418246376b78d050a7f38b9ae6820ee188cf5cec
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"
24static struct tree *shift_tree_object(struct tree *one, struct tree *two,
26 const char *subtree_shift)
27{
28 unsigned char shifted[20];
29 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/*
42 * A virtual commit has (const char *)commit->util set to the name.
43 */
44static 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/*
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 */
59static 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}
65enum rename_type {
67 RENAME_NORMAL = 0,
68 RENAME_DELETE,
69 RENAME_ONE_FILE_TO_TWO
70};
71struct 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/*
83 * Since we want to write the index eventually, we cannot reuse the index
84 * for these (temporary) data.
85 */
86struct 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};
94static 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 ci->dst_entry1 = dst_entry1;
110 dst_entry1->rename_df_conflict_info = ci;
111 dst_entry1->processed = 0;
112 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}
121static int show(struct merge_options *o, int v)
123{
124 return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5;
125}
126static 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__attribute__((format (printf, 3, 4)))
136static void output(struct merge_options *o, int v, const char *fmt, ...)
137{
138 va_list ap;
139 if (!show(o, v))
141 return;
142 strbuf_grow(&o->obuf, o->call_depth * 2 + 2);
144 memset(o->obuf.buf + o->obuf.len, ' ', o->call_depth * 2);
145 strbuf_setlen(&o->obuf, o->obuf.len + o->call_depth * 2);
146 va_start(ap, fmt);
148 strbuf_vaddf(&o->obuf, fmt, ap);
149 va_end(ap);
150 strbuf_add(&o->obuf, "\n", 1);
152 if (!o->buffer_output)
153 flush_output(o);
154}
155static void output_commit_title(struct merge_options *o, struct commit *commit)
157{
158 int i;
159 flush_output(o);
160 for (i = o->call_depth; i--;)
161 fputs(" ", stdout);
162 if (commit->util)
163 printf("virtual %s\n", (char *)commit->util);
164 else {
165 printf("%s ", find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV));
166 if (parse_commit(commit) != 0)
167 printf("(bad commit)\n");
168 else {
169 const char *title;
170 int len = find_commit_subject(commit->buffer, &title);
171 if (len)
172 printf("%.*s\n", len, title);
173 }
174 }
175}
176static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
178 const char *path, int stage, int refresh, int options)
179{
180 struct cache_entry *ce;
181 ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage, refresh);
182 if (!ce)
183 return error("addinfo_cache failed for path '%s'", path);
184 return add_cache_entry(ce, options);
185}
186static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree)
188{
189 parse_tree(tree);
190 init_tree_desc(desc, tree->buffer, tree->size);
191}
192static int git_merge_trees(int index_only,
194 struct tree *common,
195 struct tree *head,
196 struct tree *merge)
197{
198 int rc;
199 struct tree_desc t[3];
200 struct unpack_trees_options opts;
201 memset(&opts, 0, sizeof(opts));
203 if (index_only)
204 opts.index_only = 1;
205 else
206 opts.update = 1;
207 opts.merge = 1;
208 opts.head_idx = 2;
209 opts.fn = threeway_merge;
210 opts.src_index = &the_index;
211 opts.dst_index = &the_index;
212 setup_unpack_trees_porcelain(&opts, "merge");
213 init_tree_desc_from_tree(t+0, common);
215 init_tree_desc_from_tree(t+1, head);
216 init_tree_desc_from_tree(t+2, merge);
217 rc = unpack_trees(3, t, &opts);
219 cache_tree_free(&active_cache_tree);
220 return rc;
221}
222struct tree *write_tree_from_memory(struct merge_options *o)
224{
225 struct tree *result = NULL;
226 if (unmerged_cache()) {
228 int i;
229 fprintf(stderr, "BUG: There are unmerged index entries:\n");
230 for (i = 0; i < active_nr; i++) {
231 struct cache_entry *ce = active_cache[i];
232 if (ce_stage(ce))
233 fprintf(stderr, "BUG: %d %.*s\n", ce_stage(ce),
234 (int)ce_namelen(ce), ce->name);
235 }
236 die("Bug in merge-recursive.c");
237 }
238 if (!active_cache_tree)
240 active_cache_tree = cache_tree();
241 if (!cache_tree_fully_valid(active_cache_tree) &&
243 cache_tree_update(active_cache_tree,
244 active_cache, active_nr, 0, 0) < 0)
245 die("error building trees");
246 result = lookup_tree(active_cache_tree->sha1);
248 return result;
250}
251static int save_files_dirs(const unsigned char *sha1,
253 const char *base, int baselen, const char *path,
254 unsigned int mode, int stage, void *context)
255{
256 int len = strlen(path);
257 char *newpath = xmalloc(baselen + len + 1);
258 struct merge_options *o = context;
259 memcpy(newpath, base, baselen);
261 memcpy(newpath + baselen, path, len);
262 newpath[baselen + len] = '\0';
263 if (S_ISDIR(mode))
265 string_list_insert(&o->current_directory_set, newpath);
266 else
267 string_list_insert(&o->current_file_set, newpath);
268 free(newpath);
269 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
271}
272static int get_files_dirs(struct merge_options *o, struct tree *tree)
274{
275 int n;
276 if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs, o))
277 return 0;
278 n = o->current_file_set.nr + o->current_directory_set.nr;
279 return n;
280}
281/*
283 * Returns an index_entry instance which doesn't have to correspond to
284 * a real cache entry in Git's index.
285 */
286static struct stage_data *insert_stage_data(const char *path,
287 struct tree *o, struct tree *a, struct tree *b,
288 struct string_list *entries)
289{
290 struct string_list_item *item;
291 struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
292 get_tree_entry(o->object.sha1, path,
293 e->stages[1].sha, &e->stages[1].mode);
294 get_tree_entry(a->object.sha1, path,
295 e->stages[2].sha, &e->stages[2].mode);
296 get_tree_entry(b->object.sha1, path,
297 e->stages[3].sha, &e->stages[3].mode);
298 item = string_list_insert(entries, path);
299 item->util = e;
300 return e;
301}
302/*
304 * Create a dictionary mapping file names to stage_data objects. The
305 * dictionary contains one entry for every path with a non-zero stage entry.
306 */
307static struct string_list *get_unmerged(void)
308{
309 struct string_list *unmerged = xcalloc(1, sizeof(struct string_list));
310 int i;
311 unmerged->strdup_strings = 1;
313 for (i = 0; i < active_nr; i++) {
315 struct string_list_item *item;
316 struct stage_data *e;
317 struct cache_entry *ce = active_cache[i];
318 if (!ce_stage(ce))
319 continue;
320 item = string_list_lookup(unmerged, ce->name);
322 if (!item) {
323 item = string_list_insert(unmerged, ce->name);
324 item->util = xcalloc(1, sizeof(struct stage_data));
325 }
326 e = item->util;
327 e->stages[ce_stage(ce)].mode = ce->ce_mode;
328 hashcpy(e->stages[ce_stage(ce)].sha, ce->sha1);
329 }
330 return unmerged;
332}
333static void make_room_for_directories_of_df_conflicts(struct merge_options *o,
335 struct string_list *entries)
336{
337 /* If there are D/F conflicts, and the paths currently exist
338 * in the working copy as a file, we want to remove them to
339 * make room for the corresponding directory. Such paths will
340 * later be processed in process_df_entry() at the end. If
341 * the corresponding directory ends up being removed by the
342 * merge, then the file will be reinstated at that time;
343 * otherwise, if the file is not supposed to be removed by the
344 * merge, the contents of the file will be placed in another
345 * unique filename.
346 *
347 * NOTE: This function relies on the fact that entries for a
348 * D/F conflict will appear adjacent in the index, with the
349 * entries for the file appearing before entries for paths
350 * below the corresponding directory.
351 */
352 const char *last_file = NULL;
353 int last_len = 0;
354 int i;
355 /*
357 * If we're merging merge-bases, we don't want to bother with
358 * any working directory changes.
359 */
360 if (o->call_depth)
361 return;
362 for (i = 0; i < entries->nr; i++) {
364 const char *path = entries->items[i].string;
365 int len = strlen(path);
366 struct stage_data *e = entries->items[i].util;
367 /*
369 * Check if last_file & path correspond to a D/F conflict;
370 * i.e. whether path is last_file+'/'+<something>.
371 * If so, remove last_file to make room for path and friends.
372 */
373 if (last_file &&
374 len > last_len &&
375 memcmp(path, last_file, last_len) == 0 &&
376 path[last_len] == '/') {
377 output(o, 3, "Removing %s to make room for subdirectory; may re-add later.", last_file);
378 unlink(last_file);
379 }
380 /*
382 * Determine whether path could exist as a file in the
383 * working directory as a possible D/F conflict. This
384 * will only occur when it exists in stage 2 as a
385 * file.
386 */
387 if (S_ISREG(e->stages[2].mode) || S_ISLNK(e->stages[2].mode)) {
388 last_file = path;
389 last_len = len;
390 } else {
391 last_file = NULL;
392 }
393 }
394}
395struct rename {
397 struct diff_filepair *pair;
398 struct stage_data *src_entry;
399 struct stage_data *dst_entry;
400 unsigned processed:1;
401};
402/*
404 * Get information of all renames which occurred between 'o_tree' and
405 * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
406 * 'b_tree') to be able to associate the correct cache entries with
407 * the rename information. 'tree' is always equal to either a_tree or b_tree.
408 */
409static struct string_list *get_renames(struct merge_options *o,
410 struct tree *tree,
411 struct tree *o_tree,
412 struct tree *a_tree,
413 struct tree *b_tree,
414 struct string_list *entries)
415{
416 int i;
417 struct string_list *renames;
418 struct diff_options opts;
419 renames = xcalloc(1, sizeof(struct string_list));
421 diff_setup(&opts);
422 DIFF_OPT_SET(&opts, RECURSIVE);
423 opts.detect_rename = DIFF_DETECT_RENAME;
424 opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
425 o->diff_rename_limit >= 0 ? o->diff_rename_limit :
426 1000;
427 opts.rename_score = o->rename_score;
428 opts.show_rename_progress = o->show_rename_progress;
429 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
430 if (diff_setup_done(&opts) < 0)
431 die("diff setup failed");
432 diff_tree_sha1(o_tree->object.sha1, tree->object.sha1, "", &opts);
433 diffcore_std(&opts);
434 if (opts.needed_rename_limit > o->needed_rename_limit)
435 o->needed_rename_limit = opts.needed_rename_limit;
436 for (i = 0; i < diff_queued_diff.nr; ++i) {
437 struct string_list_item *item;
438 struct rename *re;
439 struct diff_filepair *pair = diff_queued_diff.queue[i];
440 if (pair->status != 'R') {
441 diff_free_filepair(pair);
442 continue;
443 }
444 re = xmalloc(sizeof(*re));
445 re->processed = 0;
446 re->pair = pair;
447 item = string_list_lookup(entries, re->pair->one->path);
448 if (!item)
449 re->src_entry = insert_stage_data(re->pair->one->path,
450 o_tree, a_tree, b_tree, entries);
451 else
452 re->src_entry = item->util;
453 item = string_list_lookup(entries, re->pair->two->path);
455 if (!item)
456 re->dst_entry = insert_stage_data(re->pair->two->path,
457 o_tree, a_tree, b_tree, entries);
458 else
459 re->dst_entry = item->util;
460 item = string_list_insert(renames, pair->one->path);
461 item->util = re;
462 }
463 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
464 diff_queued_diff.nr = 0;
465 diff_flush(&opts);
466 return renames;
467}
468static int update_stages(const char *path, const struct diff_filespec *o,
470 const struct diff_filespec *a,
471 const struct diff_filespec *b)
472{
473 int clear = 1;
474 int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_SKIP_DFCHECK;
475 if (clear)
476 if (remove_file_from_cache(path))
477 return -1;
478 if (o)
479 if (add_cacheinfo(o->mode, o->sha1, path, 1, 0, options))
480 return -1;
481 if (a)
482 if (add_cacheinfo(a->mode, a->sha1, path, 2, 0, options))
483 return -1;
484 if (b)
485 if (add_cacheinfo(b->mode, b->sha1, path, 3, 0, options))
486 return -1;
487 return 0;
488}
489static int update_stages_and_entry(const char *path,
491 struct stage_data *entry,
492 struct diff_filespec *o,
493 struct diff_filespec *a,
494 struct diff_filespec *b,
495 int clear)
496{
497 int options;
498 entry->processed = 0;
500 entry->stages[1].mode = o->mode;
501 entry->stages[2].mode = a->mode;
502 entry->stages[3].mode = b->mode;
503 hashcpy(entry->stages[1].sha, o->sha1);
504 hashcpy(entry->stages[2].sha, a->sha1);
505 hashcpy(entry->stages[3].sha, b->sha1);
506 return update_stages(path, o, a, b);
507}
508static int remove_file(struct merge_options *o, int clean,
510 const char *path, int no_wd)
511{
512 int update_cache = o->call_depth || clean;
513 int update_working_directory = !o->call_depth && !no_wd;
514 if (update_cache) {
516 if (remove_file_from_cache(path))
517 return -1;
518 }
519 if (update_working_directory) {
520 if (remove_path(path))
521 return -1;
522 }
523 return 0;
524}
525static char *unique_path(struct merge_options *o, const char *path, const char *branch)
527{
528 char *newpath = xmalloc(strlen(path) + 1 + strlen(branch) + 8 + 1);
529 int suffix = 0;
530 struct stat st;
531 char *p = newpath + strlen(path);
532 strcpy(newpath, path);
533 *(p++) = '~';
534 strcpy(p, branch);
535 for (; *p; ++p)
536 if ('/' == *p)
537 *p = '_';
538 while (string_list_has_string(&o->current_file_set, newpath) ||
539 string_list_has_string(&o->current_directory_set, newpath) ||
540 lstat(newpath, &st) == 0)
541 sprintf(p, "_%d", suffix++);
542 string_list_insert(&o->current_file_set, newpath);
544 return newpath;
545}
546static void flush_buffer(int fd, const char *buf, unsigned long size)
548{
549 while (size > 0) {
550 long ret = write_in_full(fd, buf, size);
551 if (ret < 0) {
552 /* Ignore epipe */
553 if (errno == EPIPE)
554 break;
555 die_errno("merge-recursive");
556 } else if (!ret) {
557 die("merge-recursive: disk full?");
558 }
559 size -= ret;
560 buf += ret;
561 }
562}
563static int would_lose_untracked(const char *path)
565{
566 int pos = cache_name_pos(path, strlen(path));
567 if (pos < 0)
569 pos = -1 - pos;
570 while (pos < active_nr &&
571 !strcmp(path, active_cache[pos]->name)) {
572 /*
573 * If stage #0, it is definitely tracked.
574 * If it has stage #2 then it was tracked
575 * before this merge started. All other
576 * cases the path was not tracked.
577 */
578 switch (ce_stage(active_cache[pos])) {
579 case 0:
580 case 2:
581 return 0;
582 }
583 pos++;
584 }
585 return file_exists(path);
586}
587static int make_room_for_path(const char *path)
589{
590 int status;
591 const char *msg = "failed to create path '%s'%s";
592 status = safe_create_leading_directories_const(path);
594 if (status) {
595 if (status == -3) {
596 /* something else exists */
597 error(msg, path, ": perhaps a D/F conflict?");
598 return -1;
599 }
600 die(msg, path, "");
601 }
602 /*
604 * Do not unlink a file in the work tree if we are not
605 * tracking it.
606 */
607 if (would_lose_untracked(path))
608 return error("refusing to lose untracked file at '%s'",
609 path);
610 /* Successful unlink is good.. */
612 if (!unlink(path))
613 return 0;
614 /* .. and so is no existing file */
615 if (errno == ENOENT)
616 return 0;
617 /* .. but not some other error (who really cares what?) */
618 return error(msg, path, ": perhaps a D/F conflict?");
619}
620static void update_file_flags(struct merge_options *o,
622 const unsigned char *sha,
623 unsigned mode,
624 const char *path,
625 int update_cache,
626 int update_wd)
627{
628 if (o->call_depth)
629 update_wd = 0;
630 if (update_wd) {
632 enum object_type type;
633 void *buf;
634 unsigned long size;
635 if (S_ISGITLINK(mode)) {
637 /*
638 * We may later decide to recursively descend into
639 * the submodule directory and update its index
640 * and/or work tree, but we do not do that now.
641 */
642 update_wd = 0;
643 goto update_index;
644 }
645 buf = read_sha1_file(sha, &type, &size);
647 if (!buf)
648 die("cannot read object %s '%s'", sha1_to_hex(sha), path);
649 if (type != OBJ_BLOB)
650 die("blob expected for %s '%s'", sha1_to_hex(sha), path);
651 if (S_ISREG(mode)) {
652 struct strbuf strbuf = STRBUF_INIT;
653 if (convert_to_working_tree(path, buf, size, &strbuf)) {
654 free(buf);
655 size = strbuf.len;
656 buf = strbuf_detach(&strbuf, NULL);
657 }
658 }
659 if (make_room_for_path(path) < 0) {
661 update_wd = 0;
662 free(buf);
663 goto update_index;
664 }
665 if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
666 int fd;
667 if (mode & 0100)
668 mode = 0777;
669 else
670 mode = 0666;
671 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
672 if (fd < 0)
673 die_errno("failed to open '%s'", path);
674 flush_buffer(fd, buf, size);
675 close(fd);
676 } else if (S_ISLNK(mode)) {
677 char *lnk = xmemdupz(buf, size);
678 safe_create_leading_directories_const(path);
679 unlink(path);
680 if (symlink(lnk, path))
681 die_errno("failed to symlink '%s'", path);
682 free(lnk);
683 } else
684 die("do not know what to do with %06o %s '%s'",
685 mode, sha1_to_hex(sha), path);
686 free(buf);
687 }
688 update_index:
689 if (update_cache)
690 add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
691}
692static void update_file(struct merge_options *o,
694 int clean,
695 const unsigned char *sha,
696 unsigned mode,
697 const char *path)
698{
699 update_file_flags(o, sha, mode, path, o->call_depth || clean, !o->call_depth);
700}
701/* Low level file merging, update and removal */
703struct merge_file_info {
705 unsigned char sha[20];
706 unsigned mode;
707 unsigned clean:1,
708 merge:1;
709};
710static int merge_3way(struct merge_options *o,
712 mmbuffer_t *result_buf,
713 const struct diff_filespec *one,
714 const struct diff_filespec *a,
715 const struct diff_filespec *b,
716 const char *branch1,
717 const char *branch2)
718{
719 mmfile_t orig, src1, src2;
720 struct ll_merge_options ll_opts = {0};
721 char *base_name, *name1, *name2;
722 int merge_status;
723 ll_opts.renormalize = o->renormalize;
725 ll_opts.xdl_opts = o->xdl_opts;
726 if (o->call_depth) {
728 ll_opts.virtual_ancestor = 1;
729 ll_opts.variant = 0;
730 } else {
731 switch (o->recursive_variant) {
732 case MERGE_RECURSIVE_OURS:
733 ll_opts.variant = XDL_MERGE_FAVOR_OURS;
734 break;
735 case MERGE_RECURSIVE_THEIRS:
736 ll_opts.variant = XDL_MERGE_FAVOR_THEIRS;
737 break;
738 default:
739 ll_opts.variant = 0;
740 break;
741 }
742 }
743 if (strcmp(a->path, b->path) ||
745 (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) {
746 base_name = o->ancestor == NULL ? NULL :
747 xstrdup(mkpath("%s:%s", o->ancestor, one->path));
748 name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
749 name2 = xstrdup(mkpath("%s:%s", branch2, b->path));
750 } else {
751 base_name = o->ancestor == NULL ? NULL :
752 xstrdup(mkpath("%s", o->ancestor));
753 name1 = xstrdup(mkpath("%s", branch1));
754 name2 = xstrdup(mkpath("%s", branch2));
755 }
756 read_mmblob(&orig, one->sha1);
758 read_mmblob(&src1, a->sha1);
759 read_mmblob(&src2, b->sha1);
760 merge_status = ll_merge(result_buf, a->path, &orig, base_name,
762 &src1, name1, &src2, name2, &ll_opts);
763 free(name1);
765 free(name2);
766 free(orig.ptr);
767 free(src1.ptr);
768 free(src2.ptr);
769 return merge_status;
770}
771static struct merge_file_info merge_file(struct merge_options *o,
773 const struct diff_filespec *one,
774 const struct diff_filespec *a,
775 const struct diff_filespec *b,
776 const char *branch1,
777 const char *branch2)
778{
779 struct merge_file_info result;
780 result.merge = 0;
781 result.clean = 1;
782 if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) {
784 result.clean = 0;
785 if (S_ISREG(a->mode)) {
786 result.mode = a->mode;
787 hashcpy(result.sha, a->sha1);
788 } else {
789 result.mode = b->mode;
790 hashcpy(result.sha, b->sha1);
791 }
792 } else {
793 if (!sha_eq(a->sha1, one->sha1) && !sha_eq(b->sha1, one->sha1))
794 result.merge = 1;
795 /*
797 * Merge modes
798 */
799 if (a->mode == b->mode || a->mode == one->mode)
800 result.mode = b->mode;
801 else {
802 result.mode = a->mode;
803 if (b->mode != one->mode) {
804 result.clean = 0;
805 result.merge = 1;
806 }
807 }
808 if (sha_eq(a->sha1, b->sha1) || sha_eq(a->sha1, one->sha1))
810 hashcpy(result.sha, b->sha1);
811 else if (sha_eq(b->sha1, one->sha1))
812 hashcpy(result.sha, a->sha1);
813 else if (S_ISREG(a->mode)) {
814 mmbuffer_t result_buf;
815 int merge_status;
816 merge_status = merge_3way(o, &result_buf, one, a, b,
818 branch1, branch2);
819 if ((merge_status < 0) || !result_buf.ptr)
821 die("Failed to execute internal merge");
822 if (write_sha1_file(result_buf.ptr, result_buf.size,
824 blob_type, result.sha))
825 die("Unable to add %s to database",
826 a->path);
827 free(result_buf.ptr);
829 result.clean = (merge_status == 0);
830 } else if (S_ISGITLINK(a->mode)) {
831 result.clean = merge_submodule(result.sha, one->path, one->sha1,
832 a->sha1, b->sha1);
833 } else if (S_ISLNK(a->mode)) {
834 hashcpy(result.sha, a->sha1);
835 if (!sha_eq(a->sha1, b->sha1))
837 result.clean = 0;
838 } else {
839 die("unsupported object type in the tree");
840 }
841 }
842 return result;
844}
845static void conflict_rename_delete(struct merge_options *o,
847 struct diff_filepair *pair,
848 const char *rename_branch,
849 const char *other_branch)
850{
851 char *dest_name = pair->two->path;
852 int df_conflict = 0;
853 struct stat st;
854 output(o, 1, "CONFLICT (rename/delete): Rename %s->%s in %s "
856 "and deleted in %s",
857 pair->one->path, pair->two->path, rename_branch,
858 other_branch);
859 if (!o->call_depth)
860 update_stages(dest_name, NULL,
861 rename_branch == o->branch1 ? pair->two : NULL,
862 rename_branch == o->branch1 ? NULL : pair->two);
863 if (lstat(dest_name, &st) == 0 && S_ISDIR(st.st_mode)) {
864 dest_name = unique_path(o, dest_name, rename_branch);
865 df_conflict = 1;
866 }
867 update_file(o, 0, pair->two->sha1, pair->two->mode, dest_name);
868 if (df_conflict)
869 free(dest_name);
870}
871static void conflict_rename_rename_1to2(struct merge_options *o,
873 struct diff_filepair *pair1,
874 const char *branch1,
875 struct diff_filepair *pair2,
876 const char *branch2)
877{
878 /* One file was renamed in both branches, but to different names. */
879 char *del[2];
880 int delp = 0;
881 const char *ren1_dst = pair1->two->path;
882 const char *ren2_dst = pair2->two->path;
883 const char *dst_name1 = ren1_dst;
884 const char *dst_name2 = ren2_dst;
885 struct stat st;
886 if (lstat(ren1_dst, &st) == 0 && S_ISDIR(st.st_mode)) {
887 dst_name1 = del[delp++] = unique_path(o, ren1_dst, branch1);
888 output(o, 1, "%s is a directory in %s adding as %s instead",
889 ren1_dst, branch2, dst_name1);
890 }
891 if (lstat(ren2_dst, &st) == 0 && S_ISDIR(st.st_mode)) {
892 dst_name2 = del[delp++] = unique_path(o, ren2_dst, branch2);
893 output(o, 1, "%s is a directory in %s adding as %s instead",
894 ren2_dst, branch1, dst_name2);
895 }
896 if (o->call_depth) {
897 remove_file_from_cache(dst_name1);
898 remove_file_from_cache(dst_name2);
899 /*
900 * Uncomment to leave the conflicting names in the resulting tree
901 *
902 * update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1);
903 * update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2);
904 */
905 } else {
906 update_stages(ren1_dst, NULL, pair1->two, NULL);
907 update_stages(ren2_dst, NULL, NULL, pair2->two);
908 update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1);
910 update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2);
911 }
912 while (delp--)
913 free(del[delp]);
914}
915static void conflict_rename_rename_2to1(struct merge_options *o,
917 struct rename *ren1,
918 const char *branch1,
919 struct rename *ren2,
920 const char *branch2)
921{
922 /* Two files were renamed to the same thing. */
923 char *new_path1 = unique_path(o, ren1->pair->two->path, branch1);
924 char *new_path2 = unique_path(o, ren2->pair->two->path, branch2);
925 output(o, 1, "Renaming %s to %s and %s to %s instead",
926 ren1->pair->one->path, new_path1,
927 ren2->pair->one->path, new_path2);
928 remove_file(o, 0, ren1->pair->two->path, 0);
929 update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path1);
930 update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, new_path2);
931 free(new_path2);
932 free(new_path1);
933}
934static int process_renames(struct merge_options *o,
936 struct string_list *a_renames,
937 struct string_list *b_renames)
938{
939 int clean_merge = 1, i, j;
940 struct string_list a_by_dst = STRING_LIST_INIT_NODUP;
941 struct string_list b_by_dst = STRING_LIST_INIT_NODUP;
942 const struct rename *sre;
943 for (i = 0; i < a_renames->nr; i++) {
945 sre = a_renames->items[i].util;
946 string_list_insert(&a_by_dst, sre->pair->two->path)->util
947 = sre->dst_entry;
948 }
949 for (i = 0; i < b_renames->nr; i++) {
950 sre = b_renames->items[i].util;
951 string_list_insert(&b_by_dst, sre->pair->two->path)->util
952 = sre->dst_entry;
953 }
954 for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
956 struct string_list *renames1, *renames2Dst;
957 struct rename *ren1 = NULL, *ren2 = NULL;
958 const char *branch1, *branch2;
959 const char *ren1_src, *ren1_dst;
960 if (i >= a_renames->nr) {
962 ren2 = b_renames->items[j++].util;
963 } else if (j >= b_renames->nr) {
964 ren1 = a_renames->items[i++].util;
965 } else {
966 int compare = strcmp(a_renames->items[i].string,
967 b_renames->items[j].string);
968 if (compare <= 0)
969 ren1 = a_renames->items[i++].util;
970 if (compare >= 0)
971 ren2 = b_renames->items[j++].util;
972 }
973 /* TODO: refactor, so that 1/2 are not needed */
975 if (ren1) {
976 renames1 = a_renames;
977 renames2Dst = &b_by_dst;
978 branch1 = o->branch1;
979 branch2 = o->branch2;
980 } else {
981 struct rename *tmp;
982 renames1 = b_renames;
983 renames2Dst = &a_by_dst;
984 branch1 = o->branch2;
985 branch2 = o->branch1;
986 tmp = ren2;
987 ren2 = ren1;
988 ren1 = tmp;
989 }
990 ren1->dst_entry->processed = 1;
992 ren1->src_entry->processed = 1;
993 if (ren1->processed)
995 continue;
996 ren1->processed = 1;
997 ren1_src = ren1->pair->one->path;
999 ren1_dst = ren1->pair->two->path;
1000 if (ren2) {
1002 const char *ren2_src = ren2->pair->one->path;
1003 const char *ren2_dst = ren2->pair->two->path;
1004 /* Renamed in 1 and renamed in 2 */
1005 if (strcmp(ren1_src, ren2_src) != 0)
1006 die("ren1.src != ren2.src");
1007 ren2->dst_entry->processed = 1;
1008 ren2->processed = 1;
1009 if (strcmp(ren1_dst, ren2_dst) != 0) {
1010 setup_rename_df_conflict_info(RENAME_ONE_FILE_TO_TWO,
1011 ren1->pair,
1012 ren2->pair,
1013 branch1,
1014 branch2,
1015 ren1->dst_entry,
1016 ren2->dst_entry);
1017 } else {
1018 remove_file(o, 1, ren1_src, 1);
1019 update_stages_and_entry(ren1_dst,
1020 ren1->dst_entry,
1021 ren1->pair->one,
1022 ren1->pair->two,
1023 ren2->pair->two,
1024 1 /* clear */);
1025 }
1026 } else {
1027 /* Renamed in 1, maybe changed in 2 */
1028 struct string_list_item *item;
1029 /* we only use sha1 and mode of these */
1030 struct diff_filespec src_other, dst_other;
1031 int try_merge;
1032 /*
1034 * unpack_trees loads entries from common-commit
1035 * into stage 1, from head-commit into stage 2, and
1036 * from merge-commit into stage 3. We keep track
1037 * of which side corresponds to the rename.
1038 */
1039 int renamed_stage = a_renames == renames1 ? 2 : 3;
1040 int other_stage = a_renames == renames1 ? 3 : 2;
1041 remove_file(o, 1, ren1_src, o->call_depth || renamed_stage == 2);
1043 hashcpy(src_other.sha1, ren1->src_entry->stages[other_stage].sha);
1045 src_other.mode = ren1->src_entry->stages[other_stage].mode;
1046 hashcpy(dst_other.sha1, ren1->dst_entry->stages[other_stage].sha);
1047 dst_other.mode = ren1->dst_entry->stages[other_stage].mode;
1048 try_merge = 0;
1049 if (sha_eq(src_other.sha1, null_sha1)) {
1051 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
1052 ren1->dst_entry->processed = 0;
1053 setup_rename_df_conflict_info(RENAME_DELETE,
1054 ren1->pair,
1055 NULL,
1056 branch1,
1057 branch2,
1058 ren1->dst_entry,
1059 NULL);
1060 } else {
1061 clean_merge = 0;
1062 conflict_rename_delete(o, ren1->pair, branch1, branch2);
1063 }
1064 } else if ((dst_other.mode == ren1->pair->two->mode) &&
1065 sha_eq(dst_other.sha1, ren1->pair->two->sha1)) {
1066 /* Added file on the other side
1067 identical to the file being
1068 renamed: clean merge */
1069 update_file(o, 1, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst);
1070 } else if (!sha_eq(dst_other.sha1, null_sha1)) {
1071 clean_merge = 0;
1072 try_merge = 1;
1073 output(o, 1, "CONFLICT (rename/add): Rename %s->%s in %s. "
1074 "%s added in %s",
1075 ren1_src, ren1_dst, branch1,
1076 ren1_dst, branch2);
1077 if (o->call_depth) {
1078 struct merge_file_info mfi;
1079 struct diff_filespec one, a, b;
1080 one.path = a.path = b.path =
1082 (char *)ren1_dst;
1083 hashcpy(one.sha1, null_sha1);
1084 one.mode = 0;
1085 hashcpy(a.sha1, ren1->pair->two->sha1);
1086 a.mode = ren1->pair->two->mode;
1087 hashcpy(b.sha1, dst_other.sha1);
1088 b.mode = dst_other.mode;
1089 mfi = merge_file(o, &one, &a, &b,
1090 branch1,
1091 branch2);
1092 output(o, 1, "Adding merged %s", ren1_dst);
1093 update_file(o, 0,
1094 mfi.sha,
1095 mfi.mode,
1096 ren1_dst);
1097 try_merge = 0;
1098 } else {
1099 char *new_path = unique_path(o, ren1_dst, branch2);
1100 output(o, 1, "Adding as %s instead", new_path);
1101 update_file(o, 0, dst_other.sha1, dst_other.mode, new_path);
1102 free(new_path);
1103 }
1104 } else if ((item = string_list_lookup(renames2Dst, ren1_dst))) {
1105 ren2 = item->util;
1106 clean_merge = 0;
1107 ren2->processed = 1;
1108 output(o, 1, "CONFLICT (rename/rename): "
1109 "Rename %s->%s in %s. "
1110 "Rename %s->%s in %s",
1111 ren1_src, ren1_dst, branch1,
1112 ren2->pair->one->path, ren2->pair->two->path, branch2);
1113 conflict_rename_rename_2to1(o, ren1, branch1, ren2, branch2);
1114 } else
1115 try_merge = 1;
1116 if (try_merge) {
1118 struct diff_filespec *one, *a, *b;
1119 src_other.path = (char *)ren1_src;
1120 one = ren1->pair->one;
1122 if (a_renames == renames1) {
1123 a = ren1->pair->two;
1124 b = &src_other;
1125 } else {
1126 b = ren1->pair->two;
1127 a = &src_other;
1128 }
1129 update_stages_and_entry(ren1_dst, ren1->dst_entry, one, a, b, 1);
1130 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
1131 setup_rename_df_conflict_info(RENAME_NORMAL,
1132 ren1->pair,
1133 NULL,
1134 branch1,
1135 NULL,
1136 ren1->dst_entry,
1137 NULL);
1138 }
1139 }
1140 }
1141 }
1142 string_list_clear(&a_by_dst, 0);
1143 string_list_clear(&b_by_dst, 0);
1144 return clean_merge;
1146}
1147static unsigned char *stage_sha(const unsigned char *sha, unsigned mode)
1149{
1150 return (is_null_sha1(sha) || mode == 0) ? NULL: (unsigned char *)sha;
1151}
1152static int read_sha1_strbuf(const unsigned char *sha1, struct strbuf *dst)
1154{
1155 void *buf;
1156 enum object_type type;
1157 unsigned long size;
1158 buf = read_sha1_file(sha1, &type, &size);
1159 if (!buf)
1160 return error("cannot read object %s", sha1_to_hex(sha1));
1161 if (type != OBJ_BLOB) {
1162 free(buf);
1163 return error("object %s is not a blob", sha1_to_hex(sha1));
1164 }
1165 strbuf_attach(dst, buf, size, size + 1);
1166 return 0;
1167}
1168static int blob_unchanged(const unsigned char *o_sha,
1170 const unsigned char *a_sha,
1171 int renormalize, const char *path)
1172{
1173 struct strbuf o = STRBUF_INIT;
1174 struct strbuf a = STRBUF_INIT;
1175 int ret = 0; /* assume changed for safety */
1176 if (sha_eq(o_sha, a_sha))
1178 return 1;
1179 if (!renormalize)
1180 return 0;
1181 assert(o_sha && a_sha);
1183 if (read_sha1_strbuf(o_sha, &o) || read_sha1_strbuf(a_sha, &a))
1184 goto error_return;
1185 /*
1186 * Note: binary | is used so that both renormalizations are
1187 * performed. Comparison can be skipped if both files are
1188 * unchanged since their sha1s have already been compared.
1189 */
1190 if (renormalize_buffer(path, o.buf, o.len, &o) |
1191 renormalize_buffer(path, a.buf, o.len, &a))
1192 ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len));
1193error_return:
1195 strbuf_release(&o);
1196 strbuf_release(&a);
1197 return ret;
1198}
1199static void handle_delete_modify(struct merge_options *o,
1201 const char *path,
1202 const char *new_path,
1203 unsigned char *a_sha, int a_mode,
1204 unsigned char *b_sha, int b_mode)
1205{
1206 if (!a_sha) {
1207 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1208 "and modified in %s. Version %s of %s left in tree%s%s.",
1209 path, o->branch1,
1210 o->branch2, o->branch2, path,
1211 path == new_path ? "" : " at ",
1212 path == new_path ? "" : new_path);
1213 update_file(o, 0, b_sha, b_mode, new_path);
1214 } else {
1215 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1216 "and modified in %s. Version %s of %s left in tree%s%s.",
1217 path, o->branch2,
1218 o->branch1, o->branch1, path,
1219 path == new_path ? "" : " at ",
1220 path == new_path ? "" : new_path);
1221 update_file(o, 0, a_sha, a_mode, new_path);
1222 }
1223}
1224static int merge_content(struct merge_options *o,
1226 const char *path,
1227 unsigned char *o_sha, int o_mode,
1228 unsigned char *a_sha, int a_mode,
1229 unsigned char *b_sha, int b_mode,
1230 const char *df_rename_conflict_branch)
1231{
1232 const char *reason = "content";
1233 struct merge_file_info mfi;
1234 struct diff_filespec one, a, b;
1235 struct stat st;
1236 unsigned df_conflict_remains = 0;
1237 if (!o_sha) {
1239 reason = "add/add";
1240 o_sha = (unsigned char *)null_sha1;
1241 }
1242 one.path = a.path = b.path = (char *)path;
1243 hashcpy(one.sha1, o_sha);
1244 one.mode = o_mode;
1245 hashcpy(a.sha1, a_sha);
1246 a.mode = a_mode;
1247 hashcpy(b.sha1, b_sha);
1248 b.mode = b_mode;
1249 mfi = merge_file(o, &one, &a, &b, o->branch1, o->branch2);
1251 if (df_rename_conflict_branch &&
1252 lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1253 df_conflict_remains = 1;
1254 }
1255 if (mfi.clean && !df_conflict_remains &&
1257 sha_eq(mfi.sha, a_sha) && mfi.mode == a.mode)
1258 output(o, 3, "Skipped %s (merged same as existing)", path);
1259 else
1260 output(o, 2, "Auto-merging %s", path);
1261 if (!mfi.clean) {
1263 if (S_ISGITLINK(mfi.mode))
1264 reason = "submodule";
1265 output(o, 1, "CONFLICT (%s): Merge conflict in %s",
1266 reason, path);
1267 }
1268 if (df_conflict_remains) {
1270 char *new_path;
1271 update_file_flags(o, mfi.sha, mfi.mode, path,
1272 o->call_depth || mfi.clean, 0);
1273 new_path = unique_path(o, path, df_rename_conflict_branch);
1274 mfi.clean = 0;
1275 output(o, 1, "Adding as %s instead", new_path);
1276 update_file_flags(o, mfi.sha, mfi.mode, new_path, 0, 1);
1277 free(new_path);
1278 } else {
1279 update_file(o, mfi.clean, mfi.sha, mfi.mode, path);
1280 }
1281 return mfi.clean;
1282}
1284/* Per entry merge function */
1286static int process_entry(struct merge_options *o,
1287 const char *path, struct stage_data *entry)
1288{
1289 /*
1290 printf("processing entry, clean cache: %s\n", index_only ? "yes": "no");
1291 print_index_entry("\tpath: ", entry);
1292 */
1293 int clean_merge = 1;
1294 int normalize = o->renormalize;
1295 unsigned o_mode = entry->stages[1].mode;
1296 unsigned a_mode = entry->stages[2].mode;
1297 unsigned b_mode = entry->stages[3].mode;
1298 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1299 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1300 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1301 if (entry->rename_df_conflict_info)
1303 return 1; /* Such cases are handled elsewhere. */
1304 entry->processed = 1;
1306 if (o_sha && (!a_sha || !b_sha)) {
1307 /* Case A: Deleted in one */
1308 if ((!a_sha && !b_sha) ||
1309 (!b_sha && blob_unchanged(o_sha, a_sha, normalize, path)) ||
1310 (!a_sha && blob_unchanged(o_sha, b_sha, normalize, path))) {
1311 /* Deleted in both or deleted in one and
1312 * unchanged in the other */
1313 if (a_sha)
1314 output(o, 2, "Removing %s", path);
1315 /* do not touch working file if it did not exist */
1316 remove_file(o, 1, path, !a_sha);
1317 } else if (string_list_has_string(&o->current_directory_set,
1318 path)) {
1319 entry->processed = 0;
1320 return 1; /* Assume clean until processed */
1321 } else {
1322 /* Deleted in one and changed in the other */
1323 clean_merge = 0;
1324 handle_delete_modify(o, path, path,
1325 a_sha, a_mode, b_sha, b_mode);
1326 }
1327 } else if ((!o_sha && a_sha && !b_sha) ||
1329 (!o_sha && !a_sha && b_sha)) {
1330 /* Case B: Added in one. */
1331 unsigned mode;
1332 const unsigned char *sha;
1333 if (a_sha) {
1335 mode = a_mode;
1336 sha = a_sha;
1337 } else {
1338 mode = b_mode;
1339 sha = b_sha;
1340 }
1341 if (string_list_has_string(&o->current_directory_set, path)) {
1342 /* Handle D->F conflicts after all subfiles */
1343 entry->processed = 0;
1344 return 1; /* Assume clean until processed */
1345 } else {
1346 output(o, 2, "Adding %s", path);
1347 update_file(o, 1, sha, mode, path);
1348 }
1349 } else if (a_sha && b_sha) {
1350 /* Case C: Added in both (check for same permissions) and */
1351 /* case D: Modified in both, but differently. */
1352 clean_merge = merge_content(o, path,
1353 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1354 NULL);
1355 } else if (!o_sha && !a_sha && !b_sha) {
1356 /*
1357 * this entry was deleted altogether. a_mode == 0 means
1358 * we had that path and want to actively remove it.
1359 */
1360 remove_file(o, 1, path, !a_mode);
1361 } else
1362 die("Fatal merge failure, shouldn't happen.");
1363 return clean_merge;
1365}
1366/*
1368 * Per entry merge function for D/F (and/or rename) conflicts. In the
1369 * cases we can cleanly resolve D/F conflicts, process_entry() can
1370 * clean out all the files below the directory for us. All D/F
1371 * conflict cases must be handled here at the end to make sure any
1372 * directories that can be cleaned out, are.
1373 *
1374 * Some rename conflicts may also be handled here that don't necessarily
1375 * involve D/F conflicts, since the code to handle them is generic enough
1376 * to handle those rename conflicts with or without D/F conflicts also
1377 * being involved.
1378 */
1379static int process_df_entry(struct merge_options *o,
1380 const char *path, struct stage_data *entry)
1381{
1382 int clean_merge = 1;
1383 unsigned o_mode = entry->stages[1].mode;
1384 unsigned a_mode = entry->stages[2].mode;
1385 unsigned b_mode = entry->stages[3].mode;
1386 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1387 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1388 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1389 struct stat st;
1390 entry->processed = 1;
1392 if (entry->rename_df_conflict_info) {
1393 struct rename_df_conflict_info *conflict_info = entry->rename_df_conflict_info;
1394 char *src;
1395 switch (conflict_info->rename_type) {
1396 case RENAME_NORMAL:
1397 clean_merge = merge_content(o, path,
1398 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1399 conflict_info->branch1);
1400 break;
1401 case RENAME_DELETE:
1402 clean_merge = 0;
1403 conflict_rename_delete(o, conflict_info->pair1,
1404 conflict_info->branch1,
1405 conflict_info->branch2);
1406 break;
1407 case RENAME_ONE_FILE_TO_TWO:
1408 src = conflict_info->pair1->one->path;
1409 clean_merge = 0;
1410 output(o, 1, "CONFLICT (rename/rename): "
1411 "Rename \"%s\"->\"%s\" in branch \"%s\" "
1412 "rename \"%s\"->\"%s\" in \"%s\"%s",
1413 src, conflict_info->pair1->two->path, conflict_info->branch1,
1414 src, conflict_info->pair2->two->path, conflict_info->branch2,
1415 o->call_depth ? " (left unresolved)" : "");
1416 if (o->call_depth) {
1417 remove_file_from_cache(src);
1418 update_file(o, 0, conflict_info->pair1->one->sha1,
1419 conflict_info->pair1->one->mode, src);
1420 }
1421 conflict_rename_rename_1to2(o, conflict_info->pair1,
1422 conflict_info->branch1,
1423 conflict_info->pair2,
1424 conflict_info->branch2);
1425 conflict_info->dst_entry2->processed = 1;
1426 break;
1427 default:
1428 entry->processed = 0;
1429 break;
1430 }
1431 } else if (o_sha && (!a_sha || !b_sha)) {
1432 /* Modify/delete; deleted side may have put a directory in the way */
1433 char *renamed = NULL;
1434 if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1435 renamed = unique_path(o, path, a_sha ? o->branch1 : o->branch2);
1436 }
1437 clean_merge = 0;
1438 handle_delete_modify(o, path, renamed ? renamed : path,
1439 a_sha, a_mode, b_sha, b_mode);
1440 free(renamed);
1441 } else if (!o_sha && !!a_sha != !!b_sha) {
1442 /* directory -> (directory, file) or <nothing> -> (directory, file) */
1443 const char *add_branch;
1444 const char *other_branch;
1445 unsigned mode;
1446 const unsigned char *sha;
1447 const char *conf;
1448 if (a_sha) {
1450 add_branch = o->branch1;
1451 other_branch = o->branch2;
1452 mode = a_mode;
1453 sha = a_sha;
1454 conf = "file/directory";
1455 } else {
1456 add_branch = o->branch2;
1457 other_branch = o->branch1;
1458 mode = b_mode;
1459 sha = b_sha;
1460 conf = "directory/file";
1461 }
1462 if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1463 char *new_path = unique_path(o, path, add_branch);
1464 clean_merge = 0;
1465 output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. "
1466 "Adding %s as %s",
1467 conf, path, other_branch, path, new_path);
1468 update_file(o, 0, sha, mode, new_path);
1469 if (o->call_depth)
1470 remove_file_from_cache(path);
1471 free(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 return clean_merge;
1482}
1483int 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 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 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 code = git_merge_trees(o->call_depth, common, head, merge);
1504 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 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 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 string_list_clear(re_merge, 0);
1549 string_list_clear(re_head, 0);
1550 string_list_clear(entries, 1);
1551 }
1553 else
1554 clean = 1;
1555 if (o->call_depth)
1557 *result = write_tree_from_memory(o);
1558 return clean;
1560}
1561static 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/*
1574 * Merge the commits h1 and h2, return the resulting virtual
1575 * commit object and a flag indicating the cleanness of the merge.
1576 */
1577int 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 if (show(o, 4)) {
1589 output(o, 4, "Merging:");
1590 output_commit_title(o, h1);
1591 output_commit_title(o, h2);
1592 }
1593 if (!ca) {
1595 ca = get_merge_bases(h1, h2, 1);
1596 ca = reverse_commit_list(ca);
1597 }
1598 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 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 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 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 if (!merged_common_ancestors)
1638 die("merge returned no commit");
1639 }
1640 discard_cache();
1642 if (!o->call_depth)
1643 read_cache();
1644 o->ancestor = "merged common ancestors";
1646 clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
1647 &mrtree);
1648 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 (show(o, 2))
1656 diff_warn_rename_limit("merge.renamelimit",
1657 o->needed_rename_limit, 0);
1658 return clean;
1659}
1660static struct commit *get_ref(const unsigned char *sha1, const char *name)
1662{
1663 struct object *object;
1664 object = deref_tag(parse_object(sha1), name, strlen(name));
1666 if (!object)
1667 return NULL;
1668 if (object->type == OBJ_TREE)
1669 return make_virtual_commit((struct tree*)object, name);
1670 if (object->type != OBJ_COMMIT)
1671 return NULL;
1672 if (parse_commit((struct commit *)object))
1673 return NULL;
1674 return (struct commit *)object;
1675}
1676int merge_recursive_generic(struct merge_options *o,
1678 const unsigned char *head,
1679 const unsigned char *merge,
1680 int num_base_list,
1681 const unsigned char **base_list,
1682 struct commit **result)
1683{
1684 int clean, index_fd;
1685 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
1686 struct commit *head_commit = get_ref(head, o->branch1);
1687 struct commit *next_commit = get_ref(merge, o->branch2);
1688 struct commit_list *ca = NULL;
1689 if (base_list) {
1691 int i;
1692 for (i = 0; i < num_base_list; ++i) {
1693 struct commit *base;
1694 if (!(base = get_ref(base_list[i], sha1_to_hex(base_list[i]))))
1695 return error("Could not parse object '%s'",
1696 sha1_to_hex(base_list[i]));
1697 commit_list_insert(base, &ca);
1698 }
1699 }
1700 index_fd = hold_locked_index(lock, 1);
1702 clean = merge_recursive(o, head_commit, next_commit, ca,
1703 result);
1704 if (active_cache_changed &&
1705 (write_cache(index_fd, active_cache, active_nr) ||
1706 commit_locked_index(lock)))
1707 return error("Unable to write index.");
1708 return clean ? 0 : 1;
1710}
1711static int merge_recursive_config(const char *var, const char *value, void *cb)
1713{
1714 struct merge_options *o = cb;
1715 if (!strcmp(var, "merge.verbosity")) {
1716 o->verbosity = git_config_int(var, value);
1717 return 0;
1718 }
1719 if (!strcmp(var, "diff.renamelimit")) {
1720 o->diff_rename_limit = git_config_int(var, value);
1721 return 0;
1722 }
1723 if (!strcmp(var, "merge.renamelimit")) {
1724 o->merge_rename_limit = git_config_int(var, value);
1725 return 0;
1726 }
1727 return git_xmerge_config(var, value, cb);
1728}
1729void init_merge_options(struct merge_options *o)
1731{
1732 memset(o, 0, sizeof(struct merge_options));
1733 o->verbosity = 2;
1734 o->buffer_output = 1;
1735 o->diff_rename_limit = -1;
1736 o->merge_rename_limit = -1;
1737 o->renormalize = 0;
1738 git_config(merge_recursive_config, o);
1739 if (getenv("GIT_MERGE_VERBOSITY"))
1740 o->verbosity =
1741 strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10);
1742 if (o->verbosity >= 5)
1743 o->buffer_output = 0;
1744 strbuf_init(&o->obuf, 0);
1745 memset(&o->current_file_set, 0, sizeof(struct string_list));
1746 o->current_file_set.strdup_strings = 1;
1747 memset(&o->current_directory_set, 0, sizeof(struct string_list));
1748 o->current_directory_set.strdup_strings = 1;
1749}
1750int parse_merge_opt(struct merge_options *o, const char *s)
1752{
1753 if (!s || !*s)
1754 return -1;
1755 if (!strcmp(s, "ours"))
1756 o->recursive_variant = MERGE_RECURSIVE_OURS;
1757 else if (!strcmp(s, "theirs"))
1758 o->recursive_variant = MERGE_RECURSIVE_THEIRS;
1759 else if (!strcmp(s, "subtree"))
1760 o->subtree_shift = "";
1761 else if (!prefixcmp(s, "subtree="))
1762 o->subtree_shift = s + strlen("subtree=");
1763 else if (!strcmp(s, "patience"))
1764 o->xdl_opts |= XDF_PATIENCE_DIFF;
1765 else if (!strcmp(s, "ignore-space-change"))
1766 o->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
1767 else if (!strcmp(s, "ignore-all-space"))
1768 o->xdl_opts |= XDF_IGNORE_WHITESPACE;
1769 else if (!strcmp(s, "ignore-space-at-eol"))
1770 o->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
1771 else if (!strcmp(s, "renormalize"))
1772 o->renormalize = 1;
1773 else if (!strcmp(s, "no-renormalize"))
1774 o->renormalize = 0;
1775 else if (!prefixcmp(s, "rename-threshold=")) {
1776 const char *score = s + strlen("rename-threshold=");
1777 if ((o->rename_score = parse_rename_score(&score)) == -1 || *score != 0)
1778 return -1;
1779 }
1780 else
1781 return -1;
1782 return 0;
1783}