standardize brace placement in struct definitions
[git/git.git] / merge-recursive.c
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"
24
25 static struct tree *shift_tree_object(struct tree *one, struct tree *two,
26 const char *subtree_shift)
27 {
28 unsigned char shifted[20];
29
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 }
40
41 /*
42 * A virtual commit has (const char *)commit->util set to the name.
43 */
44
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 }
54
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 }
65
66 enum rename_type {
67 RENAME_NORMAL = 0,
68 RENAME_DELETE,
69 RENAME_ONE_FILE_TO_TWO
70 };
71
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 };
81
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 };
94
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;
108
109 ci->dst_entry1 = dst_entry1;
110 dst_entry1->rename_df_conflict_info = ci;
111 dst_entry1->processed = 0;
112
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 }
121
122 static int show(struct merge_options *o, int v)
123 {
124 return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5;
125 }
126
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 }
134
135 __attribute__((format (printf, 3, 4)))
136 static void output(struct merge_options *o, int v, const char *fmt, ...)
137 {
138 int len;
139 va_list ap;
140
141 if (!show(o, v))
142 return;
143
144 strbuf_grow(&o->obuf, o->call_depth * 2 + 2);
145 memset(o->obuf.buf + o->obuf.len, ' ', o->call_depth * 2);
146 strbuf_setlen(&o->obuf, o->obuf.len + o->call_depth * 2);
147
148 va_start(ap, fmt);
149 len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap);
150 va_end(ap);
151
152 if (len < 0)
153 len = 0;
154 if (len >= strbuf_avail(&o->obuf)) {
155 strbuf_grow(&o->obuf, len + 2);
156 va_start(ap, fmt);
157 len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap);
158 va_end(ap);
159 if (len >= strbuf_avail(&o->obuf)) {
160 die("this should not happen, your snprintf is broken");
161 }
162 }
163 strbuf_setlen(&o->obuf, o->obuf.len + len);
164 strbuf_add(&o->obuf, "\n", 1);
165 if (!o->buffer_output)
166 flush_output(o);
167 }
168
169 static void output_commit_title(struct merge_options *o, struct commit *commit)
170 {
171 int i;
172 flush_output(o);
173 for (i = o->call_depth; i--;)
174 fputs(" ", stdout);
175 if (commit->util)
176 printf("virtual %s\n", (char *)commit->util);
177 else {
178 printf("%s ", find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV));
179 if (parse_commit(commit) != 0)
180 printf("(bad commit)\n");
181 else {
182 const char *title;
183 int len = find_commit_subject(commit->buffer, &title);
184 if (len)
185 printf("%.*s\n", len, title);
186 }
187 }
188 }
189
190 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
191 const char *path, int stage, int refresh, int options)
192 {
193 struct cache_entry *ce;
194 ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage, refresh);
195 if (!ce)
196 return error("addinfo_cache failed for path '%s'", path);
197 return add_cache_entry(ce, options);
198 }
199
200 static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree)
201 {
202 parse_tree(tree);
203 init_tree_desc(desc, tree->buffer, tree->size);
204 }
205
206 static int git_merge_trees(int index_only,
207 struct tree *common,
208 struct tree *head,
209 struct tree *merge)
210 {
211 int rc;
212 struct tree_desc t[3];
213 struct unpack_trees_options opts;
214
215 memset(&opts, 0, sizeof(opts));
216 if (index_only)
217 opts.index_only = 1;
218 else
219 opts.update = 1;
220 opts.merge = 1;
221 opts.head_idx = 2;
222 opts.fn = threeway_merge;
223 opts.src_index = &the_index;
224 opts.dst_index = &the_index;
225 setup_unpack_trees_porcelain(&opts, "merge");
226
227 init_tree_desc_from_tree(t+0, common);
228 init_tree_desc_from_tree(t+1, head);
229 init_tree_desc_from_tree(t+2, merge);
230
231 rc = unpack_trees(3, t, &opts);
232 cache_tree_free(&active_cache_tree);
233 return rc;
234 }
235
236 struct tree *write_tree_from_memory(struct merge_options *o)
237 {
238 struct tree *result = NULL;
239
240 if (unmerged_cache()) {
241 int i;
242 fprintf(stderr, "BUG: There are unmerged index entries:\n");
243 for (i = 0; i < active_nr; i++) {
244 struct cache_entry *ce = active_cache[i];
245 if (ce_stage(ce))
246 fprintf(stderr, "BUG: %d %.*s", ce_stage(ce),
247 (int)ce_namelen(ce), ce->name);
248 }
249 die("Bug in merge-recursive.c");
250 }
251
252 if (!active_cache_tree)
253 active_cache_tree = cache_tree();
254
255 if (!cache_tree_fully_valid(active_cache_tree) &&
256 cache_tree_update(active_cache_tree,
257 active_cache, active_nr, 0, 0) < 0)
258 die("error building trees");
259
260 result = lookup_tree(active_cache_tree->sha1);
261
262 return result;
263 }
264
265 static int save_files_dirs(const unsigned char *sha1,
266 const char *base, int baselen, const char *path,
267 unsigned int mode, int stage, void *context)
268 {
269 int len = strlen(path);
270 char *newpath = xmalloc(baselen + len + 1);
271 struct merge_options *o = context;
272
273 memcpy(newpath, base, baselen);
274 memcpy(newpath + baselen, path, len);
275 newpath[baselen + len] = '\0';
276
277 if (S_ISDIR(mode))
278 string_list_insert(&o->current_directory_set, newpath);
279 else
280 string_list_insert(&o->current_file_set, newpath);
281 free(newpath);
282
283 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
284 }
285
286 static int get_files_dirs(struct merge_options *o, struct tree *tree)
287 {
288 int n;
289 if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs, o))
290 return 0;
291 n = o->current_file_set.nr + o->current_directory_set.nr;
292 return n;
293 }
294
295 /*
296 * Returns an index_entry instance which doesn't have to correspond to
297 * a real cache entry in Git's index.
298 */
299 static struct stage_data *insert_stage_data(const char *path,
300 struct tree *o, struct tree *a, struct tree *b,
301 struct string_list *entries)
302 {
303 struct string_list_item *item;
304 struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
305 get_tree_entry(o->object.sha1, path,
306 e->stages[1].sha, &e->stages[1].mode);
307 get_tree_entry(a->object.sha1, path,
308 e->stages[2].sha, &e->stages[2].mode);
309 get_tree_entry(b->object.sha1, path,
310 e->stages[3].sha, &e->stages[3].mode);
311 item = string_list_insert(entries, path);
312 item->util = e;
313 return e;
314 }
315
316 /*
317 * Create a dictionary mapping file names to stage_data objects. The
318 * dictionary contains one entry for every path with a non-zero stage entry.
319 */
320 static struct string_list *get_unmerged(void)
321 {
322 struct string_list *unmerged = xcalloc(1, sizeof(struct string_list));
323 int i;
324
325 unmerged->strdup_strings = 1;
326
327 for (i = 0; i < active_nr; i++) {
328 struct string_list_item *item;
329 struct stage_data *e;
330 struct cache_entry *ce = active_cache[i];
331 if (!ce_stage(ce))
332 continue;
333
334 item = string_list_lookup(unmerged, ce->name);
335 if (!item) {
336 item = string_list_insert(unmerged, ce->name);
337 item->util = xcalloc(1, sizeof(struct stage_data));
338 }
339 e = item->util;
340 e->stages[ce_stage(ce)].mode = ce->ce_mode;
341 hashcpy(e->stages[ce_stage(ce)].sha, ce->sha1);
342 }
343
344 return unmerged;
345 }
346
347 static void make_room_for_directories_of_df_conflicts(struct merge_options *o,
348 struct string_list *entries)
349 {
350 /* If there are D/F conflicts, and the paths currently exist
351 * in the working copy as a file, we want to remove them to
352 * make room for the corresponding directory. Such paths will
353 * later be processed in process_df_entry() at the end. If
354 * the corresponding directory ends up being removed by the
355 * merge, then the file will be reinstated at that time;
356 * otherwise, if the file is not supposed to be removed by the
357 * merge, the contents of the file will be placed in another
358 * unique filename.
359 *
360 * NOTE: This function relies on the fact that entries for a
361 * D/F conflict will appear adjacent in the index, with the
362 * entries for the file appearing before entries for paths
363 * below the corresponding directory.
364 */
365 const char *last_file = NULL;
366 int last_len = 0;
367 struct stage_data *last_e;
368 int i;
369
370 for (i = 0; i < entries->nr; i++) {
371 const char *path = entries->items[i].string;
372 int len = strlen(path);
373 struct stage_data *e = entries->items[i].util;
374
375 /*
376 * Check if last_file & path correspond to a D/F conflict;
377 * i.e. whether path is last_file+'/'+<something>.
378 * If so, remove last_file to make room for path and friends.
379 */
380 if (last_file &&
381 len > last_len &&
382 memcmp(path, last_file, last_len) == 0 &&
383 path[last_len] == '/') {
384 output(o, 3, "Removing %s to make room for subdirectory; may re-add later.", last_file);
385 unlink(last_file);
386 }
387
388 /*
389 * Determine whether path could exist as a file in the
390 * working directory as a possible D/F conflict. This
391 * will only occur when it exists in stage 2 as a
392 * file.
393 */
394 if (S_ISREG(e->stages[2].mode) || S_ISLNK(e->stages[2].mode)) {
395 last_file = path;
396 last_len = len;
397 last_e = e;
398 } else {
399 last_file = NULL;
400 }
401 }
402 }
403
404 struct rename {
405 struct diff_filepair *pair;
406 struct stage_data *src_entry;
407 struct stage_data *dst_entry;
408 unsigned processed:1;
409 };
410
411 /*
412 * Get information of all renames which occurred between 'o_tree' and
413 * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
414 * 'b_tree') to be able to associate the correct cache entries with
415 * the rename information. 'tree' is always equal to either a_tree or b_tree.
416 */
417 static struct string_list *get_renames(struct merge_options *o,
418 struct tree *tree,
419 struct tree *o_tree,
420 struct tree *a_tree,
421 struct tree *b_tree,
422 struct string_list *entries)
423 {
424 int i;
425 struct string_list *renames;
426 struct diff_options opts;
427
428 renames = xcalloc(1, sizeof(struct string_list));
429 diff_setup(&opts);
430 DIFF_OPT_SET(&opts, RECURSIVE);
431 opts.detect_rename = DIFF_DETECT_RENAME;
432 opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
433 o->diff_rename_limit >= 0 ? o->diff_rename_limit :
434 500;
435 opts.rename_score = o->rename_score;
436 opts.warn_on_too_large_rename = 1;
437 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
438 if (diff_setup_done(&opts) < 0)
439 die("diff setup failed");
440 diff_tree_sha1(o_tree->object.sha1, tree->object.sha1, "", &opts);
441 diffcore_std(&opts);
442 for (i = 0; i < diff_queued_diff.nr; ++i) {
443 struct string_list_item *item;
444 struct rename *re;
445 struct diff_filepair *pair = diff_queued_diff.queue[i];
446 if (pair->status != 'R') {
447 diff_free_filepair(pair);
448 continue;
449 }
450 re = xmalloc(sizeof(*re));
451 re->processed = 0;
452 re->pair = pair;
453 item = string_list_lookup(entries, re->pair->one->path);
454 if (!item)
455 re->src_entry = insert_stage_data(re->pair->one->path,
456 o_tree, a_tree, b_tree, entries);
457 else
458 re->src_entry = item->util;
459
460 item = string_list_lookup(entries, re->pair->two->path);
461 if (!item)
462 re->dst_entry = insert_stage_data(re->pair->two->path,
463 o_tree, a_tree, b_tree, entries);
464 else
465 re->dst_entry = item->util;
466 item = string_list_insert(renames, pair->one->path);
467 item->util = re;
468 }
469 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
470 diff_queued_diff.nr = 0;
471 diff_flush(&opts);
472 return renames;
473 }
474
475 static int update_stages_options(const char *path, struct diff_filespec *o,
476 struct diff_filespec *a, struct diff_filespec *b,
477 int clear, int options)
478 {
479 if (clear)
480 if (remove_file_from_cache(path))
481 return -1;
482 if (o)
483 if (add_cacheinfo(o->mode, o->sha1, path, 1, 0, options))
484 return -1;
485 if (a)
486 if (add_cacheinfo(a->mode, a->sha1, path, 2, 0, options))
487 return -1;
488 if (b)
489 if (add_cacheinfo(b->mode, b->sha1, path, 3, 0, options))
490 return -1;
491 return 0;
492 }
493
494 static int update_stages(const char *path, struct diff_filespec *o,
495 struct diff_filespec *a, struct diff_filespec *b,
496 int clear)
497 {
498 int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE;
499 return update_stages_options(path, o, a, b, clear, options);
500 }
501
502 static int update_stages_and_entry(const char *path,
503 struct stage_data *entry,
504 struct diff_filespec *o,
505 struct diff_filespec *a,
506 struct diff_filespec *b,
507 int clear)
508 {
509 int options;
510
511 entry->processed = 0;
512 entry->stages[1].mode = o->mode;
513 entry->stages[2].mode = a->mode;
514 entry->stages[3].mode = b->mode;
515 hashcpy(entry->stages[1].sha, o->sha1);
516 hashcpy(entry->stages[2].sha, a->sha1);
517 hashcpy(entry->stages[3].sha, b->sha1);
518 options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_SKIP_DFCHECK;
519 return update_stages_options(path, o, a, b, clear, options);
520 }
521
522 static int remove_file(struct merge_options *o, int clean,
523 const char *path, int no_wd)
524 {
525 int update_cache = o->call_depth || clean;
526 int update_working_directory = !o->call_depth && !no_wd;
527
528 if (update_cache) {
529 if (remove_file_from_cache(path))
530 return -1;
531 }
532 if (update_working_directory) {
533 if (remove_path(path))
534 return -1;
535 }
536 return 0;
537 }
538
539 static char *unique_path(struct merge_options *o, const char *path, const char *branch)
540 {
541 char *newpath = xmalloc(strlen(path) + 1 + strlen(branch) + 8 + 1);
542 int suffix = 0;
543 struct stat st;
544 char *p = newpath + strlen(path);
545 strcpy(newpath, path);
546 *(p++) = '~';
547 strcpy(p, branch);
548 for (; *p; ++p)
549 if ('/' == *p)
550 *p = '_';
551 while (string_list_has_string(&o->current_file_set, newpath) ||
552 string_list_has_string(&o->current_directory_set, newpath) ||
553 lstat(newpath, &st) == 0)
554 sprintf(p, "_%d", suffix++);
555
556 string_list_insert(&o->current_file_set, newpath);
557 return newpath;
558 }
559
560 static void flush_buffer(int fd, const char *buf, unsigned long size)
561 {
562 while (size > 0) {
563 long ret = write_in_full(fd, buf, size);
564 if (ret < 0) {
565 /* Ignore epipe */
566 if (errno == EPIPE)
567 break;
568 die_errno("merge-recursive");
569 } else if (!ret) {
570 die("merge-recursive: disk full?");
571 }
572 size -= ret;
573 buf += ret;
574 }
575 }
576
577 static int would_lose_untracked(const char *path)
578 {
579 int pos = cache_name_pos(path, strlen(path));
580
581 if (pos < 0)
582 pos = -1 - pos;
583 while (pos < active_nr &&
584 !strcmp(path, active_cache[pos]->name)) {
585 /*
586 * If stage #0, it is definitely tracked.
587 * If it has stage #2 then it was tracked
588 * before this merge started. All other
589 * cases the path was not tracked.
590 */
591 switch (ce_stage(active_cache[pos])) {
592 case 0:
593 case 2:
594 return 0;
595 }
596 pos++;
597 }
598 return file_exists(path);
599 }
600
601 static int make_room_for_path(const char *path)
602 {
603 int status;
604 const char *msg = "failed to create path '%s'%s";
605
606 status = safe_create_leading_directories_const(path);
607 if (status) {
608 if (status == -3) {
609 /* something else exists */
610 error(msg, path, ": perhaps a D/F conflict?");
611 return -1;
612 }
613 die(msg, path, "");
614 }
615
616 /*
617 * Do not unlink a file in the work tree if we are not
618 * tracking it.
619 */
620 if (would_lose_untracked(path))
621 return error("refusing to lose untracked file at '%s'",
622 path);
623
624 /* Successful unlink is good.. */
625 if (!unlink(path))
626 return 0;
627 /* .. and so is no existing file */
628 if (errno == ENOENT)
629 return 0;
630 /* .. but not some other error (who really cares what?) */
631 return error(msg, path, ": perhaps a D/F conflict?");
632 }
633
634 static void update_file_flags(struct merge_options *o,
635 const unsigned char *sha,
636 unsigned mode,
637 const char *path,
638 int update_cache,
639 int update_wd)
640 {
641 if (o->call_depth)
642 update_wd = 0;
643
644 if (update_wd) {
645 enum object_type type;
646 void *buf;
647 unsigned long size;
648
649 if (S_ISGITLINK(mode)) {
650 /*
651 * We may later decide to recursively descend into
652 * the submodule directory and update its index
653 * and/or work tree, but we do not do that now.
654 */
655 update_wd = 0;
656 goto update_index;
657 }
658
659 buf = read_sha1_file(sha, &type, &size);
660 if (!buf)
661 die("cannot read object %s '%s'", sha1_to_hex(sha), path);
662 if (type != OBJ_BLOB)
663 die("blob expected for %s '%s'", sha1_to_hex(sha), path);
664 if (S_ISREG(mode)) {
665 struct strbuf strbuf = STRBUF_INIT;
666 if (convert_to_working_tree(path, buf, size, &strbuf)) {
667 free(buf);
668 size = strbuf.len;
669 buf = strbuf_detach(&strbuf, NULL);
670 }
671 }
672
673 if (make_room_for_path(path) < 0) {
674 update_wd = 0;
675 free(buf);
676 goto update_index;
677 }
678 if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
679 int fd;
680 if (mode & 0100)
681 mode = 0777;
682 else
683 mode = 0666;
684 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
685 if (fd < 0)
686 die_errno("failed to open '%s'", path);
687 flush_buffer(fd, buf, size);
688 close(fd);
689 } else if (S_ISLNK(mode)) {
690 char *lnk = xmemdupz(buf, size);
691 safe_create_leading_directories_const(path);
692 unlink(path);
693 if (symlink(lnk, path))
694 die_errno("failed to symlink '%s'", path);
695 free(lnk);
696 } else
697 die("do not know what to do with %06o %s '%s'",
698 mode, sha1_to_hex(sha), path);
699 free(buf);
700 }
701 update_index:
702 if (update_cache)
703 add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
704 }
705
706 static void update_file(struct merge_options *o,
707 int clean,
708 const unsigned char *sha,
709 unsigned mode,
710 const char *path)
711 {
712 update_file_flags(o, sha, mode, path, o->call_depth || clean, !o->call_depth);
713 }
714
715 /* Low level file merging, update and removal */
716
717 struct merge_file_info {
718 unsigned char sha[20];
719 unsigned mode;
720 unsigned clean:1,
721 merge:1;
722 };
723
724 static int merge_3way(struct merge_options *o,
725 mmbuffer_t *result_buf,
726 struct diff_filespec *one,
727 struct diff_filespec *a,
728 struct diff_filespec *b,
729 const char *branch1,
730 const char *branch2)
731 {
732 mmfile_t orig, src1, src2;
733 struct ll_merge_options ll_opts = {0};
734 char *base_name, *name1, *name2;
735 int merge_status;
736
737 ll_opts.renormalize = o->renormalize;
738 ll_opts.xdl_opts = o->xdl_opts;
739
740 if (o->call_depth) {
741 ll_opts.virtual_ancestor = 1;
742 ll_opts.variant = 0;
743 } else {
744 switch (o->recursive_variant) {
745 case MERGE_RECURSIVE_OURS:
746 ll_opts.variant = XDL_MERGE_FAVOR_OURS;
747 break;
748 case MERGE_RECURSIVE_THEIRS:
749 ll_opts.variant = XDL_MERGE_FAVOR_THEIRS;
750 break;
751 default:
752 ll_opts.variant = 0;
753 break;
754 }
755 }
756
757 if (strcmp(a->path, b->path) ||
758 (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) {
759 base_name = o->ancestor == NULL ? NULL :
760 xstrdup(mkpath("%s:%s", o->ancestor, one->path));
761 name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
762 name2 = xstrdup(mkpath("%s:%s", branch2, b->path));
763 } else {
764 base_name = o->ancestor == NULL ? NULL :
765 xstrdup(mkpath("%s", o->ancestor));
766 name1 = xstrdup(mkpath("%s", branch1));
767 name2 = xstrdup(mkpath("%s", branch2));
768 }
769
770 read_mmblob(&orig, one->sha1);
771 read_mmblob(&src1, a->sha1);
772 read_mmblob(&src2, b->sha1);
773
774 merge_status = ll_merge(result_buf, a->path, &orig, base_name,
775 &src1, name1, &src2, name2, &ll_opts);
776
777 free(name1);
778 free(name2);
779 free(orig.ptr);
780 free(src1.ptr);
781 free(src2.ptr);
782 return merge_status;
783 }
784
785 static struct merge_file_info merge_file(struct merge_options *o,
786 struct diff_filespec *one,
787 struct diff_filespec *a,
788 struct diff_filespec *b,
789 const char *branch1,
790 const char *branch2)
791 {
792 struct merge_file_info result;
793 result.merge = 0;
794 result.clean = 1;
795
796 if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) {
797 result.clean = 0;
798 if (S_ISREG(a->mode)) {
799 result.mode = a->mode;
800 hashcpy(result.sha, a->sha1);
801 } else {
802 result.mode = b->mode;
803 hashcpy(result.sha, b->sha1);
804 }
805 } else {
806 if (!sha_eq(a->sha1, one->sha1) && !sha_eq(b->sha1, one->sha1))
807 result.merge = 1;
808
809 /*
810 * Merge modes
811 */
812 if (a->mode == b->mode || a->mode == one->mode)
813 result.mode = b->mode;
814 else {
815 result.mode = a->mode;
816 if (b->mode != one->mode) {
817 result.clean = 0;
818 result.merge = 1;
819 }
820 }
821
822 if (sha_eq(a->sha1, b->sha1) || sha_eq(a->sha1, one->sha1))
823 hashcpy(result.sha, b->sha1);
824 else if (sha_eq(b->sha1, one->sha1))
825 hashcpy(result.sha, a->sha1);
826 else if (S_ISREG(a->mode)) {
827 mmbuffer_t result_buf;
828 int merge_status;
829
830 merge_status = merge_3way(o, &result_buf, one, a, b,
831 branch1, branch2);
832
833 if ((merge_status < 0) || !result_buf.ptr)
834 die("Failed to execute internal merge");
835
836 if (write_sha1_file(result_buf.ptr, result_buf.size,
837 blob_type, result.sha))
838 die("Unable to add %s to database",
839 a->path);
840
841 free(result_buf.ptr);
842 result.clean = (merge_status == 0);
843 } else if (S_ISGITLINK(a->mode)) {
844 result.clean = merge_submodule(result.sha, one->path, one->sha1,
845 a->sha1, b->sha1);
846 } else if (S_ISLNK(a->mode)) {
847 hashcpy(result.sha, a->sha1);
848
849 if (!sha_eq(a->sha1, b->sha1))
850 result.clean = 0;
851 } else {
852 die("unsupported object type in the tree");
853 }
854 }
855
856 return result;
857 }
858
859 static void conflict_rename_delete(struct merge_options *o,
860 struct diff_filepair *pair,
861 const char *rename_branch,
862 const char *other_branch)
863 {
864 char *dest_name = pair->two->path;
865 int df_conflict = 0;
866 struct stat st;
867
868 output(o, 1, "CONFLICT (rename/delete): Rename %s->%s in %s "
869 "and deleted in %s",
870 pair->one->path, pair->two->path, rename_branch,
871 other_branch);
872 if (!o->call_depth)
873 update_stages(dest_name, NULL,
874 rename_branch == o->branch1 ? pair->two : NULL,
875 rename_branch == o->branch1 ? NULL : pair->two,
876 1);
877 if (lstat(dest_name, &st) == 0 && S_ISDIR(st.st_mode)) {
878 dest_name = unique_path(o, dest_name, rename_branch);
879 df_conflict = 1;
880 }
881 update_file(o, 0, pair->two->sha1, pair->two->mode, dest_name);
882 if (df_conflict)
883 free(dest_name);
884 }
885
886 static void conflict_rename_rename_1to2(struct merge_options *o,
887 struct diff_filepair *pair1,
888 const char *branch1,
889 struct diff_filepair *pair2,
890 const char *branch2)
891 {
892 /* One file was renamed in both branches, but to different names. */
893 char *del[2];
894 int delp = 0;
895 const char *ren1_dst = pair1->two->path;
896 const char *ren2_dst = pair2->two->path;
897 const char *dst_name1 = ren1_dst;
898 const char *dst_name2 = ren2_dst;
899 struct stat st;
900 if (lstat(ren1_dst, &st) == 0 && S_ISDIR(st.st_mode)) {
901 dst_name1 = del[delp++] = unique_path(o, ren1_dst, branch1);
902 output(o, 1, "%s is a directory in %s adding as %s instead",
903 ren1_dst, branch2, dst_name1);
904 }
905 if (lstat(ren2_dst, &st) == 0 && S_ISDIR(st.st_mode)) {
906 dst_name2 = del[delp++] = unique_path(o, ren2_dst, branch2);
907 output(o, 1, "%s is a directory in %s adding as %s instead",
908 ren2_dst, branch1, dst_name2);
909 }
910 if (o->call_depth) {
911 remove_file_from_cache(dst_name1);
912 remove_file_from_cache(dst_name2);
913 /*
914 * Uncomment to leave the conflicting names in the resulting tree
915 *
916 * update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1);
917 * update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2);
918 */
919 } else {
920 update_stages(ren1_dst, NULL, pair1->two, NULL, 1);
921 update_stages(ren2_dst, NULL, NULL, pair2->two, 1);
922
923 update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1);
924 update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2);
925 }
926 while (delp--)
927 free(del[delp]);
928 }
929
930 static void conflict_rename_rename_2to1(struct merge_options *o,
931 struct rename *ren1,
932 const char *branch1,
933 struct rename *ren2,
934 const char *branch2)
935 {
936 /* Two files were renamed to the same thing. */
937 char *new_path1 = unique_path(o, ren1->pair->two->path, branch1);
938 char *new_path2 = unique_path(o, ren2->pair->two->path, branch2);
939 output(o, 1, "Renaming %s to %s and %s to %s instead",
940 ren1->pair->one->path, new_path1,
941 ren2->pair->one->path, new_path2);
942 remove_file(o, 0, ren1->pair->two->path, 0);
943 update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path1);
944 update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, new_path2);
945 free(new_path2);
946 free(new_path1);
947 }
948
949 static int process_renames(struct merge_options *o,
950 struct string_list *a_renames,
951 struct string_list *b_renames)
952 {
953 int clean_merge = 1, i, j;
954 struct string_list a_by_dst = STRING_LIST_INIT_NODUP;
955 struct string_list b_by_dst = STRING_LIST_INIT_NODUP;
956 const struct rename *sre;
957
958 for (i = 0; i < a_renames->nr; i++) {
959 sre = a_renames->items[i].util;
960 string_list_insert(&a_by_dst, sre->pair->two->path)->util
961 = sre->dst_entry;
962 }
963 for (i = 0; i < b_renames->nr; i++) {
964 sre = b_renames->items[i].util;
965 string_list_insert(&b_by_dst, sre->pair->two->path)->util
966 = sre->dst_entry;
967 }
968
969 for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
970 char *src;
971 struct string_list *renames1, *renames2Dst;
972 struct rename *ren1 = NULL, *ren2 = NULL;
973 const char *branch1, *branch2;
974 const char *ren1_src, *ren1_dst;
975
976 if (i >= a_renames->nr) {
977 ren2 = b_renames->items[j++].util;
978 } else if (j >= b_renames->nr) {
979 ren1 = a_renames->items[i++].util;
980 } else {
981 int compare = strcmp(a_renames->items[i].string,
982 b_renames->items[j].string);
983 if (compare <= 0)
984 ren1 = a_renames->items[i++].util;
985 if (compare >= 0)
986 ren2 = b_renames->items[j++].util;
987 }
988
989 /* TODO: refactor, so that 1/2 are not needed */
990 if (ren1) {
991 renames1 = a_renames;
992 renames2Dst = &b_by_dst;
993 branch1 = o->branch1;
994 branch2 = o->branch2;
995 } else {
996 struct rename *tmp;
997 renames1 = b_renames;
998 renames2Dst = &a_by_dst;
999 branch1 = o->branch2;
1000 branch2 = o->branch1;
1001 tmp = ren2;
1002 ren2 = ren1;
1003 ren1 = tmp;
1004 }
1005 src = ren1->pair->one->path;
1006
1007 ren1->dst_entry->processed = 1;
1008 ren1->src_entry->processed = 1;
1009
1010 if (ren1->processed)
1011 continue;
1012 ren1->processed = 1;
1013
1014 ren1_src = ren1->pair->one->path;
1015 ren1_dst = ren1->pair->two->path;
1016
1017 if (ren2) {
1018 const char *ren2_src = ren2->pair->one->path;
1019 const char *ren2_dst = ren2->pair->two->path;
1020 /* Renamed in 1 and renamed in 2 */
1021 if (strcmp(ren1_src, ren2_src) != 0)
1022 die("ren1.src != ren2.src");
1023 ren2->dst_entry->processed = 1;
1024 ren2->processed = 1;
1025 if (strcmp(ren1_dst, ren2_dst) != 0) {
1026 setup_rename_df_conflict_info(RENAME_ONE_FILE_TO_TWO,
1027 ren1->pair,
1028 ren2->pair,
1029 branch1,
1030 branch2,
1031 ren1->dst_entry,
1032 ren2->dst_entry);
1033 } else {
1034 remove_file(o, 1, ren1_src, 1);
1035 update_stages_and_entry(ren1_dst,
1036 ren1->dst_entry,
1037 ren1->pair->one,
1038 ren1->pair->two,
1039 ren2->pair->two,
1040 1 /* clear */);
1041 }
1042 } else {
1043 /* Renamed in 1, maybe changed in 2 */
1044 struct string_list_item *item;
1045 /* we only use sha1 and mode of these */
1046 struct diff_filespec src_other, dst_other;
1047 int try_merge;
1048
1049 /*
1050 * unpack_trees loads entries from common-commit
1051 * into stage 1, from head-commit into stage 2, and
1052 * from merge-commit into stage 3. We keep track
1053 * of which side corresponds to the rename.
1054 */
1055 int renamed_stage = a_renames == renames1 ? 2 : 3;
1056 int other_stage = a_renames == renames1 ? 3 : 2;
1057
1058 remove_file(o, 1, ren1_src, o->call_depth || renamed_stage == 2);
1059
1060 hashcpy(src_other.sha1, ren1->src_entry->stages[other_stage].sha);
1061 src_other.mode = ren1->src_entry->stages[other_stage].mode;
1062 hashcpy(dst_other.sha1, ren1->dst_entry->stages[other_stage].sha);
1063 dst_other.mode = ren1->dst_entry->stages[other_stage].mode;
1064 try_merge = 0;
1065
1066 if (sha_eq(src_other.sha1, null_sha1)) {
1067 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
1068 ren1->dst_entry->processed = 0;
1069 setup_rename_df_conflict_info(RENAME_DELETE,
1070 ren1->pair,
1071 NULL,
1072 branch1,
1073 branch2,
1074 ren1->dst_entry,
1075 NULL);
1076 } else {
1077 clean_merge = 0;
1078 conflict_rename_delete(o, ren1->pair, branch1, branch2);
1079 }
1080 } else if ((dst_other.mode == ren1->pair->two->mode) &&
1081 sha_eq(dst_other.sha1, ren1->pair->two->sha1)) {
1082 /* Added file on the other side
1083 identical to the file being
1084 renamed: clean merge */
1085 update_file(o, 1, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst);
1086 } else if (!sha_eq(dst_other.sha1, null_sha1)) {
1087 const char *new_path;
1088 clean_merge = 0;
1089 try_merge = 1;
1090 output(o, 1, "CONFLICT (rename/add): Rename %s->%s in %s. "
1091 "%s added in %s",
1092 ren1_src, ren1_dst, branch1,
1093 ren1_dst, branch2);
1094 if (o->call_depth) {
1095 struct merge_file_info mfi;
1096 struct diff_filespec one, a, b;
1097
1098 one.path = a.path = b.path =
1099 (char *)ren1_dst;
1100 hashcpy(one.sha1, null_sha1);
1101 one.mode = 0;
1102 hashcpy(a.sha1, ren1->pair->two->sha1);
1103 a.mode = ren1->pair->two->mode;
1104 hashcpy(b.sha1, dst_other.sha1);
1105 b.mode = dst_other.mode;
1106 mfi = merge_file(o, &one, &a, &b,
1107 branch1,
1108 branch2);
1109 output(o, 1, "Adding merged %s", ren1_dst);
1110 update_file(o, 0,
1111 mfi.sha,
1112 mfi.mode,
1113 ren1_dst);
1114 try_merge = 0;
1115 } else {
1116 new_path = unique_path(o, ren1_dst, branch2);
1117 output(o, 1, "Adding as %s instead", new_path);
1118 update_file(o, 0, dst_other.sha1, dst_other.mode, new_path);
1119 }
1120 } else if ((item = string_list_lookup(renames2Dst, ren1_dst))) {
1121 ren2 = item->util;
1122 clean_merge = 0;
1123 ren2->processed = 1;
1124 output(o, 1, "CONFLICT (rename/rename): "
1125 "Rename %s->%s in %s. "
1126 "Rename %s->%s in %s",
1127 ren1_src, ren1_dst, branch1,
1128 ren2->pair->one->path, ren2->pair->two->path, branch2);
1129 conflict_rename_rename_2to1(o, ren1, branch1, ren2, branch2);
1130 } else
1131 try_merge = 1;
1132
1133 if (try_merge) {
1134 struct diff_filespec *one, *a, *b;
1135 src_other.path = (char *)ren1_src;
1136
1137 one = ren1->pair->one;
1138 if (a_renames == renames1) {
1139 a = ren1->pair->two;
1140 b = &src_other;
1141 } else {
1142 b = ren1->pair->two;
1143 a = &src_other;
1144 }
1145 update_stages_and_entry(ren1_dst, ren1->dst_entry, one, a, b, 1);
1146 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
1147 setup_rename_df_conflict_info(RENAME_NORMAL,
1148 ren1->pair,
1149 NULL,
1150 branch1,
1151 NULL,
1152 ren1->dst_entry,
1153 NULL);
1154 }
1155 }
1156 }
1157 }
1158 string_list_clear(&a_by_dst, 0);
1159 string_list_clear(&b_by_dst, 0);
1160
1161 return clean_merge;
1162 }
1163
1164 static unsigned char *stage_sha(const unsigned char *sha, unsigned mode)
1165 {
1166 return (is_null_sha1(sha) || mode == 0) ? NULL: (unsigned char *)sha;
1167 }
1168
1169 static int read_sha1_strbuf(const unsigned char *sha1, struct strbuf *dst)
1170 {
1171 void *buf;
1172 enum object_type type;
1173 unsigned long size;
1174 buf = read_sha1_file(sha1, &type, &size);
1175 if (!buf)
1176 return error("cannot read object %s", sha1_to_hex(sha1));
1177 if (type != OBJ_BLOB) {
1178 free(buf);
1179 return error("object %s is not a blob", sha1_to_hex(sha1));
1180 }
1181 strbuf_attach(dst, buf, size, size + 1);
1182 return 0;
1183 }
1184
1185 static int blob_unchanged(const unsigned char *o_sha,
1186 const unsigned char *a_sha,
1187 int renormalize, const char *path)
1188 {
1189 struct strbuf o = STRBUF_INIT;
1190 struct strbuf a = STRBUF_INIT;
1191 int ret = 0; /* assume changed for safety */
1192
1193 if (sha_eq(o_sha, a_sha))
1194 return 1;
1195 if (!renormalize)
1196 return 0;
1197
1198 assert(o_sha && a_sha);
1199 if (read_sha1_strbuf(o_sha, &o) || read_sha1_strbuf(a_sha, &a))
1200 goto error_return;
1201 /*
1202 * Note: binary | is used so that both renormalizations are
1203 * performed. Comparison can be skipped if both files are
1204 * unchanged since their sha1s have already been compared.
1205 */
1206 if (renormalize_buffer(path, o.buf, o.len, &o) |
1207 renormalize_buffer(path, a.buf, o.len, &a))
1208 ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len));
1209
1210 error_return:
1211 strbuf_release(&o);
1212 strbuf_release(&a);
1213 return ret;
1214 }
1215
1216 static void handle_delete_modify(struct merge_options *o,
1217 const char *path,
1218 const char *new_path,
1219 unsigned char *a_sha, int a_mode,
1220 unsigned char *b_sha, int b_mode)
1221 {
1222 if (!a_sha) {
1223 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1224 "and modified in %s. Version %s of %s left in tree%s%s.",
1225 path, o->branch1,
1226 o->branch2, o->branch2, path,
1227 path == new_path ? "" : " at ",
1228 path == new_path ? "" : new_path);
1229 update_file(o, 0, b_sha, b_mode, new_path);
1230 } else {
1231 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1232 "and modified in %s. Version %s of %s left in tree%s%s.",
1233 path, o->branch2,
1234 o->branch1, o->branch1, path,
1235 path == new_path ? "" : " at ",
1236 path == new_path ? "" : new_path);
1237 update_file(o, 0, a_sha, a_mode, new_path);
1238 }
1239 }
1240
1241 static int merge_content(struct merge_options *o,
1242 const char *path,
1243 unsigned char *o_sha, int o_mode,
1244 unsigned char *a_sha, int a_mode,
1245 unsigned char *b_sha, int b_mode,
1246 const char *df_rename_conflict_branch)
1247 {
1248 const char *reason = "content";
1249 struct merge_file_info mfi;
1250 struct diff_filespec one, a, b;
1251 struct stat st;
1252 unsigned df_conflict_remains = 0;
1253
1254 if (!o_sha) {
1255 reason = "add/add";
1256 o_sha = (unsigned char *)null_sha1;
1257 }
1258 one.path = a.path = b.path = (char *)path;
1259 hashcpy(one.sha1, o_sha);
1260 one.mode = o_mode;
1261 hashcpy(a.sha1, a_sha);
1262 a.mode = a_mode;
1263 hashcpy(b.sha1, b_sha);
1264 b.mode = b_mode;
1265
1266 mfi = merge_file(o, &one, &a, &b, o->branch1, o->branch2);
1267 if (df_rename_conflict_branch &&
1268 lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1269 df_conflict_remains = 1;
1270 }
1271
1272 if (mfi.clean && !df_conflict_remains &&
1273 sha_eq(mfi.sha, a_sha) && mfi.mode == a.mode)
1274 output(o, 3, "Skipped %s (merged same as existing)", path);
1275 else
1276 output(o, 2, "Auto-merging %s", path);
1277
1278 if (!mfi.clean) {
1279 if (S_ISGITLINK(mfi.mode))
1280 reason = "submodule";
1281 output(o, 1, "CONFLICT (%s): Merge conflict in %s",
1282 reason, path);
1283 }
1284
1285 if (df_conflict_remains) {
1286 const char *new_path;
1287 update_file_flags(o, mfi.sha, mfi.mode, path,
1288 o->call_depth || mfi.clean, 0);
1289 new_path = unique_path(o, path, df_rename_conflict_branch);
1290 mfi.clean = 0;
1291 output(o, 1, "Adding as %s instead", new_path);
1292 update_file_flags(o, mfi.sha, mfi.mode, new_path, 0, 1);
1293 } else {
1294 update_file(o, mfi.clean, mfi.sha, mfi.mode, path);
1295 }
1296 return mfi.clean;
1297
1298 }
1299
1300 /* Per entry merge function */
1301 static int process_entry(struct merge_options *o,
1302 const char *path, struct stage_data *entry)
1303 {
1304 /*
1305 printf("processing entry, clean cache: %s\n", index_only ? "yes": "no");
1306 print_index_entry("\tpath: ", entry);
1307 */
1308 int clean_merge = 1;
1309 int normalize = o->renormalize;
1310 unsigned o_mode = entry->stages[1].mode;
1311 unsigned a_mode = entry->stages[2].mode;
1312 unsigned b_mode = entry->stages[3].mode;
1313 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1314 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1315 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1316
1317 if (entry->rename_df_conflict_info)
1318 return 1; /* Such cases are handled elsewhere. */
1319
1320 entry->processed = 1;
1321 if (o_sha && (!a_sha || !b_sha)) {
1322 /* Case A: Deleted in one */
1323 if ((!a_sha && !b_sha) ||
1324 (!b_sha && blob_unchanged(o_sha, a_sha, normalize, path)) ||
1325 (!a_sha && blob_unchanged(o_sha, b_sha, normalize, path))) {
1326 /* Deleted in both or deleted in one and
1327 * unchanged in the other */
1328 if (a_sha)
1329 output(o, 2, "Removing %s", path);
1330 /* do not touch working file if it did not exist */
1331 remove_file(o, 1, path, !a_sha);
1332 } else if (string_list_has_string(&o->current_directory_set,
1333 path)) {
1334 entry->processed = 0;
1335 return 1; /* Assume clean until processed */
1336 } else {
1337 /* Deleted in one and changed in the other */
1338 clean_merge = 0;
1339 handle_delete_modify(o, path, path,
1340 a_sha, a_mode, b_sha, b_mode);
1341 }
1342
1343 } else if ((!o_sha && a_sha && !b_sha) ||
1344 (!o_sha && !a_sha && b_sha)) {
1345 /* Case B: Added in one. */
1346 unsigned mode;
1347 const unsigned char *sha;
1348
1349 if (a_sha) {
1350 mode = a_mode;
1351 sha = a_sha;
1352 } else {
1353 mode = b_mode;
1354 sha = b_sha;
1355 }
1356 if (string_list_has_string(&o->current_directory_set, path)) {
1357 /* Handle D->F conflicts after all subfiles */
1358 entry->processed = 0;
1359 return 1; /* Assume clean until processed */
1360 } else {
1361 output(o, 2, "Adding %s", path);
1362 update_file(o, 1, sha, mode, path);
1363 }
1364 } else if (a_sha && b_sha) {
1365 /* Case C: Added in both (check for same permissions) and */
1366 /* case D: Modified in both, but differently. */
1367 clean_merge = merge_content(o, path,
1368 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1369 NULL);
1370 } else if (!o_sha && !a_sha && !b_sha) {
1371 /*
1372 * this entry was deleted altogether. a_mode == 0 means
1373 * we had that path and want to actively remove it.
1374 */
1375 remove_file(o, 1, path, !a_mode);
1376 } else
1377 die("Fatal merge failure, shouldn't happen.");
1378
1379 return clean_merge;
1380 }
1381
1382 /*
1383 * Per entry merge function for D/F (and/or rename) conflicts. In the
1384 * cases we can cleanly resolve D/F conflicts, process_entry() can
1385 * clean out all the files below the directory for us. All D/F
1386 * conflict cases must be handled here at the end to make sure any
1387 * directories that can be cleaned out, are.
1388 *
1389 * Some rename conflicts may also be handled here that don't necessarily
1390 * involve D/F conflicts, since the code to handle them is generic enough
1391 * to handle those rename conflicts with or without D/F conflicts also
1392 * being involved.
1393 */
1394 static int process_df_entry(struct merge_options *o,
1395 const char *path, struct stage_data *entry)
1396 {
1397 int clean_merge = 1;
1398 unsigned o_mode = entry->stages[1].mode;
1399 unsigned a_mode = entry->stages[2].mode;
1400 unsigned b_mode = entry->stages[3].mode;
1401 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1402 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1403 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1404 struct stat st;
1405
1406 entry->processed = 1;
1407 if (entry->rename_df_conflict_info) {
1408 struct rename_df_conflict_info *conflict_info = entry->rename_df_conflict_info;
1409 char *src;
1410 switch (conflict_info->rename_type) {
1411 case RENAME_NORMAL:
1412 clean_merge = merge_content(o, path,
1413 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1414 conflict_info->branch1);
1415 break;
1416 case RENAME_DELETE:
1417 clean_merge = 0;
1418 conflict_rename_delete(o, conflict_info->pair1,
1419 conflict_info->branch1,
1420 conflict_info->branch2);
1421 break;
1422 case RENAME_ONE_FILE_TO_TWO:
1423 src = conflict_info->pair1->one->path;
1424 clean_merge = 0;
1425 output(o, 1, "CONFLICT (rename/rename): "
1426 "Rename \"%s\"->\"%s\" in branch \"%s\" "
1427 "rename \"%s\"->\"%s\" in \"%s\"%s",
1428 src, conflict_info->pair1->two->path, conflict_info->branch1,
1429 src, conflict_info->pair2->two->path, conflict_info->branch2,
1430 o->call_depth ? " (left unresolved)" : "");
1431 if (o->call_depth) {
1432 remove_file_from_cache(src);
1433 update_file(o, 0, conflict_info->pair1->one->sha1,
1434 conflict_info->pair1->one->mode, src);
1435 }
1436 conflict_rename_rename_1to2(o, conflict_info->pair1,
1437 conflict_info->branch1,
1438 conflict_info->pair2,
1439 conflict_info->branch2);
1440 conflict_info->dst_entry2->processed = 1;
1441 break;
1442 default:
1443 entry->processed = 0;
1444 break;
1445 }
1446 } else if (o_sha && (!a_sha || !b_sha)) {
1447 /* Modify/delete; deleted side may have put a directory in the way */
1448 const char *new_path = path;
1449 if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode))
1450 new_path = unique_path(o, path, a_sha ? o->branch1 : o->branch2);
1451 clean_merge = 0;
1452 handle_delete_modify(o, path, new_path,
1453 a_sha, a_mode, b_sha, b_mode);
1454 } else if (!o_sha && !!a_sha != !!b_sha) {
1455 /* directory -> (directory, file) */
1456 const char *add_branch;
1457 const char *other_branch;
1458 unsigned mode;
1459 const unsigned char *sha;
1460 const char *conf;
1461
1462 if (a_sha) {
1463 add_branch = o->branch1;
1464 other_branch = o->branch2;
1465 mode = a_mode;
1466 sha = a_sha;
1467 conf = "file/directory";
1468 } else {
1469 add_branch = o->branch2;
1470 other_branch = o->branch1;
1471 mode = b_mode;
1472 sha = b_sha;
1473 conf = "directory/file";
1474 }
1475 if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1476 const char *new_path = unique_path(o, path, add_branch);
1477 clean_merge = 0;
1478 output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. "
1479 "Adding %s as %s",
1480 conf, path, other_branch, path, new_path);
1481 update_file(o, 0, sha, mode, new_path);
1482 } else {
1483 output(o, 2, "Adding %s", path);
1484 update_file(o, 1, sha, mode, path);
1485 }
1486 } else {
1487 entry->processed = 0;
1488 return 1; /* not handled; assume clean until processed */
1489 }
1490
1491 return clean_merge;
1492 }
1493
1494 int merge_trees(struct merge_options *o,
1495 struct tree *head,
1496 struct tree *merge,
1497 struct tree *common,
1498 struct tree **result)
1499 {
1500 int code, clean;
1501
1502 if (o->subtree_shift) {
1503 merge = shift_tree_object(head, merge, o->subtree_shift);
1504 common = shift_tree_object(head, common, o->subtree_shift);
1505 }
1506
1507 if (sha_eq(common->object.sha1, merge->object.sha1)) {
1508 output(o, 0, "Already up-to-date!");
1509 *result = head;
1510 return 1;
1511 }
1512
1513 code = git_merge_trees(o->call_depth, common, head, merge);
1514
1515 if (code != 0) {
1516 if (show(o, 4) || o->call_depth)
1517 die("merging of trees %s and %s failed",
1518 sha1_to_hex(head->object.sha1),
1519 sha1_to_hex(merge->object.sha1));
1520 else
1521 exit(128);
1522 }
1523
1524 if (unmerged_cache()) {
1525 struct string_list *entries, *re_head, *re_merge;
1526 int i;
1527 string_list_clear(&o->current_file_set, 1);
1528 string_list_clear(&o->current_directory_set, 1);
1529 get_files_dirs(o, head);
1530 get_files_dirs(o, merge);
1531
1532 entries = get_unmerged();
1533 make_room_for_directories_of_df_conflicts(o, entries);
1534 re_head = get_renames(o, head, common, head, merge, entries);
1535 re_merge = get_renames(o, merge, common, head, merge, entries);
1536 clean = process_renames(o, re_head, re_merge);
1537 for (i = 0; i < entries->nr; i++) {
1538 const char *path = entries->items[i].string;
1539 struct stage_data *e = entries->items[i].util;
1540 if (!e->processed
1541 && !process_entry(o, path, e))
1542 clean = 0;
1543 }
1544 for (i = 0; i < entries->nr; i++) {
1545 const char *path = entries->items[i].string;
1546 struct stage_data *e = entries->items[i].util;
1547 if (!e->processed
1548 && !process_df_entry(o, path, e))
1549 clean = 0;
1550 }
1551 for (i = 0; i < entries->nr; i++) {
1552 struct stage_data *e = entries->items[i].util;
1553 if (!e->processed)
1554 die("Unprocessed path??? %s",
1555 entries->items[i].string);
1556 }
1557
1558 string_list_clear(re_merge, 0);
1559 string_list_clear(re_head, 0);
1560 string_list_clear(entries, 1);
1561
1562 }
1563 else
1564 clean = 1;
1565
1566 if (o->call_depth)
1567 *result = write_tree_from_memory(o);
1568
1569 return clean;
1570 }
1571
1572 static struct commit_list *reverse_commit_list(struct commit_list *list)
1573 {
1574 struct commit_list *next = NULL, *current, *backup;
1575 for (current = list; current; current = backup) {
1576 backup = current->next;
1577 current->next = next;
1578 next = current;
1579 }
1580 return next;
1581 }
1582
1583 /*
1584 * Merge the commits h1 and h2, return the resulting virtual
1585 * commit object and a flag indicating the cleanness of the merge.
1586 */
1587 int merge_recursive(struct merge_options *o,
1588 struct commit *h1,
1589 struct commit *h2,
1590 struct commit_list *ca,
1591 struct commit **result)
1592 {
1593 struct commit_list *iter;
1594 struct commit *merged_common_ancestors;
1595 struct tree *mrtree = mrtree;
1596 int clean;
1597
1598 if (show(o, 4)) {
1599 output(o, 4, "Merging:");
1600 output_commit_title(o, h1);
1601 output_commit_title(o, h2);
1602 }
1603
1604 if (!ca) {
1605 ca = get_merge_bases(h1, h2, 1);
1606 ca = reverse_commit_list(ca);
1607 }
1608
1609 if (show(o, 5)) {
1610 output(o, 5, "found %u common ancestor(s):", commit_list_count(ca));
1611 for (iter = ca; iter; iter = iter->next)
1612 output_commit_title(o, iter->item);
1613 }
1614
1615 merged_common_ancestors = pop_commit(&ca);
1616 if (merged_common_ancestors == NULL) {
1617 /* if there is no common ancestor, make an empty tree */
1618 struct tree *tree = xcalloc(1, sizeof(struct tree));
1619
1620 tree->object.parsed = 1;
1621 tree->object.type = OBJ_TREE;
1622 pretend_sha1_file(NULL, 0, OBJ_TREE, tree->object.sha1);
1623 merged_common_ancestors = make_virtual_commit(tree, "ancestor");
1624 }
1625
1626 for (iter = ca; iter; iter = iter->next) {
1627 const char *saved_b1, *saved_b2;
1628 o->call_depth++;
1629 /*
1630 * When the merge fails, the result contains files
1631 * with conflict markers. The cleanness flag is
1632 * ignored, it was never actually used, as result of
1633 * merge_trees has always overwritten it: the committed
1634 * "conflicts" were already resolved.
1635 */
1636 discard_cache();
1637 saved_b1 = o->branch1;
1638 saved_b2 = o->branch2;
1639 o->branch1 = "Temporary merge branch 1";
1640 o->branch2 = "Temporary merge branch 2";
1641 merge_recursive(o, merged_common_ancestors, iter->item,
1642 NULL, &merged_common_ancestors);
1643 o->branch1 = saved_b1;
1644 o->branch2 = saved_b2;
1645 o->call_depth--;
1646
1647 if (!merged_common_ancestors)
1648 die("merge returned no commit");
1649 }
1650
1651 discard_cache();
1652 if (!o->call_depth)
1653 read_cache();
1654
1655 o->ancestor = "merged common ancestors";
1656 clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
1657 &mrtree);
1658
1659 if (o->call_depth) {
1660 *result = make_virtual_commit(mrtree, "merged tree");
1661 commit_list_insert(h1, &(*result)->parents);
1662 commit_list_insert(h2, &(*result)->parents->next);
1663 }
1664 flush_output(o);
1665 return clean;
1666 }
1667
1668 static struct commit *get_ref(const unsigned char *sha1, const char *name)
1669 {
1670 struct object *object;
1671
1672 object = deref_tag(parse_object(sha1), name, strlen(name));
1673 if (!object)
1674 return NULL;
1675 if (object->type == OBJ_TREE)
1676 return make_virtual_commit((struct tree*)object, name);
1677 if (object->type != OBJ_COMMIT)
1678 return NULL;
1679 if (parse_commit((struct commit *)object))
1680 return NULL;
1681 return (struct commit *)object;
1682 }
1683
1684 int merge_recursive_generic(struct merge_options *o,
1685 const unsigned char *head,
1686 const unsigned char *merge,
1687 int num_base_list,
1688 const unsigned char **base_list,
1689 struct commit **result)
1690 {
1691 int clean, index_fd;
1692 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
1693 struct commit *head_commit = get_ref(head, o->branch1);
1694 struct commit *next_commit = get_ref(merge, o->branch2);
1695 struct commit_list *ca = NULL;
1696
1697 if (base_list) {
1698 int i;
1699 for (i = 0; i < num_base_list; ++i) {
1700 struct commit *base;
1701 if (!(base = get_ref(base_list[i], sha1_to_hex(base_list[i]))))
1702 return error("Could not parse object '%s'",
1703 sha1_to_hex(base_list[i]));
1704 commit_list_insert(base, &ca);
1705 }
1706 }
1707
1708 index_fd = hold_locked_index(lock, 1);
1709 clean = merge_recursive(o, head_commit, next_commit, ca,
1710 result);
1711 if (active_cache_changed &&
1712 (write_cache(index_fd, active_cache, active_nr) ||
1713 commit_locked_index(lock)))
1714 return error("Unable to write index.");
1715
1716 return clean ? 0 : 1;
1717 }
1718
1719 static int merge_recursive_config(const char *var, const char *value, void *cb)
1720 {
1721 struct merge_options *o = cb;
1722 if (!strcasecmp(var, "merge.verbosity")) {
1723 o->verbosity = git_config_int(var, value);
1724 return 0;
1725 }
1726 if (!strcasecmp(var, "diff.renamelimit")) {
1727 o->diff_rename_limit = git_config_int(var, value);
1728 return 0;
1729 }
1730 if (!strcasecmp(var, "merge.renamelimit")) {
1731 o->merge_rename_limit = git_config_int(var, value);
1732 return 0;
1733 }
1734 return git_xmerge_config(var, value, cb);
1735 }
1736
1737 void init_merge_options(struct merge_options *o)
1738 {
1739 memset(o, 0, sizeof(struct merge_options));
1740 o->verbosity = 2;
1741 o->buffer_output = 1;
1742 o->diff_rename_limit = -1;
1743 o->merge_rename_limit = -1;
1744 o->renormalize = 0;
1745 git_config(merge_recursive_config, o);
1746 if (getenv("GIT_MERGE_VERBOSITY"))
1747 o->verbosity =
1748 strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10);
1749 if (o->verbosity >= 5)
1750 o->buffer_output = 0;
1751 strbuf_init(&o->obuf, 0);
1752 memset(&o->current_file_set, 0, sizeof(struct string_list));
1753 o->current_file_set.strdup_strings = 1;
1754 memset(&o->current_directory_set, 0, sizeof(struct string_list));
1755 o->current_directory_set.strdup_strings = 1;
1756 }
1757
1758 int parse_merge_opt(struct merge_options *o, const char *s)
1759 {
1760 if (!s || !*s)
1761 return -1;
1762 if (!strcmp(s, "ours"))
1763 o->recursive_variant = MERGE_RECURSIVE_OURS;
1764 else if (!strcmp(s, "theirs"))
1765 o->recursive_variant = MERGE_RECURSIVE_THEIRS;
1766 else if (!strcmp(s, "subtree"))
1767 o->subtree_shift = "";
1768 else if (!prefixcmp(s, "subtree="))
1769 o->subtree_shift = s + strlen("subtree=");
1770 else if (!strcmp(s, "patience"))
1771 o->xdl_opts |= XDF_PATIENCE_DIFF;
1772 else if (!strcmp(s, "ignore-space-change"))
1773 o->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
1774 else if (!strcmp(s, "ignore-all-space"))
1775 o->xdl_opts |= XDF_IGNORE_WHITESPACE;
1776 else if (!strcmp(s, "ignore-space-at-eol"))
1777 o->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
1778 else if (!strcmp(s, "renormalize"))
1779 o->renormalize = 1;
1780 else if (!strcmp(s, "no-renormalize"))
1781 o->renormalize = 0;
1782 else if (!prefixcmp(s, "rename-threshold=")) {
1783 const char *score = s + strlen("rename-threshold=");
1784 if ((o->rename_score = parse_rename_score(&score)) == -1 || *score != 0)
1785 return -1;
1786 }
1787 else
1788 return -1;
1789 return 0;
1790 }