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Pass empty file to p4merge where no base is suitable.
[git/debian.git] / merge-recursive.c
blobaf131508ec7ffa3ac7b1b1b1cadfcda0040becf2
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 const char rename_limit_advice[] =
26 "inexact rename detection was skipped because there were too many\n"
27 " files. You may want to set your merge.renamelimit variable to at least\n"
28 " %d and retry this merge.";
29
30 static struct tree *shift_tree_object(struct tree *one, struct tree *two,
31 const char *subtree_shift)
32 {
33 unsigned char shifted[20];
34
35 if (!*subtree_shift) {
36 shift_tree(one->object.sha1, two->object.sha1, shifted, 0);
37 } else {
38 shift_tree_by(one->object.sha1, two->object.sha1, shifted,
39 subtree_shift);
40 }
41 if (!hashcmp(two->object.sha1, shifted))
42 return two;
43 return lookup_tree(shifted);
44 }
45
46 /*
47 * A virtual commit has (const char *)commit->util set to the name.
48 */
49
50 static struct commit *make_virtual_commit(struct tree *tree, const char *comment)
51 {
52 struct commit *commit = xcalloc(1, sizeof(struct commit));
53 commit->tree = tree;
54 commit->util = (void*)comment;
55 /* avoid warnings */
56 commit->object.parsed = 1;
57 return commit;
58 }
59
60 /*
61 * Since we use get_tree_entry(), which does not put the read object into
62 * the object pool, we cannot rely on a == b.
63 */
64 static int sha_eq(const unsigned char *a, const unsigned char *b)
65 {
66 if (!a && !b)
67 return 2;
68 return a && b && hashcmp(a, b) == 0;
69 }
70
71 enum rename_type {
72 RENAME_NORMAL = 0,
73 RENAME_DELETE,
74 RENAME_ONE_FILE_TO_TWO
75 };
76
77 struct rename_df_conflict_info {
78 enum rename_type rename_type;
79 struct diff_filepair *pair1;
80 struct diff_filepair *pair2;
81 const char *branch1;
82 const char *branch2;
83 struct stage_data *dst_entry1;
84 struct stage_data *dst_entry2;
85 };
86
87 /*
88 * Since we want to write the index eventually, we cannot reuse the index
89 * for these (temporary) data.
90 */
91 struct stage_data {
92 struct {
93 unsigned mode;
94 unsigned char sha[20];
95 } stages[4];
96 struct rename_df_conflict_info *rename_df_conflict_info;
97 unsigned processed:1;
98 };
99
100 static inline void setup_rename_df_conflict_info(enum rename_type rename_type,
101 struct diff_filepair *pair1,
102 struct diff_filepair *pair2,
103 const char *branch1,
104 const char *branch2,
105 struct stage_data *dst_entry1,
106 struct stage_data *dst_entry2)
107 {
108 struct rename_df_conflict_info *ci = xcalloc(1, sizeof(struct rename_df_conflict_info));
109 ci->rename_type = rename_type;
110 ci->pair1 = pair1;
111 ci->branch1 = branch1;
112 ci->branch2 = branch2;
113
114 ci->dst_entry1 = dst_entry1;
115 dst_entry1->rename_df_conflict_info = ci;
116 dst_entry1->processed = 0;
117
118 assert(!pair2 == !dst_entry2);
119 if (dst_entry2) {
120 ci->dst_entry2 = dst_entry2;
121 ci->pair2 = pair2;
122 dst_entry2->rename_df_conflict_info = ci;
123 dst_entry2->processed = 0;
124 }
125 }
126
127 static int show(struct merge_options *o, int v)
128 {
129 return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5;
130 }
131
132 static void flush_output(struct merge_options *o)
133 {
134 if (o->obuf.len) {
135 fputs(o->obuf.buf, stdout);
136 strbuf_reset(&o->obuf);
137 }
138 }
139
140 __attribute__((format (printf, 3, 4)))
141 static void output(struct merge_options *o, int v, const char *fmt, ...)
142 {
143 va_list ap;
144
145 if (!show(o, v))
146 return;
147
148 strbuf_grow(&o->obuf, o->call_depth * 2 + 2);
149 memset(o->obuf.buf + o->obuf.len, ' ', o->call_depth * 2);
150 strbuf_setlen(&o->obuf, o->obuf.len + o->call_depth * 2);
151
152 va_start(ap, fmt);
153 strbuf_vaddf(&o->obuf, fmt, ap);
154 va_end(ap);
155
156 strbuf_add(&o->obuf, "\n", 1);
157 if (!o->buffer_output)
158 flush_output(o);
159 }
160
161 static void output_commit_title(struct merge_options *o, struct commit *commit)
162 {
163 int i;
164 flush_output(o);
165 for (i = o->call_depth; i--;)
166 fputs(" ", stdout);
167 if (commit->util)
168 printf("virtual %s\n", (char *)commit->util);
169 else {
170 printf("%s ", find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV));
171 if (parse_commit(commit) != 0)
172 printf("(bad commit)\n");
173 else {
174 const char *title;
175 int len = find_commit_subject(commit->buffer, &title);
176 if (len)
177 printf("%.*s\n", len, title);
178 }
179 }
180 }
181
182 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
183 const char *path, int stage, int refresh, int options)
184 {
185 struct cache_entry *ce;
186 ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage, refresh);
187 if (!ce)
188 return error("addinfo_cache failed for path '%s'", path);
189 return add_cache_entry(ce, options);
190 }
191
192 static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree)
193 {
194 parse_tree(tree);
195 init_tree_desc(desc, tree->buffer, tree->size);
196 }
197
198 static int git_merge_trees(int index_only,
199 struct tree *common,
200 struct tree *head,
201 struct tree *merge)
202 {
203 int rc;
204 struct tree_desc t[3];
205 struct unpack_trees_options opts;
206
207 memset(&opts, 0, sizeof(opts));
208 if (index_only)
209 opts.index_only = 1;
210 else
211 opts.update = 1;
212 opts.merge = 1;
213 opts.head_idx = 2;
214 opts.fn = threeway_merge;
215 opts.src_index = &the_index;
216 opts.dst_index = &the_index;
217 setup_unpack_trees_porcelain(&opts, "merge");
218
219 init_tree_desc_from_tree(t+0, common);
220 init_tree_desc_from_tree(t+1, head);
221 init_tree_desc_from_tree(t+2, merge);
222
223 rc = unpack_trees(3, t, &opts);
224 cache_tree_free(&active_cache_tree);
225 return rc;
226 }
227
228 struct tree *write_tree_from_memory(struct merge_options *o)
229 {
230 struct tree *result = NULL;
231
232 if (unmerged_cache()) {
233 int i;
234 fprintf(stderr, "BUG: There are unmerged index entries:\n");
235 for (i = 0; i < active_nr; i++) {
236 struct cache_entry *ce = active_cache[i];
237 if (ce_stage(ce))
238 fprintf(stderr, "BUG: %d %.*s", ce_stage(ce),
239 (int)ce_namelen(ce), ce->name);
240 }
241 die("Bug in merge-recursive.c");
242 }
243
244 if (!active_cache_tree)
245 active_cache_tree = cache_tree();
246
247 if (!cache_tree_fully_valid(active_cache_tree) &&
248 cache_tree_update(active_cache_tree,
249 active_cache, active_nr, 0, 0) < 0)
250 die("error building trees");
251
252 result = lookup_tree(active_cache_tree->sha1);
253
254 return result;
255 }
256
257 static int save_files_dirs(const unsigned char *sha1,
258 const char *base, int baselen, const char *path,
259 unsigned int mode, int stage, void *context)
260 {
261 int len = strlen(path);
262 char *newpath = xmalloc(baselen + len + 1);
263 struct merge_options *o = context;
264
265 memcpy(newpath, base, baselen);
266 memcpy(newpath + baselen, path, len);
267 newpath[baselen + len] = '\0';
268
269 if (S_ISDIR(mode))
270 string_list_insert(&o->current_directory_set, newpath);
271 else
272 string_list_insert(&o->current_file_set, newpath);
273 free(newpath);
274
275 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
276 }
277
278 static int get_files_dirs(struct merge_options *o, struct tree *tree)
279 {
280 int n;
281 if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs, o))
282 return 0;
283 n = o->current_file_set.nr + o->current_directory_set.nr;
284 return n;
285 }
286
287 /*
288 * Returns an index_entry instance which doesn't have to correspond to
289 * a real cache entry in Git's index.
290 */
291 static struct stage_data *insert_stage_data(const char *path,
292 struct tree *o, struct tree *a, struct tree *b,
293 struct string_list *entries)
294 {
295 struct string_list_item *item;
296 struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
297 get_tree_entry(o->object.sha1, path,
298 e->stages[1].sha, &e->stages[1].mode);
299 get_tree_entry(a->object.sha1, path,
300 e->stages[2].sha, &e->stages[2].mode);
301 get_tree_entry(b->object.sha1, path,
302 e->stages[3].sha, &e->stages[3].mode);
303 item = string_list_insert(entries, path);
304 item->util = e;
305 return e;
306 }
307
308 /*
309 * Create a dictionary mapping file names to stage_data objects. The
310 * dictionary contains one entry for every path with a non-zero stage entry.
311 */
312 static struct string_list *get_unmerged(void)
313 {
314 struct string_list *unmerged = xcalloc(1, sizeof(struct string_list));
315 int i;
316
317 unmerged->strdup_strings = 1;
318
319 for (i = 0; i < active_nr; i++) {
320 struct string_list_item *item;
321 struct stage_data *e;
322 struct cache_entry *ce = active_cache[i];
323 if (!ce_stage(ce))
324 continue;
325
326 item = string_list_lookup(unmerged, ce->name);
327 if (!item) {
328 item = string_list_insert(unmerged, ce->name);
329 item->util = xcalloc(1, sizeof(struct stage_data));
330 }
331 e = item->util;
332 e->stages[ce_stage(ce)].mode = ce->ce_mode;
333 hashcpy(e->stages[ce_stage(ce)].sha, ce->sha1);
334 }
335
336 return unmerged;
337 }
338
339 static void make_room_for_directories_of_df_conflicts(struct merge_options *o,
340 struct string_list *entries)
341 {
342 /* If there are D/F conflicts, and the paths currently exist
343 * in the working copy as a file, we want to remove them to
344 * make room for the corresponding directory. Such paths will
345 * later be processed in process_df_entry() at the end. If
346 * the corresponding directory ends up being removed by the
347 * merge, then the file will be reinstated at that time;
348 * otherwise, if the file is not supposed to be removed by the
349 * merge, the contents of the file will be placed in another
350 * unique filename.
351 *
352 * NOTE: This function relies on the fact that entries for a
353 * D/F conflict will appear adjacent in the index, with the
354 * entries for the file appearing before entries for paths
355 * below the corresponding directory.
356 */
357 const char *last_file = NULL;
358 int last_len = 0;
359 int i;
360
361 for (i = 0; i < entries->nr; i++) {
362 const char *path = entries->items[i].string;
363 int len = strlen(path);
364 struct stage_data *e = entries->items[i].util;
365
366 /*
367 * Check if last_file & path correspond to a D/F conflict;
368 * i.e. whether path is last_file+'/'+<something>.
369 * If so, remove last_file to make room for path and friends.
370 */
371 if (last_file &&
372 len > last_len &&
373 memcmp(path, last_file, last_len) == 0 &&
374 path[last_len] == '/') {
375 output(o, 3, "Removing %s to make room for subdirectory; may re-add later.", last_file);
376 unlink(last_file);
377 }
378
379 /*
380 * Determine whether path could exist as a file in the
381 * working directory as a possible D/F conflict. This
382 * will only occur when it exists in stage 2 as a
383 * file.
384 */
385 if (S_ISREG(e->stages[2].mode) || S_ISLNK(e->stages[2].mode)) {
386 last_file = path;
387 last_len = len;
388 } else {
389 last_file = NULL;
390 }
391 }
392 }
393
394 struct rename {
395 struct diff_filepair *pair;
396 struct stage_data *src_entry;
397 struct stage_data *dst_entry;
398 unsigned processed:1;
399 };
400
401 /*
402 * Get information of all renames which occurred between 'o_tree' and
403 * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
404 * 'b_tree') to be able to associate the correct cache entries with
405 * the rename information. 'tree' is always equal to either a_tree or b_tree.
406 */
407 static struct string_list *get_renames(struct merge_options *o,
408 struct tree *tree,
409 struct tree *o_tree,
410 struct tree *a_tree,
411 struct tree *b_tree,
412 struct string_list *entries)
413 {
414 int i;
415 struct string_list *renames;
416 struct diff_options opts;
417
418 renames = xcalloc(1, sizeof(struct string_list));
419 diff_setup(&opts);
420 DIFF_OPT_SET(&opts, RECURSIVE);
421 opts.detect_rename = DIFF_DETECT_RENAME;
422 opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
423 o->diff_rename_limit >= 0 ? o->diff_rename_limit :
424 1000;
425 opts.rename_score = o->rename_score;
426 opts.show_rename_progress = o->show_rename_progress;
427 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
428 if (diff_setup_done(&opts) < 0)
429 die("diff setup failed");
430 diff_tree_sha1(o_tree->object.sha1, tree->object.sha1, "", &opts);
431 diffcore_std(&opts);
432 if (opts.needed_rename_limit > o->needed_rename_limit)
433 o->needed_rename_limit = opts.needed_rename_limit;
434 for (i = 0; i < diff_queued_diff.nr; ++i) {
435 struct string_list_item *item;
436 struct rename *re;
437 struct diff_filepair *pair = diff_queued_diff.queue[i];
438 if (pair->status != 'R') {
439 diff_free_filepair(pair);
440 continue;
441 }
442 re = xmalloc(sizeof(*re));
443 re->processed = 0;
444 re->pair = pair;
445 item = string_list_lookup(entries, re->pair->one->path);
446 if (!item)
447 re->src_entry = insert_stage_data(re->pair->one->path,
448 o_tree, a_tree, b_tree, entries);
449 else
450 re->src_entry = item->util;
451
452 item = string_list_lookup(entries, re->pair->two->path);
453 if (!item)
454 re->dst_entry = insert_stage_data(re->pair->two->path,
455 o_tree, a_tree, b_tree, entries);
456 else
457 re->dst_entry = item->util;
458 item = string_list_insert(renames, pair->one->path);
459 item->util = re;
460 }
461 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
462 diff_queued_diff.nr = 0;
463 diff_flush(&opts);
464 return renames;
465 }
466
467 static int update_stages_options(const char *path, struct diff_filespec *o,
468 struct diff_filespec *a, struct diff_filespec *b,
469 int clear, int options)
470 {
471 if (clear)
472 if (remove_file_from_cache(path))
473 return -1;
474 if (o)
475 if (add_cacheinfo(o->mode, o->sha1, path, 1, 0, options))
476 return -1;
477 if (a)
478 if (add_cacheinfo(a->mode, a->sha1, path, 2, 0, options))
479 return -1;
480 if (b)
481 if (add_cacheinfo(b->mode, b->sha1, path, 3, 0, options))
482 return -1;
483 return 0;
484 }
485
486 static int update_stages(const char *path, struct diff_filespec *o,
487 struct diff_filespec *a, struct diff_filespec *b,
488 int clear)
489 {
490 int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE;
491 return update_stages_options(path, o, a, b, clear, options);
492 }
493
494 static int update_stages_and_entry(const char *path,
495 struct stage_data *entry,
496 struct diff_filespec *o,
497 struct diff_filespec *a,
498 struct diff_filespec *b,
499 int clear)
500 {
501 int options;
502
503 entry->processed = 0;
504 entry->stages[1].mode = o->mode;
505 entry->stages[2].mode = a->mode;
506 entry->stages[3].mode = b->mode;
507 hashcpy(entry->stages[1].sha, o->sha1);
508 hashcpy(entry->stages[2].sha, a->sha1);
509 hashcpy(entry->stages[3].sha, b->sha1);
510 options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_SKIP_DFCHECK;
511 return update_stages_options(path, o, a, b, clear, options);
512 }
513
514 static int remove_file(struct merge_options *o, int clean,
515 const char *path, int no_wd)
516 {
517 int update_cache = o->call_depth || clean;
518 int update_working_directory = !o->call_depth && !no_wd;
519
520 if (update_cache) {
521 if (remove_file_from_cache(path))
522 return -1;
523 }
524 if (update_working_directory) {
525 if (remove_path(path))
526 return -1;
527 }
528 return 0;
529 }
530
531 static char *unique_path(struct merge_options *o, const char *path, const char *branch)
532 {
533 char *newpath = xmalloc(strlen(path) + 1 + strlen(branch) + 8 + 1);
534 int suffix = 0;
535 struct stat st;
536 char *p = newpath + strlen(path);
537 strcpy(newpath, path);
538 *(p++) = '~';
539 strcpy(p, branch);
540 for (; *p; ++p)
541 if ('/' == *p)
542 *p = '_';
543 while (string_list_has_string(&o->current_file_set, newpath) ||
544 string_list_has_string(&o->current_directory_set, newpath) ||
545 lstat(newpath, &st) == 0)
546 sprintf(p, "_%d", suffix++);
547
548 string_list_insert(&o->current_file_set, newpath);
549 return newpath;
550 }
551
552 static void flush_buffer(int fd, const char *buf, unsigned long size)
553 {
554 while (size > 0) {
555 long ret = write_in_full(fd, buf, size);
556 if (ret < 0) {
557 /* Ignore epipe */
558 if (errno == EPIPE)
559 break;
560 die_errno("merge-recursive");
561 } else if (!ret) {
562 die("merge-recursive: disk full?");
563 }
564 size -= ret;
565 buf += ret;
566 }
567 }
568
569 static int would_lose_untracked(const char *path)
570 {
571 int pos = cache_name_pos(path, strlen(path));
572
573 if (pos < 0)
574 pos = -1 - pos;
575 while (pos < active_nr &&
576 !strcmp(path, active_cache[pos]->name)) {
577 /*
578 * If stage #0, it is definitely tracked.
579 * If it has stage #2 then it was tracked
580 * before this merge started. All other
581 * cases the path was not tracked.
582 */
583 switch (ce_stage(active_cache[pos])) {
584 case 0:
585 case 2:
586 return 0;
587 }
588 pos++;
589 }
590 return file_exists(path);
591 }
592
593 static int make_room_for_path(const char *path)
594 {
595 int status;
596 const char *msg = "failed to create path '%s'%s";
597
598 status = safe_create_leading_directories_const(path);
599 if (status) {
600 if (status == -3) {
601 /* something else exists */
602 error(msg, path, ": perhaps a D/F conflict?");
603 return -1;
604 }
605 die(msg, path, "");
606 }
607
608 /*
609 * Do not unlink a file in the work tree if we are not
610 * tracking it.
611 */
612 if (would_lose_untracked(path))
613 return error("refusing to lose untracked file at '%s'",
614 path);
615
616 /* Successful unlink is good.. */
617 if (!unlink(path))
618 return 0;
619 /* .. and so is no existing file */
620 if (errno == ENOENT)
621 return 0;
622 /* .. but not some other error (who really cares what?) */
623 return error(msg, path, ": perhaps a D/F conflict?");
624 }
625
626 static void update_file_flags(struct merge_options *o,
627 const unsigned char *sha,
628 unsigned mode,
629 const char *path,
630 int update_cache,
631 int update_wd)
632 {
633 if (o->call_depth)
634 update_wd = 0;
635
636 if (update_wd) {
637 enum object_type type;
638 void *buf;
639 unsigned long size;
640
641 if (S_ISGITLINK(mode)) {
642 /*
643 * We may later decide to recursively descend into
644 * the submodule directory and update its index
645 * and/or work tree, but we do not do that now.
646 */
647 update_wd = 0;
648 goto update_index;
649 }
650
651 buf = read_sha1_file(sha, &type, &size);
652 if (!buf)
653 die("cannot read object %s '%s'", sha1_to_hex(sha), path);
654 if (type != OBJ_BLOB)
655 die("blob expected for %s '%s'", sha1_to_hex(sha), path);
656 if (S_ISREG(mode)) {
657 struct strbuf strbuf = STRBUF_INIT;
658 if (convert_to_working_tree(path, buf, size, &strbuf)) {
659 free(buf);
660 size = strbuf.len;
661 buf = strbuf_detach(&strbuf, NULL);
662 }
663 }
664
665 if (make_room_for_path(path) < 0) {
666 update_wd = 0;
667 free(buf);
668 goto update_index;
669 }
670 if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
671 int fd;
672 if (mode & 0100)
673 mode = 0777;
674 else
675 mode = 0666;
676 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
677 if (fd < 0)
678 die_errno("failed to open '%s'", path);
679 flush_buffer(fd, buf, size);
680 close(fd);
681 } else if (S_ISLNK(mode)) {
682 char *lnk = xmemdupz(buf, size);
683 safe_create_leading_directories_const(path);
684 unlink(path);
685 if (symlink(lnk, path))
686 die_errno("failed to symlink '%s'", path);
687 free(lnk);
688 } else
689 die("do not know what to do with %06o %s '%s'",
690 mode, sha1_to_hex(sha), path);
691 free(buf);
692 }
693 update_index:
694 if (update_cache)
695 add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
696 }
697
698 static void update_file(struct merge_options *o,
699 int clean,
700 const unsigned char *sha,
701 unsigned mode,
702 const char *path)
703 {
704 update_file_flags(o, sha, mode, path, o->call_depth || clean, !o->call_depth);
705 }
706
707 /* Low level file merging, update and removal */
708
709 struct merge_file_info {
710 unsigned char sha[20];
711 unsigned mode;
712 unsigned clean:1,
713 merge:1;
714 };
715
716 static int merge_3way(struct merge_options *o,
717 mmbuffer_t *result_buf,
718 struct diff_filespec *one,
719 struct diff_filespec *a,
720 struct diff_filespec *b,
721 const char *branch1,
722 const char *branch2)
723 {
724 mmfile_t orig, src1, src2;
725 struct ll_merge_options ll_opts = {0};
726 char *base_name, *name1, *name2;
727 int merge_status;
728
729 ll_opts.renormalize = o->renormalize;
730 ll_opts.xdl_opts = o->xdl_opts;
731
732 if (o->call_depth) {
733 ll_opts.virtual_ancestor = 1;
734 ll_opts.variant = 0;
735 } else {
736 switch (o->recursive_variant) {
737 case MERGE_RECURSIVE_OURS:
738 ll_opts.variant = XDL_MERGE_FAVOR_OURS;
739 break;
740 case MERGE_RECURSIVE_THEIRS:
741 ll_opts.variant = XDL_MERGE_FAVOR_THEIRS;
742 break;
743 default:
744 ll_opts.variant = 0;
745 break;
746 }
747 }
748
749 if (strcmp(a->path, b->path) ||
750 (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) {
751 base_name = o->ancestor == NULL ? NULL :
752 xstrdup(mkpath("%s:%s", o->ancestor, one->path));
753 name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
754 name2 = xstrdup(mkpath("%s:%s", branch2, b->path));
755 } else {
756 base_name = o->ancestor == NULL ? NULL :
757 xstrdup(mkpath("%s", o->ancestor));
758 name1 = xstrdup(mkpath("%s", branch1));
759 name2 = xstrdup(mkpath("%s", branch2));
760 }
761
762 read_mmblob(&orig, one->sha1);
763 read_mmblob(&src1, a->sha1);
764 read_mmblob(&src2, b->sha1);
765
766 merge_status = ll_merge(result_buf, a->path, &orig, base_name,
767 &src1, name1, &src2, name2, &ll_opts);
768
769 free(name1);
770 free(name2);
771 free(orig.ptr);
772 free(src1.ptr);
773 free(src2.ptr);
774 return merge_status;
775 }
776
777 static struct merge_file_info merge_file(struct merge_options *o,
778 struct diff_filespec *one,
779 struct diff_filespec *a,
780 struct diff_filespec *b,
781 const char *branch1,
782 const char *branch2)
783 {
784 struct merge_file_info result;
785 result.merge = 0;
786 result.clean = 1;
787
788 if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) {
789 result.clean = 0;
790 if (S_ISREG(a->mode)) {
791 result.mode = a->mode;
792 hashcpy(result.sha, a->sha1);
793 } else {
794 result.mode = b->mode;
795 hashcpy(result.sha, b->sha1);
796 }
797 } else {
798 if (!sha_eq(a->sha1, one->sha1) && !sha_eq(b->sha1, one->sha1))
799 result.merge = 1;
800
801 /*
802 * Merge modes
803 */
804 if (a->mode == b->mode || a->mode == one->mode)
805 result.mode = b->mode;
806 else {
807 result.mode = a->mode;
808 if (b->mode != one->mode) {
809 result.clean = 0;
810 result.merge = 1;
811 }
812 }
813
814 if (sha_eq(a->sha1, b->sha1) || sha_eq(a->sha1, one->sha1))
815 hashcpy(result.sha, b->sha1);
816 else if (sha_eq(b->sha1, one->sha1))
817 hashcpy(result.sha, a->sha1);
818 else if (S_ISREG(a->mode)) {
819 mmbuffer_t result_buf;
820 int merge_status;
821
822 merge_status = merge_3way(o, &result_buf, one, a, b,
823 branch1, branch2);
824
825 if ((merge_status < 0) || !result_buf.ptr)
826 die("Failed to execute internal merge");
827
828 if (write_sha1_file(result_buf.ptr, result_buf.size,
829 blob_type, result.sha))
830 die("Unable to add %s to database",
831 a->path);
832
833 free(result_buf.ptr);
834 result.clean = (merge_status == 0);
835 } else if (S_ISGITLINK(a->mode)) {
836 result.clean = merge_submodule(result.sha, one->path, one->sha1,
837 a->sha1, b->sha1);
838 } else if (S_ISLNK(a->mode)) {
839 hashcpy(result.sha, a->sha1);
840
841 if (!sha_eq(a->sha1, b->sha1))
842 result.clean = 0;
843 } else {
844 die("unsupported object type in the tree");
845 }
846 }
847
848 return result;
849 }
850
851 static void conflict_rename_delete(struct merge_options *o,
852 struct diff_filepair *pair,
853 const char *rename_branch,
854 const char *other_branch)
855 {
856 char *dest_name = pair->two->path;
857 int df_conflict = 0;
858 struct stat st;
859
860 output(o, 1, "CONFLICT (rename/delete): Rename %s->%s in %s "
861 "and deleted in %s",
862 pair->one->path, pair->two->path, rename_branch,
863 other_branch);
864 if (!o->call_depth)
865 update_stages(dest_name, NULL,
866 rename_branch == o->branch1 ? pair->two : NULL,
867 rename_branch == o->branch1 ? NULL : pair->two,
868 1);
869 if (lstat(dest_name, &st) == 0 && S_ISDIR(st.st_mode)) {
870 dest_name = unique_path(o, dest_name, rename_branch);
871 df_conflict = 1;
872 }
873 update_file(o, 0, pair->two->sha1, pair->two->mode, dest_name);
874 if (df_conflict)
875 free(dest_name);
876 }
877
878 static void conflict_rename_rename_1to2(struct merge_options *o,
879 struct diff_filepair *pair1,
880 const char *branch1,
881 struct diff_filepair *pair2,
882 const char *branch2)
883 {
884 /* One file was renamed in both branches, but to different names. */
885 char *del[2];
886 int delp = 0;
887 const char *ren1_dst = pair1->two->path;
888 const char *ren2_dst = pair2->two->path;
889 const char *dst_name1 = ren1_dst;
890 const char *dst_name2 = ren2_dst;
891 struct stat st;
892 if (lstat(ren1_dst, &st) == 0 && S_ISDIR(st.st_mode)) {
893 dst_name1 = del[delp++] = unique_path(o, ren1_dst, branch1);
894 output(o, 1, "%s is a directory in %s adding as %s instead",
895 ren1_dst, branch2, dst_name1);
896 }
897 if (lstat(ren2_dst, &st) == 0 && S_ISDIR(st.st_mode)) {
898 dst_name2 = del[delp++] = unique_path(o, ren2_dst, branch2);
899 output(o, 1, "%s is a directory in %s adding as %s instead",
900 ren2_dst, branch1, dst_name2);
901 }
902 if (o->call_depth) {
903 remove_file_from_cache(dst_name1);
904 remove_file_from_cache(dst_name2);
905 /*
906 * Uncomment to leave the conflicting names in the resulting tree
907 *
908 * update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1);
909 * update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2);
910 */
911 } else {
912 update_stages(ren1_dst, NULL, pair1->two, NULL, 1);
913 update_stages(ren2_dst, NULL, NULL, pair2->two, 1);
914
915 update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1);
916 update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2);
917 }
918 while (delp--)
919 free(del[delp]);
920 }
921
922 static void conflict_rename_rename_2to1(struct merge_options *o,
923 struct rename *ren1,
924 const char *branch1,
925 struct rename *ren2,
926 const char *branch2)
927 {
928 /* Two files were renamed to the same thing. */
929 char *new_path1 = unique_path(o, ren1->pair->two->path, branch1);
930 char *new_path2 = unique_path(o, ren2->pair->two->path, branch2);
931 output(o, 1, "Renaming %s to %s and %s to %s instead",
932 ren1->pair->one->path, new_path1,
933 ren2->pair->one->path, new_path2);
934 remove_file(o, 0, ren1->pair->two->path, 0);
935 update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path1);
936 update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, new_path2);
937 free(new_path2);
938 free(new_path1);
939 }
940
941 static int process_renames(struct merge_options *o,
942 struct string_list *a_renames,
943 struct string_list *b_renames)
944 {
945 int clean_merge = 1, i, j;
946 struct string_list a_by_dst = STRING_LIST_INIT_NODUP;
947 struct string_list b_by_dst = STRING_LIST_INIT_NODUP;
948 const struct rename *sre;
949
950 for (i = 0; i < a_renames->nr; i++) {
951 sre = a_renames->items[i].util;
952 string_list_insert(&a_by_dst, sre->pair->two->path)->util
953 = sre->dst_entry;
954 }
955 for (i = 0; i < b_renames->nr; i++) {
956 sre = b_renames->items[i].util;
957 string_list_insert(&b_by_dst, sre->pair->two->path)->util
958 = sre->dst_entry;
959 }
960
961 for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
962 struct string_list *renames1, *renames2Dst;
963 struct rename *ren1 = NULL, *ren2 = NULL;
964 const char *branch1, *branch2;
965 const char *ren1_src, *ren1_dst;
966
967 if (i >= a_renames->nr) {
968 ren2 = b_renames->items[j++].util;
969 } else if (j >= b_renames->nr) {
970 ren1 = a_renames->items[i++].util;
971 } else {
972 int compare = strcmp(a_renames->items[i].string,
973 b_renames->items[j].string);
974 if (compare <= 0)
975 ren1 = a_renames->items[i++].util;
976 if (compare >= 0)
977 ren2 = b_renames->items[j++].util;
978 }
979
980 /* TODO: refactor, so that 1/2 are not needed */
981 if (ren1) {
982 renames1 = a_renames;
983 renames2Dst = &b_by_dst;
984 branch1 = o->branch1;
985 branch2 = o->branch2;
986 } else {
987 struct rename *tmp;
988 renames1 = b_renames;
989 renames2Dst = &a_by_dst;
990 branch1 = o->branch2;
991 branch2 = o->branch1;
992 tmp = ren2;
993 ren2 = ren1;
994 ren1 = tmp;
995 }
996
997 ren1->dst_entry->processed = 1;
998 ren1->src_entry->processed = 1;
999
1000 if (ren1->processed)
1001 continue;
1002 ren1->processed = 1;
1003
1004 ren1_src = ren1->pair->one->path;
1005 ren1_dst = ren1->pair->two->path;
1006
1007 if (ren2) {
1008 const char *ren2_src = ren2->pair->one->path;
1009 const char *ren2_dst = ren2->pair->two->path;
1010 /* Renamed in 1 and renamed in 2 */
1011 if (strcmp(ren1_src, ren2_src) != 0)
1012 die("ren1.src != ren2.src");
1013 ren2->dst_entry->processed = 1;
1014 ren2->processed = 1;
1015 if (strcmp(ren1_dst, ren2_dst) != 0) {
1016 setup_rename_df_conflict_info(RENAME_ONE_FILE_TO_TWO,
1017 ren1->pair,
1018 ren2->pair,
1019 branch1,
1020 branch2,
1021 ren1->dst_entry,
1022 ren2->dst_entry);
1023 } else {
1024 remove_file(o, 1, ren1_src, 1);
1025 update_stages_and_entry(ren1_dst,
1026 ren1->dst_entry,
1027 ren1->pair->one,
1028 ren1->pair->two,
1029 ren2->pair->two,
1030 1 /* clear */);
1031 }
1032 } else {
1033 /* Renamed in 1, maybe changed in 2 */
1034 struct string_list_item *item;
1035 /* we only use sha1 and mode of these */
1036 struct diff_filespec src_other, dst_other;
1037 int try_merge;
1038
1039 /*
1040 * unpack_trees loads entries from common-commit
1041 * into stage 1, from head-commit into stage 2, and
1042 * from merge-commit into stage 3. We keep track
1043 * of which side corresponds to the rename.
1044 */
1045 int renamed_stage = a_renames == renames1 ? 2 : 3;
1046 int other_stage = a_renames == renames1 ? 3 : 2;
1047
1048 remove_file(o, 1, ren1_src, o->call_depth || renamed_stage == 2);
1049
1050 hashcpy(src_other.sha1, ren1->src_entry->stages[other_stage].sha);
1051 src_other.mode = ren1->src_entry->stages[other_stage].mode;
1052 hashcpy(dst_other.sha1, ren1->dst_entry->stages[other_stage].sha);
1053 dst_other.mode = ren1->dst_entry->stages[other_stage].mode;
1054 try_merge = 0;
1055
1056 if (sha_eq(src_other.sha1, null_sha1)) {
1057 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
1058 ren1->dst_entry->processed = 0;
1059 setup_rename_df_conflict_info(RENAME_DELETE,
1060 ren1->pair,
1061 NULL,
1062 branch1,
1063 branch2,
1064 ren1->dst_entry,
1065 NULL);
1066 } else {
1067 clean_merge = 0;
1068 conflict_rename_delete(o, ren1->pair, branch1, branch2);
1069 }
1070 } else if ((dst_other.mode == ren1->pair->two->mode) &&
1071 sha_eq(dst_other.sha1, ren1->pair->two->sha1)) {
1072 /* Added file on the other side
1073 identical to the file being
1074 renamed: clean merge */
1075 update_file(o, 1, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst);
1076 } else if (!sha_eq(dst_other.sha1, null_sha1)) {
1077 const char *new_path;
1078 clean_merge = 0;
1079 try_merge = 1;
1080 output(o, 1, "CONFLICT (rename/add): Rename %s->%s in %s. "
1081 "%s added in %s",
1082 ren1_src, ren1_dst, branch1,
1083 ren1_dst, branch2);
1084 if (o->call_depth) {
1085 struct merge_file_info mfi;
1086 struct diff_filespec one, a, b;
1087
1088 one.path = a.path = b.path =
1089 (char *)ren1_dst;
1090 hashcpy(one.sha1, null_sha1);
1091 one.mode = 0;
1092 hashcpy(a.sha1, ren1->pair->two->sha1);
1093 a.mode = ren1->pair->two->mode;
1094 hashcpy(b.sha1, dst_other.sha1);
1095 b.mode = dst_other.mode;
1096 mfi = merge_file(o, &one, &a, &b,
1097 branch1,
1098 branch2);
1099 output(o, 1, "Adding merged %s", ren1_dst);
1100 update_file(o, 0,
1101 mfi.sha,
1102 mfi.mode,
1103 ren1_dst);
1104 try_merge = 0;
1105 } else {
1106 new_path = unique_path(o, ren1_dst, branch2);
1107 output(o, 1, "Adding as %s instead", new_path);
1108 update_file(o, 0, dst_other.sha1, dst_other.mode, new_path);
1109 }
1110 } else if ((item = string_list_lookup(renames2Dst, ren1_dst))) {
1111 ren2 = item->util;
1112 clean_merge = 0;
1113 ren2->processed = 1;
1114 output(o, 1, "CONFLICT (rename/rename): "
1115 "Rename %s->%s in %s. "
1116 "Rename %s->%s in %s",
1117 ren1_src, ren1_dst, branch1,
1118 ren2->pair->one->path, ren2->pair->two->path, branch2);
1119 conflict_rename_rename_2to1(o, ren1, branch1, ren2, branch2);
1120 } else
1121 try_merge = 1;
1122
1123 if (try_merge) {
1124 struct diff_filespec *one, *a, *b;
1125 src_other.path = (char *)ren1_src;
1126
1127 one = ren1->pair->one;
1128 if (a_renames == renames1) {
1129 a = ren1->pair->two;
1130 b = &src_other;
1131 } else {
1132 b = ren1->pair->two;
1133 a = &src_other;
1134 }
1135 update_stages_and_entry(ren1_dst, ren1->dst_entry, one, a, b, 1);
1136 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
1137 setup_rename_df_conflict_info(RENAME_NORMAL,
1138 ren1->pair,
1139 NULL,
1140 branch1,
1141 NULL,
1142 ren1->dst_entry,
1143 NULL);
1144 }
1145 }
1146 }
1147 }
1148 string_list_clear(&a_by_dst, 0);
1149 string_list_clear(&b_by_dst, 0);
1150
1151 return clean_merge;
1152 }
1153
1154 static unsigned char *stage_sha(const unsigned char *sha, unsigned mode)
1155 {
1156 return (is_null_sha1(sha) || mode == 0) ? NULL: (unsigned char *)sha;
1157 }
1158
1159 static int read_sha1_strbuf(const unsigned char *sha1, struct strbuf *dst)
1160 {
1161 void *buf;
1162 enum object_type type;
1163 unsigned long size;
1164 buf = read_sha1_file(sha1, &type, &size);
1165 if (!buf)
1166 return error("cannot read object %s", sha1_to_hex(sha1));
1167 if (type != OBJ_BLOB) {
1168 free(buf);
1169 return error("object %s is not a blob", sha1_to_hex(sha1));
1170 }
1171 strbuf_attach(dst, buf, size, size + 1);
1172 return 0;
1173 }
1174
1175 static int blob_unchanged(const unsigned char *o_sha,
1176 const unsigned char *a_sha,
1177 int renormalize, const char *path)
1178 {
1179 struct strbuf o = STRBUF_INIT;
1180 struct strbuf a = STRBUF_INIT;
1181 int ret = 0; /* assume changed for safety */
1182
1183 if (sha_eq(o_sha, a_sha))
1184 return 1;
1185 if (!renormalize)
1186 return 0;
1187
1188 assert(o_sha && a_sha);
1189 if (read_sha1_strbuf(o_sha, &o) || read_sha1_strbuf(a_sha, &a))
1190 goto error_return;
1191 /*
1192 * Note: binary | is used so that both renormalizations are
1193 * performed. Comparison can be skipped if both files are
1194 * unchanged since their sha1s have already been compared.
1195 */
1196 if (renormalize_buffer(path, o.buf, o.len, &o) |
1197 renormalize_buffer(path, a.buf, o.len, &a))
1198 ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len));
1199
1200 error_return:
1201 strbuf_release(&o);
1202 strbuf_release(&a);
1203 return ret;
1204 }
1205
1206 static void handle_delete_modify(struct merge_options *o,
1207 const char *path,
1208 const char *new_path,
1209 unsigned char *a_sha, int a_mode,
1210 unsigned char *b_sha, int b_mode)
1211 {
1212 if (!a_sha) {
1213 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1214 "and modified in %s. Version %s of %s left in tree%s%s.",
1215 path, o->branch1,
1216 o->branch2, o->branch2, path,
1217 path == new_path ? "" : " at ",
1218 path == new_path ? "" : new_path);
1219 update_file(o, 0, b_sha, b_mode, new_path);
1220 } else {
1221 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1222 "and modified in %s. Version %s of %s left in tree%s%s.",
1223 path, o->branch2,
1224 o->branch1, o->branch1, path,
1225 path == new_path ? "" : " at ",
1226 path == new_path ? "" : new_path);
1227 update_file(o, 0, a_sha, a_mode, new_path);
1228 }
1229 }
1230
1231 static int merge_content(struct merge_options *o,
1232 const char *path,
1233 unsigned char *o_sha, int o_mode,
1234 unsigned char *a_sha, int a_mode,
1235 unsigned char *b_sha, int b_mode,
1236 const char *df_rename_conflict_branch)
1237 {
1238 const char *reason = "content";
1239 struct merge_file_info mfi;
1240 struct diff_filespec one, a, b;
1241 struct stat st;
1242 unsigned df_conflict_remains = 0;
1243
1244 if (!o_sha) {
1245 reason = "add/add";
1246 o_sha = (unsigned char *)null_sha1;
1247 }
1248 one.path = a.path = b.path = (char *)path;
1249 hashcpy(one.sha1, o_sha);
1250 one.mode = o_mode;
1251 hashcpy(a.sha1, a_sha);
1252 a.mode = a_mode;
1253 hashcpy(b.sha1, b_sha);
1254 b.mode = b_mode;
1255
1256 mfi = merge_file(o, &one, &a, &b, o->branch1, o->branch2);
1257 if (df_rename_conflict_branch &&
1258 lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1259 df_conflict_remains = 1;
1260 }
1261
1262 if (mfi.clean && !df_conflict_remains &&
1263 sha_eq(mfi.sha, a_sha) && mfi.mode == a.mode)
1264 output(o, 3, "Skipped %s (merged same as existing)", path);
1265 else
1266 output(o, 2, "Auto-merging %s", path);
1267
1268 if (!mfi.clean) {
1269 if (S_ISGITLINK(mfi.mode))
1270 reason = "submodule";
1271 output(o, 1, "CONFLICT (%s): Merge conflict in %s",
1272 reason, path);
1273 }
1274
1275 if (df_conflict_remains) {
1276 const char *new_path;
1277 update_file_flags(o, mfi.sha, mfi.mode, path,
1278 o->call_depth || mfi.clean, 0);
1279 new_path = unique_path(o, path, df_rename_conflict_branch);
1280 mfi.clean = 0;
1281 output(o, 1, "Adding as %s instead", new_path);
1282 update_file_flags(o, mfi.sha, mfi.mode, new_path, 0, 1);
1283 } else {
1284 update_file(o, mfi.clean, mfi.sha, mfi.mode, path);
1285 }
1286 return mfi.clean;
1287
1288 }
1289
1290 /* Per entry merge function */
1291 static int process_entry(struct merge_options *o,
1292 const char *path, struct stage_data *entry)
1293 {
1294 /*
1295 printf("processing entry, clean cache: %s\n", index_only ? "yes": "no");
1296 print_index_entry("\tpath: ", entry);
1297 */
1298 int clean_merge = 1;
1299 int normalize = o->renormalize;
1300 unsigned o_mode = entry->stages[1].mode;
1301 unsigned a_mode = entry->stages[2].mode;
1302 unsigned b_mode = entry->stages[3].mode;
1303 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1304 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1305 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1306
1307 if (entry->rename_df_conflict_info)
1308 return 1; /* Such cases are handled elsewhere. */
1309
1310 entry->processed = 1;
1311 if (o_sha && (!a_sha || !b_sha)) {
1312 /* Case A: Deleted in one */
1313 if ((!a_sha && !b_sha) ||
1314 (!b_sha && blob_unchanged(o_sha, a_sha, normalize, path)) ||
1315 (!a_sha && blob_unchanged(o_sha, b_sha, normalize, path))) {
1316 /* Deleted in both or deleted in one and
1317 * unchanged in the other */
1318 if (a_sha)
1319 output(o, 2, "Removing %s", path);
1320 /* do not touch working file if it did not exist */
1321 remove_file(o, 1, path, !a_sha);
1322 } else if (string_list_has_string(&o->current_directory_set,
1323 path)) {
1324 entry->processed = 0;
1325 return 1; /* Assume clean until processed */
1326 } else {
1327 /* Deleted in one and changed in the other */
1328 clean_merge = 0;
1329 handle_delete_modify(o, path, path,
1330 a_sha, a_mode, b_sha, b_mode);
1331 }
1332
1333 } else if ((!o_sha && a_sha && !b_sha) ||
1334 (!o_sha && !a_sha && b_sha)) {
1335 /* Case B: Added in one. */
1336 unsigned mode;
1337 const unsigned char *sha;
1338
1339 if (a_sha) {
1340 mode = a_mode;
1341 sha = a_sha;
1342 } else {
1343 mode = b_mode;
1344 sha = b_sha;
1345 }
1346 if (string_list_has_string(&o->current_directory_set, path)) {
1347 /* Handle D->F conflicts after all subfiles */
1348 entry->processed = 0;
1349 return 1; /* Assume clean until processed */
1350 } else {
1351 output(o, 2, "Adding %s", path);
1352 update_file(o, 1, sha, mode, path);
1353 }
1354 } else if (a_sha && b_sha) {
1355 /* Case C: Added in both (check for same permissions) and */
1356 /* case D: Modified in both, but differently. */
1357 clean_merge = merge_content(o, path,
1358 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1359 NULL);
1360 } else if (!o_sha && !a_sha && !b_sha) {
1361 /*
1362 * this entry was deleted altogether. a_mode == 0 means
1363 * we had that path and want to actively remove it.
1364 */
1365 remove_file(o, 1, path, !a_mode);
1366 } else
1367 die("Fatal merge failure, shouldn't happen.");
1368
1369 return clean_merge;
1370 }
1371
1372 /*
1373 * Per entry merge function for D/F (and/or rename) conflicts. In the
1374 * cases we can cleanly resolve D/F conflicts, process_entry() can
1375 * clean out all the files below the directory for us. All D/F
1376 * conflict cases must be handled here at the end to make sure any
1377 * directories that can be cleaned out, are.
1378 *
1379 * Some rename conflicts may also be handled here that don't necessarily
1380 * involve D/F conflicts, since the code to handle them is generic enough
1381 * to handle those rename conflicts with or without D/F conflicts also
1382 * being involved.
1383 */
1384 static int process_df_entry(struct merge_options *o,
1385 const char *path, struct stage_data *entry)
1386 {
1387 int clean_merge = 1;
1388 unsigned o_mode = entry->stages[1].mode;
1389 unsigned a_mode = entry->stages[2].mode;
1390 unsigned b_mode = entry->stages[3].mode;
1391 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1392 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1393 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1394 struct stat st;
1395
1396 entry->processed = 1;
1397 if (entry->rename_df_conflict_info) {
1398 struct rename_df_conflict_info *conflict_info = entry->rename_df_conflict_info;
1399 char *src;
1400 switch (conflict_info->rename_type) {
1401 case RENAME_NORMAL:
1402 clean_merge = merge_content(o, path,
1403 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1404 conflict_info->branch1);
1405 break;
1406 case RENAME_DELETE:
1407 clean_merge = 0;
1408 conflict_rename_delete(o, conflict_info->pair1,
1409 conflict_info->branch1,
1410 conflict_info->branch2);
1411 break;
1412 case RENAME_ONE_FILE_TO_TWO:
1413 src = conflict_info->pair1->one->path;
1414 clean_merge = 0;
1415 output(o, 1, "CONFLICT (rename/rename): "
1416 "Rename \"%s\"->\"%s\" in branch \"%s\" "
1417 "rename \"%s\"->\"%s\" in \"%s\"%s",
1418 src, conflict_info->pair1->two->path, conflict_info->branch1,
1419 src, conflict_info->pair2->two->path, conflict_info->branch2,
1420 o->call_depth ? " (left unresolved)" : "");
1421 if (o->call_depth) {
1422 remove_file_from_cache(src);
1423 update_file(o, 0, conflict_info->pair1->one->sha1,
1424 conflict_info->pair1->one->mode, src);
1425 }
1426 conflict_rename_rename_1to2(o, conflict_info->pair1,
1427 conflict_info->branch1,
1428 conflict_info->pair2,
1429 conflict_info->branch2);
1430 conflict_info->dst_entry2->processed = 1;
1431 break;
1432 default:
1433 entry->processed = 0;
1434 break;
1435 }
1436 } else if (o_sha && (!a_sha || !b_sha)) {
1437 /* Modify/delete; deleted side may have put a directory in the way */
1438 const char *new_path = path;
1439 if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode))
1440 new_path = unique_path(o, path, a_sha ? o->branch1 : o->branch2);
1441 clean_merge = 0;
1442 handle_delete_modify(o, path, new_path,
1443 a_sha, a_mode, b_sha, b_mode);
1444 } else if (!o_sha && !!a_sha != !!b_sha) {
1445 /* directory -> (directory, file) */
1446 const char *add_branch;
1447 const char *other_branch;
1448 unsigned mode;
1449 const unsigned char *sha;
1450 const char *conf;
1451
1452 if (a_sha) {
1453 add_branch = o->branch1;
1454 other_branch = o->branch2;
1455 mode = a_mode;
1456 sha = a_sha;
1457 conf = "file/directory";
1458 } else {
1459 add_branch = o->branch2;
1460 other_branch = o->branch1;
1461 mode = b_mode;
1462 sha = b_sha;
1463 conf = "directory/file";
1464 }
1465 if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1466 const char *new_path = unique_path(o, path, add_branch);
1467 clean_merge = 0;
1468 output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. "
1469 "Adding %s as %s",
1470 conf, path, other_branch, path, new_path);
1471 update_file(o, 0, sha, mode, new_path);
1472 } else {
1473 output(o, 2, "Adding %s", path);
1474 update_file(o, 1, sha, mode, path);
1475 }
1476 } else {
1477 entry->processed = 0;
1478 return 1; /* not handled; assume clean until processed */
1479 }
1480
1481 return clean_merge;
1482 }
1483
1484 int merge_trees(struct merge_options *o,
1485 struct tree *head,
1486 struct tree *merge,
1487 struct tree *common,
1488 struct tree **result)
1489 {
1490 int code, clean;
1491
1492 if (o->subtree_shift) {
1493 merge = shift_tree_object(head, merge, o->subtree_shift);
1494 common = shift_tree_object(head, common, o->subtree_shift);
1495 }
1496
1497 if (sha_eq(common->object.sha1, merge->object.sha1)) {
1498 output(o, 0, "Already up-to-date!");
1499 *result = head;
1500 return 1;
1501 }
1502
1503 code = git_merge_trees(o->call_depth, common, head, merge);
1504
1505 if (code != 0) {
1506 if (show(o, 4) || o->call_depth)
1507 die("merging of trees %s and %s failed",
1508 sha1_to_hex(head->object.sha1),
1509 sha1_to_hex(merge->object.sha1));
1510 else
1511 exit(128);
1512 }
1513
1514 if (unmerged_cache()) {
1515 struct string_list *entries, *re_head, *re_merge;
1516 int i;
1517 string_list_clear(&o->current_file_set, 1);
1518 string_list_clear(&o->current_directory_set, 1);
1519 get_files_dirs(o, head);
1520 get_files_dirs(o, merge);
1521
1522 entries = get_unmerged();
1523 make_room_for_directories_of_df_conflicts(o, entries);
1524 re_head = get_renames(o, head, common, head, merge, entries);
1525 re_merge = get_renames(o, merge, common, head, merge, entries);
1526 clean = process_renames(o, re_head, re_merge);
1527 for (i = 0; i < entries->nr; i++) {
1528 const char *path = entries->items[i].string;
1529 struct stage_data *e = entries->items[i].util;
1530 if (!e->processed
1531 && !process_entry(o, path, e))
1532 clean = 0;
1533 }
1534 for (i = 0; i < entries->nr; i++) {
1535 const char *path = entries->items[i].string;
1536 struct stage_data *e = entries->items[i].util;
1537 if (!e->processed
1538 && !process_df_entry(o, path, e))
1539 clean = 0;
1540 }
1541 for (i = 0; i < entries->nr; i++) {
1542 struct stage_data *e = entries->items[i].util;
1543 if (!e->processed)
1544 die("Unprocessed path??? %s",
1545 entries->items[i].string);
1546 }
1547
1548 string_list_clear(re_merge, 0);
1549 string_list_clear(re_head, 0);
1550 string_list_clear(entries, 1);
1551
1552 }
1553 else
1554 clean = 1;
1555
1556 if (o->call_depth)
1557 *result = write_tree_from_memory(o);
1558
1559 return clean;
1560 }
1561
1562 static struct commit_list *reverse_commit_list(struct commit_list *list)
1563 {
1564 struct commit_list *next = NULL, *current, *backup;
1565 for (current = list; current; current = backup) {
1566 backup = current->next;
1567 current->next = next;
1568 next = current;
1569 }
1570 return next;
1571 }
1572
1573 /*
1574 * Merge the commits h1 and h2, return the resulting virtual
1575 * commit object and a flag indicating the cleanness of the merge.
1576 */
1577 int merge_recursive(struct merge_options *o,
1578 struct commit *h1,
1579 struct commit *h2,
1580 struct commit_list *ca,
1581 struct commit **result)
1582 {
1583 struct commit_list *iter;
1584 struct commit *merged_common_ancestors;
1585 struct tree *mrtree = mrtree;
1586 int clean;
1587
1588 if (show(o, 4)) {
1589 output(o, 4, "Merging:");
1590 output_commit_title(o, h1);
1591 output_commit_title(o, h2);
1592 }
1593
1594 if (!ca) {
1595 ca = get_merge_bases(h1, h2, 1);
1596 ca = reverse_commit_list(ca);
1597 }
1598
1599 if (show(o, 5)) {
1600 output(o, 5, "found %u common ancestor(s):", commit_list_count(ca));
1601 for (iter = ca; iter; iter = iter->next)
1602 output_commit_title(o, iter->item);
1603 }
1604
1605 merged_common_ancestors = pop_commit(&ca);
1606 if (merged_common_ancestors == NULL) {
1607 /* if there is no common ancestor, make an empty tree */
1608 struct tree *tree = xcalloc(1, sizeof(struct tree));
1609
1610 tree->object.parsed = 1;
1611 tree->object.type = OBJ_TREE;
1612 pretend_sha1_file(NULL, 0, OBJ_TREE, tree->object.sha1);
1613 merged_common_ancestors = make_virtual_commit(tree, "ancestor");
1614 }
1615
1616 for (iter = ca; iter; iter = iter->next) {
1617 const char *saved_b1, *saved_b2;
1618 o->call_depth++;
1619 /*
1620 * When the merge fails, the result contains files
1621 * with conflict markers. The cleanness flag is
1622 * ignored, it was never actually used, as result of
1623 * merge_trees has always overwritten it: the committed
1624 * "conflicts" were already resolved.
1625 */
1626 discard_cache();
1627 saved_b1 = o->branch1;
1628 saved_b2 = o->branch2;
1629 o->branch1 = "Temporary merge branch 1";
1630 o->branch2 = "Temporary merge branch 2";
1631 merge_recursive(o, merged_common_ancestors, iter->item,
1632 NULL, &merged_common_ancestors);
1633 o->branch1 = saved_b1;
1634 o->branch2 = saved_b2;
1635 o->call_depth--;
1636
1637 if (!merged_common_ancestors)
1638 die("merge returned no commit");
1639 }
1640
1641 discard_cache();
1642 if (!o->call_depth)
1643 read_cache();
1644
1645 o->ancestor = "merged common ancestors";
1646 clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
1647 &mrtree);
1648
1649 if (o->call_depth) {
1650 *result = make_virtual_commit(mrtree, "merged tree");
1651 commit_list_insert(h1, &(*result)->parents);
1652 commit_list_insert(h2, &(*result)->parents->next);
1653 }
1654 flush_output(o);
1655 if (o->needed_rename_limit)
1656 warning(rename_limit_advice, o->needed_rename_limit);
1657 return clean;
1658 }
1659
1660 static struct commit *get_ref(const unsigned char *sha1, const char *name)
1661 {
1662 struct object *object;
1663
1664 object = deref_tag(parse_object(sha1), name, strlen(name));
1665 if (!object)
1666 return NULL;
1667 if (object->type == OBJ_TREE)
1668 return make_virtual_commit((struct tree*)object, name);
1669 if (object->type != OBJ_COMMIT)
1670 return NULL;
1671 if (parse_commit((struct commit *)object))
1672 return NULL;
1673 return (struct commit *)object;
1674 }
1675
1676 int merge_recursive_generic(struct merge_options *o,
1677 const unsigned char *head,
1678 const unsigned char *merge,
1679 int num_base_list,
1680 const unsigned char **base_list,
1681 struct commit **result)
1682 {
1683 int clean, index_fd;
1684 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
1685 struct commit *head_commit = get_ref(head, o->branch1);
1686 struct commit *next_commit = get_ref(merge, o->branch2);
1687 struct commit_list *ca = NULL;
1688
1689 if (base_list) {
1690 int i;
1691 for (i = 0; i < num_base_list; ++i) {
1692 struct commit *base;
1693 if (!(base = get_ref(base_list[i], sha1_to_hex(base_list[i]))))
1694 return error("Could not parse object '%s'",
1695 sha1_to_hex(base_list[i]));
1696 commit_list_insert(base, &ca);
1697 }
1698 }
1699
1700 index_fd = hold_locked_index(lock, 1);
1701 clean = merge_recursive(o, head_commit, next_commit, ca,
1702 result);
1703 if (active_cache_changed &&
1704 (write_cache(index_fd, active_cache, active_nr) ||
1705 commit_locked_index(lock)))
1706 return error("Unable to write index.");
1707
1708 return clean ? 0 : 1;
1709 }
1710
1711 static int merge_recursive_config(const char *var, const char *value, void *cb)
1712 {
1713 struct merge_options *o = cb;
1714 if (!strcasecmp(var, "merge.verbosity")) {
1715 o->verbosity = git_config_int(var, value);
1716 return 0;
1717 }
1718 if (!strcasecmp(var, "diff.renamelimit")) {
1719 o->diff_rename_limit = git_config_int(var, value);
1720 return 0;
1721 }
1722 if (!strcasecmp(var, "merge.renamelimit")) {
1723 o->merge_rename_limit = git_config_int(var, value);
1724 return 0;
1725 }
1726 return git_xmerge_config(var, value, cb);
1727 }
1728
1729 void init_merge_options(struct merge_options *o)
1730 {
1731 memset(o, 0, sizeof(struct merge_options));
1732 o->verbosity = 2;
1733 o->buffer_output = 1;
1734 o->diff_rename_limit = -1;
1735 o->merge_rename_limit = -1;
1736 o->renormalize = 0;
1737 git_config(merge_recursive_config, o);
1738 if (getenv("GIT_MERGE_VERBOSITY"))
1739 o->verbosity =
1740 strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10);
1741 if (o->verbosity >= 5)
1742 o->buffer_output = 0;
1743 strbuf_init(&o->obuf, 0);
1744 memset(&o->current_file_set, 0, sizeof(struct string_list));
1745 o->current_file_set.strdup_strings = 1;
1746 memset(&o->current_directory_set, 0, sizeof(struct string_list));
1747 o->current_directory_set.strdup_strings = 1;
1748 }
1749
1750 int parse_merge_opt(struct merge_options *o, const char *s)
1751 {
1752 if (!s || !*s)
1753 return -1;
1754 if (!strcmp(s, "ours"))
1755 o->recursive_variant = MERGE_RECURSIVE_OURS;
1756 else if (!strcmp(s, "theirs"))
1757 o->recursive_variant = MERGE_RECURSIVE_THEIRS;
1758 else if (!strcmp(s, "subtree"))
1759 o->subtree_shift = "";
1760 else if (!prefixcmp(s, "subtree="))
1761 o->subtree_shift = s + strlen("subtree=");
1762 else if (!strcmp(s, "patience"))
1763 o->xdl_opts |= XDF_PATIENCE_DIFF;
1764 else if (!strcmp(s, "ignore-space-change"))
1765 o->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
1766 else if (!strcmp(s, "ignore-all-space"))
1767 o->xdl_opts |= XDF_IGNORE_WHITESPACE;
1768 else if (!strcmp(s, "ignore-space-at-eol"))
1769 o->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
1770 else if (!strcmp(s, "renormalize"))
1771 o->renormalize = 1;
1772 else if (!strcmp(s, "no-renormalize"))
1773 o->renormalize = 0;
1774 else if (!prefixcmp(s, "rename-threshold=")) {
1775 const char *score = s + strlen("rename-threshold=");
1776 if ((o->rename_score = parse_rename_score(&score)) == -1 || *score != 0)
1777 return -1;
1778 }
1779 else
1780 return -1;
1781 return 0;
1782 }
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