merge-recursive: Nuke rename/directory conflict detection
[git/git.git] / merge-recursive.c
CommitLineData
9047ebbc
MV
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 */
4c371f91 6#include "advice.h"
9047ebbc
MV
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"
9047ebbc
MV
20#include "attr.h"
21#include "merge-recursive.h"
9800c0df 22#include "dir.h"
68d03e4a 23#include "submodule.h"
9047ebbc 24
85e51b78
JH
25static struct tree *shift_tree_object(struct tree *one, struct tree *two,
26 const char *subtree_shift)
9047ebbc
MV
27{
28 unsigned char shifted[20];
29
85e51b78
JH
30 if (!*subtree_shift) {
31 shift_tree(one->object.sha1, two->object.sha1, shifted, 0);
32 } else {
33 shift_tree_by(one->object.sha1, two->object.sha1, shifted,
34 subtree_shift);
35 }
9047ebbc
MV
36 if (!hashcmp(two->object.sha1, shifted))
37 return two;
38 return lookup_tree(shifted);
39}
40
41/*
a6f63ae0 42 * A virtual commit has (const char *)commit->util set to the name.
9047ebbc
MV
43 */
44
2af202be 45static struct commit *make_virtual_commit(struct tree *tree, const char *comment)
9047ebbc
MV
46{
47 struct commit *commit = xcalloc(1, sizeof(struct commit));
9047ebbc
MV
48 commit->tree = tree;
49 commit->util = (void*)comment;
9047ebbc
MV
50 /* avoid warnings */
51 commit->object.parsed = 1;
52 return commit;
53}
54
55/*
56 * Since we use get_tree_entry(), which does not put the read object into
57 * the object pool, we cannot rely on a == b.
58 */
59static int sha_eq(const unsigned char *a, const unsigned char *b)
60{
61 if (!a && !b)
62 return 2;
63 return a && b && hashcmp(a, b) == 0;
64}
65
66/*
67 * Since we want to write the index eventually, we cannot reuse the index
68 * for these (temporary) data.
69 */
70struct stage_data
71{
72 struct
73 {
74 unsigned mode;
75 unsigned char sha[20];
76 } stages[4];
77 unsigned processed:1;
78};
79
8a2fce18 80static int show(struct merge_options *o, int v)
9047ebbc 81{
5033639c 82 return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5;
9047ebbc
MV
83}
84
c7d84924 85static void flush_output(struct merge_options *o)
9047ebbc 86{
c7d84924
MV
87 if (o->obuf.len) {
88 fputs(o->obuf.buf, stdout);
89 strbuf_reset(&o->obuf);
9047ebbc
MV
90 }
91}
92
28bea9e5 93__attribute__((format (printf, 3, 4)))
8a2fce18 94static void output(struct merge_options *o, int v, const char *fmt, ...)
9047ebbc
MV
95{
96 int len;
97 va_list ap;
98
8a2fce18 99 if (!show(o, v))
9047ebbc
MV
100 return;
101
c7d84924
MV
102 strbuf_grow(&o->obuf, o->call_depth * 2 + 2);
103 memset(o->obuf.buf + o->obuf.len, ' ', o->call_depth * 2);
104 strbuf_setlen(&o->obuf, o->obuf.len + o->call_depth * 2);
9047ebbc
MV
105
106 va_start(ap, fmt);
c7d84924 107 len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap);
9047ebbc
MV
108 va_end(ap);
109
110 if (len < 0)
111 len = 0;
c7d84924
MV
112 if (len >= strbuf_avail(&o->obuf)) {
113 strbuf_grow(&o->obuf, len + 2);
9047ebbc 114 va_start(ap, fmt);
c7d84924 115 len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap);
9047ebbc 116 va_end(ap);
c7d84924 117 if (len >= strbuf_avail(&o->obuf)) {
9047ebbc
MV
118 die("this should not happen, your snprintf is broken");
119 }
120 }
c7d84924
MV
121 strbuf_setlen(&o->obuf, o->obuf.len + len);
122 strbuf_add(&o->obuf, "\n", 1);
8a2fce18 123 if (!o->buffer_output)
c7d84924 124 flush_output(o);
9047ebbc
MV
125}
126
5033639c 127static void output_commit_title(struct merge_options *o, struct commit *commit)
9047ebbc
MV
128{
129 int i;
c7d84924 130 flush_output(o);
5033639c 131 for (i = o->call_depth; i--;)
9047ebbc
MV
132 fputs(" ", stdout);
133 if (commit->util)
134 printf("virtual %s\n", (char *)commit->util);
135 else {
136 printf("%s ", find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV));
137 if (parse_commit(commit) != 0)
138 printf("(bad commit)\n");
139 else {
49b7120e
CC
140 const char *title;
141 int len = find_commit_subject(commit->buffer, &title);
142 if (len)
143 printf("%.*s\n", len, title);
9047ebbc
MV
144 }
145 }
146}
147
148static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
149 const char *path, int stage, int refresh, int options)
150{
151 struct cache_entry *ce;
152 ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage, refresh);
153 if (!ce)
154 return error("addinfo_cache failed for path '%s'", path);
155 return add_cache_entry(ce, options);
156}
157
9047ebbc
MV
158static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree)
159{
160 parse_tree(tree);
161 init_tree_desc(desc, tree->buffer, tree->size);
162}
163
164static int git_merge_trees(int index_only,
165 struct tree *common,
166 struct tree *head,
167 struct tree *merge)
168{
169 int rc;
170 struct tree_desc t[3];
171 struct unpack_trees_options opts;
172
173 memset(&opts, 0, sizeof(opts));
174 if (index_only)
175 opts.index_only = 1;
176 else
177 opts.update = 1;
178 opts.merge = 1;
179 opts.head_idx = 2;
180 opts.fn = threeway_merge;
181 opts.src_index = &the_index;
182 opts.dst_index = &the_index;
e294030f 183 setup_unpack_trees_porcelain(&opts, "merge");
9047ebbc
MV
184
185 init_tree_desc_from_tree(t+0, common);
186 init_tree_desc_from_tree(t+1, head);
187 init_tree_desc_from_tree(t+2, merge);
188
189 rc = unpack_trees(3, t, &opts);
190 cache_tree_free(&active_cache_tree);
191 return rc;
192}
193
8a2fce18 194struct tree *write_tree_from_memory(struct merge_options *o)
9047ebbc
MV
195{
196 struct tree *result = NULL;
197
198 if (unmerged_cache()) {
199 int i;
19c6a4f8 200 fprintf(stderr, "BUG: There are unmerged index entries:\n");
9047ebbc
MV
201 for (i = 0; i < active_nr; i++) {
202 struct cache_entry *ce = active_cache[i];
203 if (ce_stage(ce))
19c6a4f8
JH
204 fprintf(stderr, "BUG: %d %.*s", ce_stage(ce),
205 (int)ce_namelen(ce), ce->name);
9047ebbc 206 }
19c6a4f8 207 die("Bug in merge-recursive.c");
9047ebbc
MV
208 }
209
210 if (!active_cache_tree)
211 active_cache_tree = cache_tree();
212
213 if (!cache_tree_fully_valid(active_cache_tree) &&
214 cache_tree_update(active_cache_tree,
215 active_cache, active_nr, 0, 0) < 0)
216 die("error building trees");
217
218 result = lookup_tree(active_cache_tree->sha1);
219
220 return result;
221}
222
223static int save_files_dirs(const unsigned char *sha1,
224 const char *base, int baselen, const char *path,
225 unsigned int mode, int stage, void *context)
226{
227 int len = strlen(path);
228 char *newpath = xmalloc(baselen + len + 1);
696ee23c
MV
229 struct merge_options *o = context;
230
9047ebbc
MV
231 memcpy(newpath, base, baselen);
232 memcpy(newpath + baselen, path, len);
233 newpath[baselen + len] = '\0';
234
235 if (S_ISDIR(mode))
78a395d3 236 string_list_insert(&o->current_directory_set, newpath);
9047ebbc 237 else
78a395d3 238 string_list_insert(&o->current_file_set, newpath);
9047ebbc
MV
239 free(newpath);
240
d3bee161 241 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
9047ebbc
MV
242}
243
696ee23c 244static int get_files_dirs(struct merge_options *o, struct tree *tree)
9047ebbc
MV
245{
246 int n;
696ee23c 247 if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs, o))
9047ebbc 248 return 0;
696ee23c 249 n = o->current_file_set.nr + o->current_directory_set.nr;
9047ebbc
MV
250 return n;
251}
252
253/*
254 * Returns an index_entry instance which doesn't have to correspond to
255 * a real cache entry in Git's index.
256 */
257static struct stage_data *insert_stage_data(const char *path,
258 struct tree *o, struct tree *a, struct tree *b,
259 struct string_list *entries)
260{
261 struct string_list_item *item;
262 struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
263 get_tree_entry(o->object.sha1, path,
264 e->stages[1].sha, &e->stages[1].mode);
265 get_tree_entry(a->object.sha1, path,
266 e->stages[2].sha, &e->stages[2].mode);
267 get_tree_entry(b->object.sha1, path,
268 e->stages[3].sha, &e->stages[3].mode);
78a395d3 269 item = string_list_insert(entries, path);
9047ebbc
MV
270 item->util = e;
271 return e;
272}
273
274/*
275 * Create a dictionary mapping file names to stage_data objects. The
276 * dictionary contains one entry for every path with a non-zero stage entry.
277 */
278static struct string_list *get_unmerged(void)
279{
280 struct string_list *unmerged = xcalloc(1, sizeof(struct string_list));
281 int i;
282
283 unmerged->strdup_strings = 1;
284
285 for (i = 0; i < active_nr; i++) {
286 struct string_list_item *item;
287 struct stage_data *e;
288 struct cache_entry *ce = active_cache[i];
289 if (!ce_stage(ce))
290 continue;
291
e8c8b713 292 item = string_list_lookup(unmerged, ce->name);
9047ebbc 293 if (!item) {
78a395d3 294 item = string_list_insert(unmerged, ce->name);
9047ebbc
MV
295 item->util = xcalloc(1, sizeof(struct stage_data));
296 }
297 e = item->util;
298 e->stages[ce_stage(ce)].mode = ce->ce_mode;
299 hashcpy(e->stages[ce_stage(ce)].sha, ce->sha1);
300 }
301
302 return unmerged;
303}
304
305struct rename
306{
307 struct diff_filepair *pair;
308 struct stage_data *src_entry;
309 struct stage_data *dst_entry;
310 unsigned processed:1;
311};
312
313/*
314 * Get information of all renames which occurred between 'o_tree' and
315 * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
316 * 'b_tree') to be able to associate the correct cache entries with
317 * the rename information. 'tree' is always equal to either a_tree or b_tree.
318 */
8a2fce18
MV
319static struct string_list *get_renames(struct merge_options *o,
320 struct tree *tree,
321 struct tree *o_tree,
322 struct tree *a_tree,
323 struct tree *b_tree,
324 struct string_list *entries)
9047ebbc
MV
325{
326 int i;
327 struct string_list *renames;
328 struct diff_options opts;
329
330 renames = xcalloc(1, sizeof(struct string_list));
331 diff_setup(&opts);
332 DIFF_OPT_SET(&opts, RECURSIVE);
333 opts.detect_rename = DIFF_DETECT_RENAME;
8a2fce18
MV
334 opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
335 o->diff_rename_limit >= 0 ? o->diff_rename_limit :
9047ebbc
MV
336 500;
337 opts.warn_on_too_large_rename = 1;
338 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
339 if (diff_setup_done(&opts) < 0)
340 die("diff setup failed");
341 diff_tree_sha1(o_tree->object.sha1, tree->object.sha1, "", &opts);
342 diffcore_std(&opts);
343 for (i = 0; i < diff_queued_diff.nr; ++i) {
344 struct string_list_item *item;
345 struct rename *re;
346 struct diff_filepair *pair = diff_queued_diff.queue[i];
347 if (pair->status != 'R') {
348 diff_free_filepair(pair);
349 continue;
350 }
351 re = xmalloc(sizeof(*re));
352 re->processed = 0;
353 re->pair = pair;
e8c8b713 354 item = string_list_lookup(entries, re->pair->one->path);
9047ebbc
MV
355 if (!item)
356 re->src_entry = insert_stage_data(re->pair->one->path,
357 o_tree, a_tree, b_tree, entries);
358 else
359 re->src_entry = item->util;
360
e8c8b713 361 item = string_list_lookup(entries, re->pair->two->path);
9047ebbc
MV
362 if (!item)
363 re->dst_entry = insert_stage_data(re->pair->two->path,
364 o_tree, a_tree, b_tree, entries);
365 else
366 re->dst_entry = item->util;
78a395d3 367 item = string_list_insert(renames, pair->one->path);
9047ebbc
MV
368 item->util = re;
369 }
370 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
371 diff_queued_diff.nr = 0;
372 diff_flush(&opts);
373 return renames;
374}
375
376static int update_stages(const char *path, struct diff_filespec *o,
377 struct diff_filespec *a, struct diff_filespec *b,
378 int clear)
379{
380 int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE;
381 if (clear)
382 if (remove_file_from_cache(path))
383 return -1;
384 if (o)
385 if (add_cacheinfo(o->mode, o->sha1, path, 1, 0, options))
386 return -1;
387 if (a)
388 if (add_cacheinfo(a->mode, a->sha1, path, 2, 0, options))
389 return -1;
390 if (b)
391 if (add_cacheinfo(b->mode, b->sha1, path, 3, 0, options))
392 return -1;
393 return 0;
394}
395
b7fa51da
MV
396static int remove_file(struct merge_options *o, int clean,
397 const char *path, int no_wd)
9047ebbc 398{
b7fa51da
MV
399 int update_cache = o->call_depth || clean;
400 int update_working_directory = !o->call_depth && !no_wd;
9047ebbc
MV
401
402 if (update_cache) {
403 if (remove_file_from_cache(path))
404 return -1;
405 }
406 if (update_working_directory) {
25755e84 407 if (remove_path(path))
9047ebbc 408 return -1;
9047ebbc
MV
409 }
410 return 0;
411}
412
696ee23c 413static char *unique_path(struct merge_options *o, const char *path, const char *branch)
9047ebbc
MV
414{
415 char *newpath = xmalloc(strlen(path) + 1 + strlen(branch) + 8 + 1);
416 int suffix = 0;
417 struct stat st;
418 char *p = newpath + strlen(path);
419 strcpy(newpath, path);
420 *(p++) = '~';
421 strcpy(p, branch);
422 for (; *p; ++p)
423 if ('/' == *p)
424 *p = '_';
696ee23c
MV
425 while (string_list_has_string(&o->current_file_set, newpath) ||
426 string_list_has_string(&o->current_directory_set, newpath) ||
9047ebbc
MV
427 lstat(newpath, &st) == 0)
428 sprintf(p, "_%d", suffix++);
429
78a395d3 430 string_list_insert(&o->current_file_set, newpath);
9047ebbc
MV
431 return newpath;
432}
433
434static void flush_buffer(int fd, const char *buf, unsigned long size)
435{
436 while (size > 0) {
437 long ret = write_in_full(fd, buf, size);
438 if (ret < 0) {
439 /* Ignore epipe */
440 if (errno == EPIPE)
441 break;
d824cbba 442 die_errno("merge-recursive");
9047ebbc
MV
443 } else if (!ret) {
444 die("merge-recursive: disk full?");
445 }
446 size -= ret;
447 buf += ret;
448 }
449}
450
60c91181
JH
451static int would_lose_untracked(const char *path)
452{
453 int pos = cache_name_pos(path, strlen(path));
454
455 if (pos < 0)
456 pos = -1 - pos;
457 while (pos < active_nr &&
458 !strcmp(path, active_cache[pos]->name)) {
459 /*
460 * If stage #0, it is definitely tracked.
461 * If it has stage #2 then it was tracked
462 * before this merge started. All other
463 * cases the path was not tracked.
464 */
465 switch (ce_stage(active_cache[pos])) {
466 case 0:
467 case 2:
468 return 0;
469 }
470 pos++;
471 }
472 return file_exists(path);
473}
474
9047ebbc
MV
475static int make_room_for_path(const char *path)
476{
477 int status;
478 const char *msg = "failed to create path '%s'%s";
479
480 status = safe_create_leading_directories_const(path);
481 if (status) {
482 if (status == -3) {
483 /* something else exists */
484 error(msg, path, ": perhaps a D/F conflict?");
485 return -1;
486 }
487 die(msg, path, "");
488 }
489
60c91181
JH
490 /*
491 * Do not unlink a file in the work tree if we are not
492 * tracking it.
493 */
494 if (would_lose_untracked(path))
495 return error("refusing to lose untracked file at '%s'",
496 path);
497
9047ebbc
MV
498 /* Successful unlink is good.. */
499 if (!unlink(path))
500 return 0;
501 /* .. and so is no existing file */
502 if (errno == ENOENT)
503 return 0;
504 /* .. but not some other error (who really cares what?) */
505 return error(msg, path, ": perhaps a D/F conflict?");
506}
507
b7fa51da
MV
508static void update_file_flags(struct merge_options *o,
509 const unsigned char *sha,
9047ebbc
MV
510 unsigned mode,
511 const char *path,
512 int update_cache,
513 int update_wd)
514{
b7fa51da 515 if (o->call_depth)
9047ebbc
MV
516 update_wd = 0;
517
518 if (update_wd) {
519 enum object_type type;
520 void *buf;
521 unsigned long size;
522
68d03e4a 523 if (S_ISGITLINK(mode)) {
0c44c943
JH
524 /*
525 * We may later decide to recursively descend into
526 * the submodule directory and update its index
527 * and/or work tree, but we do not do that now.
528 */
68d03e4a 529 update_wd = 0;
0c44c943 530 goto update_index;
68d03e4a 531 }
9047ebbc
MV
532
533 buf = read_sha1_file(sha, &type, &size);
534 if (!buf)
535 die("cannot read object %s '%s'", sha1_to_hex(sha), path);
536 if (type != OBJ_BLOB)
537 die("blob expected for %s '%s'", sha1_to_hex(sha), path);
538 if (S_ISREG(mode)) {
f285a2d7 539 struct strbuf strbuf = STRBUF_INIT;
9047ebbc
MV
540 if (convert_to_working_tree(path, buf, size, &strbuf)) {
541 free(buf);
542 size = strbuf.len;
543 buf = strbuf_detach(&strbuf, NULL);
544 }
545 }
546
547 if (make_room_for_path(path) < 0) {
548 update_wd = 0;
549 free(buf);
550 goto update_index;
551 }
552 if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
553 int fd;
554 if (mode & 0100)
555 mode = 0777;
556 else
557 mode = 0666;
558 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
559 if (fd < 0)
d824cbba 560 die_errno("failed to open '%s'", path);
9047ebbc
MV
561 flush_buffer(fd, buf, size);
562 close(fd);
563 } else if (S_ISLNK(mode)) {
564 char *lnk = xmemdupz(buf, size);
565 safe_create_leading_directories_const(path);
566 unlink(path);
304dcf26 567 if (symlink(lnk, path))
d824cbba 568 die_errno("failed to symlink '%s'", path);
9047ebbc
MV
569 free(lnk);
570 } else
571 die("do not know what to do with %06o %s '%s'",
572 mode, sha1_to_hex(sha), path);
573 free(buf);
574 }
575 update_index:
576 if (update_cache)
577 add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
578}
579
b7fa51da
MV
580static void update_file(struct merge_options *o,
581 int clean,
9047ebbc
MV
582 const unsigned char *sha,
583 unsigned mode,
584 const char *path)
585{
b7fa51da 586 update_file_flags(o, sha, mode, path, o->call_depth || clean, !o->call_depth);
9047ebbc
MV
587}
588
589/* Low level file merging, update and removal */
590
591struct merge_file_info
592{
593 unsigned char sha[20];
594 unsigned mode;
595 unsigned clean:1,
596 merge:1;
597};
598
b7fa51da
MV
599static int merge_3way(struct merge_options *o,
600 mmbuffer_t *result_buf,
601 struct diff_filespec *one,
9047ebbc
MV
602 struct diff_filespec *a,
603 struct diff_filespec *b,
604 const char *branch1,
605 const char *branch2)
606{
607 mmfile_t orig, src1, src2;
4c5868f4 608 char *base_name, *name1, *name2;
9047ebbc 609 int merge_status;
8cc5b290
AP
610 int favor;
611
612 if (o->call_depth)
613 favor = 0;
614 else {
615 switch (o->recursive_variant) {
616 case MERGE_RECURSIVE_OURS:
617 favor = XDL_MERGE_FAVOR_OURS;
618 break;
619 case MERGE_RECURSIVE_THEIRS:
620 favor = XDL_MERGE_FAVOR_THEIRS;
621 break;
622 default:
623 favor = 0;
624 break;
625 }
626 }
9047ebbc 627
4c5868f4
JN
628 if (strcmp(a->path, b->path) ||
629 (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) {
630 base_name = o->ancestor == NULL ? NULL :
631 xstrdup(mkpath("%s:%s", o->ancestor, one->path));
606475f3
MR
632 name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
633 name2 = xstrdup(mkpath("%s:%s", branch2, b->path));
634 } else {
4c5868f4
JN
635 base_name = o->ancestor == NULL ? NULL :
636 xstrdup(mkpath("%s", o->ancestor));
606475f3
MR
637 name1 = xstrdup(mkpath("%s", branch1));
638 name2 = xstrdup(mkpath("%s", branch2));
639 }
9047ebbc 640
06b65939
ML
641 read_mmblob(&orig, one->sha1);
642 read_mmblob(&src1, a->sha1);
643 read_mmblob(&src2, b->sha1);
9047ebbc 644
4c5868f4 645 merge_status = ll_merge(result_buf, a->path, &orig, base_name,
9047ebbc 646 &src1, name1, &src2, name2,
73cf7f71 647 ((o->call_depth ? LL_OPT_VIRTUAL_ANCESTOR : 0) |
18b037a5 648 (o->renormalize ? LL_OPT_RENORMALIZE : 0) |
73cf7f71 649 create_ll_flag(favor)));
9047ebbc
MV
650
651 free(name1);
652 free(name2);
653 free(orig.ptr);
654 free(src1.ptr);
655 free(src2.ptr);
656 return merge_status;
657}
658
b7fa51da
MV
659static struct merge_file_info merge_file(struct merge_options *o,
660 struct diff_filespec *one,
661 struct diff_filespec *a,
662 struct diff_filespec *b,
663 const char *branch1,
664 const char *branch2)
9047ebbc
MV
665{
666 struct merge_file_info result;
667 result.merge = 0;
668 result.clean = 1;
669
670 if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) {
671 result.clean = 0;
672 if (S_ISREG(a->mode)) {
673 result.mode = a->mode;
674 hashcpy(result.sha, a->sha1);
675 } else {
676 result.mode = b->mode;
677 hashcpy(result.sha, b->sha1);
678 }
679 } else {
b7fa51da 680 if (!sha_eq(a->sha1, one->sha1) && !sha_eq(b->sha1, one->sha1))
9047ebbc
MV
681 result.merge = 1;
682
683 /*
684 * Merge modes
685 */
b7fa51da 686 if (a->mode == b->mode || a->mode == one->mode)
9047ebbc
MV
687 result.mode = b->mode;
688 else {
689 result.mode = a->mode;
b7fa51da 690 if (b->mode != one->mode) {
9047ebbc
MV
691 result.clean = 0;
692 result.merge = 1;
693 }
694 }
695
b7fa51da 696 if (sha_eq(a->sha1, b->sha1) || sha_eq(a->sha1, one->sha1))
9047ebbc 697 hashcpy(result.sha, b->sha1);
b7fa51da 698 else if (sha_eq(b->sha1, one->sha1))
9047ebbc
MV
699 hashcpy(result.sha, a->sha1);
700 else if (S_ISREG(a->mode)) {
701 mmbuffer_t result_buf;
702 int merge_status;
703
b7fa51da 704 merge_status = merge_3way(o, &result_buf, one, a, b,
9047ebbc
MV
705 branch1, branch2);
706
707 if ((merge_status < 0) || !result_buf.ptr)
708 die("Failed to execute internal merge");
709
710 if (write_sha1_file(result_buf.ptr, result_buf.size,
711 blob_type, result.sha))
712 die("Unable to add %s to database",
713 a->path);
714
715 free(result_buf.ptr);
716 result.clean = (merge_status == 0);
717 } else if (S_ISGITLINK(a->mode)) {
68d03e4a
HV
718 result.clean = merge_submodule(result.sha, one->path, one->sha1,
719 a->sha1, b->sha1);
9047ebbc
MV
720 } else if (S_ISLNK(a->mode)) {
721 hashcpy(result.sha, a->sha1);
722
723 if (!sha_eq(a->sha1, b->sha1))
724 result.clean = 0;
725 } else {
726 die("unsupported object type in the tree");
727 }
728 }
729
730 return result;
731}
732
09c01f85
EN
733static void conflict_rename_rename_1to2(struct merge_options *o,
734 struct rename *ren1,
735 const char *branch1,
736 struct rename *ren2,
737 const char *branch2)
9047ebbc 738{
09c01f85 739 /* One file was renamed in both branches, but to different names. */
9047ebbc
MV
740 char *del[2];
741 int delp = 0;
742 const char *ren1_dst = ren1->pair->two->path;
743 const char *ren2_dst = ren2->pair->two->path;
744 const char *dst_name1 = ren1_dst;
745 const char *dst_name2 = ren2_dst;
696ee23c
MV
746 if (string_list_has_string(&o->current_directory_set, ren1_dst)) {
747 dst_name1 = del[delp++] = unique_path(o, ren1_dst, branch1);
8a2fce18 748 output(o, 1, "%s is a directory in %s adding as %s instead",
9047ebbc 749 ren1_dst, branch2, dst_name1);
b7fa51da 750 remove_file(o, 0, ren1_dst, 0);
9047ebbc 751 }
696ee23c
MV
752 if (string_list_has_string(&o->current_directory_set, ren2_dst)) {
753 dst_name2 = del[delp++] = unique_path(o, ren2_dst, branch2);
8a2fce18 754 output(o, 1, "%s is a directory in %s adding as %s instead",
9047ebbc 755 ren2_dst, branch1, dst_name2);
b7fa51da 756 remove_file(o, 0, ren2_dst, 0);
9047ebbc 757 }
b7fa51da 758 if (o->call_depth) {
9047ebbc
MV
759 remove_file_from_cache(dst_name1);
760 remove_file_from_cache(dst_name2);
761 /*
762 * Uncomment to leave the conflicting names in the resulting tree
763 *
b7fa51da
MV
764 * update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, dst_name1);
765 * update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, dst_name2);
9047ebbc
MV
766 */
767 } else {
768 update_stages(dst_name1, NULL, ren1->pair->two, NULL, 1);
769 update_stages(dst_name2, NULL, NULL, ren2->pair->two, 1);
770 }
771 while (delp--)
772 free(del[delp]);
773}
774
09c01f85
EN
775static void conflict_rename_rename_2to1(struct merge_options *o,
776 struct rename *ren1,
777 const char *branch1,
778 struct rename *ren2,
779 const char *branch2)
9047ebbc 780{
09c01f85 781 /* Two files were renamed to the same thing. */
696ee23c
MV
782 char *new_path1 = unique_path(o, ren1->pair->two->path, branch1);
783 char *new_path2 = unique_path(o, ren2->pair->two->path, branch2);
8a2fce18 784 output(o, 1, "Renaming %s to %s and %s to %s instead",
9047ebbc
MV
785 ren1->pair->one->path, new_path1,
786 ren2->pair->one->path, new_path2);
b7fa51da
MV
787 remove_file(o, 0, ren1->pair->two->path, 0);
788 update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path1);
789 update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, new_path2);
9047ebbc
MV
790 free(new_path2);
791 free(new_path1);
792}
793
8a2fce18
MV
794static int process_renames(struct merge_options *o,
795 struct string_list *a_renames,
796 struct string_list *b_renames)
9047ebbc
MV
797{
798 int clean_merge = 1, i, j;
183113a5
TF
799 struct string_list a_by_dst = STRING_LIST_INIT_NODUP;
800 struct string_list b_by_dst = STRING_LIST_INIT_NODUP;
9047ebbc
MV
801 const struct rename *sre;
802
803 for (i = 0; i < a_renames->nr; i++) {
804 sre = a_renames->items[i].util;
78a395d3 805 string_list_insert(&a_by_dst, sre->pair->two->path)->util
9047ebbc
MV
806 = sre->dst_entry;
807 }
808 for (i = 0; i < b_renames->nr; i++) {
809 sre = b_renames->items[i].util;
78a395d3 810 string_list_insert(&b_by_dst, sre->pair->two->path)->util
9047ebbc
MV
811 = sre->dst_entry;
812 }
813
814 for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
9047ebbc 815 char *src;
8e24cbae 816 struct string_list *renames1, *renames2Dst;
9047ebbc
MV
817 struct rename *ren1 = NULL, *ren2 = NULL;
818 const char *branch1, *branch2;
819 const char *ren1_src, *ren1_dst;
820
821 if (i >= a_renames->nr) {
9047ebbc
MV
822 ren2 = b_renames->items[j++].util;
823 } else if (j >= b_renames->nr) {
9047ebbc
MV
824 ren1 = a_renames->items[i++].util;
825 } else {
8e24cbae
BK
826 int compare = strcmp(a_renames->items[i].string,
827 b_renames->items[j].string);
9047ebbc
MV
828 if (compare <= 0)
829 ren1 = a_renames->items[i++].util;
830 if (compare >= 0)
831 ren2 = b_renames->items[j++].util;
832 }
833
834 /* TODO: refactor, so that 1/2 are not needed */
835 if (ren1) {
836 renames1 = a_renames;
9047ebbc 837 renames2Dst = &b_by_dst;
8a2fce18
MV
838 branch1 = o->branch1;
839 branch2 = o->branch2;
9047ebbc
MV
840 } else {
841 struct rename *tmp;
842 renames1 = b_renames;
9047ebbc 843 renames2Dst = &a_by_dst;
8a2fce18
MV
844 branch1 = o->branch2;
845 branch2 = o->branch1;
9047ebbc
MV
846 tmp = ren2;
847 ren2 = ren1;
848 ren1 = tmp;
849 }
850 src = ren1->pair->one->path;
851
852 ren1->dst_entry->processed = 1;
853 ren1->src_entry->processed = 1;
854
855 if (ren1->processed)
856 continue;
857 ren1->processed = 1;
858
859 ren1_src = ren1->pair->one->path;
860 ren1_dst = ren1->pair->two->path;
861
862 if (ren2) {
863 const char *ren2_src = ren2->pair->one->path;
864 const char *ren2_dst = ren2->pair->two->path;
865 /* Renamed in 1 and renamed in 2 */
866 if (strcmp(ren1_src, ren2_src) != 0)
867 die("ren1.src != ren2.src");
868 ren2->dst_entry->processed = 1;
869 ren2->processed = 1;
870 if (strcmp(ren1_dst, ren2_dst) != 0) {
871 clean_merge = 0;
8a2fce18 872 output(o, 1, "CONFLICT (rename/rename): "
9047ebbc
MV
873 "Rename \"%s\"->\"%s\" in branch \"%s\" "
874 "rename \"%s\"->\"%s\" in \"%s\"%s",
875 src, ren1_dst, branch1,
876 src, ren2_dst, branch2,
b7fa51da
MV
877 o->call_depth ? " (left unresolved)": "");
878 if (o->call_depth) {
9047ebbc 879 remove_file_from_cache(src);
b7fa51da 880 update_file(o, 0, ren1->pair->one->sha1,
9047ebbc
MV
881 ren1->pair->one->mode, src);
882 }
09c01f85 883 conflict_rename_rename_1to2(o, ren1, branch1, ren2, branch2);
9047ebbc
MV
884 } else {
885 struct merge_file_info mfi;
b7fa51da
MV
886 remove_file(o, 1, ren1_src, 1);
887 mfi = merge_file(o,
888 ren1->pair->one,
9047ebbc
MV
889 ren1->pair->two,
890 ren2->pair->two,
891 branch1,
892 branch2);
893 if (mfi.merge || !mfi.clean)
8a2fce18 894 output(o, 1, "Renaming %s->%s", src, ren1_dst);
9047ebbc
MV
895
896 if (mfi.merge)
8a2fce18 897 output(o, 2, "Auto-merging %s", ren1_dst);
9047ebbc
MV
898
899 if (!mfi.clean) {
8a2fce18 900 output(o, 1, "CONFLICT (content): merge conflict in %s",
9047ebbc
MV
901 ren1_dst);
902 clean_merge = 0;
903
b7fa51da 904 if (!o->call_depth)
9047ebbc
MV
905 update_stages(ren1_dst,
906 ren1->pair->one,
907 ren1->pair->two,
908 ren2->pair->two,
909 1 /* clear */);
910 }
b7fa51da 911 update_file(o, mfi.clean, mfi.sha, mfi.mode, ren1_dst);
9047ebbc
MV
912 }
913 } else {
914 /* Renamed in 1, maybe changed in 2 */
915 struct string_list_item *item;
916 /* we only use sha1 and mode of these */
917 struct diff_filespec src_other, dst_other;
41d70bd6 918 int try_merge;
9047ebbc 919
41d70bd6
EN
920 /*
921 * unpack_trees loads entries from common-commit
922 * into stage 1, from head-commit into stage 2, and
923 * from merge-commit into stage 3. We keep track
924 * of which side corresponds to the rename.
925 */
926 int renamed_stage = a_renames == renames1 ? 2 : 3;
927 int other_stage = a_renames == renames1 ? 3 : 2;
9047ebbc 928
41d70bd6 929 remove_file(o, 1, ren1_src, o->call_depth || renamed_stage == 2);
9047ebbc 930
41d70bd6
EN
931 hashcpy(src_other.sha1, ren1->src_entry->stages[other_stage].sha);
932 src_other.mode = ren1->src_entry->stages[other_stage].mode;
933 hashcpy(dst_other.sha1, ren1->dst_entry->stages[other_stage].sha);
934 dst_other.mode = ren1->dst_entry->stages[other_stage].mode;
9047ebbc
MV
935 try_merge = 0;
936
86273e57 937 if (sha_eq(src_other.sha1, null_sha1)) {
9047ebbc 938 clean_merge = 0;
8a2fce18 939 output(o, 1, "CONFLICT (rename/delete): Rename %s->%s in %s "
9047ebbc
MV
940 "and deleted in %s",
941 ren1_src, ren1_dst, branch1,
942 branch2);
b7fa51da 943 update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst);
bf74106a
DO
944 if (!o->call_depth)
945 update_stages(ren1_dst, NULL,
946 branch1 == o->branch1 ?
947 ren1->pair->two : NULL,
948 branch1 == o->branch1 ?
949 NULL : ren1->pair->two, 1);
d5af5105
SK
950 } else if ((dst_other.mode == ren1->pair->two->mode) &&
951 sha_eq(dst_other.sha1, ren1->pair->two->sha1)) {
952 /* Added file on the other side
953 identical to the file being
954 renamed: clean merge */
955 update_file(o, 1, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst);
9047ebbc
MV
956 } else if (!sha_eq(dst_other.sha1, null_sha1)) {
957 const char *new_path;
958 clean_merge = 0;
959 try_merge = 1;
8a2fce18 960 output(o, 1, "CONFLICT (rename/add): Rename %s->%s in %s. "
9047ebbc
MV
961 "%s added in %s",
962 ren1_src, ren1_dst, branch1,
963 ren1_dst, branch2);
c94736a2
JH
964 if (o->call_depth) {
965 struct merge_file_info mfi;
966 struct diff_filespec one, a, b;
967
968 one.path = a.path = b.path =
969 (char *)ren1_dst;
970 hashcpy(one.sha1, null_sha1);
971 one.mode = 0;
972 hashcpy(a.sha1, ren1->pair->two->sha1);
973 a.mode = ren1->pair->two->mode;
974 hashcpy(b.sha1, dst_other.sha1);
975 b.mode = dst_other.mode;
976 mfi = merge_file(o, &one, &a, &b,
977 branch1,
978 branch2);
979 output(o, 1, "Adding merged %s", ren1_dst);
980 update_file(o, 0,
981 mfi.sha,
982 mfi.mode,
983 ren1_dst);
984 } else {
985 new_path = unique_path(o, ren1_dst, branch2);
986 output(o, 1, "Adding as %s instead", new_path);
987 update_file(o, 0, dst_other.sha1, dst_other.mode, new_path);
988 }
e8c8b713 989 } else if ((item = string_list_lookup(renames2Dst, ren1_dst))) {
9047ebbc
MV
990 ren2 = item->util;
991 clean_merge = 0;
992 ren2->processed = 1;
8a2fce18
MV
993 output(o, 1, "CONFLICT (rename/rename): "
994 "Rename %s->%s in %s. "
9047ebbc
MV
995 "Rename %s->%s in %s",
996 ren1_src, ren1_dst, branch1,
997 ren2->pair->one->path, ren2->pair->two->path, branch2);
09c01f85 998 conflict_rename_rename_2to1(o, ren1, branch1, ren2, branch2);
9047ebbc
MV
999 } else
1000 try_merge = 1;
1001
1002 if (try_merge) {
8a2fce18 1003 struct diff_filespec *one, *a, *b;
9047ebbc
MV
1004 struct merge_file_info mfi;
1005 src_other.path = (char *)ren1_src;
1006
8a2fce18 1007 one = ren1->pair->one;
9047ebbc
MV
1008 if (a_renames == renames1) {
1009 a = ren1->pair->two;
1010 b = &src_other;
1011 } else {
1012 b = ren1->pair->two;
1013 a = &src_other;
1014 }
b7fa51da 1015 mfi = merge_file(o, one, a, b,
8a2fce18 1016 o->branch1, o->branch2);
9047ebbc
MV
1017
1018 if (mfi.clean &&
1019 sha_eq(mfi.sha, ren1->pair->two->sha1) &&
5a2580d6 1020 mfi.mode == ren1->pair->two->mode) {
9047ebbc 1021 /*
a3e41367 1022 * This message is part of
9047ebbc
MV
1023 * t6022 test. If you change
1024 * it update the test too.
1025 */
8a2fce18 1026 output(o, 3, "Skipped %s (merged same as existing)", ren1_dst);
5a2580d6
EN
1027
1028 /* There may be higher stage entries left
1029 * in the index (e.g. due to a D/F
1030 * conflict) that need to be resolved.
1031 */
96ecac67
EN
1032 if (!ren1->dst_entry->stages[2].mode !=
1033 !ren1->dst_entry->stages[3].mode)
5a2580d6 1034 ren1->dst_entry->processed = 0;
5a2580d6 1035 } else {
9047ebbc 1036 if (mfi.merge || !mfi.clean)
8a2fce18 1037 output(o, 1, "Renaming %s => %s", ren1_src, ren1_dst);
9047ebbc 1038 if (mfi.merge)
8a2fce18 1039 output(o, 2, "Auto-merging %s", ren1_dst);
9047ebbc 1040 if (!mfi.clean) {
8a2fce18 1041 output(o, 1, "CONFLICT (rename/modify): Merge conflict in %s",
9047ebbc
MV
1042 ren1_dst);
1043 clean_merge = 0;
1044
b7fa51da 1045 if (!o->call_depth)
9047ebbc 1046 update_stages(ren1_dst,
8a2fce18 1047 one, a, b, 1);
9047ebbc 1048 }
b7fa51da 1049 update_file(o, mfi.clean, mfi.sha, mfi.mode, ren1_dst);
9047ebbc
MV
1050 }
1051 }
1052 }
1053 }
1054 string_list_clear(&a_by_dst, 0);
1055 string_list_clear(&b_by_dst, 0);
1056
1057 return clean_merge;
1058}
1059
1060static unsigned char *stage_sha(const unsigned char *sha, unsigned mode)
1061{
1062 return (is_null_sha1(sha) || mode == 0) ? NULL: (unsigned char *)sha;
1063}
1064
331a1838
EB
1065static int read_sha1_strbuf(const unsigned char *sha1, struct strbuf *dst)
1066{
1067 void *buf;
1068 enum object_type type;
1069 unsigned long size;
1070 buf = read_sha1_file(sha1, &type, &size);
1071 if (!buf)
1072 return error("cannot read object %s", sha1_to_hex(sha1));
1073 if (type != OBJ_BLOB) {
1074 free(buf);
1075 return error("object %s is not a blob", sha1_to_hex(sha1));
1076 }
1077 strbuf_attach(dst, buf, size, size + 1);
1078 return 0;
1079}
1080
1081static int blob_unchanged(const unsigned char *o_sha,
1082 const unsigned char *a_sha,
3e7589b7 1083 int renormalize, const char *path)
331a1838
EB
1084{
1085 struct strbuf o = STRBUF_INIT;
1086 struct strbuf a = STRBUF_INIT;
1087 int ret = 0; /* assume changed for safety */
1088
1089 if (sha_eq(o_sha, a_sha))
1090 return 1;
3e7589b7 1091 if (!renormalize)
331a1838
EB
1092 return 0;
1093
1094 assert(o_sha && a_sha);
1095 if (read_sha1_strbuf(o_sha, &o) || read_sha1_strbuf(a_sha, &a))
1096 goto error_return;
1097 /*
1098 * Note: binary | is used so that both renormalizations are
1099 * performed. Comparison can be skipped if both files are
1100 * unchanged since their sha1s have already been compared.
1101 */
1102 if (renormalize_buffer(path, o.buf, o.len, &o) |
1103 renormalize_buffer(path, a.buf, o.len, &a))
1104 ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len));
1105
1106error_return:
1107 strbuf_release(&o);
1108 strbuf_release(&a);
1109 return ret;
1110}
1111
9047ebbc 1112/* Per entry merge function */
8a2fce18
MV
1113static int process_entry(struct merge_options *o,
1114 const char *path, struct stage_data *entry)
9047ebbc
MV
1115{
1116 /*
1117 printf("processing entry, clean cache: %s\n", index_only ? "yes": "no");
1118 print_index_entry("\tpath: ", entry);
1119 */
1120 int clean_merge = 1;
1bc0ab7c 1121 int normalize = o->renormalize;
9047ebbc
MV
1122 unsigned o_mode = entry->stages[1].mode;
1123 unsigned a_mode = entry->stages[2].mode;
1124 unsigned b_mode = entry->stages[3].mode;
1125 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1126 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1127 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1128
37348937 1129 entry->processed = 1;
9047ebbc
MV
1130 if (o_sha && (!a_sha || !b_sha)) {
1131 /* Case A: Deleted in one */
1132 if ((!a_sha && !b_sha) ||
3e7589b7
JN
1133 (!b_sha && blob_unchanged(o_sha, a_sha, normalize, path)) ||
1134 (!a_sha && blob_unchanged(o_sha, b_sha, normalize, path))) {
9047ebbc
MV
1135 /* Deleted in both or deleted in one and
1136 * unchanged in the other */
1137 if (a_sha)
8a2fce18 1138 output(o, 2, "Removing %s", path);
9047ebbc 1139 /* do not touch working file if it did not exist */
b7fa51da 1140 remove_file(o, 1, path, !a_sha);
9047ebbc
MV
1141 } else {
1142 /* Deleted in one and changed in the other */
1143 clean_merge = 0;
1144 if (!a_sha) {
8a2fce18 1145 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
9047ebbc 1146 "and modified in %s. Version %s of %s left in tree.",
8a2fce18
MV
1147 path, o->branch1,
1148 o->branch2, o->branch2, path);
b7fa51da 1149 update_file(o, 0, b_sha, b_mode, path);
9047ebbc 1150 } else {
8a2fce18 1151 output(o, 1, "CONFLICT (delete/modify): %s deleted in %s "
9047ebbc 1152 "and modified in %s. Version %s of %s left in tree.",
8a2fce18
MV
1153 path, o->branch2,
1154 o->branch1, o->branch1, path);
b7fa51da 1155 update_file(o, 0, a_sha, a_mode, path);
9047ebbc
MV
1156 }
1157 }
1158
1159 } else if ((!o_sha && a_sha && !b_sha) ||
1160 (!o_sha && !a_sha && b_sha)) {
1161 /* Case B: Added in one. */
9047ebbc
MV
1162 unsigned mode;
1163 const unsigned char *sha;
9047ebbc
MV
1164
1165 if (a_sha) {
9047ebbc
MV
1166 mode = a_mode;
1167 sha = a_sha;
9047ebbc 1168 } else {
9047ebbc
MV
1169 mode = b_mode;
1170 sha = b_sha;
9047ebbc 1171 }
696ee23c 1172 if (string_list_has_string(&o->current_directory_set, path)) {
37348937
EN
1173 /* Handle D->F conflicts after all subfiles */
1174 entry->processed = 0;
1175 /* But get any file out of the way now, so conflicted
1176 * entries below the directory of the same name can
1177 * be put in the working directory.
1178 */
1179 if (a_sha)
1180 output(o, 2, "Removing %s", path);
1181 /* do not touch working file if it did not exist */
1182 remove_file(o, 0, path, !a_sha);
1183 return 1; /* Assume clean till processed */
9047ebbc 1184 } else {
8a2fce18 1185 output(o, 2, "Adding %s", path);
b7fa51da 1186 update_file(o, 1, sha, mode, path);
9047ebbc
MV
1187 }
1188 } else if (a_sha && b_sha) {
1189 /* Case C: Added in both (check for same permissions) and */
1190 /* case D: Modified in both, but differently. */
1191 const char *reason = "content";
1192 struct merge_file_info mfi;
8a2fce18 1193 struct diff_filespec one, a, b;
9047ebbc
MV
1194
1195 if (!o_sha) {
1196 reason = "add/add";
1197 o_sha = (unsigned char *)null_sha1;
1198 }
8a2fce18
MV
1199 output(o, 2, "Auto-merging %s", path);
1200 one.path = a.path = b.path = (char *)path;
1201 hashcpy(one.sha1, o_sha);
1202 one.mode = o_mode;
9047ebbc
MV
1203 hashcpy(a.sha1, a_sha);
1204 a.mode = a_mode;
1205 hashcpy(b.sha1, b_sha);
1206 b.mode = b_mode;
1207
b7fa51da 1208 mfi = merge_file(o, &one, &a, &b,
8a2fce18 1209 o->branch1, o->branch2);
9047ebbc
MV
1210
1211 clean_merge = mfi.clean;
39d8e271
CB
1212 if (!mfi.clean) {
1213 if (S_ISGITLINK(mfi.mode))
1214 reason = "submodule";
8a2fce18 1215 output(o, 1, "CONFLICT (%s): Merge conflict in %s",
9047ebbc 1216 reason, path);
9047ebbc 1217 }
39d8e271 1218 update_file(o, mfi.clean, mfi.sha, mfi.mode, path);
9047ebbc
MV
1219 } else if (!o_sha && !a_sha && !b_sha) {
1220 /*
1221 * this entry was deleted altogether. a_mode == 0 means
1222 * we had that path and want to actively remove it.
1223 */
b7fa51da 1224 remove_file(o, 1, path, !a_mode);
9047ebbc
MV
1225 } else
1226 die("Fatal merge failure, shouldn't happen.");
1227
1228 return clean_merge;
1229}
1230
37348937
EN
1231/*
1232 * Per entry merge function for D/F conflicts, to be called only after
1233 * all files below dir have been processed. We do this because in the
1234 * cases we can cleanly resolve D/F conflicts, process_entry() can clean
1235 * out all the files below the directory for us.
1236 */
1237static int process_df_entry(struct merge_options *o,
1238 const char *path, struct stage_data *entry)
1239{
1240 int clean_merge = 1;
1241 unsigned o_mode = entry->stages[1].mode;
1242 unsigned a_mode = entry->stages[2].mode;
1243 unsigned b_mode = entry->stages[3].mode;
1244 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1245 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1246 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1247 const char *add_branch;
1248 const char *other_branch;
1249 unsigned mode;
1250 const unsigned char *sha;
1251 const char *conf;
1252 struct stat st;
1253
7edba4c4
JH
1254 if (!((!o_sha && a_sha && !b_sha) || (!o_sha && !a_sha && b_sha)))
1255 return 1; /* we don't handle non D-F cases */
37348937
EN
1256
1257 entry->processed = 1;
1258
1259 if (a_sha) {
1260 add_branch = o->branch1;
1261 other_branch = o->branch2;
1262 mode = a_mode;
1263 sha = a_sha;
1264 conf = "file/directory";
1265 } else {
1266 add_branch = o->branch2;
1267 other_branch = o->branch1;
1268 mode = b_mode;
1269 sha = b_sha;
1270 conf = "directory/file";
1271 }
1272 if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
1273 const char *new_path = unique_path(o, path, add_branch);
1274 clean_merge = 0;
1275 output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. "
1276 "Adding %s as %s",
1277 conf, path, other_branch, path, new_path);
1278 remove_file(o, 0, path, 0);
1279 update_file(o, 0, sha, mode, new_path);
1280 } else {
1281 output(o, 2, "Adding %s", path);
1282 update_file(o, 1, sha, mode, path);
1283 }
1284
1285 return clean_merge;
1286}
1287
8a2fce18
MV
1288int merge_trees(struct merge_options *o,
1289 struct tree *head,
9047ebbc
MV
1290 struct tree *merge,
1291 struct tree *common,
9047ebbc
MV
1292 struct tree **result)
1293{
1294 int code, clean;
1295
85e51b78
JH
1296 if (o->subtree_shift) {
1297 merge = shift_tree_object(head, merge, o->subtree_shift);
1298 common = shift_tree_object(head, common, o->subtree_shift);
9047ebbc
MV
1299 }
1300
1301 if (sha_eq(common->object.sha1, merge->object.sha1)) {
5e5ffa09 1302 output(o, 0, "Already up-to-date!");
9047ebbc
MV
1303 *result = head;
1304 return 1;
1305 }
1306
b7fa51da 1307 code = git_merge_trees(o->call_depth, common, head, merge);
9047ebbc 1308
fadd069d
JH
1309 if (code != 0) {
1310 if (show(o, 4) || o->call_depth)
1311 die("merging of trees %s and %s failed",
1312 sha1_to_hex(head->object.sha1),
1313 sha1_to_hex(merge->object.sha1));
1314 else
1315 exit(128);
1316 }
9047ebbc
MV
1317
1318 if (unmerged_cache()) {
1319 struct string_list *entries, *re_head, *re_merge;
1320 int i;
696ee23c
MV
1321 string_list_clear(&o->current_file_set, 1);
1322 string_list_clear(&o->current_directory_set, 1);
1323 get_files_dirs(o, head);
1324 get_files_dirs(o, merge);
9047ebbc
MV
1325
1326 entries = get_unmerged();
8a2fce18
MV
1327 re_head = get_renames(o, head, common, head, merge, entries);
1328 re_merge = get_renames(o, merge, common, head, merge, entries);
1329 clean = process_renames(o, re_head, re_merge);
9047ebbc
MV
1330 for (i = 0; i < entries->nr; i++) {
1331 const char *path = entries->items[i].string;
1332 struct stage_data *e = entries->items[i].util;
1333 if (!e->processed
8a2fce18 1334 && !process_entry(o, path, e))
9047ebbc
MV
1335 clean = 0;
1336 }
37348937
EN
1337 for (i = 0; i < entries->nr; i++) {
1338 const char *path = entries->items[i].string;
1339 struct stage_data *e = entries->items[i].util;
1340 if (!e->processed
1341 && !process_df_entry(o, path, e))
1342 clean = 0;
1343 }
7edba4c4
JH
1344 for (i = 0; i < entries->nr; i++) {
1345 struct stage_data *e = entries->items[i].util;
1346 if (!e->processed)
1347 die("Unprocessed path??? %s",
1348 entries->items[i].string);
1349 }
9047ebbc
MV
1350
1351 string_list_clear(re_merge, 0);
1352 string_list_clear(re_head, 0);
1353 string_list_clear(entries, 1);
1354
1355 }
1356 else
1357 clean = 1;
1358
b7fa51da 1359 if (o->call_depth)
8a2fce18 1360 *result = write_tree_from_memory(o);
9047ebbc
MV
1361
1362 return clean;
1363}
1364
1365static struct commit_list *reverse_commit_list(struct commit_list *list)
1366{
1367 struct commit_list *next = NULL, *current, *backup;
1368 for (current = list; current; current = backup) {
1369 backup = current->next;
1370 current->next = next;
1371 next = current;
1372 }
1373 return next;
1374}
1375
1376/*
1377 * Merge the commits h1 and h2, return the resulting virtual
1378 * commit object and a flag indicating the cleanness of the merge.
1379 */
8a2fce18
MV
1380int merge_recursive(struct merge_options *o,
1381 struct commit *h1,
9047ebbc 1382 struct commit *h2,
9047ebbc
MV
1383 struct commit_list *ca,
1384 struct commit **result)
1385{
1386 struct commit_list *iter;
1387 struct commit *merged_common_ancestors;
1388 struct tree *mrtree = mrtree;
1389 int clean;
1390
8a2fce18
MV
1391 if (show(o, 4)) {
1392 output(o, 4, "Merging:");
5033639c
MV
1393 output_commit_title(o, h1);
1394 output_commit_title(o, h2);
9047ebbc
MV
1395 }
1396
1397 if (!ca) {
1398 ca = get_merge_bases(h1, h2, 1);
1399 ca = reverse_commit_list(ca);
1400 }
1401
8a2fce18
MV
1402 if (show(o, 5)) {
1403 output(o, 5, "found %u common ancestor(s):", commit_list_count(ca));
9047ebbc 1404 for (iter = ca; iter; iter = iter->next)
5033639c 1405 output_commit_title(o, iter->item);
9047ebbc
MV
1406 }
1407
1408 merged_common_ancestors = pop_commit(&ca);
1409 if (merged_common_ancestors == NULL) {
1410 /* if there is no common ancestor, make an empty tree */
1411 struct tree *tree = xcalloc(1, sizeof(struct tree));
1412
1413 tree->object.parsed = 1;
1414 tree->object.type = OBJ_TREE;
1415 pretend_sha1_file(NULL, 0, OBJ_TREE, tree->object.sha1);
1416 merged_common_ancestors = make_virtual_commit(tree, "ancestor");
1417 }
1418
1419 for (iter = ca; iter; iter = iter->next) {
8a2fce18 1420 const char *saved_b1, *saved_b2;
5033639c 1421 o->call_depth++;
9047ebbc
MV
1422 /*
1423 * When the merge fails, the result contains files
1424 * with conflict markers. The cleanness flag is
1425 * ignored, it was never actually used, as result of
1426 * merge_trees has always overwritten it: the committed
1427 * "conflicts" were already resolved.
1428 */
1429 discard_cache();
8a2fce18
MV
1430 saved_b1 = o->branch1;
1431 saved_b2 = o->branch2;
1432 o->branch1 = "Temporary merge branch 1";
1433 o->branch2 = "Temporary merge branch 2";
1434 merge_recursive(o, merged_common_ancestors, iter->item,
1435 NULL, &merged_common_ancestors);
1436 o->branch1 = saved_b1;
1437 o->branch2 = saved_b2;
5033639c 1438 o->call_depth--;
9047ebbc
MV
1439
1440 if (!merged_common_ancestors)
1441 die("merge returned no commit");
1442 }
1443
1444 discard_cache();
b7fa51da 1445 if (!o->call_depth)
9047ebbc 1446 read_cache();
9047ebbc 1447
7ca56aa0 1448 o->ancestor = "merged common ancestors";
8a2fce18
MV
1449 clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
1450 &mrtree);
9047ebbc 1451
b7fa51da 1452 if (o->call_depth) {
9047ebbc
MV
1453 *result = make_virtual_commit(mrtree, "merged tree");
1454 commit_list_insert(h1, &(*result)->parents);
1455 commit_list_insert(h2, &(*result)->parents->next);
1456 }
c7d84924 1457 flush_output(o);
9047ebbc
MV
1458 return clean;
1459}
1460
73118f89
SB
1461static struct commit *get_ref(const unsigned char *sha1, const char *name)
1462{
1463 struct object *object;
1464
1465 object = deref_tag(parse_object(sha1), name, strlen(name));
1466 if (!object)
1467 return NULL;
1468 if (object->type == OBJ_TREE)
1469 return make_virtual_commit((struct tree*)object, name);
1470 if (object->type != OBJ_COMMIT)
1471 return NULL;
1472 if (parse_commit((struct commit *)object))
1473 return NULL;
1474 return (struct commit *)object;
1475}
1476
8a2fce18
MV
1477int merge_recursive_generic(struct merge_options *o,
1478 const unsigned char *head,
1479 const unsigned char *merge,
1480 int num_base_list,
1481 const unsigned char **base_list,
1482 struct commit **result)
73118f89
SB
1483{
1484 int clean, index_fd;
1485 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
8a2fce18
MV
1486 struct commit *head_commit = get_ref(head, o->branch1);
1487 struct commit *next_commit = get_ref(merge, o->branch2);
73118f89
SB
1488 struct commit_list *ca = NULL;
1489
1490 if (base_list) {
1491 int i;
8a2fce18 1492 for (i = 0; i < num_base_list; ++i) {
73118f89 1493 struct commit *base;
8a2fce18 1494 if (!(base = get_ref(base_list[i], sha1_to_hex(base_list[i]))))
73118f89 1495 return error("Could not parse object '%s'",
8a2fce18 1496 sha1_to_hex(base_list[i]));
73118f89
SB
1497 commit_list_insert(base, &ca);
1498 }
1499 }
1500
1501 index_fd = hold_locked_index(lock, 1);
8a2fce18
MV
1502 clean = merge_recursive(o, head_commit, next_commit, ca,
1503 result);
73118f89
SB
1504 if (active_cache_changed &&
1505 (write_cache(index_fd, active_cache, active_nr) ||
1506 commit_locked_index(lock)))
1507 return error("Unable to write index.");
1508
1509 return clean ? 0 : 1;
1510}
1511
8a2fce18 1512static int merge_recursive_config(const char *var, const char *value, void *cb)
9047ebbc 1513{
8a2fce18 1514 struct merge_options *o = cb;
9047ebbc 1515 if (!strcasecmp(var, "merge.verbosity")) {
8a2fce18 1516 o->verbosity = git_config_int(var, value);
9047ebbc
MV
1517 return 0;
1518 }
1519 if (!strcasecmp(var, "diff.renamelimit")) {
8a2fce18 1520 o->diff_rename_limit = git_config_int(var, value);
9047ebbc
MV
1521 return 0;
1522 }
1523 if (!strcasecmp(var, "merge.renamelimit")) {
8a2fce18 1524 o->merge_rename_limit = git_config_int(var, value);
9047ebbc
MV
1525 return 0;
1526 }
e137a892 1527 return git_xmerge_config(var, value, cb);
9047ebbc
MV
1528}
1529
8a2fce18 1530void init_merge_options(struct merge_options *o)
9047ebbc 1531{
8a2fce18
MV
1532 memset(o, 0, sizeof(struct merge_options));
1533 o->verbosity = 2;
1534 o->buffer_output = 1;
1535 o->diff_rename_limit = -1;
1536 o->merge_rename_limit = -1;
7610fa57 1537 o->renormalize = 0;
8a2fce18 1538 git_config(merge_recursive_config, o);
9047ebbc 1539 if (getenv("GIT_MERGE_VERBOSITY"))
8a2fce18 1540 o->verbosity =
9047ebbc 1541 strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10);
8a2fce18
MV
1542 if (o->verbosity >= 5)
1543 o->buffer_output = 0;
c7d84924 1544 strbuf_init(&o->obuf, 0);
696ee23c
MV
1545 memset(&o->current_file_set, 0, sizeof(struct string_list));
1546 o->current_file_set.strdup_strings = 1;
1547 memset(&o->current_directory_set, 0, sizeof(struct string_list));
1548 o->current_directory_set.strdup_strings = 1;
9047ebbc 1549}