[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: */
			warning("%s %s: missing <newvalue>, treating as zero",
				command, refname);
			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: */
1fbd5049 MH	157	warning("%s %s: missing <newvalue>, treating as zero",
1fbd5049 MH	158	command, refname);
3afcc463 MH	159	hashclr(sha1);
	160	} else {
	161	/*
	162	* With -z, an empty non-required value means
	163	* unspecified:
	164	*/
	165	ret = 1;
	166	}
c750ba95	167	}
3afcc463 MH	168
	169	strbuf_release(&arg);
	170
	171	return ret;
	172
	173	invalid:
	174	die(flags & PARSE_SHA1_OLD ?
	175	"%s %s: invalid <oldvalue>: %s" :
	176	"%s %s: invalid <newvalue>: %s",
	177	command, refname, arg.buf);
	178
	179	eof:
	180	die(flags & PARSE_SHA1_OLD ?
	181	"%s %s missing <oldvalue>" :
	182	"%s %s missing <newvalue>",
	183	command, refname);
c750ba95 BK	184	}
c750ba95 BK	185
e23d8435 MH	186
	187	/*
	188	* The following five parse_cmd_*() functions parse the corresponding
	189	* command. In each case, next points at the character following the
	190	* command name and the following space. They each return a pointer
	191	* to the character terminating the command, and die with an
	192	* explanatory message if there are any parsing problems. All of
	193	* these functions handle either text or binary format input,
	194	* depending on how line_termination is set.
	195	*/
	196
	197	static const char parse_cmd_update(struct strbuf input, const char *next)
c750ba95	198	{
c750ba95 BK	199	struct ref_update *update;
	200
	201	update = update_alloc();
	202
ed410e61 MH	203	update->ref_name = parse_refname(input, &next);
ed410e61 MH	204	if (!update->ref_name)
c750ba95 BK	205	die("update line missing <ref>");
c750ba95 BK	206
3afcc463 MH	207	if (parse_next_sha1(input, &next, update->new_sha1,
	208	"update", update->ref_name,
	209	PARSE_SHA1_ALLOW_EMPTY))
ed410e61	210	die("update %s missing <newvalue>", update->ref_name);
c750ba95	211
3afcc463 MH	212	update->have_old = !parse_next_sha1(input, &next, update->old_sha1,
	213	"update", update->ref_name,
	214	PARSE_SHA1_OLD);
	215
	216	if (*next != line_termination)
	217	die("update %s has extra input: %s", update->ref_name, next);
c750ba95	218
e23d8435	219	return next;
c750ba95 BK	220	}
c750ba95 BK	221
e23d8435	222	static const char parse_cmd_create(struct strbuf input, const char *next)
c750ba95	223	{
c750ba95 BK	224	struct ref_update *update;
	225
	226	update = update_alloc();
	227
ed410e61 MH	228	update->ref_name = parse_refname(input, &next);
ed410e61 MH	229	if (!update->ref_name)
c750ba95 BK	230	die("create line missing <ref>");
c750ba95 BK	231
3afcc463 MH	232	if (parse_next_sha1(input, &next, update->new_sha1,
3afcc463 MH	233	"create", update->ref_name, 0))
ed410e61	234	die("create %s missing <newvalue>", update->ref_name);
e23d8435	235
c750ba95	236	if (is_null_sha1(update->new_sha1))
9255f059	237	die("create %s given zero <newvalue>", update->ref_name);
c750ba95	238
e23d8435	239	if (*next != line_termination)
ed410e61	240	die("create %s has extra input: %s", update->ref_name, next);
e23d8435 MH	241
e23d8435 MH	242	return next;
c750ba95 BK	243	}
c750ba95 BK	244
e23d8435	245	static const char parse_cmd_delete(struct strbuf input, const char *next)
c750ba95	246	{
c750ba95 BK	247	struct ref_update *update;
	248
	249	update = update_alloc();
	250
ed410e61 MH	251	update->ref_name = parse_refname(input, &next);
ed410e61 MH	252	if (!update->ref_name)
c750ba95 BK	253	die("delete line missing <ref>");
c750ba95 BK	254
3afcc463 MH	255	if (parse_next_sha1(input, &next, update->old_sha1,
	256	"delete", update->ref_name, PARSE_SHA1_OLD)) {
	257	update->have_old = 0;
	258	} else {
	259	if (is_null_sha1(update->old_sha1))
9255f059	260	die("delete %s given zero <oldvalue>", update->ref_name);
3afcc463 MH	261	update->have_old = 1;
3afcc463 MH	262	}
c750ba95	263
e23d8435	264	if (*next != line_termination)
ed410e61	265	die("delete %s has extra input: %s", update->ref_name, next);
e23d8435 MH	266
e23d8435 MH	267	return next;
c750ba95 BK	268	}
c750ba95 BK	269
e23d8435	270	static const char parse_cmd_verify(struct strbuf input, const char *next)
c750ba95	271	{
c750ba95 BK	272	struct ref_update *update;
	273
	274	update = update_alloc();
	275
ed410e61 MH	276	update->ref_name = parse_refname(input, &next);
ed410e61 MH	277	if (!update->ref_name)
c750ba95 BK	278	die("verify line missing <ref>");
c750ba95 BK	279
3afcc463 MH	280	if (parse_next_sha1(input, &next, update->old_sha1,
	281	"verify", update->ref_name, PARSE_SHA1_OLD)) {
	282	update->have_old = 0;
	283	} else {
2f577360	284	hashcpy(update->new_sha1, update->old_sha1);
3afcc463 MH	285	update->have_old = 1;
3afcc463 MH	286	}
c750ba95	287
e23d8435	288	if (*next != line_termination)
ed410e61	289	die("verify %s has extra input: %s", update->ref_name, next);
e23d8435 MH	290
e23d8435 MH	291	return next;
c750ba95 BK	292	}
c750ba95 BK	293
e23d8435	294	static const char parse_cmd_option(struct strbuf input, const char *next)
c750ba95	295	{
e23d8435	296	if (!strncmp(next, "no-deref", 8) && next[8] == line_termination)
c750ba95 BK	297	update_flags \|= REF_NODEREF;
	298	else
	299	die("option unknown: %s", next);
e23d8435	300	return next + 8;
c750ba95 BK	301	}
	302
	303	static void update_refs_stdin(void)
	304	{
e23d8435 MH	305	struct strbuf input = STRBUF_INIT;
e23d8435 MH	306	const char *next;
c750ba95	307
e23d8435 MH	308	if (strbuf_read(&input, 0, 1000) < 0)
	309	die_errno("could not read from stdin");
	310	next = input.buf;
c750ba95	311	/* Read each line dispatch its command */
e23d8435 MH	312	while (next < input.buf + input.len) {
e23d8435 MH	313	if (*next == line_termination)
c750ba95	314	die("empty command in input");
e23d8435 MH	315	else if (isspace(*next))
	316	die("whitespace before command: %s", next);
	317	else if (starts_with(next, "update "))
	318	next = parse_cmd_update(&input, next + 7);
	319	else if (starts_with(next, "create "))
	320	next = parse_cmd_create(&input, next + 7);
	321	else if (starts_with(next, "delete "))
	322	next = parse_cmd_delete(&input, next + 7);
	323	else if (starts_with(next, "verify "))
	324	next = parse_cmd_verify(&input, next + 7);
	325	else if (starts_with(next, "option "))
	326	next = parse_cmd_option(&input, next + 7);
c750ba95	327	else
e23d8435 MH	328	die("unknown command: %s", next);
	329
	330	next++;
	331	}
c750ba95	332
e23d8435	333	strbuf_release(&input);
c750ba95 BK	334	}
c750ba95 BK	335
a633fca0	336	int cmd_update_ref(int argc, const char *argv, const char prefix)
66bf85a4	337	{
f877fd82	338	const char refname, oldval, *msg = NULL;
5b16b090	339	unsigned char sha1[20], oldsha1[20];
c750ba95	340	int delete = 0, no_deref = 0, read_stdin = 0, end_null = 0, flags = 0;
89942be6	341	struct option options[] = {
82269505	342	OPT_STRING( 'm', NULL, &msg, N_("reason"), N_("reason of the update")),
d5d09d47 SB	343	OPT_BOOL('d', NULL, &delete, N_("delete the reference")),
d5d09d47 SB	344	OPT_BOOL( 0 , "no-deref", &no_deref,
82269505	345	N_("update <refname> not the one it points to")),
9a86b899 JH	346	OPT_BOOL('z', NULL, &end_null, N_("stdin has NUL-terminated arguments")),
9a86b899 JH	347	OPT_BOOL( 0 , "stdin", &read_stdin, N_("read updates from stdin")),
89942be6 PH	348	OPT_END(),
89942be6 PH	349	};
66bf85a4	350
ef90d6d4	351	git_config(git_default_config, NULL);
37782920 SB	352	argc = parse_options(argc, argv, prefix, options, git_update_ref_usage,
37782920 SB	353	0);
89942be6 PH	354	if (msg && !*msg)
89942be6 PH	355	die("Refusing to perform update with empty message.");
5b16b090	356
c750ba95 BK	357	if (read_stdin) {
	358	if (delete \|\| no_deref \|\| argc > 0)
	359	usage_with_options(git_update_ref_usage, options);
	360	if (end_null)
	361	line_termination = '\0';
	362	update_refs_stdin();
f4124112 MH	363	return update_refs(msg, updates, updates_count,
f4124112 MH	364	UPDATE_REFS_DIE_ON_ERR);
c750ba95 BK	365	}
	366
	367	if (end_null)
	368	usage_with_options(git_update_ref_usage, options);
	369
ac5409e4	370	if (delete) {
3fe8dce6	371	if (argc < 1 \|\| argc > 2)
973a70ea KW	372	usage_with_options(git_update_ref_usage, options);
	373	refname = argv[0];
	374	oldval = argv[1];
	375	} else {
	376	const char *value;
	377	if (argc < 2 \|\| argc > 3)
89942be6	378	usage_with_options(git_update_ref_usage, options);
973a70ea KW	379	refname = argv[0];
	380	value = argv[1];
	381	oldval = argv[2];
	382	if (get_sha1(value, sha1))
	383	die("%s: not a valid SHA1", value);
ac5409e4 JH	384	}
ac5409e4 JH	385
973a70ea	386	hashclr(oldsha1); /* all-zero hash in case oldval is the empty string */
ac5409e4	387	if (oldval && *oldval && get_sha1(oldval, oldsha1))
66bf85a4 LT	388	die("%s: not a valid old SHA1", oldval);
66bf85a4 LT	389
569740bd MV	390	if (no_deref)
569740bd MV	391	flags = REF_NODEREF;
973a70ea	392	if (delete)
569740bd	393	return delete_ref(refname, oldval ? oldsha1 : NULL, flags);
973a70ea KW	394	else
973a70ea KW	395	return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
f4124112	396	flags, UPDATE_REFS_DIE_ON_ERR);
66bf85a4	397	}