summaryrefslogtreecommitdiffstats
path: root/builtin/notes.c
blob: 2987c08a2e920d294f5a443d24381b6021c15fea (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
/*
 * Builtin "git notes"
 *
 * Copyright (c) 2010 Johan Herland <johan@herland.net>
 *
 * Based on git-notes.sh by Johannes Schindelin,
 * and builtin/tag.c by Kristian Høgsberg and Carlos Rica.
 */

#include "cache.h"
#include "config.h"
#include "builtin.h"
#include "notes.h"
#include "object-store.h"
#include "repository.h"
#include "blob.h"
#include "pretty.h"
#include "refs.h"
#include "exec-cmd.h"
#include "run-command.h"
#include "parse-options.h"
#include "string-list.h"
#include "notes-merge.h"
#include "notes-utils.h"
#include "worktree.h"

static const char * const git_notes_usage[] = {
	N_("git notes [--ref <notes-ref>] [list [<object>]]"),
	N_("git notes [--ref <notes-ref>] add [-f] [--allow-empty] [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]"),
	N_("git notes [--ref <notes-ref>] copy [-f] <from-object> <to-object>"),
	N_("git notes [--ref <notes-ref>] append [--allow-empty] [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]"),
	N_("git notes [--ref <notes-ref>] edit [--allow-empty] [<object>]"),
	N_("git notes [--ref <notes-ref>] show [<object>]"),
	N_("git notes [--ref <notes-ref>] merge [-v | -q] [-s <strategy>] <notes-ref>"),
	N_("git notes merge --commit [-v | -q]"),
	N_("git notes merge --abort [-v | -q]"),
	N_("git notes [--ref <notes-ref>] remove [<object>...]"),
	N_("git notes [--ref <notes-ref>] prune [-n] [-v]"),
	N_("git notes [--ref <notes-ref>] get-ref"),
	NULL
};

static const char * const git_notes_list_usage[] = {
	N_("git notes [list [<object>]]"),
	NULL
};

static const char * const git_notes_add_usage[] = {
	N_("git notes add [<options>] [<object>]"),
	NULL
};

static const char * const git_notes_copy_usage[] = {
	N_("git notes copy [<options>] <from-object> <to-object>"),
	N_("git notes copy --stdin [<from-object> <to-object>]..."),
	NULL
};

static const char * const git_notes_append_usage[] = {
	N_("git notes append [<options>] [<object>]"),
	NULL
};

static const char * const git_notes_edit_usage[] = {
	N_("git notes edit [<object>]"),
	NULL
};

static const char * const git_notes_show_usage[] = {
	N_("git notes show [<object>]"),
	NULL
};

static const char * const git_notes_merge_usage[] = {
	N_("git notes merge [<options>] <notes-ref>"),
	N_("git notes merge --commit [<options>]"),
	N_("git notes merge --abort [<options>]"),
	NULL
};

static const char * const git_notes_remove_usage[] = {
	N_("git notes remove [<object>]"),
	NULL
};

static const char * const git_notes_prune_usage[] = {
	N_("git notes prune [<options>]"),
	NULL
};

static const char * const git_notes_get_ref_usage[] = {
	N_("git notes get-ref"),
	NULL
};

static const char note_template[] =
	N_("Write/edit the notes for the following object:");

struct note_data {
	int given;
	int use_editor;
	char *edit_path;
	struct strbuf buf;
};

static void free_note_data(struct note_data *d)
{
	if (d->edit_path) {
		unlink_or_warn(d->edit_path);
		free(d->edit_path);
	}
	strbuf_release(&d->buf);
}

static int list_each_note(const struct object_id *object_oid,
		const struct object_id *note_oid, char *note_path,
		void *cb_data)
{
	printf("%s %s\n", oid_to_hex(note_oid), oid_to_hex(object_oid));
	return 0;
}

static void copy_obj_to_fd(int fd, const struct object_id *oid)
{
	unsigned long size;
	enum object_type type;
	char *buf = read_object_file(oid, &type, &size);
	if (buf) {
		if (size)
			write_or_die(fd, buf, size);
		free(buf);
	}
}

static void write_commented_object(int fd, const struct object_id *object)
{
	const char *show_args[5] =
		{"show", "--stat", "--no-notes", oid_to_hex(object), NULL};
	struct child_process show = CHILD_PROCESS_INIT;
	struct strbuf buf = STRBUF_INIT;
	struct strbuf cbuf = STRBUF_INIT;

	/* Invoke "git show --stat --no-notes $object" */
	show.argv = show_args;
	show.no_stdin = 1;
	show.out = -1;
	show.err = 0;
	show.git_cmd = 1;
	if (start_command(&show))
		die(_("unable to start 'show' for object '%s'"),
		    oid_to_hex(object));

	if (strbuf_read(&buf, show.out, 0) < 0)
		die_errno(_("could not read 'show' output"));
	strbuf_add_commented_lines(&cbuf, buf.buf, buf.len);
	write_or_die(fd, cbuf.buf, cbuf.len);

	strbuf_release(&cbuf);
	strbuf_release(&buf);

	if (finish_command(&show))
		die(_("failed to finish 'show' for object '%s'"),
		    oid_to_hex(object));
}

static void prepare_note_data(const struct object_id *object, struct note_data *d,
		const struct object_id *old_note)
{
	if (d->use_editor || !d->given) {
		int fd;
		struct strbuf buf = STRBUF_INIT;

		/* write the template message before editing: */
		d->edit_path = git_pathdup("NOTES_EDITMSG");
		fd = open(d->edit_path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
		if (fd < 0)
			die_errno(_("could not create file '%s'"), d->edit_path);

		if (d->given)
			write_or_die(fd, d->buf.buf, d->buf.len);
		else if (old_note)
			copy_obj_to_fd(fd, old_note);

		strbuf_addch(&buf, '\n');
		strbuf_add_commented_lines(&buf, "\n", strlen("\n"));
		strbuf_add_commented_lines(&buf, _(note_template), strlen(_(note_template)));
		strbuf_addch(&buf, '\n');
		write_or_die(fd, buf.buf, buf.len);

		write_commented_object(fd, object);

		close(fd);
		strbuf_release(&buf);
		strbuf_reset(&d->buf);

		if (launch_editor(d->edit_path, &d->buf, NULL)) {
			die(_("please supply the note contents using either -m or -F option"));
		}
		strbuf_stripspace(&d->buf, 1);
	}
}

static void write_note_data(struct note_data *d, struct object_id *oid)
{
	if (write_object_file(d->buf.buf, d->buf.len, blob_type, oid)) {
		error(_("unable to write note object"));
		if (d->edit_path)
			error(_("the note contents have been left in %s"),
				d->edit_path);
		exit(128);
	}
}

static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
{
	struct note_data *d = opt->value;

	BUG_ON_OPT_NEG(unset);

	strbuf_grow(&d->buf, strlen(arg) + 2);
	if (d->buf.len)
		strbuf_addch(&d->buf, '\n');
	strbuf_addstr(&d->buf, arg);
	strbuf_stripspace(&d->buf, 0);

	d->given = 1;
	return 0;
}

static int parse_file_arg(const struct option *opt, const char *arg, int unset)
{
	struct note_data *d = opt->value;

	BUG_ON_OPT_NEG(unset);

	if (d->buf.len)
		strbuf_addch(&d->buf, '\n');
	if (!strcmp(arg, "-")) {
		if (strbuf_read(&d->buf, 0, 1024) < 0)
			die_errno(_("cannot read '%s'"), arg);
	} else if (strbuf_read_file(&d->buf, arg, 1024) < 0)
		die_errno(_("could not open or read '%s'"), arg);
	strbuf_stripspace(&d->buf, 0);

	d->given = 1;
	return 0;
}

static int parse_reuse_arg(const struct option *opt, const char *arg, int unset)
{
	struct note_data *d = opt->value;
	char *buf;
	struct object_id object;
	enum object_type type;
	unsigned long len;

	BUG_ON_OPT_NEG(unset);

	if (d->buf.len)
		strbuf_addch(&d->buf, '\n');

	if (get_oid(arg, &object))
		die(_("failed to resolve '%s' as a valid ref."), arg);
	if (!(buf = read_object_file(&object, &type, &len)))
		die(_("failed to read object '%s'."), arg);
	if (type != OBJ_BLOB) {
		free(buf);
		die(_("cannot read note data from non-blob object '%s'."), arg);
	}
	strbuf_add(&d->buf, buf, len);
	free(buf);

	d->given = 1;
	return 0;
}

static int parse_reedit_arg(const struct option *opt, const char *arg, int unset)
{
	struct note_data *d = opt->value;
	BUG_ON_OPT_NEG(unset);
	d->use_editor = 1;
	return parse_reuse_arg(opt, arg, unset);
}

static int notes_copy_from_stdin(int force, const char *rewrite_cmd)
{
	struct strbuf buf = STRBUF_INIT;
	struct notes_rewrite_cfg *c = NULL;
	struct notes_tree *t = NULL;
	int ret = 0;
	const char *msg = "Notes added by 'git notes copy'";

	if (rewrite_cmd) {
		c = init_copy_notes_for_rewrite(rewrite_cmd);
		if (!c)
			return 0;
	} else {
		init_notes(NULL, NULL, NULL, NOTES_INIT_WRITABLE);
		t = &default_notes_tree;
	}

	while (strbuf_getline_lf(&buf, stdin) != EOF) {
		struct object_id from_obj, to_obj;
		struct strbuf **split;
		int err;

		split = strbuf_split(&buf, ' ');
		if (!split[0] || !split[1])
			die(_("malformed input line: '%s'."), buf.buf);
		strbuf_rtrim(split[0]);
		strbuf_rtrim(split[1]);
		if (get_oid(split[0]->buf, &from_obj))
			die(_("failed to resolve '%s' as a valid ref."), split[0]->buf);
		if (get_oid(split[1]->buf, &to_obj))
			die(_("failed to resolve '%s' as a valid ref."), split[1]->buf);

		if (rewrite_cmd)
			err = copy_note_for_rewrite(c, &from_obj, &to_obj);
		else
			err = copy_note(t, &from_obj, &to_obj, force,
					combine_notes_overwrite);

		if (err) {
			error(_("failed to copy notes from '%s' to '%s'"),
			      split[0]->buf, split[1]->buf);
			ret = 1;
		}

		strbuf_list_free(split);
	}

	if (!rewrite_cmd) {
		commit_notes(the_repository, t, msg);
		free_notes(t);
	} else {
		finish_copy_notes_for_rewrite(the_repository, c, msg);
	}
	strbuf_release(&buf);
	return ret;
}

static struct notes_tree *init_notes_check(const char *subcommand,
					   int flags)
{
	struct notes_tree *t;
	const char *ref;
	init_notes(NULL, NULL, NULL, flags);
	t = &default_notes_tree;

	ref = (flags & NOTES_INIT_WRITABLE) ? t->update_ref : t->ref;
	if (!starts_with(ref, "refs/notes/"))
		/*
		 * TRANSLATORS: the first %s will be replaced by a git
		 * notes command: 'add', 'merge', 'remove', etc.
		 */
		die(_("refusing to %s notes in %s (outside of refs/notes/)"),
		    subcommand, ref);
	return t;
}

static int list(int argc, const char **argv, const char *prefix)
{
	struct notes_tree *t;
	struct object_id object;
	const struct object_id *note;
	int retval = -1;
	struct option options[] = {
		OPT_END()
	};

	if (argc)
		argc = parse_options(argc, argv, prefix, options,
				     git_notes_list_usage, 0);

	if (1 < argc) {
		error(_("too many parameters"));
		usage_with_options(git_notes_list_usage, options);
	}

	t = init_notes_check("list", 0);
	if (argc) {
		if (get_oid(argv[0], &object))
			die(_("failed to resolve '%s' as a valid ref."), argv[0]);
		note = get_note(t, &object);
		if (note) {
			puts(oid_to_hex(note));
			retval = 0;
		} else
			retval = error(_("no note found for object %s."),
				       oid_to_hex(&object));
	} else
		retval = for_each_note(t, 0, list_each_note, NULL);

	free_notes(t);
	return retval;
}

static int append_edit(int argc, const char **argv, const char *prefix);

static int add(int argc, const char **argv, const char *prefix)
{
	int force = 0, allow_empty = 0;
	const char *object_ref;
	struct notes_tree *t;
	struct object_id object, new_note;
	const struct object_id *note;
	struct note_data d = { 0, 0, NULL, STRBUF_INIT };
	struct option options[] = {
		OPT_CALLBACK_F('m', "message", &d, N_("message"),
			N_("note contents as a string"), PARSE_OPT_NONEG,
			parse_msg_arg),
		OPT_CALLBACK_F('F', "file", &d, N_("file"),
			N_("note contents in a file"), PARSE_OPT_NONEG,
			parse_file_arg),
		OPT_CALLBACK_F('c', "reedit-message", &d, N_("object"),
			N_("reuse and edit specified note object"), PARSE_OPT_NONEG,
			parse_reedit_arg),
		OPT_CALLBACK_F('C', "reuse-message", &d, N_("object"),
			N_("reuse specified note object"), PARSE_OPT_NONEG,
			parse_reuse_arg),
		OPT_BOOL(0, "allow-empty", &allow_empty,
			N_("allow storing empty note")),
		OPT__FORCE(&force, N_("replace existing notes"), PARSE_OPT_NOCOMPLETE),
		OPT_END()
	};

	argc = parse_options(argc, argv, prefix, options, git_notes_add_usage,
			     PARSE_OPT_KEEP_ARGV0);

	if (2 < argc) {
		error(_("too many parameters"));
		usage_with_options(git_notes_add_usage, options);
	}

	object_ref = argc > 1 ? argv[1] : "HEAD";

	if (get_oid(object_ref, &object))
		die(_("failed to resolve '%s' as a valid ref."), object_ref);

	t = init_notes_check("add", NOTES_INIT_WRITABLE);
	note = get_note(t, &object);

	if (note) {
		if (!force) {
			free_notes(t);
			if (d.given) {
				free_note_data(&d);
				return error(_("Cannot add notes. "
					"Found existing notes for object %s. "
					"Use '-f' to overwrite existing notes"),
					oid_to_hex(&object));
			}
			/*
			 * Redirect to "edit" subcommand.
			 *
			 * We only end up here if none of -m/-F/-c/-C or -f are
			 * given. The original args are therefore still in
			 * argv[0-1].
			 */
			argv[0] = "edit";
			return append_edit(argc, argv, prefix);
		}
		fprintf(stderr, _("Overwriting existing notes for object %s\n"),
			oid_to_hex(&object));
	}

	prepare_note_data(&object, &d, note);
	if (d.buf.len || allow_empty) {
		write_note_data(&d, &new_note);
		if (add_note(t, &object, &new_note, combine_notes_overwrite))
			BUG("combine_notes_overwrite failed");
		commit_notes(the_repository, t,
			     "Notes added by 'git notes add'");
	} else {
		fprintf(stderr, _("Removing note for object %s\n"),
			oid_to_hex(&object));
		remove_note(t, object.hash);
		commit_notes(the_repository, t,
			     "Notes removed by 'git notes add'");
	}

	free_note_data(&d);
	free_notes(t);
	return 0;
}

static int copy(int argc, const char **argv, const char *prefix)
{
	int retval = 0, force = 0, from_stdin = 0;
	const struct object_id *from_note, *note;
	const char *object_ref;
	struct object_id object, from_obj;
	struct notes_tree *t;
	const char *rewrite_cmd = NULL;
	struct option options[] = {
		OPT__FORCE(&force, N_("replace existing notes"), PARSE_OPT_NOCOMPLETE),
		OPT_BOOL(0, "stdin", &from_stdin, N_("read objects from stdin")),
		OPT_STRING(0, "for-rewrite", &rewrite_cmd, N_("command"),
			   N_("load rewriting config for <command> (implies "
			      "--stdin)")),
		OPT_END()
	};

	argc = parse_options(argc, argv, prefix, options, git_notes_copy_usage,
			     0);

	if (from_stdin || rewrite_cmd) {
		if (argc) {
			error(_("too many parameters"));
			usage_with_options(git_notes_copy_usage, options);
		} else {
			return notes_copy_from_stdin(force, rewrite_cmd);
		}
	}

	if (argc < 1) {
		error(_("too few parameters"));
		usage_with_options(git_notes_copy_usage, options);
	}
	if (2 < argc) {
		error(_("too many parameters"));
		usage_with_options(git_notes_copy_usage, options);
	}

	if (get_oid(argv[0], &from_obj))
		die(_("failed to resolve '%s' as a valid ref."), argv[0]);

	object_ref = 1 < argc ? argv[1] : "HEAD";

	if (get_oid(object_ref, &object))
		die(_("failed to resolve '%s' as a valid ref."), object_ref);

	t = init_notes_check("copy", NOTES_INIT_WRITABLE);
	note = get_note(t, &object);

	if (note) {
		if (!force) {
			retval = error(_("Cannot copy notes. Found existing "
				       "notes for object %s. Use '-f' to "
				       "overwrite existing notes"),
				       oid_to_hex(&object));
			goto out;
		}
		fprintf(stderr, _("Overwriting existing notes for object %s\n"),
			oid_to_hex(&object));
	}

	from_note = get_note(t, &from_obj);
	if (!from_note) {
		retval = error(_("missing notes on source object %s. Cannot "
			       "copy."), oid_to_hex(&from_obj));
		goto out;
	}

	if (add_note(t, &object, from_note, combine_notes_overwrite))
		BUG("combine_notes_overwrite failed");
	commit_notes(the_repository, t,
		     "Notes added by 'git notes copy'");
out:
	free_notes(t);
	return retval;
}

static int append_edit(int argc, const char **argv, const char *prefix)
{
	int allow_empty = 0;
	const char *object_ref;
	struct notes_tree *t;
	struct object_id object, new_note;
	const struct object_id *note;
	char *logmsg;
	const char * const *usage;
	struct note_data d = { 0, 0, NULL, STRBUF_INIT };
	struct option options[] = {
		OPT_CALLBACK_F('m', "message", &d, N_("message"),
			N_("note contents as a string"), PARSE_OPT_NONEG,
			parse_msg_arg),
		OPT_CALLBACK_F('F', "file", &d, N_("file"),
			N_("note contents in a file"), PARSE_OPT_NONEG,
			parse_file_arg),
		OPT_CALLBACK_F('c', "reedit-message", &d, N_("object"),
			N_("reuse and edit specified note object"), PARSE_OPT_NONEG,
			parse_reedit_arg),
		OPT_CALLBACK_F('C', "reuse-message", &d, N_("object"),
			N_("reuse specified note object"), PARSE_OPT_NONEG,
			parse_reuse_arg),
		OPT_BOOL(0, "allow-empty", &allow_empty,
			N_("allow storing empty note")),
		OPT_END()
	};
	int edit = !strcmp(argv[0], "edit");

	usage = edit ? git_notes_edit_usage : git_notes_append_usage;
	argc = parse_options(argc, argv, prefix, options, usage,
			     PARSE_OPT_KEEP_ARGV0);

	if (2 < argc) {
		error(_("too many parameters"));
		usage_with_options(usage, options);
	}

	if (d.given && edit)
		fprintf(stderr, _("The -m/-F/-c/-C options have been deprecated "
			"for the 'edit' subcommand.\n"
			"Please use 'git notes add -f -m/-F/-c/-C' instead.\n"));

	object_ref = 1 < argc ? argv[1] : "HEAD";

	if (get_oid(object_ref, &object))
		die(_("failed to resolve '%s' as a valid ref."), object_ref);

	t = init_notes_check(argv[0], NOTES_INIT_WRITABLE);
	note = get_note(t, &object);

	prepare_note_data(&object, &d, edit && note ? note : NULL);

	if (note && !edit) {
		/* Append buf to previous note contents */
		unsigned long size;
		enum object_type type;
		char *prev_buf = read_object_file(note, &type, &size);

		strbuf_grow(&d.buf, size + 1);
		if (d.buf.len && prev_buf && size)
			strbuf_insertstr(&d.buf, 0, "\n");
		if (prev_buf && size)
			strbuf_insert(&d.buf, 0, prev_buf, size);
		free(prev_buf);
	}

	if (d.buf.len || allow_empty) {
		write_note_data(&d, &new_note);
		if (add_note(t, &object, &new_note, combine_notes_overwrite))
			BUG("combine_notes_overwrite failed");
		logmsg = xstrfmt("Notes added by 'git notes %s'", argv[0]);
	} else {
		fprintf(stderr, _("Removing note for object %s\n"),
			oid_to_hex(&object));
		remove_note(t, object.hash);
		logmsg = xstrfmt("Notes removed by 'git notes %s'", argv[0]);
	}
	commit_notes(the_repository, t, logmsg);

	free(logmsg);
	free_note_data(&d);
	free_notes(t);
	return 0;
}

static int show(int argc, const char **argv, const char *prefix)
{
	const char *object_ref;
	struct notes_tree *t;
	struct object_id object;
	const struct object_id *note;
	int retval;
	struct option options[] = {
		OPT_END()
	};

	argc = parse_options(argc, argv, prefix, options, git_notes_show_usage,
			     0);

	if (1 < argc) {
		error(_("too many parameters"));
		usage_with_options(git_notes_show_usage, options);
	}

	object_ref = argc ? argv[0] : "HEAD";

	if (get_oid(object_ref, &object))
		die(_("failed to resolve '%s' as a valid ref."), object_ref);

	t = init_notes_check("show", 0);
	note = get_note(t, &object);

	if (!note)
		retval = error(_("no note found for object %s."),
			       oid_to_hex(&object));
	else {
		const char *show_args[3] = {"show", oid_to_hex(note), NULL};
		retval = execv_git_cmd(show_args);
	}
	free_notes(t);
	return retval;
}

static int merge_abort(struct notes_merge_options *o)
{
	int ret = 0;

	/*
	 * Remove .git/NOTES_MERGE_PARTIAL and .git/NOTES_MERGE_REF, and call
	 * notes_merge_abort() to remove .git/NOTES_MERGE_WORKTREE.
	 */

	if (delete_ref(NULL, "NOTES_MERGE_PARTIAL", NULL, 0))
		ret += error(_("failed to delete ref NOTES_MERGE_PARTIAL"));
	if (delete_ref(NULL, "NOTES_MERGE_REF", NULL, REF_NO_DEREF))
		ret += error(_("failed to delete ref NOTES_MERGE_REF"));
	if (notes_merge_abort(o))
		ret += error(_("failed to remove 'git notes merge' worktree"));
	return ret;
}

static int merge_commit(struct notes_merge_options *o)
{
	struct strbuf msg = STRBUF_INIT;
	struct object_id oid, parent_oid;
	struct notes_tree *t;
	struct commit *partial;
	struct pretty_print_context pretty_ctx;
	void *local_ref_to_free;
	int ret;

	/*
	 * Read partial merge result from .git/NOTES_MERGE_PARTIAL,
	 * and target notes ref from .git/NOTES_MERGE_REF.
	 */

	if (get_oid("NOTES_MERGE_PARTIAL", &oid))
		die(_("failed to read ref NOTES_MERGE_PARTIAL"));
	else if (!(partial = lookup_commit_reference(the_repository, &oid)))
		die(_("could not find commit from NOTES_MERGE_PARTIAL."));
	else if (parse_commit(partial))
		die(_("could not parse commit from NOTES_MERGE_PARTIAL."));

	if (partial->parents)
		oidcpy(&parent_oid, &partial->parents->item->object.oid);
	else
		oidclr(&parent_oid);

	t = xcalloc(1, sizeof(struct notes_tree));
	init_notes(t, "NOTES_MERGE_PARTIAL", combine_notes_overwrite, 0);

	o->local_ref = local_ref_to_free =
		resolve_refdup("NOTES_MERGE_REF", 0, &oid, NULL);
	if (!o->local_ref)
		die(_("failed to resolve NOTES_MERGE_REF"));

	if (notes_merge_commit(o, t, partial, &oid))
		die(_("failed to finalize notes merge"));

	/* Reuse existing commit message in reflog message */
	memset(&pretty_ctx, 0, sizeof(pretty_ctx));
	format_commit_message(partial, "%s", &msg, &pretty_ctx);
	strbuf_trim(&msg);
	strbuf_insertstr(&msg, 0, "notes: ");
	update_ref(msg.buf, o->local_ref, &oid,
		   is_null_oid(&parent_oid) ? NULL : &parent_oid,
		   0, UPDATE_REFS_DIE_ON_ERR);

	free_notes(t);
	strbuf_release(&msg);
	ret = merge_abort(o);
	free(local_ref_to_free);
	return ret;
}

static int git_config_get_notes_strategy(const char *key,
					 enum notes_merge_strategy *strategy)
{
	char *value;

	if (git_config_get_string(key, &value))
		return 1;
	if (parse_notes_merge_strategy(value, strategy))
		git_die_config(key, _("unknown notes merge strategy %s"), value);

	free(value);
	return 0;
}

static int merge(int argc, const char **argv, const char *prefix)
{
	struct strbuf remote_ref = STRBUF_INIT, msg = STRBUF_INIT;
	struct object_id result_oid;
	struct notes_tree *t;
	struct notes_merge_options o;
	int do_merge = 0, do_commit = 0, do_abort = 0;
	int verbosity = 0, result;
	const char *strategy = NULL;
	struct option options[] = {
		OPT_GROUP(N_("General options")),
		OPT__VERBOSITY(&verbosity),
		OPT_GROUP(N_("Merge options")),
		OPT_STRING('s', "strategy", &strategy, N_("strategy"),
			   N_("resolve notes conflicts using the given strategy "
			      "(manual/ours/theirs/union/cat_sort_uniq)")),
		OPT_GROUP(N_("Committing unmerged notes")),
		OPT_SET_INT_F(0, "commit", &do_commit,
			      N_("finalize notes merge by committing unmerged notes"),
			      1, PARSE_OPT_NONEG),
		OPT_GROUP(N_("Aborting notes merge resolution")),
		OPT_SET_INT_F(0, "abort", &do_abort,
			      N_("abort notes merge"),
			      1, PARSE_OPT_NONEG),
		OPT_END()
	};

	argc = parse_options(argc, argv, prefix, options,
			     git_notes_merge_usage, 0);

	if (strategy || do_commit + do_abort == 0)
		do_merge = 1;
	if (do_merge + do_commit + do_abort != 1) {
		error(_("cannot mix --commit, --abort or -s/--strategy"));
		usage_with_options(git_notes_merge_usage, options);
	}

	if (do_merge && argc != 1) {
		error(_("must specify a notes ref to merge"));
		usage_with_options(git_notes_merge_usage, options);
	} else if (!do_merge && argc) {
		error(_("too many parameters"));
		usage_with_options(git_notes_merge_usage, options);
	}

	init_notes_merge_options(the_repository, &o);
	o.verbosity = verbosity + NOTES_MERGE_VERBOSITY_DEFAULT;

	if (do_abort)
		return merge_abort(&o);
	if (do_commit)
		return merge_commit(&o);

	o.local_ref = default_notes_ref();
	strbuf_addstr(&remote_ref, argv[0]);
	expand_loose_notes_ref(&remote_ref);
	o.remote_ref = remote_ref.buf;

	t = init_notes_check("merge", NOTES_INIT_WRITABLE);

	if (strategy) {
		if (parse_notes_merge_strategy(strategy, &o.strategy)) {
			error(_("unknown -s/--strategy: %s"), strategy);
			usage_with_options(git_notes_merge_usage, options);
		}
	} else {
		struct strbuf merge_key = STRBUF_INIT;
		const char *short_ref = NULL;

		if (!skip_prefix(o.local_ref, "refs/notes/", &short_ref))
			BUG("local ref %s is outside of refs/notes/",
			    o.local_ref);

		strbuf_addf(&merge_key, "notes.%s.mergeStrategy", short_ref);

		if (git_config_get_notes_strategy(merge_key.buf, &o.strategy))
			git_config_get_notes_strategy("notes.mergeStrategy", &o.strategy);

		strbuf_release(&merge_key);
	}

	strbuf_addf(&msg, "notes: Merged notes from %s into %s",
		    remote_ref.buf, default_notes_ref());
	strbuf_add(&(o.commit_msg), msg.buf + 7, msg.len - 7); /* skip "notes: " */

	result = notes_merge(&o, t, &result_oid);

	if (result >= 0) /* Merge resulted (trivially) in result_oid */
		/* Update default notes ref with new commit */
		update_ref(msg.buf, default_notes_ref(), &result_oid, NULL, 0,
			   UPDATE_REFS_DIE_ON_ERR);
	else { /* Merge has unresolved conflicts */
		const struct worktree *wt;
		/* Update .git/NOTES_MERGE_PARTIAL with partial merge result */
		update_ref(msg.buf, "NOTES_MERGE_PARTIAL", &result_oid, NULL,
			   0, UPDATE_REFS_DIE_ON_ERR);
		/* Store ref-to-be-updated into .git/NOTES_MERGE_REF */
		wt = find_shared_symref("NOTES_MERGE_REF", default_notes_ref());
		if (wt)
			die(_("a notes merge into %s is already in-progress at %s"),
			    default_notes_ref(), wt->path);
		if (create_symref("NOTES_MERGE_REF", default_notes_ref(), NULL))
			die(_("failed to store link to current notes ref (%s)"),
			    default_notes_ref());
		fprintf(stderr, _("Automatic notes merge failed. Fix conflicts in %s "
				  "and commit the result with 'git notes merge --commit', "
				  "or abort the merge with 'git notes merge --abort'.\n"),
			git_path(NOTES_MERGE_WORKTREE));
	}

	free_notes(t);
	strbuf_release(&remote_ref);
	strbuf_release(&msg);
	return result < 0; /* return non-zero on conflicts */
}

#define IGNORE_MISSING 1

static int remove_one_note(struct notes_tree *t, const char *name, unsigned flag)
{
	int status;
	struct object_id oid;
	if (get_oid(name, &oid))
		return error(_("Failed to resolve '%s' as a valid ref."), name);
	status = remove_note(t, oid.hash);
	if (status)
		fprintf(stderr, _("Object %s has no note\n"), name);
	else
		fprintf(stderr, _("Removing note for object %s\n"), name);
	return (flag & IGNORE_MISSING) ? 0 : status;
}

static int remove_cmd(int argc, const char **argv, const char *prefix)
{
	unsigned flag = 0;
	int from_stdin = 0;
	struct option options[] = {
		OPT_BIT(0, "ignore-missing", &flag,
			N_("attempt to remove non-existent note is not an error"),
			IGNORE_MISSING),
		OPT_BOOL(0, "stdin", &from_stdin,
			    N_("read object names from the standard input")),
		OPT_END()
	};
	struct notes_tree *t;
	int retval = 0;

	argc = parse_options(argc, argv, prefix, options,
			     git_notes_remove_usage, 0);

	t = init_notes_check("remove", NOTES_INIT_WRITABLE);

	if (!argc && !from_stdin) {
		retval = remove_one_note(t, "HEAD", flag);
	} else {
		while (*argv) {
			retval |= remove_one_note(t, *argv, flag);
			argv++;
		}
	}
	if (from_stdin) {
		struct strbuf sb = STRBUF_INIT;
		while (strbuf_getwholeline(&sb, stdin, '\n') != EOF) {
			strbuf_rtrim(&sb);
			retval |= remove_one_note(t, sb.buf, flag);
		}
		strbuf_release(&sb);
	}
	if (!retval)
		commit_notes(the_repository, t,
			     "Notes removed by 'git notes remove'");
	free_notes(t);
	return retval;
}

static int prune(int argc, const char **argv, const char *prefix)
{
	struct notes_tree *t;
	int show_only = 0, verbose = 0;
	struct option options[] = {
		OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
		OPT__VERBOSE(&verbose, N_("report pruned notes")),
		OPT_END()
	};

	argc = parse_options(argc, argv, prefix, options, git_notes_prune_usage,
			     0);

	if (argc) {
		error(_("too many parameters"));
		usage_with_options(git_notes_prune_usage, options);
	}

	t = init_notes_check("prune", NOTES_INIT_WRITABLE);

	prune_notes(t, (verbose ? NOTES_PRUNE_VERBOSE : 0) |
		(show_only ? NOTES_PRUNE_VERBOSE|NOTES_PRUNE_DRYRUN : 0) );
	if (!show_only)
		commit_notes(the_repository, t,
			     "Notes removed by 'git notes prune'");
	free_notes(t);
	return 0;
}

static int get_ref(int argc, const char **argv, const char *prefix)
{
	struct option options[] = { OPT_END() };
	argc = parse_options(argc, argv, prefix, options,
			     git_notes_get_ref_usage, 0);

	if (argc) {
		error(_("too many parameters"));
		usage_with_options(git_notes_get_ref_usage, options);
	}

	puts(default_notes_ref());
	return 0;
}

int cmd_notes(int argc, const char **argv, const char *prefix)
{
	int result;
	const char *override_notes_ref = NULL;
	struct option options[] = {
		OPT_STRING(0, "ref", &override_notes_ref, N_("notes-ref"),
			   N_("use notes from <notes-ref>")),
		OPT_END()
	};

	git_config(git_default_config, NULL);
	argc = parse_options(argc, argv, prefix, options, git_notes_usage,
			     PARSE_OPT_STOP_AT_NON_OPTION);

	if (override_notes_ref) {
		struct strbuf sb = STRBUF_INIT;
		strbuf_addstr(&sb, override_notes_ref);
		expand_notes_ref(&sb);
		setenv("GIT_NOTES_REF", sb.buf, 1);
		strbuf_release(&sb);
	}

	if (argc < 1 || !strcmp(argv[0], "list"))
		result = list(argc, argv, prefix);
	else if (!strcmp(argv[0], "add"))
		result = add(argc, argv, prefix);
	else if (!strcmp(argv[0], "copy"))
		result = copy(argc, argv, prefix);
	else if (!strcmp(argv[0], "append") || !strcmp(argv[0], "edit"))
		result = append_edit(argc, argv, prefix);
	else if (!strcmp(argv[0], "show"))
		result = show(argc, argv, prefix);
	else if (!strcmp(argv[0], "merge"))
		result = merge(argc, argv, prefix);
	else if (!strcmp(argv[0], "remove"))
		result = remove_cmd(argc, argv, prefix);
	else if (!strcmp(argv[0], "prune"))
		result = prune(argc, argv, prefix);
	else if (!strcmp(argv[0], "get-ref"))
		result = get_ref(argc, argv, prefix);
	else {
		result = error(_("unknown subcommand: %s"), argv[0]);
		usage_with_options(git_notes_usage, options);
	}

	return result ? 1 : 0;
}