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1 /*
2 * Recursive Merge algorithm stolen from git-merge-recursive.py by
3 * Fredrik Kuivinen.
4 * The thieves were Alex Riesen and Johannes Schindelin, in June/July 2006
5 */
6 #include "advice.h"
7 #include "cache.h"
8 #include "cache-tree.h"
9 #include "commit.h"
10 #include "blob.h"
11 #include "builtin.h"
12 #include "tree-walk.h"
13 #include "diff.h"
14 #include "diffcore.h"
15 #include "tag.h"
16 #include "unpack-trees.h"
17 #include "string-list.h"
18 #include "xdiff-interface.h"
19 #include "ll-merge.h"
20 #include "attr.h"
21 #include "merge-recursive.h"
22 #include "dir.h"
24 static struct tree *shift_tree_object(struct tree *one, struct tree *two,
25 const char *subtree_shift)
26 {
27 unsigned char shifted[20];
29 if (!*subtree_shift) {
30 shift_tree(one->object.sha1, two->object.sha1, shifted, 0);
31 } else {
32 shift_tree_by(one->object.sha1, two->object.sha1, shifted,
33 subtree_shift);
34 }
35 if (!hashcmp(two->object.sha1, shifted))
36 return two;
37 return lookup_tree(shifted);
38 }
40 /*
41 * A virtual commit has (const char *)commit->util set to the name.
42 */
44 static struct commit *make_virtual_commit(struct tree *tree, const char *comment)
45 {
46 struct commit *commit = xcalloc(1, sizeof(struct commit));
47 commit->tree = tree;
48 commit->util = (void*)comment;
49 /* avoid warnings */
50 commit->object.parsed = 1;
51 return commit;
52 }
54 /*
55 * Since we use get_tree_entry(), which does not put the read object into
56 * the object pool, we cannot rely on a == b.
57 */
58 static int sha_eq(const unsigned char *a, const unsigned char *b)
59 {
60 if (!a && !b)
61 return 2;
62 return a && b && hashcmp(a, b) == 0;
63 }
65 /*
66 * Since we want to write the index eventually, we cannot reuse the index
67 * for these (temporary) data.
68 */
69 struct stage_data
70 {
71 struct
72 {
73 unsigned mode;
74 unsigned char sha[20];
75 } stages[4];
76 unsigned processed:1;
77 };
79 static int show(struct merge_options *o, int v)
80 {
81 return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5;
82 }
84 static void flush_output(struct merge_options *o)
85 {
86 if (o->obuf.len) {
87 fputs(o->obuf.buf, stdout);
88 strbuf_reset(&o->obuf);
89 }
90 }
92 __attribute__((format (printf, 3, 4)))
93 static void output(struct merge_options *o, int v, const char *fmt, ...)
94 {
95 int len;
96 va_list ap;
98 if (!show(o, v))
99 return;
101 strbuf_grow(&o->obuf, o->call_depth * 2 + 2);
102 memset(o->obuf.buf + o->obuf.len, ' ', o->call_depth * 2);
103 strbuf_setlen(&o->obuf, o->obuf.len + o->call_depth * 2);
105 va_start(ap, fmt);
106 len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap);
107 va_end(ap);
109 if (len < 0)
110 len = 0;
111 if (len >= strbuf_avail(&o->obuf)) {
112 strbuf_grow(&o->obuf, len + 2);
113 va_start(ap, fmt);
114 len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap);
115 va_end(ap);
116 if (len >= strbuf_avail(&o->obuf)) {
117 die("this should not happen, your snprintf is broken");
118 }
119 }
120 strbuf_setlen(&o->obuf, o->obuf.len + len);
121 strbuf_add(&o->obuf, "\n", 1);
122 if (!o->buffer_output)
123 flush_output(o);
124 }
126 static void output_commit_title(struct merge_options *o, struct commit *commit)
127 {
128 int i;
129 flush_output(o);
130 for (i = o->call_depth; i--;)
131 fputs(" ", stdout);
132 if (commit->util)
133 printf("virtual %s\n", (char *)commit->util);
134 else {
135 printf("%s ", find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV));
136 if (parse_commit(commit) != 0)
137 printf("(bad commit)\n");
138 else {
139 const char *s;
140 int len;
141 for (s = commit->buffer; *s; s++)
142 if (*s == '\n' && s[1] == '\n') {
143 s += 2;
144 break;
145 }
146 for (len = 0; s[len] && '\n' != s[len]; len++)
147 ; /* do nothing */
148 printf("%.*s\n", len, s);
149 }
150 }
151 }
153 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
154 const char *path, int stage, int refresh, int options)
155 {
156 struct cache_entry *ce;
157 ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage, refresh);
158 if (!ce)
159 return error("addinfo_cache failed for path '%s'", path);
160 return add_cache_entry(ce, options);
161 }
163 static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree)
164 {
165 parse_tree(tree);
166 init_tree_desc(desc, tree->buffer, tree->size);
167 }
169 static int git_merge_trees(int index_only,
170 struct tree *common,
171 struct tree *head,
172 struct tree *merge)
173 {
174 int rc;
175 struct tree_desc t[3];
176 struct unpack_trees_options opts;
178 memset(&opts, 0, sizeof(opts));
179 if (index_only)
180 opts.index_only = 1;
181 else
182 opts.update = 1;
183 opts.merge = 1;
184 opts.head_idx = 2;
185 opts.fn = threeway_merge;
186 opts.src_index = &the_index;
187 opts.dst_index = &the_index;
188 opts.msgs = get_porcelain_error_msgs();
190 init_tree_desc_from_tree(t+0, common);
191 init_tree_desc_from_tree(t+1, head);
192 init_tree_desc_from_tree(t+2, merge);
194 rc = unpack_trees(3, t, &opts);
195 cache_tree_free(&active_cache_tree);
196 return rc;
197 }
199 struct tree *write_tree_from_memory(struct merge_options *o)
200 {
201 struct tree *result = NULL;
203 if (unmerged_cache()) {
204 int i;
205 fprintf(stderr, "BUG: There are unmerged index entries:\n");
206 for (i = 0; i < active_nr; i++) {
207 struct cache_entry *ce = active_cache[i];
208 if (ce_stage(ce))
209 fprintf(stderr, "BUG: %d %.*s", ce_stage(ce),
210 (int)ce_namelen(ce), ce->name);
211 }
212 die("Bug in merge-recursive.c");
213 }
215 if (!active_cache_tree)
216 active_cache_tree = cache_tree();
218 if (!cache_tree_fully_valid(active_cache_tree) &&
219 cache_tree_update(active_cache_tree,
220 active_cache, active_nr, 0, 0) < 0)
221 die("error building trees");
223 result = lookup_tree(active_cache_tree->sha1);
225 return result;
226 }
228 static int save_files_dirs(const unsigned char *sha1,
229 const char *base, int baselen, const char *path,
230 unsigned int mode, int stage, void *context)
231 {
232 int len = strlen(path);
233 char *newpath = xmalloc(baselen + len + 1);
234 struct merge_options *o = context;
236 memcpy(newpath, base, baselen);
237 memcpy(newpath + baselen, path, len);
238 newpath[baselen + len] = '\0';
240 if (S_ISDIR(mode))
241 string_list_insert(newpath, &o->current_directory_set);
242 else
243 string_list_insert(newpath, &o->current_file_set);
244 free(newpath);
246 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
247 }
249 static int get_files_dirs(struct merge_options *o, struct tree *tree)
250 {
251 int n;
252 if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs, o))
253 return 0;
254 n = o->current_file_set.nr + o->current_directory_set.nr;
255 return n;
256 }
258 /*
259 * Returns an index_entry instance which doesn't have to correspond to
260 * a real cache entry in Git's index.
261 */
262 static struct stage_data *insert_stage_data(const char *path,
263 struct tree *o, struct tree *a, struct tree *b,
264 struct string_list *entries)
265 {
266 struct string_list_item *item;
267 struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
268 get_tree_entry(o->object.sha1, path,
269 e->stages[1].sha, &e->stages[1].mode);
270 get_tree_entry(a->object.sha1, path,
271 e->stages[2].sha, &e->stages[2].mode);
272 get_tree_entry(b->object.sha1, path,
273 e->stages[3].sha, &e->stages[3].mode);
274 item = string_list_insert(path, entries);
275 item->util = e;
276 return e;
277 }
279 /*
280 * Create a dictionary mapping file names to stage_data objects. The
281 * dictionary contains one entry for every path with a non-zero stage entry.
282 */
283 static struct string_list *get_unmerged(void)
284 {
285 struct string_list *unmerged = xcalloc(1, sizeof(struct string_list));
286 int i;
288 unmerged->strdup_strings = 1;
290 for (i = 0; i < active_nr; i++) {
291 struct string_list_item *item;
292 struct stage_data *e;
293 struct cache_entry *ce = active_cache[i];
294 if (!ce_stage(ce))
295 continue;
297 item = string_list_lookup(ce->name, unmerged);
298 if (!item) {
299 item = string_list_insert(ce->name, unmerged);
300 item->util = xcalloc(1, sizeof(struct stage_data));
301 }
302 e = item->util;
303 e->stages[ce_stage(ce)].mode = ce->ce_mode;
304 hashcpy(e->stages[ce_stage(ce)].sha, ce->sha1);
305 }
307 return unmerged;
308 }
310 struct rename
311 {
312 struct diff_filepair *pair;
313 struct stage_data *src_entry;
314 struct stage_data *dst_entry;
315 unsigned processed:1;
316 };
318 /*
319 * Get information of all renames which occurred between 'o_tree' and
320 * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
321 * 'b_tree') to be able to associate the correct cache entries with
322 * the rename information. 'tree' is always equal to either a_tree or b_tree.
323 */
324 static struct string_list *get_renames(struct merge_options *o,
325 struct tree *tree,
326 struct tree *o_tree,
327 struct tree *a_tree,
328 struct tree *b_tree,
329 struct string_list *entries)
330 {
331 int i;
332 struct string_list *renames;
333 struct diff_options opts;
335 renames = xcalloc(1, sizeof(struct string_list));
336 diff_setup(&opts);
337 DIFF_OPT_SET(&opts, RECURSIVE);
338 opts.detect_rename = DIFF_DETECT_RENAME;
339 opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
340 o->diff_rename_limit >= 0 ? o->diff_rename_limit :
341 500;
342 opts.warn_on_too_large_rename = 1;
343 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
344 if (diff_setup_done(&opts) < 0)
345 die("diff setup failed");
346 diff_tree_sha1(o_tree->object.sha1, tree->object.sha1, "", &opts);
347 diffcore_std(&opts);
348 for (i = 0; i < diff_queued_diff.nr; ++i) {
349 struct string_list_item *item;
350 struct rename *re;
351 struct diff_filepair *pair = diff_queued_diff.queue[i];
352 if (pair->status != 'R') {
353 diff_free_filepair(pair);
354 continue;
355 }
356 re = xmalloc(sizeof(*re));
357 re->processed = 0;
358 re->pair = pair;
359 item = string_list_lookup(re->pair->one->path, entries);
360 if (!item)
361 re->src_entry = insert_stage_data(re->pair->one->path,
362 o_tree, a_tree, b_tree, entries);
363 else
364 re->src_entry = item->util;
366 item = string_list_lookup(re->pair->two->path, entries);
367 if (!item)
368 re->dst_entry = insert_stage_data(re->pair->two->path,
369 o_tree, a_tree, b_tree, entries);
370 else
371 re->dst_entry = item->util;
372 item = string_list_insert(pair->one->path, renames);
373 item->util = re;
374 }
375 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
376 diff_queued_diff.nr = 0;
377 diff_flush(&opts);
378 return renames;
379 }
381 static int update_stages(const char *path, struct diff_filespec *o,
382 struct diff_filespec *a, struct diff_filespec *b,
383 int clear)
384 {
385 int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE;
386 if (clear)
387 if (remove_file_from_cache(path))
388 return -1;
389 if (o)
390 if (add_cacheinfo(o->mode, o->sha1, path, 1, 0, options))
391 return -1;
392 if (a)
393 if (add_cacheinfo(a->mode, a->sha1, path, 2, 0, options))
394 return -1;
395 if (b)
396 if (add_cacheinfo(b->mode, b->sha1, path, 3, 0, options))
397 return -1;
398 return 0;
399 }
401 static int remove_file(struct merge_options *o, int clean,
402 const char *path, int no_wd)
403 {
404 int update_cache = o->call_depth || clean;
405 int update_working_directory = !o->call_depth && !no_wd;
407 if (update_cache) {
408 if (remove_file_from_cache(path))
409 return -1;
410 }
411 if (update_working_directory) {
412 if (remove_path(path) && errno != ENOENT)
413 return -1;
414 }
415 return 0;
416 }
418 static char *unique_path(struct merge_options *o, const char *path, const char *branch)
419 {
420 char *newpath = xmalloc(strlen(path) + 1 + strlen(branch) + 8 + 1);
421 int suffix = 0;
422 struct stat st;
423 char *p = newpath + strlen(path);
424 strcpy(newpath, path);
425 *(p++) = '~';
426 strcpy(p, branch);
427 for (; *p; ++p)
428 if ('/' == *p)
429 *p = '_';
430 while (string_list_has_string(&o->current_file_set, newpath) ||
431 string_list_has_string(&o->current_directory_set, newpath) ||
432 lstat(newpath, &st) == 0)
433 sprintf(p, "_%d", suffix++);
435 string_list_insert(newpath, &o->current_file_set);
436 return newpath;
437 }
439 static void flush_buffer(int fd, const char *buf, unsigned long size)
440 {
441 while (size > 0) {
442 long ret = write_in_full(fd, buf, size);
443 if (ret < 0) {
444 /* Ignore epipe */
445 if (errno == EPIPE)
446 break;
447 die_errno("merge-recursive");
448 } else if (!ret) {
449 die("merge-recursive: disk full?");
450 }
451 size -= ret;
452 buf += ret;
453 }
454 }
456 static int would_lose_untracked(const char *path)
457 {
458 int pos = cache_name_pos(path, strlen(path));
460 if (pos < 0)
461 pos = -1 - pos;
462 while (pos < active_nr &&
463 !strcmp(path, active_cache[pos]->name)) {
464 /*
465 * If stage #0, it is definitely tracked.
466 * If it has stage #2 then it was tracked
467 * before this merge started. All other
468 * cases the path was not tracked.
469 */
470 switch (ce_stage(active_cache[pos])) {
471 case 0:
472 case 2:
473 return 0;
474 }
475 pos++;
476 }
477 return file_exists(path);
478 }
480 static int make_room_for_path(const char *path)
481 {
482 int status;
483 const char *msg = "failed to create path '%s'%s";
485 status = safe_create_leading_directories_const(path);
486 if (status) {
487 if (status == -3) {
488 /* something else exists */
489 error(msg, path, ": perhaps a D/F conflict?");
490 return -1;
491 }
492 die(msg, path, "");
493 }
495 /*
496 * Do not unlink a file in the work tree if we are not
497 * tracking it.
498 */
499 if (would_lose_untracked(path))
500 return error("refusing to lose untracked file at '%s'",
501 path);
503 /* Successful unlink is good.. */
504 if (!unlink(path))
505 return 0;
506 /* .. and so is no existing file */
507 if (errno == ENOENT)
508 return 0;
509 /* .. but not some other error (who really cares what?) */
510 return error(msg, path, ": perhaps a D/F conflict?");
511 }
513 static void update_file_flags(struct merge_options *o,
514 const unsigned char *sha,
515 unsigned mode,
516 const char *path,
517 int update_cache,
518 int update_wd)
519 {
520 if (o->call_depth)
521 update_wd = 0;
523 if (update_wd) {
524 enum object_type type;
525 void *buf;
526 unsigned long size;
528 if (S_ISGITLINK(mode))
529 /*
530 * We may later decide to recursively descend into
531 * the submodule directory and update its index
532 * and/or work tree, but we do not do that now.
533 */
534 goto update_index;
536 buf = read_sha1_file(sha, &type, &size);
537 if (!buf)
538 die("cannot read object %s '%s'", sha1_to_hex(sha), path);
539 if (type != OBJ_BLOB)
540 die("blob expected for %s '%s'", sha1_to_hex(sha), path);
541 if (S_ISREG(mode)) {
542 struct strbuf strbuf = STRBUF_INIT;
543 if (convert_to_working_tree(path, buf, size, &strbuf)) {
544 free(buf);
545 size = strbuf.len;
546 buf = strbuf_detach(&strbuf, NULL);
547 }
548 }
550 if (make_room_for_path(path) < 0) {
551 update_wd = 0;
552 free(buf);
553 goto update_index;
554 }
555 if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
556 int fd;
557 if (mode & 0100)
558 mode = 0777;
559 else
560 mode = 0666;
561 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
562 if (fd < 0)
563 die_errno("failed to open '%s'", path);
564 flush_buffer(fd, buf, size);
565 close(fd);
566 } else if (S_ISLNK(mode)) {
567 char *lnk = xmemdupz(buf, size);
568 safe_create_leading_directories_const(path);
569 unlink(path);
570 if (symlink(lnk, path))
571 die_errno("failed to symlink '%s'", path);
572 free(lnk);
573 } else
574 die("do not know what to do with %06o %s '%s'",
575 mode, sha1_to_hex(sha), path);
576 free(buf);
577 }
578 update_index:
579 if (update_cache)
580 add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
581 }
583 static void update_file(struct merge_options *o,
584 int clean,
585 const unsigned char *sha,
586 unsigned mode,
587 const char *path)
588 {
589 update_file_flags(o, sha, mode, path, o->call_depth || clean, !o->call_depth);
590 }
592 /* Low level file merging, update and removal */
594 struct merge_file_info
595 {
596 unsigned char sha[20];
597 unsigned mode;
598 unsigned clean:1,
599 merge:1;
600 };
602 static int merge_3way(struct merge_options *o,
603 mmbuffer_t *result_buf,
604 struct diff_filespec *one,
605 struct diff_filespec *a,
606 struct diff_filespec *b,
607 const char *branch1,
608 const char *branch2)
609 {
610 mmfile_t orig, src1, src2;
611 char *name1, *name2;
612 int merge_status;
613 int favor;
615 if (o->call_depth)
616 favor = 0;
617 else {
618 switch (o->recursive_variant) {
619 case MERGE_RECURSIVE_OURS:
620 favor = XDL_MERGE_FAVOR_OURS;
621 break;
622 case MERGE_RECURSIVE_THEIRS:
623 favor = XDL_MERGE_FAVOR_THEIRS;
624 break;
625 default:
626 favor = 0;
627 break;
628 }
629 }
631 if (strcmp(a->path, b->path)) {
632 name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
633 name2 = xstrdup(mkpath("%s:%s", branch2, b->path));
634 } else {
635 name1 = xstrdup(mkpath("%s", branch1));
636 name2 = xstrdup(mkpath("%s", branch2));
637 }
639 read_mmblob(&orig, one->sha1);
640 read_mmblob(&src1, a->sha1);
641 read_mmblob(&src2, b->sha1);
643 merge_status = ll_merge(result_buf, a->path, &orig,
644 &src1, name1, &src2, name2,
645 (!!o->call_depth) | (favor << 1));
647 free(name1);
648 free(name2);
649 free(orig.ptr);
650 free(src1.ptr);
651 free(src2.ptr);
652 return merge_status;
653 }
655 static struct merge_file_info merge_file(struct merge_options *o,
656 struct diff_filespec *one,
657 struct diff_filespec *a,
658 struct diff_filespec *b,
659 const char *branch1,
660 const char *branch2)
661 {
662 struct merge_file_info result;
663 result.merge = 0;
664 result.clean = 1;
666 if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) {
667 result.clean = 0;
668 if (S_ISREG(a->mode)) {
669 result.mode = a->mode;
670 hashcpy(result.sha, a->sha1);
671 } else {
672 result.mode = b->mode;
673 hashcpy(result.sha, b->sha1);
674 }
675 } else {
676 if (!sha_eq(a->sha1, one->sha1) && !sha_eq(b->sha1, one->sha1))
677 result.merge = 1;
679 /*
680 * Merge modes
681 */
682 if (a->mode == b->mode || a->mode == one->mode)
683 result.mode = b->mode;
684 else {
685 result.mode = a->mode;
686 if (b->mode != one->mode) {
687 result.clean = 0;
688 result.merge = 1;
689 }
690 }
692 if (sha_eq(a->sha1, b->sha1) || sha_eq(a->sha1, one->sha1))
693 hashcpy(result.sha, b->sha1);
694 else if (sha_eq(b->sha1, one->sha1))
695 hashcpy(result.sha, a->sha1);
696 else if (S_ISREG(a->mode)) {
697 mmbuffer_t result_buf;
698 int merge_status;
700 merge_status = merge_3way(o, &result_buf, one, a, b,
701 branch1, branch2);
703 if ((merge_status < 0) || !result_buf.ptr)
704 die("Failed to execute internal merge");
706 if (write_sha1_file(result_buf.ptr, result_buf.size,
707 blob_type, result.sha))
708 die("Unable to add %s to database",
709 a->path);
711 free(result_buf.ptr);
712 result.clean = (merge_status == 0);
713 } else if (S_ISGITLINK(a->mode)) {
714 result.clean = 0;
715 hashcpy(result.sha, a->sha1);
716 } else if (S_ISLNK(a->mode)) {
717 hashcpy(result.sha, a->sha1);
719 if (!sha_eq(a->sha1, b->sha1))
720 result.clean = 0;
721 } else {
722 die("unsupported object type in the tree");
723 }
724 }
726 return result;
727 }
729 static void conflict_rename_rename(struct merge_options *o,
730 struct rename *ren1,
731 const char *branch1,
732 struct rename *ren2,
733 const char *branch2)
734 {
735 char *del[2];
736 int delp = 0;
737 const char *ren1_dst = ren1->pair->two->path;
738 const char *ren2_dst = ren2->pair->two->path;
739 const char *dst_name1 = ren1_dst;
740 const char *dst_name2 = ren2_dst;
741 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
742 dst_name1 = del[delp++] = unique_path(o, ren1_dst, branch1);
743 output(o, 1, "%s is a directory in %s adding as %s instead",
744 ren1_dst, branch2, dst_name1);
745 remove_file(o, 0, ren1_dst, 0);
746 }
747 if (string_list_has_string(&o->current_directory_set, ren2_dst)) {
748 dst_name2 = del[delp++] = unique_path(o, ren2_dst, branch2);
749 output(o, 1, "%s is a directory in %s adding as %s instead",
750 ren2_dst, branch1, dst_name2);
751 remove_file(o, 0, ren2_dst, 0);
752 }
753 if (o->call_depth) {
754 remove_file_from_cache(dst_name1);
755 remove_file_from_cache(dst_name2);
756 /*
757 * Uncomment to leave the conflicting names in the resulting tree
758 *
759 * update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, dst_name1);
760 * update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, dst_name2);
761 */
762 } else {
763 update_stages(dst_name1, NULL, ren1->pair->two, NULL, 1);
764 update_stages(dst_name2, NULL, NULL, ren2->pair->two, 1);
765 }
766 while (delp--)
767 free(del[delp]);
768 }
770 static void conflict_rename_dir(struct merge_options *o,
771 struct rename *ren1,
772 const char *branch1)
773 {
774 char *new_path = unique_path(o, ren1->pair->two->path, branch1);
775 output(o, 1, "Renaming %s to %s instead", ren1->pair->one->path, new_path);
776 remove_file(o, 0, ren1->pair->two->path, 0);
777 update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path);
778 free(new_path);
779 }
781 static void conflict_rename_rename_2(struct merge_options *o,
782 struct rename *ren1,
783 const char *branch1,
784 struct rename *ren2,
785 const char *branch2)
786 {
787 char *new_path1 = unique_path(o, ren1->pair->two->path, branch1);
788 char *new_path2 = unique_path(o, ren2->pair->two->path, branch2);
789 output(o, 1, "Renaming %s to %s and %s to %s instead",
790 ren1->pair->one->path, new_path1,
791 ren2->pair->one->path, new_path2);
792 remove_file(o, 0, ren1->pair->two->path, 0);
793 update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path1);
794 update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, new_path2);
795 free(new_path2);
796 free(new_path1);
797 }
799 static int process_renames(struct merge_options *o,
800 struct string_list *a_renames,
801 struct string_list *b_renames)
802 {
803 int clean_merge = 1, i, j;
804 struct string_list a_by_dst = {NULL, 0, 0, 0}, b_by_dst = {NULL, 0, 0, 0};
805 const struct rename *sre;
807 for (i = 0; i < a_renames->nr; i++) {
808 sre = a_renames->items[i].util;
809 string_list_insert(sre->pair->two->path, &a_by_dst)->util
810 = sre->dst_entry;
811 }
812 for (i = 0; i < b_renames->nr; i++) {
813 sre = b_renames->items[i].util;
814 string_list_insert(sre->pair->two->path, &b_by_dst)->util
815 = sre->dst_entry;
816 }
818 for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
819 char *src;
820 struct string_list *renames1, *renames2Dst;
821 struct rename *ren1 = NULL, *ren2 = NULL;
822 const char *branch1, *branch2;
823 const char *ren1_src, *ren1_dst;
825 if (i >= a_renames->nr) {
826 ren2 = b_renames->items[j++].util;
827 } else if (j >= b_renames->nr) {
828 ren1 = a_renames->items[i++].util;
829 } else {
830 int compare = strcmp(a_renames->items[i].string,
831 b_renames->items[j].string);
832 if (compare <= 0)
833 ren1 = a_renames->items[i++].util;
834 if (compare >= 0)
835 ren2 = b_renames->items[j++].util;
836 }
838 /* TODO: refactor, so that 1/2 are not needed */
839 if (ren1) {
840 renames1 = a_renames;
841 renames2Dst = &b_by_dst;
842 branch1 = o->branch1;
843 branch2 = o->branch2;
844 } else {
845 struct rename *tmp;
846 renames1 = b_renames;
847 renames2Dst = &a_by_dst;
848 branch1 = o->branch2;
849 branch2 = o->branch1;
850 tmp = ren2;
851 ren2 = ren1;
852 ren1 = tmp;
853 }
854 src = ren1->pair->one->path;
856 ren1->dst_entry->processed = 1;
857 ren1->src_entry->processed = 1;
859 if (ren1->processed)
860 continue;
861 ren1->processed = 1;
863 ren1_src = ren1->pair->one->path;
864 ren1_dst = ren1->pair->two->path;
866 if (ren2) {
867 const char *ren2_src = ren2->pair->one->path;
868 const char *ren2_dst = ren2->pair->two->path;
869 /* Renamed in 1 and renamed in 2 */
870 if (strcmp(ren1_src, ren2_src) != 0)
871 die("ren1.src != ren2.src");
872 ren2->dst_entry->processed = 1;
873 ren2->processed = 1;
874 if (strcmp(ren1_dst, ren2_dst) != 0) {
875 clean_merge = 0;
876 output(o, 1, "CONFLICT (rename/rename): "
877 "Rename \"%s\"->\"%s\" in branch \"%s\" "
878 "rename \"%s\"->\"%s\" in \"%s\"%s",
879 src, ren1_dst, branch1,
880 src, ren2_dst, branch2,
881 o->call_depth ? " (left unresolved)": "");
882 if (o->call_depth) {
883 remove_file_from_cache(src);
884 update_file(o, 0, ren1->pair->one->sha1,
885 ren1->pair->one->mode, src);
886 }
887 conflict_rename_rename(o, ren1, branch1, ren2, branch2);
888 } else {
889 struct merge_file_info mfi;
890 remove_file(o, 1, ren1_src, 1);
891 mfi = merge_file(o,
892 ren1->pair->one,
893 ren1->pair->two,
894 ren2->pair->two,
895 branch1,
896 branch2);
897 if (mfi.merge || !mfi.clean)
898 output(o, 1, "Renaming %s->%s", src, ren1_dst);
900 if (mfi.merge)
901 output(o, 2, "Auto-merging %s", ren1_dst);
903 if (!mfi.clean) {
904 output(o, 1, "CONFLICT (content): merge conflict in %s",
905 ren1_dst);
906 clean_merge = 0;
908 if (!o->call_depth)
909 update_stages(ren1_dst,
910 ren1->pair->one,
911 ren1->pair->two,
912 ren2->pair->two,
913 1 /* clear */);
914 }
915 update_file(o, mfi.clean, mfi.sha, mfi.mode, ren1_dst);
916 }
917 } else {
918 /* Renamed in 1, maybe changed in 2 */
919 struct string_list_item *item;
920 /* we only use sha1 and mode of these */
921 struct diff_filespec src_other, dst_other;
922 int try_merge, stage = a_renames == renames1 ? 3: 2;
924 remove_file(o, 1, ren1_src, o->call_depth || stage == 3);
926 hashcpy(src_other.sha1, ren1->src_entry->stages[stage].sha);
927 src_other.mode = ren1->src_entry->stages[stage].mode;
928 hashcpy(dst_other.sha1, ren1->dst_entry->stages[stage].sha);
929 dst_other.mode = ren1->dst_entry->stages[stage].mode;
931 try_merge = 0;
933 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
934 clean_merge = 0;
935 output(o, 1, "CONFLICT (rename/directory): Rename %s->%s in %s "
936 " directory %s added in %s",
937 ren1_src, ren1_dst, branch1,
938 ren1_dst, branch2);
939 conflict_rename_dir(o, ren1, branch1);
940 } else if (sha_eq(src_other.sha1, null_sha1)) {
941 clean_merge = 0;
942 output(o, 1, "CONFLICT (rename/delete): Rename %s->%s in %s "
943 "and deleted in %s",
944 ren1_src, ren1_dst, branch1,
945 branch2);
946 update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst);
947 if (!o->call_depth)
948 update_stages(ren1_dst, NULL,
949 branch1 == o->branch1 ?
950 ren1->pair->two : NULL,
951 branch1 == o->branch1 ?
952 NULL : ren1->pair->two, 1);
953 } else if (!sha_eq(dst_other.sha1, null_sha1)) {
954 const char *new_path;
955 clean_merge = 0;
956 try_merge = 1;
957 output(o, 1, "CONFLICT (rename/add): Rename %s->%s in %s. "
958 "%s added in %s",
959 ren1_src, ren1_dst, branch1,
960 ren1_dst, branch2);
961 if (o->call_depth) {
962 struct merge_file_info mfi;
963 struct diff_filespec one, a, b;
965 one.path = a.path = b.path =
966 (char *)ren1_dst;
967 hashcpy(one.sha1, null_sha1);
968 one.mode = 0;
969 hashcpy(a.sha1, ren1->pair->two->sha1);
970 a.mode = ren1->pair->two->mode;
971 hashcpy(b.sha1, dst_other.sha1);
972 b.mode = dst_other.mode;
973 mfi = merge_file(o, &one, &a, &b,
974 branch1,
975 branch2);
976 output(o, 1, "Adding merged %s", ren1_dst);
977 update_file(o, 0,
978 mfi.sha,
979 mfi.mode,
980 ren1_dst);
981 } else {
982 new_path = unique_path(o, ren1_dst, branch2);
983 output(o, 1, "Adding as %s instead", new_path);
984 update_file(o, 0, dst_other.sha1, dst_other.mode, new_path);
985 }
986 } else if ((item = string_list_lookup(ren1_dst, renames2Dst))) {
987 ren2 = item->util;
988 clean_merge = 0;
989 ren2->processed = 1;
990 output(o, 1, "CONFLICT (rename/rename): "
991 "Rename %s->%s in %s. "
992 "Rename %s->%s in %s",
993 ren1_src, ren1_dst, branch1,
994 ren2->pair->one->path, ren2->pair->two->path, branch2);
995 conflict_rename_rename_2(o, ren1, branch1, ren2, branch2);
996 } else
997 try_merge = 1;
999 if (try_merge) {
1000 struct diff_filespec *one, *a, *b;
1001 struct merge_file_info mfi;
1002 src_other.path = (char *)ren1_src;
1004 one = ren1->pair->one;
1005 if (a_renames == renames1) {
1006 a = ren1->pair->two;
1007 b = &src_other;
1008 } else {
1009 b = ren1->pair->two;
1010 a = &src_other;
1011 }
1012 mfi = merge_file(o, one, a, b,
1013 o->branch1, o->branch2);
1015 if (mfi.clean &&
1016 sha_eq(mfi.sha, ren1->pair->two->sha1) &&
1017 mfi.mode == ren1->pair->two->mode)
1018 /*
1019 * This messaged is part of
1020 * t6022 test. If you change
1021 * it update the test too.
1022 */
1023 output(o, 3, "Skipped %s (merged same as existing)", ren1_dst);
1024 else {
1025 if (mfi.merge || !mfi.clean)
1026 output(o, 1, "Renaming %s => %s", ren1_src, ren1_dst);
1027 if (mfi.merge)
1028 output(o, 2, "Auto-merging %s", ren1_dst);
1029 if (!mfi.clean) {
1030 output(o, 1, "CONFLICT (rename/modify): Merge conflict in %s",
1031 ren1_dst);
1032 clean_merge = 0;
1034 if (!o->call_depth)
1035 update_stages(ren1_dst,
1036 one, a, b, 1);
1037 }
1038 update_file(o, mfi.clean, mfi.sha, mfi.mode, ren1_dst);
1039 }
1040 }
1041 }
1042 }
1043 string_list_clear(&a_by_dst, 0);
1044 string_list_clear(&b_by_dst, 0);
1046 return clean_merge;
1047 }
1049 static unsigned char *stage_sha(const unsigned char *sha, unsigned mode)
1050 {
1051 return (is_null_sha1(sha) || mode == 0) ? NULL: (unsigned char *)sha;
1052 }
1054 /* Per entry merge function */
1055 static int process_entry(struct merge_options *o,
1056 const char *path, struct stage_data *entry)
1057 {
1058 /*
1059 printf("processing entry, clean cache: %s\n", index_only ? "yes": "no");
1060 print_index_entry("\tpath: ", entry);
1061 */
1062 int clean_merge = 1;
1063 unsigned o_mode = entry->stages[1].mode;
1064 unsigned a_mode = entry->stages[2].mode;
1065 unsigned b_mode = entry->stages[3].mode;
1066 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1067 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1068 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1070 if (o_sha && (!a_sha || !b_sha)) {
1071 /* Case A: Deleted in one */
1072 if ((!a_sha && !b_sha) ||
1073 (sha_eq(a_sha, o_sha) && !b_sha) ||
1074 (!a_sha && sha_eq(b_sha, o_sha))) {
1075 /* Deleted in both or deleted in one and
1076 * unchanged in the other */
1077 if (a_sha)
1078 output(o, 2, "Removing %s", path);
1079 /* do not touch working file if it did not exist */
1080 remove_file(o, 1, path, !a_sha);
1081 } else {
1082 /* Deleted in one and changed in the other */
1083 clean_merge = 0;
1084 if (!a_sha) {
1085 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1086 "and modified in %s. Version %s of %s left in tree.",
1087 path, o->branch1,
1088 o->branch2, o->branch2, path);
1089 update_file(o, 0, b_sha, b_mode, path);
1090 } else {
1091 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
1092 "and modified in %s. Version %s of %s left in tree.",
1093 path, o->branch2,
1094 o->branch1, o->branch1, path);
1095 update_file(o, 0, a_sha, a_mode, path);
1096 }
1097 }
1099 } else if ((!o_sha && a_sha && !b_sha) ||
1100 (!o_sha && !a_sha && b_sha)) {
1101 /* Case B: Added in one. */
1102 const char *add_branch;
1103 const char *other_branch;
1104 unsigned mode;
1105 const unsigned char *sha;
1106 const char *conf;
1108 if (a_sha) {
1109 add_branch = o->branch1;
1110 other_branch = o->branch2;
1111 mode = a_mode;
1112 sha = a_sha;
1113 conf = "file/directory";
1114 } else {
1115 add_branch = o->branch2;
1116 other_branch = o->branch1;
1117 mode = b_mode;
1118 sha = b_sha;
1119 conf = "directory/file";
1120 }
1121 if (string_list_has_string(&o->current_directory_set, path)) {
1122 const char *new_path = unique_path(o, path, add_branch);
1123 clean_merge = 0;
1124 output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. "
1125 "Adding %s as %s",
1126 conf, path, other_branch, path, new_path);
1127 remove_file(o, 0, path, 0);
1128 update_file(o, 0, sha, mode, new_path);
1129 } else {
1130 output(o, 2, "Adding %s", path);
1131 update_file(o, 1, sha, mode, path);
1132 }
1133 } else if (a_sha && b_sha) {
1134 /* Case C: Added in both (check for same permissions) and */
1135 /* case D: Modified in both, but differently. */
1136 const char *reason = "content";
1137 struct merge_file_info mfi;
1138 struct diff_filespec one, a, b;
1140 if (!o_sha) {
1141 reason = "add/add";
1142 o_sha = (unsigned char *)null_sha1;
1143 }
1144 output(o, 2, "Auto-merging %s", path);
1145 one.path = a.path = b.path = (char *)path;
1146 hashcpy(one.sha1, o_sha);
1147 one.mode = o_mode;
1148 hashcpy(a.sha1, a_sha);
1149 a.mode = a_mode;
1150 hashcpy(b.sha1, b_sha);
1151 b.mode = b_mode;
1153 mfi = merge_file(o, &one, &a, &b,
1154 o->branch1, o->branch2);
1156 clean_merge = mfi.clean;
1157 if (!mfi.clean) {
1158 if (S_ISGITLINK(mfi.mode))
1159 reason = "submodule";
1160 output(o, 1, "CONFLICT (%s): Merge conflict in %s",
1161 reason, path);
1162 }
1163 update_file(o, mfi.clean, mfi.sha, mfi.mode, path);
1164 } else if (!o_sha && !a_sha && !b_sha) {
1165 /*
1166 * this entry was deleted altogether. a_mode == 0 means
1167 * we had that path and want to actively remove it.
1168 */
1169 remove_file(o, 1, path, !a_mode);
1170 } else
1171 die("Fatal merge failure, shouldn't happen.");
1173 return clean_merge;
1174 }
1176 struct unpack_trees_error_msgs get_porcelain_error_msgs(void)
1177 {
1178 struct unpack_trees_error_msgs msgs = {
1179 /* would_overwrite */
1180 "Your local changes to '%s' would be overwritten by merge. Aborting.",
1181 /* not_uptodate_file */
1182 "Your local changes to '%s' would be overwritten by merge. Aborting.",
1183 /* not_uptodate_dir */
1184 "Updating '%s' would lose untracked files in it. Aborting.",
1185 /* would_lose_untracked */
1186 "Untracked working tree file '%s' would be %s by merge. Aborting",
1187 /* bind_overlap -- will not happen here */
1188 NULL,
1189 };
1190 if (advice_commit_before_merge) {
1191 msgs.would_overwrite = msgs.not_uptodate_file =
1192 "Your local changes to '%s' would be overwritten by merge. Aborting.\n"
1193 "Please, commit your changes or stash them before you can merge.";
1194 }
1195 return msgs;
1196 }
1198 int merge_trees(struct merge_options *o,
1199 struct tree *head,
1200 struct tree *merge,
1201 struct tree *common,
1202 struct tree **result)
1203 {
1204 int code, clean;
1206 if (o->subtree_shift) {
1207 merge = shift_tree_object(head, merge, o->subtree_shift);
1208 common = shift_tree_object(head, common, o->subtree_shift);
1209 }
1211 if (sha_eq(common->object.sha1, merge->object.sha1)) {
1212 output(o, 0, "Already uptodate!");
1213 *result = head;
1214 return 1;
1215 }
1217 code = git_merge_trees(o->call_depth, common, head, merge);
1219 if (code != 0) {
1220 if (show(o, 4) || o->call_depth)
1221 die("merging of trees %s and %s failed",
1222 sha1_to_hex(head->object.sha1),
1223 sha1_to_hex(merge->object.sha1));
1224 else
1225 exit(128);
1226 }
1228 if (unmerged_cache()) {
1229 struct string_list *entries, *re_head, *re_merge;
1230 int i;
1231 string_list_clear(&o->current_file_set, 1);
1232 string_list_clear(&o->current_directory_set, 1);
1233 get_files_dirs(o, head);
1234 get_files_dirs(o, merge);
1236 entries = get_unmerged();
1237 re_head = get_renames(o, head, common, head, merge, entries);
1238 re_merge = get_renames(o, merge, common, head, merge, entries);
1239 clean = process_renames(o, re_head, re_merge);
1240 for (i = 0; i < entries->nr; i++) {
1241 const char *path = entries->items[i].string;
1242 struct stage_data *e = entries->items[i].util;
1243 if (!e->processed
1244 && !process_entry(o, path, e))
1245 clean = 0;
1246 }
1248 string_list_clear(re_merge, 0);
1249 string_list_clear(re_head, 0);
1250 string_list_clear(entries, 1);
1252 }
1253 else
1254 clean = 1;
1256 if (o->call_depth)
1257 *result = write_tree_from_memory(o);
1259 return clean;
1260 }
1262 static struct commit_list *reverse_commit_list(struct commit_list *list)
1263 {
1264 struct commit_list *next = NULL, *current, *backup;
1265 for (current = list; current; current = backup) {
1266 backup = current->next;
1267 current->next = next;
1268 next = current;
1269 }
1270 return next;
1271 }
1273 /*
1274 * Merge the commits h1 and h2, return the resulting virtual
1275 * commit object and a flag indicating the cleanness of the merge.
1276 */
1277 int merge_recursive(struct merge_options *o,
1278 struct commit *h1,
1279 struct commit *h2,
1280 struct commit_list *ca,
1281 struct commit **result)
1282 {
1283 struct commit_list *iter;
1284 struct commit *merged_common_ancestors;
1285 struct tree *mrtree = mrtree;
1286 int clean;
1288 if (show(o, 4)) {
1289 output(o, 4, "Merging:");
1290 output_commit_title(o, h1);
1291 output_commit_title(o, h2);
1292 }
1294 if (!ca) {
1295 ca = get_merge_bases(h1, h2, 1);
1296 ca = reverse_commit_list(ca);
1297 }
1299 if (show(o, 5)) {
1300 output(o, 5, "found %u common ancestor(s):", commit_list_count(ca));
1301 for (iter = ca; iter; iter = iter->next)
1302 output_commit_title(o, iter->item);
1303 }
1305 merged_common_ancestors = pop_commit(&ca);
1306 if (merged_common_ancestors == NULL) {
1307 /* if there is no common ancestor, make an empty tree */
1308 struct tree *tree = xcalloc(1, sizeof(struct tree));
1310 tree->object.parsed = 1;
1311 tree->object.type = OBJ_TREE;
1312 pretend_sha1_file(NULL, 0, OBJ_TREE, tree->object.sha1);
1313 merged_common_ancestors = make_virtual_commit(tree, "ancestor");
1314 }
1316 for (iter = ca; iter; iter = iter->next) {
1317 const char *saved_b1, *saved_b2;
1318 o->call_depth++;
1319 /*
1320 * When the merge fails, the result contains files
1321 * with conflict markers. The cleanness flag is
1322 * ignored, it was never actually used, as result of
1323 * merge_trees has always overwritten it: the committed
1324 * "conflicts" were already resolved.
1325 */
1326 discard_cache();
1327 saved_b1 = o->branch1;
1328 saved_b2 = o->branch2;
1329 o->branch1 = "Temporary merge branch 1";
1330 o->branch2 = "Temporary merge branch 2";
1331 merge_recursive(o, merged_common_ancestors, iter->item,
1332 NULL, &merged_common_ancestors);
1333 o->branch1 = saved_b1;
1334 o->branch2 = saved_b2;
1335 o->call_depth--;
1337 if (!merged_common_ancestors)
1338 die("merge returned no commit");
1339 }
1341 discard_cache();
1342 if (!o->call_depth)
1343 read_cache();
1345 clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
1346 &mrtree);
1348 if (o->call_depth) {
1349 *result = make_virtual_commit(mrtree, "merged tree");
1350 commit_list_insert(h1, &(*result)->parents);
1351 commit_list_insert(h2, &(*result)->parents->next);
1352 }
1353 flush_output(o);
1354 return clean;
1355 }
1357 static struct commit *get_ref(const unsigned char *sha1, const char *name)
1358 {
1359 struct object *object;
1361 object = deref_tag(parse_object(sha1), name, strlen(name));
1362 if (!object)
1363 return NULL;
1364 if (object->type == OBJ_TREE)
1365 return make_virtual_commit((struct tree*)object, name);
1366 if (object->type != OBJ_COMMIT)
1367 return NULL;
1368 if (parse_commit((struct commit *)object))
1369 return NULL;
1370 return (struct commit *)object;
1371 }
1373 int merge_recursive_generic(struct merge_options *o,
1374 const unsigned char *head,
1375 const unsigned char *merge,
1376 int num_base_list,
1377 const unsigned char **base_list,
1378 struct commit **result)
1379 {
1380 int clean, index_fd;
1381 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
1382 struct commit *head_commit = get_ref(head, o->branch1);
1383 struct commit *next_commit = get_ref(merge, o->branch2);
1384 struct commit_list *ca = NULL;
1386 if (base_list) {
1387 int i;
1388 for (i = 0; i < num_base_list; ++i) {
1389 struct commit *base;
1390 if (!(base = get_ref(base_list[i], sha1_to_hex(base_list[i]))))
1391 return error("Could not parse object '%s'",
1392 sha1_to_hex(base_list[i]));
1393 commit_list_insert(base, &ca);
1394 }
1395 }
1397 index_fd = hold_locked_index(lock, 1);
1398 clean = merge_recursive(o, head_commit, next_commit, ca,
1399 result);
1400 if (active_cache_changed &&
1401 (write_cache(index_fd, active_cache, active_nr) ||
1402 commit_locked_index(lock)))
1403 return error("Unable to write index.");
1405 return clean ? 0 : 1;
1406 }
1408 static int merge_recursive_config(const char *var, const char *value, void *cb)
1409 {
1410 struct merge_options *o = cb;
1411 if (!strcasecmp(var, "merge.verbosity")) {
1412 o->verbosity = git_config_int(var, value);
1413 return 0;
1414 }
1415 if (!strcasecmp(var, "diff.renamelimit")) {
1416 o->diff_rename_limit = git_config_int(var, value);
1417 return 0;
1418 }
1419 if (!strcasecmp(var, "merge.renamelimit")) {
1420 o->merge_rename_limit = git_config_int(var, value);
1421 return 0;
1422 }
1423 return git_xmerge_config(var, value, cb);
1424 }
1426 void init_merge_options(struct merge_options *o)
1427 {
1428 memset(o, 0, sizeof(struct merge_options));
1429 o->verbosity = 2;
1430 o->buffer_output = 1;
1431 o->diff_rename_limit = -1;
1432 o->merge_rename_limit = -1;
1433 git_config(merge_recursive_config, o);
1434 if (getenv("GIT_MERGE_VERBOSITY"))
1435 o->verbosity =
1436 strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10);
1437 if (o->verbosity >= 5)
1438 o->buffer_output = 0;
1439 strbuf_init(&o->obuf, 0);
1440 memset(&o->current_file_set, 0, sizeof(struct string_list));
1441 o->current_file_set.strdup_strings = 1;
1442 memset(&o->current_directory_set, 0, sizeof(struct string_list));
1443 o->current_directory_set.strdup_strings = 1;
1444 }