merge-recursive: Make modify/delete handling code reusable
[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
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
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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 {
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MV
92 unsigned mode;
93 unsigned char sha[20];
94 } stages[4];
4f66dade 95 struct rename_conflict_info *rename_conflict_info;
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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;
137 hashcpy(ci->ren1_other.sha1, src_entry1->stages[ostage1].sha);
138 ci->ren1_other.mode = src_entry1->stages[ostage1].mode;
139
140 ci->ren2_other.path = pair2->one->path;
141 hashcpy(ci->ren2_other.sha1, src_entry2->stages[ostage2].sha);
142 ci->ren2_other.mode = src_entry2->stages[ostage2].mode;
143 }
25c39363
EN
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);
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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{
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MV
162 va_list ap;
163
8a2fce18 164 if (!show(o, v))
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MV
165 return;
166
c7d84924
MV
167 strbuf_grow(&o->obuf, o->call_depth * 2 + 2);
168 memset(o->obuf.buf + o->obuf.len, ' ', o->call_depth * 2);
169 strbuf_setlen(&o->obuf, o->obuf.len + o->call_depth * 2);
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170
171 va_start(ap, fmt);
ebeb6090 172 strbuf_vaddf(&o->obuf, fmt, ap);
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173 va_end(ap);
174
c7d84924 175 strbuf_add(&o->obuf, "\n", 1);
8a2fce18 176 if (!o->buffer_output)
c7d84924 177 flush_output(o);
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MV
178}
179
5033639c 180static void output_commit_title(struct merge_options *o, struct commit *commit)
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MV
181{
182 int i;
c7d84924 183 flush_output(o);
5033639c 184 for (i = o->call_depth; i--;)
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MV
185 fputs(" ", stdout);
186 if (commit->util)
187 printf("virtual %s\n", (char *)commit->util);
188 else {
189 printf("%s ", find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV));
190 if (parse_commit(commit) != 0)
191 printf("(bad commit)\n");
192 else {
49b7120e
CC
193 const char *title;
194 int len = find_commit_subject(commit->buffer, &title);
195 if (len)
196 printf("%.*s\n", len, title);
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MV
197 }
198 }
199}
200
201static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
202 const char *path, int stage, int refresh, int options)
203{
204 struct cache_entry *ce;
205 ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage, refresh);
206 if (!ce)
207 return error("addinfo_cache failed for path '%s'", path);
208 return add_cache_entry(ce, options);
209}
210
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MV
211static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree)
212{
213 parse_tree(tree);
214 init_tree_desc(desc, tree->buffer, tree->size);
215}
216
217static int git_merge_trees(int index_only,
218 struct tree *common,
219 struct tree *head,
220 struct tree *merge)
221{
222 int rc;
223 struct tree_desc t[3];
224 struct unpack_trees_options opts;
225
226 memset(&opts, 0, sizeof(opts));
227 if (index_only)
228 opts.index_only = 1;
229 else
230 opts.update = 1;
231 opts.merge = 1;
232 opts.head_idx = 2;
233 opts.fn = threeway_merge;
234 opts.src_index = &the_index;
235 opts.dst_index = &the_index;
e294030f 236 setup_unpack_trees_porcelain(&opts, "merge");
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237
238 init_tree_desc_from_tree(t+0, common);
239 init_tree_desc_from_tree(t+1, head);
240 init_tree_desc_from_tree(t+2, merge);
241
242 rc = unpack_trees(3, t, &opts);
243 cache_tree_free(&active_cache_tree);
244 return rc;
245}
246
8a2fce18 247struct tree *write_tree_from_memory(struct merge_options *o)
9047ebbc
MV
248{
249 struct tree *result = NULL;
250
251 if (unmerged_cache()) {
252 int i;
19c6a4f8 253 fprintf(stderr, "BUG: There are unmerged index entries:\n");
9047ebbc
MV
254 for (i = 0; i < active_nr; i++) {
255 struct cache_entry *ce = active_cache[i];
256 if (ce_stage(ce))
c43ba42e 257 fprintf(stderr, "BUG: %d %.*s\n", ce_stage(ce),
19c6a4f8 258 (int)ce_namelen(ce), ce->name);
9047ebbc 259 }
19c6a4f8 260 die("Bug in merge-recursive.c");
9047ebbc
MV
261 }
262
263 if (!active_cache_tree)
264 active_cache_tree = cache_tree();
265
266 if (!cache_tree_fully_valid(active_cache_tree) &&
267 cache_tree_update(active_cache_tree,
268 active_cache, active_nr, 0, 0) < 0)
269 die("error building trees");
270
271 result = lookup_tree(active_cache_tree->sha1);
272
273 return result;
274}
275
276static int save_files_dirs(const unsigned char *sha1,
277 const char *base, int baselen, const char *path,
278 unsigned int mode, int stage, void *context)
279{
280 int len = strlen(path);
281 char *newpath = xmalloc(baselen + len + 1);
696ee23c
MV
282 struct merge_options *o = context;
283
9047ebbc
MV
284 memcpy(newpath, base, baselen);
285 memcpy(newpath + baselen, path, len);
286 newpath[baselen + len] = '\0';
287
288 if (S_ISDIR(mode))
78a395d3 289 string_list_insert(&o->current_directory_set, newpath);
9047ebbc 290 else
78a395d3 291 string_list_insert(&o->current_file_set, newpath);
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MV
292 free(newpath);
293
d3bee161 294 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
9047ebbc
MV
295}
296
696ee23c 297static int get_files_dirs(struct merge_options *o, struct tree *tree)
9047ebbc
MV
298{
299 int n;
696ee23c 300 if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs, o))
9047ebbc 301 return 0;
696ee23c 302 n = o->current_file_set.nr + o->current_directory_set.nr;
9047ebbc
MV
303 return n;
304}
305
306/*
307 * Returns an index_entry instance which doesn't have to correspond to
308 * a real cache entry in Git's index.
309 */
310static struct stage_data *insert_stage_data(const char *path,
311 struct tree *o, struct tree *a, struct tree *b,
312 struct string_list *entries)
313{
314 struct string_list_item *item;
315 struct stage_data *e = xcalloc(1, sizeof(struct stage_data));
316 get_tree_entry(o->object.sha1, path,
317 e->stages[1].sha, &e->stages[1].mode);
318 get_tree_entry(a->object.sha1, path,
319 e->stages[2].sha, &e->stages[2].mode);
320 get_tree_entry(b->object.sha1, path,
321 e->stages[3].sha, &e->stages[3].mode);
78a395d3 322 item = string_list_insert(entries, path);
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MV
323 item->util = e;
324 return e;
325}
326
327/*
328 * Create a dictionary mapping file names to stage_data objects. The
329 * dictionary contains one entry for every path with a non-zero stage entry.
330 */
331static struct string_list *get_unmerged(void)
332{
333 struct string_list *unmerged = xcalloc(1, sizeof(struct string_list));
334 int i;
335
336 unmerged->strdup_strings = 1;
337
338 for (i = 0; i < active_nr; i++) {
339 struct string_list_item *item;
340 struct stage_data *e;
341 struct cache_entry *ce = active_cache[i];
342 if (!ce_stage(ce))
343 continue;
344
e8c8b713 345 item = string_list_lookup(unmerged, ce->name);
9047ebbc 346 if (!item) {
78a395d3 347 item = string_list_insert(unmerged, ce->name);
9047ebbc
MV
348 item->util = xcalloc(1, sizeof(struct stage_data));
349 }
350 e = item->util;
351 e->stages[ce_stage(ce)].mode = ce->ce_mode;
352 hashcpy(e->stages[ce_stage(ce)].sha, ce->sha1);
353 }
354
355 return unmerged;
356}
357
f0fd4d05
EN
358static int string_list_df_name_compare(const void *a, const void *b)
359{
360 const struct string_list_item *one = a;
361 const struct string_list_item *two = b;
362 int onelen = strlen(one->string);
363 int twolen = strlen(two->string);
364 /*
365 * Here we only care that entries for D/F conflicts are
366 * adjacent, in particular with the file of the D/F conflict
367 * appearing before files below the corresponding directory.
368 * The order of the rest of the list is irrelevant for us.
369 *
370 * To achieve this, we sort with df_name_compare and provide
371 * the mode S_IFDIR so that D/F conflicts will sort correctly.
372 * We use the mode S_IFDIR for everything else for simplicity,
373 * since in other cases any changes in their order due to
374 * sorting cause no problems for us.
375 */
376 int cmp = df_name_compare(one->string, onelen, S_IFDIR,
377 two->string, twolen, S_IFDIR);
378 /*
379 * Now that 'foo' and 'foo/bar' compare equal, we have to make sure
380 * that 'foo' comes before 'foo/bar'.
381 */
382 if (cmp)
383 return cmp;
384 return onelen - twolen;
385}
386
70cc3d36
EN
387static void record_df_conflict_files(struct merge_options *o,
388 struct string_list *entries)
ef02b317 389{
70cc3d36 390 /* If there is a D/F conflict and the file for such a conflict
edd2faf5
EN
391 * currently exist in the working copy, we want to allow it to be
392 * removed to make room for the corresponding directory if needed.
393 * The files underneath the directories of such D/F conflicts will
394 * be processed before the corresponding file involved in the D/F
395 * conflict. If the D/F directory ends up being removed by the
396 * merge, then we won't have to touch the D/F file. If the D/F
397 * directory needs to be written to the working copy, then the D/F
398 * file will simply be removed (in make_room_for_path()) to make
399 * room for the necessary paths. Note that if both the directory
400 * and the file need to be present, then the D/F file will be
401 * reinstated with a new unique name at the time it is processed.
ef02b317
EN
402 */
403 const char *last_file = NULL;
c8516500 404 int last_len = 0;
ef02b317
EN
405 int i;
406
0b30e812
EN
407 /*
408 * If we're merging merge-bases, we don't want to bother with
409 * any working directory changes.
410 */
411 if (o->call_depth)
412 return;
413
f0fd4d05
EN
414 /* Ensure D/F conflicts are adjacent in the entries list. */
415 qsort(entries->items, entries->nr, sizeof(*entries->items),
416 string_list_df_name_compare);
417
70cc3d36 418 string_list_clear(&o->df_conflict_file_set, 1);
ef02b317
EN
419 for (i = 0; i < entries->nr; i++) {
420 const char *path = entries->items[i].string;
421 int len = strlen(path);
422 struct stage_data *e = entries->items[i].util;
423
424 /*
425 * Check if last_file & path correspond to a D/F conflict;
426 * i.e. whether path is last_file+'/'+<something>.
70cc3d36
EN
427 * If so, record that it's okay to remove last_file to make
428 * room for path and friends if needed.
ef02b317
EN
429 */
430 if (last_file &&
431 len > last_len &&
432 memcmp(path, last_file, last_len) == 0 &&
433 path[last_len] == '/') {
70cc3d36 434 string_list_insert(&o->df_conflict_file_set, last_file);
ef02b317
EN
435 }
436
437 /*
438 * Determine whether path could exist as a file in the
439 * working directory as a possible D/F conflict. This
440 * will only occur when it exists in stage 2 as a
441 * file.
442 */
443 if (S_ISREG(e->stages[2].mode) || S_ISLNK(e->stages[2].mode)) {
444 last_file = path;
445 last_len = len;
ef02b317
EN
446 } else {
447 last_file = NULL;
448 }
449 }
450}
451
9cba13ca 452struct rename {
9047ebbc
MV
453 struct diff_filepair *pair;
454 struct stage_data *src_entry;
455 struct stage_data *dst_entry;
456 unsigned processed:1;
457};
458
459/*
460 * Get information of all renames which occurred between 'o_tree' and
461 * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and
462 * 'b_tree') to be able to associate the correct cache entries with
463 * the rename information. 'tree' is always equal to either a_tree or b_tree.
464 */
8a2fce18
MV
465static struct string_list *get_renames(struct merge_options *o,
466 struct tree *tree,
467 struct tree *o_tree,
468 struct tree *a_tree,
469 struct tree *b_tree,
470 struct string_list *entries)
9047ebbc
MV
471{
472 int i;
473 struct string_list *renames;
474 struct diff_options opts;
475
476 renames = xcalloc(1, sizeof(struct string_list));
477 diff_setup(&opts);
478 DIFF_OPT_SET(&opts, RECURSIVE);
479 opts.detect_rename = DIFF_DETECT_RENAME;
8a2fce18
MV
480 opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
481 o->diff_rename_limit >= 0 ? o->diff_rename_limit :
92c57e5c 482 1000;
10ae7526 483 opts.rename_score = o->rename_score;
99bfc669 484 opts.show_rename_progress = o->show_rename_progress;
9047ebbc
MV
485 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
486 if (diff_setup_done(&opts) < 0)
487 die("diff setup failed");
488 diff_tree_sha1(o_tree->object.sha1, tree->object.sha1, "", &opts);
489 diffcore_std(&opts);
bf0ab10f
JK
490 if (opts.needed_rename_limit > o->needed_rename_limit)
491 o->needed_rename_limit = opts.needed_rename_limit;
9047ebbc
MV
492 for (i = 0; i < diff_queued_diff.nr; ++i) {
493 struct string_list_item *item;
494 struct rename *re;
495 struct diff_filepair *pair = diff_queued_diff.queue[i];
496 if (pair->status != 'R') {
497 diff_free_filepair(pair);
498 continue;
499 }
500 re = xmalloc(sizeof(*re));
501 re->processed = 0;
502 re->pair = pair;
e8c8b713 503 item = string_list_lookup(entries, re->pair->one->path);
9047ebbc
MV
504 if (!item)
505 re->src_entry = insert_stage_data(re->pair->one->path,
506 o_tree, a_tree, b_tree, entries);
507 else
508 re->src_entry = item->util;
509
e8c8b713 510 item = string_list_lookup(entries, re->pair->two->path);
9047ebbc
MV
511 if (!item)
512 re->dst_entry = insert_stage_data(re->pair->two->path,
513 o_tree, a_tree, b_tree, entries);
514 else
515 re->dst_entry = item->util;
78a395d3 516 item = string_list_insert(renames, pair->one->path);
9047ebbc
MV
517 item->util = re;
518 }
519 opts.output_format = DIFF_FORMAT_NO_OUTPUT;
520 diff_queued_diff.nr = 0;
521 diff_flush(&opts);
522 return renames;
523}
524
650467cf
EN
525static int update_stages(const char *path, const struct diff_filespec *o,
526 const struct diff_filespec *a,
527 const struct diff_filespec *b)
9047ebbc 528{
650467cf
EN
529 int clear = 1;
530 int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_SKIP_DFCHECK;
9047ebbc
MV
531 if (clear)
532 if (remove_file_from_cache(path))
533 return -1;
534 if (o)
535 if (add_cacheinfo(o->mode, o->sha1, path, 1, 0, options))
536 return -1;
537 if (a)
538 if (add_cacheinfo(a->mode, a->sha1, path, 2, 0, options))
539 return -1;
540 if (b)
541 if (add_cacheinfo(b->mode, b->sha1, path, 3, 0, options))
542 return -1;
543 return 0;
544}
545
b8ddf164
EN
546static void update_entry(struct stage_data *entry,
547 struct diff_filespec *o,
548 struct diff_filespec *a,
549 struct diff_filespec *b)
2ff739f9 550{
2ff739f9
EN
551 entry->processed = 0;
552 entry->stages[1].mode = o->mode;
553 entry->stages[2].mode = a->mode;
554 entry->stages[3].mode = b->mode;
555 hashcpy(entry->stages[1].sha, o->sha1);
556 hashcpy(entry->stages[2].sha, a->sha1);
557 hashcpy(entry->stages[3].sha, b->sha1);
2ff739f9
EN
558}
559
b7fa51da
MV
560static int remove_file(struct merge_options *o, int clean,
561 const char *path, int no_wd)
9047ebbc 562{
b7fa51da
MV
563 int update_cache = o->call_depth || clean;
564 int update_working_directory = !o->call_depth && !no_wd;
9047ebbc
MV
565
566 if (update_cache) {
567 if (remove_file_from_cache(path))
568 return -1;
569 }
570 if (update_working_directory) {
25755e84 571 if (remove_path(path))
9047ebbc 572 return -1;
9047ebbc
MV
573 }
574 return 0;
575}
576
696ee23c 577static char *unique_path(struct merge_options *o, const char *path, const char *branch)
9047ebbc
MV
578{
579 char *newpath = xmalloc(strlen(path) + 1 + strlen(branch) + 8 + 1);
580 int suffix = 0;
581 struct stat st;
582 char *p = newpath + strlen(path);
583 strcpy(newpath, path);
584 *(p++) = '~';
585 strcpy(p, branch);
586 for (; *p; ++p)
587 if ('/' == *p)
588 *p = '_';
696ee23c
MV
589 while (string_list_has_string(&o->current_file_set, newpath) ||
590 string_list_has_string(&o->current_directory_set, newpath) ||
9047ebbc
MV
591 lstat(newpath, &st) == 0)
592 sprintf(p, "_%d", suffix++);
593
78a395d3 594 string_list_insert(&o->current_file_set, newpath);
9047ebbc
MV
595 return newpath;
596}
597
598static void flush_buffer(int fd, const char *buf, unsigned long size)
599{
600 while (size > 0) {
601 long ret = write_in_full(fd, buf, size);
602 if (ret < 0) {
603 /* Ignore epipe */
604 if (errno == EPIPE)
605 break;
d824cbba 606 die_errno("merge-recursive");
9047ebbc
MV
607 } else if (!ret) {
608 die("merge-recursive: disk full?");
609 }
610 size -= ret;
611 buf += ret;
612 }
613}
614
f2507b4e
EN
615static int dir_in_way(const char *path, int check_working_copy)
616{
617 int pos, pathlen = strlen(path);
618 char *dirpath = xmalloc(pathlen + 2);
619 struct stat st;
620
621 strcpy(dirpath, path);
622 dirpath[pathlen] = '/';
623 dirpath[pathlen+1] = '\0';
624
625 pos = cache_name_pos(dirpath, pathlen+1);
626
627 if (pos < 0)
628 pos = -1 - pos;
629 if (pos < active_nr &&
630 !strncmp(dirpath, active_cache[pos]->name, pathlen+1)) {
631 free(dirpath);
632 return 1;
633 }
634
635 free(dirpath);
636 return check_working_copy && !lstat(path, &st) && S_ISDIR(st.st_mode);
637}
638
aacb82de 639static int was_tracked(const char *path)
60c91181
JH
640{
641 int pos = cache_name_pos(path, strlen(path));
642
643 if (pos < 0)
644 pos = -1 - pos;
645 while (pos < active_nr &&
646 !strcmp(path, active_cache[pos]->name)) {
647 /*
648 * If stage #0, it is definitely tracked.
649 * If it has stage #2 then it was tracked
650 * before this merge started. All other
651 * cases the path was not tracked.
652 */
653 switch (ce_stage(active_cache[pos])) {
654 case 0:
655 case 2:
aacb82de 656 return 1;
60c91181
JH
657 }
658 pos++;
659 }
aacb82de
EN
660 return 0;
661}
662
663static int would_lose_untracked(const char *path)
664{
665 return !was_tracked(path) && file_exists(path);
60c91181
JH
666}
667
ed0148a5 668static int make_room_for_path(struct merge_options *o, const char *path)
9047ebbc 669{
ed0148a5 670 int status, i;
9047ebbc
MV
671 const char *msg = "failed to create path '%s'%s";
672
ed0148a5
EN
673 /* Unlink any D/F conflict files that are in the way */
674 for (i = 0; i < o->df_conflict_file_set.nr; i++) {
675 const char *df_path = o->df_conflict_file_set.items[i].string;
676 size_t pathlen = strlen(path);
677 size_t df_pathlen = strlen(df_path);
678 if (df_pathlen < pathlen &&
679 path[df_pathlen] == '/' &&
680 strncmp(path, df_path, df_pathlen) == 0) {
681 output(o, 3,
682 "Removing %s to make room for subdirectory\n",
683 df_path);
684 unlink(df_path);
685 unsorted_string_list_delete_item(&o->df_conflict_file_set,
686 i, 0);
687 break;
688 }
689 }
690
691 /* Make sure leading directories are created */
9047ebbc
MV
692 status = safe_create_leading_directories_const(path);
693 if (status) {
694 if (status == -3) {
695 /* something else exists */
696 error(msg, path, ": perhaps a D/F conflict?");
697 return -1;
698 }
699 die(msg, path, "");
700 }
701
60c91181
JH
702 /*
703 * Do not unlink a file in the work tree if we are not
704 * tracking it.
705 */
706 if (would_lose_untracked(path))
707 return error("refusing to lose untracked file at '%s'",
708 path);
709
9047ebbc
MV
710 /* Successful unlink is good.. */
711 if (!unlink(path))
712 return 0;
713 /* .. and so is no existing file */
714 if (errno == ENOENT)
715 return 0;
716 /* .. but not some other error (who really cares what?) */
717 return error(msg, path, ": perhaps a D/F conflict?");
718}
719
b7fa51da
MV
720static void update_file_flags(struct merge_options *o,
721 const unsigned char *sha,
9047ebbc
MV
722 unsigned mode,
723 const char *path,
724 int update_cache,
725 int update_wd)
726{
b7fa51da 727 if (o->call_depth)
9047ebbc
MV
728 update_wd = 0;
729
730 if (update_wd) {
731 enum object_type type;
732 void *buf;
733 unsigned long size;
734
68d03e4a 735 if (S_ISGITLINK(mode)) {
0c44c943
JH
736 /*
737 * We may later decide to recursively descend into
738 * the submodule directory and update its index
739 * and/or work tree, but we do not do that now.
740 */
68d03e4a 741 update_wd = 0;
0c44c943 742 goto update_index;
68d03e4a 743 }
9047ebbc
MV
744
745 buf = read_sha1_file(sha, &type, &size);
746 if (!buf)
747 die("cannot read object %s '%s'", sha1_to_hex(sha), path);
748 if (type != OBJ_BLOB)
749 die("blob expected for %s '%s'", sha1_to_hex(sha), path);
750 if (S_ISREG(mode)) {
f285a2d7 751 struct strbuf strbuf = STRBUF_INIT;
9047ebbc
MV
752 if (convert_to_working_tree(path, buf, size, &strbuf)) {
753 free(buf);
754 size = strbuf.len;
755 buf = strbuf_detach(&strbuf, NULL);
756 }
757 }
758
ed0148a5 759 if (make_room_for_path(o, path) < 0) {
9047ebbc
MV
760 update_wd = 0;
761 free(buf);
762 goto update_index;
763 }
764 if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) {
765 int fd;
766 if (mode & 0100)
767 mode = 0777;
768 else
769 mode = 0666;
770 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode);
771 if (fd < 0)
d824cbba 772 die_errno("failed to open '%s'", path);
9047ebbc
MV
773 flush_buffer(fd, buf, size);
774 close(fd);
775 } else if (S_ISLNK(mode)) {
776 char *lnk = xmemdupz(buf, size);
777 safe_create_leading_directories_const(path);
778 unlink(path);
304dcf26 779 if (symlink(lnk, path))
d824cbba 780 die_errno("failed to symlink '%s'", path);
9047ebbc
MV
781 free(lnk);
782 } else
783 die("do not know what to do with %06o %s '%s'",
784 mode, sha1_to_hex(sha), path);
785 free(buf);
786 }
787 update_index:
788 if (update_cache)
789 add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD);
790}
791
b7fa51da
MV
792static void update_file(struct merge_options *o,
793 int clean,
9047ebbc
MV
794 const unsigned char *sha,
795 unsigned mode,
796 const char *path)
797{
b7fa51da 798 update_file_flags(o, sha, mode, path, o->call_depth || clean, !o->call_depth);
9047ebbc
MV
799}
800
801/* Low level file merging, update and removal */
802
9cba13ca 803struct merge_file_info {
9047ebbc
MV
804 unsigned char sha[20];
805 unsigned mode;
806 unsigned clean:1,
807 merge:1;
808};
809
b7fa51da
MV
810static int merge_3way(struct merge_options *o,
811 mmbuffer_t *result_buf,
0c059420
EN
812 const struct diff_filespec *one,
813 const struct diff_filespec *a,
814 const struct diff_filespec *b,
9047ebbc
MV
815 const char *branch1,
816 const char *branch2)
817{
818 mmfile_t orig, src1, src2;
712516bc 819 struct ll_merge_options ll_opts = {0};
4c5868f4 820 char *base_name, *name1, *name2;
9047ebbc 821 int merge_status;
8cc5b290 822
712516bc 823 ll_opts.renormalize = o->renormalize;
58a1ece4 824 ll_opts.xdl_opts = o->xdl_opts;
712516bc
JN
825
826 if (o->call_depth) {
827 ll_opts.virtual_ancestor = 1;
828 ll_opts.variant = 0;
829 } else {
8cc5b290
AP
830 switch (o->recursive_variant) {
831 case MERGE_RECURSIVE_OURS:
712516bc 832 ll_opts.variant = XDL_MERGE_FAVOR_OURS;
8cc5b290
AP
833 break;
834 case MERGE_RECURSIVE_THEIRS:
712516bc 835 ll_opts.variant = XDL_MERGE_FAVOR_THEIRS;
8cc5b290
AP
836 break;
837 default:
712516bc 838 ll_opts.variant = 0;
8cc5b290
AP
839 break;
840 }
841 }
9047ebbc 842
4c5868f4
JN
843 if (strcmp(a->path, b->path) ||
844 (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) {
845 base_name = o->ancestor == NULL ? NULL :
846 xstrdup(mkpath("%s:%s", o->ancestor, one->path));
606475f3
MR
847 name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
848 name2 = xstrdup(mkpath("%s:%s", branch2, b->path));
849 } else {
4c5868f4
JN
850 base_name = o->ancestor == NULL ? NULL :
851 xstrdup(mkpath("%s", o->ancestor));
606475f3
MR
852 name1 = xstrdup(mkpath("%s", branch1));
853 name2 = xstrdup(mkpath("%s", branch2));
854 }
9047ebbc 855
06b65939
ML
856 read_mmblob(&orig, one->sha1);
857 read_mmblob(&src1, a->sha1);
858 read_mmblob(&src2, b->sha1);
9047ebbc 859
4c5868f4 860 merge_status = ll_merge(result_buf, a->path, &orig, base_name,
712516bc 861 &src1, name1, &src2, name2, &ll_opts);
9047ebbc
MV
862
863 free(name1);
864 free(name2);
865 free(orig.ptr);
866 free(src1.ptr);
867 free(src2.ptr);
868 return merge_status;
869}
870
6bdaead1
EN
871static struct merge_file_info merge_file_1(struct merge_options *o,
872 const struct diff_filespec *one,
873 const struct diff_filespec *a,
874 const struct diff_filespec *b,
875 const char *branch1,
876 const char *branch2)
9047ebbc
MV
877{
878 struct merge_file_info result;
879 result.merge = 0;
880 result.clean = 1;
881
882 if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) {
883 result.clean = 0;
884 if (S_ISREG(a->mode)) {
885 result.mode = a->mode;
886 hashcpy(result.sha, a->sha1);
887 } else {
888 result.mode = b->mode;
889 hashcpy(result.sha, b->sha1);
890 }
891 } else {
b7fa51da 892 if (!sha_eq(a->sha1, one->sha1) && !sha_eq(b->sha1, one->sha1))
9047ebbc
MV
893 result.merge = 1;
894
895 /*
896 * Merge modes
897 */
b7fa51da 898 if (a->mode == b->mode || a->mode == one->mode)
9047ebbc
MV
899 result.mode = b->mode;
900 else {
901 result.mode = a->mode;
b7fa51da 902 if (b->mode != one->mode) {
9047ebbc
MV
903 result.clean = 0;
904 result.merge = 1;
905 }
906 }
907
b7fa51da 908 if (sha_eq(a->sha1, b->sha1) || sha_eq(a->sha1, one->sha1))
9047ebbc 909 hashcpy(result.sha, b->sha1);
b7fa51da 910 else if (sha_eq(b->sha1, one->sha1))
9047ebbc
MV
911 hashcpy(result.sha, a->sha1);
912 else if (S_ISREG(a->mode)) {
913 mmbuffer_t result_buf;
914 int merge_status;
915
b7fa51da 916 merge_status = merge_3way(o, &result_buf, one, a, b,
9047ebbc
MV
917 branch1, branch2);
918
919 if ((merge_status < 0) || !result_buf.ptr)
920 die("Failed to execute internal merge");
921
922 if (write_sha1_file(result_buf.ptr, result_buf.size,
923 blob_type, result.sha))
924 die("Unable to add %s to database",
925 a->path);
926
927 free(result_buf.ptr);
928 result.clean = (merge_status == 0);
929 } else if (S_ISGITLINK(a->mode)) {
68d03e4a
HV
930 result.clean = merge_submodule(result.sha, one->path, one->sha1,
931 a->sha1, b->sha1);
9047ebbc
MV
932 } else if (S_ISLNK(a->mode)) {
933 hashcpy(result.sha, a->sha1);
934
935 if (!sha_eq(a->sha1, b->sha1))
936 result.clean = 0;
937 } else {
938 die("unsupported object type in the tree");
939 }
940 }
941
942 return result;
943}
944
dac47415
EN
945static struct merge_file_info
946merge_file_special_markers(struct merge_options *o,
947 const struct diff_filespec *one,
948 const struct diff_filespec *a,
949 const struct diff_filespec *b,
950 const char *branch1,
951 const char *filename1,
952 const char *branch2,
953 const char *filename2)
954{
955 char *side1 = NULL;
956 char *side2 = NULL;
957 struct merge_file_info mfi;
958
959 if (filename1) {
960 side1 = xmalloc(strlen(branch1) + strlen(filename1) + 2);
961 sprintf(side1, "%s:%s", branch1, filename1);
962 }
963 if (filename2) {
964 side2 = xmalloc(strlen(branch2) + strlen(filename2) + 2);
965 sprintf(side2, "%s:%s", branch2, filename2);
966 }
967
968 mfi = merge_file_1(o, one, a, b,
969 side1 ? side1 : branch1, side2 ? side2 : branch2);
970 free(side1);
971 free(side2);
972 return mfi;
973}
974
6bdaead1
EN
975static struct merge_file_info merge_file(struct merge_options *o,
976 const char *path,
977 const unsigned char *o_sha, int o_mode,
978 const unsigned char *a_sha, int a_mode,
979 const unsigned char *b_sha, int b_mode,
980 const char *branch1,
981 const char *branch2)
982{
983 struct diff_filespec one, a, b;
984
985 one.path = a.path = b.path = (char *)path;
986 hashcpy(one.sha1, o_sha);
987 one.mode = o_mode;
988 hashcpy(a.sha1, a_sha);
989 a.mode = a_mode;
990 hashcpy(b.sha1, b_sha);
991 b.mode = b_mode;
992 return merge_file_1(o, &one, &a, &b, branch1, branch2);
993}
994
b7033252
EN
995static void handle_change_delete(struct merge_options *o,
996 const char *path,
997 const unsigned char *o_sha, int o_mode,
998 const unsigned char *a_sha, int a_mode,
999 const unsigned char *b_sha, int b_mode,
1000 const char *change, const char *change_past)
1001{
1002 char *renamed = NULL;
1003 if (dir_in_way(path, !o->call_depth)) {
1004 renamed = unique_path(o, path, a_sha ? o->branch1 : o->branch2);
1005 }
1006
1007 if (o->call_depth) {
1008 /*
1009 * We cannot arbitrarily accept either a_sha or b_sha as
1010 * correct; since there is no true "middle point" between
1011 * them, simply reuse the base version for virtual merge base.
1012 */
1013 remove_file_from_cache(path);
1014 update_file(o, 0, o_sha, o_mode, renamed ? renamed : path);
1015 } else if (!a_sha) {
1016 output(o, 1, "CONFLICT (%s/delete): %s deleted in %s "
1017 "and %s in %s. Version %s of %s left in tree%s%s.",
1018 change, path, o->branch1,
1019 change_past, o->branch2, o->branch2, path,
1020 NULL == renamed ? "" : " at ",
1021 NULL == renamed ? "" : renamed);
1022 update_file(o, 0, b_sha, b_mode, renamed ? renamed : path);
1023 } else {
1024 output(o, 1, "CONFLICT (%s/delete): %s deleted in %s "
1025 "and %s in %s. Version %s of %s left in tree%s%s.",
1026 change, path, o->branch2,
1027 change_past, o->branch1, o->branch1, path,
1028 NULL == renamed ? "" : " at ",
1029 NULL == renamed ? "" : renamed);
1030 update_file(o, 0, a_sha, a_mode, renamed ? renamed : path);
1031 }
1032 free(renamed);
1033}
1034
6ef2cb00
EN
1035static void conflict_rename_delete(struct merge_options *o,
1036 struct diff_filepair *pair,
1037 const char *rename_branch,
1038 const char *other_branch)
9047ebbc 1039{
6ef2cb00 1040 char *dest_name = pair->two->path;
a0de2f6b 1041 int df_conflict = 0;
6ef2cb00
EN
1042
1043 output(o, 1, "CONFLICT (rename/delete): Rename %s->%s in %s "
1044 "and deleted in %s",
1045 pair->one->path, pair->two->path, rename_branch,
1046 other_branch);
1047 if (!o->call_depth)
1048 update_stages(dest_name, NULL,
1049 rename_branch == o->branch1 ? pair->two : NULL,
650467cf 1050 rename_branch == o->branch1 ? NULL : pair->two);
f2507b4e 1051 if (dir_in_way(dest_name, !o->call_depth)) {
a0de2f6b
EN
1052 dest_name = unique_path(o, dest_name, rename_branch);
1053 df_conflict = 1;
1054 }
6ef2cb00 1055 update_file(o, 0, pair->two->sha1, pair->two->mode, dest_name);
a0de2f6b
EN
1056 if (df_conflict)
1057 free(dest_name);
6ef2cb00
EN
1058}
1059
09c01f85 1060static void conflict_rename_rename_1to2(struct merge_options *o,
a99b7f22 1061 struct rename_conflict_info *ci)
9047ebbc 1062{
09c01f85 1063 /* One file was renamed in both branches, but to different names. */
a99b7f22
EN
1064 struct diff_filespec *one = ci->pair1->one;
1065 struct diff_filespec *a = ci->pair1->two;
1066 struct diff_filespec *b = ci->pair2->two;
1067 const char *dst_name_a = a->path;
1068 const char *dst_name_b = b->path;
9047ebbc
MV
1069 char *del[2];
1070 int delp = 0;
4f66dade
EN
1071
1072 output(o, 1, "CONFLICT (rename/rename): "
1073 "Rename \"%s\"->\"%s\" in branch \"%s\" "
1074 "rename \"%s\"->\"%s\" in \"%s\"%s",
a99b7f22
EN
1075 one->path, a->path, ci->branch1,
1076 one->path, b->path, ci->branch2,
4f66dade 1077 o->call_depth ? " (left unresolved)" : "");
a99b7f22
EN
1078 if (dir_in_way(a->path, !o->call_depth)) {
1079 dst_name_a = del[delp++] = unique_path(o, a->path, ci->branch1);
8a2fce18 1080 output(o, 1, "%s is a directory in %s adding as %s instead",
a99b7f22 1081 a->path, ci->branch2, dst_name_a);
9047ebbc 1082 }
a99b7f22
EN
1083 if (dir_in_way(b->path, !o->call_depth)) {
1084 dst_name_b = del[delp++] = unique_path(o, b->path, ci->branch2);
8a2fce18 1085 output(o, 1, "%s is a directory in %s adding as %s instead",
a99b7f22 1086 b->path, ci->branch1, dst_name_b);
9047ebbc 1087 }
b7fa51da 1088 if (o->call_depth) {
c52ff85d 1089 struct merge_file_info mfi;
a99b7f22
EN
1090 mfi = merge_file(o, one->path,
1091 one->sha1, one->mode,
1092 a->sha1, a->mode,
1093 b->sha1, b->mode,
1094 ci->branch1, ci->branch2);
9047ebbc 1095 /*
c52ff85d
EN
1096 * FIXME: For rename/add-source conflicts (if we could detect
1097 * such), this is wrong. We should instead find a unique
1098 * pathname and then either rename the add-source file to that
1099 * unique path, or use that unique path instead of src here.
9047ebbc 1100 */
a99b7f22
EN
1101 update_file(o, 0, mfi.sha, mfi.mode, one->path);
1102 remove_file_from_cache(a->path);
1103 remove_file_from_cache(b->path);
9047ebbc 1104 } else {
a99b7f22
EN
1105 update_stages(a->path, NULL, a, NULL);
1106 update_stages(b->path, NULL, NULL, b);
07413c5a 1107
a99b7f22
EN
1108 update_file(o, 0, a->sha1, a->mode, dst_name_a);
1109 update_file(o, 0, b->sha1, b->mode, dst_name_b);
9047ebbc
MV
1110 }
1111 while (delp--)
1112 free(del[delp]);
1113}
1114
09c01f85 1115static void conflict_rename_rename_2to1(struct merge_options *o,
461f5041 1116 struct rename_conflict_info *ci)
9047ebbc 1117{
461f5041
EN
1118 /* Two files, a & b, were renamed to the same thing, c. */
1119 struct diff_filespec *a = ci->pair1->one;
1120 struct diff_filespec *b = ci->pair2->one;
1121 struct diff_filespec *c1 = ci->pair1->two;
1122 struct diff_filespec *c2 = ci->pair2->two;
1123 char *path = c1->path; /* == c2->path */
434b8525
EN
1124 struct merge_file_info mfi_c1;
1125 struct merge_file_info mfi_c2;
461f5041
EN
1126
1127 output(o, 1, "CONFLICT (rename/rename): "
1128 "Rename %s->%s in %s. "
1129 "Rename %s->%s in %s",
1130 a->path, c1->path, ci->branch1,
1131 b->path, c2->path, ci->branch2);
1132
1133 remove_file(o, 1, a->path, would_lose_untracked(a->path));
1134 remove_file(o, 1, b->path, would_lose_untracked(b->path));
1135
434b8525
EN
1136 mfi_c1 = merge_file_special_markers(o, a, c1, &ci->ren1_other,
1137 o->branch1, c1->path,
1138 o->branch2, ci->ren1_other.path);
1139 mfi_c2 = merge_file_special_markers(o, b, &ci->ren2_other, c2,
1140 o->branch1, ci->ren2_other.path,
1141 o->branch2, c2->path);
1142
0a6b8712 1143 if (o->call_depth) {
434b8525
EN
1144 /*
1145 * If mfi_c1.clean && mfi_c2.clean, then it might make
1146 * sense to do a two-way merge of those results. But, I
1147 * think in all cases, it makes sense to have the virtual
1148 * merge base just undo the renames; they can be detected
1149 * again later for the non-recursive merge.
1150 */
1151 remove_file(o, 0, path, 0);
1152 update_file(o, 0, mfi_c1.sha, mfi_c1.mode, a->path);
1153 update_file(o, 0, mfi_c2.sha, mfi_c2.mode, b->path);
0a6b8712 1154 } else {
461f5041
EN
1155 char *new_path1 = unique_path(o, path, ci->branch1);
1156 char *new_path2 = unique_path(o, path, ci->branch2);
0a6b8712 1157 output(o, 1, "Renaming %s to %s and %s to %s instead",
461f5041 1158 a->path, new_path1, b->path, new_path2);
0a6b8712 1159 remove_file(o, 0, path, 0);
434b8525
EN
1160 update_file(o, 0, mfi_c1.sha, mfi_c1.mode, new_path1);
1161 update_file(o, 0, mfi_c2.sha, mfi_c2.mode, new_path2);
0a6b8712
EN
1162 free(new_path2);
1163 free(new_path1);
1164 }
9047ebbc
MV
1165}
1166
8a2fce18
MV
1167static int process_renames(struct merge_options *o,
1168 struct string_list *a_renames,
1169 struct string_list *b_renames)
9047ebbc
MV
1170{
1171 int clean_merge = 1, i, j;
183113a5
TF
1172 struct string_list a_by_dst = STRING_LIST_INIT_NODUP;
1173 struct string_list b_by_dst = STRING_LIST_INIT_NODUP;
9047ebbc
MV
1174 const struct rename *sre;
1175
1176 for (i = 0; i < a_renames->nr; i++) {
1177 sre = a_renames->items[i].util;
78a395d3 1178 string_list_insert(&a_by_dst, sre->pair->two->path)->util
0a6b8712 1179 = (void *)sre;
9047ebbc
MV
1180 }
1181 for (i = 0; i < b_renames->nr; i++) {
1182 sre = b_renames->items[i].util;
78a395d3 1183 string_list_insert(&b_by_dst, sre->pair->two->path)->util
0a6b8712 1184 = (void *)sre;
9047ebbc
MV
1185 }
1186
1187 for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) {
8e24cbae 1188 struct string_list *renames1, *renames2Dst;
9047ebbc
MV
1189 struct rename *ren1 = NULL, *ren2 = NULL;
1190 const char *branch1, *branch2;
1191 const char *ren1_src, *ren1_dst;
461f5041 1192 struct string_list_item *lookup;
9047ebbc
MV
1193
1194 if (i >= a_renames->nr) {
9047ebbc
MV
1195 ren2 = b_renames->items[j++].util;
1196 } else if (j >= b_renames->nr) {
9047ebbc
MV
1197 ren1 = a_renames->items[i++].util;
1198 } else {
8e24cbae
BK
1199 int compare = strcmp(a_renames->items[i].string,
1200 b_renames->items[j].string);
9047ebbc
MV
1201 if (compare <= 0)
1202 ren1 = a_renames->items[i++].util;
1203 if (compare >= 0)
1204 ren2 = b_renames->items[j++].util;
1205 }
1206
1207 /* TODO: refactor, so that 1/2 are not needed */
1208 if (ren1) {
1209 renames1 = a_renames;
9047ebbc 1210 renames2Dst = &b_by_dst;
8a2fce18
MV
1211 branch1 = o->branch1;
1212 branch2 = o->branch2;
9047ebbc
MV
1213 } else {
1214 struct rename *tmp;
1215 renames1 = b_renames;
9047ebbc 1216 renames2Dst = &a_by_dst;
8a2fce18
MV
1217 branch1 = o->branch2;
1218 branch2 = o->branch1;
9047ebbc
MV
1219 tmp = ren2;
1220 ren2 = ren1;
1221 ren1 = tmp;
1222 }
9047ebbc 1223
461f5041
EN
1224 if (ren1->processed)
1225 continue;
1226 ren1->processed = 1;
9047ebbc 1227 ren1->dst_entry->processed = 1;
7769a75e
EN
1228 /* BUG: We should only mark src_entry as processed if we
1229 * are not dealing with a rename + add-source case.
1230 */
9047ebbc
MV
1231 ren1->src_entry->processed = 1;
1232
9047ebbc
MV
1233 ren1_src = ren1->pair->one->path;
1234 ren1_dst = ren1->pair->two->path;
1235
1236 if (ren2) {
461f5041 1237 /* One file renamed on both sides */
9047ebbc
MV
1238 const char *ren2_src = ren2->pair->one->path;
1239 const char *ren2_dst = ren2->pair->two->path;
4f66dade 1240 enum rename_type rename_type;
9047ebbc 1241 if (strcmp(ren1_src, ren2_src) != 0)
461f5041 1242 die("ren1_src != ren2_src");
9047ebbc
MV
1243 ren2->dst_entry->processed = 1;
1244 ren2->processed = 1;
1245 if (strcmp(ren1_dst, ren2_dst) != 0) {
4f66dade 1246 rename_type = RENAME_ONE_FILE_TO_TWO;
461f5041 1247 clean_merge = 0;
9047ebbc 1248 } else {
4f66dade 1249 rename_type = RENAME_ONE_FILE_TO_ONE;
7769a75e
EN
1250 /* BUG: We should only remove ren1_src in
1251 * the base stage (think of rename +
1252 * add-source cases).
1253 */
b7fa51da 1254 remove_file(o, 1, ren1_src, 1);
b8ddf164
EN
1255 update_entry(ren1->dst_entry,
1256 ren1->pair->one,
1257 ren1->pair->two,
1258 ren2->pair->two);
9047ebbc 1259 }
4f66dade
EN
1260 setup_rename_conflict_info(rename_type,
1261 ren1->pair,
1262 ren2->pair,
1263 branch1,
1264 branch2,
1265 ren1->dst_entry,
232c635f
EN
1266 ren2->dst_entry,
1267 o,
1268 NULL,
1269 NULL);
461f5041
EN
1270 } else if ((lookup = string_list_lookup(renames2Dst, ren1_dst))) {
1271 /* Two different files renamed to the same thing */
1272 char *ren2_dst;
1273 ren2 = lookup->util;
1274 ren2_dst = ren2->pair->two->path;
1275 if (strcmp(ren1_dst, ren2_dst) != 0)
1276 die("ren1_dst != ren2_dst");
1277
1278 clean_merge = 0;
1279 ren2->processed = 1;
1280 /*
1281 * BUG: We should only mark src_entry as processed
1282 * if we are not dealing with a rename + add-source
1283 * case.
1284 */
1285 ren2->src_entry->processed = 1;
1286
1287 setup_rename_conflict_info(RENAME_TWO_FILES_TO_ONE,
1288 ren1->pair,
1289 ren2->pair,
1290 branch1,
1291 branch2,
1292 ren1->dst_entry,
232c635f
EN
1293 ren2->dst_entry,
1294 o,
1295 ren1->src_entry,
1296 ren2->src_entry);
1297
9047ebbc
MV
1298 } else {
1299 /* Renamed in 1, maybe changed in 2 */
9047ebbc
MV
1300 /* we only use sha1 and mode of these */
1301 struct diff_filespec src_other, dst_other;
41d70bd6 1302 int try_merge;
9047ebbc 1303
41d70bd6
EN
1304 /*
1305 * unpack_trees loads entries from common-commit
1306 * into stage 1, from head-commit into stage 2, and
1307 * from merge-commit into stage 3. We keep track
1308 * of which side corresponds to the rename.
1309 */
1310 int renamed_stage = a_renames == renames1 ? 2 : 3;
1311 int other_stage = a_renames == renames1 ? 3 : 2;
9047ebbc 1312
7769a75e
EN
1313 /* BUG: We should only remove ren1_src in the base
1314 * stage and in other_stage (think of rename +
1315 * add-source case).
1316 */
531357a4
EN
1317 remove_file(o, 1, ren1_src,
1318 renamed_stage == 2 || !was_tracked(ren1_src));
9047ebbc 1319
41d70bd6
EN
1320 hashcpy(src_other.sha1, ren1->src_entry->stages[other_stage].sha);
1321 src_other.mode = ren1->src_entry->stages[other_stage].mode;
1322 hashcpy(dst_other.sha1, ren1->dst_entry->stages[other_stage].sha);
1323 dst_other.mode = ren1->dst_entry->stages[other_stage].mode;
9047ebbc
MV
1324 try_merge = 0;
1325
86273e57 1326 if (sha_eq(src_other.sha1, null_sha1)) {
4f66dade
EN
1327 setup_rename_conflict_info(RENAME_DELETE,
1328 ren1->pair,
1329 NULL,
1330 branch1,
1331 branch2,
1332 ren1->dst_entry,
232c635f
EN
1333 NULL,
1334 o,
1335 NULL,
4f66dade 1336 NULL);
d5af5105
SK
1337 } else if ((dst_other.mode == ren1->pair->two->mode) &&
1338 sha_eq(dst_other.sha1, ren1->pair->two->sha1)) {
1339 /* Added file on the other side
1340 identical to the file being
1341 renamed: clean merge */
1342 update_file(o, 1, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst);
9047ebbc 1343 } else if (!sha_eq(dst_other.sha1, null_sha1)) {
9047ebbc
MV
1344 clean_merge = 0;
1345 try_merge = 1;
8a2fce18 1346 output(o, 1, "CONFLICT (rename/add): Rename %s->%s in %s. "
9047ebbc
MV
1347 "%s added in %s",
1348 ren1_src, ren1_dst, branch1,
1349 ren1_dst, branch2);
c94736a2
JH
1350 if (o->call_depth) {
1351 struct merge_file_info mfi;
6bdaead1
EN
1352 mfi = merge_file(o, ren1_dst, null_sha1, 0,
1353 ren1->pair->two->sha1, ren1->pair->two->mode,
1354 dst_other.sha1, dst_other.mode,
1355 branch1, branch2);
c94736a2 1356 output(o, 1, "Adding merged %s", ren1_dst);
6bdaead1 1357 update_file(o, 0, mfi.sha, mfi.mode, ren1_dst);
2a669c34 1358 try_merge = 0;
c94736a2 1359 } else {
3d6b8e88 1360 char *new_path = unique_path(o, ren1_dst, branch2);
c94736a2
JH
1361 output(o, 1, "Adding as %s instead", new_path);
1362 update_file(o, 0, dst_other.sha1, dst_other.mode, new_path);
3d6b8e88 1363 free(new_path);
c94736a2 1364 }
9047ebbc
MV
1365 } else
1366 try_merge = 1;
1367
1368 if (try_merge) {
8a2fce18 1369 struct diff_filespec *one, *a, *b;
9047ebbc
MV
1370 src_other.path = (char *)ren1_src;
1371
8a2fce18 1372 one = ren1->pair->one;
9047ebbc
MV
1373 if (a_renames == renames1) {
1374 a = ren1->pair->two;
1375 b = &src_other;
1376 } else {
1377 b = ren1->pair->two;
1378 a = &src_other;
1379 }
b8ddf164 1380 update_entry(ren1->dst_entry, one, a, b);
4f66dade
EN
1381 setup_rename_conflict_info(RENAME_NORMAL,
1382 ren1->pair,
1383 NULL,
1384 branch1,
1385 NULL,
1386 ren1->dst_entry,
232c635f
EN
1387 NULL,
1388 o,
1389 NULL,
4f66dade 1390 NULL);
9047ebbc
MV
1391 }
1392 }
1393 }
1394 string_list_clear(&a_by_dst, 0);
1395 string_list_clear(&b_by_dst, 0);
1396
1397 return clean_merge;
1398}
1399
1400static unsigned char *stage_sha(const unsigned char *sha, unsigned mode)
1401{
1402 return (is_null_sha1(sha) || mode == 0) ? NULL: (unsigned char *)sha;
1403}
1404
331a1838
EB
1405static int read_sha1_strbuf(const unsigned char *sha1, struct strbuf *dst)
1406{
1407 void *buf;
1408 enum object_type type;
1409 unsigned long size;
1410 buf = read_sha1_file(sha1, &type, &size);
1411 if (!buf)
1412 return error("cannot read object %s", sha1_to_hex(sha1));
1413 if (type != OBJ_BLOB) {
1414 free(buf);
1415 return error("object %s is not a blob", sha1_to_hex(sha1));
1416 }
1417 strbuf_attach(dst, buf, size, size + 1);
1418 return 0;
1419}
1420
1421static int blob_unchanged(const unsigned char *o_sha,
1422 const unsigned char *a_sha,
3e7589b7 1423 int renormalize, const char *path)
331a1838
EB
1424{
1425 struct strbuf o = STRBUF_INIT;
1426 struct strbuf a = STRBUF_INIT;
1427 int ret = 0; /* assume changed for safety */
1428
1429 if (sha_eq(o_sha, a_sha))
1430 return 1;
3e7589b7 1431 if (!renormalize)
331a1838
EB
1432 return 0;
1433
1434 assert(o_sha && a_sha);
1435 if (read_sha1_strbuf(o_sha, &o) || read_sha1_strbuf(a_sha, &a))
1436 goto error_return;
1437 /*
1438 * Note: binary | is used so that both renormalizations are
1439 * performed. Comparison can be skipped if both files are
1440 * unchanged since their sha1s have already been compared.
1441 */
1442 if (renormalize_buffer(path, o.buf, o.len, &o) |
1443 renormalize_buffer(path, a.buf, o.len, &a))
1444 ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len));
1445
1446error_return:
1447 strbuf_release(&o);
1448 strbuf_release(&a);
1449 return ret;
1450}
1451
b7033252 1452static void handle_modify_delete(struct merge_options *o,
5e3ce663 1453 const char *path,
ec61d149 1454 unsigned char *o_sha, int o_mode,
5e3ce663
EN
1455 unsigned char *a_sha, int a_mode,
1456 unsigned char *b_sha, int b_mode)
1457{
b7033252
EN
1458 handle_change_delete(o,
1459 path,
1460 o_sha, o_mode,
1461 a_sha, a_mode,
1462 b_sha, b_mode,
1463 "modify", "modified");
5e3ce663
EN
1464}
1465
0c4918d1
EN
1466static int merge_content(struct merge_options *o,
1467 const char *path,
1468 unsigned char *o_sha, int o_mode,
1469 unsigned char *a_sha, int a_mode,
61b8bcae 1470 unsigned char *b_sha, int b_mode,
4f66dade 1471 struct rename_conflict_info *rename_conflict_info)
0c4918d1
EN
1472{
1473 const char *reason = "content";
5b448b85 1474 const char *path1 = NULL, *path2 = NULL;
0c4918d1
EN
1475 struct merge_file_info mfi;
1476 struct diff_filespec one, a, b;
4ab9a157 1477 unsigned df_conflict_remains = 0;
0c4918d1
EN
1478
1479 if (!o_sha) {
1480 reason = "add/add";
1481 o_sha = (unsigned char *)null_sha1;
1482 }
1483 one.path = a.path = b.path = (char *)path;
1484 hashcpy(one.sha1, o_sha);
1485 one.mode = o_mode;
1486 hashcpy(a.sha1, a_sha);
1487 a.mode = a_mode;
1488 hashcpy(b.sha1, b_sha);
1489 b.mode = b_mode;
1490
3c217c07 1491 if (rename_conflict_info) {
3c217c07
EN
1492 struct diff_filepair *pair1 = rename_conflict_info->pair1;
1493
1494 path1 = (o->branch1 == rename_conflict_info->branch1) ?
1495 pair1->two->path : pair1->one->path;
1496 /* If rename_conflict_info->pair2 != NULL, we are in
1497 * RENAME_ONE_FILE_TO_ONE case. Otherwise, we have a
1498 * normal rename.
1499 */
1500 path2 = (rename_conflict_info->pair2 ||
1501 o->branch2 == rename_conflict_info->branch1) ?
1502 pair1->two->path : pair1->one->path;
3c217c07
EN
1503
1504 if (dir_in_way(path, !o->call_depth))
1505 df_conflict_remains = 1;
4ab9a157 1506 }
dac47415
EN
1507 mfi = merge_file_special_markers(o, &one, &a, &b,
1508 o->branch1, path1,
1509 o->branch2, path2);
4ab9a157
EN
1510
1511 if (mfi.clean && !df_conflict_remains &&
5b448b85
EN
1512 sha_eq(mfi.sha, a_sha) && mfi.mode == a_mode) {
1513 int path_renamed_outside_HEAD;
0c4918d1 1514 output(o, 3, "Skipped %s (merged same as existing)", path);
5b448b85
EN
1515 /*
1516 * The content merge resulted in the same file contents we
1517 * already had. We can return early if those file contents
1518 * are recorded at the correct path (which may not be true
1519 * if the merge involves a rename).
1520 */
1521 path_renamed_outside_HEAD = !path2 || !strcmp(path, path2);
1522 if (!path_renamed_outside_HEAD) {
1523 add_cacheinfo(mfi.mode, mfi.sha, path,
1524 0 /*stage*/, 1 /*refresh*/, 0 /*options*/);
1525 return mfi.clean;
1526 }
1527 } else
0c4918d1
EN
1528 output(o, 2, "Auto-merging %s", path);
1529
1530 if (!mfi.clean) {
1531 if (S_ISGITLINK(mfi.mode))
1532 reason = "submodule";
1533 output(o, 1, "CONFLICT (%s): Merge conflict in %s",
1534 reason, path);
4f66dade 1535 if (rename_conflict_info && !df_conflict_remains)
b8ddf164 1536 update_stages(path, &one, &a, &b);
0c4918d1
EN
1537 }
1538
4ab9a157 1539 if (df_conflict_remains) {
3d6b8e88 1540 char *new_path;
51931bf0
EN
1541 if (o->call_depth) {
1542 remove_file_from_cache(path);
1543 } else {
1544 if (!mfi.clean)
1545 update_stages(path, &one, &a, &b);
1546 else {
1547 int file_from_stage2 = was_tracked(path);
1548 struct diff_filespec merged;
1549 hashcpy(merged.sha1, mfi.sha);
1550 merged.mode = mfi.mode;
1551
1552 update_stages(path, NULL,
1553 file_from_stage2 ? &merged : NULL,
1554 file_from_stage2 ? NULL : &merged);
1555 }
1556
1557 }
4f66dade 1558 new_path = unique_path(o, path, rename_conflict_info->branch1);
4ab9a157 1559 output(o, 1, "Adding as %s instead", new_path);
51931bf0 1560 update_file(o, 0, mfi.sha, mfi.mode, new_path);
3d6b8e88 1561 free(new_path);
51931bf0 1562 mfi.clean = 0;
4ab9a157
EN
1563 } else {
1564 update_file(o, mfi.clean, mfi.sha, mfi.mode, path);
1565 }
0c4918d1
EN
1566 return mfi.clean;
1567
1568}
1569
9047ebbc 1570/* Per entry merge function */
8a2fce18
MV
1571static int process_entry(struct merge_options *o,
1572 const char *path, struct stage_data *entry)
9047ebbc
MV
1573{
1574 /*
1575 printf("processing entry, clean cache: %s\n", index_only ? "yes": "no");
1576 print_index_entry("\tpath: ", entry);
1577 */
1578 int clean_merge = 1;
1bc0ab7c 1579 int normalize = o->renormalize;
9047ebbc
MV
1580 unsigned o_mode = entry->stages[1].mode;
1581 unsigned a_mode = entry->stages[2].mode;
1582 unsigned b_mode = entry->stages[3].mode;
1583 unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode);
1584 unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode);
1585 unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode);
1586
37348937 1587 entry->processed = 1;
4f66dade
EN
1588 if (entry->rename_conflict_info) {
1589 struct rename_conflict_info *conflict_info = entry->rename_conflict_info;
07413c5a 1590 switch (conflict_info->rename_type) {
882fd11a 1591 case RENAME_NORMAL:
4f66dade
EN
1592 case RENAME_ONE_FILE_TO_ONE:
1593 clean_merge = merge_content(o, path,
882fd11a 1594 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
4f66dade 1595 conflict_info);
882fd11a 1596 break;
3b130adf
EN
1597 case RENAME_DELETE:
1598 clean_merge = 0;
1599 conflict_rename_delete(o, conflict_info->pair1,
1600 conflict_info->branch1,
1601 conflict_info->branch2);
1602 break;
07413c5a 1603 case RENAME_ONE_FILE_TO_TWO:
07413c5a 1604 clean_merge = 0;
a99b7f22 1605 conflict_rename_rename_1to2(o, conflict_info);
07413c5a 1606 break;
461f5041
EN
1607 case RENAME_TWO_FILES_TO_ONE:
1608 clean_merge = 0;
1609 conflict_rename_rename_2to1(o, conflict_info);
1610 break;
07413c5a
EN
1611 default:
1612 entry->processed = 0;
1613 break;
1614 }
71f7ffcc 1615 } else if (o_sha && (!a_sha || !b_sha)) {
edd2faf5
EN
1616 /* Case A: Deleted in one */
1617 if ((!a_sha && !b_sha) ||
1618 (!b_sha && blob_unchanged(o_sha, a_sha, normalize, path)) ||
1619 (!a_sha && blob_unchanged(o_sha, b_sha, normalize, path))) {
1620 /* Deleted in both or deleted in one and
1621 * unchanged in the other */
1622 if (a_sha)
1623 output(o, 2, "Removing %s", path);
1624 /* do not touch working file if it did not exist */
1625 remove_file(o, 1, path, !a_sha);
1626 } else {
1627 /* Modify/delete; deleted side may have put a directory in the way */
edd2faf5 1628 clean_merge = 0;
b7033252 1629 handle_modify_delete(o, path, o_sha, o_mode,
edd2faf5 1630 a_sha, a_mode, b_sha, b_mode);
3d6b8e88 1631 }
edd2faf5
EN
1632 } else if ((!o_sha && a_sha && !b_sha) ||
1633 (!o_sha && !a_sha && b_sha)) {
1634 /* Case B: Added in one. */
1635 /* [nothing|directory] -> ([nothing|directory], file) */
1636
9c0bbb50
EN
1637 const char *add_branch;
1638 const char *other_branch;
1639 unsigned mode;
1640 const unsigned char *sha;
1641 const char *conf;
37348937 1642
9c0bbb50
EN
1643 if (a_sha) {
1644 add_branch = o->branch1;
1645 other_branch = o->branch2;
1646 mode = a_mode;
1647 sha = a_sha;
1648 conf = "file/directory";
1649 } else {
1650 add_branch = o->branch2;
1651 other_branch = o->branch1;
1652 mode = b_mode;
1653 sha = b_sha;
1654 conf = "directory/file";
1655 }
f2507b4e 1656 if (dir_in_way(path, !o->call_depth)) {
3d6b8e88 1657 char *new_path = unique_path(o, path, add_branch);
9c0bbb50
EN
1658 clean_merge = 0;
1659 output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. "
1660 "Adding %s as %s",
1661 conf, path, other_branch, path, new_path);
51931bf0
EN
1662 if (o->call_depth)
1663 remove_file_from_cache(path);
9c0bbb50 1664 update_file(o, 0, sha, mode, new_path);
7b1c610f
EN
1665 if (o->call_depth)
1666 remove_file_from_cache(path);
3d6b8e88 1667 free(new_path);
9c0bbb50
EN
1668 } else {
1669 output(o, 2, "Adding %s", path);
1670 update_file(o, 1, sha, mode, path);
1671 }
edd2faf5
EN
1672 } else if (a_sha && b_sha) {
1673 /* Case C: Added in both (check for same permissions) and */
1674 /* case D: Modified in both, but differently. */
4f66dade 1675 clean_merge = merge_content(o, path,
edd2faf5
EN
1676 o_sha, o_mode, a_sha, a_mode, b_sha, b_mode,
1677 NULL);
1678 } else if (!o_sha && !a_sha && !b_sha) {
1679 /*
1680 * this entry was deleted altogether. a_mode == 0 means
1681 * we had that path and want to actively remove it.
1682 */
1683 remove_file(o, 1, path, !a_mode);
1684 } else
1685 die("Fatal merge failure, shouldn't happen.");
37348937
EN
1686
1687 return clean_merge;
1688}
1689
8a2fce18
MV
1690int merge_trees(struct merge_options *o,
1691 struct tree *head,
9047ebbc
MV
1692 struct tree *merge,
1693 struct tree *common,
9047ebbc
MV
1694 struct tree **result)
1695{
1696 int code, clean;
1697
85e51b78
JH
1698 if (o->subtree_shift) {
1699 merge = shift_tree_object(head, merge, o->subtree_shift);
1700 common = shift_tree_object(head, common, o->subtree_shift);
9047ebbc
MV
1701 }
1702
1703 if (sha_eq(common->object.sha1, merge->object.sha1)) {
5e5ffa09 1704 output(o, 0, "Already up-to-date!");
9047ebbc
MV
1705 *result = head;
1706 return 1;
1707 }
1708
b7fa51da 1709 code = git_merge_trees(o->call_depth, common, head, merge);
9047ebbc 1710
fadd069d
JH
1711 if (code != 0) {
1712 if (show(o, 4) || o->call_depth)
1713 die("merging of trees %s and %s failed",
1714 sha1_to_hex(head->object.sha1),
1715 sha1_to_hex(merge->object.sha1));
1716 else
1717 exit(128);
1718 }
9047ebbc
MV
1719
1720 if (unmerged_cache()) {
1721 struct string_list *entries, *re_head, *re_merge;
1722 int i;
696ee23c
MV
1723 string_list_clear(&o->current_file_set, 1);
1724 string_list_clear(&o->current_directory_set, 1);
1725 get_files_dirs(o, head);
1726 get_files_dirs(o, merge);
9047ebbc
MV
1727
1728 entries = get_unmerged();
70cc3d36 1729 record_df_conflict_files(o, entries);
8a2fce18
MV
1730 re_head = get_renames(o, head, common, head, merge, entries);
1731 re_merge = get_renames(o, merge, common, head, merge, entries);
1732 clean = process_renames(o, re_head, re_merge);
edd2faf5 1733 for (i = entries->nr-1; 0 <= i; i--) {
9047ebbc
MV
1734 const char *path = entries->items[i].string;
1735 struct stage_data *e = entries->items[i].util;
1736 if (!e->processed
8a2fce18 1737 && !process_entry(o, path, e))
9047ebbc
MV
1738 clean = 0;
1739 }
7edba4c4
JH
1740 for (i = 0; i < entries->nr; i++) {
1741 struct stage_data *e = entries->items[i].util;
1742 if (!e->processed)
1743 die("Unprocessed path??? %s",
1744 entries->items[i].string);
1745 }
9047ebbc
MV
1746
1747 string_list_clear(re_merge, 0);
1748 string_list_clear(re_head, 0);
1749 string_list_clear(entries, 1);
1750
1751 }
1752 else
1753 clean = 1;
1754
b7fa51da 1755 if (o->call_depth)
8a2fce18 1756 *result = write_tree_from_memory(o);
9047ebbc
MV
1757
1758 return clean;
1759}
1760
1761static struct commit_list *reverse_commit_list(struct commit_list *list)
1762{
1763 struct commit_list *next = NULL, *current, *backup;
1764 for (current = list; current; current = backup) {
1765 backup = current->next;
1766 current->next = next;
1767 next = current;
1768 }
1769 return next;
1770}
1771
1772/*
1773 * Merge the commits h1 and h2, return the resulting virtual
1774 * commit object and a flag indicating the cleanness of the merge.
1775 */
8a2fce18
MV
1776int merge_recursive(struct merge_options *o,
1777 struct commit *h1,
9047ebbc 1778 struct commit *h2,
9047ebbc
MV
1779 struct commit_list *ca,
1780 struct commit **result)
1781{
1782 struct commit_list *iter;
1783 struct commit *merged_common_ancestors;
1784 struct tree *mrtree = mrtree;
1785 int clean;
1786
8a2fce18
MV
1787 if (show(o, 4)) {
1788 output(o, 4, "Merging:");
5033639c
MV
1789 output_commit_title(o, h1);
1790 output_commit_title(o, h2);
9047ebbc
MV
1791 }
1792
1793 if (!ca) {
1794 ca = get_merge_bases(h1, h2, 1);
1795 ca = reverse_commit_list(ca);
1796 }
1797
8a2fce18
MV
1798 if (show(o, 5)) {
1799 output(o, 5, "found %u common ancestor(s):", commit_list_count(ca));
9047ebbc 1800 for (iter = ca; iter; iter = iter->next)
5033639c 1801 output_commit_title(o, iter->item);
9047ebbc
MV
1802 }
1803
1804 merged_common_ancestors = pop_commit(&ca);
1805 if (merged_common_ancestors == NULL) {
1806 /* if there is no common ancestor, make an empty tree */
1807 struct tree *tree = xcalloc(1, sizeof(struct tree));
1808
1809 tree->object.parsed = 1;
1810 tree->object.type = OBJ_TREE;
1811 pretend_sha1_file(NULL, 0, OBJ_TREE, tree->object.sha1);
1812 merged_common_ancestors = make_virtual_commit(tree, "ancestor");
1813 }
1814
1815 for (iter = ca; iter; iter = iter->next) {
8a2fce18 1816 const char *saved_b1, *saved_b2;
5033639c 1817 o->call_depth++;
9047ebbc
MV
1818 /*
1819 * When the merge fails, the result contains files
1820 * with conflict markers. The cleanness flag is
1821 * ignored, it was never actually used, as result of
1822 * merge_trees has always overwritten it: the committed
1823 * "conflicts" were already resolved.
1824 */
1825 discard_cache();
8a2fce18
MV
1826 saved_b1 = o->branch1;
1827 saved_b2 = o->branch2;
1828 o->branch1 = "Temporary merge branch 1";
1829 o->branch2 = "Temporary merge branch 2";
1830 merge_recursive(o, merged_common_ancestors, iter->item,
1831 NULL, &merged_common_ancestors);
1832 o->branch1 = saved_b1;
1833 o->branch2 = saved_b2;
5033639c 1834 o->call_depth--;
9047ebbc
MV
1835
1836 if (!merged_common_ancestors)
1837 die("merge returned no commit");
1838 }
1839
1840 discard_cache();
b7fa51da 1841 if (!o->call_depth)
9047ebbc 1842 read_cache();
9047ebbc 1843
7ca56aa0 1844 o->ancestor = "merged common ancestors";
8a2fce18
MV
1845 clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
1846 &mrtree);
9047ebbc 1847
b7fa51da 1848 if (o->call_depth) {
9047ebbc
MV
1849 *result = make_virtual_commit(mrtree, "merged tree");
1850 commit_list_insert(h1, &(*result)->parents);
1851 commit_list_insert(h2, &(*result)->parents->next);
1852 }
c7d84924 1853 flush_output(o);
f31027c9
JH
1854 if (show(o, 2))
1855 diff_warn_rename_limit("merge.renamelimit",
1856 o->needed_rename_limit, 0);
9047ebbc
MV
1857 return clean;
1858}
1859
73118f89
SB
1860static struct commit *get_ref(const unsigned char *sha1, const char *name)
1861{
1862 struct object *object;
1863
1864 object = deref_tag(parse_object(sha1), name, strlen(name));
1865 if (!object)
1866 return NULL;
1867 if (object->type == OBJ_TREE)
1868 return make_virtual_commit((struct tree*)object, name);
1869 if (object->type != OBJ_COMMIT)
1870 return NULL;
1871 if (parse_commit((struct commit *)object))
1872 return NULL;
1873 return (struct commit *)object;
1874}
1875
8a2fce18
MV
1876int merge_recursive_generic(struct merge_options *o,
1877 const unsigned char *head,
1878 const unsigned char *merge,
1879 int num_base_list,
1880 const unsigned char **base_list,
1881 struct commit **result)
73118f89
SB
1882{
1883 int clean, index_fd;
1884 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
8a2fce18
MV
1885 struct commit *head_commit = get_ref(head, o->branch1);
1886 struct commit *next_commit = get_ref(merge, o->branch2);
73118f89
SB
1887 struct commit_list *ca = NULL;
1888
1889 if (base_list) {
1890 int i;
8a2fce18 1891 for (i = 0; i < num_base_list; ++i) {
73118f89 1892 struct commit *base;
8a2fce18 1893 if (!(base = get_ref(base_list[i], sha1_to_hex(base_list[i]))))
73118f89 1894 return error("Could not parse object '%s'",
8a2fce18 1895 sha1_to_hex(base_list[i]));
73118f89
SB
1896 commit_list_insert(base, &ca);
1897 }
1898 }
1899
1900 index_fd = hold_locked_index(lock, 1);
8a2fce18
MV
1901 clean = merge_recursive(o, head_commit, next_commit, ca,
1902 result);
73118f89
SB
1903 if (active_cache_changed &&
1904 (write_cache(index_fd, active_cache, active_nr) ||
1905 commit_locked_index(lock)))
1906 return error("Unable to write index.");
1907
1908 return clean ? 0 : 1;
1909}
1910
8a2fce18 1911static int merge_recursive_config(const char *var, const char *value, void *cb)
9047ebbc 1912{
8a2fce18 1913 struct merge_options *o = cb;
8c2be75f 1914 if (!strcmp(var, "merge.verbosity")) {
8a2fce18 1915 o->verbosity = git_config_int(var, value);
9047ebbc
MV
1916 return 0;
1917 }
8c2be75f 1918 if (!strcmp(var, "diff.renamelimit")) {
8a2fce18 1919 o->diff_rename_limit = git_config_int(var, value);
9047ebbc
MV
1920 return 0;
1921 }
8c2be75f 1922 if (!strcmp(var, "merge.renamelimit")) {
8a2fce18 1923 o->merge_rename_limit = git_config_int(var, value);
9047ebbc
MV
1924 return 0;
1925 }
e137a892 1926 return git_xmerge_config(var, value, cb);
9047ebbc
MV
1927}
1928
8a2fce18 1929void init_merge_options(struct merge_options *o)
9047ebbc 1930{
8a2fce18
MV
1931 memset(o, 0, sizeof(struct merge_options));
1932 o->verbosity = 2;
1933 o->buffer_output = 1;
1934 o->diff_rename_limit = -1;
1935 o->merge_rename_limit = -1;
7610fa57 1936 o->renormalize = 0;
8a2fce18 1937 git_config(merge_recursive_config, o);
9047ebbc 1938 if (getenv("GIT_MERGE_VERBOSITY"))
8a2fce18 1939 o->verbosity =
9047ebbc 1940 strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10);
8a2fce18
MV
1941 if (o->verbosity >= 5)
1942 o->buffer_output = 0;
c7d84924 1943 strbuf_init(&o->obuf, 0);
696ee23c
MV
1944 memset(&o->current_file_set, 0, sizeof(struct string_list));
1945 o->current_file_set.strdup_strings = 1;
1946 memset(&o->current_directory_set, 0, sizeof(struct string_list));
1947 o->current_directory_set.strdup_strings = 1;
70cc3d36
EN
1948 memset(&o->df_conflict_file_set, 0, sizeof(struct string_list));
1949 o->df_conflict_file_set.strdup_strings = 1;
9047ebbc 1950}
635a7bb1
JN
1951
1952int parse_merge_opt(struct merge_options *o, const char *s)
1953{
1954 if (!s || !*s)
1955 return -1;
1956 if (!strcmp(s, "ours"))
1957 o->recursive_variant = MERGE_RECURSIVE_OURS;
1958 else if (!strcmp(s, "theirs"))
1959 o->recursive_variant = MERGE_RECURSIVE_THEIRS;
1960 else if (!strcmp(s, "subtree"))
1961 o->subtree_shift = "";
1962 else if (!prefixcmp(s, "subtree="))
1963 o->subtree_shift = s + strlen("subtree=");
58a1ece4
JF
1964 else if (!strcmp(s, "patience"))
1965 o->xdl_opts |= XDF_PATIENCE_DIFF;
4e5dd044
JF
1966 else if (!strcmp(s, "ignore-space-change"))
1967 o->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
1968 else if (!strcmp(s, "ignore-all-space"))
1969 o->xdl_opts |= XDF_IGNORE_WHITESPACE;
1970 else if (!strcmp(s, "ignore-space-at-eol"))
1971 o->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
635a7bb1
JN
1972 else if (!strcmp(s, "renormalize"))
1973 o->renormalize = 1;
1974 else if (!strcmp(s, "no-renormalize"))
1975 o->renormalize = 0;
10ae7526
KB
1976 else if (!prefixcmp(s, "rename-threshold=")) {
1977 const char *score = s + strlen("rename-threshold=");
1978 if ((o->rename_score = parse_rename_score(&score)) == -1 || *score != 0)
1979 return -1;
1980 }
635a7bb1
JN
1981 else
1982 return -1;
1983 return 0;
1984}