[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 const 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;
}

static void update_store_ref_name(struct ref_update *update,
				  const char *ref_name)
{
	if (check_refname_format(ref_name, REFNAME_ALLOW_ONELEVEL))
		die("invalid ref format: %s", ref_name);
	update->ref_name = xstrdup(ref_name);
}

static void update_store_new_sha1(struct ref_update *update,
				  const char *newvalue)
{
	if (*newvalue && get_sha1(newvalue, update->new_sha1))
		die("invalid new value for ref %s: %s",
		    update->ref_name, newvalue);
}

static void update_store_old_sha1(struct ref_update *update,
				  const char *oldvalue)
{
	if (*oldvalue && get_sha1(oldvalue, update->old_sha1))
		die("invalid old value for ref %s: %s",
		    update->ref_name, oldvalue);

	/* We have an old value if non-empty, or if empty without -z */
	update->have_old = *oldvalue || line_termination;
}

static const char *parse_arg(const char *next, struct strbuf *arg)
{
	/* Parse SP-terminated, possibly C-quoted argument */
	if (*next != '"')
		while (*next && !isspace(*next))
			strbuf_addch(arg, *next++);
	else if (unquote_c_style(arg, next, &next))
		die("badly quoted argument: %s", next);

	/* Return position after the argument */
	return next;
}

static const char *parse_first_arg(const char *next, struct strbuf *arg)
{
	/* Parse argument immediately after "command SP" */
	strbuf_reset(arg);
	if (line_termination) {
		/* Without -z, use the next argument */
		next = parse_arg(next, arg);
	} else {
		/* With -z, use rest of first NUL-terminated line */
		strbuf_addstr(arg, next);
		next = next + arg->len;
	}
	return next;
}

static const char *parse_next_arg(const char *next, struct strbuf *arg)
{
	/* Parse next SP-terminated or NUL-terminated argument, if any */
	strbuf_reset(arg);
	if (line_termination) {
		/* Without -z, consume SP and use next argument */
		if (!*next)
			return NULL;
		if (*next != ' ')
			die("expected SP but got: %s", next);
		next = parse_arg(next + 1, arg);
	} else {
		/* With -z, read the next NUL-terminated line */
		if (*next)
			die("expected NUL but got: %s", next);
		if (strbuf_getline(arg, stdin, '\0') == EOF)
			return NULL;
		next = arg->buf + arg->len;
	}
	return next;
}

static void parse_cmd_update(const char *next)
{
	struct strbuf ref = STRBUF_INIT;
	struct strbuf newvalue = STRBUF_INIT;
	struct strbuf oldvalue = STRBUF_INIT;
	struct ref_update *update;

	update = update_alloc();

	if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
		update_store_ref_name(update, ref.buf);
	else
		die("update line missing <ref>");

	if ((next = parse_next_arg(next, &newvalue)) != NULL)
		update_store_new_sha1(update, newvalue.buf);
	else
		die("update %s missing <newvalue>", ref.buf);

	if ((next = parse_next_arg(next, &oldvalue)) != NULL)
		update_store_old_sha1(update, oldvalue.buf);
	else if(!line_termination)
		die("update %s missing [<oldvalue>] NUL", ref.buf);

	if (next && *next)
		die("update %s has extra input: %s", ref.buf, next);
}

static void parse_cmd_create(const char *next)
{
	struct strbuf ref = STRBUF_INIT;
	struct strbuf newvalue = STRBUF_INIT;
	struct ref_update *update;

	update = update_alloc();

	if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
		update_store_ref_name(update, ref.buf);
	else
		die("create line missing <ref>");

	if ((next = parse_next_arg(next, &newvalue)) != NULL)
		update_store_new_sha1(update, newvalue.buf);
	else
		die("create %s missing <newvalue>", ref.buf);
	if (is_null_sha1(update->new_sha1))
		die("create %s given zero new value", ref.buf);

	if (next && *next)
		die("create %s has extra input: %s", ref.buf, next);
}

static void parse_cmd_delete(const char *next)
{
	struct strbuf ref = STRBUF_INIT;
	struct strbuf oldvalue = STRBUF_INIT;
	struct ref_update *update;

	update = update_alloc();

	if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
		update_store_ref_name(update, ref.buf);
	else
		die("delete line missing <ref>");

	if ((next = parse_next_arg(next, &oldvalue)) != NULL)
		update_store_old_sha1(update, oldvalue.buf);
	else if(!line_termination)
		die("delete %s missing [<oldvalue>] NUL", ref.buf);
	if (update->have_old && is_null_sha1(update->old_sha1))
		die("delete %s given zero old value", ref.buf);

	if (next && *next)
		die("delete %s has extra input: %s", ref.buf, next);
}

static void parse_cmd_verify(const char *next)
{
	struct strbuf ref = STRBUF_INIT;
	struct strbuf value = STRBUF_INIT;
	struct ref_update *update;

	update = update_alloc();

	if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
		update_store_ref_name(update, ref.buf);
	else
		die("verify line missing <ref>");

	if ((next = parse_next_arg(next, &value)) != NULL) {
		update_store_old_sha1(update, value.buf);
		update_store_new_sha1(update, value.buf);
	} else if(!line_termination)
		die("verify %s missing [<oldvalue>] NUL", ref.buf);

	if (next && *next)
		die("verify %s has extra input: %s", ref.buf, next);
}

static void parse_cmd_option(const char *next)
{
	if (!strcmp(next, "no-deref"))
		update_flags |= REF_NODEREF;
	else
		die("option unknown: %s", next);
}

static void update_refs_stdin(void)
{
	struct strbuf cmd = STRBUF_INIT;

	/* Read each line dispatch its command */
	while (strbuf_getline(&cmd, stdin, line_termination) != EOF)
		if (!cmd.buf[0])
			die("empty command in input");
		else if (isspace(*cmd.buf))
			die("whitespace before command: %s", cmd.buf);
		else if (!prefixcmp(cmd.buf, "update "))
			parse_cmd_update(cmd.buf + 7);
		else if (!prefixcmp(cmd.buf, "create "))
			parse_cmd_create(cmd.buf + 7);
		else if (!prefixcmp(cmd.buf, "delete "))
			parse_cmd_delete(cmd.buf + 7);
		else if (!prefixcmp(cmd.buf, "verify "))
			parse_cmd_verify(cmd.buf + 7);
		else if (!prefixcmp(cmd.buf, "option "))
			parse_cmd_option(cmd.buf + 7);
		else
			die("unknown command: %s", cmd.buf);

	strbuf_release(&cmd);
}

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, 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, 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;
	16	static int updates_count;
	17	static const struct ref_update **updates;
	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
	38	static void update_store_ref_name(struct ref_update *update,
	39	const char *ref_name)
	40	{
	41	if (check_refname_format(ref_name, REFNAME_ALLOW_ONELEVEL))
	42	die("invalid ref format: %s", ref_name);
	43	update->ref_name = xstrdup(ref_name);
	44	}
	45
	46	static void update_store_new_sha1(struct ref_update *update,
	47	const char *newvalue)
	48	{
	49	if (*newvalue && get_sha1(newvalue, update->new_sha1))
	50	die("invalid new value for ref %s: %s",
	51	update->ref_name, newvalue);
	52	}
	53
	54	static void update_store_old_sha1(struct ref_update *update,
	55	const char *oldvalue)
	56	{
	57	if (*oldvalue && get_sha1(oldvalue, update->old_sha1))
	58	die("invalid old value for ref %s: %s",
	59	update->ref_name, oldvalue);
	60
	61	/* We have an old value if non-empty, or if empty without -z */
	62	update->have_old = *oldvalue \|\| line_termination;
	63	}
	64
	65	static const char parse_arg(const char next, struct strbuf *arg)
	66	{
	67	/* Parse SP-terminated, possibly C-quoted argument */
	68	if (*next != '"')
	69	while (next && !isspace(next))
	70	strbuf_addch(arg, *next++);
	71	else if (unquote_c_style(arg, next, &next))
	72	die("badly quoted argument: %s", next);
	73
	74	/* Return position after the argument */
	75	return next;
	76	}
	77
	78	static const char parse_first_arg(const char next, struct strbuf *arg)
79	{
80	/* Parse argument immediately after "command SP" */
81	strbuf_reset(arg);
82	if (line_termination) {
83	/* Without -z, use the next argument */
84	next = parse_arg(next, arg);
85	} else {
86	/* With -z, use rest of first NUL-terminated line */
87	strbuf_addstr(arg, next);
88	next = next + arg->len;
89	}
90	return next;
91	}
92
93	static const char parse_next_arg(const char next, struct strbuf *arg)
94	{
95	/* Parse next SP-terminated or NUL-terminated argument, if any */
96	strbuf_reset(arg);
97	if (line_termination) {
98	/* Without -z, consume SP and use next argument */
99	if (!*next)
100	return NULL;
101	if (*next != ' ')
102	die("expected SP but got: %s", next);
103	next = parse_arg(next + 1, arg);
104	} else {
105	/* With -z, read the next NUL-terminated line */
106	if (*next)
107	die("expected NUL but got: %s", next);
108	if (strbuf_getline(arg, stdin, '\0') == EOF)
109	return NULL;
110	next = arg->buf + arg->len;
111	}
112	return next;
113	}
114
115	static void parse_cmd_update(const char *next)
116	{
117	struct strbuf ref = STRBUF_INIT;
118	struct strbuf newvalue = STRBUF_INIT;
119	struct strbuf oldvalue = STRBUF_INIT;
120	struct ref_update *update;
121
122	update = update_alloc();
123
124	if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
125	update_store_ref_name(update, ref.buf);
126	else
127	die("update line missing <ref>");
128
129	if ((next = parse_next_arg(next, &newvalue)) != NULL)
130	update_store_new_sha1(update, newvalue.buf);
131	else
132	die("update %s missing <newvalue>", ref.buf);
133
134	if ((next = parse_next_arg(next, &oldvalue)) != NULL)
135	update_store_old_sha1(update, oldvalue.buf);
136	else if(!line_termination)
137	die("update %s missing [<oldvalue>] NUL", ref.buf);
138
139	if (next && *next)
140	die("update %s has extra input: %s", ref.buf, next);
141	}
142
143	static void parse_cmd_create(const char *next)
144	{
145	struct strbuf ref = STRBUF_INIT;
146	struct strbuf newvalue = STRBUF_INIT;
147	struct ref_update *update;
148
149	update = update_alloc();
150
151	if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
152	update_store_ref_name(update, ref.buf);
153	else
154	die("create line missing <ref>");
155
156	if ((next = parse_next_arg(next, &newvalue)) != NULL)
157	update_store_new_sha1(update, newvalue.buf);
158	else
159	die("create %s missing <newvalue>", ref.buf);
160	if (is_null_sha1(update->new_sha1))
161	die("create %s given zero new value", ref.buf);
162
163	if (next && *next)
164	die("create %s has extra input: %s", ref.buf, next);
165	}
166
167	static void parse_cmd_delete(const char *next)
168	{
169	struct strbuf ref = STRBUF_INIT;
170	struct strbuf oldvalue = STRBUF_INIT;
171	struct ref_update *update;
172
173	update = update_alloc();
174
175	if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
176	update_store_ref_name(update, ref.buf);
177	else
178	die("delete line missing <ref>");
179
180	if ((next = parse_next_arg(next, &oldvalue)) != NULL)
181	update_store_old_sha1(update, oldvalue.buf);
182	else if(!line_termination)
183	die("delete %s missing [<oldvalue>] NUL", ref.buf);
184	if (update->have_old && is_null_sha1(update->old_sha1))
185	die("delete %s given zero old value", ref.buf);
186
187	if (next && *next)
188	die("delete %s has extra input: %s", ref.buf, next);
189	}
190
191	static void parse_cmd_verify(const char *next)
192	{
193	struct strbuf ref = STRBUF_INIT;
194	struct strbuf value = STRBUF_INIT;
195	struct ref_update *update;
196
197	update = update_alloc();
198
199	if ((next = parse_first_arg(next, &ref)) != NULL && ref.buf[0])
200	update_store_ref_name(update, ref.buf);
201	else
202	die("verify line missing <ref>");
203
204	if ((next = parse_next_arg(next, &value)) != NULL) {
205	update_store_old_sha1(update, value.buf);
206	update_store_new_sha1(update, value.buf);
207	} else if(!line_termination)
208	die("verify %s missing [<oldvalue>] NUL", ref.buf);
209
210	if (next && *next)
211	die("verify %s has extra input: %s", ref.buf, next);
212	}
213
214	static void parse_cmd_option(const char *next)
215	{
216	if (!strcmp(next, "no-deref"))
217	update_flags \|= REF_NODEREF;
218	else
219	die("option unknown: %s", next);
220	}
221
222	static void update_refs_stdin(void)
223	{
224	struct strbuf cmd = STRBUF_INIT;
225
226	/* Read each line dispatch its command */
227	while (strbuf_getline(&cmd, stdin, line_termination) != EOF)
228	if (!cmd.buf[0])
229	die("empty command in input");
230	else if (isspace(*cmd.buf))
231	die("whitespace before command: %s", cmd.buf);
232	else if (!prefixcmp(cmd.buf, "update "))
233	parse_cmd_update(cmd.buf + 7);
234	else if (!prefixcmp(cmd.buf, "create "))
235	parse_cmd_create(cmd.buf + 7);
236	else if (!prefixcmp(cmd.buf, "delete "))
237	parse_cmd_delete(cmd.buf + 7);
238	else if (!prefixcmp(cmd.buf, "verify "))
239	parse_cmd_verify(cmd.buf + 7);
240	else if (!prefixcmp(cmd.buf, "option "))
241	parse_cmd_option(cmd.buf + 7);
242	else
243	die("unknown command: %s", cmd.buf);
244
245	strbuf_release(&cmd);
246	}
247
a633fca0	248	int cmd_update_ref(int argc, const char *argv, const char prefix)
66bf85a4	249	{
f877fd82	250	const char refname, oldval, *msg = NULL;
5b16b090	251	unsigned char sha1[20], oldsha1[20];
c750ba95	252	int delete = 0, no_deref = 0, read_stdin = 0, end_null = 0, flags = 0;
89942be6	253	struct option options[] = {
82269505	254	OPT_STRING( 'm', NULL, &msg, N_("reason"), N_("reason of the update")),
d5d09d47 SB	255	OPT_BOOL('d', NULL, &delete, N_("delete the reference")),
d5d09d47 SB	256	OPT_BOOL( 0 , "no-deref", &no_deref,
82269505	257	N_("update <refname> not the one it points to")),
9a86b899 JH	258	OPT_BOOL('z', NULL, &end_null, N_("stdin has NUL-terminated arguments")),
9a86b899 JH	259	OPT_BOOL( 0 , "stdin", &read_stdin, N_("read updates from stdin")),
89942be6 PH	260	OPT_END(),
89942be6 PH	261	};
66bf85a4	262
ef90d6d4	263	git_config(git_default_config, NULL);
37782920 SB	264	argc = parse_options(argc, argv, prefix, options, git_update_ref_usage,
37782920 SB	265	0);
89942be6 PH	266	if (msg && !*msg)
89942be6 PH	267	die("Refusing to perform update with empty message.");
5b16b090	268
c750ba95 BK	269	if (read_stdin) {
	270	if (delete \|\| no_deref \|\| argc > 0)
	271	usage_with_options(git_update_ref_usage, options);
	272	if (end_null)
	273	line_termination = '\0';
	274	update_refs_stdin();
	275	return update_refs(msg, updates, updates_count, DIE_ON_ERR);
	276	}
	277
	278	if (end_null)
	279	usage_with_options(git_update_ref_usage, options);
	280
ac5409e4	281	if (delete) {
3fe8dce6	282	if (argc < 1 \|\| argc > 2)
973a70ea KW	283	usage_with_options(git_update_ref_usage, options);
	284	refname = argv[0];
	285	oldval = argv[1];
	286	} else {
	287	const char *value;
	288	if (argc < 2 \|\| argc > 3)
89942be6	289	usage_with_options(git_update_ref_usage, options);
973a70ea KW	290	refname = argv[0];
	291	value = argv[1];
	292	oldval = argv[2];
	293	if (get_sha1(value, sha1))
	294	die("%s: not a valid SHA1", value);
ac5409e4 JH	295	}
ac5409e4 JH	296
973a70ea	297	hashclr(oldsha1); /* all-zero hash in case oldval is the empty string */
ac5409e4	298	if (oldval && *oldval && get_sha1(oldval, oldsha1))
66bf85a4 LT	299	die("%s: not a valid old SHA1", oldval);
66bf85a4 LT	300
569740bd MV	301	if (no_deref)
569740bd MV	302	flags = REF_NODEREF;
973a70ea	303	if (delete)
569740bd	304	return delete_ref(refname, oldval ? oldsha1 : NULL, flags);
973a70ea KW	305	else
973a70ea KW	306	return update_ref(msg, refname, sha1, oldval ? oldsha1 : NULL,
569740bd	307	flags, DIE_ON_ERR);
66bf85a4	308	}