reflog: remove i18n legos in pruning message
[git/git.git] / notes-merge.c
CommitLineData
75ef3f4a
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1#include "cache.h"
2#include "commit.h"
3#include "refs.h"
2085b16a
JH
4#include "diff.h"
5#include "diffcore.h"
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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"
75ef3f4a 12
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13struct notes_merge_pair {
14 unsigned char obj[20], base[20], local[20], remote[20];
15};
16
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17void init_notes_merge_options(struct notes_merge_options *o)
18{
19 memset(o, 0, sizeof(struct notes_merge_options));
443259cf 20 strbuf_init(&(o->commit_msg), 0);
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21 o->verbosity = NOTES_MERGE_VERBOSITY_DEFAULT;
22}
23
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24static int path_to_sha1(const char *path, unsigned char *sha1)
25{
26 char hex_sha1[40];
27 int i = 0;
28 while (*path && i < 40) {
29 if (*path != '/')
30 hex_sha1[i++] = *path;
31 path++;
32 }
33 if (*path || i != 40)
34 return -1;
35 return get_sha1_hex(hex_sha1, sha1);
36}
37
38static int verify_notes_filepair(struct diff_filepair *p, unsigned char *sha1)
39{
40 switch (p->status) {
41 case DIFF_STATUS_MODIFIED:
42 assert(p->one->mode == p->two->mode);
43 assert(!is_null_sha1(p->one->sha1));
44 assert(!is_null_sha1(p->two->sha1));
45 break;
46 case DIFF_STATUS_ADDED:
47 assert(is_null_sha1(p->one->sha1));
48 break;
49 case DIFF_STATUS_DELETED:
50 assert(is_null_sha1(p->two->sha1));
51 break;
52 default:
53 return -1;
54 }
55 assert(!strcmp(p->one->path, p->two->path));
56 return path_to_sha1(p->one->path, sha1);
57}
58
59static struct notes_merge_pair *find_notes_merge_pair_pos(
60 struct notes_merge_pair *list, int len, unsigned char *obj,
61 int insert_new, int *occupied)
62{
63 /*
64 * Both diff_tree_remote() and diff_tree_local() tend to process
65 * merge_pairs in ascending order. Therefore, cache last returned
66 * index, and search sequentially from there until the appropriate
67 * position is found.
68 *
69 * Since inserts only happen from diff_tree_remote() (which mainly
70 * _appends_), we don't care that inserting into the middle of the
71 * list is expensive (using memmove()).
72 */
73 static int last_index;
74 int i = last_index < len ? last_index : len - 1;
75 int prev_cmp = 0, cmp = -1;
76 while (i >= 0 && i < len) {
77 cmp = hashcmp(obj, list[i].obj);
78 if (!cmp) /* obj belongs @ i */
79 break;
80 else if (cmp < 0 && prev_cmp <= 0) /* obj belongs < i */
81 i--;
82 else if (cmp < 0) /* obj belongs between i-1 and i */
83 break;
84 else if (cmp > 0 && prev_cmp >= 0) /* obj belongs > i */
85 i++;
86 else /* if (cmp > 0) */ { /* obj belongs between i and i+1 */
87 i++;
88 break;
89 }
90 prev_cmp = cmp;
91 }
92 if (i < 0)
93 i = 0;
94 /* obj belongs at, or immediately preceding, index i (0 <= i <= len) */
95
96 if (!cmp)
97 *occupied = 1;
98 else {
99 *occupied = 0;
100 if (insert_new && i < len) {
101 memmove(list + i + 1, list + i,
102 (len - i) * sizeof(struct notes_merge_pair));
103 memset(list + i, 0, sizeof(struct notes_merge_pair));
104 }
105 }
106 last_index = i;
107 return list + i;
108}
109
110static unsigned char uninitialized[20] =
111 "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" \
112 "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff";
113
114static struct notes_merge_pair *diff_tree_remote(struct notes_merge_options *o,
115 const unsigned char *base,
116 const unsigned char *remote,
117 int *num_changes)
118{
119 struct diff_options opt;
120 struct notes_merge_pair *changes;
121 int i, len = 0;
122
123 trace_printf("\tdiff_tree_remote(base = %.7s, remote = %.7s)\n",
124 sha1_to_hex(base), sha1_to_hex(remote));
125
126 diff_setup(&opt);
127 DIFF_OPT_SET(&opt, RECURSIVE);
128 opt.output_format = DIFF_FORMAT_NO_OUTPUT;
129 if (diff_setup_done(&opt) < 0)
130 die("diff_setup_done failed");
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);
173 diff_tree_release_paths(&opt);
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;
193 if (diff_setup_done(&opt) < 0)
194 die("diff_setup_done failed");
195 diff_tree_sha1(base, local, "", &opt);
196 diffcore_std(&opt);
197
198 for (i = 0; i < diff_queued_diff.nr; i++) {
199 struct diff_filepair *p = diff_queued_diff.queue[i];
200 struct notes_merge_pair *mp;
201 int match;
202 unsigned char obj[20];
203
204 if (verify_notes_filepair(p, obj)) {
205 trace_printf("\t\tCannot merge entry '%s' (%c): "
206 "%.7s -> %.7s. Skipping!\n", p->one->path,
207 p->status, sha1_to_hex(p->one->sha1),
208 sha1_to_hex(p->two->sha1));
209 continue;
210 }
211 mp = find_notes_merge_pair_pos(changes, len, obj, 0, &match);
212 if (!match) {
213 trace_printf("\t\tIgnoring local-only change for %s: "
214 "%.7s -> %.7s\n", sha1_to_hex(obj),
215 sha1_to_hex(p->one->sha1),
216 sha1_to_hex(p->two->sha1));
217 continue;
218 }
219
220 assert(!hashcmp(mp->obj, obj));
221 if (is_null_sha1(p->two->sha1)) { /* deletion */
222 /*
223 * Either this is a true deletion (1), or it is part
224 * of an A/D pair (2), or D/A pair (3):
225 *
226 * (1) mp->local is uninitialized; set it to null_sha1
227 * (2) mp->local is not uninitialized; don't touch it
228 * (3) mp->local is uninitialized; set it to null_sha1
229 * (will be overwritten by following addition)
230 */
231 if (!hashcmp(mp->local, uninitialized))
232 hashclr(mp->local);
233 } else if (is_null_sha1(p->one->sha1)) { /* addition */
234 /*
235 * Either this is a true addition (1), or it is part
236 * of an A/D pair (2), or D/A pair (3):
237 *
238 * (1) mp->local is uninitialized; set to p->two->sha1
239 * (2) mp->local is uninitialized; set to p->two->sha1
240 * (3) mp->local is null_sha1; set to p->two->sha1
241 */
242 assert(is_null_sha1(mp->local) ||
243 !hashcmp(mp->local, uninitialized));
244 hashcpy(mp->local, p->two->sha1);
245 } else { /* modification */
246 /*
247 * This is a true modification. p->one->sha1 shall
248 * match mp->base, and mp->local shall be uninitialized.
249 * Set mp->local to p->two->sha1.
250 */
251 assert(!hashcmp(p->one->sha1, mp->base));
252 assert(!hashcmp(mp->local, uninitialized));
253 hashcpy(mp->local, p->two->sha1);
254 }
255 trace_printf("\t\tStored local change for %s: %.7s -> %.7s\n",
256 sha1_to_hex(mp->obj), sha1_to_hex(mp->base),
257 sha1_to_hex(mp->local));
258 }
259 diff_flush(&opt);
260 diff_tree_release_paths(&opt);
261}
262
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263static void check_notes_merge_worktree(struct notes_merge_options *o)
264{
265 if (!o->has_worktree) {
266 /*
267 * Must establish NOTES_MERGE_WORKTREE.
268 * Abort if NOTES_MERGE_WORKTREE already exists
269 */
dabba590
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270 if (file_exists(git_path(NOTES_MERGE_WORKTREE)) &&
271 !is_empty_dir(git_path(NOTES_MERGE_WORKTREE))) {
809f38c8
JH
272 if (advice_resolve_conflict)
273 die("You have not concluded your previous "
274 "notes merge (%s exists).\nPlease, use "
275 "'git notes merge --commit' or 'git notes "
6abb3655 276 "merge --abort' to commit/abort the "
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277 "previous merge before you start a new "
278 "notes merge.", git_path("NOTES_MERGE_*"));
279 else
280 die("You have not concluded your notes merge "
281 "(%s exists).", git_path("NOTES_MERGE_*"));
282 }
283
284 if (safe_create_leading_directories(git_path(
285 NOTES_MERGE_WORKTREE "/.test")))
286 die_errno("unable to create directory %s",
287 git_path(NOTES_MERGE_WORKTREE));
288 o->has_worktree = 1;
289 } else if (!file_exists(git_path(NOTES_MERGE_WORKTREE)))
290 /* NOTES_MERGE_WORKTREE should already be established */
291 die("missing '%s'. This should not happen",
292 git_path(NOTES_MERGE_WORKTREE));
293}
294
295static void write_buf_to_worktree(const unsigned char *obj,
296 const char *buf, unsigned long size)
297{
298 int fd;
299 char *path = git_path(NOTES_MERGE_WORKTREE "/%s", sha1_to_hex(obj));
300 if (safe_create_leading_directories(path))
301 die_errno("unable to create directory for '%s'", path);
302 if (file_exists(path))
303 die("found existing file at '%s'", path);
304
305 fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, 0666);
306 if (fd < 0)
307 die_errno("failed to open '%s'", path);
308
309 while (size > 0) {
310 long ret = write_in_full(fd, buf, size);
311 if (ret < 0) {
312 /* Ignore epipe */
313 if (errno == EPIPE)
314 break;
315 die_errno("notes-merge");
316 } else if (!ret) {
317 die("notes-merge: disk full?");
318 }
319 size -= ret;
320 buf += ret;
321 }
322
323 close(fd);
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
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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
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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
JN
526 if (o->verbosity >= 4)
527 printf("Merge result: %i unmerged notes and a %s notes tree\n",
528 conflicts, t->dirty ? "dirty" : "clean");
2085b16a
JH
529
530 return conflicts ? -1 : 1;
531}
532
56881843 533void create_notes_commit(struct notes_tree *t, struct commit_list *parents,
13f8b72d 534 const struct strbuf *msg, unsigned char *result_sha1)
56881843
JH
535{
536 unsigned char tree_sha1[20];
537
538 assert(t->initialized);
539
540 if (write_notes_tree(t, tree_sha1))
541 die("Failed to write notes tree to database");
542
543 if (!parents) {
544 /* Deduce parent commit from t->ref */
545 unsigned char parent_sha1[20];
546 if (!read_ref(t->ref, parent_sha1)) {
547 struct commit *parent = lookup_commit(parent_sha1);
548 if (!parent || parse_commit(parent))
549 die("Failed to find/parse commit %s", t->ref);
550 commit_list_insert(parent, &parents);
551 }
552 /* else: t->ref points to nothing, assume root/orphan commit */
553 }
554
ba3c69a9 555 if (commit_tree(msg, tree_sha1, parents, result_sha1, NULL, NULL))
56881843
JH
556 die("Failed to commit notes tree to database");
557}
558
75ef3f4a 559int notes_merge(struct notes_merge_options *o,
2085b16a 560 struct notes_tree *local_tree,
75ef3f4a
JH
561 unsigned char *result_sha1)
562{
563 unsigned char local_sha1[20], remote_sha1[20];
564 struct commit *local, *remote;
565 struct commit_list *bases = NULL;
2085b16a 566 const unsigned char *base_sha1, *base_tree_sha1;
75ef3f4a
JH
567 int result = 0;
568
569 assert(o->local_ref && o->remote_ref);
2085b16a 570 assert(!strcmp(o->local_ref, local_tree->ref));
75ef3f4a
JH
571 hashclr(result_sha1);
572
573 trace_printf("notes_merge(o->local_ref = %s, o->remote_ref = %s)\n",
574 o->local_ref, o->remote_ref);
575
576 /* Dereference o->local_ref into local_sha1 */
c6893323 577 if (read_ref_full(o->local_ref, local_sha1, 0, NULL))
75ef3f4a 578 die("Failed to resolve local notes ref '%s'", o->local_ref);
8d9c5010
MH
579 else if (!check_refname_format(o->local_ref, 0) &&
580 is_null_sha1(local_sha1))
75ef3f4a
JH
581 local = NULL; /* local_sha1 == null_sha1 indicates unborn ref */
582 else if (!(local = lookup_commit_reference(local_sha1)))
583 die("Could not parse local commit %s (%s)",
584 sha1_to_hex(local_sha1), o->local_ref);
585 trace_printf("\tlocal commit: %.7s\n", sha1_to_hex(local_sha1));
586
587 /* Dereference o->remote_ref into remote_sha1 */
588 if (get_sha1(o->remote_ref, remote_sha1)) {
589 /*
590 * Failed to get remote_sha1. If o->remote_ref looks like an
591 * unborn ref, perform the merge using an empty notes tree.
592 */
8d9c5010 593 if (!check_refname_format(o->remote_ref, 0)) {
75ef3f4a
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594 hashclr(remote_sha1);
595 remote = NULL;
596 } else {
597 die("Failed to resolve remote notes ref '%s'",
598 o->remote_ref);
599 }
600 } else if (!(remote = lookup_commit_reference(remote_sha1))) {
601 die("Could not parse remote commit %s (%s)",
602 sha1_to_hex(remote_sha1), o->remote_ref);
603 }
604 trace_printf("\tremote commit: %.7s\n", sha1_to_hex(remote_sha1));
605
606 if (!local && !remote)
607 die("Cannot merge empty notes ref (%s) into empty notes ref "
608 "(%s)", o->remote_ref, o->local_ref);
609 if (!local) {
610 /* result == remote commit */
611 hashcpy(result_sha1, remote_sha1);
612 goto found_result;
613 }
614 if (!remote) {
615 /* result == local commit */
616 hashcpy(result_sha1, local_sha1);
617 goto found_result;
618 }
619 assert(local && remote);
620
621 /* Find merge bases */
622 bases = get_merge_bases(local, remote, 1);
623 if (!bases) {
624 base_sha1 = null_sha1;
dab0d410 625 base_tree_sha1 = EMPTY_TREE_SHA1_BIN;
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626 if (o->verbosity >= 4)
627 printf("No merge base found; doing history-less merge\n");
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628 } else if (!bases->next) {
629 base_sha1 = bases->item->object.sha1;
2085b16a 630 base_tree_sha1 = bases->item->tree->object.sha1;
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631 if (o->verbosity >= 4)
632 printf("One merge base found (%.7s)\n",
633 sha1_to_hex(base_sha1));
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634 } else {
635 /* TODO: How to handle multiple merge-bases? */
636 base_sha1 = bases->item->object.sha1;
2085b16a 637 base_tree_sha1 = bases->item->tree->object.sha1;
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638 if (o->verbosity >= 3)
639 printf("Multiple merge bases found. Using the first "
640 "(%.7s)\n", sha1_to_hex(base_sha1));
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641 }
642
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643 if (o->verbosity >= 4)
644 printf("Merging remote commit %.7s into local commit %.7s with "
645 "merge-base %.7s\n", sha1_to_hex(remote->object.sha1),
646 sha1_to_hex(local->object.sha1),
647 sha1_to_hex(base_sha1));
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648
649 if (!hashcmp(remote->object.sha1, base_sha1)) {
650 /* Already merged; result == local commit */
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JN
651 if (o->verbosity >= 2)
652 printf("Already up-to-date!\n");
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653 hashcpy(result_sha1, local->object.sha1);
654 goto found_result;
655 }
656 if (!hashcmp(local->object.sha1, base_sha1)) {
657 /* Fast-forward; result == remote commit */
5f9f8d15
JN
658 if (o->verbosity >= 2)
659 printf("Fast-forward\n");
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660 hashcpy(result_sha1, remote->object.sha1);
661 goto found_result;
662 }
663
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JH
664 result = merge_from_diffs(o, base_tree_sha1, local->tree->object.sha1,
665 remote->tree->object.sha1, local_tree);
666
809f38c8
JH
667 if (result != 0) { /* non-trivial merge (with or without conflicts) */
668 /* Commit (partial) result */
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JH
669 struct commit_list *parents = NULL;
670 commit_list_insert(remote, &parents); /* LIFO order */
671 commit_list_insert(local, &parents);
13f8b72d 672 create_notes_commit(local_tree, parents, &o->commit_msg,
2085b16a
JH
673 result_sha1);
674 }
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675
676found_result:
677 free_commit_list(bases);
443259cf 678 strbuf_release(&(o->commit_msg));
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679 trace_printf("notes_merge(): result = %i, result_sha1 = %.7s\n",
680 result, sha1_to_hex(result_sha1));
681 return result;
682}
6abb3655
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683
684int notes_merge_commit(struct notes_merge_options *o,
685 struct notes_tree *partial_tree,
686 struct commit *partial_commit,
687 unsigned char *result_sha1)
688{
689 /*
690 * Iterate through files in .git/NOTES_MERGE_WORKTREE and add all
a0be62c1 691 * found notes to 'partial_tree'. Write the updated notes tree to
6abb3655
JH
692 * the DB, and commit the resulting tree object while reusing the
693 * commit message and parents from 'partial_commit'.
694 * Finally store the new commit object SHA1 into 'result_sha1'.
695 */
a0be62c1
JH
696 DIR *dir;
697 struct dirent *e;
698 struct strbuf path = STRBUF_INIT;
13f8b72d
NTND
699 char *msg = strstr(partial_commit->buffer, "\n\n");
700 struct strbuf sb_msg = STRBUF_INIT;
a0be62c1 701 int baselen;
6abb3655 702
a0be62c1 703 strbuf_addstr(&path, git_path(NOTES_MERGE_WORKTREE));
5f9f8d15 704 if (o->verbosity >= 3)
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705 printf("Committing notes in notes merge worktree at %s\n",
706 path.buf);
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707
708 if (!msg || msg[2] == '\0')
709 die("partial notes commit has empty message");
710 msg += 2;
711
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712 dir = opendir(path.buf);
713 if (!dir)
714 die_errno("could not open %s", path.buf);
715
716 strbuf_addch(&path, '/');
717 baselen = path.len;
718 while ((e = readdir(dir)) != NULL) {
6abb3655 719 struct stat st;
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720 unsigned char obj_sha1[20], blob_sha1[20];
721
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722 if (is_dot_or_dotdot(e->d_name))
723 continue;
724
725 if (strlen(e->d_name) != 40 || get_sha1_hex(e->d_name, obj_sha1)) {
5f9f8d15 726 if (o->verbosity >= 3)
a0be62c1
JH
727 printf("Skipping non-SHA1 entry '%s%s'\n",
728 path.buf, e->d_name);
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729 continue;
730 }
731
a0be62c1 732 strbuf_addstr(&path, e->d_name);
6abb3655 733 /* write file as blob, and add to partial_tree */
a0be62c1
JH
734 if (stat(path.buf, &st))
735 die_errno("Failed to stat '%s'", path.buf);
736 if (index_path(blob_sha1, path.buf, &st, HASH_WRITE_OBJECT))
737 die("Failed to write blob object from '%s'", path.buf);
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JH
738 if (add_note(partial_tree, obj_sha1, blob_sha1, NULL))
739 die("Failed to add resolved note '%s' to notes tree",
a0be62c1 740 path.buf);
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JN
741 if (o->verbosity >= 4)
742 printf("Added resolved note for object %s: %s\n",
743 sha1_to_hex(obj_sha1), sha1_to_hex(blob_sha1));
a0be62c1 744 strbuf_setlen(&path, baselen);
6abb3655
JH
745 }
746
13f8b72d
NTND
747 strbuf_attach(&sb_msg, msg, strlen(msg), strlen(msg) + 1);
748 create_notes_commit(partial_tree, partial_commit->parents, &sb_msg,
6abb3655 749 result_sha1);
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JN
750 if (o->verbosity >= 4)
751 printf("Finalized notes merge commit: %s\n",
752 sha1_to_hex(result_sha1));
a0be62c1
JH
753 strbuf_release(&path);
754 closedir(dir);
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755 return 0;
756}
757
758int notes_merge_abort(struct notes_merge_options *o)
759{
dabba590
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760 /*
761 * Remove all files within .git/NOTES_MERGE_WORKTREE. We do not remove
762 * the .git/NOTES_MERGE_WORKTREE directory itself, since it might be
763 * the current working directory of the user.
764 */
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765 struct strbuf buf = STRBUF_INIT;
766 int ret;
767
768 strbuf_addstr(&buf, git_path(NOTES_MERGE_WORKTREE));
5f9f8d15 769 if (o->verbosity >= 3)
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770 printf("Removing notes merge worktree at %s/*\n", buf.buf);
771 ret = remove_dir_recursively(&buf, REMOVE_DIR_KEEP_TOPLEVEL);
6abb3655
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772 strbuf_release(&buf);
773 return ret;
774}