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1 /*
2 * Recursive Merge algorithm stolen from git-merge-recursive.py by
3 * Fredrik Kuivinen.
4 * The thieves were Alex Riesen and Johannes Schindelin, in June/July 2006
5 */
6 #include "advice.h"
7 #include "cache.h"
8 #include "cache-tree.h"
9 #include "commit.h"
10 #include "blob.h"
11 #include "builtin.h"
12 #include "tree-walk.h"
13 #include "diff.h"
14 #include "diffcore.h"
15 #include "tag.h"
16 #include "unpack-trees.h"
17 #include "string-list.h"
18 #include "xdiff-interface.h"
19 #include "ll-merge.h"
20 #include "attr.h"
21 #include "merge-recursive.h"
22 #include "dir.h"
23 #include "submodule.h"
25 static struct tree *shift_tree_object(struct tree *one, struct tree *two,
26 const char *subtree_shift)
27 {
28 unsigned char shifted[20];
30 if (!*subtree_shift) {
31 shift_tree(one->object.sha1, two->object.sha1, shifted, 0);
32 } else {
33 shift_tree_by(one->object.sha1, two->object.sha1, shifted,
34 subtree_shift);
35 }
36 if (!hashcmp(two->object.sha1, shifted))
37 return two;
38 return lookup_tree(shifted);
39 }
41 /*
42 * A virtual commit has (const char *)commit->util set to the name.
43 */
45 static struct commit *make_virtual_commit(struct tree *tree, const char *comment)
46 {
47 struct commit *commit = xcalloc(1, sizeof(struct commit));
48 commit->tree = tree;
49 commit->util = (void*)comment;
50 /* avoid warnings */
51 commit->object.parsed = 1;
52 return commit;
53 }
55 /*
56 * Since we use get_tree_entry(), which does not put the read object into
57 * the object pool, we cannot rely on a == b.
58 */
59 static int sha_eq(const unsigned char *a, const unsigned char *b)
60 {
61 if (!a && !b)
62 return 2;
63 return a && b && hashcmp(a, b) == 0;
64 }
66 enum rename_type {
67 RENAME_NORMAL = 0,
68 RENAME_DELETE,
69 RENAME_ONE_FILE_TO_TWO
70 };
72 struct rename_df_conflict_info {
73 enum rename_type rename_type;
74 struct diff_filepair *pair1;
75 struct diff_filepair *pair2;
76 const char *branch1;
77 const char *branch2;
78 struct stage_data *dst_entry1;
79 struct stage_data *dst_entry2;
80 };
82 /*
83 * Since we want to write the index eventually, we cannot reuse the index
84 * for these (temporary) data.
85 */
86 struct stage_data {
87 struct {
88 unsigned mode;
89 unsigned char sha[20];
90 } stages[4];
91 struct rename_df_conflict_info *rename_df_conflict_info;
92 unsigned processed:1;
93 };
95 static inline void setup_rename_df_conflict_info(enum rename_type rename_type,
96 struct diff_filepair *pair1,
97 struct diff_filepair *pair2,
98 const char *branch1,
99 const char *branch2,
100 struct stage_data *dst_entry1,
101 struct stage_data *dst_entry2)
102 {
103 struct rename_df_conflict_info *ci = xcalloc(1, sizeof(struct rename_df_conflict_info));
104 ci->rename_type = rename_type;
105 ci->pair1 = pair1;
106 ci->branch1 = branch1;
107 ci->branch2 = branch2;
109 ci->dst_entry1 = dst_entry1;
110 dst_entry1->rename_df_conflict_info = ci;
111 dst_entry1->processed = 0;
113 assert(!pair2 == !dst_entry2);
114 if (dst_entry2) {
115 ci->dst_entry2 = dst_entry2;
116 ci->pair2 = pair2;
117 dst_entry2->rename_df_conflict_info = ci;
118 dst_entry2->processed = 0;
119 }
120 }
122 static int show(struct merge_options *o, int v)
123 {
124 return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5;
125 }
127 static void flush_output(struct merge_options *o)
128 {
129 if (o->obuf.len) {
130 fputs(o->obuf.buf, stdout);
131 strbuf_reset(&o->obuf);
132 }
133 }
135 __attribute__((format (printf, 3, 4)))
136 static void output(struct merge_options *o, int v, const char *fmt, ...)
137 {
138 va_list ap;
140 if (!show(o, v))
141 return;
143 strbuf_grow(&o->obuf, o->call_depth * 2 + 2);
144 memset(o->obuf.buf + o->obuf.len, ' ', o->call_depth * 2);
145 strbuf_setlen(&o->obuf, o->obuf.len + o->call_depth * 2);
147 va_start(ap, fmt);
148 strbuf_vaddf(&o->obuf, fmt, ap);
149 va_end(ap);
151 strbuf_add(&o->obuf, "\n", 1);
152 if (!o->buffer_output)
153 flush_output(o);
154 }
156 static void output_commit_title(struct merge_options *o, struct commit *commit)
157 {
158 int i;
159 flush_output(o);
160 for (i = o->call_depth; i--;)
161 fputs(" ", stdout);
162 if (commit->util)
163 printf("virtual %s\n", (char *)commit->util);
164 else {
165 printf("%s ", find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV));
166 if (parse_commit(commit) != 0)
167 printf("(bad commit)\n");
168 else {
169 const char *title;
170 int len = find_commit_subject(commit->buffer, &title);
171 if (len)
172 printf("%.*s\n", len, title);
173 }
174 }
175 }
177 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
178 const char *path, int stage, int refresh, int options)
179 {
180 struct cache_entry *ce;
181 ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage, refresh);
182 if (!ce)
183 return error("addinfo_cache failed for path '%s'", path);
184 return add_cache_entry(ce, options);
185 }
187 static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree)
188 {
189 parse_tree(tree);
190 init_tree_desc(desc, tree->buffer, tree->size);
191 }
193 static int git_merge_trees(int index_only,
194 struct tree *common,
195 struct tree *head,
196 struct tree *merge)
197 {
198 int rc;
199 struct tree_desc t[3];
200 struct unpack_trees_options opts;
202 memset(&opts, 0, sizeof(opts));
203 if (index_only)
204 opts.index_only = 1;
205 else
206 opts.update = 1;
207 opts.merge = 1;
208 opts.head_idx = 2;
209 opts.fn = threeway_merge;
210 opts.src_index = &the_index;
211 opts.dst_index = &the_index;
212 setup_unpack_trees_porcelain(&opts, "merge");
214 init_tree_desc_from_tree(t+0, common);
215 init_tree_desc_from_tree(t+1, head);
216 init_tree_desc_from_tree(t+2, merge);
218 rc = unpack_trees(3, t, &opts);
219 cache_tree_free(&active_cache_tree);
220 return rc;
221 }
223 struct tree *write_tree_from_memory(struct merge_options *o)
224 {
225 struct tree *result = NULL;
227 if (unmerged_cache()) {
228 int i;
229 fprintf(stderr, "BUG: There are unmerged index entries:\n");
230 for (i = 0; i < active_nr; i++) {
231 struct cache_entry *ce = active_cache[i];
232 if (ce_stage(ce))
233 fprintf(stderr, "BUG: %d %.*s", ce_stage(ce),
234 (int)ce_namelen(ce), ce->name);
235 }
236 die("Bug in merge-recursive.c");
237 }
239 if (!active_cache_tree)
240 active_cache_tree = cache_tree();
242 if (!cache_tree_fully_valid(active_cache_tree) &&
243 cache_tree_update(active_cache_tree,
244 active_cache, active_nr, 0, 0) < 0)
245 die("error building trees");
247 result = lookup_tree(active_cache_tree->sha1);
249 return result;
250 }
252 static int save_files_dirs(const unsigned char *sha1,
253 const char *base, int baselen, const char *path,
254 unsigned int mode, int stage, void *context)
255 {
256 int len = strlen(path);
257 char *newpath = xmalloc(baselen + len + 1);
258 struct merge_options *o = context;
260 memcpy(newpath, base, baselen);
261 memcpy(newpath + baselen, path, len);
262 newpath[baselen + len] = '\0';
264 if (S_ISDIR(mode))
265 string_list_insert(&o->current_directory_set, newpath);
266 else
267 string_list_insert(&o->current_file_set, newpath);
268 free(newpath);
270 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
271 }
273 static int get_files_dirs(struct merge_options *o, struct tree *tree)
274 {
275 int n;
276 if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs, o))
277 return 0;
278 n = o->current_file_set.nr + o->current_directory_set.nr;
279 return n;
280 }
282 /*
283 * Returns an index_entry instance which doesn't have to correspond to
284 * a real cache entry in Git's index.
285 */
286 static struct stage_data *insert_stage_data(const char *path,
287 struct tree *o, struct tree *a, struct tree *b,
288 struct string_list *entries)
289 {
290 struct string_list_item *item;
291 struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
292 get_tree_entry(o->object.sha1, path,
293 e->stages[1].sha, &e->stages[1].mode);
294 get_tree_entry(a->object.sha1, path,
295 e->stages[2].sha, &e->stages[2].mode);
296 get_tree_entry(b->object.sha1, path,
297 e->stages[3].sha, &e->stages[3].mode);
298 item = string_list_insert(entries, path);
299 item->util = e;
300 return e;
301 }
303 /*
304 * Create a dictionary mapping file names to stage_data objects. The
305 * dictionary contains one entry for every path with a non-zero stage entry.
306 */
307 static struct string_list *get_unmerged(void)
308 {
309 struct string_list *unmerged = xcalloc(1, sizeof(struct string_list));
310 int i;
312 unmerged->strdup_strings = 1;
314 for (i = 0; i < active_nr; i++) {
315 struct string_list_item *item;
316 struct stage_data *e;
317 struct cache_entry *ce = active_cache[i];
318 if (!ce_stage(ce))
319 continue;
321 item = string_list_lookup(unmerged, ce->name);
322 if (!item) {
323 item = string_list_insert(unmerged, ce->name);
324 item->util = xcalloc(1, sizeof(struct stage_data));
325 }
326 e = item->util;
327 e->stages[ce_stage(ce)].mode = ce->ce_mode;
328 hashcpy(e->stages[ce_stage(ce)].sha, ce->sha1);
329 }
331 return unmerged;
332 }
334 static void make_room_for_directories_of_df_conflicts(struct merge_options *o,
335 struct string_list *entries)
336 {
337 /* If there are D/F conflicts, and the paths currently exist
338 * in the working copy as a file, we want to remove them to
339 * make room for the corresponding directory. Such paths will
340 * later be processed in process_df_entry() at the end. If
341 * the corresponding directory ends up being removed by the
342 * merge, then the file will be reinstated at that time;
343 * otherwise, if the file is not supposed to be removed by the
344 * merge, the contents of the file will be placed in another
345 * unique filename.
346 *
347 * NOTE: This function relies on the fact that entries for a
348 * D/F conflict will appear adjacent in the index, with the
349 * entries for the file appearing before entries for paths
350 * below the corresponding directory.
351 */
352 const char *last_file = NULL;
353 int last_len = 0;
354 struct stage_data *last_e;
355 int i;
357 for (i = 0; i < entries->nr; i++) {
358 const char *path = entries->items[i].string;
359 int len = strlen(path);
360 struct stage_data *e = entries->items[i].util;
362 /*
363 * Check if last_file & path correspond to a D/F conflict;
364 * i.e. whether path is last_file+'/'+<something>.
365 * If so, remove last_file to make room for path and friends.
366 */
367 if (last_file &&
368 len > last_len &&
369 memcmp(path, last_file, last_len) == 0 &&
370 path[last_len] == '/') {
371 output(o, 3, "Removing %s to make room for subdirectory; may re-add later.", last_file);
372 unlink(last_file);
373 }
375 /*
376 * Determine whether path could exist as a file in the
377 * working directory as a possible D/F conflict. This
378 * will only occur when it exists in stage 2 as a
379 * file.
380 */
381 if (S_ISREG(e->stages[2].mode) || S_ISLNK(e->stages[2].mode)) {
382 last_file = path;
383 last_len = len;
384 last_e = e;
385 } else {
386 last_file = NULL;
387 }
388 }
389 }
391 struct rename {
392 struct diff_filepair *pair;
393 struct stage_data *src_entry;
394 struct stage_data *dst_entry;
395 unsigned processed:1;
396 };
398 /*
399 * Get information of all renames which occurred between 'o_tree' and
400 * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
401 * 'b_tree') to be able to associate the correct cache entries with
402 * the rename information. 'tree' is always equal to either a_tree or b_tree.
403 */
404 static struct string_list *get_renames(struct merge_options *o,
405 struct tree *tree,
406 struct tree *o_tree,
407 struct tree *a_tree,
408 struct tree *b_tree,
409 struct string_list *entries)
410 {
411 int i;
412 struct string_list *renames;
413 struct diff_options opts;
415 renames = xcalloc(1, sizeof(struct string_list));
416 diff_setup(&opts);
417 DIFF_OPT_SET(&opts, RECURSIVE);
418 opts.detect_rename = DIFF_DETECT_RENAME;
419 opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
420 o->diff_rename_limit >= 0 ? o->diff_rename_limit :
421 500;
422 opts.rename_score = o->rename_score;
423 opts.warn_on_too_large_rename = 1;
424 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
425 if (diff_setup_done(&opts) < 0)
426 die("diff setup failed");
427 diff_tree_sha1(o_tree->object.sha1, tree->object.sha1, "", &opts);
428 diffcore_std(&opts);
429 for (i = 0; i < diff_queued_diff.nr; ++i) {
430 struct string_list_item *item;
431 struct rename *re;
432 struct diff_filepair *pair = diff_queued_diff.queue[i];
433 if (pair->status != 'R') {
434 diff_free_filepair(pair);
435 continue;
436 }
437 re = xmalloc(sizeof(*re));
438 re->processed = 0;
439 re->pair = pair;
440 item = string_list_lookup(entries, re->pair->one->path);
441 if (!item)
442 re->src_entry = insert_stage_data(re->pair->one->path,
443 o_tree, a_tree, b_tree, entries);
444 else
445 re->src_entry = item->util;
447 item = string_list_lookup(entries, re->pair->two->path);
448 if (!item)
449 re->dst_entry = insert_stage_data(re->pair->two->path,
450 o_tree, a_tree, b_tree, entries);
451 else
452 re->dst_entry = item->util;
453 item = string_list_insert(renames, pair->one->path);
454 item->util = re;
455 }
456 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
457 diff_queued_diff.nr = 0;
458 diff_flush(&opts);
459 return renames;
460 }
462 static int update_stages_options(const char *path, struct diff_filespec *o,
463 struct diff_filespec *a, struct diff_filespec *b,
464 int clear, int options)
465 {
466 if (clear)
467 if (remove_file_from_cache(path))
468 return -1;
469 if (o)
470 if (add_cacheinfo(o->mode, o->sha1, path, 1, 0, options))
471 return -1;
472 if (a)
473 if (add_cacheinfo(a->mode, a->sha1, path, 2, 0, options))
474 return -1;
475 if (b)
476 if (add_cacheinfo(b->mode, b->sha1, path, 3, 0, options))
477 return -1;
478 return 0;
479 }
481 static int update_stages(const char *path, struct diff_filespec *o,
482 struct diff_filespec *a, struct diff_filespec *b,
483 int clear)
484 {
485 int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE;
486 return update_stages_options(path, o, a, b, clear, options);
487 }
489 static int update_stages_and_entry(const char *path,
490 struct stage_data *entry,
491 struct diff_filespec *o,
492 struct diff_filespec *a,
493 struct diff_filespec *b,
494 int clear)
495 {
496 int options;
498 entry->processed = 0;
499 entry->stages[1].mode = o->mode;
500 entry->stages[2].mode = a->mode;
501 entry->stages[3].mode = b->mode;
502 hashcpy(entry->stages[1].sha, o->sha1);
503 hashcpy(entry->stages[2].sha, a->sha1);
504 hashcpy(entry->stages[3].sha, b->sha1);
505 options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_SKIP_DFCHECK;
506 return update_stages_options(path, o, a, b, clear, options);
507 }
509 static int remove_file(struct merge_options *o, int clean,
510 const char *path, int no_wd)
511 {
512 int update_cache = o->call_depth || clean;
513 int update_working_directory = !o->call_depth && !no_wd;
515 if (update_cache) {
516 if (remove_file_from_cache(path))
517 return -1;
518 }
519 if (update_working_directory) {
520 if (remove_path(path))
521 return -1;
522 }
523 return 0;
524 }
526 static char *unique_path(struct merge_options *o, const char *path, const char *branch)
527 {
528 char *newpath = xmalloc(strlen(path) + 1 + strlen(branch) + 8 + 1);
529 int suffix = 0;
530 struct stat st;
531 char *p = newpath + strlen(path);
532 strcpy(newpath, path);
533 *(p++) = '~';
534 strcpy(p, branch);
535 for (; *p; ++p)
536 if ('/' == *p)
537 *p = '_';
538 while (string_list_has_string(&o->current_file_set, newpath) ||
539 string_list_has_string(&o->current_directory_set, newpath) ||
540 lstat(newpath, &st) == 0)
541 sprintf(p, "_%d", suffix++);
543 string_list_insert(&o->current_file_set, newpath);
544 return newpath;
545 }
547 static void flush_buffer(int fd, const char *buf, unsigned long size)
548 {
549 while (size > 0) {
550 long ret = write_in_full(fd, buf, size);
551 if (ret < 0) {
552 /* Ignore epipe */
553 if (errno == EPIPE)
554 break;
555 die_errno("merge-recursive");
556 } else if (!ret) {
557 die("merge-recursive: disk full?");
558 }
559 size -= ret;
560 buf += ret;
561 }
562 }
564 static int would_lose_untracked(const char *path)
565 {
566 int pos = cache_name_pos(path, strlen(path));
568 if (pos < 0)
569 pos = -1 - pos;
570 while (pos < active_nr &&
571 !strcmp(path, active_cache[pos]->name)) {
572 /*
573 * If stage #0, it is definitely tracked.
574 * If it has stage #2 then it was tracked
575 * before this merge started. All other
576 * cases the path was not tracked.
577 */
578 switch (ce_stage(active_cache[pos])) {
579 case 0:
580 case 2:
581 return 0;
582 }
583 pos++;
584 }
585 return file_exists(path);
586 }
588 static int make_room_for_path(const char *path)
589 {
590 int status;
591 const char *msg = "failed to create path '%s'%s";
593 status = safe_create_leading_directories_const(path);
594 if (status) {
595 if (status == -3) {
596 /* something else exists */
597 error(msg, path, ": perhaps a D/F conflict?");
598 return -1;
599 }
600 die(msg, path, "");
601 }
603 /*
604 * Do not unlink a file in the work tree if we are not
605 * tracking it.
606 */
607 if (would_lose_untracked(path))
608 return error("refusing to lose untracked file at '%s'",
609 path);
611 /* Successful unlink is good.. */
612 if (!unlink(path))
613 return 0;
614 /* .. and so is no existing file */
615 if (errno == ENOENT)
616 return 0;
617 /* .. but not some other error (who really cares what?) */
618 return error(msg, path, ": perhaps a D/F conflict?");
619 }
621 static void update_file_flags(struct merge_options *o,
622 const unsigned char *sha,
623 unsigned mode,
624 const char *path,
625 int update_cache,
626 int update_wd)
627 {
628 if (o->call_depth)
629 update_wd = 0;
631 if (update_wd) {
632 enum object_type type;
633 void *buf;
634 unsigned long size;
636 if (S_ISGITLINK(mode)) {
637 /*
638 * We may later decide to recursively descend into
639 * the submodule directory and update its index
640 * and/or work tree, but we do not do that now.
641 */
642 update_wd = 0;
643 goto update_index;
644 }
646 buf = read_sha1_file(sha, &type, &size);
647 if (!buf)
648 die("cannot read object %s '%s'", sha1_to_hex(sha), path);
649 if (type != OBJ_BLOB)
650 die("blob expected for %s '%s'", sha1_to_hex(sha), path);
651 if (S_ISREG(mode)) {
652 struct strbuf strbuf = STRBUF_INIT;
653 if (convert_to_working_tree(path, buf, size, &strbuf)) {
654 free(buf);
655 size = strbuf.len;
656 buf = strbuf_detach(&strbuf, NULL);
657 }
658 }
660 if (make_room_for_path(path) < 0) {
661 update_wd = 0;
662 free(buf);
663 goto update_index;
664 }
665 if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
666 int fd;
667 if (mode & 0100)
668 mode = 0777;
669 else
670 mode = 0666;
671 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
672 if (fd < 0)
673 die_errno("failed to open '%s'", path);
674 flush_buffer(fd, buf, size);
675 close(fd);
676 } else if (S_ISLNK(mode)) {
677 char *lnk = xmemdupz(buf, size);
678 safe_create_leading_directories_const(path);
679 unlink(path);
680 if (symlink(lnk, path))
681 die_errno("failed to symlink '%s'", path);
682 free(lnk);
683 } else
684 die("do not know what to do with %06o %s '%s'",
685 mode, sha1_to_hex(sha), path);
686 free(buf);
687 }
688 update_index:
689 if (update_cache)
690 add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
691 }
693 static void update_file(struct merge_options *o,
694 int clean,
695 const unsigned char *sha,
696 unsigned mode,
697 const char *path)
698 {
699 update_file_flags(o, sha, mode, path, o->call_depth || clean, !o->call_depth);
700 }
702 /* Low level file merging, update and removal */
704 struct merge_file_info {
705 unsigned char sha[20];
706 unsigned mode;
707 unsigned clean:1,
708 merge:1;
709 };
711 static int merge_3way(struct merge_options *o,
712 mmbuffer_t *result_buf,
713 struct diff_filespec *one,
714 struct diff_filespec *a,
715 struct diff_filespec *b,
716 const char *branch1,
717 const char *branch2)
718 {
719 mmfile_t orig, src1, src2;
720 struct ll_merge_options ll_opts = {0};
721 char *base_name, *name1, *name2;
722 int merge_status;
724 ll_opts.renormalize = o->renormalize;
725 ll_opts.xdl_opts = o->xdl_opts;
727 if (o->call_depth) {
728 ll_opts.virtual_ancestor = 1;
729 ll_opts.variant = 0;
730 } else {
731 switch (o->recursive_variant) {
732 case MERGE_RECURSIVE_OURS:
733 ll_opts.variant = XDL_MERGE_FAVOR_OURS;
734 break;
735 case MERGE_RECURSIVE_THEIRS:
736 ll_opts.variant = XDL_MERGE_FAVOR_THEIRS;
737 break;
738 default:
739 ll_opts.variant = 0;
740 break;
741 }
742 }
744 if (strcmp(a->path, b->path) ||
745 (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) {
746 base_name = o->ancestor == NULL ? NULL :
747 xstrdup(mkpath("%s:%s", o->ancestor, one->path));
748 name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
749 name2 = xstrdup(mkpath("%s:%s", branch2, b->path));
750 } else {
751 base_name = o->ancestor == NULL ? NULL :
752 xstrdup(mkpath("%s", o->ancestor));
753 name1 = xstrdup(mkpath("%s", branch1));
754 name2 = xstrdup(mkpath("%s", branch2));
755 }
757 read_mmblob(&orig, one->sha1);
758 read_mmblob(&src1, a->sha1);
759 read_mmblob(&src2, b->sha1);
761 merge_status = ll_merge(result_buf, a->path, &orig, base_name,
762 &src1, name1, &src2, name2, &ll_opts);
764 free(name1);
765 free(name2);
766 free(orig.ptr);
767 free(src1.ptr);
768 free(src2.ptr);
769 return merge_status;
770 }
772 static struct merge_file_info merge_file(struct merge_options *o,
773 struct diff_filespec *one,
774 struct diff_filespec *a,
775 struct diff_filespec *b,
776 const char *branch1,
777 const char *branch2)
778 {
779 struct merge_file_info result;
780 result.merge = 0;
781 result.clean = 1;
783 if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) {
784 result.clean = 0;
785 if (S_ISREG(a->mode)) {
786 result.mode = a->mode;
787 hashcpy(result.sha, a->sha1);
788 } else {
789 result.mode = b->mode;
790 hashcpy(result.sha, b->sha1);
791 }
792 } else {
793 if (!sha_eq(a->sha1, one->sha1) && !sha_eq(b->sha1, one->sha1))
794 result.merge = 1;
796 /*
797 * Merge modes
798 */
799 if (a->mode == b->mode || a->mode == one->mode)
800 result.mode = b->mode;
801 else {
802 result.mode = a->mode;
803 if (b->mode != one->mode) {
804 result.clean = 0;
805 result.merge = 1;
806 }
807 }
809 if (sha_eq(a->sha1, b->sha1) || sha_eq(a->sha1, one->sha1))
810 hashcpy(result.sha, b->sha1);
811 else if (sha_eq(b->sha1, one->sha1))
812 hashcpy(result.sha, a->sha1);
813 else if (S_ISREG(a->mode)) {
814 mmbuffer_t result_buf;
815 int merge_status;
817 merge_status = merge_3way(o, &result_buf, one, a, b,
818 branch1, branch2);
820 if ((merge_status < 0) || !result_buf.ptr)
821 die("Failed to execute internal merge");
823 if (write_sha1_file(result_buf.ptr, result_buf.size,
824 blob_type, result.sha))
825 die("Unable to add %s to database",
826 a->path);
828 free(result_buf.ptr);
829 result.clean = (merge_status == 0);
830 } else if (S_ISGITLINK(a->mode)) {
831 result.clean = merge_submodule(result.sha, one->path, one->sha1,
832 a->sha1, b->sha1);
833 } else if (S_ISLNK(a->mode)) {
834 hashcpy(result.sha, a->sha1);
836 if (!sha_eq(a->sha1, b->sha1))
837 result.clean = 0;
838 } else {
839 die("unsupported object type in the tree");
840 }
841 }
843 return result;
844 }
846 static void conflict_rename_delete(struct merge_options *o,
847 struct diff_filepair *pair,
848 const char *rename_branch,
849 const char *other_branch)
850 {
851 char *dest_name = pair->two->path;
852 int df_conflict = 0;
853 struct stat st;
855 output(o, 1, "CONFLICT (rename/delete): Rename %s->%s in %s "
856 "and deleted in %s",
857 pair->one->path, pair->two->path, rename_branch,
858 other_branch);
859 if (!o->call_depth)
860 update_stages(dest_name, NULL,
861 rename_branch == o->branch1 ? pair->two : NULL,
862 rename_branch == o->branch1 ? NULL : pair->two,
863 1);
864 if (lstat(dest_name, &st) == 0 && S_ISDIR(st.st_mode)) {
865 dest_name = unique_path(o, dest_name, rename_branch);
866 df_conflict = 1;
867 }
868 update_file(o, 0, pair->two->sha1, pair->two->mode, dest_name);
869 if (df_conflict)
870 free(dest_name);
871 }
873 static void conflict_rename_rename_1to2(struct merge_options *o,
874 struct diff_filepair *pair1,
875 const char *branch1,
876 struct diff_filepair *pair2,
877 const char *branch2)
878 {
879 /* One file was renamed in both branches, but to different names. */
880 char *del[2];
881 int delp = 0;
882 const char *ren1_dst = pair1->two->path;
883 const char *ren2_dst = pair2->two->path;
884 const char *dst_name1 = ren1_dst;
885 const char *dst_name2 = ren2_dst;
886 struct stat st;
887 if (lstat(ren1_dst, &st) == 0 && S_ISDIR(st.st_mode)) {
888 dst_name1 = del[delp++] = unique_path(o, ren1_dst, branch1);
889 output(o, 1, "%s is a directory in %s adding as %s instead",
890 ren1_dst, branch2, dst_name1);
891 }
892 if (lstat(ren2_dst, &st) == 0 && S_ISDIR(st.st_mode)) {
893 dst_name2 = del[delp++] = unique_path(o, ren2_dst, branch2);
894 output(o, 1, "%s is a directory in %s adding as %s instead",
895 ren2_dst, branch1, dst_name2);
896 }
897 if (o->call_depth) {
898 remove_file_from_cache(dst_name1);
899 remove_file_from_cache(dst_name2);
900 /*
901 * Uncomment to leave the conflicting names in the resulting tree
902 *
903 * update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1);
904 * update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2);
905 */
906 } else {
907 update_stages(ren1_dst, NULL, pair1->two, NULL, 1);
908 update_stages(ren2_dst, NULL, NULL, pair2->two, 1);
910 update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1);
911 update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2);
912 }
913 while (delp--)
914 free(del[delp]);
915 }
917 static void conflict_rename_rename_2to1(struct merge_options *o,
918 struct rename *ren1,
919 const char *branch1,
920 struct rename *ren2,
921 const char *branch2)
922 {
923 /* Two files were renamed to the same thing. */
924 char *new_path1 = unique_path(o, ren1->pair->two->path, branch1);
925 char *new_path2 = unique_path(o, ren2->pair->two->path, branch2);
926 output(o, 1, "Renaming %s to %s and %s to %s instead",
927 ren1->pair->one->path, new_path1,
928 ren2->pair->one->path, new_path2);
929 remove_file(o, 0, ren1->pair->two->path, 0);
930 update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path1);
931 update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, new_path2);
932 free(new_path2);
933 free(new_path1);
934 }
936 static int process_renames(struct merge_options *o,
937 struct string_list *a_renames,
938 struct string_list *b_renames)
939 {
940 int clean_merge = 1, i, j;
941 struct string_list a_by_dst = STRING_LIST_INIT_NODUP;
942 struct string_list b_by_dst = STRING_LIST_INIT_NODUP;
943 const struct rename *sre;
945 for (i = 0; i < a_renames->nr; i++) {
946 sre = a_renames->items[i].util;
947 string_list_insert(&a_by_dst, sre->pair->two->path)->util
948 = sre->dst_entry;
949 }
950 for (i = 0; i < b_renames->nr; i++) {
951 sre = b_renames->items[i].util;
952 string_list_insert(&b_by_dst, sre->pair->two->path)->util
953 = sre->dst_entry;
954 }
956 for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
957 char *src;
958 struct string_list *renames1, *renames2Dst;
959 struct rename *ren1 = NULL, *ren2 = NULL;
960 const char *branch1, *branch2;
961 const char *ren1_src, *ren1_dst;
963 if (i >= a_renames->nr) {
964 ren2 = b_renames->items[j++].util;
965 } else if (j >= b_renames->nr) {
966 ren1 = a_renames->items[i++].util;
967 } else {
968 int compare = strcmp(a_renames->items[i].string,
969 b_renames->items[j].string);
970 if (compare <= 0)
971 ren1 = a_renames->items[i++].util;
972 if (compare >= 0)
973 ren2 = b_renames->items[j++].util;
974 }
976 /* TODO: refactor, so that 1/2 are not needed */
977 if (ren1) {
978 renames1 = a_renames;
979 renames2Dst = &b_by_dst;
980 branch1 = o->branch1;
981 branch2 = o->branch2;
982 } else {
983 struct rename *tmp;
984 renames1 = b_renames;
985 renames2Dst = &a_by_dst;
986 branch1 = o->branch2;
987 branch2 = o->branch1;
988 tmp = ren2;
989 ren2 = ren1;
990 ren1 = tmp;
991 }
992 src = ren1->pair->one->path;
994 ren1->dst_entry->processed = 1;
995 ren1->src_entry->processed = 1;
997 if (ren1->processed)
998 continue;
999 ren1->processed = 1;
1001 ren1_src = ren1->pair->one->path;
1002 ren1_dst = ren1->pair->two->path;
1004 if (ren2) {
1005 const char *ren2_src = ren2->pair->one->path;
1006 const char *ren2_dst = ren2->pair->two->path;
1007 /* Renamed in 1 and renamed in 2 */
1008 if (strcmp(ren1_src, ren2_src) != 0)
1009 die("ren1.src != ren2.src");
1010 ren2->dst_entry->processed = 1;
1011 ren2->processed = 1;
1012 if (strcmp(ren1_dst, ren2_dst) != 0) {
1013 setup_rename_df_conflict_info(RENAME_ONE_FILE_TO_TWO,
1014 ren1->pair,
1015 ren2->pair,
1016 branch1,
1017 branch2,
1018 ren1->dst_entry,
1019 ren2->dst_entry);
1020 } else {
1021 remove_file(o, 1, ren1_src, 1);
1022 update_stages_and_entry(ren1_dst,
1023 ren1->dst_entry,
1024 ren1->pair->one,
1025 ren1->pair->two,
1026 ren2->pair->two,
1027 1 /* clear */);
1028 }
1029 } else {
1030 /* Renamed in 1, maybe changed in 2 */
1031 struct string_list_item *item;
1032 /* we only use sha1 and mode of these */
1033 struct diff_filespec src_other, dst_other;
1034 int try_merge;
1036 /*
1037 * unpack_trees loads entries from common-commit
1038 * into stage 1, from head-commit into stage 2, and
1039 * from merge-commit into stage 3. We keep track
1040 * of which side corresponds to the rename.
1041 */
1042 int renamed_stage = a_renames == renames1 ? 2 : 3;
1043 int other_stage = a_renames == renames1 ? 3 : 2;
1045 remove_file(o, 1, ren1_src, o->call_depth || renamed_stage == 2);
1047 hashcpy(src_other.sha1, ren1->src_entry->stages[other_stage].sha);
1048 src_other.mode = ren1->src_entry->stages[other_stage].mode;
1049 hashcpy(dst_other.sha1, ren1->dst_entry->stages[other_stage].sha);
1050 dst_other.mode = ren1->dst_entry->stages[other_stage].mode;
1051 try_merge = 0;
1053 if (sha_eq(src_other.sha1, null_sha1)) {
1054 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
1055 ren1->dst_entry->processed = 0;
1056 setup_rename_df_conflict_info(RENAME_DELETE,
1057 ren1->pair,
1058 NULL,
1059 branch1,
1060 branch2,
1061 ren1->dst_entry,
1062 NULL);
1063 } else {
1064 clean_merge = 0;
1065 conflict_rename_delete(o, ren1->pair, branch1, branch2);
1066 }
1067 } else if ((dst_other.mode == ren1->pair->two->mode) &&
1068 sha_eq(dst_other.sha1, ren1->pair->two->sha1)) {
1069 /* Added file on the other side
1070 identical to the file being
1071 renamed: clean merge */
1072 update_file(o, 1, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst);
1073 } else if (!sha_eq(dst_other.sha1, null_sha1)) {
1074 const char *new_path;
1075 clean_merge = 0;
1076 try_merge = 1;
1077 output(o, 1, "CONFLICT (rename/add): Rename %s->%s in %s. "
1078 "%s added in %s",
1079 ren1_src, ren1_dst, branch1,
1080 ren1_dst, branch2);
1081 if (o->call_depth) {
1082 struct merge_file_info mfi;
1083 struct diff_filespec one, a, b;
1085 one.path = a.path = b.path =
1086 (char *)ren1_dst;
1087 hashcpy(one.sha1, null_sha1);
1088 one.mode = 0;
1089 hashcpy(a.sha1, ren1->pair->two->sha1);
1090 a.mode = ren1->pair->two->mode;
1091 hashcpy(b.sha1, dst_other.sha1);
1092 b.mode = dst_other.mode;
1093 mfi = merge_file(o, &one, &a, &b,
1094 branch1,
1095 branch2);
1096 output(o, 1, "Adding merged %s", ren1_dst);
1097 update_file(o, 0,
1098 mfi.sha,
1099 mfi.mode,
1100 ren1_dst);
1101 try_merge = 0;
1102 } else {
1103 new_path = unique_path(o, ren1_dst, branch2);
1104 output(o, 1, "Adding as %s instead", new_path);
1105 update_file(o, 0, dst_other.sha1, dst_other.mode, new_path);
1106 }
1107 } else if ((item = string_list_lookup(renames2Dst, ren1_dst))) {
1108 ren2 = item->util;
1109 clean_merge = 0;
1110 ren2->processed = 1;
1111 output(o, 1, "CONFLICT (rename/rename): "
1112 "Rename %s->%s in %s. "
1113 "Rename %s->%s in %s",
1114 ren1_src, ren1_dst, branch1,
1115 ren2->pair->one->path, ren2->pair->two->path, branch2);
1116 conflict_rename_rename_2to1(o, ren1, branch1, ren2, branch2);
1117 } else
1118 try_merge = 1;
1120 if (try_merge) {
1121 struct diff_filespec *one, *a, *b;
1122 src_other.path = (char *)ren1_src;
1124 one = ren1->pair->one;
1125 if (a_renames == renames1) {
1126 a = ren1->pair->two;
1127 b = &src_other;
1128 } else {
1129 b = ren1->pair->two;
1130 a = &src_other;
1131 }
1132 update_stages_and_entry(ren1_dst, ren1->dst_entry, one, a, b, 1);
1133 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
1134 setup_rename_df_conflict_info(RENAME_NORMAL,
1135 ren1->pair,
1136 NULL,
1137 branch1,
1138 NULL,
1139 ren1->dst_entry,
1140 NULL);
1141 }
1142 }
1143 }
1144 }
1145 string_list_clear(&a_by_dst, 0);
1146 string_list_clear(&b_by_dst, 0);
1148 return clean_merge;
1149 }
1151 static unsigned char *stage_sha(const unsigned char *sha, unsigned mode)
1152 {
1153 return (is_null_sha1(sha) || mode == 0) ? NULL: (unsigned char *)sha;
1154 }
1156 static int read_sha1_strbuf(const unsigned char *sha1, struct strbuf *dst)
1157 {
1158 void *buf;
1159 enum object_type type;
1160 unsigned long size;
1161 buf = read_sha1_file(sha1, &type, &size);
1162 if (!buf)
1163 return error("cannot read object %s", sha1_to_hex(sha1));
1164 if (type != OBJ_BLOB) {
1165 free(buf);
1166 return error("object %s is not a blob", sha1_to_hex(sha1));
1167 }
1168 strbuf_attach(dst, buf, size, size + 1);
1169 return 0;
1170 }
1172 static int blob_unchanged(const unsigned char *o_sha,
1173 const unsigned char *a_sha,
1174 int renormalize, const char *path)
1175 {
1176 struct strbuf o = STRBUF_INIT;
1177 struct strbuf a = STRBUF_INIT;
1178 int ret = 0; /* assume changed for safety */
1180 if (sha_eq(o_sha, a_sha))
1181 return 1;
1182 if (!renormalize)
1183 return 0;
1185 assert(o_sha && a_sha);
1186 if (read_sha1_strbuf(o_sha, &o) || read_sha1_strbuf(a_sha, &a))
1187 goto error_return;
1188 /*
1189 * Note: binary | is used so that both renormalizations are
1190 * performed. Comparison can be skipped if both files are
1191 * unchanged since their sha1s have already been compared.
1192 */
1193 if (renormalize_buffer(path, o.buf, o.len, &o) |
1194 renormalize_buffer(path, a.buf, o.len, &a))
1195 ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len));
1197 error_return:
1198 strbuf_release(&o);
1199 strbuf_release(&a);
1200 return ret;
1201 }
1203 static void handle_delete_modify(struct merge_options *o,
1204 const char *path,
1205 const char *new_path,
1206 unsigned char *a_sha, int a_mode,
1207 unsigned char *b_sha, int b_mode)
1208 {
1209 if (!a_sha) {
1210 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1211 "and modified in %s. Version %s of %s left in tree%s%s.",
1212 path, o->branch1,
1213 o->branch2, o->branch2, path,
1214 path == new_path ? "" : " at ",
1215 path == new_path ? "" : new_path);
1216 update_file(o, 0, b_sha, b_mode, new_path);
1217 } else {
1218 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1219 "and modified in %s. Version %s of %s left in tree%s%s.",
1220 path, o->branch2,
1221 o->branch1, o->branch1, path,
1222 path == new_path ? "" : " at ",
1223 path == new_path ? "" : new_path);
1224 update_file(o, 0, a_sha, a_mode, new_path);
1225 }
1226 }
1228 static int merge_content(struct merge_options *o,
1229 const char *path,
1230 unsigned char *o_sha, int o_mode,
1231 unsigned char *a_sha, int a_mode,
1232 unsigned char *b_sha, int b_mode,
1233 const char *df_rename_conflict_branch)
1234 {
1235 const char *reason = "content";
1236 struct merge_file_info mfi;
1237 struct diff_filespec one, a, b;
1238 struct stat st;
1239 unsigned df_conflict_remains = 0;
1241 if (!o_sha) {
1242 reason = "add/add";
1243 o_sha = (unsigned char *)null_sha1;
1244 }
1245 one.path = a.path = b.path = (char *)path;
1246 hashcpy(one.sha1, o_sha);
1247 one.mode = o_mode;
1248 hashcpy(a.sha1, a_sha);
1249 a.mode = a_mode;
1250 hashcpy(b.sha1, b_sha);
1251 b.mode = b_mode;
1253 mfi = merge_file(o, &one, &a, &b, o->branch1, o->branch2);
1254 if (df_rename_conflict_branch &&
1255 lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1256 df_conflict_remains = 1;
1257 }
1259 if (mfi.clean && !df_conflict_remains &&
1260 sha_eq(mfi.sha, a_sha) && mfi.mode == a.mode)
1261 output(o, 3, "Skipped %s (merged same as existing)", path);
1262 else
1263 output(o, 2, "Auto-merging %s", path);
1265 if (!mfi.clean) {
1266 if (S_ISGITLINK(mfi.mode))
1267 reason = "submodule";
1268 output(o, 1, "CONFLICT (%s): Merge conflict in %s",
1269 reason, path);
1270 }
1272 if (df_conflict_remains) {
1273 const char *new_path;
1274 update_file_flags(o, mfi.sha, mfi.mode, path,
1275 o->call_depth || mfi.clean, 0);
1276 new_path = unique_path(o, path, df_rename_conflict_branch);
1277 mfi.clean = 0;
1278 output(o, 1, "Adding as %s instead", new_path);
1279 update_file_flags(o, mfi.sha, mfi.mode, new_path, 0, 1);
1280 } else {
1281 update_file(o, mfi.clean, mfi.sha, mfi.mode, path);
1282 }
1283 return mfi.clean;
1285 }
1287 /* Per entry merge function */
1288 static int process_entry(struct merge_options *o,
1289 const char *path, struct stage_data *entry)
1290 {
1291 /*
1292 printf("processing entry, clean cache: %s\n", index_only ? "yes": "no");
1293 print_index_entry("\tpath: ", entry);
1294 */
1295 int clean_merge = 1;
1296 int normalize = o->renormalize;
1297 unsigned o_mode = entry->stages[1].mode;
1298 unsigned a_mode = entry->stages[2].mode;
1299 unsigned b_mode = entry->stages[3].mode;
1300 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1301 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1302 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1304 if (entry->rename_df_conflict_info)
1305 return 1; /* Such cases are handled elsewhere. */
1307 entry->processed = 1;
1308 if (o_sha && (!a_sha || !b_sha)) {
1309 /* Case A: Deleted in one */
1310 if ((!a_sha && !b_sha) ||
1311 (!b_sha && blob_unchanged(o_sha, a_sha, normalize, path)) ||
1312 (!a_sha && blob_unchanged(o_sha, b_sha, normalize, path))) {
1313 /* Deleted in both or deleted in one and
1314 * unchanged in the other */
1315 if (a_sha)
1316 output(o, 2, "Removing %s", path);
1317 /* do not touch working file if it did not exist */
1318 remove_file(o, 1, path, !a_sha);
1319 } else if (string_list_has_string(&o->current_directory_set,
1320 path)) {
1321 entry->processed = 0;
1322 return 1; /* Assume clean until processed */
1323 } else {
1324 /* Deleted in one and changed in the other */
1325 clean_merge = 0;
1326 handle_delete_modify(o, path, path,
1327 a_sha, a_mode, b_sha, b_mode);
1328 }
1330 } else if ((!o_sha && a_sha && !b_sha) ||
1331 (!o_sha && !a_sha && b_sha)) {
1332 /* Case B: Added in one. */
1333 unsigned mode;
1334 const unsigned char *sha;
1336 if (a_sha) {
1337 mode = a_mode;
1338 sha = a_sha;
1339 } else {
1340 mode = b_mode;
1341 sha = b_sha;
1342 }
1343 if (string_list_has_string(&o->current_directory_set, path)) {
1344 /* Handle D->F conflicts after all subfiles */
1345 entry->processed = 0;
1346 return 1; /* Assume clean until processed */
1347 } else {
1348 output(o, 2, "Adding %s", path);
1349 update_file(o, 1, sha, mode, path);
1350 }
1351 } else if (a_sha && b_sha) {
1352 /* Case C: Added in both (check for same permissions) and */
1353 /* case D: Modified in both, but differently. */
1354 clean_merge = merge_content(o, path,
1355 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1356 NULL);
1357 } else if (!o_sha && !a_sha && !b_sha) {
1358 /*
1359 * this entry was deleted altogether. a_mode == 0 means
1360 * we had that path and want to actively remove it.
1361 */
1362 remove_file(o, 1, path, !a_mode);
1363 } else
1364 die("Fatal merge failure, shouldn't happen.");
1366 return clean_merge;
1367 }
1369 /*
1370 * Per entry merge function for D/F (and/or rename) conflicts. In the
1371 * cases we can cleanly resolve D/F conflicts, process_entry() can
1372 * clean out all the files below the directory for us. All D/F
1373 * conflict cases must be handled here at the end to make sure any
1374 * directories that can be cleaned out, are.
1375 *
1376 * Some rename conflicts may also be handled here that don't necessarily
1377 * involve D/F conflicts, since the code to handle them is generic enough
1378 * to handle those rename conflicts with or without D/F conflicts also
1379 * being involved.
1380 */
1381 static int process_df_entry(struct merge_options *o,
1382 const char *path, struct stage_data *entry)
1383 {
1384 int clean_merge = 1;
1385 unsigned o_mode = entry->stages[1].mode;
1386 unsigned a_mode = entry->stages[2].mode;
1387 unsigned b_mode = entry->stages[3].mode;
1388 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1389 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1390 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1391 struct stat st;
1393 entry->processed = 1;
1394 if (entry->rename_df_conflict_info) {
1395 struct rename_df_conflict_info *conflict_info = entry->rename_df_conflict_info;
1396 char *src;
1397 switch (conflict_info->rename_type) {
1398 case RENAME_NORMAL:
1399 clean_merge = merge_content(o, path,
1400 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1401 conflict_info->branch1);
1402 break;
1403 case RENAME_DELETE:
1404 clean_merge = 0;
1405 conflict_rename_delete(o, conflict_info->pair1,
1406 conflict_info->branch1,
1407 conflict_info->branch2);
1408 break;
1409 case RENAME_ONE_FILE_TO_TWO:
1410 src = conflict_info->pair1->one->path;
1411 clean_merge = 0;
1412 output(o, 1, "CONFLICT (rename/rename): "
1413 "Rename \"%s\"->\"%s\" in branch \"%s\" "
1414 "rename \"%s\"->\"%s\" in \"%s\"%s",
1415 src, conflict_info->pair1->two->path, conflict_info->branch1,
1416 src, conflict_info->pair2->two->path, conflict_info->branch2,
1417 o->call_depth ? " (left unresolved)" : "");
1418 if (o->call_depth) {
1419 remove_file_from_cache(src);
1420 update_file(o, 0, conflict_info->pair1->one->sha1,
1421 conflict_info->pair1->one->mode, src);
1422 }
1423 conflict_rename_rename_1to2(o, conflict_info->pair1,
1424 conflict_info->branch1,
1425 conflict_info->pair2,
1426 conflict_info->branch2);
1427 conflict_info->dst_entry2->processed = 1;
1428 break;
1429 default:
1430 entry->processed = 0;
1431 break;
1432 }
1433 } else if (o_sha && (!a_sha || !b_sha)) {
1434 /* Modify/delete; deleted side may have put a directory in the way */
1435 const char *new_path = path;
1436 if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode))
1437 new_path = unique_path(o, path, a_sha ? o->branch1 : o->branch2);
1438 clean_merge = 0;
1439 handle_delete_modify(o, path, new_path,
1440 a_sha, a_mode, b_sha, b_mode);
1441 } else if (!o_sha && !!a_sha != !!b_sha) {
1442 /* directory -> (directory, file) */
1443 const char *add_branch;
1444 const char *other_branch;
1445 unsigned mode;
1446 const unsigned char *sha;
1447 const char *conf;
1449 if (a_sha) {
1450 add_branch = o->branch1;
1451 other_branch = o->branch2;
1452 mode = a_mode;
1453 sha = a_sha;
1454 conf = "file/directory";
1455 } else {
1456 add_branch = o->branch2;
1457 other_branch = o->branch1;
1458 mode = b_mode;
1459 sha = b_sha;
1460 conf = "directory/file";
1461 }
1462 if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1463 const char *new_path = unique_path(o, path, add_branch);
1464 clean_merge = 0;
1465 output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. "
1466 "Adding %s as %s",
1467 conf, path, other_branch, path, new_path);
1468 update_file(o, 0, sha, mode, new_path);
1469 } else {
1470 output(o, 2, "Adding %s", path);
1471 update_file(o, 1, sha, mode, path);
1472 }
1473 } else {
1474 entry->processed = 0;
1475 return 1; /* not handled; assume clean until processed */
1476 }
1478 return clean_merge;
1479 }
1481 int merge_trees(struct merge_options *o,
1482 struct tree *head,
1483 struct tree *merge,
1484 struct tree *common,
1485 struct tree **result)
1486 {
1487 int code, clean;
1489 if (o->subtree_shift) {
1490 merge = shift_tree_object(head, merge, o->subtree_shift);
1491 common = shift_tree_object(head, common, o->subtree_shift);
1492 }
1494 if (sha_eq(common->object.sha1, merge->object.sha1)) {
1495 output(o, 0, "Already up-to-date!");
1496 *result = head;
1497 return 1;
1498 }
1500 code = git_merge_trees(o->call_depth, common, head, merge);
1502 if (code != 0) {
1503 if (show(o, 4) || o->call_depth)
1504 die("merging of trees %s and %s failed",
1505 sha1_to_hex(head->object.sha1),
1506 sha1_to_hex(merge->object.sha1));
1507 else
1508 exit(128);
1509 }
1511 if (unmerged_cache()) {
1512 struct string_list *entries, *re_head, *re_merge;
1513 int i;
1514 string_list_clear(&o->current_file_set, 1);
1515 string_list_clear(&o->current_directory_set, 1);
1516 get_files_dirs(o, head);
1517 get_files_dirs(o, merge);
1519 entries = get_unmerged();
1520 make_room_for_directories_of_df_conflicts(o, entries);
1521 re_head = get_renames(o, head, common, head, merge, entries);
1522 re_merge = get_renames(o, merge, common, head, merge, entries);
1523 clean = process_renames(o, re_head, re_merge);
1524 for (i = 0; i < entries->nr; i++) {
1525 const char *path = entries->items[i].string;
1526 struct stage_data *e = entries->items[i].util;
1527 if (!e->processed
1528 && !process_entry(o, path, e))
1529 clean = 0;
1530 }
1531 for (i = 0; i < entries->nr; i++) {
1532 const char *path = entries->items[i].string;
1533 struct stage_data *e = entries->items[i].util;
1534 if (!e->processed
1535 && !process_df_entry(o, path, e))
1536 clean = 0;
1537 }
1538 for (i = 0; i < entries->nr; i++) {
1539 struct stage_data *e = entries->items[i].util;
1540 if (!e->processed)
1541 die("Unprocessed path??? %s",
1542 entries->items[i].string);
1543 }
1545 string_list_clear(re_merge, 0);
1546 string_list_clear(re_head, 0);
1547 string_list_clear(entries, 1);
1549 }
1550 else
1551 clean = 1;
1553 if (o->call_depth)
1554 *result = write_tree_from_memory(o);
1556 return clean;
1557 }
1559 static struct commit_list *reverse_commit_list(struct commit_list *list)
1560 {
1561 struct commit_list *next = NULL, *current, *backup;
1562 for (current = list; current; current = backup) {
1563 backup = current->next;
1564 current->next = next;
1565 next = current;
1566 }
1567 return next;
1568 }
1570 /*
1571 * Merge the commits h1 and h2, return the resulting virtual
1572 * commit object and a flag indicating the cleanness of the merge.
1573 */
1574 int merge_recursive(struct merge_options *o,
1575 struct commit *h1,
1576 struct commit *h2,
1577 struct commit_list *ca,
1578 struct commit **result)
1579 {
1580 struct commit_list *iter;
1581 struct commit *merged_common_ancestors;
1582 struct tree *mrtree = mrtree;
1583 int clean;
1585 if (show(o, 4)) {
1586 output(o, 4, "Merging:");
1587 output_commit_title(o, h1);
1588 output_commit_title(o, h2);
1589 }
1591 if (!ca) {
1592 ca = get_merge_bases(h1, h2, 1);
1593 ca = reverse_commit_list(ca);
1594 }
1596 if (show(o, 5)) {
1597 output(o, 5, "found %u common ancestor(s):", commit_list_count(ca));
1598 for (iter = ca; iter; iter = iter->next)
1599 output_commit_title(o, iter->item);
1600 }
1602 merged_common_ancestors = pop_commit(&ca);
1603 if (merged_common_ancestors == NULL) {
1604 /* if there is no common ancestor, make an empty tree */
1605 struct tree *tree = xcalloc(1, sizeof(struct tree));
1607 tree->object.parsed = 1;
1608 tree->object.type = OBJ_TREE;
1609 pretend_sha1_file(NULL, 0, OBJ_TREE, tree->object.sha1);
1610 merged_common_ancestors = make_virtual_commit(tree, "ancestor");
1611 }
1613 for (iter = ca; iter; iter = iter->next) {
1614 const char *saved_b1, *saved_b2;
1615 o->call_depth++;
1616 /*
1617 * When the merge fails, the result contains files
1618 * with conflict markers. The cleanness flag is
1619 * ignored, it was never actually used, as result of
1620 * merge_trees has always overwritten it: the committed
1621 * "conflicts" were already resolved.
1622 */
1623 discard_cache();
1624 saved_b1 = o->branch1;
1625 saved_b2 = o->branch2;
1626 o->branch1 = "Temporary merge branch 1";
1627 o->branch2 = "Temporary merge branch 2";
1628 merge_recursive(o, merged_common_ancestors, iter->item,
1629 NULL, &merged_common_ancestors);
1630 o->branch1 = saved_b1;
1631 o->branch2 = saved_b2;
1632 o->call_depth--;
1634 if (!merged_common_ancestors)
1635 die("merge returned no commit");
1636 }
1638 discard_cache();
1639 if (!o->call_depth)
1640 read_cache();
1642 o->ancestor = "merged common ancestors";
1643 clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
1644 &mrtree);
1646 if (o->call_depth) {
1647 *result = make_virtual_commit(mrtree, "merged tree");
1648 commit_list_insert(h1, &(*result)->parents);
1649 commit_list_insert(h2, &(*result)->parents->next);
1650 }
1651 flush_output(o);
1652 return clean;
1653 }
1655 static struct commit *get_ref(const unsigned char *sha1, const char *name)
1656 {
1657 struct object *object;
1659 object = deref_tag(parse_object(sha1), name, strlen(name));
1660 if (!object)
1661 return NULL;
1662 if (object->type == OBJ_TREE)
1663 return make_virtual_commit((struct tree*)object, name);
1664 if (object->type != OBJ_COMMIT)
1665 return NULL;
1666 if (parse_commit((struct commit *)object))
1667 return NULL;
1668 return (struct commit *)object;
1669 }
1671 int merge_recursive_generic(struct merge_options *o,
1672 const unsigned char *head,
1673 const unsigned char *merge,
1674 int num_base_list,
1675 const unsigned char **base_list,
1676 struct commit **result)
1677 {
1678 int clean, index_fd;
1679 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
1680 struct commit *head_commit = get_ref(head, o->branch1);
1681 struct commit *next_commit = get_ref(merge, o->branch2);
1682 struct commit_list *ca = NULL;
1684 if (base_list) {
1685 int i;
1686 for (i = 0; i < num_base_list; ++i) {
1687 struct commit *base;
1688 if (!(base = get_ref(base_list[i], sha1_to_hex(base_list[i]))))
1689 return error("Could not parse object '%s'",
1690 sha1_to_hex(base_list[i]));
1691 commit_list_insert(base, &ca);
1692 }
1693 }
1695 index_fd = hold_locked_index(lock, 1);
1696 clean = merge_recursive(o, head_commit, next_commit, ca,
1697 result);
1698 if (active_cache_changed &&
1699 (write_cache(index_fd, active_cache, active_nr) ||
1700 commit_locked_index(lock)))
1701 return error("Unable to write index.");
1703 return clean ? 0 : 1;
1704 }
1706 static int merge_recursive_config(const char *var, const char *value, void *cb)
1707 {
1708 struct merge_options *o = cb;
1709 if (!strcasecmp(var, "merge.verbosity")) {
1710 o->verbosity = git_config_int(var, value);
1711 return 0;
1712 }
1713 if (!strcasecmp(var, "diff.renamelimit")) {
1714 o->diff_rename_limit = git_config_int(var, value);
1715 return 0;
1716 }
1717 if (!strcasecmp(var, "merge.renamelimit")) {
1718 o->merge_rename_limit = git_config_int(var, value);
1719 return 0;
1720 }
1721 return git_xmerge_config(var, value, cb);
1722 }
1724 void init_merge_options(struct merge_options *o)
1725 {
1726 memset(o, 0, sizeof(struct merge_options));
1727 o->verbosity = 2;
1728 o->buffer_output = 1;
1729 o->diff_rename_limit = -1;
1730 o->merge_rename_limit = -1;
1731 o->renormalize = 0;
1732 git_config(merge_recursive_config, o);
1733 if (getenv("GIT_MERGE_VERBOSITY"))
1734 o->verbosity =
1735 strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10);
1736 if (o->verbosity >= 5)
1737 o->buffer_output = 0;
1738 strbuf_init(&o->obuf, 0);
1739 memset(&o->current_file_set, 0, sizeof(struct string_list));
1740 o->current_file_set.strdup_strings = 1;
1741 memset(&o->current_directory_set, 0, sizeof(struct string_list));
1742 o->current_directory_set.strdup_strings = 1;
1743 }
1745 int parse_merge_opt(struct merge_options *o, const char *s)
1746 {
1747 if (!s || !*s)
1748 return -1;
1749 if (!strcmp(s, "ours"))
1750 o->recursive_variant = MERGE_RECURSIVE_OURS;
1751 else if (!strcmp(s, "theirs"))
1752 o->recursive_variant = MERGE_RECURSIVE_THEIRS;
1753 else if (!strcmp(s, "subtree"))
1754 o->subtree_shift = "";
1755 else if (!prefixcmp(s, "subtree="))
1756 o->subtree_shift = s + strlen("subtree=");
1757 else if (!strcmp(s, "patience"))
1758 o->xdl_opts |= XDF_PATIENCE_DIFF;
1759 else if (!strcmp(s, "ignore-space-change"))
1760 o->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
1761 else if (!strcmp(s, "ignore-all-space"))
1762 o->xdl_opts |= XDF_IGNORE_WHITESPACE;
1763 else if (!strcmp(s, "ignore-space-at-eol"))
1764 o->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
1765 else if (!strcmp(s, "renormalize"))
1766 o->renormalize = 1;
1767 else if (!strcmp(s, "no-renormalize"))
1768 o->renormalize = 0;
1769 else if (!prefixcmp(s, "rename-threshold=")) {
1770 const char *score = s + strlen("rename-threshold=");
1771 if ((o->rename_score = parse_rename_score(&score)) == -1 || *score != 0)
1772 return -1;
1773 }
1774 else
1775 return -1;
1776 return 0;
1777 }