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Commit | Line | Data |
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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" |
9047ebbc | 23 | |
85e51b78 JH |
24 | static struct tree *shift_tree_object(struct tree *one, struct tree *two, |
25 | const char *subtree_shift) | |
9047ebbc MV |
26 | { |
27 | unsigned char shifted[20]; | |
28 | ||
85e51b78 JH |
29 | if (!*subtree_shift) { |
30 | shift_tree(one->object.sha1, two->object.sha1, shifted, 0); | |
31 | } else { | |
32 | shift_tree_by(one->object.sha1, two->object.sha1, shifted, | |
33 | subtree_shift); | |
34 | } | |
9047ebbc MV |
35 | if (!hashcmp(two->object.sha1, shifted)) |
36 | return two; | |
37 | return lookup_tree(shifted); | |
38 | } | |
39 | ||
40 | /* | |
a6f63ae0 | 41 | * A virtual commit has (const char *)commit->util set to the name. |
9047ebbc MV |
42 | */ |
43 | ||
2af202be | 44 | static struct commit *make_virtual_commit(struct tree *tree, const char *comment) |
9047ebbc MV |
45 | { |
46 | struct commit *commit = xcalloc(1, sizeof(struct commit)); | |
9047ebbc MV |
47 | commit->tree = tree; |
48 | commit->util = (void*)comment; | |
9047ebbc MV |
49 | /* avoid warnings */ |
50 | commit->object.parsed = 1; | |
51 | return commit; | |
52 | } | |
53 | ||
54 | /* | |
55 | * Since we use get_tree_entry(), which does not put the read object into | |
56 | * the object pool, we cannot rely on a == b. | |
57 | */ | |
58 | static int sha_eq(const unsigned char *a, const unsigned char *b) | |
59 | { | |
60 | if (!a && !b) | |
61 | return 2; | |
62 | return a && b && hashcmp(a, b) == 0; | |
63 | } | |
64 | ||
65 | /* | |
66 | * Since we want to write the index eventually, we cannot reuse the index | |
67 | * for these (temporary) data. | |
68 | */ | |
69 | struct stage_data | |
70 | { | |
71 | struct | |
72 | { | |
73 | unsigned mode; | |
74 | unsigned char sha[20]; | |
75 | } stages[4]; | |
76 | unsigned processed:1; | |
77 | }; | |
78 | ||
8a2fce18 | 79 | static int show(struct merge_options *o, int v) |
9047ebbc | 80 | { |
5033639c | 81 | return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5; |
9047ebbc MV |
82 | } |
83 | ||
c7d84924 | 84 | static void flush_output(struct merge_options *o) |
9047ebbc | 85 | { |
c7d84924 MV |
86 | if (o->obuf.len) { |
87 | fputs(o->obuf.buf, stdout); | |
88 | strbuf_reset(&o->obuf); | |
9047ebbc MV |
89 | } |
90 | } | |
91 | ||
28bea9e5 | 92 | __attribute__((format (printf, 3, 4))) |
8a2fce18 | 93 | static void output(struct merge_options *o, int v, const char *fmt, ...) |
9047ebbc MV |
94 | { |
95 | int len; | |
96 | va_list ap; | |
97 | ||
8a2fce18 | 98 | if (!show(o, v)) |
9047ebbc MV |
99 | return; |
100 | ||
c7d84924 MV |
101 | strbuf_grow(&o->obuf, o->call_depth * 2 + 2); |
102 | memset(o->obuf.buf + o->obuf.len, ' ', o->call_depth * 2); | |
103 | strbuf_setlen(&o->obuf, o->obuf.len + o->call_depth * 2); | |
9047ebbc MV |
104 | |
105 | va_start(ap, fmt); | |
c7d84924 | 106 | len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap); |
9047ebbc MV |
107 | va_end(ap); |
108 | ||
109 | if (len < 0) | |
110 | len = 0; | |
c7d84924 MV |
111 | if (len >= strbuf_avail(&o->obuf)) { |
112 | strbuf_grow(&o->obuf, len + 2); | |
9047ebbc | 113 | va_start(ap, fmt); |
c7d84924 | 114 | len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap); |
9047ebbc | 115 | va_end(ap); |
c7d84924 | 116 | if (len >= strbuf_avail(&o->obuf)) { |
9047ebbc MV |
117 | die("this should not happen, your snprintf is broken"); |
118 | } | |
119 | } | |
c7d84924 MV |
120 | strbuf_setlen(&o->obuf, o->obuf.len + len); |
121 | strbuf_add(&o->obuf, "\n", 1); | |
8a2fce18 | 122 | if (!o->buffer_output) |
c7d84924 | 123 | flush_output(o); |
9047ebbc MV |
124 | } |
125 | ||
5033639c | 126 | static void output_commit_title(struct merge_options *o, struct commit *commit) |
9047ebbc MV |
127 | { |
128 | int i; | |
c7d84924 | 129 | flush_output(o); |
5033639c | 130 | for (i = o->call_depth; i--;) |
9047ebbc MV |
131 | fputs(" ", stdout); |
132 | if (commit->util) | |
133 | printf("virtual %s\n", (char *)commit->util); | |
134 | else { | |
135 | printf("%s ", find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV)); | |
136 | if (parse_commit(commit) != 0) | |
137 | printf("(bad commit)\n"); | |
138 | else { | |
139 | const char *s; | |
140 | int len; | |
141 | for (s = commit->buffer; *s; s++) | |
142 | if (*s == '\n' && s[1] == '\n') { | |
143 | s += 2; | |
144 | break; | |
145 | } | |
146 | for (len = 0; s[len] && '\n' != s[len]; len++) | |
147 | ; /* do nothing */ | |
148 | printf("%.*s\n", len, s); | |
149 | } | |
150 | } | |
151 | } | |
152 | ||
153 | static int add_cacheinfo(unsigned int mode, const unsigned char *sha1, | |
154 | const char *path, int stage, int refresh, int options) | |
155 | { | |
156 | struct cache_entry *ce; | |
157 | ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage, refresh); | |
158 | if (!ce) | |
159 | return error("addinfo_cache failed for path '%s'", path); | |
160 | return add_cache_entry(ce, options); | |
161 | } | |
162 | ||
9047ebbc MV |
163 | static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree) |
164 | { | |
165 | parse_tree(tree); | |
166 | init_tree_desc(desc, tree->buffer, tree->size); | |
167 | } | |
168 | ||
169 | static int git_merge_trees(int index_only, | |
170 | struct tree *common, | |
171 | struct tree *head, | |
172 | struct tree *merge) | |
173 | { | |
174 | int rc; | |
175 | struct tree_desc t[3]; | |
176 | struct unpack_trees_options opts; | |
177 | ||
178 | memset(&opts, 0, sizeof(opts)); | |
179 | if (index_only) | |
180 | opts.index_only = 1; | |
181 | else | |
182 | opts.update = 1; | |
183 | opts.merge = 1; | |
184 | opts.head_idx = 2; | |
185 | opts.fn = threeway_merge; | |
186 | opts.src_index = &the_index; | |
187 | opts.dst_index = &the_index; | |
264b774b | 188 | opts.msgs = get_porcelain_error_msgs(); |
9047ebbc MV |
189 | |
190 | init_tree_desc_from_tree(t+0, common); | |
191 | init_tree_desc_from_tree(t+1, head); | |
192 | init_tree_desc_from_tree(t+2, merge); | |
193 | ||
194 | rc = unpack_trees(3, t, &opts); | |
195 | cache_tree_free(&active_cache_tree); | |
196 | return rc; | |
197 | } | |
198 | ||
8a2fce18 | 199 | struct tree *write_tree_from_memory(struct merge_options *o) |
9047ebbc MV |
200 | { |
201 | struct tree *result = NULL; | |
202 | ||
203 | if (unmerged_cache()) { | |
204 | int i; | |
19c6a4f8 | 205 | fprintf(stderr, "BUG: There are unmerged index entries:\n"); |
9047ebbc MV |
206 | for (i = 0; i < active_nr; i++) { |
207 | struct cache_entry *ce = active_cache[i]; | |
208 | if (ce_stage(ce)) | |
19c6a4f8 JH |
209 | fprintf(stderr, "BUG: %d %.*s", ce_stage(ce), |
210 | (int)ce_namelen(ce), ce->name); | |
9047ebbc | 211 | } |
19c6a4f8 | 212 | die("Bug in merge-recursive.c"); |
9047ebbc MV |
213 | } |
214 | ||
215 | if (!active_cache_tree) | |
216 | active_cache_tree = cache_tree(); | |
217 | ||
218 | if (!cache_tree_fully_valid(active_cache_tree) && | |
219 | cache_tree_update(active_cache_tree, | |
220 | active_cache, active_nr, 0, 0) < 0) | |
221 | die("error building trees"); | |
222 | ||
223 | result = lookup_tree(active_cache_tree->sha1); | |
224 | ||
225 | return result; | |
226 | } | |
227 | ||
228 | static int save_files_dirs(const unsigned char *sha1, | |
229 | const char *base, int baselen, const char *path, | |
230 | unsigned int mode, int stage, void *context) | |
231 | { | |
232 | int len = strlen(path); | |
233 | char *newpath = xmalloc(baselen + len + 1); | |
696ee23c MV |
234 | struct merge_options *o = context; |
235 | ||
9047ebbc MV |
236 | memcpy(newpath, base, baselen); |
237 | memcpy(newpath + baselen, path, len); | |
238 | newpath[baselen + len] = '\0'; | |
239 | ||
240 | if (S_ISDIR(mode)) | |
696ee23c | 241 | string_list_insert(newpath, &o->current_directory_set); |
9047ebbc | 242 | else |
696ee23c | 243 | string_list_insert(newpath, &o->current_file_set); |
9047ebbc MV |
244 | free(newpath); |
245 | ||
d3bee161 | 246 | return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0); |
9047ebbc MV |
247 | } |
248 | ||
696ee23c | 249 | static int get_files_dirs(struct merge_options *o, struct tree *tree) |
9047ebbc MV |
250 | { |
251 | int n; | |
696ee23c | 252 | if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs, o)) |
9047ebbc | 253 | return 0; |
696ee23c | 254 | n = o->current_file_set.nr + o->current_directory_set.nr; |
9047ebbc MV |
255 | return n; |
256 | } | |
257 | ||
258 | /* | |
259 | * Returns an index_entry instance which doesn't have to correspond to | |
260 | * a real cache entry in Git's index. | |
261 | */ | |
262 | static struct stage_data *insert_stage_data(const char *path, | |
263 | struct tree *o, struct tree *a, struct tree *b, | |
264 | struct string_list *entries) | |
265 | { | |
266 | struct string_list_item *item; | |
267 | struct stage_data *e = xcalloc(1, sizeof(struct stage_data)); | |
268 | get_tree_entry(o->object.sha1, path, | |
269 | e->stages[1].sha, &e->stages[1].mode); | |
270 | get_tree_entry(a->object.sha1, path, | |
271 | e->stages[2].sha, &e->stages[2].mode); | |
272 | get_tree_entry(b->object.sha1, path, | |
273 | e->stages[3].sha, &e->stages[3].mode); | |
274 | item = string_list_insert(path, entries); | |
275 | item->util = e; | |
276 | return e; | |
277 | } | |
278 | ||
279 | /* | |
280 | * Create a dictionary mapping file names to stage_data objects. The | |
281 | * dictionary contains one entry for every path with a non-zero stage entry. | |
282 | */ | |
283 | static struct string_list *get_unmerged(void) | |
284 | { | |
285 | struct string_list *unmerged = xcalloc(1, sizeof(struct string_list)); | |
286 | int i; | |
287 | ||
288 | unmerged->strdup_strings = 1; | |
289 | ||
290 | for (i = 0; i < active_nr; i++) { | |
291 | struct string_list_item *item; | |
292 | struct stage_data *e; | |
293 | struct cache_entry *ce = active_cache[i]; | |
294 | if (!ce_stage(ce)) | |
295 | continue; | |
296 | ||
297 | item = string_list_lookup(ce->name, unmerged); | |
298 | if (!item) { | |
299 | item = string_list_insert(ce->name, unmerged); | |
300 | item->util = xcalloc(1, sizeof(struct stage_data)); | |
301 | } | |
302 | e = item->util; | |
303 | e->stages[ce_stage(ce)].mode = ce->ce_mode; | |
304 | hashcpy(e->stages[ce_stage(ce)].sha, ce->sha1); | |
305 | } | |
306 | ||
307 | return unmerged; | |
308 | } | |
309 | ||
310 | struct rename | |
311 | { | |
312 | struct diff_filepair *pair; | |
313 | struct stage_data *src_entry; | |
314 | struct stage_data *dst_entry; | |
315 | unsigned processed:1; | |
316 | }; | |
317 | ||
318 | /* | |
319 | * Get information of all renames which occurred between 'o_tree' and | |
320 | * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and | |
321 | * 'b_tree') to be able to associate the correct cache entries with | |
322 | * the rename information. 'tree' is always equal to either a_tree or b_tree. | |
323 | */ | |
8a2fce18 MV |
324 | static struct string_list *get_renames(struct merge_options *o, |
325 | struct tree *tree, | |
326 | struct tree *o_tree, | |
327 | struct tree *a_tree, | |
328 | struct tree *b_tree, | |
329 | struct string_list *entries) | |
9047ebbc MV |
330 | { |
331 | int i; | |
332 | struct string_list *renames; | |
333 | struct diff_options opts; | |
334 | ||
335 | renames = xcalloc(1, sizeof(struct string_list)); | |
336 | diff_setup(&opts); | |
337 | DIFF_OPT_SET(&opts, RECURSIVE); | |
338 | opts.detect_rename = DIFF_DETECT_RENAME; | |
8a2fce18 MV |
339 | opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit : |
340 | o->diff_rename_limit >= 0 ? o->diff_rename_limit : | |
9047ebbc MV |
341 | 500; |
342 | opts.warn_on_too_large_rename = 1; | |
343 | opts.output_format = DIFF_FORMAT_NO_OUTPUT; | |
344 | if (diff_setup_done(&opts) < 0) | |
345 | die("diff setup failed"); | |
346 | diff_tree_sha1(o_tree->object.sha1, tree->object.sha1, "", &opts); | |
347 | diffcore_std(&opts); | |
348 | for (i = 0; i < diff_queued_diff.nr; ++i) { | |
349 | struct string_list_item *item; | |
350 | struct rename *re; | |
351 | struct diff_filepair *pair = diff_queued_diff.queue[i]; | |
352 | if (pair->status != 'R') { | |
353 | diff_free_filepair(pair); | |
354 | continue; | |
355 | } | |
356 | re = xmalloc(sizeof(*re)); | |
357 | re->processed = 0; | |
358 | re->pair = pair; | |
359 | item = string_list_lookup(re->pair->one->path, entries); | |
360 | if (!item) | |
361 | re->src_entry = insert_stage_data(re->pair->one->path, | |
362 | o_tree, a_tree, b_tree, entries); | |
363 | else | |
364 | re->src_entry = item->util; | |
365 | ||
366 | item = string_list_lookup(re->pair->two->path, entries); | |
367 | if (!item) | |
368 | re->dst_entry = insert_stage_data(re->pair->two->path, | |
369 | o_tree, a_tree, b_tree, entries); | |
370 | else | |
371 | re->dst_entry = item->util; | |
372 | item = string_list_insert(pair->one->path, renames); | |
373 | item->util = re; | |
374 | } | |
375 | opts.output_format = DIFF_FORMAT_NO_OUTPUT; | |
376 | diff_queued_diff.nr = 0; | |
377 | diff_flush(&opts); | |
378 | return renames; | |
379 | } | |
380 | ||
381 | static int update_stages(const char *path, struct diff_filespec *o, | |
382 | struct diff_filespec *a, struct diff_filespec *b, | |
383 | int clear) | |
384 | { | |
385 | int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE; | |
386 | if (clear) | |
387 | if (remove_file_from_cache(path)) | |
388 | return -1; | |
389 | if (o) | |
390 | if (add_cacheinfo(o->mode, o->sha1, path, 1, 0, options)) | |
391 | return -1; | |
392 | if (a) | |
393 | if (add_cacheinfo(a->mode, a->sha1, path, 2, 0, options)) | |
394 | return -1; | |
395 | if (b) | |
396 | if (add_cacheinfo(b->mode, b->sha1, path, 3, 0, options)) | |
397 | return -1; | |
398 | return 0; | |
399 | } | |
400 | ||
b7fa51da MV |
401 | static int remove_file(struct merge_options *o, int clean, |
402 | const char *path, int no_wd) | |
9047ebbc | 403 | { |
b7fa51da MV |
404 | int update_cache = o->call_depth || clean; |
405 | int update_working_directory = !o->call_depth && !no_wd; | |
9047ebbc MV |
406 | |
407 | if (update_cache) { | |
408 | if (remove_file_from_cache(path)) | |
409 | return -1; | |
410 | } | |
411 | if (update_working_directory) { | |
25755e84 | 412 | if (remove_path(path)) |
9047ebbc | 413 | return -1; |
9047ebbc MV |
414 | } |
415 | return 0; | |
416 | } | |
417 | ||
696ee23c | 418 | static char *unique_path(struct merge_options *o, const char *path, const char *branch) |
9047ebbc MV |
419 | { |
420 | char *newpath = xmalloc(strlen(path) + 1 + strlen(branch) + 8 + 1); | |
421 | int suffix = 0; | |
422 | struct stat st; | |
423 | char *p = newpath + strlen(path); | |
424 | strcpy(newpath, path); | |
425 | *(p++) = '~'; | |
426 | strcpy(p, branch); | |
427 | for (; *p; ++p) | |
428 | if ('/' == *p) | |
429 | *p = '_'; | |
696ee23c MV |
430 | while (string_list_has_string(&o->current_file_set, newpath) || |
431 | string_list_has_string(&o->current_directory_set, newpath) || | |
9047ebbc MV |
432 | lstat(newpath, &st) == 0) |
433 | sprintf(p, "_%d", suffix++); | |
434 | ||
696ee23c | 435 | string_list_insert(newpath, &o->current_file_set); |
9047ebbc MV |
436 | return newpath; |
437 | } | |
438 | ||
439 | static void flush_buffer(int fd, const char *buf, unsigned long size) | |
440 | { | |
441 | while (size > 0) { | |
442 | long ret = write_in_full(fd, buf, size); | |
443 | if (ret < 0) { | |
444 | /* Ignore epipe */ | |
445 | if (errno == EPIPE) | |
446 | break; | |
d824cbba | 447 | die_errno("merge-recursive"); |
9047ebbc MV |
448 | } else if (!ret) { |
449 | die("merge-recursive: disk full?"); | |
450 | } | |
451 | size -= ret; | |
452 | buf += ret; | |
453 | } | |
454 | } | |
455 | ||
60c91181 JH |
456 | static int would_lose_untracked(const char *path) |
457 | { | |
458 | int pos = cache_name_pos(path, strlen(path)); | |
459 | ||
460 | if (pos < 0) | |
461 | pos = -1 - pos; | |
462 | while (pos < active_nr && | |
463 | !strcmp(path, active_cache[pos]->name)) { | |
464 | /* | |
465 | * If stage #0, it is definitely tracked. | |
466 | * If it has stage #2 then it was tracked | |
467 | * before this merge started. All other | |
468 | * cases the path was not tracked. | |
469 | */ | |
470 | switch (ce_stage(active_cache[pos])) { | |
471 | case 0: | |
472 | case 2: | |
473 | return 0; | |
474 | } | |
475 | pos++; | |
476 | } | |
477 | return file_exists(path); | |
478 | } | |
479 | ||
9047ebbc MV |
480 | static int make_room_for_path(const char *path) |
481 | { | |
482 | int status; | |
483 | const char *msg = "failed to create path '%s'%s"; | |
484 | ||
485 | status = safe_create_leading_directories_const(path); | |
486 | if (status) { | |
487 | if (status == -3) { | |
488 | /* something else exists */ | |
489 | error(msg, path, ": perhaps a D/F conflict?"); | |
490 | return -1; | |
491 | } | |
492 | die(msg, path, ""); | |
493 | } | |
494 | ||
60c91181 JH |
495 | /* |
496 | * Do not unlink a file in the work tree if we are not | |
497 | * tracking it. | |
498 | */ | |
499 | if (would_lose_untracked(path)) | |
500 | return error("refusing to lose untracked file at '%s'", | |
501 | path); | |
502 | ||
9047ebbc MV |
503 | /* Successful unlink is good.. */ |
504 | if (!unlink(path)) | |
505 | return 0; | |
506 | /* .. and so is no existing file */ | |
507 | if (errno == ENOENT) | |
508 | return 0; | |
509 | /* .. but not some other error (who really cares what?) */ | |
510 | return error(msg, path, ": perhaps a D/F conflict?"); | |
511 | } | |
512 | ||
b7fa51da MV |
513 | static void update_file_flags(struct merge_options *o, |
514 | const unsigned char *sha, | |
9047ebbc MV |
515 | unsigned mode, |
516 | const char *path, | |
517 | int update_cache, | |
518 | int update_wd) | |
519 | { | |
b7fa51da | 520 | if (o->call_depth) |
9047ebbc MV |
521 | update_wd = 0; |
522 | ||
523 | if (update_wd) { | |
524 | enum object_type type; | |
525 | void *buf; | |
526 | unsigned long size; | |
527 | ||
528 | if (S_ISGITLINK(mode)) | |
0c44c943 JH |
529 | /* |
530 | * We may later decide to recursively descend into | |
531 | * the submodule directory and update its index | |
532 | * and/or work tree, but we do not do that now. | |
533 | */ | |
534 | goto update_index; | |
9047ebbc MV |
535 | |
536 | buf = read_sha1_file(sha, &type, &size); | |
537 | if (!buf) | |
538 | die("cannot read object %s '%s'", sha1_to_hex(sha), path); | |
539 | if (type != OBJ_BLOB) | |
540 | die("blob expected for %s '%s'", sha1_to_hex(sha), path); | |
541 | if (S_ISREG(mode)) { | |
f285a2d7 | 542 | struct strbuf strbuf = STRBUF_INIT; |
9047ebbc MV |
543 | if (convert_to_working_tree(path, buf, size, &strbuf)) { |
544 | free(buf); | |
545 | size = strbuf.len; | |
546 | buf = strbuf_detach(&strbuf, NULL); | |
547 | } | |
548 | } | |
549 | ||
550 | if (make_room_for_path(path) < 0) { | |
551 | update_wd = 0; | |
552 | free(buf); | |
553 | goto update_index; | |
554 | } | |
555 | if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) { | |
556 | int fd; | |
557 | if (mode & 0100) | |
558 | mode = 0777; | |
559 | else | |
560 | mode = 0666; | |
561 | fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode); | |
562 | if (fd < 0) | |
d824cbba | 563 | die_errno("failed to open '%s'", path); |
9047ebbc MV |
564 | flush_buffer(fd, buf, size); |
565 | close(fd); | |
566 | } else if (S_ISLNK(mode)) { | |
567 | char *lnk = xmemdupz(buf, size); | |
568 | safe_create_leading_directories_const(path); | |
569 | unlink(path); | |
304dcf26 | 570 | if (symlink(lnk, path)) |
d824cbba | 571 | die_errno("failed to symlink '%s'", path); |
9047ebbc MV |
572 | free(lnk); |
573 | } else | |
574 | die("do not know what to do with %06o %s '%s'", | |
575 | mode, sha1_to_hex(sha), path); | |
576 | free(buf); | |
577 | } | |
578 | update_index: | |
579 | if (update_cache) | |
580 | add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD); | |
581 | } | |
582 | ||
b7fa51da MV |
583 | static void update_file(struct merge_options *o, |
584 | int clean, | |
9047ebbc MV |
585 | const unsigned char *sha, |
586 | unsigned mode, | |
587 | const char *path) | |
588 | { | |
b7fa51da | 589 | update_file_flags(o, sha, mode, path, o->call_depth || clean, !o->call_depth); |
9047ebbc MV |
590 | } |
591 | ||
592 | /* Low level file merging, update and removal */ | |
593 | ||
594 | struct merge_file_info | |
595 | { | |
596 | unsigned char sha[20]; | |
597 | unsigned mode; | |
598 | unsigned clean:1, | |
599 | merge:1; | |
600 | }; | |
601 | ||
b7fa51da MV |
602 | static int merge_3way(struct merge_options *o, |
603 | mmbuffer_t *result_buf, | |
604 | struct diff_filespec *one, | |
9047ebbc MV |
605 | struct diff_filespec *a, |
606 | struct diff_filespec *b, | |
607 | const char *branch1, | |
608 | const char *branch2) | |
609 | { | |
610 | mmfile_t orig, src1, src2; | |
4c5868f4 | 611 | char *base_name, *name1, *name2; |
9047ebbc | 612 | int merge_status; |
8cc5b290 AP |
613 | int favor; |
614 | ||
615 | if (o->call_depth) | |
616 | favor = 0; | |
617 | else { | |
618 | switch (o->recursive_variant) { | |
619 | case MERGE_RECURSIVE_OURS: | |
620 | favor = XDL_MERGE_FAVOR_OURS; | |
621 | break; | |
622 | case MERGE_RECURSIVE_THEIRS: | |
623 | favor = XDL_MERGE_FAVOR_THEIRS; | |
624 | break; | |
625 | default: | |
626 | favor = 0; | |
627 | break; | |
628 | } | |
629 | } | |
9047ebbc | 630 | |
4c5868f4 JN |
631 | if (strcmp(a->path, b->path) || |
632 | (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) { | |
633 | base_name = o->ancestor == NULL ? NULL : | |
634 | xstrdup(mkpath("%s:%s", o->ancestor, one->path)); | |
606475f3 MR |
635 | name1 = xstrdup(mkpath("%s:%s", branch1, a->path)); |
636 | name2 = xstrdup(mkpath("%s:%s", branch2, b->path)); | |
637 | } else { | |
4c5868f4 JN |
638 | base_name = o->ancestor == NULL ? NULL : |
639 | xstrdup(mkpath("%s", o->ancestor)); | |
606475f3 MR |
640 | name1 = xstrdup(mkpath("%s", branch1)); |
641 | name2 = xstrdup(mkpath("%s", branch2)); | |
642 | } | |
9047ebbc | 643 | |
06b65939 ML |
644 | read_mmblob(&orig, one->sha1); |
645 | read_mmblob(&src1, a->sha1); | |
646 | read_mmblob(&src2, b->sha1); | |
9047ebbc | 647 | |
4c5868f4 | 648 | merge_status = ll_merge(result_buf, a->path, &orig, base_name, |
9047ebbc | 649 | &src1, name1, &src2, name2, |
73cf7f71 | 650 | ((o->call_depth ? LL_OPT_VIRTUAL_ANCESTOR : 0) | |
18b037a5 | 651 | (o->renormalize ? LL_OPT_RENORMALIZE : 0) | |
73cf7f71 | 652 | create_ll_flag(favor))); |
9047ebbc MV |
653 | |
654 | free(name1); | |
655 | free(name2); | |
656 | free(orig.ptr); | |
657 | free(src1.ptr); | |
658 | free(src2.ptr); | |
659 | return merge_status; | |
660 | } | |
661 | ||
b7fa51da MV |
662 | static struct merge_file_info merge_file(struct merge_options *o, |
663 | struct diff_filespec *one, | |
664 | struct diff_filespec *a, | |
665 | struct diff_filespec *b, | |
666 | const char *branch1, | |
667 | const char *branch2) | |
9047ebbc MV |
668 | { |
669 | struct merge_file_info result; | |
670 | result.merge = 0; | |
671 | result.clean = 1; | |
672 | ||
673 | if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) { | |
674 | result.clean = 0; | |
675 | if (S_ISREG(a->mode)) { | |
676 | result.mode = a->mode; | |
677 | hashcpy(result.sha, a->sha1); | |
678 | } else { | |
679 | result.mode = b->mode; | |
680 | hashcpy(result.sha, b->sha1); | |
681 | } | |
682 | } else { | |
b7fa51da | 683 | if (!sha_eq(a->sha1, one->sha1) && !sha_eq(b->sha1, one->sha1)) |
9047ebbc MV |
684 | result.merge = 1; |
685 | ||
686 | /* | |
687 | * Merge modes | |
688 | */ | |
b7fa51da | 689 | if (a->mode == b->mode || a->mode == one->mode) |
9047ebbc MV |
690 | result.mode = b->mode; |
691 | else { | |
692 | result.mode = a->mode; | |
b7fa51da | 693 | if (b->mode != one->mode) { |
9047ebbc MV |
694 | result.clean = 0; |
695 | result.merge = 1; | |
696 | } | |
697 | } | |
698 | ||
b7fa51da | 699 | if (sha_eq(a->sha1, b->sha1) || sha_eq(a->sha1, one->sha1)) |
9047ebbc | 700 | hashcpy(result.sha, b->sha1); |
b7fa51da | 701 | else if (sha_eq(b->sha1, one->sha1)) |
9047ebbc MV |
702 | hashcpy(result.sha, a->sha1); |
703 | else if (S_ISREG(a->mode)) { | |
704 | mmbuffer_t result_buf; | |
705 | int merge_status; | |
706 | ||
b7fa51da | 707 | merge_status = merge_3way(o, &result_buf, one, a, b, |
9047ebbc MV |
708 | branch1, branch2); |
709 | ||
710 | if ((merge_status < 0) || !result_buf.ptr) | |
711 | die("Failed to execute internal merge"); | |
712 | ||
713 | if (write_sha1_file(result_buf.ptr, result_buf.size, | |
714 | blob_type, result.sha)) | |
715 | die("Unable to add %s to database", | |
716 | a->path); | |
717 | ||
718 | free(result_buf.ptr); | |
719 | result.clean = (merge_status == 0); | |
720 | } else if (S_ISGITLINK(a->mode)) { | |
721 | result.clean = 0; | |
722 | hashcpy(result.sha, a->sha1); | |
723 | } else if (S_ISLNK(a->mode)) { | |
724 | hashcpy(result.sha, a->sha1); | |
725 | ||
726 | if (!sha_eq(a->sha1, b->sha1)) | |
727 | result.clean = 0; | |
728 | } else { | |
729 | die("unsupported object type in the tree"); | |
730 | } | |
731 | } | |
732 | ||
733 | return result; | |
734 | } | |
735 | ||
8a2fce18 MV |
736 | static void conflict_rename_rename(struct merge_options *o, |
737 | struct rename *ren1, | |
9047ebbc MV |
738 | const char *branch1, |
739 | struct rename *ren2, | |
740 | const char *branch2) | |
741 | { | |
742 | char *del[2]; | |
743 | int delp = 0; | |
744 | const char *ren1_dst = ren1->pair->two->path; | |
745 | const char *ren2_dst = ren2->pair->two->path; | |
746 | const char *dst_name1 = ren1_dst; | |
747 | const char *dst_name2 = ren2_dst; | |
696ee23c MV |
748 | if (string_list_has_string(&o->current_directory_set, ren1_dst)) { |
749 | dst_name1 = del[delp++] = unique_path(o, ren1_dst, branch1); | |
8a2fce18 | 750 | output(o, 1, "%s is a directory in %s adding as %s instead", |
9047ebbc | 751 | ren1_dst, branch2, dst_name1); |
b7fa51da | 752 | remove_file(o, 0, ren1_dst, 0); |
9047ebbc | 753 | } |
696ee23c MV |
754 | if (string_list_has_string(&o->current_directory_set, ren2_dst)) { |
755 | dst_name2 = del[delp++] = unique_path(o, ren2_dst, branch2); | |
8a2fce18 | 756 | output(o, 1, "%s is a directory in %s adding as %s instead", |
9047ebbc | 757 | ren2_dst, branch1, dst_name2); |
b7fa51da | 758 | remove_file(o, 0, ren2_dst, 0); |
9047ebbc | 759 | } |
b7fa51da | 760 | if (o->call_depth) { |
9047ebbc MV |
761 | remove_file_from_cache(dst_name1); |
762 | remove_file_from_cache(dst_name2); | |
763 | /* | |
764 | * Uncomment to leave the conflicting names in the resulting tree | |
765 | * | |
b7fa51da MV |
766 | * update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, dst_name1); |
767 | * update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, dst_name2); | |
9047ebbc MV |
768 | */ |
769 | } else { | |
770 | update_stages(dst_name1, NULL, ren1->pair->two, NULL, 1); | |
771 | update_stages(dst_name2, NULL, NULL, ren2->pair->two, 1); | |
772 | } | |
773 | while (delp--) | |
774 | free(del[delp]); | |
775 | } | |
776 | ||
8a2fce18 MV |
777 | static void conflict_rename_dir(struct merge_options *o, |
778 | struct rename *ren1, | |
9047ebbc MV |
779 | const char *branch1) |
780 | { | |
696ee23c | 781 | char *new_path = unique_path(o, ren1->pair->two->path, branch1); |
8a2fce18 | 782 | output(o, 1, "Renaming %s to %s instead", ren1->pair->one->path, new_path); |
b7fa51da MV |
783 | remove_file(o, 0, ren1->pair->two->path, 0); |
784 | update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path); | |
9047ebbc MV |
785 | free(new_path); |
786 | } | |
787 | ||
8a2fce18 MV |
788 | static void conflict_rename_rename_2(struct merge_options *o, |
789 | struct rename *ren1, | |
9047ebbc MV |
790 | const char *branch1, |
791 | struct rename *ren2, | |
792 | const char *branch2) | |
793 | { | |
696ee23c MV |
794 | char *new_path1 = unique_path(o, ren1->pair->two->path, branch1); |
795 | char *new_path2 = unique_path(o, ren2->pair->two->path, branch2); | |
8a2fce18 | 796 | output(o, 1, "Renaming %s to %s and %s to %s instead", |
9047ebbc MV |
797 | ren1->pair->one->path, new_path1, |
798 | ren2->pair->one->path, new_path2); | |
b7fa51da MV |
799 | remove_file(o, 0, ren1->pair->two->path, 0); |
800 | update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path1); | |
801 | update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, new_path2); | |
9047ebbc MV |
802 | free(new_path2); |
803 | free(new_path1); | |
804 | } | |
805 | ||
8a2fce18 MV |
806 | static int process_renames(struct merge_options *o, |
807 | struct string_list *a_renames, | |
808 | struct string_list *b_renames) | |
9047ebbc MV |
809 | { |
810 | int clean_merge = 1, i, j; | |
811 | struct string_list a_by_dst = {NULL, 0, 0, 0}, b_by_dst = {NULL, 0, 0, 0}; | |
812 | const struct rename *sre; | |
813 | ||
814 | for (i = 0; i < a_renames->nr; i++) { | |
815 | sre = a_renames->items[i].util; | |
816 | string_list_insert(sre->pair->two->path, &a_by_dst)->util | |
817 | = sre->dst_entry; | |
818 | } | |
819 | for (i = 0; i < b_renames->nr; i++) { | |
820 | sre = b_renames->items[i].util; | |
821 | string_list_insert(sre->pair->two->path, &b_by_dst)->util | |
822 | = sre->dst_entry; | |
823 | } | |
824 | ||
825 | for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) { | |
9047ebbc | 826 | char *src; |
8e24cbae | 827 | struct string_list *renames1, *renames2Dst; |
9047ebbc MV |
828 | struct rename *ren1 = NULL, *ren2 = NULL; |
829 | const char *branch1, *branch2; | |
830 | const char *ren1_src, *ren1_dst; | |
831 | ||
832 | if (i >= a_renames->nr) { | |
9047ebbc MV |
833 | ren2 = b_renames->items[j++].util; |
834 | } else if (j >= b_renames->nr) { | |
9047ebbc MV |
835 | ren1 = a_renames->items[i++].util; |
836 | } else { | |
8e24cbae BK |
837 | int compare = strcmp(a_renames->items[i].string, |
838 | b_renames->items[j].string); | |
9047ebbc MV |
839 | if (compare <= 0) |
840 | ren1 = a_renames->items[i++].util; | |
841 | if (compare >= 0) | |
842 | ren2 = b_renames->items[j++].util; | |
843 | } | |
844 | ||
845 | /* TODO: refactor, so that 1/2 are not needed */ | |
846 | if (ren1) { | |
847 | renames1 = a_renames; | |
9047ebbc | 848 | renames2Dst = &b_by_dst; |
8a2fce18 MV |
849 | branch1 = o->branch1; |
850 | branch2 = o->branch2; | |
9047ebbc MV |
851 | } else { |
852 | struct rename *tmp; | |
853 | renames1 = b_renames; | |
9047ebbc | 854 | renames2Dst = &a_by_dst; |
8a2fce18 MV |
855 | branch1 = o->branch2; |
856 | branch2 = o->branch1; | |
9047ebbc MV |
857 | tmp = ren2; |
858 | ren2 = ren1; | |
859 | ren1 = tmp; | |
860 | } | |
861 | src = ren1->pair->one->path; | |
862 | ||
863 | ren1->dst_entry->processed = 1; | |
864 | ren1->src_entry->processed = 1; | |
865 | ||
866 | if (ren1->processed) | |
867 | continue; | |
868 | ren1->processed = 1; | |
869 | ||
870 | ren1_src = ren1->pair->one->path; | |
871 | ren1_dst = ren1->pair->two->path; | |
872 | ||
873 | if (ren2) { | |
874 | const char *ren2_src = ren2->pair->one->path; | |
875 | const char *ren2_dst = ren2->pair->two->path; | |
876 | /* Renamed in 1 and renamed in 2 */ | |
877 | if (strcmp(ren1_src, ren2_src) != 0) | |
878 | die("ren1.src != ren2.src"); | |
879 | ren2->dst_entry->processed = 1; | |
880 | ren2->processed = 1; | |
881 | if (strcmp(ren1_dst, ren2_dst) != 0) { | |
882 | clean_merge = 0; | |
8a2fce18 | 883 | output(o, 1, "CONFLICT (rename/rename): " |
9047ebbc MV |
884 | "Rename \"%s\"->\"%s\" in branch \"%s\" " |
885 | "rename \"%s\"->\"%s\" in \"%s\"%s", | |
886 | src, ren1_dst, branch1, | |
887 | src, ren2_dst, branch2, | |
b7fa51da MV |
888 | o->call_depth ? " (left unresolved)": ""); |
889 | if (o->call_depth) { | |
9047ebbc | 890 | remove_file_from_cache(src); |
b7fa51da | 891 | update_file(o, 0, ren1->pair->one->sha1, |
9047ebbc MV |
892 | ren1->pair->one->mode, src); |
893 | } | |
8a2fce18 | 894 | conflict_rename_rename(o, ren1, branch1, ren2, branch2); |
9047ebbc MV |
895 | } else { |
896 | struct merge_file_info mfi; | |
b7fa51da MV |
897 | remove_file(o, 1, ren1_src, 1); |
898 | mfi = merge_file(o, | |
899 | ren1->pair->one, | |
9047ebbc MV |
900 | ren1->pair->two, |
901 | ren2->pair->two, | |
902 | branch1, | |
903 | branch2); | |
904 | if (mfi.merge || !mfi.clean) | |
8a2fce18 | 905 | output(o, 1, "Renaming %s->%s", src, ren1_dst); |
9047ebbc MV |
906 | |
907 | if (mfi.merge) | |
8a2fce18 | 908 | output(o, 2, "Auto-merging %s", ren1_dst); |
9047ebbc MV |
909 | |
910 | if (!mfi.clean) { | |
8a2fce18 | 911 | output(o, 1, "CONFLICT (content): merge conflict in %s", |
9047ebbc MV |
912 | ren1_dst); |
913 | clean_merge = 0; | |
914 | ||
b7fa51da | 915 | if (!o->call_depth) |
9047ebbc MV |
916 | update_stages(ren1_dst, |
917 | ren1->pair->one, | |
918 | ren1->pair->two, | |
919 | ren2->pair->two, | |
920 | 1 /* clear */); | |
921 | } | |
b7fa51da | 922 | update_file(o, mfi.clean, mfi.sha, mfi.mode, ren1_dst); |
9047ebbc MV |
923 | } |
924 | } else { | |
925 | /* Renamed in 1, maybe changed in 2 */ | |
926 | struct string_list_item *item; | |
927 | /* we only use sha1 and mode of these */ | |
928 | struct diff_filespec src_other, dst_other; | |
929 | int try_merge, stage = a_renames == renames1 ? 3: 2; | |
930 | ||
b7fa51da | 931 | remove_file(o, 1, ren1_src, o->call_depth || stage == 3); |
9047ebbc MV |
932 | |
933 | hashcpy(src_other.sha1, ren1->src_entry->stages[stage].sha); | |
934 | src_other.mode = ren1->src_entry->stages[stage].mode; | |
935 | hashcpy(dst_other.sha1, ren1->dst_entry->stages[stage].sha); | |
936 | dst_other.mode = ren1->dst_entry->stages[stage].mode; | |
937 | ||
938 | try_merge = 0; | |
939 | ||
696ee23c | 940 | if (string_list_has_string(&o->current_directory_set, ren1_dst)) { |
9047ebbc | 941 | clean_merge = 0; |
8a2fce18 | 942 | output(o, 1, "CONFLICT (rename/directory): Rename %s->%s in %s " |
9047ebbc MV |
943 | " directory %s added in %s", |
944 | ren1_src, ren1_dst, branch1, | |
945 | ren1_dst, branch2); | |
8a2fce18 | 946 | conflict_rename_dir(o, ren1, branch1); |
9047ebbc MV |
947 | } else if (sha_eq(src_other.sha1, null_sha1)) { |
948 | clean_merge = 0; | |
8a2fce18 | 949 | output(o, 1, "CONFLICT (rename/delete): Rename %s->%s in %s " |
9047ebbc MV |
950 | "and deleted in %s", |
951 | ren1_src, ren1_dst, branch1, | |
952 | branch2); | |
b7fa51da | 953 | update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst); |
bf74106a DO |
954 | if (!o->call_depth) |
955 | update_stages(ren1_dst, NULL, | |
956 | branch1 == o->branch1 ? | |
957 | ren1->pair->two : NULL, | |
958 | branch1 == o->branch1 ? | |
959 | NULL : ren1->pair->two, 1); | |
9047ebbc MV |
960 | } else if (!sha_eq(dst_other.sha1, null_sha1)) { |
961 | const char *new_path; | |
962 | clean_merge = 0; | |
963 | try_merge = 1; | |
8a2fce18 | 964 | output(o, 1, "CONFLICT (rename/add): Rename %s->%s in %s. " |
9047ebbc MV |
965 | "%s added in %s", |
966 | ren1_src, ren1_dst, branch1, | |
967 | ren1_dst, branch2); | |
c94736a2 JH |
968 | if (o->call_depth) { |
969 | struct merge_file_info mfi; | |
970 | struct diff_filespec one, a, b; | |
971 | ||
972 | one.path = a.path = b.path = | |
973 | (char *)ren1_dst; | |
974 | hashcpy(one.sha1, null_sha1); | |
975 | one.mode = 0; | |
976 | hashcpy(a.sha1, ren1->pair->two->sha1); | |
977 | a.mode = ren1->pair->two->mode; | |
978 | hashcpy(b.sha1, dst_other.sha1); | |
979 | b.mode = dst_other.mode; | |
980 | mfi = merge_file(o, &one, &a, &b, | |
981 | branch1, | |
982 | branch2); | |
983 | output(o, 1, "Adding merged %s", ren1_dst); | |
984 | update_file(o, 0, | |
985 | mfi.sha, | |
986 | mfi.mode, | |
987 | ren1_dst); | |
988 | } else { | |
989 | new_path = unique_path(o, ren1_dst, branch2); | |
990 | output(o, 1, "Adding as %s instead", new_path); | |
991 | update_file(o, 0, dst_other.sha1, dst_other.mode, new_path); | |
992 | } | |
9047ebbc MV |
993 | } else if ((item = string_list_lookup(ren1_dst, renames2Dst))) { |
994 | ren2 = item->util; | |
995 | clean_merge = 0; | |
996 | ren2->processed = 1; | |
8a2fce18 MV |
997 | output(o, 1, "CONFLICT (rename/rename): " |
998 | "Rename %s->%s in %s. " | |
9047ebbc MV |
999 | "Rename %s->%s in %s", |
1000 | ren1_src, ren1_dst, branch1, | |
1001 | ren2->pair->one->path, ren2->pair->two->path, branch2); | |
8a2fce18 | 1002 | conflict_rename_rename_2(o, ren1, branch1, ren2, branch2); |
9047ebbc MV |
1003 | } else |
1004 | try_merge = 1; | |
1005 | ||
1006 | if (try_merge) { | |
8a2fce18 | 1007 | struct diff_filespec *one, *a, *b; |
9047ebbc MV |
1008 | struct merge_file_info mfi; |
1009 | src_other.path = (char *)ren1_src; | |
1010 | ||
8a2fce18 | 1011 | one = ren1->pair->one; |
9047ebbc MV |
1012 | if (a_renames == renames1) { |
1013 | a = ren1->pair->two; | |
1014 | b = &src_other; | |
1015 | } else { | |
1016 | b = ren1->pair->two; | |
1017 | a = &src_other; | |
1018 | } | |
b7fa51da | 1019 | mfi = merge_file(o, one, a, b, |
8a2fce18 | 1020 | o->branch1, o->branch2); |
9047ebbc MV |
1021 | |
1022 | if (mfi.clean && | |
1023 | sha_eq(mfi.sha, ren1->pair->two->sha1) && | |
1024 | mfi.mode == ren1->pair->two->mode) | |
1025 | /* | |
1026 | * This messaged is part of | |
1027 | * t6022 test. If you change | |
1028 | * it update the test too. | |
1029 | */ | |
8a2fce18 | 1030 | output(o, 3, "Skipped %s (merged same as existing)", ren1_dst); |
9047ebbc MV |
1031 | else { |
1032 | if (mfi.merge || !mfi.clean) | |
8a2fce18 | 1033 | output(o, 1, "Renaming %s => %s", ren1_src, ren1_dst); |
9047ebbc | 1034 | if (mfi.merge) |
8a2fce18 | 1035 | output(o, 2, "Auto-merging %s", ren1_dst); |
9047ebbc | 1036 | if (!mfi.clean) { |
8a2fce18 | 1037 | output(o, 1, "CONFLICT (rename/modify): Merge conflict in %s", |
9047ebbc MV |
1038 | ren1_dst); |
1039 | clean_merge = 0; | |
1040 | ||
b7fa51da | 1041 | if (!o->call_depth) |
9047ebbc | 1042 | update_stages(ren1_dst, |
8a2fce18 | 1043 | one, a, b, 1); |
9047ebbc | 1044 | } |
b7fa51da | 1045 | update_file(o, mfi.clean, mfi.sha, mfi.mode, ren1_dst); |
9047ebbc MV |
1046 | } |
1047 | } | |
1048 | } | |
1049 | } | |
1050 | string_list_clear(&a_by_dst, 0); | |
1051 | string_list_clear(&b_by_dst, 0); | |
1052 | ||
1053 | return clean_merge; | |
1054 | } | |
1055 | ||
1056 | static unsigned char *stage_sha(const unsigned char *sha, unsigned mode) | |
1057 | { | |
1058 | return (is_null_sha1(sha) || mode == 0) ? NULL: (unsigned char *)sha; | |
1059 | } | |
1060 | ||
331a1838 EB |
1061 | static int read_sha1_strbuf(const unsigned char *sha1, struct strbuf *dst) |
1062 | { | |
1063 | void *buf; | |
1064 | enum object_type type; | |
1065 | unsigned long size; | |
1066 | buf = read_sha1_file(sha1, &type, &size); | |
1067 | if (!buf) | |
1068 | return error("cannot read object %s", sha1_to_hex(sha1)); | |
1069 | if (type != OBJ_BLOB) { | |
1070 | free(buf); | |
1071 | return error("object %s is not a blob", sha1_to_hex(sha1)); | |
1072 | } | |
1073 | strbuf_attach(dst, buf, size, size + 1); | |
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | static int blob_unchanged(const unsigned char *o_sha, | |
1078 | const unsigned char *a_sha, | |
3e7589b7 | 1079 | int renormalize, const char *path) |
331a1838 EB |
1080 | { |
1081 | struct strbuf o = STRBUF_INIT; | |
1082 | struct strbuf a = STRBUF_INIT; | |
1083 | int ret = 0; /* assume changed for safety */ | |
1084 | ||
1085 | if (sha_eq(o_sha, a_sha)) | |
1086 | return 1; | |
3e7589b7 | 1087 | if (!renormalize) |
331a1838 EB |
1088 | return 0; |
1089 | ||
1090 | assert(o_sha && a_sha); | |
1091 | if (read_sha1_strbuf(o_sha, &o) || read_sha1_strbuf(a_sha, &a)) | |
1092 | goto error_return; | |
1093 | /* | |
1094 | * Note: binary | is used so that both renormalizations are | |
1095 | * performed. Comparison can be skipped if both files are | |
1096 | * unchanged since their sha1s have already been compared. | |
1097 | */ | |
1098 | if (renormalize_buffer(path, o.buf, o.len, &o) | | |
1099 | renormalize_buffer(path, a.buf, o.len, &a)) | |
1100 | ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len)); | |
1101 | ||
1102 | error_return: | |
1103 | strbuf_release(&o); | |
1104 | strbuf_release(&a); | |
1105 | return ret; | |
1106 | } | |
1107 | ||
9047ebbc | 1108 | /* Per entry merge function */ |
8a2fce18 MV |
1109 | static int process_entry(struct merge_options *o, |
1110 | const char *path, struct stage_data *entry) | |
9047ebbc MV |
1111 | { |
1112 | /* | |
1113 | printf("processing entry, clean cache: %s\n", index_only ? "yes": "no"); | |
1114 | print_index_entry("\tpath: ", entry); | |
1115 | */ | |
1116 | int clean_merge = 1; | |
1bc0ab7c | 1117 | int normalize = o->renormalize; |
9047ebbc MV |
1118 | unsigned o_mode = entry->stages[1].mode; |
1119 | unsigned a_mode = entry->stages[2].mode; | |
1120 | unsigned b_mode = entry->stages[3].mode; | |
1121 | unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode); | |
1122 | unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode); | |
1123 | unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode); | |
1124 | ||
1125 | if (o_sha && (!a_sha || !b_sha)) { | |
1126 | /* Case A: Deleted in one */ | |
1127 | if ((!a_sha && !b_sha) || | |
3e7589b7 JN |
1128 | (!b_sha && blob_unchanged(o_sha, a_sha, normalize, path)) || |
1129 | (!a_sha && blob_unchanged(o_sha, b_sha, normalize, path))) { | |
9047ebbc MV |
1130 | /* Deleted in both or deleted in one and |
1131 | * unchanged in the other */ | |
1132 | if (a_sha) | |
8a2fce18 | 1133 | output(o, 2, "Removing %s", path); |
9047ebbc | 1134 | /* do not touch working file if it did not exist */ |
b7fa51da | 1135 | remove_file(o, 1, path, !a_sha); |
9047ebbc MV |
1136 | } else { |
1137 | /* Deleted in one and changed in the other */ | |
1138 | clean_merge = 0; | |
1139 | if (!a_sha) { | |
8a2fce18 | 1140 | output(o, 1, "CONFLICT (delete/modify): %s deleted in %s " |
9047ebbc | 1141 | "and modified in %s. Version %s of %s left in tree.", |
8a2fce18 MV |
1142 | path, o->branch1, |
1143 | o->branch2, o->branch2, path); | |
b7fa51da | 1144 | update_file(o, 0, b_sha, b_mode, path); |
9047ebbc | 1145 | } else { |
8a2fce18 | 1146 | output(o, 1, "CONFLICT (delete/modify): %s deleted in %s " |
9047ebbc | 1147 | "and modified in %s. Version %s of %s left in tree.", |
8a2fce18 MV |
1148 | path, o->branch2, |
1149 | o->branch1, o->branch1, path); | |
b7fa51da | 1150 | update_file(o, 0, a_sha, a_mode, path); |
9047ebbc MV |
1151 | } |
1152 | } | |
1153 | ||
1154 | } else if ((!o_sha && a_sha && !b_sha) || | |
1155 | (!o_sha && !a_sha && b_sha)) { | |
1156 | /* Case B: Added in one. */ | |
1157 | const char *add_branch; | |
1158 | const char *other_branch; | |
1159 | unsigned mode; | |
1160 | const unsigned char *sha; | |
1161 | const char *conf; | |
1162 | ||
1163 | if (a_sha) { | |
8a2fce18 MV |
1164 | add_branch = o->branch1; |
1165 | other_branch = o->branch2; | |
9047ebbc MV |
1166 | mode = a_mode; |
1167 | sha = a_sha; | |
1168 | conf = "file/directory"; | |
1169 | } else { | |
8a2fce18 MV |
1170 | add_branch = o->branch2; |
1171 | other_branch = o->branch1; | |
9047ebbc MV |
1172 | mode = b_mode; |
1173 | sha = b_sha; | |
1174 | conf = "directory/file"; | |
1175 | } | |
696ee23c MV |
1176 | if (string_list_has_string(&o->current_directory_set, path)) { |
1177 | const char *new_path = unique_path(o, path, add_branch); | |
9047ebbc | 1178 | clean_merge = 0; |
8a2fce18 | 1179 | output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. " |
9047ebbc MV |
1180 | "Adding %s as %s", |
1181 | conf, path, other_branch, path, new_path); | |
b7fa51da MV |
1182 | remove_file(o, 0, path, 0); |
1183 | update_file(o, 0, sha, mode, new_path); | |
9047ebbc | 1184 | } else { |
8a2fce18 | 1185 | output(o, 2, "Adding %s", path); |
b7fa51da | 1186 | update_file(o, 1, sha, mode, path); |
9047ebbc MV |
1187 | } |
1188 | } else if (a_sha && b_sha) { | |
1189 | /* Case C: Added in both (check for same permissions) and */ | |
1190 | /* case D: Modified in both, but differently. */ | |
1191 | const char *reason = "content"; | |
1192 | struct merge_file_info mfi; | |
8a2fce18 | 1193 | struct diff_filespec one, a, b; |
9047ebbc MV |
1194 | |
1195 | if (!o_sha) { | |
1196 | reason = "add/add"; | |
1197 | o_sha = (unsigned char *)null_sha1; | |
1198 | } | |
8a2fce18 MV |
1199 | output(o, 2, "Auto-merging %s", path); |
1200 | one.path = a.path = b.path = (char *)path; | |
1201 | hashcpy(one.sha1, o_sha); | |
1202 | one.mode = o_mode; | |
9047ebbc MV |
1203 | hashcpy(a.sha1, a_sha); |
1204 | a.mode = a_mode; | |
1205 | hashcpy(b.sha1, b_sha); | |
1206 | b.mode = b_mode; | |
1207 | ||
b7fa51da | 1208 | mfi = merge_file(o, &one, &a, &b, |
8a2fce18 | 1209 | o->branch1, o->branch2); |
9047ebbc MV |
1210 | |
1211 | clean_merge = mfi.clean; | |
39d8e271 CB |
1212 | if (!mfi.clean) { |
1213 | if (S_ISGITLINK(mfi.mode)) | |
1214 | reason = "submodule"; | |
8a2fce18 | 1215 | output(o, 1, "CONFLICT (%s): Merge conflict in %s", |
9047ebbc | 1216 | reason, path); |
9047ebbc | 1217 | } |
39d8e271 | 1218 | update_file(o, mfi.clean, mfi.sha, mfi.mode, path); |
9047ebbc MV |
1219 | } else if (!o_sha && !a_sha && !b_sha) { |
1220 | /* | |
1221 | * this entry was deleted altogether. a_mode == 0 means | |
1222 | * we had that path and want to actively remove it. | |
1223 | */ | |
b7fa51da | 1224 | remove_file(o, 1, path, !a_mode); |
9047ebbc MV |
1225 | } else |
1226 | die("Fatal merge failure, shouldn't happen."); | |
1227 | ||
1228 | return clean_merge; | |
1229 | } | |
1230 | ||
264b774b MM |
1231 | struct unpack_trees_error_msgs get_porcelain_error_msgs(void) |
1232 | { | |
1233 | struct unpack_trees_error_msgs msgs = { | |
1234 | /* would_overwrite */ | |
1235 | "Your local changes to '%s' would be overwritten by merge. Aborting.", | |
1236 | /* not_uptodate_file */ | |
1237 | "Your local changes to '%s' would be overwritten by merge. Aborting.", | |
1238 | /* not_uptodate_dir */ | |
1239 | "Updating '%s' would lose untracked files in it. Aborting.", | |
1240 | /* would_lose_untracked */ | |
1241 | "Untracked working tree file '%s' would be %s by merge. Aborting", | |
1242 | /* bind_overlap -- will not happen here */ | |
1243 | NULL, | |
1244 | }; | |
045c0504 JH |
1245 | if (advice_commit_before_merge) { |
1246 | msgs.would_overwrite = msgs.not_uptodate_file = | |
1247 | "Your local changes to '%s' would be overwritten by merge. Aborting.\n" | |
1248 | "Please, commit your changes or stash them before you can merge."; | |
1249 | } | |
264b774b MM |
1250 | return msgs; |
1251 | } | |
1252 | ||
8a2fce18 MV |
1253 | int merge_trees(struct merge_options *o, |
1254 | struct tree *head, | |
9047ebbc MV |
1255 | struct tree *merge, |
1256 | struct tree *common, | |
9047ebbc MV |
1257 | struct tree **result) |
1258 | { | |
1259 | int code, clean; | |
1260 | ||
85e51b78 JH |
1261 | if (o->subtree_shift) { |
1262 | merge = shift_tree_object(head, merge, o->subtree_shift); | |
1263 | common = shift_tree_object(head, common, o->subtree_shift); | |
9047ebbc MV |
1264 | } |
1265 | ||
1266 | if (sha_eq(common->object.sha1, merge->object.sha1)) { | |
8a2fce18 | 1267 | output(o, 0, "Already uptodate!"); |
9047ebbc MV |
1268 | *result = head; |
1269 | return 1; | |
1270 | } | |
1271 | ||
b7fa51da | 1272 | code = git_merge_trees(o->call_depth, common, head, merge); |
9047ebbc | 1273 | |
fadd069d JH |
1274 | if (code != 0) { |
1275 | if (show(o, 4) || o->call_depth) | |
1276 | die("merging of trees %s and %s failed", | |
1277 | sha1_to_hex(head->object.sha1), | |
1278 | sha1_to_hex(merge->object.sha1)); | |
1279 | else | |
1280 | exit(128); | |
1281 | } | |
9047ebbc MV |
1282 | |
1283 | if (unmerged_cache()) { | |
1284 | struct string_list *entries, *re_head, *re_merge; | |
1285 | int i; | |
696ee23c MV |
1286 | string_list_clear(&o->current_file_set, 1); |
1287 | string_list_clear(&o->current_directory_set, 1); | |
1288 | get_files_dirs(o, head); | |
1289 | get_files_dirs(o, merge); | |
9047ebbc MV |
1290 | |
1291 | entries = get_unmerged(); | |
8a2fce18 MV |
1292 | re_head = get_renames(o, head, common, head, merge, entries); |
1293 | re_merge = get_renames(o, merge, common, head, merge, entries); | |
1294 | clean = process_renames(o, re_head, re_merge); | |
9047ebbc MV |
1295 | for (i = 0; i < entries->nr; i++) { |
1296 | const char *path = entries->items[i].string; | |
1297 | struct stage_data *e = entries->items[i].util; | |
1298 | if (!e->processed | |
8a2fce18 | 1299 | && !process_entry(o, path, e)) |
9047ebbc MV |
1300 | clean = 0; |
1301 | } | |
1302 | ||
1303 | string_list_clear(re_merge, 0); | |
1304 | string_list_clear(re_head, 0); | |
1305 | string_list_clear(entries, 1); | |
1306 | ||
1307 | } | |
1308 | else | |
1309 | clean = 1; | |
1310 | ||
b7fa51da | 1311 | if (o->call_depth) |
8a2fce18 | 1312 | *result = write_tree_from_memory(o); |
9047ebbc MV |
1313 | |
1314 | return clean; | |
1315 | } | |
1316 | ||
1317 | static struct commit_list *reverse_commit_list(struct commit_list *list) | |
1318 | { | |
1319 | struct commit_list *next = NULL, *current, *backup; | |
1320 | for (current = list; current; current = backup) { | |
1321 | backup = current->next; | |
1322 | current->next = next; | |
1323 | next = current; | |
1324 | } | |
1325 | return next; | |
1326 | } | |
1327 | ||
1328 | /* | |
1329 | * Merge the commits h1 and h2, return the resulting virtual | |
1330 | * commit object and a flag indicating the cleanness of the merge. | |
1331 | */ | |
8a2fce18 MV |
1332 | int merge_recursive(struct merge_options *o, |
1333 | struct commit *h1, | |
9047ebbc | 1334 | struct commit *h2, |
9047ebbc MV |
1335 | struct commit_list *ca, |
1336 | struct commit **result) | |
1337 | { | |
1338 | struct commit_list *iter; | |
1339 | struct commit *merged_common_ancestors; | |
1340 | struct tree *mrtree = mrtree; | |
1341 | int clean; | |
1342 | ||
8a2fce18 MV |
1343 | if (show(o, 4)) { |
1344 | output(o, 4, "Merging:"); | |
5033639c MV |
1345 | output_commit_title(o, h1); |
1346 | output_commit_title(o, h2); | |
9047ebbc MV |
1347 | } |
1348 | ||
1349 | if (!ca) { | |
1350 | ca = get_merge_bases(h1, h2, 1); | |
1351 | ca = reverse_commit_list(ca); | |
1352 | } | |
1353 | ||
8a2fce18 MV |
1354 | if (show(o, 5)) { |
1355 | output(o, 5, "found %u common ancestor(s):", commit_list_count(ca)); | |
9047ebbc | 1356 | for (iter = ca; iter; iter = iter->next) |
5033639c | 1357 | output_commit_title(o, iter->item); |
9047ebbc MV |
1358 | } |
1359 | ||
1360 | merged_common_ancestors = pop_commit(&ca); | |
1361 | if (merged_common_ancestors == NULL) { | |
1362 | /* if there is no common ancestor, make an empty tree */ | |
1363 | struct tree *tree = xcalloc(1, sizeof(struct tree)); | |
1364 | ||
1365 | tree->object.parsed = 1; | |
1366 | tree->object.type = OBJ_TREE; | |
1367 | pretend_sha1_file(NULL, 0, OBJ_TREE, tree->object.sha1); | |
1368 | merged_common_ancestors = make_virtual_commit(tree, "ancestor"); | |
1369 | } | |
1370 | ||
1371 | for (iter = ca; iter; iter = iter->next) { | |
8a2fce18 | 1372 | const char *saved_b1, *saved_b2; |
5033639c | 1373 | o->call_depth++; |
9047ebbc MV |
1374 | /* |
1375 | * When the merge fails, the result contains files | |
1376 | * with conflict markers. The cleanness flag is | |
1377 | * ignored, it was never actually used, as result of | |
1378 | * merge_trees has always overwritten it: the committed | |
1379 | * "conflicts" were already resolved. | |
1380 | */ | |
1381 | discard_cache(); | |
8a2fce18 MV |
1382 | saved_b1 = o->branch1; |
1383 | saved_b2 = o->branch2; | |
1384 | o->branch1 = "Temporary merge branch 1"; | |
1385 | o->branch2 = "Temporary merge branch 2"; | |
1386 | merge_recursive(o, merged_common_ancestors, iter->item, | |
1387 | NULL, &merged_common_ancestors); | |
1388 | o->branch1 = saved_b1; | |
1389 | o->branch2 = saved_b2; | |
5033639c | 1390 | o->call_depth--; |
9047ebbc MV |
1391 | |
1392 | if (!merged_common_ancestors) | |
1393 | die("merge returned no commit"); | |
1394 | } | |
1395 | ||
1396 | discard_cache(); | |
b7fa51da | 1397 | if (!o->call_depth) |
9047ebbc | 1398 | read_cache(); |
9047ebbc | 1399 | |
7ca56aa0 | 1400 | o->ancestor = "merged common ancestors"; |
8a2fce18 MV |
1401 | clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree, |
1402 | &mrtree); | |
9047ebbc | 1403 | |
b7fa51da | 1404 | if (o->call_depth) { |
9047ebbc MV |
1405 | *result = make_virtual_commit(mrtree, "merged tree"); |
1406 | commit_list_insert(h1, &(*result)->parents); | |
1407 | commit_list_insert(h2, &(*result)->parents->next); | |
1408 | } | |
c7d84924 | 1409 | flush_output(o); |
9047ebbc MV |
1410 | return clean; |
1411 | } | |
1412 | ||
73118f89 SB |
1413 | static struct commit *get_ref(const unsigned char *sha1, const char *name) |
1414 | { | |
1415 | struct object *object; | |
1416 | ||
1417 | object = deref_tag(parse_object(sha1), name, strlen(name)); | |
1418 | if (!object) | |
1419 | return NULL; | |
1420 | if (object->type == OBJ_TREE) | |
1421 | return make_virtual_commit((struct tree*)object, name); | |
1422 | if (object->type != OBJ_COMMIT) | |
1423 | return NULL; | |
1424 | if (parse_commit((struct commit *)object)) | |
1425 | return NULL; | |
1426 | return (struct commit *)object; | |
1427 | } | |
1428 | ||
8a2fce18 MV |
1429 | int merge_recursive_generic(struct merge_options *o, |
1430 | const unsigned char *head, | |
1431 | const unsigned char *merge, | |
1432 | int num_base_list, | |
1433 | const unsigned char **base_list, | |
1434 | struct commit **result) | |
73118f89 SB |
1435 | { |
1436 | int clean, index_fd; | |
1437 | struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); | |
8a2fce18 MV |
1438 | struct commit *head_commit = get_ref(head, o->branch1); |
1439 | struct commit *next_commit = get_ref(merge, o->branch2); | |
73118f89 SB |
1440 | struct commit_list *ca = NULL; |
1441 | ||
1442 | if (base_list) { | |
1443 | int i; | |
8a2fce18 | 1444 | for (i = 0; i < num_base_list; ++i) { |
73118f89 | 1445 | struct commit *base; |
8a2fce18 | 1446 | if (!(base = get_ref(base_list[i], sha1_to_hex(base_list[i])))) |
73118f89 | 1447 | return error("Could not parse object '%s'", |
8a2fce18 | 1448 | sha1_to_hex(base_list[i])); |
73118f89 SB |
1449 | commit_list_insert(base, &ca); |
1450 | } | |
1451 | } | |
1452 | ||
1453 | index_fd = hold_locked_index(lock, 1); | |
8a2fce18 MV |
1454 | clean = merge_recursive(o, head_commit, next_commit, ca, |
1455 | result); | |
73118f89 SB |
1456 | if (active_cache_changed && |
1457 | (write_cache(index_fd, active_cache, active_nr) || | |
1458 | commit_locked_index(lock))) | |
1459 | return error("Unable to write index."); | |
1460 | ||
1461 | return clean ? 0 : 1; | |
1462 | } | |
1463 | ||
8a2fce18 | 1464 | static int merge_recursive_config(const char *var, const char *value, void *cb) |
9047ebbc | 1465 | { |
8a2fce18 | 1466 | struct merge_options *o = cb; |
9047ebbc | 1467 | if (!strcasecmp(var, "merge.verbosity")) { |
8a2fce18 | 1468 | o->verbosity = git_config_int(var, value); |
9047ebbc MV |
1469 | return 0; |
1470 | } | |
1471 | if (!strcasecmp(var, "diff.renamelimit")) { | |
8a2fce18 | 1472 | o->diff_rename_limit = git_config_int(var, value); |
9047ebbc MV |
1473 | return 0; |
1474 | } | |
1475 | if (!strcasecmp(var, "merge.renamelimit")) { | |
8a2fce18 | 1476 | o->merge_rename_limit = git_config_int(var, value); |
9047ebbc MV |
1477 | return 0; |
1478 | } | |
e137a892 | 1479 | return git_xmerge_config(var, value, cb); |
9047ebbc MV |
1480 | } |
1481 | ||
8a2fce18 | 1482 | void init_merge_options(struct merge_options *o) |
9047ebbc | 1483 | { |
8a2fce18 MV |
1484 | memset(o, 0, sizeof(struct merge_options)); |
1485 | o->verbosity = 2; | |
1486 | o->buffer_output = 1; | |
1487 | o->diff_rename_limit = -1; | |
1488 | o->merge_rename_limit = -1; | |
1bc0ab7c | 1489 | o->renormalize = merge_renormalize; |
8a2fce18 | 1490 | git_config(merge_recursive_config, o); |
9047ebbc | 1491 | if (getenv("GIT_MERGE_VERBOSITY")) |
8a2fce18 | 1492 | o->verbosity = |
9047ebbc | 1493 | strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10); |
8a2fce18 MV |
1494 | if (o->verbosity >= 5) |
1495 | o->buffer_output = 0; | |
c7d84924 | 1496 | strbuf_init(&o->obuf, 0); |
696ee23c MV |
1497 | memset(&o->current_file_set, 0, sizeof(struct string_list)); |
1498 | o->current_file_set.strdup_strings = 1; | |
1499 | memset(&o->current_directory_set, 0, sizeof(struct string_list)); | |
1500 | o->current_directory_set.strdup_strings = 1; | |
9047ebbc | 1501 | } |