[thirdparty/git.git] / builtin / update-ref.c

#include "cache.h"
#include "refs.h"
#include "builtin.h"
#include "parse-options.h"
#include "quote.h"
#include "argv-array.h"

static const char * const git_update_ref_usage[] = {
	N_("git update-ref [options] -d <refname> [<oldval>]"),
	N_("git update-ref [options]    <refname> <newval> [<oldval>]"),
	N_("git update-ref [options] --stdin [-z]"),
	NULL
};

static int updates_alloc;
static int updates_count;
static struct ref_update **updates;

static char line_termination = '\n';
static int update_flags;

static struct ref_update *update_alloc(void)
{
	struct ref_update *update;

	/* Allocate and zero-init a struct ref_update */
	update = xcalloc(1, sizeof(*update));
	ALLOC_GROW(updates, updates_count + 1, updates_alloc);
	updates[updates_count++] = update;

	/* Store and reset accumulated options */
	update->flags = update_flags;
	update_flags = 0;

	return update;
}

/*
 * Parse one whitespace- or NUL-terminated, possibly C-quoted argument
 * and append the result to arg.  Return a pointer to the terminator.
 * Die if there is an error in how the argument is C-quoted.  This
 * function is only used if not -z.
 */
static const char *parse_arg(const char *next, struct strbuf *arg)
{
	if (*next == '"') {
		const char *orig = next;

		if (unquote_c_style(arg, next, &next))
			die("badly quoted argument: %s", orig);
		if (*next && !isspace(*next))
			die("unexpected character after quoted argument: %s", orig);
	} else {
		while (*next && !isspace(*next))
			strbuf_addch(arg, *next++);
	}

	return next;
}

/*
 * Parse the reference name immediately after "command SP".  If not
 * -z, then handle C-quoting.  Return a pointer to a newly allocated
 * string containing the name of the reference, or NULL if there was
 * an error.  Update *next to point at the character that terminates
 * the argument.  Die if C-quoting is malformed or the reference name
 * is invalid.
 */
static char *parse_refname(struct strbuf *input, const char **next)
{
	struct strbuf ref = STRBUF_INIT;

	if (line_termination) {
		/* Without -z, use the next argument */
		*next = parse_arg(*next, &ref);
	} else {
		/* With -z, use everything up to the next NUL */
		strbuf_addstr(&ref, *next);
		*next += ref.len;
	}

	if (!ref.len) {
		strbuf_release(&ref);
		return NULL;
	}

	if (check_refname_format(ref.buf, REFNAME_ALLOW_ONELEVEL))
		die("invalid ref format: %s", ref.buf);

	return strbuf_detach(&ref, NULL);
}

/*
 * The value being parsed is <oldvalue> (as opposed to <newvalue>; the
 * difference affects which error messages are generated):
 */
#define PARSE_SHA1_OLD 0x01

/*
 * For backwards compatibility, accept an empty string for update's
 * <newvalue> in binary mode to be equivalent to specifying zeros.
 */
#define PARSE_SHA1_ALLOW_EMPTY 0x02

/*
 * Parse an argument separator followed by the next argument, if any.
 * If there is an argument, convert it to a SHA-1, write it to sha1,
 * set *next to point at the character terminating the argument, and
 * return 0.  If there is no argument at all (not even the empty
 * string), return 1 and leave *next unchanged.  If the value is
 * provided but cannot be converted to a SHA-1, die.  flags can
 * include PARSE_SHA1_OLD and/or PARSE_SHA1_ALLOW_EMPTY.
 */
static int parse_next_sha1(struct strbuf *input, const char **next,
			   unsigned char *sha1,
			   const char *command, const char *refname,
			   int flags)
{
	struct strbuf arg = STRBUF_INIT;
	int ret = 0;

	if (*next == input->buf + input->len)
		goto eof;

	if (line_termination) {
		/* Without -z, consume SP and use next argument */
		if (!**next || **next == line_termination)
			return 1;
		if (**next != ' ')
			die("%s %s: expected SP but got: %s",
			    command, refname, *next);
		(*next)++;
		*next = parse_arg(*next, &arg);
		if (arg.len) {
			if (get_sha1(arg.buf, sha1))
				goto invalid;
		} else {
			/* Without -z, an empty value means all zeros: */
			hashclr(sha1);
		}
	} else {
		/* With -z, read the next NUL-terminated line */
		if (**next)
			die("%s %s: expected NUL but got: %s",
			    command, refname, *next);
		(*next)++;
		if (*next == input->buf + input->len)
			goto eof;
		strbuf_addstr(&arg, *next);
		*next += arg.len;

		if (arg.len) {
			if (get_sha1(arg.buf, sha1))
				goto invalid;
		} else if (flags & PARSE_SHA1_ALLOW_EMPTY) {
			/* With -z, treat an empty value as all zeros: */
			hashclr(sha1);
		} else {
			/*
			 * With -z, an empty non-required value means
			 * unspecified:
			 */
			ret = 1;
		}
	}

	strbuf_release(&arg);

	return ret;

 invalid:
	die(flags & PARSE_SHA1_OLD ?
	    "%s %s: invalid <oldvalue>: %s" :
	    "%s %s: invalid <newvalue>: %s",
	    command, refname, arg.buf);

 eof:
	die(flags & PARSE_SHA1_OLD ?
	    "%s %s missing <oldvalue>" :
	    "%s %s missing <newvalue>",
	    command, refname);
}


/*
 * The following five parse_cmd_*() functions parse the corresponding
 * command.  In each case, next points at the character following the
 * command name and the following space.  They each return a pointer
 * to the character terminating the command, and die with an
 * explanatory message if there are any parsing problems.  All of
 * these functions handle either text or binary format input,
 * depending on how line_termination is set.
 */

static const char *parse_cmd_update(struct strbuf *input, const char *next)
{
	struct ref_update *update;

	update = update_alloc();

	update->ref_name = parse_refname(input, &next);
	if (!update->ref_name)
		die("update line missing <ref>");

	if (parse_next_sha1(input, &next, update->new_sha1,
			    "update", update->ref_name,
			    PARSE_SHA1_ALLOW_EMPTY))
		die("update %s missing <newvalue>", update->ref_name);

	update->have_old = !parse_next_sha1(input, &next, update->old_sha1,
					    "update", update->ref_name,
					    PARSE_SHA1_OLD);

	if (*next != line_termination)
		die("update %s has extra input: %s", update->ref_name, next);

	return next;
}

static const char *parse_cmd_create(struct strbuf *input, const char *next)
{
	struct ref_update *update;

	update = update_alloc();

	update->ref_name = parse_refname(input, &next);
	if (!update->ref_name)
		die("create line missing <ref>");

	if (parse_next_sha1(input, &next, update->new_sha1,
			    "create", update->ref_name, 0))
		die("create %s missing <newvalue>", update->ref_name);

	if (is_null_sha1(update->new_sha1))
		die("create %s given zero <newvalue>", update->ref_name);

	if (*next != line_termination)
		die("create %s has extra input: %s", update->ref_name, next);

	return next;
}

static const char *parse_cmd_delete(struct strbuf *input, const char *next)
{
	struct ref_update *update;

	update = update_alloc();

	update->ref_name = parse_refname(input, &next);
	if (!update->ref_name)
		die("delete line missing <ref>");

	if (parse_next_sha1(input, &next, update->old_sha1,
			    "delete", update->ref_name, PARSE_SHA1_OLD)) {
		update->have_old = 0;
	} else {
		if (is_null_sha1(update->old_sha1))
			die("delete %s given zero <oldvalue>", update->ref_name);
		update->have_old = 1;
	}

	if (*next != line_termination)
		die("delete %s has extra input: %s", update->ref_name, next);

	return next;
}

static const char *parse_cmd_verify(struct strbuf *input, const char *next)
{
	struct ref_update *update;

	update = update_alloc();

	update->ref_name = parse_refname(input, &next);
	if (!update->ref_name)
		die("verify line missing <ref>");

	if (parse_next_sha1(input, &next, update->old_sha1,
			    "verify", update->ref_name, PARSE_SHA1_OLD)) {
		update->have_old = 0;
	} else {
		hashcpy(update->new_sha1, update->old_sha1);
		update->have_old = 1;
	}

	if (*next != line_termination)
		die("verify %s has extra input: %s", update->ref_name, next);

	return next;
}

static const char *parse_cmd_option(struct strbuf *input, const char *next)
{
	if (!strncmp(next, "no-deref", 8) && next[8] == line_termination)
		update_flags |= REF_NODEREF;
	else
		die("option unknown: %s", next);
	return next + 8;
}

static void update_refs_stdin(void)
{
	struct strbuf input = STRBUF_INIT;
	const char *next;

	if (strbuf_read(&input, 0, 1000) < 0)
		die_errno("could not read from stdin");
	next = input.buf;
	/* Read each line dispatch its command */
	while (next < input.buf + input.len) {
		if (*next == line_termination)
			die("empty command in input");
		else if (isspace(*next))
			die("whitespace before command: %s", next);
		else if (starts_with(next, "update "))
			next = parse_cmd_update(&input, next + 7);
		else if (starts_with(next, "create "))
			next = parse_cmd_create(&input, next + 7);
		else if (starts_with(next, "delete "))
			next = parse_cmd_delete(&input, next + 7);
		else if (starts_with(next, "verify "))
			next = parse_cmd_verify(&input, next + 7);
		else if (starts_with(next, "option "))
			next = parse_cmd_option(&input, next + 7);
		else
			die("unknown command: %s", next);

		next++;
	}

	strbuf_release(&input);
}

int cmd_update_ref(int argc, const char **argv, const char *prefix)
{
	const char *refname, *oldval, *msg = NULL;
	unsigned char sha1[20], oldsha1[20];
	int delete = 0, no_deref = 0, read_stdin = 0, end_null = 0, flags = 0;
	struct option options[] = {
		OPT_STRING( 'm', NULL, &msg, N_("reason"), N_("reason of the update")),
		OPT_BOOL('d', NULL, &delete, N_("delete the reference")),
		OPT_BOOL( 0 , "no-deref", &no_deref,
					N_("update <refname> not the one it points to")),
		OPT_BOOL('z', NULL, &end_null, N_("stdin has NUL-terminated arguments")),
		OPT_BOOL( 0 , "stdin", &read_stdin, N_("read updates from stdin")),
		OPT_END(),
	};

	git_config(git_default_config, NULL);
	argc = parse_options(argc, argv, prefix, options, git_update_ref_usage,
			     0);
	if (msg && !*msg)
		die("Refusing to perform update with empty message.");

	if (read_stdin) {
		if (delete || no_deref || argc > 0)
			usage_with_options(git_update_ref_usage, options);
		if (end_null)
			line_termination = '\0';
		update_refs_stdin();
		return update_refs(msg, updates, updates_count,
				   UPDATE_REFS_DIE_ON_ERR);
	}

	if (end_null)
		usage_with_options(git_update_ref_usage, options);

	if (delete) {
		if (argc < 1 || argc > 2)
			usage_with_options(git_update_ref_usage, options);
		refname = argv[0];
		oldval = argv[1];
	} else {
		const char *value;
		if (argc < 2 || argc > 3)
			usage_with_options(git_update_ref_usage, options);
		refname = argv[0];
		value = argv[1];
		oldval = argv[2];
		if (get_sha1(value, sha1))
			die("%s: not a valid SHA1", value);
	}

	hashclr(oldsha1); /* all-zero hash in case oldval is the empty string */
	if (oldval && *oldval && get_sha1(oldval, oldsha1))
		die("%s: not a valid old SHA1", oldval);

	if (no_deref)
		flags = REF_NODEREF;
	if (delete)
		return delete_ref(refname, oldval ? oldsha1 : NULL, flags);
	else
		return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
				  flags, UPDATE_REFS_DIE_ON_ERR);
}
Commit	Line	Data
66bf85a4 LT	1	#include "cache.h"
66bf85a4 LT	2	#include "refs.h"
854b4629	3	#include "builtin.h"
89942be6	4	#include "parse-options.h"
c750ba95 BK	5	#include "quote.h"
c750ba95 BK	6	#include "argv-array.h"
66bf85a4	7
89942be6	8	static const char * const git_update_ref_usage[] = {
82269505 NTND	9	N_("git update-ref [options] -d <refname> [<oldval>]"),
82269505 NTND	10	N_("git update-ref [options] <refname> <newval> [<oldval>]"),
c750ba95	11	N_("git update-ref [options] --stdin [-z]"),
89942be6 PH	12	NULL
89942be6 PH	13	};
152da3df	14
c750ba95 BK	15	static int updates_alloc;
c750ba95 BK	16	static int updates_count;
595deb8d	17	static struct ref_update **updates;
c750ba95 BK	18
	19	static char line_termination = '\n';
	20	static int update_flags;
	21
	22	static struct ref_update *update_alloc(void)
	23	{
	24	struct ref_update *update;
	25
	26	/* Allocate and zero-init a struct ref_update */
	27	update = xcalloc(1, sizeof(*update));
	28	ALLOC_GROW(updates, updates_count + 1, updates_alloc);
	29	updates[updates_count++] = update;
	30
	31	/* Store and reset accumulated options */
	32	update->flags = update_flags;
	33	update_flags = 0;
	34
	35	return update;
	36	}
	37
697a4151 MH	38	/*
	39	* Parse one whitespace- or NUL-terminated, possibly C-quoted argument
	40	* and append the result to arg. Return a pointer to the terminator.
	41	* Die if there is an error in how the argument is C-quoted. This
	42	* function is only used if not -z.
	43	*/
c750ba95 BK	44	static const char parse_arg(const char next, struct strbuf *arg)
c750ba95 BK	45	{
697a4151 MH	46	if (*next == '"') {
	47	const char *orig = next;
	48
	49	if (unquote_c_style(arg, next, &next))
	50	die("badly quoted argument: %s", orig);
	51	if (next && !isspace(next))
	52	die("unexpected character after quoted argument: %s", orig);
	53	} else {
c750ba95 BK	54	while (next && !isspace(next))
c750ba95 BK	55	strbuf_addch(arg, *next++);
697a4151	56	}
c750ba95	57
c750ba95 BK	58	return next;
	59	}
	60
e23d8435	61	/*
ed410e61 MH	62	* Parse the reference name immediately after "command SP". If not
	63	* -z, then handle C-quoting. Return a pointer to a newly allocated
	64	* string containing the name of the reference, or NULL if there was
	65	* an error. Update *next to point at the character that terminates
	66	* the argument. Die if C-quoting is malformed or the reference name
	67	* is invalid.
e23d8435	68	*/
ed410e61	69	static char parse_refname(struct strbuf input, const char **next)
c750ba95	70	{
ed410e61 MH	71	struct strbuf ref = STRBUF_INIT;
ed410e61 MH	72
c750ba95 BK	73	if (line_termination) {
c750ba95 BK	74	/* Without -z, use the next argument */
ed410e61	75	next = parse_arg(next, &ref);
c750ba95	76	} else {
e23d8435	77	/* With -z, use everything up to the next NUL */
ed410e61 MH	78	strbuf_addstr(&ref, *next);
	79	*next += ref.len;
	80	}
	81
	82	if (!ref.len) {
	83	strbuf_release(&ref);
	84	return NULL;
c750ba95	85	}
ed410e61 MH	86
	87	if (check_refname_format(ref.buf, REFNAME_ALLOW_ONELEVEL))
	88	die("invalid ref format: %s", ref.buf);
	89
	90	return strbuf_detach(&ref, NULL);
c750ba95 BK	91	}
c750ba95 BK	92
e23d8435	93	/*
3afcc463 MH	94	* The value being parsed is <oldvalue> (as opposed to <newvalue>; the
	95	* difference affects which error messages are generated):
	96	*/
	97	#define PARSE_SHA1_OLD 0x01
	98
	99	/*
	100	* For backwards compatibility, accept an empty string for update's
	101	* <newvalue> in binary mode to be equivalent to specifying zeros.
	102	*/
	103	#define PARSE_SHA1_ALLOW_EMPTY 0x02
	104
	105	/*
	106	* Parse an argument separator followed by the next argument, if any.
	107	* If there is an argument, convert it to a SHA-1, write it to sha1,
	108	* set *next to point at the character terminating the argument, and
e23d8435	109	* return 0. If there is no argument at all (not even the empty
3afcc463 MH	110	* string), return 1 and leave *next unchanged. If the value is
	111	* provided but cannot be converted to a SHA-1, die. flags can
	112	* include PARSE_SHA1_OLD and/or PARSE_SHA1_ALLOW_EMPTY.
e23d8435	113	*/
3afcc463 MH	114	static int parse_next_sha1(struct strbuf input, const char *next,
	115	unsigned char *sha1,
	116	const char command, const char refname,
	117	int flags)
c750ba95	118	{
3afcc463 MH	119	struct strbuf arg = STRBUF_INIT;
	120	int ret = 0;
	121
	122	if (*next == input->buf + input->len)
	123	goto eof;
	124
c750ba95 BK	125	if (line_termination) {
c750ba95 BK	126	/* Without -z, consume SP and use next argument */
e23d8435	127	if (!next \|\| next == line_termination)
3afcc463	128	return 1;
e23d8435	129	if (**next != ' ')
3afcc463 MH	130	die("%s %s: expected SP but got: %s",
3afcc463 MH	131	command, refname, *next);
e23d8435	132	(*next)++;
3afcc463 MH	133	next = parse_arg(next, &arg);
	134	if (arg.len) {
	135	if (get_sha1(arg.buf, sha1))
	136	goto invalid;
	137	} else {
	138	/* Without -z, an empty value means all zeros: */
	139	hashclr(sha1);
	140	}
c750ba95 BK	141	} else {
c750ba95 BK	142	/* With -z, read the next NUL-terminated line */
e23d8435	143	if (**next)
3afcc463 MH	144	die("%s %s: expected NUL but got: %s",
3afcc463 MH	145	command, refname, *next);
e23d8435 MH	146	(*next)++;
e23d8435 MH	147	if (*next == input->buf + input->len)
3afcc463 MH	148	goto eof;
	149	strbuf_addstr(&arg, *next);
	150	*next += arg.len;
	151
	152	if (arg.len) {
	153	if (get_sha1(arg.buf, sha1))
	154	goto invalid;
	155	} else if (flags & PARSE_SHA1_ALLOW_EMPTY) {
	156	/* With -z, treat an empty value as all zeros: */
	157	hashclr(sha1);
	158	} else {
	159	/*
	160	* With -z, an empty non-required value means
	161	* unspecified:
	162	*/
	163	ret = 1;
	164	}
c750ba95	165	}
3afcc463 MH	166
	167	strbuf_release(&arg);
	168
	169	return ret;
	170
	171	invalid:
	172	die(flags & PARSE_SHA1_OLD ?
	173	"%s %s: invalid <oldvalue>: %s" :
	174	"%s %s: invalid <newvalue>: %s",
	175	command, refname, arg.buf);
	176
	177	eof:
	178	die(flags & PARSE_SHA1_OLD ?
	179	"%s %s missing <oldvalue>" :
	180	"%s %s missing <newvalue>",
	181	command, refname);
c750ba95 BK	182	}
c750ba95 BK	183
e23d8435 MH	184
	185	/*
	186	* The following five parse_cmd_*() functions parse the corresponding
	187	* command. In each case, next points at the character following the
	188	* command name and the following space. They each return a pointer
	189	* to the character terminating the command, and die with an
	190	* explanatory message if there are any parsing problems. All of
	191	* these functions handle either text or binary format input,
	192	* depending on how line_termination is set.
	193	*/
	194
	195	static const char parse_cmd_update(struct strbuf input, const char *next)
c750ba95	196	{
c750ba95 BK	197	struct ref_update *update;
	198
	199	update = update_alloc();
	200
ed410e61 MH	201	update->ref_name = parse_refname(input, &next);
ed410e61 MH	202	if (!update->ref_name)
c750ba95 BK	203	die("update line missing <ref>");
c750ba95 BK	204
3afcc463 MH	205	if (parse_next_sha1(input, &next, update->new_sha1,
	206	"update", update->ref_name,
	207	PARSE_SHA1_ALLOW_EMPTY))
ed410e61	208	die("update %s missing <newvalue>", update->ref_name);
c750ba95	209
3afcc463 MH	210	update->have_old = !parse_next_sha1(input, &next, update->old_sha1,
	211	"update", update->ref_name,
	212	PARSE_SHA1_OLD);
	213
	214	if (*next != line_termination)
	215	die("update %s has extra input: %s", update->ref_name, next);
c750ba95	216
e23d8435	217	return next;
c750ba95 BK	218	}
c750ba95 BK	219
e23d8435	220	static const char parse_cmd_create(struct strbuf input, const char *next)
c750ba95	221	{
c750ba95 BK	222	struct ref_update *update;
	223
	224	update = update_alloc();
	225
ed410e61 MH	226	update->ref_name = parse_refname(input, &next);
ed410e61 MH	227	if (!update->ref_name)
c750ba95 BK	228	die("create line missing <ref>");
c750ba95 BK	229
3afcc463 MH	230	if (parse_next_sha1(input, &next, update->new_sha1,
3afcc463 MH	231	"create", update->ref_name, 0))
ed410e61	232	die("create %s missing <newvalue>", update->ref_name);
e23d8435	233
c750ba95	234	if (is_null_sha1(update->new_sha1))
9255f059	235	die("create %s given zero <newvalue>", update->ref_name);
c750ba95	236
e23d8435	237	if (*next != line_termination)
ed410e61	238	die("create %s has extra input: %s", update->ref_name, next);
e23d8435 MH	239
e23d8435 MH	240	return next;
c750ba95 BK	241	}
c750ba95 BK	242
e23d8435	243	static const char parse_cmd_delete(struct strbuf input, const char *next)
c750ba95	244	{
c750ba95 BK	245	struct ref_update *update;
	246
	247	update = update_alloc();
	248
ed410e61 MH	249	update->ref_name = parse_refname(input, &next);
ed410e61 MH	250	if (!update->ref_name)
c750ba95 BK	251	die("delete line missing <ref>");
c750ba95 BK	252
3afcc463 MH	253	if (parse_next_sha1(input, &next, update->old_sha1,
	254	"delete", update->ref_name, PARSE_SHA1_OLD)) {
	255	update->have_old = 0;
	256	} else {
	257	if (is_null_sha1(update->old_sha1))
9255f059	258	die("delete %s given zero <oldvalue>", update->ref_name);
3afcc463 MH	259	update->have_old = 1;
3afcc463 MH	260	}
c750ba95	261
e23d8435	262	if (*next != line_termination)
ed410e61	263	die("delete %s has extra input: %s", update->ref_name, next);
e23d8435 MH	264
e23d8435 MH	265	return next;
c750ba95 BK	266	}
c750ba95 BK	267
e23d8435	268	static const char parse_cmd_verify(struct strbuf input, const char *next)
c750ba95	269	{
c750ba95 BK	270	struct ref_update *update;
	271
	272	update = update_alloc();
	273
ed410e61 MH	274	update->ref_name = parse_refname(input, &next);
ed410e61 MH	275	if (!update->ref_name)
c750ba95 BK	276	die("verify line missing <ref>");
c750ba95 BK	277
3afcc463 MH	278	if (parse_next_sha1(input, &next, update->old_sha1,
	279	"verify", update->ref_name, PARSE_SHA1_OLD)) {
	280	update->have_old = 0;
	281	} else {
2f577360	282	hashcpy(update->new_sha1, update->old_sha1);
3afcc463 MH	283	update->have_old = 1;
3afcc463 MH	284	}
c750ba95	285
e23d8435	286	if (*next != line_termination)
ed410e61	287	die("verify %s has extra input: %s", update->ref_name, next);
e23d8435 MH	288
e23d8435 MH	289	return next;
c750ba95 BK	290	}
c750ba95 BK	291
e23d8435	292	static const char parse_cmd_option(struct strbuf input, const char *next)
c750ba95	293	{
e23d8435	294	if (!strncmp(next, "no-deref", 8) && next[8] == line_termination)
c750ba95 BK	295	update_flags \|= REF_NODEREF;
	296	else
	297	die("option unknown: %s", next);
e23d8435	298	return next + 8;
c750ba95 BK	299	}
	300
	301	static void update_refs_stdin(void)
	302	{
e23d8435 MH	303	struct strbuf input = STRBUF_INIT;
e23d8435 MH	304	const char *next;
c750ba95	305
e23d8435 MH	306	if (strbuf_read(&input, 0, 1000) < 0)
	307	die_errno("could not read from stdin");
	308	next = input.buf;
c750ba95	309	/* Read each line dispatch its command */
e23d8435 MH	310	while (next < input.buf + input.len) {
e23d8435 MH	311	if (*next == line_termination)
c750ba95	312	die("empty command in input");
e23d8435 MH	313	else if (isspace(*next))
	314	die("whitespace before command: %s", next);
	315	else if (starts_with(next, "update "))
	316	next = parse_cmd_update(&input, next + 7);
	317	else if (starts_with(next, "create "))
	318	next = parse_cmd_create(&input, next + 7);
	319	else if (starts_with(next, "delete "))
	320	next = parse_cmd_delete(&input, next + 7);
	321	else if (starts_with(next, "verify "))
	322	next = parse_cmd_verify(&input, next + 7);
	323	else if (starts_with(next, "option "))
	324	next = parse_cmd_option(&input, next + 7);
c750ba95	325	else
e23d8435 MH	326	die("unknown command: %s", next);
	327
	328	next++;
	329	}
c750ba95	330
e23d8435	331	strbuf_release(&input);
c750ba95 BK	332	}
c750ba95 BK	333
a633fca0	334	int cmd_update_ref(int argc, const char *argv, const char prefix)
66bf85a4	335	{
f877fd82	336	const char refname, oldval, *msg = NULL;
5b16b090	337	unsigned char sha1[20], oldsha1[20];
c750ba95	338	int delete = 0, no_deref = 0, read_stdin = 0, end_null = 0, flags = 0;
89942be6	339	struct option options[] = {
82269505	340	OPT_STRING( 'm', NULL, &msg, N_("reason"), N_("reason of the update")),
d5d09d47 SB	341	OPT_BOOL('d', NULL, &delete, N_("delete the reference")),
d5d09d47 SB	342	OPT_BOOL( 0 , "no-deref", &no_deref,
82269505	343	N_("update <refname> not the one it points to")),
9a86b899 JH	344	OPT_BOOL('z', NULL, &end_null, N_("stdin has NUL-terminated arguments")),
9a86b899 JH	345	OPT_BOOL( 0 , "stdin", &read_stdin, N_("read updates from stdin")),
89942be6 PH	346	OPT_END(),
89942be6 PH	347	};
66bf85a4	348
ef90d6d4	349	git_config(git_default_config, NULL);
37782920 SB	350	argc = parse_options(argc, argv, prefix, options, git_update_ref_usage,
37782920 SB	351	0);
89942be6 PH	352	if (msg && !*msg)
89942be6 PH	353	die("Refusing to perform update with empty message.");
5b16b090	354
c750ba95 BK	355	if (read_stdin) {
	356	if (delete \|\| no_deref \|\| argc > 0)
	357	usage_with_options(git_update_ref_usage, options);
	358	if (end_null)
	359	line_termination = '\0';
	360	update_refs_stdin();
f4124112 MH	361	return update_refs(msg, updates, updates_count,
f4124112 MH	362	UPDATE_REFS_DIE_ON_ERR);
c750ba95 BK	363	}
	364
	365	if (end_null)
	366	usage_with_options(git_update_ref_usage, options);
	367
ac5409e4	368	if (delete) {
3fe8dce6	369	if (argc < 1 \|\| argc > 2)
973a70ea KW	370	usage_with_options(git_update_ref_usage, options);
	371	refname = argv[0];
	372	oldval = argv[1];
	373	} else {
	374	const char *value;
	375	if (argc < 2 \|\| argc > 3)
89942be6	376	usage_with_options(git_update_ref_usage, options);
973a70ea KW	377	refname = argv[0];
	378	value = argv[1];
	379	oldval = argv[2];
	380	if (get_sha1(value, sha1))
	381	die("%s: not a valid SHA1", value);
ac5409e4 JH	382	}
ac5409e4 JH	383
973a70ea	384	hashclr(oldsha1); /* all-zero hash in case oldval is the empty string */
ac5409e4	385	if (oldval && *oldval && get_sha1(oldval, oldsha1))
66bf85a4 LT	386	die("%s: not a valid old SHA1", oldval);
66bf85a4 LT	387
569740bd MV	388	if (no_deref)
569740bd MV	389	flags = REF_NODEREF;
973a70ea	390	if (delete)
569740bd	391	return delete_ref(refname, oldval ? oldsha1 : NULL, flags);
973a70ea KW	392	else
973a70ea KW	393	return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
f4124112	394	flags, UPDATE_REFS_DIE_ON_ERR);
66bf85a4	395	}