prepare the builtins for a libified merge_recursive()
[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 */
6#include "cache.h"
1c4b6604 7#include "advice.h"
697cc8ef 8#include "lockfile.h"
9047ebbc
MV
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"
9047ebbc
MV
21#include "attr.h"
22#include "merge-recursive.h"
9800c0df 23#include "dir.h"
68d03e4a 24#include "submodule.h"
9047ebbc 25
85e51b78
JH
26static struct tree *shift_tree_object(struct tree *one, struct tree *two,
27 const char *subtree_shift)
9047ebbc 28{
f2fd0760 29 struct object_id shifted;
9047ebbc 30
85e51b78 31 if (!*subtree_shift) {
82db3d44 32 shift_tree(&one->object.oid, &two->object.oid, &shifted, 0);
85e51b78 33 } else {
82db3d44 34 shift_tree_by(&one->object.oid, &two->object.oid, &shifted,
85e51b78
JH
35 subtree_shift);
36 }
f2fd0760 37 if (!oidcmp(&two->object.oid, &shifted))
9047ebbc 38 return two;
f2fd0760 39 return lookup_tree(shifted.hash);
9047ebbc
MV
40}
41
2af202be 42static struct commit *make_virtual_commit(struct tree *tree, const char *comment)
9047ebbc 43{
10322a0a 44 struct commit *commit = alloc_commit_node();
ae8e4c9c
JH
45 struct merge_remote_desc *desc = xmalloc(sizeof(*desc));
46
47 desc->name = comment;
48 desc->obj = (struct object *)commit;
9047ebbc 49 commit->tree = tree;
ae8e4c9c 50 commit->util = desc;
9047ebbc
MV
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 */
b4da9d62 59static int oid_eq(const struct object_id *a, const struct object_id *b)
9047ebbc
MV
60{
61 if (!a && !b)
62 return 2;
b4da9d62 63 return a && b && oidcmp(a, b) == 0;
9047ebbc
MV
64}
65
25c39363
EN
66enum rename_type {
67 RENAME_NORMAL = 0,
68 RENAME_DELETE,
4f66dade 69 RENAME_ONE_FILE_TO_ONE,
461f5041
EN
70 RENAME_ONE_FILE_TO_TWO,
71 RENAME_TWO_FILES_TO_ONE
25c39363
EN
72};
73
4f66dade 74struct rename_conflict_info {
25c39363
EN
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;
232c635f
EN
82 struct diff_filespec ren1_other;
83 struct diff_filespec ren2_other;
25c39363
EN
84};
85
9047ebbc
MV
86/*
87 * Since we want to write the index eventually, we cannot reuse the index
88 * for these (temporary) data.
89 */
9cba13ca
JN
90struct stage_data {
91 struct {
9047ebbc 92 unsigned mode;
fd429e98 93 struct object_id oid;
9047ebbc 94 } stages[4];
4f66dade 95 struct rename_conflict_info *rename_conflict_info;
9047ebbc
MV
96 unsigned processed:1;
97};
98
4f66dade
EN
99static 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,
232c635f
EN
105 struct stage_data *dst_entry2,
106 struct merge_options *o,
107 struct stage_data *src_entry1,
108 struct stage_data *src_entry2)
25c39363 109{
4f66dade 110 struct rename_conflict_info *ci = xcalloc(1, sizeof(struct rename_conflict_info));
25c39363
EN
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;
4f66dade 117 dst_entry1->rename_conflict_info = ci;
25c39363
EN
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;
4f66dade 124 dst_entry2->rename_conflict_info = ci;
25c39363 125 }
232c635f
EN
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;
fd429e98 137 oidcpy(&ci->ren1_other.oid, &src_entry1->stages[ostage1].oid);
232c635f
EN
138 ci->ren1_other.mode = src_entry1->stages[ostage1].mode;
139
140 ci->ren2_other.path = pair2->one->path;
fd429e98 141 oidcpy(&ci->ren2_other.oid, &src_entry2->stages[ostage2].oid);
232c635f 142 ci->ren2_other.mode = src_entry2->stages[ostage2].mode;
25c39363
EN
143 }
144}
145
8a2fce18 146static int show(struct merge_options *o, int v)
9047ebbc 147{
5033639c 148 return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5;
9047ebbc
MV
149}
150
c7d84924 151static void flush_output(struct merge_options *o)
9047ebbc 152{
c7d84924
MV
153 if (o->obuf.len) {
154 fputs(o->obuf.buf, stdout);
155 strbuf_reset(&o->obuf);
9047ebbc
MV
156 }
157}
158
28bea9e5 159__attribute__((format (printf, 3, 4)))
8a2fce18 160static void output(struct merge_options *o, int v, const char *fmt, ...)
9047ebbc 161{
9047ebbc
MV
162 va_list ap;
163
8a2fce18 164 if (!show(o, v))
9047ebbc
MV
165 return;
166
415792ed 167 strbuf_addchars(&o->obuf, ' ', o->call_depth * 2);
9047ebbc
MV
168
169 va_start(ap, fmt);
ebeb6090 170 strbuf_vaddf(&o->obuf, fmt, ap);
9047ebbc
MV
171 va_end(ap);
172
294b2680 173 strbuf_addch(&o->obuf, '\n');
8a2fce18 174 if (!o->buffer_output)
c7d84924 175 flush_output(o);
9047ebbc
MV
176}
177
5033639c 178static void output_commit_title(struct merge_options *o, struct commit *commit)
9047ebbc
MV
179{
180 int i;
c7d84924 181 flush_output(o);
5033639c 182 for (i = o->call_depth; i--;)
9047ebbc
MV
183 fputs(" ", stdout);
184 if (commit->util)
ae8e4c9c 185 printf("virtual %s\n", merge_remote_util(commit)->name);
9047ebbc 186 else {
ed1c9977 187 printf("%s ", find_unique_abbrev(commit->object.oid.hash, DEFAULT_ABBREV));
9047ebbc 188 if (parse_commit(commit) != 0)
55653a68 189 printf(_("(bad commit)\n"));
9047ebbc 190 else {
49b7120e 191 const char *title;
8597ea3a 192 const char *msg = get_commit_buffer(commit, NULL);
bc6b8fc1 193 int len = find_commit_subject(msg, &title);
49b7120e
CC
194 if (len)
195 printf("%.*s\n", len, title);
bc6b8fc1 196 unuse_commit_buffer(commit, msg);
9047ebbc
MV
197 }
198 }
199}
200
b4da9d62 201static int add_cacheinfo(unsigned int mode, const struct object_id *oid,
9047ebbc
MV
202 const char *path, int stage, int refresh, int options)
203{
204 struct cache_entry *ce;
1335d76e
JH
205 int ret;
206
21bed620 207 ce = make_cache_entry(mode, oid ? oid->hash : null_sha1, path, stage, 0);
9047ebbc 208 if (!ce)
55653a68 209 return error(_("addinfo_cache failed for path '%s'"), path);
1335d76e
JH
210
211 ret = add_cache_entry(ce, options);
212 if (refresh) {
213 struct cache_entry *nce;
214
215 nce = refresh_cache_entry(ce, CE_MATCH_REFRESH | CE_MATCH_IGNORE_MISSING);
216 if (nce != ce)
217 ret = add_cache_entry(nce, options);
218 }
219 return ret;
9047ebbc
MV
220}
221
9047ebbc
MV
222static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree)
223{
224 parse_tree(tree);
225 init_tree_desc(desc, tree->buffer, tree->size);
226}
227
228static int git_merge_trees(int index_only,
229 struct tree *common,
230 struct tree *head,
231 struct tree *merge)
232{
233 int rc;
234 struct tree_desc t[3];
235 struct unpack_trees_options opts;
236
237 memset(&opts, 0, sizeof(opts));
238 if (index_only)
239 opts.index_only = 1;
240 else
241 opts.update = 1;
242 opts.merge = 1;
243 opts.head_idx = 2;
244 opts.fn = threeway_merge;
245 opts.src_index = &the_index;
246 opts.dst_index = &the_index;
e294030f 247 setup_unpack_trees_porcelain(&opts, "merge");
9047ebbc
MV
248
249 init_tree_desc_from_tree(t+0, common);
250 init_tree_desc_from_tree(t+1, head);
251 init_tree_desc_from_tree(t+2, merge);
252
253 rc = unpack_trees(3, t, &opts);
254 cache_tree_free(&active_cache_tree);
255 return rc;
256}
257
8a2fce18 258struct tree *write_tree_from_memory(struct merge_options *o)
9047ebbc
MV
259{
260 struct tree *result = NULL;
261
262 if (unmerged_cache()) {
263 int i;
19c6a4f8 264 fprintf(stderr, "BUG: There are unmerged index entries:\n");
9047ebbc 265 for (i = 0; i < active_nr; i++) {
9c5e6c80 266 const struct cache_entry *ce = active_cache[i];
9047ebbc 267 if (ce_stage(ce))
c43ba42e 268 fprintf(stderr, "BUG: %d %.*s\n", ce_stage(ce),
19c6a4f8 269 (int)ce_namelen(ce), ce->name);
9047ebbc 270 }
ef1177d1 271 die("BUG: unmerged index entries in merge-recursive.c");
9047ebbc
MV
272 }
273
274 if (!active_cache_tree)
275 active_cache_tree = cache_tree();
276
277 if (!cache_tree_fully_valid(active_cache_tree) &&
d0cfc3e8 278 cache_tree_update(&the_index, 0) < 0)
55653a68 279 die(_("error building trees"));
9047ebbc
MV
280
281 result = lookup_tree(active_cache_tree->sha1);
282
283 return result;
284}
285
286static int save_files_dirs(const unsigned char *sha1,
6a0b0b6d 287 struct strbuf *base, const char *path,
9047ebbc
MV
288 unsigned int mode, int stage, void *context)
289{
6a0b0b6d 290 int baselen = base->len;
696ee23c
MV
291 struct merge_options *o = context;
292
6a0b0b6d 293 strbuf_addstr(base, path);
9047ebbc
MV
294
295 if (S_ISDIR(mode))
6a0b0b6d 296 string_list_insert(&o->current_directory_set, base->buf);
9047ebbc 297 else
6a0b0b6d 298 string_list_insert(&o->current_file_set, base->buf);
9047ebbc 299
6a0b0b6d 300 strbuf_setlen(base, baselen);
d3bee161 301 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
9047ebbc
MV
302}
303
696ee23c 304static int get_files_dirs(struct merge_options *o, struct tree *tree)
9047ebbc
MV
305{
306 int n;
f0096c06 307 struct pathspec match_all;
9a087274 308 memset(&match_all, 0, sizeof(match_all));
f0096c06 309 if (read_tree_recursive(tree, "", 0, 0, &match_all, save_files_dirs, o))
9047ebbc 310 return 0;
696ee23c 311 n = o->current_file_set.nr + o->current_directory_set.nr;
9047ebbc
MV
312 return n;
313}
314
315/*
316 * Returns an index_entry instance which doesn't have to correspond to
317 * a real cache entry in Git's index.
318 */
319static struct stage_data *insert_stage_data(const char *path,
320 struct tree *o, struct tree *a, struct tree *b,
321 struct string_list *entries)
322{
323 struct string_list_item *item;
324 struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
ed1c9977 325 get_tree_entry(o->object.oid.hash, path,
fd429e98 326 e->stages[1].oid.hash, &e->stages[1].mode);
ed1c9977 327 get_tree_entry(a->object.oid.hash, path,
fd429e98 328 e->stages[2].oid.hash, &e->stages[2].mode);
ed1c9977 329 get_tree_entry(b->object.oid.hash, path,
fd429e98 330 e->stages[3].oid.hash, &e->stages[3].mode);
78a395d3 331 item = string_list_insert(entries, path);
9047ebbc
MV
332 item->util = e;
333 return e;
334}
335
336/*
337 * Create a dictionary mapping file names to stage_data objects. The
338 * dictionary contains one entry for every path with a non-zero stage entry.
339 */
340static struct string_list *get_unmerged(void)
341{
342 struct string_list *unmerged = xcalloc(1, sizeof(struct string_list));
343 int i;
344
345 unmerged->strdup_strings = 1;
346
347 for (i = 0; i < active_nr; i++) {
348 struct string_list_item *item;
349 struct stage_data *e;
9c5e6c80 350 const struct cache_entry *ce = active_cache[i];
9047ebbc
MV
351 if (!ce_stage(ce))
352 continue;
353
e8c8b713 354 item = string_list_lookup(unmerged, ce->name);
9047ebbc 355 if (!item) {
78a395d3 356 item = string_list_insert(unmerged, ce->name);
9047ebbc
MV
357 item->util = xcalloc(1, sizeof(struct stage_data));
358 }
359 e = item->util;
360 e->stages[ce_stage(ce)].mode = ce->ce_mode;
fd429e98 361 hashcpy(e->stages[ce_stage(ce)].oid.hash, ce->sha1);
9047ebbc
MV
362 }
363
364 return unmerged;
365}
366
f0fd4d05 367static int string_list_df_name_compare(const void *a, const void *b)
ef02b317 368{
f0fd4d05
EN
369 const struct string_list_item *one = a;
370 const struct string_list_item *two = b;
371 int onelen = strlen(one->string);
372 int twolen = strlen(two->string);
373 /*
374 * Here we only care that entries for D/F conflicts are
375 * adjacent, in particular with the file of the D/F conflict
376 * appearing before files below the corresponding directory.
377 * The order of the rest of the list is irrelevant for us.
ef02b317 378 *
f0fd4d05
EN
379 * To achieve this, we sort with df_name_compare and provide
380 * the mode S_IFDIR so that D/F conflicts will sort correctly.
381 * We use the mode S_IFDIR for everything else for simplicity,
382 * since in other cases any changes in their order due to
383 * sorting cause no problems for us.
384 */
385 int cmp = df_name_compare(one->string, onelen, S_IFDIR,
386 two->string, twolen, S_IFDIR);
387 /*
388 * Now that 'foo' and 'foo/bar' compare equal, we have to make sure
389 * that 'foo' comes before 'foo/bar'.
ef02b317 390 */
f0fd4d05
EN
391 if (cmp)
392 return cmp;
393 return onelen - twolen;
394}
395
70cc3d36
EN
396static void record_df_conflict_files(struct merge_options *o,
397 struct string_list *entries)
ef02b317 398{
70cc3d36 399 /* If there is a D/F conflict and the file for such a conflict
f7d650c0 400 * currently exist in the working tree, we want to allow it to be
edd2faf5
EN
401 * removed to make room for the corresponding directory if needed.
402 * The files underneath the directories of such D/F conflicts will
403 * be processed before the corresponding file involved in the D/F
404 * conflict. If the D/F directory ends up being removed by the
405 * merge, then we won't have to touch the D/F file. If the D/F
406 * directory needs to be written to the working copy, then the D/F
407 * file will simply be removed (in make_room_for_path()) to make
408 * room for the necessary paths. Note that if both the directory
409 * and the file need to be present, then the D/F file will be
410 * reinstated with a new unique name at the time it is processed.
ef02b317 411 */
f701aae0 412 struct string_list df_sorted_entries;
ef02b317 413 const char *last_file = NULL;
c8516500 414 int last_len = 0;
ef02b317
EN
415 int i;
416
0b30e812
EN
417 /*
418 * If we're merging merge-bases, we don't want to bother with
419 * any working directory changes.
420 */
421 if (o->call_depth)
422 return;
423
f0fd4d05 424 /* Ensure D/F conflicts are adjacent in the entries list. */
f701aae0 425 memset(&df_sorted_entries, 0, sizeof(struct string_list));
ef02b317 426 for (i = 0; i < entries->nr; i++) {
f701aae0
EN
427 struct string_list_item *next = &entries->items[i];
428 string_list_append(&df_sorted_entries, next->string)->util =
429 next->util;
430 }
431 qsort(df_sorted_entries.items, entries->nr, sizeof(*entries->items),
f0fd4d05
EN
432 string_list_df_name_compare);
433
70cc3d36 434 string_list_clear(&o->df_conflict_file_set, 1);
f701aae0
EN
435 for (i = 0; i < df_sorted_entries.nr; i++) {
436 const char *path = df_sorted_entries.items[i].string;
ef02b317 437 int len = strlen(path);
f701aae0 438 struct stage_data *e = df_sorted_entries.items[i].util;
ef02b317
EN
439
440 /*
441 * Check if last_file & path correspond to a D/F conflict;
442 * i.e. whether path is last_file+'/'+<something>.
70cc3d36
EN
443 * If so, record that it's okay to remove last_file to make
444 * room for path and friends if needed.
ef02b317
EN
445 */
446 if (last_file &&
447 len > last_len &&
448 memcmp(path, last_file, last_len) == 0 &&
449 path[last_len] == '/') {
70cc3d36 450 string_list_insert(&o->df_conflict_file_set, last_file);
ef02b317
EN
451 }
452
453 /*
454 * Determine whether path could exist as a file in the
455 * working directory as a possible D/F conflict. This
456 * will only occur when it exists in stage 2 as a
457 * file.
458 */
459 if (S_ISREG(e->stages[2].mode) || S_ISLNK(e->stages[2].mode)) {
460 last_file = path;
461 last_len = len;
ef02b317
EN
462 } else {
463 last_file = NULL;
464 }
465 }
f701aae0 466 string_list_clear(&df_sorted_entries, 0);
ef02b317
EN
467}
468
9cba13ca 469struct rename {
9047ebbc
MV
470 struct diff_filepair *pair;
471 struct stage_data *src_entry;
472 struct stage_data *dst_entry;
473 unsigned processed:1;
474};
475
476/*
477 * Get information of all renames which occurred between 'o_tree' and
478 * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
479 * 'b_tree') to be able to associate the correct cache entries with
480 * the rename information. 'tree' is always equal to either a_tree or b_tree.
481 */
8a2fce18
MV
482static struct string_list *get_renames(struct merge_options *o,
483 struct tree *tree,
484 struct tree *o_tree,
485 struct tree *a_tree,
486 struct tree *b_tree,
487 struct string_list *entries)
9047ebbc
MV
488{
489 int i;
490 struct string_list *renames;
491 struct diff_options opts;
492
493 renames = xcalloc(1, sizeof(struct string_list));
d2b11eca
FGA
494 if (!o->detect_rename)
495 return renames;
496
9047ebbc
MV
497 diff_setup(&opts);
498 DIFF_OPT_SET(&opts, RECURSIVE);
4f7cb99a 499 DIFF_OPT_CLR(&opts, RENAME_EMPTY);
9047ebbc 500 opts.detect_rename = DIFF_DETECT_RENAME;
8a2fce18
MV
501 opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
502 o->diff_rename_limit >= 0 ? o->diff_rename_limit :
92c57e5c 503 1000;
10ae7526 504 opts.rename_score = o->rename_score;
99bfc669 505 opts.show_rename_progress = o->show_rename_progress;
9047ebbc 506 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
28452655 507 diff_setup_done(&opts);
ed1c9977 508 diff_tree_sha1(o_tree->object.oid.hash, tree->object.oid.hash, "", &opts);
9047ebbc 509 diffcore_std(&opts);
bf0ab10f
JK
510 if (opts.needed_rename_limit > o->needed_rename_limit)
511 o->needed_rename_limit = opts.needed_rename_limit;
9047ebbc
MV
512 for (i = 0; i < diff_queued_diff.nr; ++i) {
513 struct string_list_item *item;
514 struct rename *re;
515 struct diff_filepair *pair = diff_queued_diff.queue[i];
516 if (pair->status != 'R') {
517 diff_free_filepair(pair);
518 continue;
519 }
520 re = xmalloc(sizeof(*re));
521 re->processed = 0;
522 re->pair = pair;
e8c8b713 523 item = string_list_lookup(entries, re->pair->one->path);
9047ebbc
MV
524 if (!item)
525 re->src_entry = insert_stage_data(re->pair->one->path,
526 o_tree, a_tree, b_tree, entries);
527 else
528 re->src_entry = item->util;
529
e8c8b713 530 item = string_list_lookup(entries, re->pair->two->path);
9047ebbc
MV
531 if (!item)
532 re->dst_entry = insert_stage_data(re->pair->two->path,
533 o_tree, a_tree, b_tree, entries);
534 else
535 re->dst_entry = item->util;
78a395d3 536 item = string_list_insert(renames, pair->one->path);
9047ebbc
MV
537 item->util = re;
538 }
539 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
540 diff_queued_diff.nr = 0;
541 diff_flush(&opts);
542 return renames;
543}
544
650467cf
EN
545static int update_stages(const char *path, const struct diff_filespec *o,
546 const struct diff_filespec *a,
547 const struct diff_filespec *b)
9047ebbc 548{
f53d3977
EN
549
550 /*
551 * NOTE: It is usually a bad idea to call update_stages on a path
552 * before calling update_file on that same path, since it can
553 * sometimes lead to spurious "refusing to lose untracked file..."
554 * messages from update_file (via make_room_for path via
555 * would_lose_untracked). Instead, reverse the order of the calls
556 * (executing update_file first and then update_stages).
557 */
650467cf
EN
558 int clear = 1;
559 int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_SKIP_DFCHECK;
9047ebbc
MV
560 if (clear)
561 if (remove_file_from_cache(path))
562 return -1;
563 if (o)
b4da9d62 564 if (add_cacheinfo(o->mode, &o->oid, path, 1, 0, options))
9047ebbc
MV
565 return -1;
566 if (a)
b4da9d62 567 if (add_cacheinfo(a->mode, &a->oid, path, 2, 0, options))
9047ebbc
MV
568 return -1;
569 if (b)
b4da9d62 570 if (add_cacheinfo(b->mode, &b->oid, path, 3, 0, options))
9047ebbc
MV
571 return -1;
572 return 0;
573}
574
b8ddf164
EN
575static void update_entry(struct stage_data *entry,
576 struct diff_filespec *o,
577 struct diff_filespec *a,
578 struct diff_filespec *b)
2ff739f9 579{
2ff739f9
EN
580 entry->processed = 0;
581 entry->stages[1].mode = o->mode;
582 entry->stages[2].mode = a->mode;
583 entry->stages[3].mode = b->mode;
fd429e98 584 oidcpy(&entry->stages[1].oid, &o->oid);
585 oidcpy(&entry->stages[2].oid, &a->oid);
586 oidcpy(&entry->stages[3].oid, &b->oid);
2ff739f9
EN
587}
588
b7fa51da
MV
589static int remove_file(struct merge_options *o, int clean,
590 const char *path, int no_wd)
9047ebbc 591{
b7fa51da
MV
592 int update_cache = o->call_depth || clean;
593 int update_working_directory = !o->call_depth && !no_wd;
9047ebbc
MV
594
595 if (update_cache) {
596 if (remove_file_from_cache(path))
597 return -1;
598 }
599 if (update_working_directory) {
ae352c7f
DT
600 if (ignore_case) {
601 struct cache_entry *ce;
602 ce = cache_file_exists(path, strlen(path), ignore_case);
603 if (ce && ce_stage(ce) == 0)
604 return 0;
605 }
25755e84 606 if (remove_path(path))
9047ebbc 607 return -1;
9047ebbc
MV
608 }
609 return 0;
610}
611
45bc131d
JK
612/* add a string to a strbuf, but converting "/" to "_" */
613static void add_flattened_path(struct strbuf *out, const char *s)
614{
615 size_t i = out->len;
616 strbuf_addstr(out, s);
617 for (; i < out->len; i++)
618 if (out->buf[i] == '/')
619 out->buf[i] = '_';
620}
621
696ee23c 622static char *unique_path(struct merge_options *o, const char *path, const char *branch)
9047ebbc 623{
45bc131d 624 struct strbuf newpath = STRBUF_INIT;
9047ebbc 625 int suffix = 0;
45bc131d
JK
626 size_t base_len;
627
628 strbuf_addf(&newpath, "%s~", path);
629 add_flattened_path(&newpath, branch);
630
631 base_len = newpath.len;
632 while (string_list_has_string(&o->current_file_set, newpath.buf) ||
633 string_list_has_string(&o->current_directory_set, newpath.buf) ||
8e1b62f1 634 (!o->call_depth && file_exists(newpath.buf))) {
45bc131d
JK
635 strbuf_setlen(&newpath, base_len);
636 strbuf_addf(&newpath, "_%d", suffix++);
637 }
638
639 string_list_insert(&o->current_file_set, newpath.buf);
640 return strbuf_detach(&newpath, NULL);
9047ebbc
MV
641}
642
f2507b4e
EN
643static int dir_in_way(const char *path, int check_working_copy)
644{
b4600fbe
JK
645 int pos;
646 struct strbuf dirpath = STRBUF_INIT;
f2507b4e
EN
647 struct stat st;
648
b4600fbe
JK
649 strbuf_addstr(&dirpath, path);
650 strbuf_addch(&dirpath, '/');
f2507b4e 651
b4600fbe 652 pos = cache_name_pos(dirpath.buf, dirpath.len);
f2507b4e
EN
653
654 if (pos < 0)
655 pos = -1 - pos;
656 if (pos < active_nr &&
b4600fbe
JK
657 !strncmp(dirpath.buf, active_cache[pos]->name, dirpath.len)) {
658 strbuf_release(&dirpath);
f2507b4e
EN
659 return 1;
660 }
661
b4600fbe 662 strbuf_release(&dirpath);
f2507b4e
EN
663 return check_working_copy && !lstat(path, &st) && S_ISDIR(st.st_mode);
664}
665
aacb82de 666static int was_tracked(const char *path)
60c91181
JH
667{
668 int pos = cache_name_pos(path, strlen(path));
669
f8d83fb6
JS
670 if (0 <= pos)
671 /* we have been tracking this path */
672 return 1;
673
674 /*
675 * Look for an unmerged entry for the path,
676 * specifically stage #2, which would indicate
677 * that "our" side before the merge started
678 * had the path tracked (and resulted in a conflict).
679 */
680 for (pos = -1 - pos;
681 pos < active_nr && !strcmp(path, active_cache[pos]->name);
682 pos++)
683 if (ce_stage(active_cache[pos]) == 2)
aacb82de 684 return 1;
aacb82de 685 return 0;
60c91181
JH
686}
687
aacb82de 688static int would_lose_untracked(const char *path)
9047ebbc 689{
aacb82de 690 return !was_tracked(path) && file_exists(path);
60c91181
JH
691}
692
ed0148a5 693static int make_room_for_path(struct merge_options *o, const char *path)
9047ebbc 694{
ed0148a5 695 int status, i;
55653a68 696 const char *msg = _("failed to create path '%s'%s");
9047ebbc 697
ed0148a5
EN
698 /* Unlink any D/F conflict files that are in the way */
699 for (i = 0; i < o->df_conflict_file_set.nr; i++) {
700 const char *df_path = o->df_conflict_file_set.items[i].string;
701 size_t pathlen = strlen(path);
702 size_t df_pathlen = strlen(df_path);
703 if (df_pathlen < pathlen &&
704 path[df_pathlen] == '/' &&
705 strncmp(path, df_path, df_pathlen) == 0) {
706 output(o, 3,
55653a68 707 _("Removing %s to make room for subdirectory\n"),
ed0148a5
EN
708 df_path);
709 unlink(df_path);
710 unsorted_string_list_delete_item(&o->df_conflict_file_set,
711 i, 0);
712 break;
713 }
714 }
715
716 /* Make sure leading directories are created */
9047ebbc
MV
717 status = safe_create_leading_directories_const(path);
718 if (status) {
0be0521b 719 if (status == SCLD_EXISTS) {
9047ebbc 720 /* something else exists */
55653a68 721 error(msg, path, _(": perhaps a D/F conflict?"));
9047ebbc
MV
722 return -1;
723 }
724 die(msg, path, "");
725 }
726
60c91181
JH
727 /*
728 * Do not unlink a file in the work tree if we are not
729 * tracking it.
730 */
731 if (would_lose_untracked(path))
55653a68 732 return error(_("refusing to lose untracked file at '%s'"),
60c91181
JH
733 path);
734
9047ebbc
MV
735 /* Successful unlink is good.. */
736 if (!unlink(path))
737 return 0;
738 /* .. and so is no existing file */
739 if (errno == ENOENT)
740 return 0;
741 /* .. but not some other error (who really cares what?) */
55653a68 742 return error(msg, path, _(": perhaps a D/F conflict?"));
9047ebbc
MV
743}
744
b7fa51da 745static void update_file_flags(struct merge_options *o,
b4da9d62 746 const struct object_id *oid,
9047ebbc
MV
747 unsigned mode,
748 const char *path,
749 int update_cache,
750 int update_wd)
751{
b7fa51da 752 if (o->call_depth)
9047ebbc
MV
753 update_wd = 0;
754
755 if (update_wd) {
756 enum object_type type;
757 void *buf;
758 unsigned long size;
759
68d03e4a 760 if (S_ISGITLINK(mode)) {
0c44c943
JH
761 /*
762 * We may later decide to recursively descend into
763 * the submodule directory and update its index
764 * and/or work tree, but we do not do that now.
765 */
68d03e4a 766 update_wd = 0;
0c44c943 767 goto update_index;
68d03e4a 768 }
9047ebbc 769
b4da9d62 770 buf = read_sha1_file(oid->hash, &type, &size);
9047ebbc 771 if (!buf)
b4da9d62 772 die(_("cannot read object %s '%s'"), oid_to_hex(oid), path);
9047ebbc 773 if (type != OBJ_BLOB)
b4da9d62 774 die(_("blob expected for %s '%s'"), oid_to_hex(oid), path);
9047ebbc 775 if (S_ISREG(mode)) {
f285a2d7 776 struct strbuf strbuf = STRBUF_INIT;
9047ebbc
MV
777 if (convert_to_working_tree(path, buf, size, &strbuf)) {
778 free(buf);
779 size = strbuf.len;
780 buf = strbuf_detach(&strbuf, NULL);
781 }
782 }
783
ed0148a5 784 if (make_room_for_path(o, path) < 0) {
9047ebbc
MV
785 update_wd = 0;
786 free(buf);
787 goto update_index;
788 }
789 if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
790 int fd;
791 if (mode & 0100)
792 mode = 0777;
793 else
794 mode = 0666;
795 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
796 if (fd < 0)
55653a68 797 die_errno(_("failed to open '%s'"), path);
f633ea2c 798 write_in_full(fd, buf, size);
9047ebbc
MV
799 close(fd);
800 } else if (S_ISLNK(mode)) {
801 char *lnk = xmemdupz(buf, size);
802 safe_create_leading_directories_const(path);
803 unlink(path);
304dcf26 804 if (symlink(lnk, path))
55653a68 805 die_errno(_("failed to symlink '%s'"), path);
9047ebbc
MV
806 free(lnk);
807 } else
55653a68 808 die(_("do not know what to do with %06o %s '%s'"),
b4da9d62 809 mode, oid_to_hex(oid), path);
9047ebbc
MV
810 free(buf);
811 }
812 update_index:
813 if (update_cache)
b4da9d62 814 add_cacheinfo(mode, oid, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
9047ebbc
MV
815}
816
b7fa51da
MV
817static void update_file(struct merge_options *o,
818 int clean,
b4da9d62 819 const struct object_id *oid,
9047ebbc
MV
820 unsigned mode,
821 const char *path)
822{
b4da9d62 823 update_file_flags(o, oid, mode, path, o->call_depth || clean, !o->call_depth);
9047ebbc
MV
824}
825
826/* Low level file merging, update and removal */
827
9cba13ca 828struct merge_file_info {
9b561499 829 struct object_id oid;
9047ebbc
MV
830 unsigned mode;
831 unsigned clean:1,
832 merge:1;
833};
834
b7fa51da
MV
835static int merge_3way(struct merge_options *o,
836 mmbuffer_t *result_buf,
0c059420
EN
837 const struct diff_filespec *one,
838 const struct diff_filespec *a,
839 const struct diff_filespec *b,
9047ebbc
MV
840 const char *branch1,
841 const char *branch2)
842{
843 mmfile_t orig, src1, src2;
712516bc 844 struct ll_merge_options ll_opts = {0};
4c5868f4 845 char *base_name, *name1, *name2;
9047ebbc 846 int merge_status;
8cc5b290 847
712516bc 848 ll_opts.renormalize = o->renormalize;
58a1ece4 849 ll_opts.xdl_opts = o->xdl_opts;
712516bc
JN
850
851 if (o->call_depth) {
852 ll_opts.virtual_ancestor = 1;
853 ll_opts.variant = 0;
854 } else {
8cc5b290
AP
855 switch (o->recursive_variant) {
856 case MERGE_RECURSIVE_OURS:
712516bc 857 ll_opts.variant = XDL_MERGE_FAVOR_OURS;
8cc5b290
AP
858 break;
859 case MERGE_RECURSIVE_THEIRS:
712516bc 860 ll_opts.variant = XDL_MERGE_FAVOR_THEIRS;
8cc5b290
AP
861 break;
862 default:
712516bc 863 ll_opts.variant = 0;
8cc5b290
AP
864 break;
865 }
866 }
9047ebbc 867
4c5868f4
JN
868 if (strcmp(a->path, b->path) ||
869 (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) {
870 base_name = o->ancestor == NULL ? NULL :
4e2d094d
RJ
871 mkpathdup("%s:%s", o->ancestor, one->path);
872 name1 = mkpathdup("%s:%s", branch1, a->path);
873 name2 = mkpathdup("%s:%s", branch2, b->path);
606475f3 874 } else {
4c5868f4 875 base_name = o->ancestor == NULL ? NULL :
4e2d094d
RJ
876 mkpathdup("%s", o->ancestor);
877 name1 = mkpathdup("%s", branch1);
878 name2 = mkpathdup("%s", branch2);
606475f3 879 }
9047ebbc 880
a0d12c44 881 read_mmblob(&orig, one->oid.hash);
882 read_mmblob(&src1, a->oid.hash);
883 read_mmblob(&src2, b->oid.hash);
9047ebbc 884
4c5868f4 885 merge_status = ll_merge(result_buf, a->path, &orig, base_name,
712516bc 886 &src1, name1, &src2, name2, &ll_opts);
9047ebbc 887
4e2d094d 888 free(base_name);
9047ebbc
MV
889 free(name1);
890 free(name2);
891 free(orig.ptr);
892 free(src1.ptr);
893 free(src2.ptr);
894 return merge_status;
895}
896
6bdaead1
EN
897static struct merge_file_info merge_file_1(struct merge_options *o,
898 const struct diff_filespec *one,
899 const struct diff_filespec *a,
900 const struct diff_filespec *b,
901 const char *branch1,
902 const char *branch2)
9047ebbc
MV
903{
904 struct merge_file_info result;
905 result.merge = 0;
906 result.clean = 1;
907
908 if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) {
909 result.clean = 0;
910 if (S_ISREG(a->mode)) {
911 result.mode = a->mode;
9b561499 912 oidcpy(&result.oid, &a->oid);
9047ebbc
MV
913 } else {
914 result.mode = b->mode;
9b561499 915 oidcpy(&result.oid, &b->oid);
9047ebbc
MV
916 }
917 } else {
b4da9d62 918 if (!oid_eq(&a->oid, &one->oid) && !oid_eq(&b->oid, &one->oid))
9047ebbc
MV
919 result.merge = 1;
920
921 /*
922 * Merge modes
923 */
b7fa51da 924 if (a->mode == b->mode || a->mode == one->mode)
9047ebbc
MV
925 result.mode = b->mode;
926 else {
927 result.mode = a->mode;
b7fa51da 928 if (b->mode != one->mode) {
9047ebbc
MV
929 result.clean = 0;
930 result.merge = 1;
931 }
932 }
933
b4da9d62 934 if (oid_eq(&a->oid, &b->oid) || oid_eq(&a->oid, &one->oid))
9b561499 935 oidcpy(&result.oid, &b->oid);
b4da9d62 936 else if (oid_eq(&b->oid, &one->oid))
9b561499 937 oidcpy(&result.oid, &a->oid);
9047ebbc
MV
938 else if (S_ISREG(a->mode)) {
939 mmbuffer_t result_buf;
940 int merge_status;
941
b7fa51da 942 merge_status = merge_3way(o, &result_buf, one, a, b,
9047ebbc
MV
943 branch1, branch2);
944
945 if ((merge_status < 0) || !result_buf.ptr)
55653a68 946 die(_("Failed to execute internal merge"));
9047ebbc
MV
947
948 if (write_sha1_file(result_buf.ptr, result_buf.size,
9b561499 949 blob_type, result.oid.hash))
55653a68 950 die(_("Unable to add %s to database"),
9047ebbc
MV
951 a->path);
952
953 free(result_buf.ptr);
954 result.clean = (merge_status == 0);
955 } else if (S_ISGITLINK(a->mode)) {
9b561499 956 result.clean = merge_submodule(result.oid.hash,
a0d12c44 957 one->path,
958 one->oid.hash,
959 a->oid.hash,
960 b->oid.hash,
80988783 961 !o->call_depth);
9047ebbc 962 } else if (S_ISLNK(a->mode)) {
9b561499 963 oidcpy(&result.oid, &a->oid);
9047ebbc 964
b4da9d62 965 if (!oid_eq(&a->oid, &b->oid))
9047ebbc 966 result.clean = 0;
ef1177d1 967 } else
7e97e100 968 die("BUG: unsupported object type in the tree");
9047ebbc
MV
969 }
970
971 return result;
972}
973
dac47415
EN
974static struct merge_file_info
975merge_file_special_markers(struct merge_options *o,
976 const struct diff_filespec *one,
977 const struct diff_filespec *a,
978 const struct diff_filespec *b,
979 const char *branch1,
980 const char *filename1,
981 const char *branch2,
982 const char *filename2)
983{
984 char *side1 = NULL;
985 char *side2 = NULL;
986 struct merge_file_info mfi;
987
28310186
JK
988 if (filename1)
989 side1 = xstrfmt("%s:%s", branch1, filename1);
990 if (filename2)
991 side2 = xstrfmt("%s:%s", branch2, filename2);
dac47415
EN
992
993 mfi = merge_file_1(o, one, a, b,
994 side1 ? side1 : branch1, side2 ? side2 : branch2);
995 free(side1);
996 free(side2);
997 return mfi;
998}
999
fa2364ec 1000static struct merge_file_info merge_file_one(struct merge_options *o,
6bdaead1 1001 const char *path,
b4da9d62 1002 const struct object_id *o_oid, int o_mode,
1003 const struct object_id *a_oid, int a_mode,
1004 const struct object_id *b_oid, int b_mode,
6bdaead1
EN
1005 const char *branch1,
1006 const char *branch2)
1007{
1008 struct diff_filespec one, a, b;
1009
1010 one.path = a.path = b.path = (char *)path;
b4da9d62 1011 oidcpy(&one.oid, o_oid);
6bdaead1 1012 one.mode = o_mode;
b4da9d62 1013 oidcpy(&a.oid, a_oid);
6bdaead1 1014 a.mode = a_mode;
b4da9d62 1015 oidcpy(&b.oid, b_oid);
6bdaead1
EN
1016 b.mode = b_mode;
1017 return merge_file_1(o, &one, &a, &b, branch1, branch2);
1018}
1019
b7033252
EN
1020static void handle_change_delete(struct merge_options *o,
1021 const char *path,
b4da9d62 1022 const struct object_id *o_oid, int o_mode,
1023 const struct object_id *a_oid, int a_mode,
1024 const struct object_id *b_oid, int b_mode,
b7033252
EN
1025 const char *change, const char *change_past)
1026{
1027 char *renamed = NULL;
1028 if (dir_in_way(path, !o->call_depth)) {
b4da9d62 1029 renamed = unique_path(o, path, a_oid ? o->branch1 : o->branch2);
b7033252
EN
1030 }
1031
1032 if (o->call_depth) {
1033 /*
1034 * We cannot arbitrarily accept either a_sha or b_sha as
1035 * correct; since there is no true "middle point" between
1036 * them, simply reuse the base version for virtual merge base.
1037 */
1038 remove_file_from_cache(path);
b4da9d62 1039 update_file(o, 0, o_oid, o_mode, renamed ? renamed : path);
1040 } else if (!a_oid) {
55653a68
JX
1041 if (!renamed) {
1042 output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1043 "and %s in %s. Version %s of %s left in tree."),
1044 change, path, o->branch1, change_past,
1045 o->branch2, o->branch2, path);
b4da9d62 1046 update_file(o, 0, b_oid, b_mode, path);
55653a68
JX
1047 } else {
1048 output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1049 "and %s in %s. Version %s of %s left in tree at %s."),
1050 change, path, o->branch1, change_past,
1051 o->branch2, o->branch2, path, renamed);
b4da9d62 1052 update_file(o, 0, b_oid, b_mode, renamed);
55653a68 1053 }
b7033252 1054 } else {
55653a68
JX
1055 if (!renamed) {
1056 output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1057 "and %s in %s. Version %s of %s left in tree."),
1058 change, path, o->branch2, change_past,
1059 o->branch1, o->branch1, path);
1060 } else {
1061 output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
1062 "and %s in %s. Version %s of %s left in tree at %s."),
1063 change, path, o->branch2, change_past,
1064 o->branch1, o->branch1, path, renamed);
b4da9d62 1065 update_file(o, 0, a_oid, a_mode, renamed);
55653a68 1066 }
35a74abf
EN
1067 /*
1068 * No need to call update_file() on path when !renamed, since
1069 * that would needlessly touch path. We could call
1070 * update_file_flags() with update_cache=0 and update_wd=0,
1071 * but that's a no-op.
1072 */
b7033252
EN
1073 }
1074 free(renamed);
1075}
1076
6ef2cb00
EN
1077static void conflict_rename_delete(struct merge_options *o,
1078 struct diff_filepair *pair,
1079 const char *rename_branch,
1080 const char *other_branch)
9047ebbc 1081{
e03acb8b
EN
1082 const struct diff_filespec *orig = pair->one;
1083 const struct diff_filespec *dest = pair->two;
b4da9d62 1084 const struct object_id *a_oid = NULL;
1085 const struct object_id *b_oid = NULL;
e03acb8b
EN
1086 int a_mode = 0;
1087 int b_mode = 0;
1088
1089 if (rename_branch == o->branch1) {
b4da9d62 1090 a_oid = &dest->oid;
e03acb8b
EN
1091 a_mode = dest->mode;
1092 } else {
b4da9d62 1093 b_oid = &dest->oid;
e03acb8b
EN
1094 b_mode = dest->mode;
1095 }
6ef2cb00 1096
f53d3977
EN
1097 handle_change_delete(o,
1098 o->call_depth ? orig->path : dest->path,
b4da9d62 1099 &orig->oid, orig->mode,
1100 a_oid, a_mode,
1101 b_oid, b_mode,
55653a68 1102 _("rename"), _("renamed"));
f53d3977 1103
e03acb8b
EN
1104 if (o->call_depth) {
1105 remove_file_from_cache(dest->path);
e03acb8b 1106 } else {
e03acb8b
EN
1107 update_stages(dest->path, NULL,
1108 rename_branch == o->branch1 ? dest : NULL,
1109 rename_branch == o->branch1 ? NULL : dest);
a0de2f6b 1110 }
e03acb8b 1111
6ef2cb00
EN
1112}
1113
1ac91b32
EN
1114static struct diff_filespec *filespec_from_entry(struct diff_filespec *target,
1115 struct stage_data *entry,
1116 int stage)
9047ebbc 1117{
b4da9d62 1118 struct object_id *oid = &entry->stages[stage].oid;
1ac91b32 1119 unsigned mode = entry->stages[stage].mode;
b4da9d62 1120 if (mode == 0 || is_null_oid(oid))
1ac91b32 1121 return NULL;
b4da9d62 1122 oidcpy(&target->oid, oid);
1ac91b32
EN
1123 target->mode = mode;
1124 return target;
1125}
1126
3672c971
EN
1127static void handle_file(struct merge_options *o,
1128 struct diff_filespec *rename,
1129 int stage,
1130 struct rename_conflict_info *ci)
1131{
1132 char *dst_name = rename->path;
1133 struct stage_data *dst_entry;
1134 const char *cur_branch, *other_branch;
1135 struct diff_filespec other;
1136 struct diff_filespec *add;
1137
1138 if (stage == 2) {
1139 dst_entry = ci->dst_entry1;
1140 cur_branch = ci->branch1;
1141 other_branch = ci->branch2;
1142 } else {
1143 dst_entry = ci->dst_entry2;
1144 cur_branch = ci->branch2;
1145 other_branch = ci->branch1;
9047ebbc 1146 }
3672c971
EN
1147
1148 add = filespec_from_entry(&other, dst_entry, stage ^ 1);
3672c971
EN
1149 if (add) {
1150 char *add_name = unique_path(o, rename->path, other_branch);
b4da9d62 1151 update_file(o, 0, &add->oid, add->mode, add_name);
3672c971
EN
1152
1153 remove_file(o, 0, rename->path, 0);
1154 dst_name = unique_path(o, rename->path, cur_branch);
1155 } else {
1156 if (dir_in_way(rename->path, !o->call_depth)) {
1157 dst_name = unique_path(o, rename->path, cur_branch);
55653a68 1158 output(o, 1, _("%s is a directory in %s adding as %s instead"),
3672c971
EN
1159 rename->path, other_branch, dst_name);
1160 }
9047ebbc 1161 }
b4da9d62 1162 update_file(o, 0, &rename->oid, rename->mode, dst_name);
f53d3977
EN
1163 if (stage == 2)
1164 update_stages(rename->path, NULL, rename, add);
1165 else
1166 update_stages(rename->path, NULL, add, rename);
3672c971
EN
1167
1168 if (dst_name != rename->path)
1169 free(dst_name);
1170}
1171
09c01f85 1172static void conflict_rename_rename_1to2(struct merge_options *o,
a99b7f22 1173 struct rename_conflict_info *ci)
9047ebbc 1174{
09c01f85 1175 /* One file was renamed in both branches, but to different names. */
a99b7f22
EN
1176 struct diff_filespec *one = ci->pair1->one;
1177 struct diff_filespec *a = ci->pair1->two;
1178 struct diff_filespec *b = ci->pair2->two;
4f66dade 1179
55653a68 1180 output(o, 1, _("CONFLICT (rename/rename): "
4f66dade 1181 "Rename \"%s\"->\"%s\" in branch \"%s\" "
55653a68 1182 "rename \"%s\"->\"%s\" in \"%s\"%s"),
a99b7f22
EN
1183 one->path, a->path, ci->branch1,
1184 one->path, b->path, ci->branch2,
55653a68 1185 o->call_depth ? _(" (left unresolved)") : "");
b7fa51da 1186 if (o->call_depth) {
c52ff85d 1187 struct merge_file_info mfi;
6d63070c
EN
1188 struct diff_filespec other;
1189 struct diff_filespec *add;
fa2364ec 1190 mfi = merge_file_one(o, one->path,
b4da9d62 1191 &one->oid, one->mode,
1192 &a->oid, a->mode,
1193 &b->oid, b->mode,
a99b7f22 1194 ci->branch1, ci->branch2);
9047ebbc 1195 /*
c52ff85d
EN
1196 * FIXME: For rename/add-source conflicts (if we could detect
1197 * such), this is wrong. We should instead find a unique
1198 * pathname and then either rename the add-source file to that
1199 * unique path, or use that unique path instead of src here.
9047ebbc 1200 */
b4da9d62 1201 update_file(o, 0, &mfi.oid, mfi.mode, one->path);
07413c5a 1202
6d63070c
EN
1203 /*
1204 * Above, we put the merged content at the merge-base's
1205 * path. Now we usually need to delete both a->path and
1206 * b->path. However, the rename on each side of the merge
1207 * could also be involved in a rename/add conflict. In
1208 * such cases, we should keep the added file around,
1209 * resolving the conflict at that path in its favor.
1210 */
1211 add = filespec_from_entry(&other, ci->dst_entry1, 2 ^ 1);
1212 if (add)
b4da9d62 1213 update_file(o, 0, &add->oid, add->mode, a->path);
6d63070c
EN
1214 else
1215 remove_file_from_cache(a->path);
1216 add = filespec_from_entry(&other, ci->dst_entry2, 3 ^ 1);
1217 if (add)
b4da9d62 1218 update_file(o, 0, &add->oid, add->mode, b->path);
6d63070c
EN
1219 else
1220 remove_file_from_cache(b->path);
9047ebbc 1221 } else {
3672c971
EN
1222 handle_file(o, a, 2, ci);
1223 handle_file(o, b, 3, ci);
9047ebbc 1224 }
9047ebbc
MV
1225}
1226
09c01f85 1227static void conflict_rename_rename_2to1(struct merge_options *o,
461f5041 1228 struct rename_conflict_info *ci)
9047ebbc 1229{
461f5041
EN
1230 /* Two files, a & b, were renamed to the same thing, c. */
1231 struct diff_filespec *a = ci->pair1->one;
1232 struct diff_filespec *b = ci->pair2->one;
1233 struct diff_filespec *c1 = ci->pair1->two;
1234 struct diff_filespec *c2 = ci->pair2->two;
1235 char *path = c1->path; /* == c2->path */
434b8525
EN
1236 struct merge_file_info mfi_c1;
1237 struct merge_file_info mfi_c2;
461f5041 1238
55653a68 1239 output(o, 1, _("CONFLICT (rename/rename): "
461f5041 1240 "Rename %s->%s in %s. "
55653a68 1241 "Rename %s->%s in %s"),
461f5041
EN
1242 a->path, c1->path, ci->branch1,
1243 b->path, c2->path, ci->branch2);
1244
8e1b62f1
EN
1245 remove_file(o, 1, a->path, o->call_depth || would_lose_untracked(a->path));
1246 remove_file(o, 1, b->path, o->call_depth || would_lose_untracked(b->path));
461f5041 1247
434b8525
EN
1248 mfi_c1 = merge_file_special_markers(o, a, c1, &ci->ren1_other,
1249 o->branch1, c1->path,
1250 o->branch2, ci->ren1_other.path);
1251 mfi_c2 = merge_file_special_markers(o, b, &ci->ren2_other, c2,
1252 o->branch1, ci->ren2_other.path,
1253 o->branch2, c2->path);
1254
0a6b8712 1255 if (o->call_depth) {
434b8525
EN
1256 /*
1257 * If mfi_c1.clean && mfi_c2.clean, then it might make
1258 * sense to do a two-way merge of those results. But, I
1259 * think in all cases, it makes sense to have the virtual
1260 * merge base just undo the renames; they can be detected
1261 * again later for the non-recursive merge.
1262 */
1263 remove_file(o, 0, path, 0);
b4da9d62 1264 update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, a->path);
1265 update_file(o, 0, &mfi_c2.oid, mfi_c2.mode, b->path);
0a6b8712 1266 } else {
461f5041
EN
1267 char *new_path1 = unique_path(o, path, ci->branch1);
1268 char *new_path2 = unique_path(o, path, ci->branch2);
55653a68 1269 output(o, 1, _("Renaming %s to %s and %s to %s instead"),
461f5041 1270 a->path, new_path1, b->path, new_path2);
0a6b8712 1271 remove_file(o, 0, path, 0);
b4da9d62 1272 update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, new_path1);
1273 update_file(o, 0, &mfi_c2.oid, mfi_c2.mode, new_path2);
0a6b8712
EN
1274 free(new_path2);
1275 free(new_path1);
1276 }
9047ebbc
MV
1277}
1278
8a2fce18
MV
1279static int process_renames(struct merge_options *o,
1280 struct string_list *a_renames,
1281 struct string_list *b_renames)
9047ebbc
MV
1282{
1283 int clean_merge = 1, i, j;
183113a5
TF
1284 struct string_list a_by_dst = STRING_LIST_INIT_NODUP;
1285 struct string_list b_by_dst = STRING_LIST_INIT_NODUP;
9047ebbc
MV
1286 const struct rename *sre;
1287
1288 for (i = 0; i < a_renames->nr; i++) {
1289 sre = a_renames->items[i].util;
78a395d3 1290 string_list_insert(&a_by_dst, sre->pair->two->path)->util
0a6b8712 1291 = (void *)sre;
9047ebbc
MV
1292 }
1293 for (i = 0; i < b_renames->nr; i++) {
1294 sre = b_renames->items[i].util;
78a395d3 1295 string_list_insert(&b_by_dst, sre->pair->two->path)->util
0a6b8712 1296 = (void *)sre;
9047ebbc
MV
1297 }
1298
1299 for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
8e24cbae 1300 struct string_list *renames1, *renames2Dst;
9047ebbc
MV
1301 struct rename *ren1 = NULL, *ren2 = NULL;
1302 const char *branch1, *branch2;
1303 const char *ren1_src, *ren1_dst;
461f5041 1304 struct string_list_item *lookup;
9047ebbc
MV
1305
1306 if (i >= a_renames->nr) {
9047ebbc
MV
1307 ren2 = b_renames->items[j++].util;
1308 } else if (j >= b_renames->nr) {
9047ebbc
MV
1309 ren1 = a_renames->items[i++].util;
1310 } else {
8e24cbae
BK
1311 int compare = strcmp(a_renames->items[i].string,
1312 b_renames->items[j].string);
9047ebbc
MV
1313 if (compare <= 0)
1314 ren1 = a_renames->items[i++].util;
1315 if (compare >= 0)
1316 ren2 = b_renames->items[j++].util;
1317 }
1318
1319 /* TODO: refactor, so that 1/2 are not needed */
1320 if (ren1) {
1321 renames1 = a_renames;
9047ebbc 1322 renames2Dst = &b_by_dst;
8a2fce18
MV
1323 branch1 = o->branch1;
1324 branch2 = o->branch2;
9047ebbc
MV
1325 } else {
1326 struct rename *tmp;
1327 renames1 = b_renames;
9047ebbc 1328 renames2Dst = &a_by_dst;
8a2fce18
MV
1329 branch1 = o->branch2;
1330 branch2 = o->branch1;
9047ebbc
MV
1331 tmp = ren2;
1332 ren2 = ren1;
1333 ren1 = tmp;
1334 }
9047ebbc 1335
9047ebbc
MV
1336 if (ren1->processed)
1337 continue;
1338 ren1->processed = 1;
9047ebbc 1339 ren1->dst_entry->processed = 1;
7769a75e
EN
1340 /* BUG: We should only mark src_entry as processed if we
1341 * are not dealing with a rename + add-source case.
1342 */
9047ebbc 1343 ren1->src_entry->processed = 1;
9047ebbc
MV
1344
1345 ren1_src = ren1->pair->one->path;
1346 ren1_dst = ren1->pair->two->path;
1347
1348 if (ren2) {
461f5041 1349 /* One file renamed on both sides */
9047ebbc
MV
1350 const char *ren2_src = ren2->pair->one->path;
1351 const char *ren2_dst = ren2->pair->two->path;
4f66dade 1352 enum rename_type rename_type;
9047ebbc 1353 if (strcmp(ren1_src, ren2_src) != 0)
ef1177d1 1354 die("BUG: ren1_src != ren2_src");
9047ebbc
MV
1355 ren2->dst_entry->processed = 1;
1356 ren2->processed = 1;
1357 if (strcmp(ren1_dst, ren2_dst) != 0) {
4f66dade 1358 rename_type = RENAME_ONE_FILE_TO_TWO;
461f5041 1359 clean_merge = 0;
9047ebbc 1360 } else {
4f66dade 1361 rename_type = RENAME_ONE_FILE_TO_ONE;
7769a75e
EN
1362 /* BUG: We should only remove ren1_src in
1363 * the base stage (think of rename +
1364 * add-source cases).
1365 */
b7fa51da 1366 remove_file(o, 1, ren1_src, 1);
b8ddf164
EN
1367 update_entry(ren1->dst_entry,
1368 ren1->pair->one,
1369 ren1->pair->two,
1370 ren2->pair->two);
9047ebbc 1371 }
4f66dade
EN
1372 setup_rename_conflict_info(rename_type,
1373 ren1->pair,
1374 ren2->pair,
1375 branch1,
1376 branch2,
1377 ren1->dst_entry,
232c635f
EN
1378 ren2->dst_entry,
1379 o,
1380 NULL,
1381 NULL);
461f5041
EN
1382 } else if ((lookup = string_list_lookup(renames2Dst, ren1_dst))) {
1383 /* Two different files renamed to the same thing */
1384 char *ren2_dst;
1385 ren2 = lookup->util;
1386 ren2_dst = ren2->pair->two->path;
1387 if (strcmp(ren1_dst, ren2_dst) != 0)
ef1177d1 1388 die("BUG: ren1_dst != ren2_dst");
461f5041
EN
1389
1390 clean_merge = 0;
1391 ren2->processed = 1;
1392 /*
1393 * BUG: We should only mark src_entry as processed
1394 * if we are not dealing with a rename + add-source
1395 * case.
1396 */
1397 ren2->src_entry->processed = 1;
1398
1399 setup_rename_conflict_info(RENAME_TWO_FILES_TO_ONE,
1400 ren1->pair,
1401 ren2->pair,
1402 branch1,
1403 branch2,
1404 ren1->dst_entry,
232c635f
EN
1405 ren2->dst_entry,
1406 o,
1407 ren1->src_entry,
1408 ren2->src_entry);
1409
9047ebbc
MV
1410 } else {
1411 /* Renamed in 1, maybe changed in 2 */
9047ebbc
MV
1412 /* we only use sha1 and mode of these */
1413 struct diff_filespec src_other, dst_other;
41d70bd6 1414 int try_merge;
9047ebbc 1415
41d70bd6
EN
1416 /*
1417 * unpack_trees loads entries from common-commit
1418 * into stage 1, from head-commit into stage 2, and
1419 * from merge-commit into stage 3. We keep track
1420 * of which side corresponds to the rename.
1421 */
1422 int renamed_stage = a_renames == renames1 ? 2 : 3;
1423 int other_stage = a_renames == renames1 ? 3 : 2;
9047ebbc 1424
7769a75e
EN
1425 /* BUG: We should only remove ren1_src in the base
1426 * stage and in other_stage (think of rename +
1427 * add-source case).
1428 */
531357a4
EN
1429 remove_file(o, 1, ren1_src,
1430 renamed_stage == 2 || !was_tracked(ren1_src));
9047ebbc 1431
fd429e98 1432 oidcpy(&src_other.oid,
1433 &ren1->src_entry->stages[other_stage].oid);
41d70bd6 1434 src_other.mode = ren1->src_entry->stages[other_stage].mode;
fd429e98 1435 oidcpy(&dst_other.oid,
1436 &ren1->dst_entry->stages[other_stage].oid);
41d70bd6 1437 dst_other.mode = ren1->dst_entry->stages[other_stage].mode;
9047ebbc
MV
1438 try_merge = 0;
1439
b4da9d62 1440 if (oid_eq(&src_other.oid, &null_oid)) {
4f66dade
EN
1441 setup_rename_conflict_info(RENAME_DELETE,
1442 ren1->pair,
1443 NULL,
1444 branch1,
1445 branch2,
1446 ren1->dst_entry,
232c635f
EN
1447 NULL,
1448 o,
1449 NULL,
4f66dade 1450 NULL);
d5af5105 1451 } else if ((dst_other.mode == ren1->pair->two->mode) &&
b4da9d62 1452 oid_eq(&dst_other.oid, &ren1->pair->two->oid)) {
35a74abf
EN
1453 /*
1454 * Added file on the other side identical to
1455 * the file being renamed: clean merge.
1456 * Also, there is no need to overwrite the
1457 * file already in the working copy, so call
1458 * update_file_flags() instead of
1459 * update_file().
1460 */
1461 update_file_flags(o,
b4da9d62 1462 &ren1->pair->two->oid,
35a74abf
EN
1463 ren1->pair->two->mode,
1464 ren1_dst,
1465 1, /* update_cache */
1466 0 /* update_wd */);
b4da9d62 1467 } else if (!oid_eq(&dst_other.oid, &null_oid)) {
9047ebbc
MV
1468 clean_merge = 0;
1469 try_merge = 1;
55653a68
JX
1470 output(o, 1, _("CONFLICT (rename/add): Rename %s->%s in %s. "
1471 "%s added in %s"),
9047ebbc
MV
1472 ren1_src, ren1_dst, branch1,
1473 ren1_dst, branch2);
c94736a2
JH
1474 if (o->call_depth) {
1475 struct merge_file_info mfi;
b4da9d62 1476 mfi = merge_file_one(o, ren1_dst, &null_oid, 0,
1477 &ren1->pair->two->oid,
a0d12c44 1478 ren1->pair->two->mode,
b4da9d62 1479 &dst_other.oid,
a0d12c44 1480 dst_other.mode,
6bdaead1 1481 branch1, branch2);
55653a68 1482 output(o, 1, _("Adding merged %s"), ren1_dst);
b4da9d62 1483 update_file(o, 0, &mfi.oid,
9b561499 1484 mfi.mode, ren1_dst);
2a669c34 1485 try_merge = 0;
c94736a2 1486 } else {
3d6b8e88 1487 char *new_path = unique_path(o, ren1_dst, branch2);
55653a68 1488 output(o, 1, _("Adding as %s instead"), new_path);
b4da9d62 1489 update_file(o, 0, &dst_other.oid,
a0d12c44 1490 dst_other.mode, new_path);
3d6b8e88 1491 free(new_path);
c94736a2 1492 }
9047ebbc
MV
1493 } else
1494 try_merge = 1;
1495
1496 if (try_merge) {
8a2fce18 1497 struct diff_filespec *one, *a, *b;
9047ebbc
MV
1498 src_other.path = (char *)ren1_src;
1499
8a2fce18 1500 one = ren1->pair->one;
9047ebbc
MV
1501 if (a_renames == renames1) {
1502 a = ren1->pair->two;
1503 b = &src_other;
1504 } else {
1505 b = ren1->pair->two;
1506 a = &src_other;
1507 }
b8ddf164 1508 update_entry(ren1->dst_entry, one, a, b);
4f66dade
EN
1509 setup_rename_conflict_info(RENAME_NORMAL,
1510 ren1->pair,
1511 NULL,
1512 branch1,
1513 NULL,
1514 ren1->dst_entry,
232c635f
EN
1515 NULL,
1516 o,
1517 NULL,
4f66dade 1518 NULL);
9047ebbc
MV
1519 }
1520 }
1521 }
1522 string_list_clear(&a_by_dst, 0);
1523 string_list_clear(&b_by_dst, 0);
1524
1525 return clean_merge;
1526}
1527
b4da9d62 1528static struct object_id *stage_oid(const struct object_id *oid, unsigned mode)
9047ebbc 1529{
b4da9d62 1530 return (is_null_oid(oid) || mode == 0) ? NULL: (struct object_id *)oid;
9047ebbc
MV
1531}
1532
b4da9d62 1533static int read_oid_strbuf(const struct object_id *oid, struct strbuf *dst)
331a1838
EB
1534{
1535 void *buf;
1536 enum object_type type;
1537 unsigned long size;
b4da9d62 1538 buf = read_sha1_file(oid->hash, &type, &size);
331a1838 1539 if (!buf)
b4da9d62 1540 return error(_("cannot read object %s"), oid_to_hex(oid));
331a1838
EB
1541 if (type != OBJ_BLOB) {
1542 free(buf);
b4da9d62 1543 return error(_("object %s is not a blob"), oid_to_hex(oid));
331a1838
EB
1544 }
1545 strbuf_attach(dst, buf, size, size + 1);
1546 return 0;
1547}
1548
b4da9d62 1549static int blob_unchanged(const struct object_id *o_oid,
72fac66b 1550 unsigned o_mode,
b4da9d62 1551 const struct object_id *a_oid,
72fac66b 1552 unsigned a_mode,
3e7589b7 1553 int renormalize, const char *path)
331a1838
EB
1554{
1555 struct strbuf o = STRBUF_INIT;
1556 struct strbuf a = STRBUF_INIT;
1557 int ret = 0; /* assume changed for safety */
1558
72fac66b
JK
1559 if (a_mode != o_mode)
1560 return 0;
b4da9d62 1561 if (oid_eq(o_oid, a_oid))
331a1838 1562 return 1;
3e7589b7 1563 if (!renormalize)
331a1838
EB
1564 return 0;
1565
b4da9d62 1566 assert(o_oid && a_oid);
1567 if (read_oid_strbuf(o_oid, &o) || read_oid_strbuf(a_oid, &a))
331a1838
EB
1568 goto error_return;
1569 /*
1570 * Note: binary | is used so that both renormalizations are
1571 * performed. Comparison can be skipped if both files are
1572 * unchanged since their sha1s have already been compared.
1573 */
1574 if (renormalize_buffer(path, o.buf, o.len, &o) |
422af49c 1575 renormalize_buffer(path, a.buf, a.len, &a))
331a1838
EB
1576 ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len));
1577
1578error_return:
1579 strbuf_release(&o);
1580 strbuf_release(&a);
1581 return ret;
1582}
1583
b7033252 1584static void handle_modify_delete(struct merge_options *o,
5e3ce663 1585 const char *path,
b4da9d62 1586 struct object_id *o_oid, int o_mode,
1587 struct object_id *a_oid, int a_mode,
1588 struct object_id *b_oid, int b_mode)
5e3ce663 1589{
b7033252
EN
1590 handle_change_delete(o,
1591 path,
b4da9d62 1592 o_oid, o_mode,
1593 a_oid, a_mode,
1594 b_oid, b_mode,
55653a68 1595 _("modify"), _("modified"));
5e3ce663
EN
1596}
1597
0c4918d1
EN
1598static int merge_content(struct merge_options *o,
1599 const char *path,
b4da9d62 1600 struct object_id *o_oid, int o_mode,
1601 struct object_id *a_oid, int a_mode,
1602 struct object_id *b_oid, int b_mode,
4f66dade 1603 struct rename_conflict_info *rename_conflict_info)
0c4918d1 1604{
55653a68 1605 const char *reason = _("content");
5b448b85 1606 const char *path1 = NULL, *path2 = NULL;
0c4918d1
EN
1607 struct merge_file_info mfi;
1608 struct diff_filespec one, a, b;
4ab9a157 1609 unsigned df_conflict_remains = 0;
0c4918d1 1610
b4da9d62 1611 if (!o_oid) {
55653a68 1612 reason = _("add/add");
b4da9d62 1613 o_oid = (struct object_id *)&null_oid;
0c4918d1
EN
1614 }
1615 one.path = a.path = b.path = (char *)path;
b4da9d62 1616 oidcpy(&one.oid, o_oid);
0c4918d1 1617 one.mode = o_mode;
b4da9d62 1618 oidcpy(&a.oid, a_oid);
0c4918d1 1619 a.mode = a_mode;
b4da9d62 1620 oidcpy(&b.oid, b_oid);
0c4918d1
EN
1621 b.mode = b_mode;
1622
3c217c07 1623 if (rename_conflict_info) {
3c217c07
EN
1624 struct diff_filepair *pair1 = rename_conflict_info->pair1;
1625
1626 path1 = (o->branch1 == rename_conflict_info->branch1) ?
1627 pair1->two->path : pair1->one->path;
1628 /* If rename_conflict_info->pair2 != NULL, we are in
1629 * RENAME_ONE_FILE_TO_ONE case. Otherwise, we have a
1630 * normal rename.
1631 */
1632 path2 = (rename_conflict_info->pair2 ||
1633 o->branch2 == rename_conflict_info->branch1) ?
1634 pair1->two->path : pair1->one->path;
3c217c07
EN
1635
1636 if (dir_in_way(path, !o->call_depth))
1637 df_conflict_remains = 1;
4ab9a157 1638 }
dac47415
EN
1639 mfi = merge_file_special_markers(o, &one, &a, &b,
1640 o->branch1, path1,
1641 o->branch2, path2);
4ab9a157
EN
1642
1643 if (mfi.clean && !df_conflict_remains &&
b4da9d62 1644 oid_eq(&mfi.oid, a_oid) && mfi.mode == a_mode) {
5b448b85 1645 int path_renamed_outside_HEAD;
55653a68 1646 output(o, 3, _("Skipped %s (merged same as existing)"), path);
5b448b85
EN
1647 /*
1648 * The content merge resulted in the same file contents we
1649 * already had. We can return early if those file contents
1650 * are recorded at the correct path (which may not be true
1651 * if the merge involves a rename).
1652 */
1653 path_renamed_outside_HEAD = !path2 || !strcmp(path, path2);
1654 if (!path_renamed_outside_HEAD) {
b4da9d62 1655 add_cacheinfo(mfi.mode, &mfi.oid, path,
d45b7f40 1656 0, (!o->call_depth), 0);
5b448b85
EN
1657 return mfi.clean;
1658 }
1659 } else
55653a68 1660 output(o, 2, _("Auto-merging %s"), path);
0c4918d1
EN
1661
1662 if (!mfi.clean) {
1663 if (S_ISGITLINK(mfi.mode))
55653a68
JX
1664 reason = _("submodule");
1665 output(o, 1, _("CONFLICT (%s): Merge conflict in %s"),
0c4918d1 1666 reason, path);
4f66dade 1667 if (rename_conflict_info && !df_conflict_remains)
b8ddf164 1668 update_stages(path, &one, &a, &b);
0c4918d1
EN
1669 }
1670
4ab9a157 1671 if (df_conflict_remains) {
3d6b8e88 1672 char *new_path;
51931bf0
EN
1673 if (o->call_depth) {
1674 remove_file_from_cache(path);
1675 } else {
1676 if (!mfi.clean)
1677 update_stages(path, &one, &a, &b);
1678 else {
1679 int file_from_stage2 = was_tracked(path);
1680 struct diff_filespec merged;
9b561499 1681 oidcpy(&merged.oid, &mfi.oid);
51931bf0
EN
1682 merged.mode = mfi.mode;
1683
1684 update_stages(path, NULL,
1685 file_from_stage2 ? &merged : NULL,
1686 file_from_stage2 ? NULL : &merged);
1687 }
1688
1689 }
4f66dade 1690 new_path = unique_path(o, path, rename_conflict_info->branch1);
55653a68 1691 output(o, 1, _("Adding as %s instead"), new_path);
b4da9d62 1692 update_file(o, 0, &mfi.oid, mfi.mode, new_path);
3d6b8e88 1693 free(new_path);
51931bf0 1694 mfi.clean = 0;
4ab9a157 1695 } else {
b4da9d62 1696 update_file(o, mfi.clean, &mfi.oid, mfi.mode, path);
4ab9a157 1697 }
0c4918d1
EN
1698 return mfi.clean;
1699
1700}
1701
9047ebbc 1702/* Per entry merge function */
8a2fce18
MV
1703static int process_entry(struct merge_options *o,
1704 const char *path, struct stage_data *entry)
9047ebbc 1705{
9047ebbc 1706 int clean_merge = 1;
1bc0ab7c 1707 int normalize = o->renormalize;
9047ebbc
MV
1708 unsigned o_mode = entry->stages[1].mode;
1709 unsigned a_mode = entry->stages[2].mode;
1710 unsigned b_mode = entry->stages[3].mode;
b4da9d62 1711 struct object_id *o_oid = stage_oid(&entry->stages[1].oid, o_mode);
1712 struct object_id *a_oid = stage_oid(&entry->stages[2].oid, a_mode);
1713 struct object_id *b_oid = stage_oid(&entry->stages[3].oid, b_mode);
9047ebbc 1714
37348937 1715 entry->processed = 1;
4f66dade
EN
1716 if (entry->rename_conflict_info) {
1717 struct rename_conflict_info *conflict_info = entry->rename_conflict_info;
07413c5a 1718 switch (conflict_info->rename_type) {
882fd11a 1719 case RENAME_NORMAL:
4f66dade 1720 case RENAME_ONE_FILE_TO_ONE:
882fd11a 1721 clean_merge = merge_content(o, path,
b4da9d62 1722 o_oid, o_mode, a_oid, a_mode, b_oid, b_mode,
4f66dade 1723 conflict_info);
882fd11a 1724 break;
3b130adf
EN
1725 case RENAME_DELETE:
1726 clean_merge = 0;
1727 conflict_rename_delete(o, conflict_info->pair1,
1728 conflict_info->branch1,
1729 conflict_info->branch2);
1730 break;
07413c5a 1731 case RENAME_ONE_FILE_TO_TWO:
07413c5a 1732 clean_merge = 0;
a99b7f22 1733 conflict_rename_rename_1to2(o, conflict_info);
07413c5a 1734 break;
461f5041
EN
1735 case RENAME_TWO_FILES_TO_ONE:
1736 clean_merge = 0;
1737 conflict_rename_rename_2to1(o, conflict_info);
07413c5a
EN
1738 break;
1739 default:
1740 entry->processed = 0;
1741 break;
1742 }
b4da9d62 1743 } else if (o_oid && (!a_oid || !b_oid)) {
edd2faf5 1744 /* Case A: Deleted in one */
b4da9d62 1745 if ((!a_oid && !b_oid) ||
1746 (!b_oid && blob_unchanged(o_oid, o_mode, a_oid, a_mode, normalize, path)) ||
1747 (!a_oid && blob_unchanged(o_oid, o_mode, b_oid, b_mode, normalize, path))) {
edd2faf5
EN
1748 /* Deleted in both or deleted in one and
1749 * unchanged in the other */
b4da9d62 1750 if (a_oid)
55653a68 1751 output(o, 2, _("Removing %s"), path);
edd2faf5 1752 /* do not touch working file if it did not exist */
b4da9d62 1753 remove_file(o, 1, path, !a_oid);
edd2faf5
EN
1754 } else {
1755 /* Modify/delete; deleted side may have put a directory in the way */
edd2faf5 1756 clean_merge = 0;
b4da9d62 1757 handle_modify_delete(o, path, o_oid, o_mode,
1758 a_oid, a_mode, b_oid, b_mode);
3d6b8e88 1759 }
b4da9d62 1760 } else if ((!o_oid && a_oid && !b_oid) ||
1761 (!o_oid && !a_oid && b_oid)) {
edd2faf5
EN
1762 /* Case B: Added in one. */
1763 /* [nothing|directory] -> ([nothing|directory], file) */
1764
9c0bbb50
EN
1765 const char *add_branch;
1766 const char *other_branch;
1767 unsigned mode;
b4da9d62 1768 const struct object_id *oid;
9c0bbb50 1769 const char *conf;
37348937 1770
b4da9d62 1771 if (a_oid) {
9c0bbb50
EN
1772 add_branch = o->branch1;
1773 other_branch = o->branch2;
1774 mode = a_mode;
b4da9d62 1775 oid = a_oid;
55653a68 1776 conf = _("file/directory");
9c0bbb50
EN
1777 } else {
1778 add_branch = o->branch2;
1779 other_branch = o->branch1;
1780 mode = b_mode;
b4da9d62 1781 oid = b_oid;
55653a68 1782 conf = _("directory/file");
9c0bbb50 1783 }
f2507b4e 1784 if (dir_in_way(path, !o->call_depth)) {
3d6b8e88 1785 char *new_path = unique_path(o, path, add_branch);
9c0bbb50 1786 clean_merge = 0;
55653a68
JX
1787 output(o, 1, _("CONFLICT (%s): There is a directory with name %s in %s. "
1788 "Adding %s as %s"),
9c0bbb50 1789 conf, path, other_branch, path, new_path);
b4da9d62 1790 update_file(o, 0, oid, mode, new_path);
7b1c610f
EN
1791 if (o->call_depth)
1792 remove_file_from_cache(path);
3d6b8e88 1793 free(new_path);
9c0bbb50 1794 } else {
55653a68 1795 output(o, 2, _("Adding %s"), path);
35a74abf 1796 /* do not overwrite file if already present */
b4da9d62 1797 update_file_flags(o, oid, mode, path, 1, !a_oid);
9c0bbb50 1798 }
b4da9d62 1799 } else if (a_oid && b_oid) {
edd2faf5
EN
1800 /* Case C: Added in both (check for same permissions) and */
1801 /* case D: Modified in both, but differently. */
4f66dade 1802 clean_merge = merge_content(o, path,
b4da9d62 1803 o_oid, o_mode, a_oid, a_mode, b_oid, b_mode,
edd2faf5 1804 NULL);
b4da9d62 1805 } else if (!o_oid && !a_oid && !b_oid) {
edd2faf5
EN
1806 /*
1807 * this entry was deleted altogether. a_mode == 0 means
1808 * we had that path and want to actively remove it.
1809 */
1810 remove_file(o, 1, path, !a_mode);
1811 } else
7e97e100 1812 die("BUG: fatal merge failure, shouldn't happen.");
37348937
EN
1813
1814 return clean_merge;
1815}
1816
8a2fce18
MV
1817int merge_trees(struct merge_options *o,
1818 struct tree *head,
9047ebbc
MV
1819 struct tree *merge,
1820 struct tree *common,
9047ebbc
MV
1821 struct tree **result)
1822{
1823 int code, clean;
1824
85e51b78
JH
1825 if (o->subtree_shift) {
1826 merge = shift_tree_object(head, merge, o->subtree_shift);
1827 common = shift_tree_object(head, common, o->subtree_shift);
9047ebbc
MV
1828 }
1829
b4da9d62 1830 if (oid_eq(&common->object.oid, &merge->object.oid)) {
55653a68 1831 output(o, 0, _("Already up-to-date!"));
9047ebbc
MV
1832 *result = head;
1833 return 1;
1834 }
1835
b7fa51da 1836 code = git_merge_trees(o->call_depth, common, head, merge);
9047ebbc 1837
fadd069d
JH
1838 if (code != 0) {
1839 if (show(o, 4) || o->call_depth)
55653a68 1840 die(_("merging of trees %s and %s failed"),
f2fd0760 1841 oid_to_hex(&head->object.oid),
1842 oid_to_hex(&merge->object.oid));
fadd069d
JH
1843 else
1844 exit(128);
1845 }
9047ebbc
MV
1846
1847 if (unmerged_cache()) {
1848 struct string_list *entries, *re_head, *re_merge;
1849 int i;
696ee23c
MV
1850 string_list_clear(&o->current_file_set, 1);
1851 string_list_clear(&o->current_directory_set, 1);
1852 get_files_dirs(o, head);
1853 get_files_dirs(o, merge);
9047ebbc
MV
1854
1855 entries = get_unmerged();
70cc3d36 1856 record_df_conflict_files(o, entries);
8a2fce18
MV
1857 re_head = get_renames(o, head, common, head, merge, entries);
1858 re_merge = get_renames(o, merge, common, head, merge, entries);
1859 clean = process_renames(o, re_head, re_merge);
edd2faf5 1860 for (i = entries->nr-1; 0 <= i; i--) {
9047ebbc
MV
1861 const char *path = entries->items[i].string;
1862 struct stage_data *e = entries->items[i].util;
1863 if (!e->processed
8a2fce18 1864 && !process_entry(o, path, e))
9047ebbc
MV
1865 clean = 0;
1866 }
7edba4c4
JH
1867 for (i = 0; i < entries->nr; i++) {
1868 struct stage_data *e = entries->items[i].util;
1869 if (!e->processed)
7e97e100 1870 die("BUG: unprocessed path??? %s",
7edba4c4
JH
1871 entries->items[i].string);
1872 }
9047ebbc
MV
1873
1874 string_list_clear(re_merge, 0);
1875 string_list_clear(re_head, 0);
1876 string_list_clear(entries, 1);
1877
473091e2
SB
1878 free(re_merge);
1879 free(re_head);
1880 free(entries);
9047ebbc
MV
1881 }
1882 else
1883 clean = 1;
1884
b7fa51da 1885 if (o->call_depth)
8a2fce18 1886 *result = write_tree_from_memory(o);
9047ebbc
MV
1887
1888 return clean;
1889}
1890
1891static struct commit_list *reverse_commit_list(struct commit_list *list)
1892{
1893 struct commit_list *next = NULL, *current, *backup;
1894 for (current = list; current; current = backup) {
1895 backup = current->next;
1896 current->next = next;
1897 next = current;
1898 }
1899 return next;
1900}
1901
1902/*
1903 * Merge the commits h1 and h2, return the resulting virtual
1904 * commit object and a flag indicating the cleanness of the merge.
1905 */
8a2fce18
MV
1906int merge_recursive(struct merge_options *o,
1907 struct commit *h1,
9047ebbc 1908 struct commit *h2,
9047ebbc
MV
1909 struct commit_list *ca,
1910 struct commit **result)
1911{
1912 struct commit_list *iter;
1913 struct commit *merged_common_ancestors;
1914 struct tree *mrtree = mrtree;
1915 int clean;
1916
8a2fce18 1917 if (show(o, 4)) {
55653a68 1918 output(o, 4, _("Merging:"));
5033639c
MV
1919 output_commit_title(o, h1);
1920 output_commit_title(o, h2);
9047ebbc
MV
1921 }
1922
1923 if (!ca) {
2ce406cc 1924 ca = get_merge_bases(h1, h2);
9047ebbc
MV
1925 ca = reverse_commit_list(ca);
1926 }
1927
8a2fce18 1928 if (show(o, 5)) {
e0453cd8
RT
1929 unsigned cnt = commit_list_count(ca);
1930
1931 output(o, 5, Q_("found %u common ancestor:",
1932 "found %u common ancestors:", cnt), cnt);
9047ebbc 1933 for (iter = ca; iter; iter = iter->next)
5033639c 1934 output_commit_title(o, iter->item);
9047ebbc
MV
1935 }
1936
1937 merged_common_ancestors = pop_commit(&ca);
1938 if (merged_common_ancestors == NULL) {
03f622c8
JN
1939 /* if there is no common ancestor, use an empty tree */
1940 struct tree *tree;
9047ebbc 1941
cba595bd 1942 tree = lookup_tree(EMPTY_TREE_SHA1_BIN);
9047ebbc
MV
1943 merged_common_ancestors = make_virtual_commit(tree, "ancestor");
1944 }
1945
1946 for (iter = ca; iter; iter = iter->next) {
8a2fce18 1947 const char *saved_b1, *saved_b2;
5033639c 1948 o->call_depth++;
9047ebbc
MV
1949 /*
1950 * When the merge fails, the result contains files
1951 * with conflict markers. The cleanness flag is
1952 * ignored, it was never actually used, as result of
1953 * merge_trees has always overwritten it: the committed
1954 * "conflicts" were already resolved.
1955 */
1956 discard_cache();
8a2fce18
MV
1957 saved_b1 = o->branch1;
1958 saved_b2 = o->branch2;
1959 o->branch1 = "Temporary merge branch 1";
1960 o->branch2 = "Temporary merge branch 2";
1961 merge_recursive(o, merged_common_ancestors, iter->item,
1962 NULL, &merged_common_ancestors);
1963 o->branch1 = saved_b1;
1964 o->branch2 = saved_b2;
5033639c 1965 o->call_depth--;
9047ebbc
MV
1966
1967 if (!merged_common_ancestors)
55653a68 1968 die(_("merge returned no commit"));
9047ebbc
MV
1969 }
1970
1971 discard_cache();
b7fa51da 1972 if (!o->call_depth)
9047ebbc 1973 read_cache();
9047ebbc 1974
7ca56aa0 1975 o->ancestor = "merged common ancestors";
8a2fce18
MV
1976 clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
1977 &mrtree);
9047ebbc 1978
b7fa51da 1979 if (o->call_depth) {
9047ebbc
MV
1980 *result = make_virtual_commit(mrtree, "merged tree");
1981 commit_list_insert(h1, &(*result)->parents);
1982 commit_list_insert(h2, &(*result)->parents->next);
1983 }
c7d84924 1984 flush_output(o);
f31027c9
JH
1985 if (show(o, 2))
1986 diff_warn_rename_limit("merge.renamelimit",
1987 o->needed_rename_limit, 0);
9047ebbc
MV
1988 return clean;
1989}
1990
4e8161a8 1991static struct commit *get_ref(const struct object_id *oid, const char *name)
73118f89
SB
1992{
1993 struct object *object;
1994
4e8161a8 1995 object = deref_tag(parse_object(oid->hash), name, strlen(name));
73118f89
SB
1996 if (!object)
1997 return NULL;
1998 if (object->type == OBJ_TREE)
1999 return make_virtual_commit((struct tree*)object, name);
2000 if (object->type != OBJ_COMMIT)
2001 return NULL;
2002 if (parse_commit((struct commit *)object))
2003 return NULL;
2004 return (struct commit *)object;
2005}
2006
8a2fce18 2007int merge_recursive_generic(struct merge_options *o,
4e8161a8 2008 const struct object_id *head,
2009 const struct object_id *merge,
8a2fce18 2010 int num_base_list,
4e8161a8 2011 const struct object_id **base_list,
8a2fce18 2012 struct commit **result)
73118f89 2013{
03b86647 2014 int clean;
73118f89 2015 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
8a2fce18
MV
2016 struct commit *head_commit = get_ref(head, o->branch1);
2017 struct commit *next_commit = get_ref(merge, o->branch2);
73118f89
SB
2018 struct commit_list *ca = NULL;
2019
2020 if (base_list) {
2021 int i;
8a2fce18 2022 for (i = 0; i < num_base_list; ++i) {
73118f89 2023 struct commit *base;
4e8161a8 2024 if (!(base = get_ref(base_list[i], oid_to_hex(base_list[i]))))
55653a68 2025 return error(_("Could not parse object '%s'"),
4e8161a8 2026 oid_to_hex(base_list[i]));
73118f89
SB
2027 commit_list_insert(base, &ca);
2028 }
2029 }
2030
03b86647 2031 hold_locked_index(lock, 1);
8a2fce18
MV
2032 clean = merge_recursive(o, head_commit, next_commit, ca,
2033 result);
73118f89 2034 if (active_cache_changed &&
03b86647 2035 write_locked_index(&the_index, lock, COMMIT_LOCK))
55653a68 2036 return error(_("Unable to write index."));
73118f89
SB
2037
2038 return clean ? 0 : 1;
2039}
2040
0e7bcb1b 2041static void merge_recursive_config(struct merge_options *o)
9047ebbc 2042{
0e7bcb1b
TA
2043 git_config_get_int("merge.verbosity", &o->verbosity);
2044 git_config_get_int("diff.renamelimit", &o->diff_rename_limit);
2045 git_config_get_int("merge.renamelimit", &o->merge_rename_limit);
2046 git_config(git_xmerge_config, NULL);
9047ebbc
MV
2047}
2048
8a2fce18 2049void init_merge_options(struct merge_options *o)
9047ebbc 2050{
8a2fce18
MV
2051 memset(o, 0, sizeof(struct merge_options));
2052 o->verbosity = 2;
2053 o->buffer_output = 1;
2054 o->diff_rename_limit = -1;
2055 o->merge_rename_limit = -1;
7610fa57 2056 o->renormalize = 0;
d2b11eca 2057 o->detect_rename = 1;
0e7bcb1b 2058 merge_recursive_config(o);
9047ebbc 2059 if (getenv("GIT_MERGE_VERBOSITY"))
8a2fce18 2060 o->verbosity =
9047ebbc 2061 strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10);
8a2fce18
MV
2062 if (o->verbosity >= 5)
2063 o->buffer_output = 0;
c7d84924 2064 strbuf_init(&o->obuf, 0);
f93d7c6f
TA
2065 string_list_init(&o->current_file_set, 1);
2066 string_list_init(&o->current_directory_set, 1);
2067 string_list_init(&o->df_conflict_file_set, 1);
9047ebbc 2068}
635a7bb1
JN
2069
2070int parse_merge_opt(struct merge_options *o, const char *s)
2071{
95b567c7
JK
2072 const char *arg;
2073
635a7bb1
JN
2074 if (!s || !*s)
2075 return -1;
2076 if (!strcmp(s, "ours"))
2077 o->recursive_variant = MERGE_RECURSIVE_OURS;
2078 else if (!strcmp(s, "theirs"))
2079 o->recursive_variant = MERGE_RECURSIVE_THEIRS;
2080 else if (!strcmp(s, "subtree"))
2081 o->subtree_shift = "";
95b567c7
JK
2082 else if (skip_prefix(s, "subtree=", &arg))
2083 o->subtree_shift = arg;
58a1ece4 2084 else if (!strcmp(s, "patience"))
307ab20b 2085 o->xdl_opts = DIFF_WITH_ALG(o, PATIENCE_DIFF);
8c912eea 2086 else if (!strcmp(s, "histogram"))
307ab20b 2087 o->xdl_opts = DIFF_WITH_ALG(o, HISTOGRAM_DIFF);
95b567c7
JK
2088 else if (skip_prefix(s, "diff-algorithm=", &arg)) {
2089 long value = parse_algorithm_value(arg);
07924d4d
MP
2090 if (value < 0)
2091 return -1;
2092 /* clear out previous settings */
2093 DIFF_XDL_CLR(o, NEED_MINIMAL);
2094 o->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
2095 o->xdl_opts |= value;
2096 }
4e5dd044
JF
2097 else if (!strcmp(s, "ignore-space-change"))
2098 o->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2099 else if (!strcmp(s, "ignore-all-space"))
2100 o->xdl_opts |= XDF_IGNORE_WHITESPACE;
2101 else if (!strcmp(s, "ignore-space-at-eol"))
2102 o->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
635a7bb1
JN
2103 else if (!strcmp(s, "renormalize"))
2104 o->renormalize = 1;
2105 else if (!strcmp(s, "no-renormalize"))
2106 o->renormalize = 0;
d2b11eca
FGA
2107 else if (!strcmp(s, "no-renames"))
2108 o->detect_rename = 0;
87892f60 2109 else if (!strcmp(s, "find-renames")) {
1b47ad16 2110 o->detect_rename = 1;
87892f60
FGA
2111 o->rename_score = 0;
2112 }
1b47ad16
FGA
2113 else if (skip_prefix(s, "find-renames=", &arg) ||
2114 skip_prefix(s, "rename-threshold=", &arg)) {
95b567c7 2115 if ((o->rename_score = parse_rename_score(&arg)) == -1 || *arg != 0)
10ae7526 2116 return -1;
d2b11eca 2117 o->detect_rename = 1;
10ae7526 2118 }
635a7bb1
JN
2119 else
2120 return -1;
2121 return 0;
2122}