summaryrefslogtreecommitdiff
path: root/builtin/notes.c
blob: 32d8a249446d2b1dfa2105cce9900291a72fc643 (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
/*
 * 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 "builtin.h"
#include "notes.h"
#include "blob.h"
#include "commit.h"
#include "refs.h"
#include "exec_cmd.h"
#include "run-command.h"
#include "parse-options.h"
#include "string-list.h"
#include "notes-merge.h"
 
static const char * const git_notes_usage[] = {
	"git notes [--ref <notes_ref>] [list [<object>]]",
	"git notes [--ref <notes_ref>] add [-f] [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]",
	"git notes [--ref <notes_ref>] copy [-f] <from-object> <to-object>",
	"git notes [--ref <notes_ref>] append [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]",
	"git notes [--ref <notes_ref>] edit [<object>]",
	"git notes [--ref <notes_ref>] show [<object>]",
	"git notes [--ref <notes_ref>] merge [-v | -q] <notes_ref>",
	"git notes [--ref <notes_ref>] remove [<object>]",
	"git notes [--ref <notes_ref>] prune [-n | -v]",
	NULL
};
 
static const char * const git_notes_list_usage[] = {
	"git notes [list [<object>]]",
	NULL
};
 
static const char * const git_notes_add_usage[] = {
	"git notes add [<options>] [<object>]",
	NULL
};
 
static const char * const git_notes_copy_usage[] = {
	"git notes copy [<options>] <from-object> <to-object>",
	"git notes copy --stdin [<from-object> <to-object>]...",
	NULL
};
 
static const char * const git_notes_append_usage[] = {
	"git notes append [<options>] [<object>]",
	NULL
};
 
static const char * const git_notes_edit_usage[] = {
	"git notes edit [<object>]",
	NULL
};
 
static const char * const git_notes_show_usage[] = {
	"git notes show [<object>]",
	NULL
};
 
static const char * const git_notes_merge_usage[] = {
	"git notes merge [<options>] <notes_ref>",
	NULL
};
 
static const char * const git_notes_remove_usage[] = {
	"git notes remove [<object>]",
	NULL
};
 
static const char * const git_notes_prune_usage[] = {
	"git notes prune [<options>]",
	NULL
};
 
static const char note_template[] =
	"\n"
	"#\n"
	"# Write/edit the notes for the following object:\n"
	"#\n";
 
struct msg_arg {
	int given;
	int use_editor;
	struct strbuf buf;
};
 
static void expand_notes_ref(struct strbuf *sb)
{
	if (!prefixcmp(sb->buf, "refs/notes/"))
		return; /* we're happy */
	else if (!prefixcmp(sb->buf, "notes/"))
		strbuf_insert(sb, 0, "refs/", 5);
	else
		strbuf_insert(sb, 0, "refs/notes/", 11);
}
 
static int list_each_note(const unsigned char *object_sha1,
		const unsigned char *note_sha1, char *note_path,
		void *cb_data)
{
	printf("%s %s\n", sha1_to_hex(note_sha1), sha1_to_hex(object_sha1));
	return 0;
}
 
static void write_note_data(int fd, const unsigned char *sha1)
{
	unsigned long size;
	enum object_type type;
	char *buf = read_sha1_file(sha1, &type, &size);
	if (buf) {
		if (size)
			write_or_die(fd, buf, size);
		free(buf);
	}
}
 
static void write_commented_object(int fd, const unsigned char *object)
{
	const char *show_args[5] =
		{"show", "--stat", "--no-notes", sha1_to_hex(object), NULL};
	struct child_process show;
	struct strbuf buf = STRBUF_INIT;
	FILE *show_out;
 
	/* Invoke "git show --stat --no-notes $object" */
	memset(&show, 0, sizeof(show));
	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'",
		    sha1_to_hex(object));
 
	/* Open the output as FILE* so strbuf_getline() can be used. */
	show_out = xfdopen(show.out, "r");
	if (show_out == NULL)
		die_errno("can't fdopen 'show' output fd");
 
	/* Prepend "# " to each output line and write result to 'fd' */
	while (strbuf_getline(&buf, show_out, '\n') != EOF) {
		write_or_die(fd, "# ", 2);
		write_or_die(fd, buf.buf, buf.len);
		write_or_die(fd, "\n", 1);
	}
	strbuf_release(&buf);
	if (fclose(show_out))
		die_errno("failed to close pipe to 'show' for object '%s'",
			  sha1_to_hex(object));
	if (finish_command(&show))
		die("failed to finish 'show' for object '%s'",
		    sha1_to_hex(object));
}
 
static void create_note(const unsigned char *object, struct msg_arg *msg,
			int append_only, const unsigned char *prev,
			unsigned char *result)
{
	char *path = NULL;
 
	if (msg->use_editor || !msg->given) {
		int fd;
 
		/* write the template message before editing: */
		path = git_pathdup("NOTES_EDITMSG");
		fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
		if (fd < 0)
			die_errno("could not create file '%s'", path);
 
		if (msg->given)
			write_or_die(fd, msg->buf.buf, msg->buf.len);
		else if (prev && !append_only)
			write_note_data(fd, prev);
		write_or_die(fd, note_template, strlen(note_template));
 
		write_commented_object(fd, object);
 
		close(fd);
		strbuf_reset(&(msg->buf));
 
		if (launch_editor(path, &(msg->buf), NULL)) {
			die("Please supply the note contents using either -m" \
			    " or -F option");
		}
		stripspace(&(msg->buf), 1);
	}
 
	if (prev && append_only) {
		/* Append buf to previous note contents */
		unsigned long size;
		enum object_type type;
		char *prev_buf = read_sha1_file(prev, &type, &size);
 
		strbuf_grow(&(msg->buf), size + 1);
		if (msg->buf.len && prev_buf && size)
			strbuf_insert(&(msg->buf), 0, "\n", 1);
		if (prev_buf && size)
			strbuf_insert(&(msg->buf), 0, prev_buf, size);
		free(prev_buf);
	}
 
	if (!msg->buf.len) {
		fprintf(stderr, "Removing note for object %s\n",
			sha1_to_hex(object));
		hashclr(result);
	} else {
		if (write_sha1_file(msg->buf.buf, msg->buf.len, blob_type, result)) {
			error("unable to write note object");
			if (path)
				error("The note contents has been left in %s",
				      path);
			exit(128);
		}
	}
 
	if (path) {
		unlink_or_warn(path);
		free(path);
	}
}
 
static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
{
	struct msg_arg *msg = opt->value;
 
	strbuf_grow(&(msg->buf), strlen(arg) + 2);
	if (msg->buf.len)
		strbuf_addch(&(msg->buf), '\n');
	strbuf_addstr(&(msg->buf), arg);
	stripspace(&(msg->buf), 0);
 
	msg->given = 1;
	return 0;
}
 
static int parse_file_arg(const struct option *opt, const char *arg, int unset)
{
	struct msg_arg *msg = opt->value;
 
	if (msg->buf.len)
		strbuf_addch(&(msg->buf), '\n');
	if (!strcmp(arg, "-")) {
		if (strbuf_read(&(msg->buf), 0, 1024) < 0)
			die_errno("cannot read '%s'", arg);
	} else if (strbuf_read_file(&(msg->buf), arg, 1024) < 0)
		die_errno("could not open or read '%s'", arg);
	stripspace(&(msg->buf), 0);
 
	msg->given = 1;
	return 0;
}
 
static int parse_reuse_arg(const struct option *opt, const char *arg, int unset)
{
	struct msg_arg *msg = opt->value;
	char *buf;
	unsigned char object[20];
	enum object_type type;
	unsigned long len;
 
	if (msg->buf.len)
		strbuf_addch(&(msg->buf), '\n');
 
	if (get_sha1(arg, object))
		die("Failed to resolve '%s' as a valid ref.", arg);
	if (!(buf = read_sha1_file(object, &type, &len)) || !len) {
		free(buf);
		die("Failed to read object '%s'.", arg);;
	}
	strbuf_add(&(msg->buf), buf, len);
	free(buf);
 
	msg->given = 1;
	return 0;
}
 
static int parse_reedit_arg(const struct option *opt, const char *arg, int unset)
{
	struct msg_arg *msg = opt->value;
	msg->use_editor = 1;
	return parse_reuse_arg(opt, arg, unset);
}
 
void commit_notes(struct notes_tree *t, const char *msg)
{
	struct strbuf buf = STRBUF_INIT;
	unsigned char commit_sha1[20];
 
	if (!t)
		t = &default_notes_tree;
	if (!t->initialized || !t->ref || !*t->ref)
		die("Cannot commit uninitialized/unreferenced notes tree");
	if (!t->dirty)
		return; /* don't have to commit an unchanged tree */
 
	/* Prepare commit message and reflog message */
	strbuf_addstr(&buf, "notes: "); /* commit message starts at index 7 */
	strbuf_addstr(&buf, msg);
	if (buf.buf[buf.len - 1] != '\n')
		strbuf_addch(&buf, '\n'); /* Make sure msg ends with newline */
 
	create_notes_commit(t, NULL, buf.buf + 7, commit_sha1);
	update_ref(buf.buf, t->ref, commit_sha1, NULL, 0, DIE_ON_ERR);
 
	strbuf_release(&buf);
}
 
combine_notes_fn parse_combine_notes_fn(const char *v)
{
	if (!strcasecmp(v, "overwrite"))
		return combine_notes_overwrite;
	else if (!strcasecmp(v, "ignore"))
		return combine_notes_ignore;
	else if (!strcasecmp(v, "concatenate"))
		return combine_notes_concatenate;
	else
		return NULL;
}
 
static int notes_rewrite_config(const char *k, const char *v, void *cb)
{
	struct notes_rewrite_cfg *c = cb;
	if (!prefixcmp(k, "notes.rewrite.") && !strcmp(k+14, c->cmd)) {
		c->enabled = git_config_bool(k, v);
		return 0;
	} else if (!c->mode_from_env && !strcmp(k, "notes.rewritemode")) {
		if (!v)
			config_error_nonbool(k);
		c->combine = parse_combine_notes_fn(v);
		if (!c->combine) {
			error("Bad notes.rewriteMode value: '%s'", v);
			return 1;
		}
		return 0;
	} else if (!c->refs_from_env && !strcmp(k, "notes.rewriteref")) {
		/* note that a refs/ prefix is implied in the
		 * underlying for_each_glob_ref */
		if (!prefixcmp(v, "refs/notes/"))
			string_list_add_refs_by_glob(c->refs, v);
		else
			warning("Refusing to rewrite notes in %s"
				" (outside of refs/notes/)", v);
		return 0;
	}
 
	return 0;
}
 
 
struct notes_rewrite_cfg *init_copy_notes_for_rewrite(const char *cmd)
{
	struct notes_rewrite_cfg *c = xmalloc(sizeof(struct notes_rewrite_cfg));
	const char *rewrite_mode_env = getenv(GIT_NOTES_REWRITE_MODE_ENVIRONMENT);
	const char *rewrite_refs_env = getenv(GIT_NOTES_REWRITE_REF_ENVIRONMENT);
	c->cmd = cmd;
	c->enabled = 1;
	c->combine = combine_notes_concatenate;
	c->refs = xcalloc(1, sizeof(struct string_list));
	c->refs->strdup_strings = 1;
	c->refs_from_env = 0;
	c->mode_from_env = 0;
	if (rewrite_mode_env) {
		c->mode_from_env = 1;
		c->combine = parse_combine_notes_fn(rewrite_mode_env);
		if (!c->combine)
			error("Bad " GIT_NOTES_REWRITE_MODE_ENVIRONMENT
			      " value: '%s'", rewrite_mode_env);
	}
	if (rewrite_refs_env) {
		c->refs_from_env = 1;
		string_list_add_refs_from_colon_sep(c->refs, rewrite_refs_env);
	}
	git_config(notes_rewrite_config, c);
	if (!c->enabled || !c->refs->nr) {
		string_list_clear(c->refs, 0);
		free(c->refs);
		free(c);
		return NULL;
	}
	c->trees = load_notes_trees(c->refs);
	string_list_clear(c->refs, 0);
	free(c->refs);
	return c;
}
 
int copy_note_for_rewrite(struct notes_rewrite_cfg *c,
			  const unsigned char *from_obj, const unsigned char *to_obj)
{
	int ret = 0;
	int i;
	for (i = 0; c->trees[i]; i++)
		ret = copy_note(c->trees[i], from_obj, to_obj, 1, c->combine) || ret;
	return ret;
}
 
void finish_copy_notes_for_rewrite(struct notes_rewrite_cfg *c)
{
	int i;
	for (i = 0; c->trees[i]; i++) {
		commit_notes(c->trees[i], "Notes added by 'git notes copy'");
		free_notes(c->trees[i]);
	}
	free(c->trees);
	free(c);
}
 
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;
 
	if (rewrite_cmd) {
		c = init_copy_notes_for_rewrite(rewrite_cmd);
		if (!c)
			return 0;
	} else {
		init_notes(NULL, NULL, NULL, 0);
		t = &default_notes_tree;
	}
 
	while (strbuf_getline(&buf, stdin, '\n') != EOF) {
		unsigned char from_obj[20], to_obj[20];
		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_sha1(split[0]->buf, from_obj))
			die("Failed to resolve '%s' as a valid ref.", split[0]->buf);
		if (get_sha1(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(t, "Notes added by 'git notes copy'");
		free_notes(t);
	} else {
		finish_copy_notes_for_rewrite(c);
	}
	return ret;
}
 
static struct notes_tree *init_notes_check(const char *subcommand)
{
	struct notes_tree *t;
	init_notes(NULL, NULL, NULL, 0);
	t = &default_notes_tree;
 
	if (prefixcmp(t->ref, "refs/notes/"))
		die("Refusing to %s notes in %s (outside of refs/notes/)",
		    subcommand, t->ref);
	return t;
}
 
static int list(int argc, const char **argv, const char *prefix)
{
	struct notes_tree *t;
	unsigned char object[20];
	const unsigned char *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");
	if (argc) {
		if (get_sha1(argv[0], object))
			die("Failed to resolve '%s' as a valid ref.", argv[0]);
		note = get_note(t, object);
		if (note) {
			puts(sha1_to_hex(note));
			retval = 0;
		} else
			retval = error("No note found for object %s.",
				       sha1_to_hex(object));
	} else
		retval = for_each_note(t, 0, list_each_note, NULL);
 
	free_notes(t);
	return retval;
}
 
static int add(int argc, const char **argv, const char *prefix)
{
	int retval = 0, force = 0;
	const char *object_ref;
	struct notes_tree *t;
	unsigned char object[20], new_note[20];
	char logmsg[100];
	const unsigned char *note;
	struct msg_arg msg = { 0, 0, STRBUF_INIT };
	struct option options[] = {
		{ OPTION_CALLBACK, 'm', "message", &msg, "MSG",
			"note contents as a string", PARSE_OPT_NONEG,
			parse_msg_arg},
		{ OPTION_CALLBACK, 'F', "file", &msg, "FILE",
			"note contents in a file", PARSE_OPT_NONEG,
			parse_file_arg},
		{ OPTION_CALLBACK, 'c', "reedit-message", &msg, "OBJECT",
			"reuse and edit specified note object", PARSE_OPT_NONEG,
			parse_reedit_arg},
		{ OPTION_CALLBACK, 'C', "reuse-message", &msg, "OBJECT",
			"reuse specified note object", PARSE_OPT_NONEG,
			parse_reuse_arg},
		OPT_BOOLEAN('f', "force", &force, "replace existing notes"),
		OPT_END()
	};
 
	argc = parse_options(argc, argv, prefix, options, git_notes_add_usage,
			     0);
 
	if (1 < argc) {
		error("too many parameters");
		usage_with_options(git_notes_add_usage, options);
	}
 
	object_ref = argc ? argv[0] : "HEAD";
 
	if (get_sha1(object_ref, object))
		die("Failed to resolve '%s' as a valid ref.", object_ref);
 
	t = init_notes_check("add");
	note = get_note(t, object);
 
	if (note) {
		if (!force) {
			retval = error("Cannot add notes. Found existing notes "
				       "for object %s. Use '-f' to overwrite "
				       "existing notes", sha1_to_hex(object));
			goto out;
		}
		fprintf(stderr, "Overwriting existing notes for object %s\n",
			sha1_to_hex(object));
	}
 
	create_note(object, &msg, 0, note, new_note);
 
	if (is_null_sha1(new_note))
		remove_note(t, object);
	else if (add_note(t, object, new_note, combine_notes_overwrite))
		die("BUG: combine_notes_overwrite failed");
 
	snprintf(logmsg, sizeof(logmsg), "Notes %s by 'git notes %s'",
		 is_null_sha1(new_note) ? "removed" : "added", "add");
	commit_notes(t, logmsg);
out:
	free_notes(t);
	strbuf_release(&(msg.buf));
	return retval;
}
 
static int copy(int argc, const char **argv, const char *prefix)
{
	int retval = 0, force = 0, from_stdin = 0;
	const unsigned char *from_note, *note;
	const char *object_ref;
	unsigned char object[20], from_obj[20];
	struct notes_tree *t;
	const char *rewrite_cmd = NULL;
	struct option options[] = {
		OPT_BOOLEAN('f', "force", &force, "replace existing notes"),
		OPT_BOOLEAN(0, "stdin", &from_stdin, "read objects from stdin"),
		OPT_STRING(0, "for-rewrite", &rewrite_cmd, "command",
			   "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 < 2) {
		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_sha1(argv[0], from_obj))
		die("Failed to resolve '%s' as a valid ref.", argv[0]);
 
	object_ref = 1 < argc ? argv[1] : "HEAD";
 
	if (get_sha1(object_ref, object))
		die("Failed to resolve '%s' as a valid ref.", object_ref);
 
	t = init_notes_check("copy");
	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",
				       sha1_to_hex(object));
			goto out;
		}
		fprintf(stderr, "Overwriting existing notes for object %s\n",
			sha1_to_hex(object));
	}
 
	from_note = get_note(t, from_obj);
	if (!from_note) {
		retval = error("Missing notes on source object %s. Cannot "
			       "copy.", sha1_to_hex(from_obj));
		goto out;
	}
 
	if (add_note(t, object, from_note, combine_notes_overwrite))
		die("BUG: combine_notes_overwrite failed");
	commit_notes(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)
{
	const char *object_ref;
	struct notes_tree *t;
	unsigned char object[20], new_note[20];
	const unsigned char *note;
	char logmsg[100];
	const char * const *usage;
	struct msg_arg msg = { 0, 0, STRBUF_INIT };
	struct option options[] = {
		{ OPTION_CALLBACK, 'm', "message", &msg, "MSG",
			"note contents as a string", PARSE_OPT_NONEG,
			parse_msg_arg},
		{ OPTION_CALLBACK, 'F', "file", &msg, "FILE",
			"note contents in a file", PARSE_OPT_NONEG,
			parse_file_arg},
		{ OPTION_CALLBACK, 'c', "reedit-message", &msg, "OBJECT",
			"reuse and edit specified note object", PARSE_OPT_NONEG,
			parse_reedit_arg},
		{ OPTION_CALLBACK, 'C', "reuse-message", &msg, "OBJECT",
			"reuse specified note object", PARSE_OPT_NONEG,
			parse_reuse_arg},
		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 (msg.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_sha1(object_ref, object))
		die("Failed to resolve '%s' as a valid ref.", object_ref);
 
	t = init_notes_check(argv[0]);
	note = get_note(t, object);
 
	create_note(object, &msg, !edit, note, new_note);
 
	if (is_null_sha1(new_note))
		remove_note(t, object);
	else if (add_note(t, object, new_note, combine_notes_overwrite))
		die("BUG: combine_notes_overwrite failed");
 
	snprintf(logmsg, sizeof(logmsg), "Notes %s by 'git notes %s'",
		 is_null_sha1(new_note) ? "removed" : "added", argv[0]);
	commit_notes(t, logmsg);
	free_notes(t);
	strbuf_release(&(msg.buf));
	return 0;
}
 
static int show(int argc, const char **argv, const char *prefix)
{
	const char *object_ref;
	struct notes_tree *t;
	unsigned char object[20];
	const unsigned char *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_sha1(object_ref, object))
		die("Failed to resolve '%s' as a valid ref.", object_ref);
 
	t = init_notes_check("show");
	note = get_note(t, object);
 
	if (!note)
		retval = error("No note found for object %s.",
			       sha1_to_hex(object));
	else {
		const char *show_args[3] = {"show", sha1_to_hex(note), NULL};
		retval = execv_git_cmd(show_args);
	}
	free_notes(t);
	return retval;
}
 
static int merge(int argc, const char **argv, const char *prefix)
{
	struct strbuf remote_ref = STRBUF_INIT, msg = STRBUF_INIT;
	unsigned char result_sha1[20];
	struct notes_merge_options o;
	int verbosity = 0, result;
	struct option options[] = {
		OPT__VERBOSITY(&verbosity),
		OPT_END()
	};
 
	argc = parse_options(argc, argv, prefix, options,
			     git_notes_merge_usage, 0);
 
	if (argc != 1) {
		error("Must specify a notes ref to merge");
		usage_with_options(git_notes_merge_usage, options);
	}
 
	init_notes_merge_options(&o);
	o.verbosity = verbosity + NOTES_MERGE_VERBOSITY_DEFAULT;
 
	o.local_ref = default_notes_ref();
	strbuf_addstr(&remote_ref, argv[0]);
	expand_notes_ref(&remote_ref);
	o.remote_ref = remote_ref.buf;
 
	result = notes_merge(&o, result_sha1);
 
	strbuf_addf(&msg, "notes: Merged notes from %s into %s",
		    remote_ref.buf, default_notes_ref());
	if (result == 0) { /* Merge resulted (trivially) in result_sha1 */
		/* Update default notes ref with new commit */
		update_ref(msg.buf, default_notes_ref(), result_sha1, NULL,
			   0, DIE_ON_ERR);
	} else {
		/* TODO: */
		die("'git notes merge' cannot yet handle non-trivial merges!");
	}
 
	strbuf_release(&remote_ref);
	strbuf_release(&msg);
	return 0;
}
 
static int remove_cmd(int argc, const char **argv, const char *prefix)
{
	struct option options[] = {
		OPT_END()
	};
	const char *object_ref;
	struct notes_tree *t;
	unsigned char object[20];
 
	argc = parse_options(argc, argv, prefix, options,
			     git_notes_remove_usage, 0);
 
	if (1 < argc) {
		error("too many parameters");
		usage_with_options(git_notes_remove_usage, options);
	}
 
	object_ref = argc ? argv[0] : "HEAD";
 
	if (get_sha1(object_ref, object))
		die("Failed to resolve '%s' as a valid ref.", object_ref);
 
	t = init_notes_check("remove");
 
	fprintf(stderr, "Removing note for object %s\n", sha1_to_hex(object));
	remove_note(t, object);
 
	commit_notes(t, "Notes removed by 'git notes remove'");
	free_notes(t);
	return 0;
}
 
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_BOOLEAN('n', "dry-run", &show_only,
			    "do not remove, show only"),
		OPT_BOOLEAN('v', "verbose", &verbose, "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");
 
	prune_notes(t, (verbose ? NOTES_PRUNE_VERBOSE : 0) |
		(show_only ? NOTES_PRUNE_VERBOSE|NOTES_PRUNE_DRYRUN : 0) );
	if (!show_only)
		commit_notes(t, "Notes removed by 'git notes prune'");
	free_notes(t);
	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, "notes_ref",
			   "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 {
		result = error("Unknown subcommand: %s", argv[0]);
		usage_with_options(git_notes_usage, options);
	}
 
	return result ? 1 : 0;
}