Convert struct object to object_id
[git/git.git] / merge-recursive.c
1 /*
2 * Recursive Merge algorithm stolen from git-merge-recursive.py by
3 * Fredrik Kuivinen.
4 * The thieves were Alex Riesen and Johannes Schindelin, in June/July 2006
5 */
6 #include "cache.h"
7 #include "advice.h"
8 #include "lockfile.h"
9 #include "cache-tree.h"
10 #include "commit.h"
11 #include "blob.h"
12 #include "builtin.h"
13 #include "tree-walk.h"
14 #include "diff.h"
15 #include "diffcore.h"
16 #include "tag.h"
17 #include "unpack-trees.h"
18 #include "string-list.h"
19 #include "xdiff-interface.h"
20 #include "ll-merge.h"
21 #include "attr.h"
22 #include "merge-recursive.h"
23 #include "dir.h"
24 #include "submodule.h"
25
26 static struct tree *shift_tree_object(struct tree *one, struct tree *two,
27 const char *subtree_shift)
28 {
29 struct object_id shifted;
30
31 if (!*subtree_shift) {
32 shift_tree(get_object_hash(one->object), get_object_hash(two->object), shifted.hash, 0);
33 } else {
34 shift_tree_by(get_object_hash(one->object), get_object_hash(two->object), shifted.hash,
35 subtree_shift);
36 }
37 if (!oidcmp(&two->object.oid, &shifted))
38 return two;
39 return lookup_tree(shifted.hash);
40 }
41
42 static struct commit *make_virtual_commit(struct tree *tree, const char *comment)
43 {
44 struct commit *commit = alloc_commit_node();
45 struct merge_remote_desc *desc = xmalloc(sizeof(*desc));
46
47 desc->name = comment;
48 desc->obj = (struct object *)commit;
49 commit->tree = tree;
50 commit->util = desc;
51 commit->object.parsed = 1;
52 return commit;
53 }
54
55 /*
56 * Since we use get_tree_entry(), which does not put the read object into
57 * the object pool, we cannot rely on a == b.
58 */
59 static int sha_eq(const unsigned char *a, const unsigned char *b)
60 {
61 if (!a && !b)
62 return 2;
63 return a && b && hashcmp(a, b) == 0;
64 }
65
66 enum rename_type {
67 RENAME_NORMAL = 0,
68 RENAME_DELETE,
69 RENAME_ONE_FILE_TO_ONE,
70 RENAME_ONE_FILE_TO_TWO,
71 RENAME_TWO_FILES_TO_ONE
72 };
73
74 struct rename_conflict_info {
75 enum rename_type rename_type;
76 struct diff_filepair *pair1;
77 struct diff_filepair *pair2;
78 const char *branch1;
79 const char *branch2;
80 struct stage_data *dst_entry1;
81 struct stage_data *dst_entry2;
82 struct diff_filespec ren1_other;
83 struct diff_filespec ren2_other;
84 };
85
86 /*
87 * Since we want to write the index eventually, we cannot reuse the index
88 * for these (temporary) data.
89 */
90 struct stage_data {
91 struct {
92 unsigned mode;
93 unsigned char sha[20];
94 } stages[4];
95 struct rename_conflict_info *rename_conflict_info;
96 unsigned processed:1;
97 };
98
99 static inline void setup_rename_conflict_info(enum rename_type rename_type,
100 struct diff_filepair *pair1,
101 struct diff_filepair *pair2,
102 const char *branch1,
103 const char *branch2,
104 struct stage_data *dst_entry1,
105 struct stage_data *dst_entry2,
106 struct merge_options *o,
107 struct stage_data *src_entry1,
108 struct stage_data *src_entry2)
109 {
110 struct rename_conflict_info *ci = xcalloc(1, sizeof(struct rename_conflict_info));
111 ci->rename_type = rename_type;
112 ci->pair1 = pair1;
113 ci->branch1 = branch1;
114 ci->branch2 = branch2;
115
116 ci->dst_entry1 = dst_entry1;
117 dst_entry1->rename_conflict_info = ci;
118 dst_entry1->processed = 0;
119
120 assert(!pair2 == !dst_entry2);
121 if (dst_entry2) {
122 ci->dst_entry2 = dst_entry2;
123 ci->pair2 = pair2;
124 dst_entry2->rename_conflict_info = ci;
125 }
126
127 if (rename_type == RENAME_TWO_FILES_TO_ONE) {
128 /*
129 * For each rename, there could have been
130 * modifications on the side of history where that
131 * file was not renamed.
132 */
133 int ostage1 = o->branch1 == branch1 ? 3 : 2;
134 int ostage2 = ostage1 ^ 1;
135
136 ci->ren1_other.path = pair1->one->path;
137 hashcpy(ci->ren1_other.sha1, src_entry1->stages[ostage1].sha);
138 ci->ren1_other.mode = src_entry1->stages[ostage1].mode;
139
140 ci->ren2_other.path = pair2->one->path;
141 hashcpy(ci->ren2_other.sha1, src_entry2->stages[ostage2].sha);
142 ci->ren2_other.mode = src_entry2->stages[ostage2].mode;
143 }
144 }
145
146 static int show(struct merge_options *o, int v)
147 {
148 return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5;
149 }
150
151 static void flush_output(struct merge_options *o)
152 {
153 if (o->obuf.len) {
154 fputs(o->obuf.buf, stdout);
155 strbuf_reset(&o->obuf);
156 }
157 }
158
159 __attribute__((format (printf, 3, 4)))
160 static void output(struct merge_options *o, int v, const char *fmt, ...)
161 {
162 va_list ap;
163
164 if (!show(o, v))
165 return;
166
167 strbuf_addchars(&o->obuf, ' ', o->call_depth * 2);
168
169 va_start(ap, fmt);
170 strbuf_vaddf(&o->obuf, fmt, ap);
171 va_end(ap);
172
173 strbuf_addch(&o->obuf, '\n');
174 if (!o->buffer_output)
175 flush_output(o);
176 }
177
178 static void output_commit_title(struct merge_options *o, struct commit *commit)
179 {
180 int i;
181 flush_output(o);
182 for (i = o->call_depth; i--;)
183 fputs(" ", stdout);
184 if (commit->util)
185 printf("virtual %s\n", merge_remote_util(commit)->name);
186 else {
187 printf("%s ", find_unique_abbrev(get_object_hash(commit->object), DEFAULT_ABBREV));
188 if (parse_commit(commit) != 0)
189 printf(_("(bad commit)\n"));
190 else {
191 const char *title;
192 const char *msg = get_commit_buffer(commit, NULL);
193 int len = find_commit_subject(msg, &title);
194 if (len)
195 printf("%.*s\n", len, title);
196 unuse_commit_buffer(commit, msg);
197 }
198 }
199 }
200
201 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
202 const char *path, int stage, int refresh, int options)
203 {
204 struct cache_entry *ce;
205 ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage,
206 (refresh ? (CE_MATCH_REFRESH |
207 CE_MATCH_IGNORE_MISSING) : 0 ));
208 if (!ce)
209 return error(_("addinfo_cache failed for path '%s'"), path);
210 return add_cache_entry(ce, options);
211 }
212
213 static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree)
214 {
215 parse_tree(tree);
216 init_tree_desc(desc, tree->buffer, tree->size);
217 }
218
219 static int git_merge_trees(int index_only,
220 struct tree *common,
221 struct tree *head,
222 struct tree *merge)
223 {
224 int rc;
225 struct tree_desc t[3];
226 struct unpack_trees_options opts;
227
228 memset(&opts, 0, sizeof(opts));
229 if (index_only)
230 opts.index_only = 1;
231 else
232 opts.update = 1;
233 opts.merge = 1;
234 opts.head_idx = 2;
235 opts.fn = threeway_merge;
236 opts.src_index = &the_index;
237 opts.dst_index = &the_index;
238 setup_unpack_trees_porcelain(&opts, "merge");
239
240 init_tree_desc_from_tree(t+0, common);
241 init_tree_desc_from_tree(t+1, head);
242 init_tree_desc_from_tree(t+2, merge);
243
244 rc = unpack_trees(3, t, &opts);
245 cache_tree_free(&active_cache_tree);
246 return rc;
247 }
248
249 struct tree *write_tree_from_memory(struct merge_options *o)
250 {
251 struct tree *result = NULL;
252
253 if (unmerged_cache()) {
254 int i;
255 fprintf(stderr, "BUG: There are unmerged index entries:\n");
256 for (i = 0; i < active_nr; i++) {
257 const struct cache_entry *ce = active_cache[i];
258 if (ce_stage(ce))
259 fprintf(stderr, "BUG: %d %.*s\n", ce_stage(ce),
260 (int)ce_namelen(ce), ce->name);
261 }
262 die("Bug in merge-recursive.c");
263 }
264
265 if (!active_cache_tree)
266 active_cache_tree = cache_tree();
267
268 if (!cache_tree_fully_valid(active_cache_tree) &&
269 cache_tree_update(&the_index, 0) < 0)
270 die(_("error building trees"));
271
272 result = lookup_tree(active_cache_tree->sha1);
273
274 return result;
275 }
276
277 static int save_files_dirs(const unsigned char *sha1,
278 struct strbuf *base, const char *path,
279 unsigned int mode, int stage, void *context)
280 {
281 int baselen = base->len;
282 struct merge_options *o = context;
283
284 strbuf_addstr(base, path);
285
286 if (S_ISDIR(mode))
287 string_list_insert(&o->current_directory_set, base->buf);
288 else
289 string_list_insert(&o->current_file_set, base->buf);
290
291 strbuf_setlen(base, baselen);
292 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
293 }
294
295 static int get_files_dirs(struct merge_options *o, struct tree *tree)
296 {
297 int n;
298 struct pathspec match_all;
299 memset(&match_all, 0, sizeof(match_all));
300 if (read_tree_recursive(tree, "", 0, 0, &match_all, save_files_dirs, o))
301 return 0;
302 n = o->current_file_set.nr + o->current_directory_set.nr;
303 return n;
304 }
305
306 /*
307 * Returns an index_entry instance which doesn't have to correspond to
308 * a real cache entry in Git's index.
309 */
310 static struct stage_data *insert_stage_data(const char *path,
311 struct tree *o, struct tree *a, struct tree *b,
312 struct string_list *entries)
313 {
314 struct string_list_item *item;
315 struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
316 get_tree_entry(get_object_hash(o->object), path,
317 e->stages[1].sha, &e->stages[1].mode);
318 get_tree_entry(get_object_hash(a->object), path,
319 e->stages[2].sha, &e->stages[2].mode);
320 get_tree_entry(get_object_hash(b->object), path,
321 e->stages[3].sha, &e->stages[3].mode);
322 item = string_list_insert(entries, path);
323 item->util = e;
324 return e;
325 }
326
327 /*
328 * Create a dictionary mapping file names to stage_data objects. The
329 * dictionary contains one entry for every path with a non-zero stage entry.
330 */
331 static struct string_list *get_unmerged(void)
332 {
333 struct string_list *unmerged = xcalloc(1, sizeof(struct string_list));
334 int i;
335
336 unmerged->strdup_strings = 1;
337
338 for (i = 0; i < active_nr; i++) {
339 struct string_list_item *item;
340 struct stage_data *e;
341 const struct cache_entry *ce = active_cache[i];
342 if (!ce_stage(ce))
343 continue;
344
345 item = string_list_lookup(unmerged, ce->name);
346 if (!item) {
347 item = string_list_insert(unmerged, ce->name);
348 item->util = xcalloc(1, sizeof(struct stage_data));
349 }
350 e = item->util;
351 e->stages[ce_stage(ce)].mode = ce->ce_mode;
352 hashcpy(e->stages[ce_stage(ce)].sha, ce->sha1);
353 }
354
355 return unmerged;
356 }
357
358 static int string_list_df_name_compare(const void *a, const void *b)
359 {
360 const struct string_list_item *one = a;
361 const struct string_list_item *two = b;
362 int onelen = strlen(one->string);
363 int twolen = strlen(two->string);
364 /*
365 * Here we only care that entries for D/F conflicts are
366 * adjacent, in particular with the file of the D/F conflict
367 * appearing before files below the corresponding directory.
368 * The order of the rest of the list is irrelevant for us.
369 *
370 * To achieve this, we sort with df_name_compare and provide
371 * the mode S_IFDIR so that D/F conflicts will sort correctly.
372 * We use the mode S_IFDIR for everything else for simplicity,
373 * since in other cases any changes in their order due to
374 * sorting cause no problems for us.
375 */
376 int cmp = df_name_compare(one->string, onelen, S_IFDIR,
377 two->string, twolen, S_IFDIR);
378 /*
379 * Now that 'foo' and 'foo/bar' compare equal, we have to make sure
380 * that 'foo' comes before 'foo/bar'.
381 */
382 if (cmp)
383 return cmp;
384 return onelen - twolen;
385 }
386
387 static void record_df_conflict_files(struct merge_options *o,
388 struct string_list *entries)
389 {
390 /* If there is a D/F conflict and the file for such a conflict
391 * currently exist in the working tree, we want to allow it to be
392 * removed to make room for the corresponding directory if needed.
393 * The files underneath the directories of such D/F conflicts will
394 * be processed before the corresponding file involved in the D/F
395 * conflict. If the D/F directory ends up being removed by the
396 * merge, then we won't have to touch the D/F file. If the D/F
397 * directory needs to be written to the working copy, then the D/F
398 * file will simply be removed (in make_room_for_path()) to make
399 * room for the necessary paths. Note that if both the directory
400 * and the file need to be present, then the D/F file will be
401 * reinstated with a new unique name at the time it is processed.
402 */
403 struct string_list df_sorted_entries;
404 const char *last_file = NULL;
405 int last_len = 0;
406 int i;
407
408 /*
409 * If we're merging merge-bases, we don't want to bother with
410 * any working directory changes.
411 */
412 if (o->call_depth)
413 return;
414
415 /* Ensure D/F conflicts are adjacent in the entries list. */
416 memset(&df_sorted_entries, 0, sizeof(struct string_list));
417 for (i = 0; i < entries->nr; i++) {
418 struct string_list_item *next = &entries->items[i];
419 string_list_append(&df_sorted_entries, next->string)->util =
420 next->util;
421 }
422 qsort(df_sorted_entries.items, entries->nr, sizeof(*entries->items),
423 string_list_df_name_compare);
424
425 string_list_clear(&o->df_conflict_file_set, 1);
426 for (i = 0; i < df_sorted_entries.nr; i++) {
427 const char *path = df_sorted_entries.items[i].string;
428 int len = strlen(path);
429 struct stage_data *e = df_sorted_entries.items[i].util;
430
431 /*
432 * Check if last_file & path correspond to a D/F conflict;
433 * i.e. whether path is last_file+'/'+<something>.
434 * If so, record that it's okay to remove last_file to make
435 * room for path and friends if needed.
436 */
437 if (last_file &&
438 len > last_len &&
439 memcmp(path, last_file, last_len) == 0 &&
440 path[last_len] == '/') {
441 string_list_insert(&o->df_conflict_file_set, last_file);
442 }
443
444 /*
445 * Determine whether path could exist as a file in the
446 * working directory as a possible D/F conflict. This
447 * will only occur when it exists in stage 2 as a
448 * file.
449 */
450 if (S_ISREG(e->stages[2].mode) || S_ISLNK(e->stages[2].mode)) {
451 last_file = path;
452 last_len = len;
453 } else {
454 last_file = NULL;
455 }
456 }
457 string_list_clear(&df_sorted_entries, 0);
458 }
459
460 struct rename {
461 struct diff_filepair *pair;
462 struct stage_data *src_entry;
463 struct stage_data *dst_entry;
464 unsigned processed:1;
465 };
466
467 /*
468 * Get information of all renames which occurred between 'o_tree' and
469 * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
470 * 'b_tree') to be able to associate the correct cache entries with
471 * the rename information. 'tree' is always equal to either a_tree or b_tree.
472 */
473 static struct string_list *get_renames(struct merge_options *o,
474 struct tree *tree,
475 struct tree *o_tree,
476 struct tree *a_tree,
477 struct tree *b_tree,
478 struct string_list *entries)
479 {
480 int i;
481 struct string_list *renames;
482 struct diff_options opts;
483
484 renames = xcalloc(1, sizeof(struct string_list));
485 diff_setup(&opts);
486 DIFF_OPT_SET(&opts, RECURSIVE);
487 DIFF_OPT_CLR(&opts, RENAME_EMPTY);
488 opts.detect_rename = DIFF_DETECT_RENAME;
489 opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
490 o->diff_rename_limit >= 0 ? o->diff_rename_limit :
491 1000;
492 opts.rename_score = o->rename_score;
493 opts.show_rename_progress = o->show_rename_progress;
494 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
495 diff_setup_done(&opts);
496 diff_tree_sha1(get_object_hash(o_tree->object), get_object_hash(tree->object), "", &opts);
497 diffcore_std(&opts);
498 if (opts.needed_rename_limit > o->needed_rename_limit)
499 o->needed_rename_limit = opts.needed_rename_limit;
500 for (i = 0; i < diff_queued_diff.nr; ++i) {
501 struct string_list_item *item;
502 struct rename *re;
503 struct diff_filepair *pair = diff_queued_diff.queue[i];
504 if (pair->status != 'R') {
505 diff_free_filepair(pair);
506 continue;
507 }
508 re = xmalloc(sizeof(*re));
509 re->processed = 0;
510 re->pair = pair;
511 item = string_list_lookup(entries, re->pair->one->path);
512 if (!item)
513 re->src_entry = insert_stage_data(re->pair->one->path,
514 o_tree, a_tree, b_tree, entries);
515 else
516 re->src_entry = item->util;
517
518 item = string_list_lookup(entries, re->pair->two->path);
519 if (!item)
520 re->dst_entry = insert_stage_data(re->pair->two->path,
521 o_tree, a_tree, b_tree, entries);
522 else
523 re->dst_entry = item->util;
524 item = string_list_insert(renames, pair->one->path);
525 item->util = re;
526 }
527 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
528 diff_queued_diff.nr = 0;
529 diff_flush(&opts);
530 return renames;
531 }
532
533 static int update_stages(const char *path, const struct diff_filespec *o,
534 const struct diff_filespec *a,
535 const struct diff_filespec *b)
536 {
537
538 /*
539 * NOTE: It is usually a bad idea to call update_stages on a path
540 * before calling update_file on that same path, since it can
541 * sometimes lead to spurious "refusing to lose untracked file..."
542 * messages from update_file (via make_room_for path via
543 * would_lose_untracked). Instead, reverse the order of the calls
544 * (executing update_file first and then update_stages).
545 */
546 int clear = 1;
547 int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_SKIP_DFCHECK;
548 if (clear)
549 if (remove_file_from_cache(path))
550 return -1;
551 if (o)
552 if (add_cacheinfo(o->mode, o->sha1, path, 1, 0, options))
553 return -1;
554 if (a)
555 if (add_cacheinfo(a->mode, a->sha1, path, 2, 0, options))
556 return -1;
557 if (b)
558 if (add_cacheinfo(b->mode, b->sha1, path, 3, 0, options))
559 return -1;
560 return 0;
561 }
562
563 static void update_entry(struct stage_data *entry,
564 struct diff_filespec *o,
565 struct diff_filespec *a,
566 struct diff_filespec *b)
567 {
568 entry->processed = 0;
569 entry->stages[1].mode = o->mode;
570 entry->stages[2].mode = a->mode;
571 entry->stages[3].mode = b->mode;
572 hashcpy(entry->stages[1].sha, o->sha1);
573 hashcpy(entry->stages[2].sha, a->sha1);
574 hashcpy(entry->stages[3].sha, b->sha1);
575 }
576
577 static int remove_file(struct merge_options *o, int clean,
578 const char *path, int no_wd)
579 {
580 int update_cache = o->call_depth || clean;
581 int update_working_directory = !o->call_depth && !no_wd;
582
583 if (update_cache) {
584 if (remove_file_from_cache(path))
585 return -1;
586 }
587 if (update_working_directory) {
588 if (ignore_case) {
589 struct cache_entry *ce;
590 ce = cache_file_exists(path, strlen(path), ignore_case);
591 if (ce && ce_stage(ce) == 0)
592 return 0;
593 }
594 if (remove_path(path))
595 return -1;
596 }
597 return 0;
598 }
599
600 /* add a string to a strbuf, but converting "/" to "_" */
601 static void add_flattened_path(struct strbuf *out, const char *s)
602 {
603 size_t i = out->len;
604 strbuf_addstr(out, s);
605 for (; i < out->len; i++)
606 if (out->buf[i] == '/')
607 out->buf[i] = '_';
608 }
609
610 static char *unique_path(struct merge_options *o, const char *path, const char *branch)
611 {
612 struct strbuf newpath = STRBUF_INIT;
613 int suffix = 0;
614 size_t base_len;
615
616 strbuf_addf(&newpath, "%s~", path);
617 add_flattened_path(&newpath, branch);
618
619 base_len = newpath.len;
620 while (string_list_has_string(&o->current_file_set, newpath.buf) ||
621 string_list_has_string(&o->current_directory_set, newpath.buf) ||
622 file_exists(newpath.buf)) {
623 strbuf_setlen(&newpath, base_len);
624 strbuf_addf(&newpath, "_%d", suffix++);
625 }
626
627 string_list_insert(&o->current_file_set, newpath.buf);
628 return strbuf_detach(&newpath, NULL);
629 }
630
631 static int dir_in_way(const char *path, int check_working_copy)
632 {
633 int pos;
634 struct strbuf dirpath = STRBUF_INIT;
635 struct stat st;
636
637 strbuf_addstr(&dirpath, path);
638 strbuf_addch(&dirpath, '/');
639
640 pos = cache_name_pos(dirpath.buf, dirpath.len);
641
642 if (pos < 0)
643 pos = -1 - pos;
644 if (pos < active_nr &&
645 !strncmp(dirpath.buf, active_cache[pos]->name, dirpath.len)) {
646 strbuf_release(&dirpath);
647 return 1;
648 }
649
650 strbuf_release(&dirpath);
651 return check_working_copy && !lstat(path, &st) && S_ISDIR(st.st_mode);
652 }
653
654 static int was_tracked(const char *path)
655 {
656 int pos = cache_name_pos(path, strlen(path));
657
658 if (pos < 0)
659 pos = -1 - pos;
660 while (pos < active_nr &&
661 !strcmp(path, active_cache[pos]->name)) {
662 /*
663 * If stage #0, it is definitely tracked.
664 * If it has stage #2 then it was tracked
665 * before this merge started. All other
666 * cases the path was not tracked.
667 */
668 switch (ce_stage(active_cache[pos])) {
669 case 0:
670 case 2:
671 return 1;
672 }
673 pos++;
674 }
675 return 0;
676 }
677
678 static int would_lose_untracked(const char *path)
679 {
680 return !was_tracked(path) && file_exists(path);
681 }
682
683 static int make_room_for_path(struct merge_options *o, const char *path)
684 {
685 int status, i;
686 const char *msg = _("failed to create path '%s'%s");
687
688 /* Unlink any D/F conflict files that are in the way */
689 for (i = 0; i < o->df_conflict_file_set.nr; i++) {
690 const char *df_path = o->df_conflict_file_set.items[i].string;
691 size_t pathlen = strlen(path);
692 size_t df_pathlen = strlen(df_path);
693 if (df_pathlen < pathlen &&
694 path[df_pathlen] == '/' &&
695 strncmp(path, df_path, df_pathlen) == 0) {
696 output(o, 3,
697 _("Removing %s to make room for subdirectory\n"),
698 df_path);
699 unlink(df_path);
700 unsorted_string_list_delete_item(&o->df_conflict_file_set,
701 i, 0);
702 break;
703 }
704 }
705
706 /* Make sure leading directories are created */
707 status = safe_create_leading_directories_const(path);
708 if (status) {
709 if (status == SCLD_EXISTS) {
710 /* something else exists */
711 error(msg, path, _(": perhaps a D/F conflict?"));
712 return -1;
713 }
714 die(msg, path, "");
715 }
716
717 /*
718 * Do not unlink a file in the work tree if we are not
719 * tracking it.
720 */
721 if (would_lose_untracked(path))
722 return error(_("refusing to lose untracked file at '%s'"),
723 path);
724
725 /* Successful unlink is good.. */
726 if (!unlink(path))
727 return 0;
728 /* .. and so is no existing file */
729 if (errno == ENOENT)
730 return 0;
731 /* .. but not some other error (who really cares what?) */
732 return error(msg, path, _(": perhaps a D/F conflict?"));
733 }
734
735 static void update_file_flags(struct merge_options *o,
736 const unsigned char *sha,
737 unsigned mode,
738 const char *path,
739 int update_cache,
740 int update_wd)
741 {
742 if (o->call_depth)
743 update_wd = 0;
744
745 if (update_wd) {
746 enum object_type type;
747 void *buf;
748 unsigned long size;
749
750 if (S_ISGITLINK(mode)) {
751 /*
752 * We may later decide to recursively descend into
753 * the submodule directory and update its index
754 * and/or work tree, but we do not do that now.
755 */
756 update_wd = 0;
757 goto update_index;
758 }
759
760 buf = read_sha1_file(sha, &type, &size);
761 if (!buf)
762 die(_("cannot read object %s '%s'"), sha1_to_hex(sha), path);
763 if (type != OBJ_BLOB)
764 die(_("blob expected for %s '%s'"), sha1_to_hex(sha), path);
765 if (S_ISREG(mode)) {
766 struct strbuf strbuf = STRBUF_INIT;
767 if (convert_to_working_tree(path, buf, size, &strbuf)) {
768 free(buf);
769 size = strbuf.len;
770 buf = strbuf_detach(&strbuf, NULL);
771 }
772 }
773
774 if (make_room_for_path(o, path) < 0) {
775 update_wd = 0;
776 free(buf);
777 goto update_index;
778 }
779 if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
780 int fd;
781 if (mode & 0100)
782 mode = 0777;
783 else
784 mode = 0666;
785 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
786 if (fd < 0)
787 die_errno(_("failed to open '%s'"), path);
788 write_in_full(fd, buf, size);
789 close(fd);
790 } else if (S_ISLNK(mode)) {
791 char *lnk = xmemdupz(buf, size);
792 safe_create_leading_directories_const(path);
793 unlink(path);
794 if (symlink(lnk, path))
795 die_errno(_("failed to symlink '%s'"), path);
796 free(lnk);
797 } else
798 die(_("do not know what to do with %06o %s '%s'"),
799 mode, sha1_to_hex(sha), path);
800 free(buf);
801 }
802 update_index:
803 if (update_cache)
804 add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
805 }
806
807 static void update_file(struct merge_options *o,
808 int clean,
809 const unsigned char *sha,
810 unsigned mode,
811 const char *path)
812 {
813 update_file_flags(o, sha, mode, path, o->call_depth || clean, !o->call_depth);
814 }
815
816 /* Low level file merging, update and removal */
817
818 struct merge_file_info {
819 unsigned char sha[20];
820 unsigned mode;
821 unsigned clean:1,
822 merge:1;
823 };
824
825 static int merge_3way(struct merge_options *o,
826 mmbuffer_t *result_buf,
827 const struct diff_filespec *one,
828 const struct diff_filespec *a,
829 const struct diff_filespec *b,
830 const char *branch1,
831 const char *branch2)
832 {
833 mmfile_t orig, src1, src2;
834 struct ll_merge_options ll_opts = {0};
835 char *base_name, *name1, *name2;
836 int merge_status;
837
838 ll_opts.renormalize = o->renormalize;
839 ll_opts.xdl_opts = o->xdl_opts;
840
841 if (o->call_depth) {
842 ll_opts.virtual_ancestor = 1;
843 ll_opts.variant = 0;
844 } else {
845 switch (o->recursive_variant) {
846 case MERGE_RECURSIVE_OURS:
847 ll_opts.variant = XDL_MERGE_FAVOR_OURS;
848 break;
849 case MERGE_RECURSIVE_THEIRS:
850 ll_opts.variant = XDL_MERGE_FAVOR_THEIRS;
851 break;
852 default:
853 ll_opts.variant = 0;
854 break;
855 }
856 }
857
858 if (strcmp(a->path, b->path) ||
859 (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) {
860 base_name = o->ancestor == NULL ? NULL :
861 mkpathdup("%s:%s", o->ancestor, one->path);
862 name1 = mkpathdup("%s:%s", branch1, a->path);
863 name2 = mkpathdup("%s:%s", branch2, b->path);
864 } else {
865 base_name = o->ancestor == NULL ? NULL :
866 mkpathdup("%s", o->ancestor);
867 name1 = mkpathdup("%s", branch1);
868 name2 = mkpathdup("%s", branch2);
869 }
870
871 read_mmblob(&orig, one->sha1);
872 read_mmblob(&src1, a->sha1);
873 read_mmblob(&src2, b->sha1);
874
875 merge_status = ll_merge(result_buf, a->path, &orig, base_name,
876 &src1, name1, &src2, name2, &ll_opts);
877
878 free(base_name);
879 free(name1);
880 free(name2);
881 free(orig.ptr);
882 free(src1.ptr);
883 free(src2.ptr);
884 return merge_status;
885 }
886
887 static struct merge_file_info merge_file_1(struct merge_options *o,
888 const struct diff_filespec *one,
889 const struct diff_filespec *a,
890 const struct diff_filespec *b,
891 const char *branch1,
892 const char *branch2)
893 {
894 struct merge_file_info result;
895 result.merge = 0;
896 result.clean = 1;
897
898 if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) {
899 result.clean = 0;
900 if (S_ISREG(a->mode)) {
901 result.mode = a->mode;
902 hashcpy(result.sha, a->sha1);
903 } else {
904 result.mode = b->mode;
905 hashcpy(result.sha, b->sha1);
906 }
907 } else {
908 if (!sha_eq(a->sha1, one->sha1) && !sha_eq(b->sha1, one->sha1))
909 result.merge = 1;
910
911 /*
912 * Merge modes
913 */
914 if (a->mode == b->mode || a->mode == one->mode)
915 result.mode = b->mode;
916 else {
917 result.mode = a->mode;
918 if (b->mode != one->mode) {
919 result.clean = 0;
920 result.merge = 1;
921 }
922 }
923
924 if (sha_eq(a->sha1, b->sha1) || sha_eq(a->sha1, one->sha1))
925 hashcpy(result.sha, b->sha1);
926 else if (sha_eq(b->sha1, one->sha1))
927 hashcpy(result.sha, a->sha1);
928 else if (S_ISREG(a->mode)) {
929 mmbuffer_t result_buf;
930 int merge_status;
931
932 merge_status = merge_3way(o, &result_buf, one, a, b,
933 branch1, branch2);
934
935 if ((merge_status < 0) || !result_buf.ptr)
936 die(_("Failed to execute internal merge"));
937
938 if (write_sha1_file(result_buf.ptr, result_buf.size,
939 blob_type, result.sha))
940 die(_("Unable to add %s to database"),
941 a->path);
942
943 free(result_buf.ptr);
944 result.clean = (merge_status == 0);
945 } else if (S_ISGITLINK(a->mode)) {
946 result.clean = merge_submodule(result.sha,
947 one->path, one->sha1,
948 a->sha1, b->sha1,
949 !o->call_depth);
950 } else if (S_ISLNK(a->mode)) {
951 hashcpy(result.sha, a->sha1);
952
953 if (!sha_eq(a->sha1, b->sha1))
954 result.clean = 0;
955 } else {
956 die(_("unsupported object type in the tree"));
957 }
958 }
959
960 return result;
961 }
962
963 static struct merge_file_info
964 merge_file_special_markers(struct merge_options *o,
965 const struct diff_filespec *one,
966 const struct diff_filespec *a,
967 const struct diff_filespec *b,
968 const char *branch1,
969 const char *filename1,
970 const char *branch2,
971 const char *filename2)
972 {
973 char *side1 = NULL;
974 char *side2 = NULL;
975 struct merge_file_info mfi;
976
977 if (filename1)
978 side1 = xstrfmt("%s:%s", branch1, filename1);
979 if (filename2)
980 side2 = xstrfmt("%s:%s", branch2, filename2);
981
982 mfi = merge_file_1(o, one, a, b,
983 side1 ? side1 : branch1, side2 ? side2 : branch2);
984 free(side1);
985 free(side2);
986 return mfi;
987 }
988
989 static struct merge_file_info merge_file_one(struct merge_options *o,
990 const char *path,
991 const unsigned char *o_sha, int o_mode,
992 const unsigned char *a_sha, int a_mode,
993 const unsigned char *b_sha, int b_mode,
994 const char *branch1,
995 const char *branch2)
996 {
997 struct diff_filespec one, a, b;
998
999 one.path = a.path = b.path = (char *)path;
1000 hashcpy(one.sha1, o_sha);
1001 one.mode = o_mode;
1002 hashcpy(a.sha1, a_sha);
1003 a.mode = a_mode;
1004 hashcpy(b.sha1, b_sha);
1005 b.mode = b_mode;
1006 return merge_file_1(o, &one, &a, &b, branch1, branch2);
1007 }
1008
1009 static void handle_change_delete(struct merge_options *o,
1010 const char *path,
1011 const unsigned char *o_sha, int o_mode,
1012 const unsigned char *a_sha, int a_mode,
1013 const unsigned char *b_sha, int b_mode,
1014 const char *change, const char *change_past)
1015 {
1016 char *renamed = NULL;
1017 if (dir_in_way(path, !o->call_depth)) {
1018 renamed = unique_path(o, path, a_sha ? o->branch1 : o->branch2);
1019 }
1020
1021 if (o->call_depth) {
1022 /*
1023 * We cannot arbitrarily accept either a_sha or b_sha as
1024 * correct; since there is no true "middle point" between
1025 * them, simply reuse the base version for virtual merge base.
1026 */
1027 remove_file_from_cache(path);
1028 update_file(o, 0, o_sha, o_mode, renamed ? renamed : path);
1029 } else if (!a_sha) {
1030 if (!renamed) {
1031 output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1032 "and %s in %s. Version %s of %s left in tree."),
1033 change, path, o->branch1, change_past,
1034 o->branch2, o->branch2, path);
1035 update_file(o, 0, b_sha, b_mode, path);
1036 } else {
1037 output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1038 "and %s in %s. Version %s of %s left in tree at %s."),
1039 change, path, o->branch1, change_past,
1040 o->branch2, o->branch2, path, renamed);
1041 update_file(o, 0, b_sha, b_mode, renamed);
1042 }
1043 } else {
1044 if (!renamed) {
1045 output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1046 "and %s in %s. Version %s of %s left in tree."),
1047 change, path, o->branch2, change_past,
1048 o->branch1, o->branch1, path);
1049 } else {
1050 output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1051 "and %s in %s. Version %s of %s left in tree at %s."),
1052 change, path, o->branch2, change_past,
1053 o->branch1, o->branch1, path, renamed);
1054 update_file(o, 0, a_sha, a_mode, renamed);
1055 }
1056 /*
1057 * No need to call update_file() on path when !renamed, since
1058 * that would needlessly touch path. We could call
1059 * update_file_flags() with update_cache=0 and update_wd=0,
1060 * but that's a no-op.
1061 */
1062 }
1063 free(renamed);
1064 }
1065
1066 static void conflict_rename_delete(struct merge_options *o,
1067 struct diff_filepair *pair,
1068 const char *rename_branch,
1069 const char *other_branch)
1070 {
1071 const struct diff_filespec *orig = pair->one;
1072 const struct diff_filespec *dest = pair->two;
1073 const unsigned char *a_sha = NULL;
1074 const unsigned char *b_sha = NULL;
1075 int a_mode = 0;
1076 int b_mode = 0;
1077
1078 if (rename_branch == o->branch1) {
1079 a_sha = dest->sha1;
1080 a_mode = dest->mode;
1081 } else {
1082 b_sha = dest->sha1;
1083 b_mode = dest->mode;
1084 }
1085
1086 handle_change_delete(o,
1087 o->call_depth ? orig->path : dest->path,
1088 orig->sha1, orig->mode,
1089 a_sha, a_mode,
1090 b_sha, b_mode,
1091 _("rename"), _("renamed"));
1092
1093 if (o->call_depth) {
1094 remove_file_from_cache(dest->path);
1095 } else {
1096 update_stages(dest->path, NULL,
1097 rename_branch == o->branch1 ? dest : NULL,
1098 rename_branch == o->branch1 ? NULL : dest);
1099 }
1100
1101 }
1102
1103 static struct diff_filespec *filespec_from_entry(struct diff_filespec *target,
1104 struct stage_data *entry,
1105 int stage)
1106 {
1107 unsigned char *sha = entry->stages[stage].sha;
1108 unsigned mode = entry->stages[stage].mode;
1109 if (mode == 0 || is_null_sha1(sha))
1110 return NULL;
1111 hashcpy(target->sha1, sha);
1112 target->mode = mode;
1113 return target;
1114 }
1115
1116 static void handle_file(struct merge_options *o,
1117 struct diff_filespec *rename,
1118 int stage,
1119 struct rename_conflict_info *ci)
1120 {
1121 char *dst_name = rename->path;
1122 struct stage_data *dst_entry;
1123 const char *cur_branch, *other_branch;
1124 struct diff_filespec other;
1125 struct diff_filespec *add;
1126
1127 if (stage == 2) {
1128 dst_entry = ci->dst_entry1;
1129 cur_branch = ci->branch1;
1130 other_branch = ci->branch2;
1131 } else {
1132 dst_entry = ci->dst_entry2;
1133 cur_branch = ci->branch2;
1134 other_branch = ci->branch1;
1135 }
1136
1137 add = filespec_from_entry(&other, dst_entry, stage ^ 1);
1138 if (add) {
1139 char *add_name = unique_path(o, rename->path, other_branch);
1140 update_file(o, 0, add->sha1, add->mode, add_name);
1141
1142 remove_file(o, 0, rename->path, 0);
1143 dst_name = unique_path(o, rename->path, cur_branch);
1144 } else {
1145 if (dir_in_way(rename->path, !o->call_depth)) {
1146 dst_name = unique_path(o, rename->path, cur_branch);
1147 output(o, 1, _("%s is a directory in %s adding as %s instead"),
1148 rename->path, other_branch, dst_name);
1149 }
1150 }
1151 update_file(o, 0, rename->sha1, rename->mode, dst_name);
1152 if (stage == 2)
1153 update_stages(rename->path, NULL, rename, add);
1154 else
1155 update_stages(rename->path, NULL, add, rename);
1156
1157 if (dst_name != rename->path)
1158 free(dst_name);
1159 }
1160
1161 static void conflict_rename_rename_1to2(struct merge_options *o,
1162 struct rename_conflict_info *ci)
1163 {
1164 /* One file was renamed in both branches, but to different names. */
1165 struct diff_filespec *one = ci->pair1->one;
1166 struct diff_filespec *a = ci->pair1->two;
1167 struct diff_filespec *b = ci->pair2->two;
1168
1169 output(o, 1, _("CONFLICT (rename/rename): "
1170 "Rename \"%s\"->\"%s\" in branch \"%s\" "
1171 "rename \"%s\"->\"%s\" in \"%s\"%s"),
1172 one->path, a->path, ci->branch1,
1173 one->path, b->path, ci->branch2,
1174 o->call_depth ? _(" (left unresolved)") : "");
1175 if (o->call_depth) {
1176 struct merge_file_info mfi;
1177 struct diff_filespec other;
1178 struct diff_filespec *add;
1179 mfi = merge_file_one(o, one->path,
1180 one->sha1, one->mode,
1181 a->sha1, a->mode,
1182 b->sha1, b->mode,
1183 ci->branch1, ci->branch2);
1184 /*
1185 * FIXME: For rename/add-source conflicts (if we could detect
1186 * such), this is wrong. We should instead find a unique
1187 * pathname and then either rename the add-source file to that
1188 * unique path, or use that unique path instead of src here.
1189 */
1190 update_file(o, 0, mfi.sha, mfi.mode, one->path);
1191
1192 /*
1193 * Above, we put the merged content at the merge-base's
1194 * path. Now we usually need to delete both a->path and
1195 * b->path. However, the rename on each side of the merge
1196 * could also be involved in a rename/add conflict. In
1197 * such cases, we should keep the added file around,
1198 * resolving the conflict at that path in its favor.
1199 */
1200 add = filespec_from_entry(&other, ci->dst_entry1, 2 ^ 1);
1201 if (add)
1202 update_file(o, 0, add->sha1, add->mode, a->path);
1203 else
1204 remove_file_from_cache(a->path);
1205 add = filespec_from_entry(&other, ci->dst_entry2, 3 ^ 1);
1206 if (add)
1207 update_file(o, 0, add->sha1, add->mode, b->path);
1208 else
1209 remove_file_from_cache(b->path);
1210 } else {
1211 handle_file(o, a, 2, ci);
1212 handle_file(o, b, 3, ci);
1213 }
1214 }
1215
1216 static void conflict_rename_rename_2to1(struct merge_options *o,
1217 struct rename_conflict_info *ci)
1218 {
1219 /* Two files, a & b, were renamed to the same thing, c. */
1220 struct diff_filespec *a = ci->pair1->one;
1221 struct diff_filespec *b = ci->pair2->one;
1222 struct diff_filespec *c1 = ci->pair1->two;
1223 struct diff_filespec *c2 = ci->pair2->two;
1224 char *path = c1->path; /* == c2->path */
1225 struct merge_file_info mfi_c1;
1226 struct merge_file_info mfi_c2;
1227
1228 output(o, 1, _("CONFLICT (rename/rename): "
1229 "Rename %s->%s in %s. "
1230 "Rename %s->%s in %s"),
1231 a->path, c1->path, ci->branch1,
1232 b->path, c2->path, ci->branch2);
1233
1234 remove_file(o, 1, a->path, would_lose_untracked(a->path));
1235 remove_file(o, 1, b->path, would_lose_untracked(b->path));
1236
1237 mfi_c1 = merge_file_special_markers(o, a, c1, &ci->ren1_other,
1238 o->branch1, c1->path,
1239 o->branch2, ci->ren1_other.path);
1240 mfi_c2 = merge_file_special_markers(o, b, &ci->ren2_other, c2,
1241 o->branch1, ci->ren2_other.path,
1242 o->branch2, c2->path);
1243
1244 if (o->call_depth) {
1245 /*
1246 * If mfi_c1.clean && mfi_c2.clean, then it might make
1247 * sense to do a two-way merge of those results. But, I
1248 * think in all cases, it makes sense to have the virtual
1249 * merge base just undo the renames; they can be detected
1250 * again later for the non-recursive merge.
1251 */
1252 remove_file(o, 0, path, 0);
1253 update_file(o, 0, mfi_c1.sha, mfi_c1.mode, a->path);
1254 update_file(o, 0, mfi_c2.sha, mfi_c2.mode, b->path);
1255 } else {
1256 char *new_path1 = unique_path(o, path, ci->branch1);
1257 char *new_path2 = unique_path(o, path, ci->branch2);
1258 output(o, 1, _("Renaming %s to %s and %s to %s instead"),
1259 a->path, new_path1, b->path, new_path2);
1260 remove_file(o, 0, path, 0);
1261 update_file(o, 0, mfi_c1.sha, mfi_c1.mode, new_path1);
1262 update_file(o, 0, mfi_c2.sha, mfi_c2.mode, new_path2);
1263 free(new_path2);
1264 free(new_path1);
1265 }
1266 }
1267
1268 static int process_renames(struct merge_options *o,
1269 struct string_list *a_renames,
1270 struct string_list *b_renames)
1271 {
1272 int clean_merge = 1, i, j;
1273 struct string_list a_by_dst = STRING_LIST_INIT_NODUP;
1274 struct string_list b_by_dst = STRING_LIST_INIT_NODUP;
1275 const struct rename *sre;
1276
1277 for (i = 0; i < a_renames->nr; i++) {
1278 sre = a_renames->items[i].util;
1279 string_list_insert(&a_by_dst, sre->pair->two->path)->util
1280 = (void *)sre;
1281 }
1282 for (i = 0; i < b_renames->nr; i++) {
1283 sre = b_renames->items[i].util;
1284 string_list_insert(&b_by_dst, sre->pair->two->path)->util
1285 = (void *)sre;
1286 }
1287
1288 for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
1289 struct string_list *renames1, *renames2Dst;
1290 struct rename *ren1 = NULL, *ren2 = NULL;
1291 const char *branch1, *branch2;
1292 const char *ren1_src, *ren1_dst;
1293 struct string_list_item *lookup;
1294
1295 if (i >= a_renames->nr) {
1296 ren2 = b_renames->items[j++].util;
1297 } else if (j >= b_renames->nr) {
1298 ren1 = a_renames->items[i++].util;
1299 } else {
1300 int compare = strcmp(a_renames->items[i].string,
1301 b_renames->items[j].string);
1302 if (compare <= 0)
1303 ren1 = a_renames->items[i++].util;
1304 if (compare >= 0)
1305 ren2 = b_renames->items[j++].util;
1306 }
1307
1308 /* TODO: refactor, so that 1/2 are not needed */
1309 if (ren1) {
1310 renames1 = a_renames;
1311 renames2Dst = &b_by_dst;
1312 branch1 = o->branch1;
1313 branch2 = o->branch2;
1314 } else {
1315 struct rename *tmp;
1316 renames1 = b_renames;
1317 renames2Dst = &a_by_dst;
1318 branch1 = o->branch2;
1319 branch2 = o->branch1;
1320 tmp = ren2;
1321 ren2 = ren1;
1322 ren1 = tmp;
1323 }
1324
1325 if (ren1->processed)
1326 continue;
1327 ren1->processed = 1;
1328 ren1->dst_entry->processed = 1;
1329 /* BUG: We should only mark src_entry as processed if we
1330 * are not dealing with a rename + add-source case.
1331 */
1332 ren1->src_entry->processed = 1;
1333
1334 ren1_src = ren1->pair->one->path;
1335 ren1_dst = ren1->pair->two->path;
1336
1337 if (ren2) {
1338 /* One file renamed on both sides */
1339 const char *ren2_src = ren2->pair->one->path;
1340 const char *ren2_dst = ren2->pair->two->path;
1341 enum rename_type rename_type;
1342 if (strcmp(ren1_src, ren2_src) != 0)
1343 die("ren1_src != ren2_src");
1344 ren2->dst_entry->processed = 1;
1345 ren2->processed = 1;
1346 if (strcmp(ren1_dst, ren2_dst) != 0) {
1347 rename_type = RENAME_ONE_FILE_TO_TWO;
1348 clean_merge = 0;
1349 } else {
1350 rename_type = RENAME_ONE_FILE_TO_ONE;
1351 /* BUG: We should only remove ren1_src in
1352 * the base stage (think of rename +
1353 * add-source cases).
1354 */
1355 remove_file(o, 1, ren1_src, 1);
1356 update_entry(ren1->dst_entry,
1357 ren1->pair->one,
1358 ren1->pair->two,
1359 ren2->pair->two);
1360 }
1361 setup_rename_conflict_info(rename_type,
1362 ren1->pair,
1363 ren2->pair,
1364 branch1,
1365 branch2,
1366 ren1->dst_entry,
1367 ren2->dst_entry,
1368 o,
1369 NULL,
1370 NULL);
1371 } else if ((lookup = string_list_lookup(renames2Dst, ren1_dst))) {
1372 /* Two different files renamed to the same thing */
1373 char *ren2_dst;
1374 ren2 = lookup->util;
1375 ren2_dst = ren2->pair->two->path;
1376 if (strcmp(ren1_dst, ren2_dst) != 0)
1377 die("ren1_dst != ren2_dst");
1378
1379 clean_merge = 0;
1380 ren2->processed = 1;
1381 /*
1382 * BUG: We should only mark src_entry as processed
1383 * if we are not dealing with a rename + add-source
1384 * case.
1385 */
1386 ren2->src_entry->processed = 1;
1387
1388 setup_rename_conflict_info(RENAME_TWO_FILES_TO_ONE,
1389 ren1->pair,
1390 ren2->pair,
1391 branch1,
1392 branch2,
1393 ren1->dst_entry,
1394 ren2->dst_entry,
1395 o,
1396 ren1->src_entry,
1397 ren2->src_entry);
1398
1399 } else {
1400 /* Renamed in 1, maybe changed in 2 */
1401 /* we only use sha1 and mode of these */
1402 struct diff_filespec src_other, dst_other;
1403 int try_merge;
1404
1405 /*
1406 * unpack_trees loads entries from common-commit
1407 * into stage 1, from head-commit into stage 2, and
1408 * from merge-commit into stage 3. We keep track
1409 * of which side corresponds to the rename.
1410 */
1411 int renamed_stage = a_renames == renames1 ? 2 : 3;
1412 int other_stage = a_renames == renames1 ? 3 : 2;
1413
1414 /* BUG: We should only remove ren1_src in the base
1415 * stage and in other_stage (think of rename +
1416 * add-source case).
1417 */
1418 remove_file(o, 1, ren1_src,
1419 renamed_stage == 2 || !was_tracked(ren1_src));
1420
1421 hashcpy(src_other.sha1, ren1->src_entry->stages[other_stage].sha);
1422 src_other.mode = ren1->src_entry->stages[other_stage].mode;
1423 hashcpy(dst_other.sha1, ren1->dst_entry->stages[other_stage].sha);
1424 dst_other.mode = ren1->dst_entry->stages[other_stage].mode;
1425 try_merge = 0;
1426
1427 if (sha_eq(src_other.sha1, null_sha1)) {
1428 setup_rename_conflict_info(RENAME_DELETE,
1429 ren1->pair,
1430 NULL,
1431 branch1,
1432 branch2,
1433 ren1->dst_entry,
1434 NULL,
1435 o,
1436 NULL,
1437 NULL);
1438 } else if ((dst_other.mode == ren1->pair->two->mode) &&
1439 sha_eq(dst_other.sha1, ren1->pair->two->sha1)) {
1440 /*
1441 * Added file on the other side identical to
1442 * the file being renamed: clean merge.
1443 * Also, there is no need to overwrite the
1444 * file already in the working copy, so call
1445 * update_file_flags() instead of
1446 * update_file().
1447 */
1448 update_file_flags(o,
1449 ren1->pair->two->sha1,
1450 ren1->pair->two->mode,
1451 ren1_dst,
1452 1, /* update_cache */
1453 0 /* update_wd */);
1454 } else if (!sha_eq(dst_other.sha1, null_sha1)) {
1455 clean_merge = 0;
1456 try_merge = 1;
1457 output(o, 1, _("CONFLICT (rename/add): Rename %s->%s in %s. "
1458 "%s added in %s"),
1459 ren1_src, ren1_dst, branch1,
1460 ren1_dst, branch2);
1461 if (o->call_depth) {
1462 struct merge_file_info mfi;
1463 mfi = merge_file_one(o, ren1_dst, null_sha1, 0,
1464 ren1->pair->two->sha1, ren1->pair->two->mode,
1465 dst_other.sha1, dst_other.mode,
1466 branch1, branch2);
1467 output(o, 1, _("Adding merged %s"), ren1_dst);
1468 update_file(o, 0, mfi.sha, mfi.mode, ren1_dst);
1469 try_merge = 0;
1470 } else {
1471 char *new_path = unique_path(o, ren1_dst, branch2);
1472 output(o, 1, _("Adding as %s instead"), new_path);
1473 update_file(o, 0, dst_other.sha1, dst_other.mode, new_path);
1474 free(new_path);
1475 }
1476 } else
1477 try_merge = 1;
1478
1479 if (try_merge) {
1480 struct diff_filespec *one, *a, *b;
1481 src_other.path = (char *)ren1_src;
1482
1483 one = ren1->pair->one;
1484 if (a_renames == renames1) {
1485 a = ren1->pair->two;
1486 b = &src_other;
1487 } else {
1488 b = ren1->pair->two;
1489 a = &src_other;
1490 }
1491 update_entry(ren1->dst_entry, one, a, b);
1492 setup_rename_conflict_info(RENAME_NORMAL,
1493 ren1->pair,
1494 NULL,
1495 branch1,
1496 NULL,
1497 ren1->dst_entry,
1498 NULL,
1499 o,
1500 NULL,
1501 NULL);
1502 }
1503 }
1504 }
1505 string_list_clear(&a_by_dst, 0);
1506 string_list_clear(&b_by_dst, 0);
1507
1508 return clean_merge;
1509 }
1510
1511 static unsigned char *stage_sha(const unsigned char *sha, unsigned mode)
1512 {
1513 return (is_null_sha1(sha) || mode == 0) ? NULL: (unsigned char *)sha;
1514 }
1515
1516 static int read_sha1_strbuf(const unsigned char *sha1, struct strbuf *dst)
1517 {
1518 void *buf;
1519 enum object_type type;
1520 unsigned long size;
1521 buf = read_sha1_file(sha1, &type, &size);
1522 if (!buf)
1523 return error(_("cannot read object %s"), sha1_to_hex(sha1));
1524 if (type != OBJ_BLOB) {
1525 free(buf);
1526 return error(_("object %s is not a blob"), sha1_to_hex(sha1));
1527 }
1528 strbuf_attach(dst, buf, size, size + 1);
1529 return 0;
1530 }
1531
1532 static int blob_unchanged(const unsigned char *o_sha,
1533 unsigned o_mode,
1534 const unsigned char *a_sha,
1535 unsigned a_mode,
1536 int renormalize, const char *path)
1537 {
1538 struct strbuf o = STRBUF_INIT;
1539 struct strbuf a = STRBUF_INIT;
1540 int ret = 0; /* assume changed for safety */
1541
1542 if (a_mode != o_mode)
1543 return 0;
1544 if (sha_eq(o_sha, a_sha))
1545 return 1;
1546 if (!renormalize)
1547 return 0;
1548
1549 assert(o_sha && a_sha);
1550 if (read_sha1_strbuf(o_sha, &o) || read_sha1_strbuf(a_sha, &a))
1551 goto error_return;
1552 /*
1553 * Note: binary | is used so that both renormalizations are
1554 * performed. Comparison can be skipped if both files are
1555 * unchanged since their sha1s have already been compared.
1556 */
1557 if (renormalize_buffer(path, o.buf, o.len, &o) |
1558 renormalize_buffer(path, a.buf, a.len, &a))
1559 ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len));
1560
1561 error_return:
1562 strbuf_release(&o);
1563 strbuf_release(&a);
1564 return ret;
1565 }
1566
1567 static void handle_modify_delete(struct merge_options *o,
1568 const char *path,
1569 unsigned char *o_sha, int o_mode,
1570 unsigned char *a_sha, int a_mode,
1571 unsigned char *b_sha, int b_mode)
1572 {
1573 handle_change_delete(o,
1574 path,
1575 o_sha, o_mode,
1576 a_sha, a_mode,
1577 b_sha, b_mode,
1578 _("modify"), _("modified"));
1579 }
1580
1581 static int merge_content(struct merge_options *o,
1582 const char *path,
1583 unsigned char *o_sha, int o_mode,
1584 unsigned char *a_sha, int a_mode,
1585 unsigned char *b_sha, int b_mode,
1586 struct rename_conflict_info *rename_conflict_info)
1587 {
1588 const char *reason = _("content");
1589 const char *path1 = NULL, *path2 = NULL;
1590 struct merge_file_info mfi;
1591 struct diff_filespec one, a, b;
1592 unsigned df_conflict_remains = 0;
1593
1594 if (!o_sha) {
1595 reason = _("add/add");
1596 o_sha = (unsigned char *)null_sha1;
1597 }
1598 one.path = a.path = b.path = (char *)path;
1599 hashcpy(one.sha1, o_sha);
1600 one.mode = o_mode;
1601 hashcpy(a.sha1, a_sha);
1602 a.mode = a_mode;
1603 hashcpy(b.sha1, b_sha);
1604 b.mode = b_mode;
1605
1606 if (rename_conflict_info) {
1607 struct diff_filepair *pair1 = rename_conflict_info->pair1;
1608
1609 path1 = (o->branch1 == rename_conflict_info->branch1) ?
1610 pair1->two->path : pair1->one->path;
1611 /* If rename_conflict_info->pair2 != NULL, we are in
1612 * RENAME_ONE_FILE_TO_ONE case. Otherwise, we have a
1613 * normal rename.
1614 */
1615 path2 = (rename_conflict_info->pair2 ||
1616 o->branch2 == rename_conflict_info->branch1) ?
1617 pair1->two->path : pair1->one->path;
1618
1619 if (dir_in_way(path, !o->call_depth))
1620 df_conflict_remains = 1;
1621 }
1622 mfi = merge_file_special_markers(o, &one, &a, &b,
1623 o->branch1, path1,
1624 o->branch2, path2);
1625
1626 if (mfi.clean && !df_conflict_remains &&
1627 sha_eq(mfi.sha, a_sha) && mfi.mode == a_mode) {
1628 int path_renamed_outside_HEAD;
1629 output(o, 3, _("Skipped %s (merged same as existing)"), path);
1630 /*
1631 * The content merge resulted in the same file contents we
1632 * already had. We can return early if those file contents
1633 * are recorded at the correct path (which may not be true
1634 * if the merge involves a rename).
1635 */
1636 path_renamed_outside_HEAD = !path2 || !strcmp(path, path2);
1637 if (!path_renamed_outside_HEAD) {
1638 add_cacheinfo(mfi.mode, mfi.sha, path,
1639 0, (!o->call_depth), 0);
1640 return mfi.clean;
1641 }
1642 } else
1643 output(o, 2, _("Auto-merging %s"), path);
1644
1645 if (!mfi.clean) {
1646 if (S_ISGITLINK(mfi.mode))
1647 reason = _("submodule");
1648 output(o, 1, _("CONFLICT (%s): Merge conflict in %s"),
1649 reason, path);
1650 if (rename_conflict_info && !df_conflict_remains)
1651 update_stages(path, &one, &a, &b);
1652 }
1653
1654 if (df_conflict_remains) {
1655 char *new_path;
1656 if (o->call_depth) {
1657 remove_file_from_cache(path);
1658 } else {
1659 if (!mfi.clean)
1660 update_stages(path, &one, &a, &b);
1661 else {
1662 int file_from_stage2 = was_tracked(path);
1663 struct diff_filespec merged;
1664 hashcpy(merged.sha1, mfi.sha);
1665 merged.mode = mfi.mode;
1666
1667 update_stages(path, NULL,
1668 file_from_stage2 ? &merged : NULL,
1669 file_from_stage2 ? NULL : &merged);
1670 }
1671
1672 }
1673 new_path = unique_path(o, path, rename_conflict_info->branch1);
1674 output(o, 1, _("Adding as %s instead"), new_path);
1675 update_file(o, 0, mfi.sha, mfi.mode, new_path);
1676 free(new_path);
1677 mfi.clean = 0;
1678 } else {
1679 update_file(o, mfi.clean, mfi.sha, mfi.mode, path);
1680 }
1681 return mfi.clean;
1682
1683 }
1684
1685 /* Per entry merge function */
1686 static int process_entry(struct merge_options *o,
1687 const char *path, struct stage_data *entry)
1688 {
1689 int clean_merge = 1;
1690 int normalize = o->renormalize;
1691 unsigned o_mode = entry->stages[1].mode;
1692 unsigned a_mode = entry->stages[2].mode;
1693 unsigned b_mode = entry->stages[3].mode;
1694 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1695 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1696 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1697
1698 entry->processed = 1;
1699 if (entry->rename_conflict_info) {
1700 struct rename_conflict_info *conflict_info = entry->rename_conflict_info;
1701 switch (conflict_info->rename_type) {
1702 case RENAME_NORMAL:
1703 case RENAME_ONE_FILE_TO_ONE:
1704 clean_merge = merge_content(o, path,
1705 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1706 conflict_info);
1707 break;
1708 case RENAME_DELETE:
1709 clean_merge = 0;
1710 conflict_rename_delete(o, conflict_info->pair1,
1711 conflict_info->branch1,
1712 conflict_info->branch2);
1713 break;
1714 case RENAME_ONE_FILE_TO_TWO:
1715 clean_merge = 0;
1716 conflict_rename_rename_1to2(o, conflict_info);
1717 break;
1718 case RENAME_TWO_FILES_TO_ONE:
1719 clean_merge = 0;
1720 conflict_rename_rename_2to1(o, conflict_info);
1721 break;
1722 default:
1723 entry->processed = 0;
1724 break;
1725 }
1726 } else if (o_sha && (!a_sha || !b_sha)) {
1727 /* Case A: Deleted in one */
1728 if ((!a_sha && !b_sha) ||
1729 (!b_sha && blob_unchanged(o_sha, o_mode, a_sha, a_mode, normalize, path)) ||
1730 (!a_sha && blob_unchanged(o_sha, o_mode, b_sha, b_mode, normalize, path))) {
1731 /* Deleted in both or deleted in one and
1732 * unchanged in the other */
1733 if (a_sha)
1734 output(o, 2, _("Removing %s"), path);
1735 /* do not touch working file if it did not exist */
1736 remove_file(o, 1, path, !a_sha);
1737 } else {
1738 /* Modify/delete; deleted side may have put a directory in the way */
1739 clean_merge = 0;
1740 handle_modify_delete(o, path, o_sha, o_mode,
1741 a_sha, a_mode, b_sha, b_mode);
1742 }
1743 } else if ((!o_sha && a_sha && !b_sha) ||
1744 (!o_sha && !a_sha && b_sha)) {
1745 /* Case B: Added in one. */
1746 /* [nothing|directory] -> ([nothing|directory], file) */
1747
1748 const char *add_branch;
1749 const char *other_branch;
1750 unsigned mode;
1751 const unsigned char *sha;
1752 const char *conf;
1753
1754 if (a_sha) {
1755 add_branch = o->branch1;
1756 other_branch = o->branch2;
1757 mode = a_mode;
1758 sha = a_sha;
1759 conf = _("file/directory");
1760 } else {
1761 add_branch = o->branch2;
1762 other_branch = o->branch1;
1763 mode = b_mode;
1764 sha = b_sha;
1765 conf = _("directory/file");
1766 }
1767 if (dir_in_way(path, !o->call_depth)) {
1768 char *new_path = unique_path(o, path, add_branch);
1769 clean_merge = 0;
1770 output(o, 1, _("CONFLICT (%s): There is a directory with name %s in %s. "
1771 "Adding %s as %s"),
1772 conf, path, other_branch, path, new_path);
1773 if (o->call_depth)
1774 remove_file_from_cache(path);
1775 update_file(o, 0, sha, mode, new_path);
1776 if (o->call_depth)
1777 remove_file_from_cache(path);
1778 free(new_path);
1779 } else {
1780 output(o, 2, _("Adding %s"), path);
1781 /* do not overwrite file if already present */
1782 update_file_flags(o, sha, mode, path, 1, !a_sha);
1783 }
1784 } else if (a_sha && b_sha) {
1785 /* Case C: Added in both (check for same permissions) and */
1786 /* case D: Modified in both, but differently. */
1787 clean_merge = merge_content(o, path,
1788 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1789 NULL);
1790 } else if (!o_sha && !a_sha && !b_sha) {
1791 /*
1792 * this entry was deleted altogether. a_mode == 0 means
1793 * we had that path and want to actively remove it.
1794 */
1795 remove_file(o, 1, path, !a_mode);
1796 } else
1797 die(_("Fatal merge failure, shouldn't happen."));
1798
1799 return clean_merge;
1800 }
1801
1802 int merge_trees(struct merge_options *o,
1803 struct tree *head,
1804 struct tree *merge,
1805 struct tree *common,
1806 struct tree **result)
1807 {
1808 int code, clean;
1809
1810 if (o->subtree_shift) {
1811 merge = shift_tree_object(head, merge, o->subtree_shift);
1812 common = shift_tree_object(head, common, o->subtree_shift);
1813 }
1814
1815 if (sha_eq(get_object_hash(common->object), get_object_hash(merge->object))) {
1816 output(o, 0, _("Already up-to-date!"));
1817 *result = head;
1818 return 1;
1819 }
1820
1821 code = git_merge_trees(o->call_depth, common, head, merge);
1822
1823 if (code != 0) {
1824 if (show(o, 4) || o->call_depth)
1825 die(_("merging of trees %s and %s failed"),
1826 oid_to_hex(&head->object.oid),
1827 oid_to_hex(&merge->object.oid));
1828 else
1829 exit(128);
1830 }
1831
1832 if (unmerged_cache()) {
1833 struct string_list *entries, *re_head, *re_merge;
1834 int i;
1835 string_list_clear(&o->current_file_set, 1);
1836 string_list_clear(&o->current_directory_set, 1);
1837 get_files_dirs(o, head);
1838 get_files_dirs(o, merge);
1839
1840 entries = get_unmerged();
1841 record_df_conflict_files(o, entries);
1842 re_head = get_renames(o, head, common, head, merge, entries);
1843 re_merge = get_renames(o, merge, common, head, merge, entries);
1844 clean = process_renames(o, re_head, re_merge);
1845 for (i = entries->nr-1; 0 <= i; i--) {
1846 const char *path = entries->items[i].string;
1847 struct stage_data *e = entries->items[i].util;
1848 if (!e->processed
1849 && !process_entry(o, path, e))
1850 clean = 0;
1851 }
1852 for (i = 0; i < entries->nr; i++) {
1853 struct stage_data *e = entries->items[i].util;
1854 if (!e->processed)
1855 die(_("Unprocessed path??? %s"),
1856 entries->items[i].string);
1857 }
1858
1859 string_list_clear(re_merge, 0);
1860 string_list_clear(re_head, 0);
1861 string_list_clear(entries, 1);
1862
1863 free(re_merge);
1864 free(re_head);
1865 free(entries);
1866 }
1867 else
1868 clean = 1;
1869
1870 if (o->call_depth)
1871 *result = write_tree_from_memory(o);
1872
1873 return clean;
1874 }
1875
1876 static struct commit_list *reverse_commit_list(struct commit_list *list)
1877 {
1878 struct commit_list *next = NULL, *current, *backup;
1879 for (current = list; current; current = backup) {
1880 backup = current->next;
1881 current->next = next;
1882 next = current;
1883 }
1884 return next;
1885 }
1886
1887 /*
1888 * Merge the commits h1 and h2, return the resulting virtual
1889 * commit object and a flag indicating the cleanness of the merge.
1890 */
1891 int merge_recursive(struct merge_options *o,
1892 struct commit *h1,
1893 struct commit *h2,
1894 struct commit_list *ca,
1895 struct commit **result)
1896 {
1897 struct commit_list *iter;
1898 struct commit *merged_common_ancestors;
1899 struct tree *mrtree = mrtree;
1900 int clean;
1901
1902 if (show(o, 4)) {
1903 output(o, 4, _("Merging:"));
1904 output_commit_title(o, h1);
1905 output_commit_title(o, h2);
1906 }
1907
1908 if (!ca) {
1909 ca = get_merge_bases(h1, h2);
1910 ca = reverse_commit_list(ca);
1911 }
1912
1913 if (show(o, 5)) {
1914 unsigned cnt = commit_list_count(ca);
1915
1916 output(o, 5, Q_("found %u common ancestor:",
1917 "found %u common ancestors:", cnt), cnt);
1918 for (iter = ca; iter; iter = iter->next)
1919 output_commit_title(o, iter->item);
1920 }
1921
1922 merged_common_ancestors = pop_commit(&ca);
1923 if (merged_common_ancestors == NULL) {
1924 /* if there is no common ancestor, use an empty tree */
1925 struct tree *tree;
1926
1927 tree = lookup_tree(EMPTY_TREE_SHA1_BIN);
1928 merged_common_ancestors = make_virtual_commit(tree, "ancestor");
1929 }
1930
1931 for (iter = ca; iter; iter = iter->next) {
1932 const char *saved_b1, *saved_b2;
1933 o->call_depth++;
1934 /*
1935 * When the merge fails, the result contains files
1936 * with conflict markers. The cleanness flag is
1937 * ignored, it was never actually used, as result of
1938 * merge_trees has always overwritten it: the committed
1939 * "conflicts" were already resolved.
1940 */
1941 discard_cache();
1942 saved_b1 = o->branch1;
1943 saved_b2 = o->branch2;
1944 o->branch1 = "Temporary merge branch 1";
1945 o->branch2 = "Temporary merge branch 2";
1946 merge_recursive(o, merged_common_ancestors, iter->item,
1947 NULL, &merged_common_ancestors);
1948 o->branch1 = saved_b1;
1949 o->branch2 = saved_b2;
1950 o->call_depth--;
1951
1952 if (!merged_common_ancestors)
1953 die(_("merge returned no commit"));
1954 }
1955
1956 discard_cache();
1957 if (!o->call_depth)
1958 read_cache();
1959
1960 o->ancestor = "merged common ancestors";
1961 clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
1962 &mrtree);
1963
1964 if (o->call_depth) {
1965 *result = make_virtual_commit(mrtree, "merged tree");
1966 commit_list_insert(h1, &(*result)->parents);
1967 commit_list_insert(h2, &(*result)->parents->next);
1968 }
1969 flush_output(o);
1970 if (show(o, 2))
1971 diff_warn_rename_limit("merge.renamelimit",
1972 o->needed_rename_limit, 0);
1973 return clean;
1974 }
1975
1976 static struct commit *get_ref(const unsigned char *sha1, const char *name)
1977 {
1978 struct object *object;
1979
1980 object = deref_tag(parse_object(sha1), name, strlen(name));
1981 if (!object)
1982 return NULL;
1983 if (object->type == OBJ_TREE)
1984 return make_virtual_commit((struct tree*)object, name);
1985 if (object->type != OBJ_COMMIT)
1986 return NULL;
1987 if (parse_commit((struct commit *)object))
1988 return NULL;
1989 return (struct commit *)object;
1990 }
1991
1992 int merge_recursive_generic(struct merge_options *o,
1993 const unsigned char *head,
1994 const unsigned char *merge,
1995 int num_base_list,
1996 const unsigned char **base_list,
1997 struct commit **result)
1998 {
1999 int clean;
2000 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
2001 struct commit *head_commit = get_ref(head, o->branch1);
2002 struct commit *next_commit = get_ref(merge, o->branch2);
2003 struct commit_list *ca = NULL;
2004
2005 if (base_list) {
2006 int i;
2007 for (i = 0; i < num_base_list; ++i) {
2008 struct commit *base;
2009 if (!(base = get_ref(base_list[i], sha1_to_hex(base_list[i]))))
2010 return error(_("Could not parse object '%s'"),
2011 sha1_to_hex(base_list[i]));
2012 commit_list_insert(base, &ca);
2013 }
2014 }
2015
2016 hold_locked_index(lock, 1);
2017 clean = merge_recursive(o, head_commit, next_commit, ca,
2018 result);
2019 if (active_cache_changed &&
2020 write_locked_index(&the_index, lock, COMMIT_LOCK))
2021 return error(_("Unable to write index."));
2022
2023 return clean ? 0 : 1;
2024 }
2025
2026 static void merge_recursive_config(struct merge_options *o)
2027 {
2028 git_config_get_int("merge.verbosity", &o->verbosity);
2029 git_config_get_int("diff.renamelimit", &o->diff_rename_limit);
2030 git_config_get_int("merge.renamelimit", &o->merge_rename_limit);
2031 git_config(git_xmerge_config, NULL);
2032 }
2033
2034 void init_merge_options(struct merge_options *o)
2035 {
2036 memset(o, 0, sizeof(struct merge_options));
2037 o->verbosity = 2;
2038 o->buffer_output = 1;
2039 o->diff_rename_limit = -1;
2040 o->merge_rename_limit = -1;
2041 o->renormalize = 0;
2042 merge_recursive_config(o);
2043 if (getenv("GIT_MERGE_VERBOSITY"))
2044 o->verbosity =
2045 strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10);
2046 if (o->verbosity >= 5)
2047 o->buffer_output = 0;
2048 strbuf_init(&o->obuf, 0);
2049 string_list_init(&o->current_file_set, 1);
2050 string_list_init(&o->current_directory_set, 1);
2051 string_list_init(&o->df_conflict_file_set, 1);
2052 }
2053
2054 int parse_merge_opt(struct merge_options *o, const char *s)
2055 {
2056 const char *arg;
2057
2058 if (!s || !*s)
2059 return -1;
2060 if (!strcmp(s, "ours"))
2061 o->recursive_variant = MERGE_RECURSIVE_OURS;
2062 else if (!strcmp(s, "theirs"))
2063 o->recursive_variant = MERGE_RECURSIVE_THEIRS;
2064 else if (!strcmp(s, "subtree"))
2065 o->subtree_shift = "";
2066 else if (skip_prefix(s, "subtree=", &arg))
2067 o->subtree_shift = arg;
2068 else if (!strcmp(s, "patience"))
2069 o->xdl_opts = DIFF_WITH_ALG(o, PATIENCE_DIFF);
2070 else if (!strcmp(s, "histogram"))
2071 o->xdl_opts = DIFF_WITH_ALG(o, HISTOGRAM_DIFF);
2072 else if (skip_prefix(s, "diff-algorithm=", &arg)) {
2073 long value = parse_algorithm_value(arg);
2074 if (value < 0)
2075 return -1;
2076 /* clear out previous settings */
2077 DIFF_XDL_CLR(o, NEED_MINIMAL);
2078 o->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
2079 o->xdl_opts |= value;
2080 }
2081 else if (!strcmp(s, "ignore-space-change"))
2082 o->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2083 else if (!strcmp(s, "ignore-all-space"))
2084 o->xdl_opts |= XDF_IGNORE_WHITESPACE;
2085 else if (!strcmp(s, "ignore-space-at-eol"))
2086 o->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2087 else if (!strcmp(s, "renormalize"))
2088 o->renormalize = 1;
2089 else if (!strcmp(s, "no-renormalize"))
2090 o->renormalize = 0;
2091 else if (skip_prefix(s, "rename-threshold=", &arg)) {
2092 if ((o->rename_score = parse_rename_score(&arg)) == -1 || *arg != 0)
2093 return -1;
2094 }
2095 else
2096 return -1;
2097 return 0;
2098 }