summaryrefslogtreecommitdiff
path: root/builtin/tag.c
blob: e633f4efdbb8963449fddb5c3357fa657283430e (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
/*
 * Builtin "git tag"
 *
 * Copyright (c) 2007 Kristian Høgsberg <krh@redhat.com>,
 *                    Carlos Rica <jasampler@gmail.com>
 * Based on git-tag.sh and mktag.c by Linus Torvalds.
 */
 
#include "cache.h"
#include "builtin.h"
#include "refs.h"
#include "tag.h"
#include "run-command.h"
#include "parse-options.h"
#include "diff.h"
#include "revision.h"
#include "gpg-interface.h"
#include "sha1-array.h"
#include "column.h"
 
static const char * const git_tag_usage[] = {
	N_("git tag [-a|-s|-u <key-id>] [-f] [-m <msg>|-F <file>] <tagname> [<head>]"),
	N_("git tag -d <tagname>..."),
	N_("git tag -l [-n[<num>]] [--contains <commit>] [--points-at <object>] "
		"\n\t\t[<pattern>...]"),
	N_("git tag -v <tagname>..."),
	NULL
};
 
#define STRCMP_SORT     0	/* must be zero */
#define VERCMP_SORT     1
#define SORT_MASK       0x7fff
#define REVERSE_SORT    0x8000
 
static int tag_sort;
 
struct tag_filter {
	const char **patterns;
	int lines;
	int sort;
	struct string_list tags;
	struct commit_list *with_commit;
};
 
static struct sha1_array points_at;
static unsigned int colopts;
 
static int match_pattern(const char **patterns, const char *ref)
{
	/* no pattern means match everything */
	if (!*patterns)
		return 1;
	for (; *patterns; patterns++)
		if (!wildmatch(*patterns, ref, 0, NULL))
			return 1;
	return 0;
}
 
static const unsigned char *match_points_at(const char *refname,
					    const unsigned char *sha1)
{
	const unsigned char *tagged_sha1 = NULL;
	struct object *obj;
 
	if (sha1_array_lookup(&points_at, sha1) >= 0)
		return sha1;
	obj = parse_object(sha1);
	if (!obj)
		die(_("malformed object at '%s'"), refname);
	if (obj->type == OBJ_TAG)
		tagged_sha1 = ((struct tag *)obj)->tagged->sha1;
	if (tagged_sha1 && sha1_array_lookup(&points_at, tagged_sha1) >= 0)
		return tagged_sha1;
	return NULL;
}
 
static int in_commit_list(const struct commit_list *want, struct commit *c)
{
	for (; want; want = want->next)
		if (!hashcmp(want->item->object.sha1, c->object.sha1))
			return 1;
	return 0;
}
 
enum contains_result {
	CONTAINS_UNKNOWN = -1,
	CONTAINS_NO = 0,
	CONTAINS_YES = 1
};
 
/*
 * Test whether the candidate or one of its parents is contained in the list.
 * Do not recurse to find out, though, but return -1 if inconclusive.
 */
static enum contains_result contains_test(struct commit *candidate,
			    const struct commit_list *want)
{
	/* was it previously marked as containing a want commit? */
	if (candidate->object.flags & TMP_MARK)
		return 1;
	/* or marked as not possibly containing a want commit? */
	if (candidate->object.flags & UNINTERESTING)
		return 0;
	/* or are we it? */
	if (in_commit_list(want, candidate)) {
		candidate->object.flags |= TMP_MARK;
		return 1;
	}
 
	if (parse_commit(candidate) < 0)
		return 0;
 
	return -1;
}
 
/*
 * Mimicking the real stack, this stack lives on the heap, avoiding stack
 * overflows.
 *
 * At each recursion step, the stack items points to the commits whose
 * ancestors are to be inspected.
 */
struct stack {
	int nr, alloc;
	struct stack_entry {
		struct commit *commit;
		struct commit_list *parents;
	} *stack;
};
 
static void push_to_stack(struct commit *candidate, struct stack *stack)
{
	int index = stack->nr++;
	ALLOC_GROW(stack->stack, stack->nr, stack->alloc);
	stack->stack[index].commit = candidate;
	stack->stack[index].parents = candidate->parents;
}
 
static enum contains_result contains(struct commit *candidate,
		const struct commit_list *want)
{
	struct stack stack = { 0, 0, NULL };
	int result = contains_test(candidate, want);
 
	if (result != CONTAINS_UNKNOWN)
		return result;
 
	push_to_stack(candidate, &stack);
	while (stack.nr) {
		struct stack_entry *entry = &stack.stack[stack.nr - 1];
		struct commit *commit = entry->commit;
		struct commit_list *parents = entry->parents;
 
		if (!parents) {
			commit->object.flags |= UNINTERESTING;
			stack.nr--;
		}
		/*
		 * If we just popped the stack, parents->item has been marked,
		 * therefore contains_test will return a meaningful 0 or 1.
		 */
		else switch (contains_test(parents->item, want)) {
		case CONTAINS_YES:
			commit->object.flags |= TMP_MARK;
			stack.nr--;
			break;
		case CONTAINS_NO:
			entry->parents = parents->next;
			break;
		case CONTAINS_UNKNOWN:
			push_to_stack(parents->item, &stack);
			break;
		}
	}
	free(stack.stack);
	return contains_test(candidate, want);
}
 
static void show_tag_lines(const unsigned char *sha1, int lines)
{
	int i;
	unsigned long size;
	enum object_type type;
	char *buf, *sp, *eol;
	size_t len;
 
	buf = read_sha1_file(sha1, &type, &size);
	if (!buf)
		die_errno("unable to read object %s", sha1_to_hex(sha1));
	if (type != OBJ_COMMIT && type != OBJ_TAG)
		goto free_return;
	if (!size)
		die("an empty %s object %s?",
		    typename(type), sha1_to_hex(sha1));
 
	/* skip header */
	sp = strstr(buf, "\n\n");
	if (!sp)
		goto free_return;
 
	/* only take up to "lines" lines, and strip the signature from a tag */
	if (type == OBJ_TAG)
		size = parse_signature(buf, size);
	for (i = 0, sp += 2; i < lines && sp < buf + size; i++) {
		if (i)
			printf("\n    ");
		eol = memchr(sp, '\n', size - (sp - buf));
		len = eol ? eol - sp : size - (sp - buf);
		fwrite(sp, len, 1, stdout);
		if (!eol)
			break;
		sp = eol + 1;
	}
free_return:
	free(buf);
}
 
static int show_reference(const char *refname, const unsigned char *sha1,
			  int flag, void *cb_data)
{
	struct tag_filter *filter = cb_data;
 
	if (match_pattern(filter->patterns, refname)) {
		if (filter->with_commit) {
			struct commit *commit;
 
			commit = lookup_commit_reference_gently(sha1, 1);
			if (!commit)
				return 0;
			if (!contains(commit, filter->with_commit))
				return 0;
		}
 
		if (points_at.nr && !match_points_at(refname, sha1))
			return 0;
 
		if (!filter->lines) {
			if (filter->sort)
				string_list_append(&filter->tags, refname);
			else
				printf("%s\n", refname);
			return 0;
		}
		printf("%-15s ", refname);
		show_tag_lines(sha1, filter->lines);
		putchar('\n');
	}
 
	return 0;
}
 
static int sort_by_version(const void *a_, const void *b_)
{
	const struct string_list_item *a = a_;
	const struct string_list_item *b = b_;
	return versioncmp(a->string, b->string);
}
 
static int list_tags(const char **patterns, int lines,
		     struct commit_list *with_commit, int sort)
{
	struct tag_filter filter;
 
	filter.patterns = patterns;
	filter.lines = lines;
	filter.sort = sort;
	filter.with_commit = with_commit;
	memset(&filter.tags, 0, sizeof(filter.tags));
	filter.tags.strdup_strings = 1;
 
	for_each_tag_ref(show_reference, (void *) &filter);
	if (sort) {
		int i;
		if ((sort & SORT_MASK) == VERCMP_SORT)
			qsort(filter.tags.items, filter.tags.nr,
			      sizeof(struct string_list_item), sort_by_version);
		if (sort & REVERSE_SORT)
			for (i = filter.tags.nr - 1; i >= 0; i--)
				printf("%s\n", filter.tags.items[i].string);
		else
			for (i = 0; i < filter.tags.nr; i++)
				printf("%s\n", filter.tags.items[i].string);
		string_list_clear(&filter.tags, 0);
	}
	return 0;
}
 
typedef int (*each_tag_name_fn)(const char *name, const char *ref,
				const unsigned char *sha1);
 
static int for_each_tag_name(const char **argv, each_tag_name_fn fn)
{
	const char **p;
	char ref[PATH_MAX];
	int had_error = 0;
	unsigned char sha1[20];
 
	for (p = argv; *p; p++) {
		if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p)
					>= sizeof(ref)) {
			error(_("tag name too long: %.*s..."), 50, *p);
			had_error = 1;
			continue;
		}
		if (read_ref(ref, sha1)) {
			error(_("tag '%s' not found."), *p);
			had_error = 1;
			continue;
		}
		if (fn(*p, ref, sha1))
			had_error = 1;
	}
	return had_error;
}
 
static int delete_tag(const char *name, const char *ref,
				const unsigned char *sha1)
{
	if (delete_ref(ref, sha1, 0))
		return 1;
	printf(_("Deleted tag '%s' (was %s)\n"), name, find_unique_abbrev(sha1, DEFAULT_ABBREV));
	return 0;
}
 
static int verify_tag(const char *name, const char *ref,
				const unsigned char *sha1)
{
	const char *argv_verify_tag[] = {"verify-tag",
					"-v", "SHA1_HEX", NULL};
	argv_verify_tag[2] = sha1_to_hex(sha1);
 
	if (run_command_v_opt(argv_verify_tag, RUN_GIT_CMD))
		return error(_("could not verify the tag '%s'"), name);
	return 0;
}
 
static int do_sign(struct strbuf *buffer)
{
	return sign_buffer(buffer, buffer, get_signing_key());
}
 
static const char tag_template[] =
	N_("\nWrite a message for tag:\n  %s\n"
	"Lines starting with '%c' will be ignored.\n");
 
static const char tag_template_nocleanup[] =
	N_("\nWrite a message for tag:\n  %s\n"
	"Lines starting with '%c' will be kept; you may remove them"
	" yourself if you want to.\n");
 
/*
 * Parse a sort string, and return 0 if parsed successfully. Will return
 * non-zero when the sort string does not parse into a known type. If var is
 * given, the error message becomes a warning and includes information about
 * the configuration value.
 */
static int parse_sort_string(const char *var, const char *arg, int *sort)
{
	int type = 0, flags = 0;
 
	if (skip_prefix(arg, "-", &arg))
		flags |= REVERSE_SORT;
 
	if (skip_prefix(arg, "version:", &arg) || skip_prefix(arg, "v:", &arg))
		type = VERCMP_SORT;
	else
		type = STRCMP_SORT;
 
	if (strcmp(arg, "refname")) {
		if (!var)
			return error(_("unsupported sort specification '%s'"), arg);
		else {
			warning(_("unsupported sort specification '%s' in variable '%s'"),
				var, arg);
			return -1;
		}
	}
 
	*sort = (type | flags);
 
	return 0;
}
 
static int git_tag_config(const char *var, const char *value, void *cb)
{
	int status;
 
	if (!strcmp(var, "tag.sort")) {
		if (!value)
			return config_error_nonbool(var);
		parse_sort_string(var, value, &tag_sort);
		return 0;
	}
 
	status = git_gpg_config(var, value, cb);
	if (status)
		return status;
	if (starts_with(var, "column."))
		return git_column_config(var, value, "tag", &colopts);
	return git_default_config(var, value, cb);
}
 
static void write_tag_body(int fd, const unsigned char *sha1)
{
	unsigned long size;
	enum object_type type;
	char *buf, *sp;
 
	buf = read_sha1_file(sha1, &type, &size);
	if (!buf)
		return;
	/* skip header */
	sp = strstr(buf, "\n\n");
 
	if (!sp || !size || type != OBJ_TAG) {
		free(buf);
		return;
	}
	sp += 2; /* skip the 2 LFs */
	write_or_die(fd, sp, parse_signature(sp, buf + size - sp));
 
	free(buf);
}
 
static int build_tag_object(struct strbuf *buf, int sign, unsigned char *result)
{
	if (sign && do_sign(buf) < 0)
		return error(_("unable to sign the tag"));
	if (write_sha1_file(buf->buf, buf->len, tag_type, result) < 0)
		return error(_("unable to write tag file"));
	return 0;
}
 
struct create_tag_options {
	unsigned int message_given:1;
	unsigned int sign;
	enum {
		CLEANUP_NONE,
		CLEANUP_SPACE,
		CLEANUP_ALL
	} cleanup_mode;
};
 
static void create_tag(const unsigned char *object, const char *tag,
		       struct strbuf *buf, struct create_tag_options *opt,
		       unsigned char *prev, unsigned char *result)
{
	enum object_type type;
	char header_buf[1024];
	int header_len;
	char *path = NULL;
 
	type = sha1_object_info(object, NULL);
	if (type <= OBJ_NONE)
	    die(_("bad object type."));
 
	header_len = snprintf(header_buf, sizeof(header_buf),
			  "object %s\n"
			  "type %s\n"
			  "tag %s\n"
			  "tagger %s\n\n",
			  sha1_to_hex(object),
			  typename(type),
			  tag,
			  git_committer_info(IDENT_STRICT));
 
	if (header_len > sizeof(header_buf) - 1)
		die(_("tag header too big."));
 
	if (!opt->message_given) {
		int fd;
 
		/* write the template message before editing: */
		path = git_pathdup("TAG_EDITMSG");
		fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
		if (fd < 0)
			die_errno(_("could not create file '%s'"), path);
 
		if (!is_null_sha1(prev)) {
			write_tag_body(fd, prev);
		} else {
			struct strbuf buf = STRBUF_INIT;
			strbuf_addch(&buf, '\n');
			if (opt->cleanup_mode == CLEANUP_ALL)
				strbuf_commented_addf(&buf, _(tag_template), tag, comment_line_char);
			else
				strbuf_commented_addf(&buf, _(tag_template_nocleanup), tag, comment_line_char);
			write_or_die(fd, buf.buf, buf.len);
			strbuf_release(&buf);
		}
		close(fd);
 
		if (launch_editor(path, buf, NULL)) {
			fprintf(stderr,
			_("Please supply the message using either -m or -F option.\n"));
			exit(1);
		}
	}
 
	if (opt->cleanup_mode != CLEANUP_NONE)
		stripspace(buf, opt->cleanup_mode == CLEANUP_ALL);
 
	if (!opt->message_given && !buf->len)
		die(_("no tag message?"));
 
	strbuf_insert(buf, 0, header_buf, header_len);
 
	if (build_tag_object(buf, opt->sign, result) < 0) {
		if (path)
			fprintf(stderr, _("The tag message has been left in %s\n"),
				path);
		exit(128);
	}
	if (path) {
		unlink_or_warn(path);
		free(path);
	}
}
 
struct msg_arg {
	int given;
	struct strbuf buf;
};
 
static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
{
	struct msg_arg *msg = opt->value;
 
	if (!arg)
		return -1;
	if (msg->buf.len)
		strbuf_addstr(&(msg->buf), "\n\n");
	strbuf_addstr(&(msg->buf), arg);
	msg->given = 1;
	return 0;
}
 
static int strbuf_check_tag_ref(struct strbuf *sb, const char *name)
{
	if (name[0] == '-')
		return -1;
 
	strbuf_reset(sb);
	strbuf_addf(sb, "refs/tags/%s", name);
 
	return check_refname_format(sb->buf, 0);
}
 
static int parse_opt_points_at(const struct option *opt __attribute__((unused)),
			const char *arg, int unset)
{
	unsigned char sha1[20];
 
	if (unset) {
		sha1_array_clear(&points_at);
		return 0;
	}
	if (!arg)
		return error(_("switch 'points-at' requires an object"));
	if (get_sha1(arg, sha1))
		return error(_("malformed object name '%s'"), arg);
	sha1_array_append(&points_at, sha1);
	return 0;
}
 
static int parse_opt_sort(const struct option *opt, const char *arg, int unset)
{
	int *sort = opt->value;
 
	return parse_sort_string(NULL, arg, sort);
}
 
int cmd_tag(int argc, const char **argv, const char *prefix)
{
	struct strbuf buf = STRBUF_INIT;
	struct strbuf ref = STRBUF_INIT;
	unsigned char object[20], prev[20];
	const char *object_ref, *tag;
	struct create_tag_options opt;
	char *cleanup_arg = NULL;
	int annotate = 0, force = 0, lines = -1;
	int cmdmode = 0;
	const char *msgfile = NULL, *keyid = NULL;
	struct msg_arg msg = { 0, STRBUF_INIT };
	struct commit_list *with_commit = NULL;
	struct ref_transaction *transaction;
	struct strbuf err = STRBUF_INIT;
	struct option options[] = {
		OPT_CMDMODE('l', "list", &cmdmode, N_("list tag names"), 'l'),
		{ OPTION_INTEGER, 'n', NULL, &lines, N_("n"),
				N_("print <n> lines of each tag message"),
				PARSE_OPT_OPTARG, NULL, 1 },
		OPT_CMDMODE('d', "delete", &cmdmode, N_("delete tags"), 'd'),
		OPT_CMDMODE('v', "verify", &cmdmode, N_("verify tags"), 'v'),
 
		OPT_GROUP(N_("Tag creation options")),
		OPT_BOOL('a', "annotate", &annotate,
					N_("annotated tag, needs a message")),
		OPT_CALLBACK('m', "message", &msg, N_("message"),
			     N_("tag message"), parse_msg_arg),
		OPT_FILENAME('F', "file", &msgfile, N_("read message from file")),
		OPT_BOOL('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
		OPT_STRING(0, "cleanup", &cleanup_arg, N_("mode"),
			N_("how to strip spaces and #comments from message")),
		OPT_STRING('u', "local-user", &keyid, N_("key-id"),
					N_("use another key to sign the tag")),
		OPT__FORCE(&force, N_("replace the tag if exists")),
		OPT_COLUMN(0, "column", &colopts, N_("show tag list in columns")),
		{
			OPTION_CALLBACK, 0, "sort", &tag_sort, N_("type"), N_("sort tags"),
			PARSE_OPT_NONEG, parse_opt_sort
		},
 
		OPT_GROUP(N_("Tag listing options")),
		{
			OPTION_CALLBACK, 0, "contains", &with_commit, N_("commit"),
			N_("print only tags that contain the commit"),
			PARSE_OPT_LASTARG_DEFAULT,
			parse_opt_with_commit, (intptr_t)"HEAD",
		},
		{
			OPTION_CALLBACK, 0, "with", &with_commit, N_("commit"),
			N_("print only tags that contain the commit"),
			PARSE_OPT_HIDDEN | PARSE_OPT_LASTARG_DEFAULT,
			parse_opt_with_commit, (intptr_t)"HEAD",
		},
		{
			OPTION_CALLBACK, 0, "points-at", NULL, N_("object"),
			N_("print only tags of the object"), 0, parse_opt_points_at
		},
		OPT_END()
	};
 
	git_config(git_tag_config, NULL);
 
	memset(&opt, 0, sizeof(opt));
 
	argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 
	if (keyid) {
		opt.sign = 1;
		set_signing_key(keyid);
	}
	if (opt.sign)
		annotate = 1;
	if (argc == 0 && !cmdmode)
		cmdmode = 'l';
 
	if ((annotate || msg.given || msgfile || force) && (cmdmode != 0))
		usage_with_options(git_tag_usage, options);
 
	finalize_colopts(&colopts, -1);
	if (cmdmode == 'l' && lines != -1) {
		if (explicitly_enable_column(colopts))
			die(_("--column and -n are incompatible"));
		colopts = 0;
	}
	if (cmdmode == 'l') {
		int ret;
		if (column_active(colopts)) {
			struct column_options copts;
			memset(&copts, 0, sizeof(copts));
			copts.padding = 2;
			run_column_filter(colopts, &copts);
		}
		if (lines != -1 && tag_sort)
			die(_("--sort and -n are incompatible"));
		ret = list_tags(argv, lines == -1 ? 0 : lines, with_commit, tag_sort);
		if (column_active(colopts))
			stop_column_filter();
		return ret;
	}
	if (lines != -1)
		die(_("-n option is only allowed with -l."));
	if (with_commit)
		die(_("--contains option is only allowed with -l."));
	if (points_at.nr)
		die(_("--points-at option is only allowed with -l."));
	if (cmdmode == 'd')
		return for_each_tag_name(argv, delete_tag);
	if (cmdmode == 'v')
		return for_each_tag_name(argv, verify_tag);
 
	if (msg.given || msgfile) {
		if (msg.given && msgfile)
			die(_("only one -F or -m option is allowed."));
		annotate = 1;
		if (msg.given)
			strbuf_addbuf(&buf, &(msg.buf));
		else {
			if (!strcmp(msgfile, "-")) {
				if (strbuf_read(&buf, 0, 1024) < 0)
					die_errno(_("cannot read '%s'"), msgfile);
			} else {
				if (strbuf_read_file(&buf, msgfile, 1024) < 0)
					die_errno(_("could not open or read '%s'"),
						msgfile);
			}
		}
	}
 
	tag = argv[0];
 
	object_ref = argc == 2 ? argv[1] : "HEAD";
	if (argc > 2)
		die(_("too many params"));
 
	if (get_sha1(object_ref, object))
		die(_("Failed to resolve '%s' as a valid ref."), object_ref);
 
	if (strbuf_check_tag_ref(&ref, tag))
		die(_("'%s' is not a valid tag name."), tag);
 
	if (read_ref(ref.buf, prev))
		hashclr(prev);
	else if (!force)
		die(_("tag '%s' already exists"), tag);
 
	opt.message_given = msg.given || msgfile;
 
	if (!cleanup_arg || !strcmp(cleanup_arg, "strip"))
		opt.cleanup_mode = CLEANUP_ALL;
	else if (!strcmp(cleanup_arg, "verbatim"))
		opt.cleanup_mode = CLEANUP_NONE;
	else if (!strcmp(cleanup_arg, "whitespace"))
		opt.cleanup_mode = CLEANUP_SPACE;
	else
		die(_("Invalid cleanup mode %s"), cleanup_arg);
 
	if (annotate)
		create_tag(object, tag, &buf, &opt, prev, object);
 
	transaction = ref_transaction_begin(&err);
	if (!transaction ||
	    ref_transaction_update(transaction, ref.buf, object, prev,
				   0, 1, NULL, &err) ||
	    ref_transaction_commit(transaction, &err))
		die("%s", err.buf);
	ref_transaction_free(transaction);
	if (force && !is_null_sha1(prev) && hashcmp(prev, object))
		printf(_("Updated tag '%s' (was %s)\n"), tag, find_unique_abbrev(prev, DEFAULT_ABBREV));
 
	strbuf_release(&err);
	strbuf_release(&buf);
	strbuf_release(&ref);
	return 0;
}