mode;
1072 hashcpy(dst_other.sha1, ren1->dst_entry->stages[other_stage].sha);
1073 dst_other.mode = ren1->dst_entry->stages[other_stage].mode;
1074 try_merge = 0;
1076 if (sha_eq(src_other.sha1, null_sha1)) {
1077 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
1078 ren1->dst_entry->processed = 0;
1079 setup_rename_df_conflict_info(RENAME_DELETE,
1080 ren1->pair,
1081 NULL,
1082 branch1,
1083 branch2,
1084 ren1->dst_entry,
1085 NULL);
1086 } else {
1087 clean_merge = 0;
1088 conflict_rename_delete(o, ren1->pair, branch1, branch2);
1089 }
1090 } else if ((dst_other.mode == ren1->pair->two->mode) &&
1091 sha_eq(dst_other.sha1, ren1->pair->two->sha1)) {
1092 /* Added file on the other side
1093 identical to the file being
1094 renamed: clean merge */
1095 update_file(o, 1, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst);
1096 } else if (!sha_eq(dst_other.sha1, null_sha1)) {
1097 const char *new_path;
1098 clean_merge = 0;
1099 try_merge = 1;
1100 output(o, 1, "CONFLICT (rename/add): Rename %s->%s in %s. "
1101 "%s added in %s",
1102 ren1_src, ren1_dst, branch1,
1103 ren1_dst, branch2);
1104 if (o->call_depth) {
1105 struct merge_file_info mfi;
1106 struct diff_filespec one, a, b;
1108 one.path = a.path = b.path =
1109 (char *)ren1_dst;
1110 hashcpy(one.sha1, null_sha1);
1111 one.mode = 0;
1112 hashcpy(a.sha1, ren1->pair->two->sha1);
1113 a.mode = ren1->pair->two->mode;
1114 hashcpy(b.sha1, dst_other.sha1);
1115 b.mode = dst_other.mode;
1116 mfi = merge_file(o, &one, &a, &b,
1117 branch1,
1118 branch2);
1119 output(o, 1, "Adding merged %s", ren1_dst);
1120 update_file(o, 0,
1121 mfi.sha,
1122 mfi.mode,
1123 ren1_dst);
1124 try_merge = 0;
1125 } else {
1126 new_path = unique_path(o, ren1_dst, branch2);
1127 output(o, 1, "Adding as %s instead", new_path);
1128 update_file(o, 0, dst_other.sha1, dst_other.mode, new_path);
1129 }
1130 } else if ((item = string_list_lookup(renames2Dst, ren1_dst))) {
1131 ren2 = item->util;
1132 clean_merge = 0;
1133 ren2->processed = 1;
1134 output(o, 1, "CONFLICT (rename/rename): "
1135 "Rename %s->%s in %s. "
1136 "Rename %s->%s in %s",
1137 ren1_src, ren1_dst, branch1,
1138 ren2->pair->one->path, ren2->pair->two->path, branch2);
1139 conflict_rename_rename_2to1(o, ren1, branch1, ren2, branch2);
1140 } else
1141 try_merge = 1;
1143 if (try_merge) {
1144 struct diff_filespec *one, *a, *b;
1145 src_other.path = (char *)ren1_src;
1147 one = ren1->pair->one;
1148 if (a_renames == renames1) {
1149 a = ren1->pair->two;
1150 b = &src_other;
1151 } else {
1152 b = ren1->pair->two;
1153 a = &src_other;
1154 }
1155 update_stages_and_entry(ren1_dst, ren1->dst_entry, one, a, b, 1);
1156 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
1157 setup_rename_df_conflict_info(RENAME_NORMAL,
1158 ren1->pair,
1159 NULL,
1160 branch1,
1161 NULL,
1162 ren1->dst_entry,
1163 NULL);
1164 }
1165 }
1166 }
1167 }
1168 string_list_clear(&a_by_dst, 0);
1169 string_list_clear(&b_by_dst, 0);
1171 return clean_merge;
1172 }
1174 static unsigned char *stage_sha(const unsigned char *sha, unsigned mode)
1175 {
1176 return (is_null_sha1(sha) || mode == 0) ? NULL: (unsigned char *)sha;
1177 }
1179 static int read_sha1_strbuf(const unsigned char *sha1, struct strbuf *dst)
1180 {
1181 void *buf;
1182 enum object_type type;
1183 unsigned long size;
1184 buf = read_sha1_file(sha1, &type, &size);
1185 if (!buf)
1186 return error("cannot read object %s", sha1_to_hex(sha1));
1187 if (type != OBJ_BLOB) {
1188 free(buf);
1189 return error("object %s is not a blob", sha1_to_hex(sha1));
1190 }
1191 strbuf_attach(dst, buf, size, size + 1);
1192 return 0;
1193 }
1195 static int blob_unchanged(const unsigned char *o_sha,
1196 const unsigned char *a_sha,
1197 int renormalize, const char *path)
1198 {
1199 struct strbuf o = STRBUF_INIT;
1200 struct strbuf a = STRBUF_INIT;
1201 int ret = 0; /* assume changed for safety */
1203 if (sha_eq(o_sha, a_sha))
1204 return 1;
1205 if (!renormalize)
1206 return 0;
1208 assert(o_sha && a_sha);
1209 if (read_sha1_strbuf(o_sha, &o) || read_sha1_strbuf(a_sha, &a))
1210 goto error_return;
1211 /*
1212 * Note: binary | is used so that both renormalizations are
1213 * performed. Comparison can be skipped if both files are
1214 * unchanged since their sha1s have already been compared.
1215 */
1216 if (renormalize_buffer(path, o.buf, o.len, &o) |
1217 renormalize_buffer(path, a.buf, o.len, &a))
1218 ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len));
1220 error_return:
1221 strbuf_release(&o);
1222 strbuf_release(&a);
1223 return ret;
1224 }
1226 static void handle_delete_modify(struct merge_options *o,
1227 const char *path,
1228 const char *new_path,
1229 unsigned char *a_sha, int a_mode,
1230 unsigned char *b_sha, int b_mode)
1231 {
1232 if (!a_sha) {
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->branch1,
1236 o->branch2, o->branch2, path,
1237 path == new_path ? "" : " at ",
1238 path == new_path ? "" : new_path);
1239 update_file(o, 0, b_sha, b_mode, new_path);
1240 } else {
1241 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1242 "and modified in %s. Version %s of %s left in tree%s%s.",
1243 path, o->branch2,
1244 o->branch1, o->branch1, path,
1245 path == new_path ? "" : " at ",
1246 path == new_path ? "" : new_path);
1247 update_file(o, 0, a_sha, a_mode, new_path);
1248 }
1249 }
1251 static int merge_content(struct merge_options *o,
1252 const char *path,
1253 unsigned char *o_sha, int o_mode,
1254 unsigned char *a_sha, int a_mode,
1255 unsigned char *b_sha, int b_mode,
1256 const char *df_rename_conflict_branch)
1257 {
1258 const char *reason = "content";
1259 struct merge_file_info mfi;
1260 struct diff_filespec one, a, b;
1261 struct stat st;
1262 unsigned df_conflict_remains = 0;
1264 if (!o_sha) {
1265 reason = "add/add";
1266 o_sha = (unsigned char *)null_sha1;
1267 }
1268 one.path = a.path = b.path = (char *)path;
1269 hashcpy(one.sha1, o_sha);
1270 one.mode = o_mode;
1271 hashcpy(a.sha1, a_sha);
1272 a.mode = a_mode;
1273 hashcpy(b.sha1, b_sha);
1274 b.mode = b_mode;
1276 mfi = merge_file(o, &one, &a, &b, o->branch1, o->branch2);
1277 if (df_rename_conflict_branch &&
1278 lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1279 df_conflict_remains = 1;
1280 }
1282 if (mfi.clean && !df_conflict_remains &&
1283 sha_eq(mfi.sha, a_sha) && mfi.mode == a.mode)
1284 output(o, 3, "Skipped %s (merged same as existing)", path);
1285 else
1286 output(o, 2, "Auto-merging %s", path);
1288 if (!mfi.clean) {
1289 if (S_ISGITLINK(mfi.mode))
1290 reason = "submodule";
1291 output(o, 1, "CONFLICT (%s): Merge conflict in %s",
1292 reason, path);
1293 }
1295 if (df_conflict_remains) {
1296 const char *new_path;
1297 update_file_flags(o, mfi.sha, mfi.mode, path,
1298 o->call_depth || mfi.clean, 0);
1299 new_path = unique_path(o, path, df_rename_conflict_branch);
1300 mfi.clean = 0;
1301 output(o, 1, "Adding as %s instead", new_path);
1302 update_file_flags(o, mfi.sha, mfi.mode, new_path, 0, 1);
1303 } else {
1304 update_file(o, mfi.clean, mfi.sha, mfi.mode, path);
1305 }
1306 return mfi.clean;
1308 }
1310 /* Per entry merge function */
1311 static int process_entry(struct merge_options *o,
1312 const char *path, struct stage_data *entry)
1313 {
1314 /*
1315 printf("processing entry, clean cache: %s\n", index_only ? "yes": "no");
1316 print_index_entry("\tpath: ", entry);
1317 */
1318 int clean_merge = 1;
1319 int normalize = o->renormalize;
1320 unsigned o_mode = entry->stages[1].mode;
1321 unsigned a_mode = entry->stages[2].mode;
1322 unsigned b_mode = entry->stages[3].mode;
1323 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1324 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1325 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1327 if (entry->rename_df_conflict_info)
1328 return 1; /* Such cases are handled elsewhere. */
1330 entry->processed = 1;
1331 if (o_sha && (!a_sha || !b_sha)) {
1332 /* Case A: Deleted in one */
1333 if ((!a_sha && !b_sha) ||
1334 (!b_sha && blob_unchanged(o_sha, a_sha, normalize, path)) ||
1335 (!a_sha && blob_unchanged(o_sha, b_sha, normalize, path))) {
1336 /* Deleted in both or deleted in one and
1337 * unchanged in the other */
1338 if (a_sha)
1339 output(o, 2, "Removing %s", path);
1340 /* do not touch working file if it did not exist */
1341 remove_file(o, 1, path, !a_sha);
1342 } else if (string_list_has_string(&o->current_directory_set,
1343 path)) {
1344 entry->processed = 0;
1345 return 1; /* Assume clean until processed */
1346 } else {
1347 /* Deleted in one and changed in the other */
1348 clean_merge = 0;
1349 handle_delete_modify(o, path, path,
1350 a_sha, a_mode, b_sha, b_mode);
1351 }
1353 } else if ((!o_sha && a_sha && !b_sha) ||
1354 (!o_sha && !a_sha && b_sha)) {
1355 /* Case B: Added in one. */
1356 unsigned mode;
1357 const unsigned char *sha;
1359 if (a_sha) {
1360 mode = a_mode;
1361 sha = a_sha;
1362 } else {
1363 mode = b_mode;
1364 sha = b_sha;
1365 }
1366 if (string_list_has_string(&o->current_directory_set, path)) {
1367 /* Handle D->F conflicts after all subfiles */
1368 entry->processed = 0;
1369 return 1; /* Assume clean until processed */
1370 } else {
1371 output(o, 2, "Adding %s", path);
1372 update_file(o, 1, sha, mode, path);
1373 }
1374 } else if (a_sha && b_sha) {
1375 /* Case C: Added in both (check for same permissions) and */
1376 /* case D: Modified in both, but differently. */
1377 clean_merge = merge_content(o, path,
1378 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1379 NULL);
1380 } else if (!o_sha && !a_sha && !b_sha) {
1381 /*
1382 * this entry was deleted altogether. a_mode == 0 means
1383 * we had that path and want to actively remove it.
1384 */
1385 remove_file(o, 1, path, !a_mode);
1386 } else
1387 die("Fatal merge failure, shouldn't happen.");
1389 return clean_merge;
1390 }
1392 /*
1393 * Per entry merge function for D/F (and/or rename) conflicts. In the
1394 * cases we can cleanly resolve D/F conflicts, process_entry() can
1395 * clean out all the files below the directory for us. All D/F
1396 * conflict cases must be handled here at the end to make sure any
1397 * directories that can be cleaned out, are.
1398 *
1399 * Some rename conflicts may also be handled here that don't necessarily
1400 * involve D/F conflicts, since the code to handle them is generic enough
1401 * to handle those rename conflicts with or without D/F conflicts also
1402 * being involved.
1403 */
1404 static int process_df_entry(struct merge_options *o,
1405 const char *path, struct stage_data *entry)
1406 {
1407 int clean_merge = 1;
1408 unsigned o_mode = entry->stages[1].mode;
1409 unsigned a_mode = entry->stages[2].mode;
1410 unsigned b_mode = entry->stages[3].mode;
1411 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1412 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1413 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1414 struct stat st;
1416 entry->processed = 1;
1417 if (entry->rename_df_conflict_info) {
1418 struct rename_df_conflict_info *conflict_info = entry->rename_df_conflict_info;
1419 char *src;
1420 switch (conflict_info->rename_type) {
1421 case RENAME_NORMAL:
1422 clean_merge = merge_content(o, path,
1423 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1424 conflict_info->branch1);
1425 break;
1426 case RENAME_DELETE:
1427 clean_merge = 0;
1428 conflict_rename_delete(o, conflict_info->pair1,
1429 conflict_info->branch1,
1430 conflict_info->branch2);
1431 break;
1432 case RENAME_ONE_FILE_TO_TWO:
1433 src = conflict_info->pair1->one->path;
1434 clean_merge = 0;
1435 output(o, 1, "CONFLICT (rename/rename): "
1436 "Rename \"%s\"->\"%s\" in branch \"%s\" "
1437 "rename \"%s\"->\"%s\" in \"%s\"%s",
1438 src, conflict_info->pair1->two->path, conflict_info->branch1,
1439 src, conflict_info->pair2->two->path, conflict_info->branch2,
1440 o->call_depth ? " (left unresolved)" : "");
1441 if (o->call_depth) {
1442 remove_file_from_cache(src);
1443 update_file(o, 0, conflict_info->pair1->one->sha1,
1444 conflict_info->pair1->one->mode, src);
1445 }
1446 conflict_rename_rename_1to2(o, conflict_info->pair1,
1447 conflict_info->branch1,
1448 conflict_info->pair2,
1449 conflict_info->branch2);
1450 conflict_info->dst_entry2->processed = 1;
1451 break;
1452 default:
1453 entry->processed = 0;
1454 break;
1455 }
1456 } else if (o_sha && (!a_sha || !b_sha)) {
1457 /* Modify/delete; deleted side may have put a directory in the way */
1458 const char *new_path = path;
1459 if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode))
1460 new_path = unique_path(o, path, a_sha ? o->branch1 : o->branch2);
1461 clean_merge = 0;
1462 handle_delete_modify(o, path, new_path,
1463 a_sha, a_mode, b_sha, b_mode);
1464 } else if (!o_sha && !!a_sha != !!b_sha) {
1465 /* directory -> (directory, file) */
1466 const char *add_branch;
1467 const char *other_branch;
1468 unsigned mode;
1469 const unsigned char *sha;
1470 const char *conf;
1472 if (a_sha) {
1473 add_branch = o->branch1;
1474 other_branch = o->branch2;
1475 mode = a_mode;
1476 sha = a_sha;
1477 conf = "file/directory";
1478 } else {
1479 add_branch = o->branch2;
1480 other_branch = o->branch1;
1481 mode = b_mode;
1482 sha = b_sha;
1483 conf = "directory/file";
1484 }
1485 if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1486 const char *new_path = unique_path(o, path, add_branch);
1487 clean_merge = 0;
1488 output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. "
1489 "Adding %s as %s",
1490 conf, path, other_branch, path, new_path);
1491 update_file(o, 0, sha, mode, new_path);
1492 } else {
1493 output(o, 2, "Adding %s", path);
1494 update_file(o, 1, sha, mode, path);
1495 }
1496 } else {
1497 entry->processed = 0;
1498 return 1; /* not handled; assume clean until processed */
1499 }
1501 return clean_merge;
1502 }
1504 int merge_trees(struct merge_options *o,
1505 struct tree *head,
1506 struct tree *merge,
1507 struct tree *common,
1508 struct tree **result)
1509 {
1510 int code, clean;
1512 if (o->subtree_shift) {
1513 merge = shift_tree_object(head, merge, o->subtree_shift);
1514 common = shift_tree_object(head, common, o->subtree_shift);
1515 }
1517 if (sha_eq(common->object.sha1, merge->object.sha1)) {
1518 output(o, 0, "Already up-to-date!");
1519 *result = head;
1520 return 1;
1521 }
1523 code = git_merge_trees(o->call_depth, common, head, merge);
1525 if (code != 0) {
1526 if (show(o, 4) || o->call_depth)
1527 die("merging of trees %s and %s failed",
1528 sha1_to_hex(head->object.sha1),
1529 sha1_to_hex(merge->object.sha1));
1530 else
1531 exit(128);
1532 }
1534 if (unmerged_cache()) {
1535 struct string_list *entries, *re_head, *re_merge;
1536 int i;
1537 string_list_clear(&o->current_file_set, 1);
1538 string_list_clear(&o->current_directory_set, 1);
1539 get_files_dirs(o, head);
1540 get_files_dirs(o, merge);
1542 entries = get_unmerged();
1543 make_room_for_directories_of_df_conflicts(o, entries);
1544 re_head = get_renames(o, head, common, head, merge, entries);
1545 re_merge = get_renames(o, merge, common, head, merge, entries);
1546 clean = process_renames(o, re_head, re_merge);
1547 for (i = 0; i < entries->nr; i++) {
1548 const char *path = entries->items[i].string;
1549 struct stage_data *e = entries->items[i].util;
1550 if (!e->processed
1551 && !process_entry(o, path, e))
1552 clean = 0;
1553 }
1554 for (i = 0; i < entries->nr; i++) {
1555 const char *path = entries->items[i].string;
1556 struct stage_data *e = entries->items[i].util;
1557 if (!e->processed
1558 && !process_df_entry(o, path, e))
1559 clean = 0;
1560 }
1561 for (i = 0; i < entries->nr; i++) {
1562 struct stage_data *e = entries->items[i].util;
1563 if (!e->processed)
1564 die("Unprocessed path??? %s",
1565 entries->items[i].string);
1566 }
1568 string_list_clear(re_merge, 0);
1569 string_list_clear(re_head, 0);
1570 string_list_clear(entries, 1);
1572 }
1573 else
1574 clean = 1;
1576 if (o->call_depth)
1577 *result = write_tree_from_memory(o);
1579 return clean;
1580 }
1582 static struct commit_list *reverse_commit_list(struct commit_list *list)
1583 {
1584 struct commit_list *next = NULL, *current, *backup;
1585 for (current = list; current; current = backup) {
1586 backup = current->next;
1587 current->next = next;
1588 next = current;
1589 }
1590 return next;
1591 }
1593 /*
1594 * Merge the commits h1 and h2, return the resulting virtual
1595 * commit object and a flag indicating the cleanness of the merge.
1596 */
1597 int merge_recursive(struct merge_options *o,
1598 struct commit *h1,
1599 struct commit *h2,
1600 struct commit_list *ca,
1601 struct commit **result)
1602 {
1603 struct commit_list *iter;
1604 struct commit *merged_common_ancestors;
1605 struct tree *mrtree = mrtree;
1606 int clean;
1608 if (show(o, 4)) {
1609 output(o, 4, "Merging:");
1610 output_commit_title(o, h1);
1611 output_commit_title(o, h2);
1612 }
1614 if (!ca) {
1615 ca = get_merge_bases(h1, h2, 1);
1616 ca = reverse_commit_list(ca);
1617 }
1619 if (show(o, 5)) {
1620 output(o, 5, "found %u common ancestor(s):", commit_list_count(ca));
1621 for (iter = ca; iter; iter = iter->next)
1622 output_commit_title(o, iter->item);
1623 }
1625 merged_common_ancestors = pop_commit(&ca);
1626 if (merged_common_ancestors == NULL) {
1627 /* if there is no common ancestor, make an empty tree */
1628 struct tree *tree = xcalloc(1, sizeof(struct tree));
1630 tree->object.parsed = 1;
1631 tree->object.type = OBJ_TREE;
1632 pretend_sha1_file(NULL, 0, OBJ_TREE, tree->object.sha1);
1633 merged_common_ancestors = make_virtual_commit(tree, "ancestor");
1634 }
1636 for (iter = ca; iter; iter = iter->next) {
1637 const char *saved_b1, *saved_b2;
1638 o->call_depth++;
1639 /*
1640 * When the merge fails, the result contains files
1641 * with conflict markers. The cleanness flag is
1642 * ignored, it was never actually used, as result of
1643 * merge_trees has always overwritten it: the committed
1644 * "conflicts" were already resolved.
1645 */
1646 discard_cache();
1647 saved_b1 = o->branch1;
1648 saved_b2 = o->branch2;
1649 o->branch1 = "Temporary merge branch 1";
1650 o->branch2 = "Temporary merge branch 2";
1651 merge_recursive(o, merged_common_ancestors, iter->item,
1652 NULL, &merged_common_ancestors);
1653 o->branch1 = saved_b1;
1654 o->branch2 = saved_b2;
1655 o->call_depth--;
1657 if (!merged_common_ancestors)
1658 die("merge returned no commit");
1659 }
1661 discard_cache();
1662 if (!o->call_depth)
1663 read_cache();
1665 o->ancestor = "merged common ancestors";
1666 clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
1667 &mrtree);
1669 if (o->call_depth) {
1670 *result = make_virtual_commit(mrtree, "merged tree");
1671 commit_list_insert(h1, &(*result)->parents);
1672 commit_list_insert(h2, &(*result)->parents->next);
1673 }
1674 flush_output(o);
1675 if (o->needed_rename_limit)
1676 warning(rename_limit_advice, o->needed_rename_limit);
1677 return clean;
1678 }
1680 static struct commit *get_ref(const unsigned char *sha1, const char *name)
1681 {
1682 struct object *object;
1684 object = deref_tag(parse_object(sha1), name, strlen(name));
1685 if (!object)
1686 return NULL;
1687 if (object->type == OBJ_TREE)
1688 return make_virtual_commit((struct tree*)object, name);
1689 if (object->type != OBJ_COMMIT)
1690 return NULL;
1691 if (parse_commit((struct commit *)object))
1692 return NULL;
1693 return (struct commit *)object;
1694 }
1696 int merge_recursive_generic(struct merge_options *o,
1697 const unsigned char *head,
1698 const unsigned char *merge,
1699 int num_base_list,
1700 const unsigned char **base_list,
1701 struct commit **result)
1702 {
1703 int clean, index_fd;
1704 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
1705 struct commit *head_commit = get_ref(head, o->branch1);
1706 struct commit *next_commit = get_ref(merge, o->branch2);
1707 struct commit_list *ca = NULL;
1709 if (base_list) {
1710 int i;
1711 for (i = 0; i < num_base_list; ++i) {
1712 struct commit *base;
1713 if (!(base = get_ref(base_list[i], sha1_to_hex(base_list[i]))))
1714 return error("Could not parse object '%s'",
1715 sha1_to_hex(base_list[i]));
1716 commit_list_insert(base, &ca);
1717 }
1718 }
1720 index_fd = hold_locked_index(lock, 1);
1721 clean = merge_recursive(o, head_commit, next_commit, ca,
1722 result);
1723 if (active_cache_changed &&
1724 (write_cache(index_fd, active_cache, active_nr) ||
1725 commit_locked_index(lock)))
1726 return error("Unable to write index.");
1728 return clean ? 0 : 1;
1729 }
1731 static int merge_recursive_config(const char *var, const char *value, void *cb)
1732 {
1733 struct merge_options *o = cb;
1734 if (!strcasecmp(var, "merge.verbosity")) {
1735 o->verbosity = git_config_int(var, value);
1736 return 0;
1737 }
1738 if (!strcasecmp(var, "diff.renamelimit")) {
1739 o->diff_rename_limit = git_config_int(var, value);
1740 return 0;
1741 }
1742 if (!strcasecmp(var, "merge.renamelimit")) {
1743 o->merge_rename_limit = git_config_int(var, value);
1744 return 0;
1745 }
1746 return git_xmerge_config(var, value, cb);
1747 }
1749 void init_merge_options(struct merge_options *o)
1750 {
1751 memset(o, 0, sizeof(struct merge_options));
1752 o->verbosity = 2;
1753 o->buffer_output = 1;
1754 o->diff_rename_limit = -1;
1755 o->merge_rename_limit = -1;
1756 o->renormalize = 0;
1757 git_config(merge_recursive_config, o);
1758 if (getenv("GIT_MERGE_VERBOSITY"))
1759 o->verbosity =
1760 strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10);
1761 if (o->verbosity >= 5)
1762 o->buffer_output = 0;
1763 strbuf_init(&o->obuf, 0);
1764 memset(&o->current_file_set, 0, sizeof(struct string_list));
1765 o->current_file_set.strdup_strings = 1;
1766 memset(&o->current_directory_set, 0, sizeof(struct string_list));
1767 o->current_directory_set.strdup_strings = 1;
1768 }
1770 int parse_merge_opt(struct merge_options *o, const char *s)
1771 {
1772 if (!s || !*s)
1773 return -1;
1774 if (!strcmp(s, "ours"))
1775 o->recursive_variant = MERGE_RECURSIVE_OURS;
1776 else if (!strcmp(s, "theirs"))
1777 o->recursive_variant = MERGE_RECURSIVE_THEIRS;
1778 else if (!strcmp(s, "subtree"))
1779 o->subtree_shift = "";
1780 else if (!prefixcmp(s, "subtree="))
1781 o->subtree_shift = s + strlen("subtree=");
1782 else if (!strcmp(s, "patience"))
1783 o->xdl_opts |= XDF_PATIENCE_DIFF;
1784 else if (!strcmp(s, "ignore-space-change"))
1785 o->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
1786 else if (!strcmp(s, "ignore-all-space"))
1787 o->xdl_opts |= XDF_IGNORE_WHITESPACE;
1788 else if (!strcmp(s, "ignore-space-at-eol"))
1789 o->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
1790 else if (!strcmp(s, "renormalize"))
1791 o->renormalize = 1;
1792 else if (!strcmp(s, "no-renormalize"))
1793 o->renormalize = 0;
1794 else if (!prefixcmp(s, "rename-threshold=")) {
1795 const char *score = s + strlen("rename-threshold=");
1796 if ((o->rename_score = parse_rename_score(&score)) == -1 || *score != 0)
1797 return -1;
1798 }
1799 else
1800 return -1;
1801 return 0;
1802 }