Convert struct object to object_id
[git/git.git] / notes-merge.c
CommitLineData
75ef3f4a
JH
1#include "cache.h"
2#include "commit.h"
3#include "refs.h"
2085b16a
JH
4#include "diff.h"
5#include "diffcore.h"
809f38c8
JH
6#include "xdiff-interface.h"
7#include "ll-merge.h"
8#include "dir.h"
56881843 9#include "notes.h"
75ef3f4a 10#include "notes-merge.h"
443259cf 11#include "strbuf.h"
bf9a05ba 12#include "notes-utils.h"
75ef3f4a 13
2085b16a
JH
14struct notes_merge_pair {
15 unsigned char obj[20], base[20], local[20], remote[20];
16};
17
75ef3f4a
JH
18void init_notes_merge_options(struct notes_merge_options *o)
19{
20 memset(o, 0, sizeof(struct notes_merge_options));
443259cf 21 strbuf_init(&(o->commit_msg), 0);
75ef3f4a
JH
22 o->verbosity = NOTES_MERGE_VERBOSITY_DEFAULT;
23}
24
2085b16a
JH
25static int path_to_sha1(const char *path, unsigned char *sha1)
26{
27 char hex_sha1[40];
28 int i = 0;
29 while (*path && i < 40) {
30 if (*path != '/')
31 hex_sha1[i++] = *path;
32 path++;
33 }
34 if (*path || i != 40)
35 return -1;
36 return get_sha1_hex(hex_sha1, sha1);
37}
38
39static int verify_notes_filepair(struct diff_filepair *p, unsigned char *sha1)
40{
41 switch (p->status) {
42 case DIFF_STATUS_MODIFIED:
43 assert(p->one->mode == p->two->mode);
44 assert(!is_null_sha1(p->one->sha1));
45 assert(!is_null_sha1(p->two->sha1));
46 break;
47 case DIFF_STATUS_ADDED:
48 assert(is_null_sha1(p->one->sha1));
49 break;
50 case DIFF_STATUS_DELETED:
51 assert(is_null_sha1(p->two->sha1));
52 break;
53 default:
54 return -1;
55 }
56 assert(!strcmp(p->one->path, p->two->path));
57 return path_to_sha1(p->one->path, sha1);
58}
59
60static struct notes_merge_pair *find_notes_merge_pair_pos(
61 struct notes_merge_pair *list, int len, unsigned char *obj,
62 int insert_new, int *occupied)
63{
64 /*
65 * Both diff_tree_remote() and diff_tree_local() tend to process
66 * merge_pairs in ascending order. Therefore, cache last returned
67 * index, and search sequentially from there until the appropriate
68 * position is found.
69 *
70 * Since inserts only happen from diff_tree_remote() (which mainly
71 * _appends_), we don't care that inserting into the middle of the
72 * list is expensive (using memmove()).
73 */
74 static int last_index;
75 int i = last_index < len ? last_index : len - 1;
76 int prev_cmp = 0, cmp = -1;
77 while (i >= 0 && i < len) {
78 cmp = hashcmp(obj, list[i].obj);
79 if (!cmp) /* obj belongs @ i */
80 break;
81 else if (cmp < 0 && prev_cmp <= 0) /* obj belongs < i */
82 i--;
83 else if (cmp < 0) /* obj belongs between i-1 and i */
84 break;
85 else if (cmp > 0 && prev_cmp >= 0) /* obj belongs > i */
86 i++;
87 else /* if (cmp > 0) */ { /* obj belongs between i and i+1 */
88 i++;
89 break;
90 }
91 prev_cmp = cmp;
92 }
93 if (i < 0)
94 i = 0;
95 /* obj belongs at, or immediately preceding, index i (0 <= i <= len) */
96
97 if (!cmp)
98 *occupied = 1;
99 else {
100 *occupied = 0;
101 if (insert_new && i < len) {
102 memmove(list + i + 1, list + i,
103 (len - i) * sizeof(struct notes_merge_pair));
104 memset(list + i, 0, sizeof(struct notes_merge_pair));
105 }
106 }
107 last_index = i;
108 return list + i;
109}
110
111static unsigned char uninitialized[20] =
112 "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" \
113 "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff";
114
115static struct notes_merge_pair *diff_tree_remote(struct notes_merge_options *o,
116 const unsigned char *base,
117 const unsigned char *remote,
118 int *num_changes)
119{
120 struct diff_options opt;
121 struct notes_merge_pair *changes;
122 int i, len = 0;
123
124 trace_printf("\tdiff_tree_remote(base = %.7s, remote = %.7s)\n",
125 sha1_to_hex(base), sha1_to_hex(remote));
126
127 diff_setup(&opt);
128 DIFF_OPT_SET(&opt, RECURSIVE);
129 opt.output_format = DIFF_FORMAT_NO_OUTPUT;
28452655 130 diff_setup_done(&opt);
2085b16a
JH
131 diff_tree_sha1(base, remote, "", &opt);
132 diffcore_std(&opt);
133
134 changes = xcalloc(diff_queued_diff.nr, sizeof(struct notes_merge_pair));
135
136 for (i = 0; i < diff_queued_diff.nr; i++) {
137 struct diff_filepair *p = diff_queued_diff.queue[i];
138 struct notes_merge_pair *mp;
139 int occupied;
140 unsigned char obj[20];
141
142 if (verify_notes_filepair(p, obj)) {
143 trace_printf("\t\tCannot merge entry '%s' (%c): "
144 "%.7s -> %.7s. Skipping!\n", p->one->path,
145 p->status, sha1_to_hex(p->one->sha1),
146 sha1_to_hex(p->two->sha1));
147 continue;
148 }
149 mp = find_notes_merge_pair_pos(changes, len, obj, 1, &occupied);
150 if (occupied) {
151 /* We've found an addition/deletion pair */
152 assert(!hashcmp(mp->obj, obj));
153 if (is_null_sha1(p->one->sha1)) { /* addition */
154 assert(is_null_sha1(mp->remote));
155 hashcpy(mp->remote, p->two->sha1);
156 } else if (is_null_sha1(p->two->sha1)) { /* deletion */
157 assert(is_null_sha1(mp->base));
158 hashcpy(mp->base, p->one->sha1);
159 } else
160 assert(!"Invalid existing change recorded");
161 } else {
162 hashcpy(mp->obj, obj);
163 hashcpy(mp->base, p->one->sha1);
164 hashcpy(mp->local, uninitialized);
165 hashcpy(mp->remote, p->two->sha1);
166 len++;
167 }
168 trace_printf("\t\tStored remote change for %s: %.7s -> %.7s\n",
169 sha1_to_hex(mp->obj), sha1_to_hex(mp->base),
170 sha1_to_hex(mp->remote));
171 }
172 diff_flush(&opt);
bd1928df 173 free_pathspec(&opt.pathspec);
2085b16a
JH
174
175 *num_changes = len;
176 return changes;
177}
178
179static void diff_tree_local(struct notes_merge_options *o,
180 struct notes_merge_pair *changes, int len,
181 const unsigned char *base,
182 const unsigned char *local)
183{
184 struct diff_options opt;
185 int i;
186
187 trace_printf("\tdiff_tree_local(len = %i, base = %.7s, local = %.7s)\n",
188 len, sha1_to_hex(base), sha1_to_hex(local));
189
190 diff_setup(&opt);
191 DIFF_OPT_SET(&opt, RECURSIVE);
192 opt.output_format = DIFF_FORMAT_NO_OUTPUT;
28452655 193 diff_setup_done(&opt);
2085b16a
JH
194 diff_tree_sha1(base, local, "", &opt);
195 diffcore_std(&opt);
196
197 for (i = 0; i < diff_queued_diff.nr; i++) {
198 struct diff_filepair *p = diff_queued_diff.queue[i];
199 struct notes_merge_pair *mp;
200 int match;
201 unsigned char obj[20];
202
203 if (verify_notes_filepair(p, obj)) {
204 trace_printf("\t\tCannot merge entry '%s' (%c): "
205 "%.7s -> %.7s. Skipping!\n", p->one->path,
206 p->status, sha1_to_hex(p->one->sha1),
207 sha1_to_hex(p->two->sha1));
208 continue;
209 }
210 mp = find_notes_merge_pair_pos(changes, len, obj, 0, &match);
211 if (!match) {
212 trace_printf("\t\tIgnoring local-only change for %s: "
213 "%.7s -> %.7s\n", sha1_to_hex(obj),
214 sha1_to_hex(p->one->sha1),
215 sha1_to_hex(p->two->sha1));
216 continue;
217 }
218
219 assert(!hashcmp(mp->obj, obj));
220 if (is_null_sha1(p->two->sha1)) { /* deletion */
221 /*
222 * Either this is a true deletion (1), or it is part
223 * of an A/D pair (2), or D/A pair (3):
224 *
225 * (1) mp->local is uninitialized; set it to null_sha1
226 * (2) mp->local is not uninitialized; don't touch it
227 * (3) mp->local is uninitialized; set it to null_sha1
228 * (will be overwritten by following addition)
229 */
230 if (!hashcmp(mp->local, uninitialized))
231 hashclr(mp->local);
232 } else if (is_null_sha1(p->one->sha1)) { /* addition */
233 /*
234 * Either this is a true addition (1), or it is part
235 * of an A/D pair (2), or D/A pair (3):
236 *
237 * (1) mp->local is uninitialized; set to p->two->sha1
238 * (2) mp->local is uninitialized; set to p->two->sha1
239 * (3) mp->local is null_sha1; set to p->two->sha1
240 */
241 assert(is_null_sha1(mp->local) ||
242 !hashcmp(mp->local, uninitialized));
243 hashcpy(mp->local, p->two->sha1);
244 } else { /* modification */
245 /*
246 * This is a true modification. p->one->sha1 shall
247 * match mp->base, and mp->local shall be uninitialized.
248 * Set mp->local to p->two->sha1.
249 */
250 assert(!hashcmp(p->one->sha1, mp->base));
251 assert(!hashcmp(mp->local, uninitialized));
252 hashcpy(mp->local, p->two->sha1);
253 }
254 trace_printf("\t\tStored local change for %s: %.7s -> %.7s\n",
255 sha1_to_hex(mp->obj), sha1_to_hex(mp->base),
256 sha1_to_hex(mp->local));
257 }
258 diff_flush(&opt);
bd1928df 259 free_pathspec(&opt.pathspec);
2085b16a
JH
260}
261
809f38c8
JH
262static void check_notes_merge_worktree(struct notes_merge_options *o)
263{
264 if (!o->has_worktree) {
265 /*
266 * Must establish NOTES_MERGE_WORKTREE.
267 * Abort if NOTES_MERGE_WORKTREE already exists
268 */
dabba590
JH
269 if (file_exists(git_path(NOTES_MERGE_WORKTREE)) &&
270 !is_empty_dir(git_path(NOTES_MERGE_WORKTREE))) {
809f38c8
JH
271 if (advice_resolve_conflict)
272 die("You have not concluded your previous "
273 "notes merge (%s exists).\nPlease, use "
274 "'git notes merge --commit' or 'git notes "
6abb3655 275 "merge --abort' to commit/abort the "
809f38c8
JH
276 "previous merge before you start a new "
277 "notes merge.", git_path("NOTES_MERGE_*"));
278 else
279 die("You have not concluded your notes merge "
280 "(%s exists).", git_path("NOTES_MERGE_*"));
281 }
282
dcf69262 283 if (safe_create_leading_directories_const(git_path(
809f38c8
JH
284 NOTES_MERGE_WORKTREE "/.test")))
285 die_errno("unable to create directory %s",
286 git_path(NOTES_MERGE_WORKTREE));
287 o->has_worktree = 1;
288 } else if (!file_exists(git_path(NOTES_MERGE_WORKTREE)))
289 /* NOTES_MERGE_WORKTREE should already be established */
290 die("missing '%s'. This should not happen",
291 git_path(NOTES_MERGE_WORKTREE));
292}
293
294static void write_buf_to_worktree(const unsigned char *obj,
295 const char *buf, unsigned long size)
296{
297 int fd;
fcd12db6 298 char *path = git_pathdup(NOTES_MERGE_WORKTREE "/%s", sha1_to_hex(obj));
dcf69262 299 if (safe_create_leading_directories_const(path))
809f38c8
JH
300 die_errno("unable to create directory for '%s'", path);
301 if (file_exists(path))
302 die("found existing file at '%s'", path);
303
304 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, 0666);
305 if (fd < 0)
306 die_errno("failed to open '%s'", path);
307
308 while (size > 0) {
309 long ret = write_in_full(fd, buf, size);
310 if (ret < 0) {
311 /* Ignore epipe */
312 if (errno == EPIPE)
313 break;
314 die_errno("notes-merge");
315 } else if (!ret) {
316 die("notes-merge: disk full?");
317 }
318 size -= ret;
319 buf += ret;
320 }
321
322 close(fd);
fcd12db6 323 free(path);
809f38c8
JH
324}
325
326static void write_note_to_worktree(const unsigned char *obj,
327 const unsigned char *note)
328{
329 enum object_type type;
330 unsigned long size;
331 void *buf = read_sha1_file(note, &type, &size);
332
333 if (!buf)
334 die("cannot read note %s for object %s",
335 sha1_to_hex(note), sha1_to_hex(obj));
336 if (type != OBJ_BLOB)
337 die("blob expected in note %s for object %s",
338 sha1_to_hex(note), sha1_to_hex(obj));
339 write_buf_to_worktree(obj, buf, size);
340 free(buf);
341}
342
343static int ll_merge_in_worktree(struct notes_merge_options *o,
344 struct notes_merge_pair *p)
345{
346 mmbuffer_t result_buf;
347 mmfile_t base, local, remote;
348 int status;
349
350 read_mmblob(&base, p->base);
351 read_mmblob(&local, p->local);
352 read_mmblob(&remote, p->remote);
353
354 status = ll_merge(&result_buf, sha1_to_hex(p->obj), &base, NULL,
c2e86add 355 &local, o->local_ref, &remote, o->remote_ref, NULL);
809f38c8
JH
356
357 free(base.ptr);
358 free(local.ptr);
359 free(remote.ptr);
360
361 if ((status < 0) || !result_buf.ptr)
362 die("Failed to execute internal merge");
363
364 write_buf_to_worktree(p->obj, result_buf.ptr, result_buf.size);
365 free(result_buf.ptr);
366
367 return status;
368}
369
370static int merge_one_change_manual(struct notes_merge_options *o,
371 struct notes_merge_pair *p,
372 struct notes_tree *t)
373{
374 const char *lref = o->local_ref ? o->local_ref : "local version";
375 const char *rref = o->remote_ref ? o->remote_ref : "remote version";
376
377 trace_printf("\t\t\tmerge_one_change_manual(obj = %.7s, base = %.7s, "
378 "local = %.7s, remote = %.7s)\n",
379 sha1_to_hex(p->obj), sha1_to_hex(p->base),
380 sha1_to_hex(p->local), sha1_to_hex(p->remote));
381
443259cf
JH
382 /* add "Conflicts:" section to commit message first time through */
383 if (!o->has_worktree)
384 strbuf_addstr(&(o->commit_msg), "\n\nConflicts:\n");
385
386 strbuf_addf(&(o->commit_msg), "\t%s\n", sha1_to_hex(p->obj));
387
5f9f8d15
JN
388 if (o->verbosity >= 2)
389 printf("Auto-merging notes for %s\n", sha1_to_hex(p->obj));
809f38c8
JH
390 check_notes_merge_worktree(o);
391 if (is_null_sha1(p->local)) {
392 /* D/F conflict, checkout p->remote */
393 assert(!is_null_sha1(p->remote));
5f9f8d15
JN
394 if (o->verbosity >= 1)
395 printf("CONFLICT (delete/modify): Notes for object %s "
396 "deleted in %s and modified in %s. Version from %s "
397 "left in tree.\n",
398 sha1_to_hex(p->obj), lref, rref, rref);
809f38c8
JH
399 write_note_to_worktree(p->obj, p->remote);
400 } else if (is_null_sha1(p->remote)) {
401 /* D/F conflict, checkout p->local */
402 assert(!is_null_sha1(p->local));
5f9f8d15
JN
403 if (o->verbosity >= 1)
404 printf("CONFLICT (delete/modify): Notes for object %s "
405 "deleted in %s and modified in %s. Version from %s "
406 "left in tree.\n",
407 sha1_to_hex(p->obj), rref, lref, lref);
809f38c8
JH
408 write_note_to_worktree(p->obj, p->local);
409 } else {
410 /* "regular" conflict, checkout result of ll_merge() */
411 const char *reason = "content";
412 if (is_null_sha1(p->base))
413 reason = "add/add";
414 assert(!is_null_sha1(p->local));
415 assert(!is_null_sha1(p->remote));
5f9f8d15
JN
416 if (o->verbosity >= 1)
417 printf("CONFLICT (%s): Merge conflict in notes for "
418 "object %s\n", reason, sha1_to_hex(p->obj));
809f38c8
JH
419 ll_merge_in_worktree(o, p);
420 }
421
422 trace_printf("\t\t\tremoving from partial merge result\n");
423 remove_note(t, p->obj);
424
425 return 1;
426}
427
3228e671
JH
428static int merge_one_change(struct notes_merge_options *o,
429 struct notes_merge_pair *p, struct notes_tree *t)
430{
431 /*
809f38c8
JH
432 * Return 0 if change is successfully resolved (stored in notes_tree).
433 * Return 1 is change results in a conflict (NOT stored in notes_tree,
434 * but instead written to NOTES_MERGE_WORKTREE with conflict markers).
3228e671
JH
435 */
436 switch (o->strategy) {
437 case NOTES_MERGE_RESOLVE_MANUAL:
809f38c8 438 return merge_one_change_manual(o, p, t);
3228e671 439 case NOTES_MERGE_RESOLVE_OURS:
5f9f8d15
JN
440 if (o->verbosity >= 2)
441 printf("Using local notes for %s\n",
442 sha1_to_hex(p->obj));
3228e671
JH
443 /* nothing to do */
444 return 0;
445 case NOTES_MERGE_RESOLVE_THEIRS:
5f9f8d15
JN
446 if (o->verbosity >= 2)
447 printf("Using remote notes for %s\n",
448 sha1_to_hex(p->obj));
3228e671
JH
449 if (add_note(t, p->obj, p->remote, combine_notes_overwrite))
450 die("BUG: combine_notes_overwrite failed");
451 return 0;
452 case NOTES_MERGE_RESOLVE_UNION:
5f9f8d15
JN
453 if (o->verbosity >= 2)
454 printf("Concatenating local and remote notes for %s\n",
455 sha1_to_hex(p->obj));
3228e671
JH
456 if (add_note(t, p->obj, p->remote, combine_notes_concatenate))
457 die("failed to concatenate notes "
458 "(combine_notes_concatenate)");
459 return 0;
a6a09095 460 case NOTES_MERGE_RESOLVE_CAT_SORT_UNIQ:
5f9f8d15
JN
461 if (o->verbosity >= 2)
462 printf("Concatenating unique lines in local and remote "
463 "notes for %s\n", sha1_to_hex(p->obj));
a6a09095
JH
464 if (add_note(t, p->obj, p->remote, combine_notes_cat_sort_uniq))
465 die("failed to concatenate notes "
466 "(combine_notes_cat_sort_uniq)");
467 return 0;
3228e671
JH
468 }
469 die("Unknown strategy (%i).", o->strategy);
470}
471
2085b16a
JH
472static int merge_changes(struct notes_merge_options *o,
473 struct notes_merge_pair *changes, int *num_changes,
474 struct notes_tree *t)
475{
476 int i, conflicts = 0;
477
478 trace_printf("\tmerge_changes(num_changes = %i)\n", *num_changes);
479 for (i = 0; i < *num_changes; i++) {
480 struct notes_merge_pair *p = changes + i;
481 trace_printf("\t\t%.7s: %.7s -> %.7s/%.7s\n",
482 sha1_to_hex(p->obj), sha1_to_hex(p->base),
483 sha1_to_hex(p->local), sha1_to_hex(p->remote));
484
485 if (!hashcmp(p->base, p->remote)) {
486 /* no remote change; nothing to do */
487 trace_printf("\t\t\tskipping (no remote change)\n");
488 } else if (!hashcmp(p->local, p->remote)) {
489 /* same change in local and remote; nothing to do */
490 trace_printf("\t\t\tskipping (local == remote)\n");
491 } else if (!hashcmp(p->local, uninitialized) ||
492 !hashcmp(p->local, p->base)) {
493 /* no local change; adopt remote change */
494 trace_printf("\t\t\tno local change, adopted remote\n");
495 if (add_note(t, p->obj, p->remote,
496 combine_notes_overwrite))
497 die("BUG: combine_notes_overwrite failed");
498 } else {
499 /* need file-level merge between local and remote */
500 trace_printf("\t\t\tneed content-level merge\n");
3228e671 501 conflicts += merge_one_change(o, p, t);
2085b16a
JH
502 }
503 }
504
505 return conflicts;
506}
507
508static int merge_from_diffs(struct notes_merge_options *o,
509 const unsigned char *base,
510 const unsigned char *local,
511 const unsigned char *remote, struct notes_tree *t)
512{
513 struct notes_merge_pair *changes;
514 int num_changes, conflicts;
515
516 trace_printf("\tmerge_from_diffs(base = %.7s, local = %.7s, "
517 "remote = %.7s)\n", sha1_to_hex(base), sha1_to_hex(local),
518 sha1_to_hex(remote));
519
520 changes = diff_tree_remote(o, base, remote, &num_changes);
521 diff_tree_local(o, changes, num_changes, base, local);
522
523 conflicts = merge_changes(o, changes, &num_changes, t);
524 free(changes);
525
5f9f8d15 526 if (o->verbosity >= 4)
2ca0c53b
NTND
527 printf(t->dirty ?
528 "Merge result: %i unmerged notes and a dirty notes tree\n" :
529 "Merge result: %i unmerged notes and a clean notes tree\n",
530 conflicts);
2085b16a
JH
531
532 return conflicts ? -1 : 1;
533}
534
75ef3f4a 535int notes_merge(struct notes_merge_options *o,
2085b16a 536 struct notes_tree *local_tree,
75ef3f4a
JH
537 unsigned char *result_sha1)
538{
539 unsigned char local_sha1[20], remote_sha1[20];
540 struct commit *local, *remote;
541 struct commit_list *bases = NULL;
2085b16a 542 const unsigned char *base_sha1, *base_tree_sha1;
75ef3f4a
JH
543 int result = 0;
544
545 assert(o->local_ref && o->remote_ref);
2085b16a 546 assert(!strcmp(o->local_ref, local_tree->ref));
75ef3f4a
JH
547 hashclr(result_sha1);
548
549 trace_printf("notes_merge(o->local_ref = %s, o->remote_ref = %s)\n",
550 o->local_ref, o->remote_ref);
551
552 /* Dereference o->local_ref into local_sha1 */
7695d118 553 if (read_ref_full(o->local_ref, 0, local_sha1, NULL))
75ef3f4a 554 die("Failed to resolve local notes ref '%s'", o->local_ref);
8d9c5010
MH
555 else if (!check_refname_format(o->local_ref, 0) &&
556 is_null_sha1(local_sha1))
75ef3f4a
JH
557 local = NULL; /* local_sha1 == null_sha1 indicates unborn ref */
558 else if (!(local = lookup_commit_reference(local_sha1)))
559 die("Could not parse local commit %s (%s)",
560 sha1_to_hex(local_sha1), o->local_ref);
561 trace_printf("\tlocal commit: %.7s\n", sha1_to_hex(local_sha1));
562
563 /* Dereference o->remote_ref into remote_sha1 */
564 if (get_sha1(o->remote_ref, remote_sha1)) {
565 /*
566 * Failed to get remote_sha1. If o->remote_ref looks like an
567 * unborn ref, perform the merge using an empty notes tree.
568 */
8d9c5010 569 if (!check_refname_format(o->remote_ref, 0)) {
75ef3f4a
JH
570 hashclr(remote_sha1);
571 remote = NULL;
572 } else {
573 die("Failed to resolve remote notes ref '%s'",
574 o->remote_ref);
575 }
576 } else if (!(remote = lookup_commit_reference(remote_sha1))) {
577 die("Could not parse remote commit %s (%s)",
578 sha1_to_hex(remote_sha1), o->remote_ref);
579 }
580 trace_printf("\tremote commit: %.7s\n", sha1_to_hex(remote_sha1));
581
582 if (!local && !remote)
583 die("Cannot merge empty notes ref (%s) into empty notes ref "
584 "(%s)", o->remote_ref, o->local_ref);
585 if (!local) {
586 /* result == remote commit */
587 hashcpy(result_sha1, remote_sha1);
588 goto found_result;
589 }
590 if (!remote) {
591 /* result == local commit */
592 hashcpy(result_sha1, local_sha1);
593 goto found_result;
594 }
595 assert(local && remote);
596
597 /* Find merge bases */
2ce406cc 598 bases = get_merge_bases(local, remote);
75ef3f4a
JH
599 if (!bases) {
600 base_sha1 = null_sha1;
dab0d410 601 base_tree_sha1 = EMPTY_TREE_SHA1_BIN;
5f9f8d15
JN
602 if (o->verbosity >= 4)
603 printf("No merge base found; doing history-less merge\n");
75ef3f4a 604 } else if (!bases->next) {
7999b2cf 605 base_sha1 = get_object_hash(bases->item->object);
606 base_tree_sha1 = get_object_hash(bases->item->tree->object);
5f9f8d15
JN
607 if (o->verbosity >= 4)
608 printf("One merge base found (%.7s)\n",
609 sha1_to_hex(base_sha1));
75ef3f4a
JH
610 } else {
611 /* TODO: How to handle multiple merge-bases? */
7999b2cf 612 base_sha1 = get_object_hash(bases->item->object);
613 base_tree_sha1 = get_object_hash(bases->item->tree->object);
5f9f8d15
JN
614 if (o->verbosity >= 3)
615 printf("Multiple merge bases found. Using the first "
616 "(%.7s)\n", sha1_to_hex(base_sha1));
75ef3f4a
JH
617 }
618
5f9f8d15
JN
619 if (o->verbosity >= 4)
620 printf("Merging remote commit %.7s into local commit %.7s with "
f2fd0760 621 "merge-base %.7s\n", oid_to_hex(&remote->object.oid),
622 oid_to_hex(&local->object.oid),
5f9f8d15 623 sha1_to_hex(base_sha1));
75ef3f4a 624
7999b2cf 625 if (!hashcmp(get_object_hash(remote->object), base_sha1)) {
75ef3f4a 626 /* Already merged; result == local commit */
5f9f8d15
JN
627 if (o->verbosity >= 2)
628 printf("Already up-to-date!\n");
7999b2cf 629 hashcpy(result_sha1, get_object_hash(local->object));
75ef3f4a
JH
630 goto found_result;
631 }
7999b2cf 632 if (!hashcmp(get_object_hash(local->object), base_sha1)) {
75ef3f4a 633 /* Fast-forward; result == remote commit */
5f9f8d15
JN
634 if (o->verbosity >= 2)
635 printf("Fast-forward\n");
7999b2cf 636 hashcpy(result_sha1, get_object_hash(remote->object));
75ef3f4a
JH
637 goto found_result;
638 }
639
7999b2cf 640 result = merge_from_diffs(o, base_tree_sha1, get_object_hash(local->tree->object),
641 get_object_hash(remote->tree->object), local_tree);
2085b16a 642
809f38c8
JH
643 if (result != 0) { /* non-trivial merge (with or without conflicts) */
644 /* Commit (partial) result */
2085b16a
JH
645 struct commit_list *parents = NULL;
646 commit_list_insert(remote, &parents); /* LIFO order */
647 commit_list_insert(local, &parents);
3ffefb54
JK
648 create_notes_commit(local_tree, parents,
649 o->commit_msg.buf, o->commit_msg.len,
2085b16a
JH
650 result_sha1);
651 }
75ef3f4a
JH
652
653found_result:
654 free_commit_list(bases);
443259cf 655 strbuf_release(&(o->commit_msg));
75ef3f4a
JH
656 trace_printf("notes_merge(): result = %i, result_sha1 = %.7s\n",
657 result, sha1_to_hex(result_sha1));
658 return result;
659}
6abb3655
JH
660
661int notes_merge_commit(struct notes_merge_options *o,
662 struct notes_tree *partial_tree,
663 struct commit *partial_commit,
664 unsigned char *result_sha1)
665{
666 /*
667 * Iterate through files in .git/NOTES_MERGE_WORKTREE and add all
a0be62c1 668 * found notes to 'partial_tree'. Write the updated notes tree to
6abb3655
JH
669 * the DB, and commit the resulting tree object while reusing the
670 * commit message and parents from 'partial_commit'.
671 * Finally store the new commit object SHA1 into 'result_sha1'.
672 */
a0be62c1
JH
673 DIR *dir;
674 struct dirent *e;
675 struct strbuf path = STRBUF_INIT;
8597ea3a 676 const char *buffer = get_commit_buffer(partial_commit, NULL);
bc6b8fc1 677 const char *msg = strstr(buffer, "\n\n");
a0be62c1 678 int baselen;
6abb3655 679
a0be62c1 680 strbuf_addstr(&path, git_path(NOTES_MERGE_WORKTREE));
5f9f8d15 681 if (o->verbosity >= 3)
a0be62c1
JH
682 printf("Committing notes in notes merge worktree at %s\n",
683 path.buf);
6abb3655
JH
684
685 if (!msg || msg[2] == '\0')
686 die("partial notes commit has empty message");
687 msg += 2;
688
a0be62c1
JH
689 dir = opendir(path.buf);
690 if (!dir)
691 die_errno("could not open %s", path.buf);
692
693 strbuf_addch(&path, '/');
694 baselen = path.len;
695 while ((e = readdir(dir)) != NULL) {
6abb3655 696 struct stat st;
6abb3655
JH
697 unsigned char obj_sha1[20], blob_sha1[20];
698
a0be62c1
JH
699 if (is_dot_or_dotdot(e->d_name))
700 continue;
701
702 if (strlen(e->d_name) != 40 || get_sha1_hex(e->d_name, obj_sha1)) {
5f9f8d15 703 if (o->verbosity >= 3)
a0be62c1
JH
704 printf("Skipping non-SHA1 entry '%s%s'\n",
705 path.buf, e->d_name);
6abb3655
JH
706 continue;
707 }
708
a0be62c1 709 strbuf_addstr(&path, e->d_name);
6abb3655 710 /* write file as blob, and add to partial_tree */
a0be62c1
JH
711 if (stat(path.buf, &st))
712 die_errno("Failed to stat '%s'", path.buf);
713 if (index_path(blob_sha1, path.buf, &st, HASH_WRITE_OBJECT))
714 die("Failed to write blob object from '%s'", path.buf);
6abb3655
JH
715 if (add_note(partial_tree, obj_sha1, blob_sha1, NULL))
716 die("Failed to add resolved note '%s' to notes tree",
a0be62c1 717 path.buf);
5f9f8d15
JN
718 if (o->verbosity >= 4)
719 printf("Added resolved note for object %s: %s\n",
720 sha1_to_hex(obj_sha1), sha1_to_hex(blob_sha1));
a0be62c1 721 strbuf_setlen(&path, baselen);
6abb3655
JH
722 }
723
3ffefb54 724 create_notes_commit(partial_tree, partial_commit->parents,
e6dfcd67 725 msg, strlen(msg), result_sha1);
bc6b8fc1 726 unuse_commit_buffer(partial_commit, buffer);
5f9f8d15
JN
727 if (o->verbosity >= 4)
728 printf("Finalized notes merge commit: %s\n",
729 sha1_to_hex(result_sha1));
a0be62c1
JH
730 strbuf_release(&path);
731 closedir(dir);
6abb3655
JH
732 return 0;
733}
734
735int notes_merge_abort(struct notes_merge_options *o)
736{
dabba590
JH
737 /*
738 * Remove all files within .git/NOTES_MERGE_WORKTREE. We do not remove
739 * the .git/NOTES_MERGE_WORKTREE directory itself, since it might be
740 * the current working directory of the user.
741 */
6abb3655
JH
742 struct strbuf buf = STRBUF_INIT;
743 int ret;
744
745 strbuf_addstr(&buf, git_path(NOTES_MERGE_WORKTREE));
5f9f8d15 746 if (o->verbosity >= 3)
dabba590
JH
747 printf("Removing notes merge worktree at %s/*\n", buf.buf);
748 ret = remove_dir_recursively(&buf, REMOVE_DIR_KEEP_TOPLEVEL);
6abb3655
JH
749 strbuf_release(&buf);
750 return ret;
751}