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