[thirdparty/git.git] / transport-helper.c

#include "cache.h"
#include "transport.h"
#include "quote.h"
#include "run-command.h"
#include "commit.h"
#include "diff.h"
#include "revision.h"
#include "quote.h"

struct helper_data
{
	const char *name;
	struct child_process *helper;
	FILE *out;
	unsigned fetch : 1,
		option : 1,
		push : 1;
};

static struct child_process *get_helper(struct transport *transport)
{
	struct helper_data *data = transport->data;
	struct strbuf buf = STRBUF_INIT;
	struct child_process *helper;

	if (data->helper)
		return data->helper;

	helper = xcalloc(1, sizeof(*helper));
	helper->in = -1;
	helper->out = -1;
	helper->err = 0;
	helper->argv = xcalloc(4, sizeof(*helper->argv));
	strbuf_addf(&buf, "remote-%s", data->name);
	helper->argv[0] = strbuf_detach(&buf, NULL);
	helper->argv[1] = transport->remote->name;
	helper->argv[2] = transport->url;
	helper->git_cmd = 1;
	if (start_command(helper))
		die("Unable to run helper: git %s", helper->argv[0]);
	data->helper = helper;

	write_str_in_full(helper->in, "capabilities\n");

	data->out = xfdopen(helper->out, "r");
	while (1) {
		if (strbuf_getline(&buf, data->out, '\n') == EOF)
			exit(128); /* child died, message supplied already */

		if (!*buf.buf)
			break;
		if (!strcmp(buf.buf, "fetch"))
			data->fetch = 1;
		if (!strcmp(buf.buf, "option"))
			data->option = 1;
		if (!strcmp(buf.buf, "push"))
			data->push = 1;
	}
	return data->helper;
}

static int disconnect_helper(struct transport *transport)
{
	struct helper_data *data = transport->data;
	if (data->helper) {
		write_str_in_full(data->helper->in, "\n");
		close(data->helper->in);
		fclose(data->out);
		finish_command(data->helper);
		free((char *)data->helper->argv[0]);
		free(data->helper->argv);
		free(data->helper);
		data->helper = NULL;
	}
	free(data);
	return 0;
}

static const char *unsupported_options[] = {
	TRANS_OPT_UPLOADPACK,
	TRANS_OPT_RECEIVEPACK,
	TRANS_OPT_THIN,
	TRANS_OPT_KEEP
	};
static const char *boolean_options[] = {
	TRANS_OPT_THIN,
	TRANS_OPT_KEEP,
	TRANS_OPT_FOLLOWTAGS
	};

static int set_helper_option(struct transport *transport,
			  const char *name, const char *value)
{
	struct helper_data *data = transport->data;
	struct child_process *helper = get_helper(transport);
	struct strbuf buf = STRBUF_INIT;
	int i, ret, is_bool = 0;

	if (!data->option)
		return 1;

	for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
		if (!strcmp(name, unsupported_options[i]))
			return 1;
	}

	for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
		if (!strcmp(name, boolean_options[i])) {
			is_bool = 1;
			break;
		}
	}

	strbuf_addf(&buf, "option %s ", name);
	if (is_bool)
		strbuf_addstr(&buf, value ? "true" : "false");
	else
		quote_c_style(value, &buf, NULL, 0);
	strbuf_addch(&buf, '\n');

	if (write_in_full(helper->in, buf.buf, buf.len) != buf.len)
		die_errno("cannot send option to %s", data->name);

	strbuf_reset(&buf);
	if (strbuf_getline(&buf, data->out, '\n') == EOF)
		exit(128); /* child died, message supplied already */

	if (!strcmp(buf.buf, "ok"))
		ret = 0;
	else if (!prefixcmp(buf.buf, "error")) {
		ret = -1;
	} else if (!strcmp(buf.buf, "unsupported"))
		ret = 1;
	else {
		warning("%s unexpectedly said: '%s'", data->name, buf.buf);
		ret = 1;
	}
	strbuf_release(&buf);
	return ret;
}

static void standard_options(struct transport *t)
{
	char buf[16];
	int n;
	int v = t->verbose;
	int no_progress = v < 0 || (!t->progress && !isatty(1));

	set_helper_option(t, "progress", !no_progress ? "true" : "false");

	n = snprintf(buf, sizeof(buf), "%d", v + 1);
	if (n >= sizeof(buf))
		die("impossibly large verbosity value");
	set_helper_option(t, "verbosity", buf);
}

static int fetch_with_fetch(struct transport *transport,
			    int nr_heads, const struct ref **to_fetch)
{
	struct helper_data *data = transport->data;
	int i;
	struct strbuf buf = STRBUF_INIT;

	standard_options(transport);

	for (i = 0; i < nr_heads; i++) {
		const struct ref *posn = to_fetch[i];
		if (posn->status & REF_STATUS_UPTODATE)
			continue;

		strbuf_addf(&buf, "fetch %s %s\n",
			    sha1_to_hex(posn->old_sha1), posn->name);
	}

	strbuf_addch(&buf, '\n');
	if (write_in_full(data->helper->in, buf.buf, buf.len) != buf.len)
		die_errno("cannot send fetch to %s", data->name);

	while (1) {
		strbuf_reset(&buf);
		if (strbuf_getline(&buf, data->out, '\n') == EOF)
			exit(128); /* child died, message supplied already */

		if (!prefixcmp(buf.buf, "lock ")) {
			const char *name = buf.buf + 5;
			if (transport->pack_lockfile)
				warning("%s also locked %s", data->name, name);
			else
				transport->pack_lockfile = xstrdup(name);
		}
		else if (!buf.len)
			break;
		else
			warning("%s unexpectedly said: '%s'", data->name, buf.buf);
	}
	strbuf_release(&buf);
	return 0;
}

static int fetch(struct transport *transport,
		 int nr_heads, const struct ref **to_fetch)
{
	struct helper_data *data = transport->data;
	int i, count;

	count = 0;
	for (i = 0; i < nr_heads; i++)
		if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
			count++;

	if (!count)
		return 0;

	if (data->fetch)
		return fetch_with_fetch(transport, nr_heads, to_fetch);

	return -1;
}

static int push_refs(struct transport *transport,
		struct ref *remote_refs, int flags)
{
	int force_all = flags & TRANSPORT_PUSH_FORCE;
	int mirror = flags & TRANSPORT_PUSH_MIRROR;
	struct helper_data *data = transport->data;
	struct strbuf buf = STRBUF_INIT;
	struct child_process *helper;
	struct ref *ref;

	if (!remote_refs)
		return 0;

	helper = get_helper(transport);
	if (!data->push)
		return 1;

	for (ref = remote_refs; ref; ref = ref->next) {
		if (ref->peer_ref)
			hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
		else if (!mirror)
			continue;

		ref->deletion = is_null_sha1(ref->new_sha1);
		if (!ref->deletion &&
			!hashcmp(ref->old_sha1, ref->new_sha1)) {
			ref->status = REF_STATUS_UPTODATE;
			continue;
		}

		if (force_all)
			ref->force = 1;

		strbuf_addstr(&buf, "push ");
		if (!ref->deletion) {
			if (ref->force)
				strbuf_addch(&buf, '+');
			if (ref->peer_ref)
				strbuf_addstr(&buf, ref->peer_ref->name);
			else
				strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
		}
		strbuf_addch(&buf, ':');
		strbuf_addstr(&buf, ref->name);
		strbuf_addch(&buf, '\n');
	}

	transport->verbose = flags & TRANSPORT_PUSH_VERBOSE ? 1 : 0;
	standard_options(transport);

	if (flags & TRANSPORT_PUSH_DRY_RUN) {
		if (set_helper_option(transport, "dry-run", "true") != 0)
			die("helper %s does not support dry-run", data->name);
	}

	strbuf_addch(&buf, '\n');
	if (write_in_full(helper->in, buf.buf, buf.len) != buf.len)
		exit(128);

	ref = remote_refs;
	while (1) {
		char *refname, *msg;
		int status;

		strbuf_reset(&buf);
		if (strbuf_getline(&buf, data->out, '\n') == EOF)
			exit(128); /* child died, message supplied already */
		if (!buf.len)
			break;

		if (!prefixcmp(buf.buf, "ok ")) {
			status = REF_STATUS_OK;
			refname = buf.buf + 3;
		} else if (!prefixcmp(buf.buf, "error ")) {
			status = REF_STATUS_REMOTE_REJECT;
			refname = buf.buf + 6;
		} else
			die("expected ok/error, helper said '%s'\n", buf.buf);

		msg = strchr(refname, ' ');
		if (msg) {
			struct strbuf msg_buf = STRBUF_INIT;
			const char *end;

			*msg++ = '\0';
			if (!unquote_c_style(&msg_buf, msg, &end))
				msg = strbuf_detach(&msg_buf, NULL);
			else
				msg = xstrdup(msg);
			strbuf_release(&msg_buf);

			if (!strcmp(msg, "no match")) {
				status = REF_STATUS_NONE;
				free(msg);
				msg = NULL;
			}
			else if (!strcmp(msg, "up to date")) {
				status = REF_STATUS_UPTODATE;
				free(msg);
				msg = NULL;
			}
			else if (!strcmp(msg, "non-fast forward")) {
				status = REF_STATUS_REJECT_NONFASTFORWARD;
				free(msg);
				msg = NULL;
			}
		}

		if (ref)
			ref = find_ref_by_name(ref, refname);
		if (!ref)
			ref = find_ref_by_name(remote_refs, refname);
		if (!ref) {
			warning("helper reported unexpected status of %s", refname);
			continue;
		}

		ref->status = status;
		ref->remote_status = msg;
	}
	strbuf_release(&buf);
	return 0;
}

static struct ref *get_refs_list(struct transport *transport, int for_push)
{
	struct helper_data *data = transport->data;
	struct child_process *helper;
	struct ref *ret = NULL;
	struct ref **tail = &ret;
	struct ref *posn;
	struct strbuf buf = STRBUF_INIT;

	helper = get_helper(transport);

	if (data->push && for_push)
		write_str_in_full(helper->in, "list for-push\n");
	else
		write_str_in_full(helper->in, "list\n");

	while (1) {
		char *eov, *eon;
		if (strbuf_getline(&buf, data->out, '\n') == EOF)
			exit(128); /* child died, message supplied already */

		if (!*buf.buf)
			break;

		eov = strchr(buf.buf, ' ');
		if (!eov)
			die("Malformed response in ref list: %s", buf.buf);
		eon = strchr(eov + 1, ' ');
		*eov = '\0';
		if (eon)
			*eon = '\0';
		*tail = alloc_ref(eov + 1);
		if (buf.buf[0] == '@')
			(*tail)->symref = xstrdup(buf.buf + 1);
		else if (buf.buf[0] != '?')
			get_sha1_hex(buf.buf, (*tail)->old_sha1);
		tail = &((*tail)->next);
	}
	strbuf_release(&buf);

	for (posn = ret; posn; posn = posn->next)
		resolve_remote_symref(posn, ret);

	return ret;
}

int transport_helper_init(struct transport *transport, const char *name)
{
	struct helper_data *data = xcalloc(sizeof(*data), 1);
	data->name = name;

	transport->data = data;
	transport->set_option = set_helper_option;
	transport->get_refs_list = get_refs_list;
	transport->fetch = fetch;
	transport->push_refs = push_refs;
	transport->disconnect = disconnect_helper;
	return 0;
}
Commit	Line	Data
6eb996b5 DB	1	#include "cache.h"
6eb996b5 DB	2	#include "transport.h"
ae4efe19	3	#include "quote.h"
6eb996b5 DB	4	#include "run-command.h"
	5	#include "commit.h"
	6	#include "diff.h"
	7	#include "revision.h"
ef08ef9e	8	#include "quote.h"
6eb996b5 DB	9
	10	struct helper_data
	11	{
	12	const char *name;
	13	struct child_process *helper;
292ce46b	14	FILE *out;
ef08ef9e	15	unsigned fetch : 1,
ae4efe19 SP	16	option : 1,
ae4efe19 SP	17	push : 1;
6eb996b5 DB	18	};
	19
	20	static struct child_process get_helper(struct transport transport)
	21	{
	22	struct helper_data *data = transport->data;
	23	struct strbuf buf = STRBUF_INIT;
	24	struct child_process *helper;
6eb996b5 DB	25
	26	if (data->helper)
	27	return data->helper;
	28
	29	helper = xcalloc(1, sizeof(*helper));
	30	helper->in = -1;
	31	helper->out = -1;
	32	helper->err = 0;
	33	helper->argv = xcalloc(4, sizeof(*helper->argv));
	34	strbuf_addf(&buf, "remote-%s", data->name);
	35	helper->argv[0] = strbuf_detach(&buf, NULL);
	36	helper->argv[1] = transport->remote->name;
	37	helper->argv[2] = transport->url;
	38	helper->git_cmd = 1;
	39	if (start_command(helper))
	40	die("Unable to run helper: git %s", helper->argv[0]);
	41	data->helper = helper;
	42
3d913526	43	write_str_in_full(helper->in, "capabilities\n");
2d14d65c	44
292ce46b	45	data->out = xfdopen(helper->out, "r");
6eb996b5	46	while (1) {
292ce46b	47	if (strbuf_getline(&buf, data->out, '\n') == EOF)
6eb996b5 DB	48	exit(128); /* child died, message supplied already */
	49
	50	if (!*buf.buf)
	51	break;
	52	if (!strcmp(buf.buf, "fetch"))
	53	data->fetch = 1;
ef08ef9e SP	54	if (!strcmp(buf.buf, "option"))
ef08ef9e SP	55	data->option = 1;
ae4efe19 SP	56	if (!strcmp(buf.buf, "push"))
ae4efe19 SP	57	data->push = 1;
6eb996b5 DB	58	}
	59	return data->helper;
	60	}
	61
	62	static int disconnect_helper(struct transport *transport)
	63	{
	64	struct helper_data *data = transport->data;
	65	if (data->helper) {
3d913526	66	write_str_in_full(data->helper->in, "\n");
6eb996b5	67	close(data->helper->in);
292ce46b	68	fclose(data->out);
6eb996b5 DB	69	finish_command(data->helper);
	70	free((char *)data->helper->argv[0]);
	71	free(data->helper->argv);
	72	free(data->helper);
	73	data->helper = NULL;
	74	}
ef08ef9e	75	free(data);
6eb996b5 DB	76	return 0;
	77	}
	78
ef08ef9e SP	79	static const char *unsupported_options[] = {
	80	TRANS_OPT_UPLOADPACK,
	81	TRANS_OPT_RECEIVEPACK,
	82	TRANS_OPT_THIN,
	83	TRANS_OPT_KEEP
	84	};
	85	static const char *boolean_options[] = {
	86	TRANS_OPT_THIN,
	87	TRANS_OPT_KEEP,
	88	TRANS_OPT_FOLLOWTAGS
	89	};
	90
	91	static int set_helper_option(struct transport *transport,
	92	const char name, const char value)
	93	{
	94	struct helper_data *data = transport->data;
	95	struct child_process *helper = get_helper(transport);
	96	struct strbuf buf = STRBUF_INIT;
	97	int i, ret, is_bool = 0;
	98
	99	if (!data->option)
	100	return 1;
	101
	102	for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
	103	if (!strcmp(name, unsupported_options[i]))
	104	return 1;
	105	}
	106
	107	for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
	108	if (!strcmp(name, boolean_options[i])) {
	109	is_bool = 1;
	110	break;
	111	}
	112	}
	113
	114	strbuf_addf(&buf, "option %s ", name);
	115	if (is_bool)
	116	strbuf_addstr(&buf, value ? "true" : "false");
	117	else
	118	quote_c_style(value, &buf, NULL, 0);
	119	strbuf_addch(&buf, '\n');
	120
	121	if (write_in_full(helper->in, buf.buf, buf.len) != buf.len)
	122	die_errno("cannot send option to %s", data->name);
	123
	124	strbuf_reset(&buf);
	125	if (strbuf_getline(&buf, data->out, '\n') == EOF)
	126	exit(128); /* child died, message supplied already */
	127
	128	if (!strcmp(buf.buf, "ok"))
	129	ret = 0;
	130	else if (!prefixcmp(buf.buf, "error")) {
	131	ret = -1;
	132	} else if (!strcmp(buf.buf, "unsupported"))
	133	ret = 1;
	134	else {
	135	warning("%s unexpectedly said: '%s'", data->name, buf.buf);
	136	ret = 1;
	137	}
	138	strbuf_release(&buf);
	139	return ret;
	140	}
	141
	142	static void standard_options(struct transport *t)
143	{
144	char buf[16];
145	int n;
146	int v = t->verbose;
147	int no_progress = v < 0 \|\| (!t->progress && !isatty(1));
148
149	set_helper_option(t, "progress", !no_progress ? "true" : "false");
150
151	n = snprintf(buf, sizeof(buf), "%d", v + 1);
152	if (n >= sizeof(buf))
153	die("impossibly large verbosity value");
154	set_helper_option(t, "verbosity", buf);
155	}
156
6eb996b5 DB	157	static int fetch_with_fetch(struct transport *transport,
	158	int nr_heads, const struct ref **to_fetch)
	159	{
292ce46b	160	struct helper_data *data = transport->data;
6eb996b5 DB	161	int i;
	162	struct strbuf buf = STRBUF_INIT;
	163
ef08ef9e SP	164	standard_options(transport);
ef08ef9e SP	165
6eb996b5	166	for (i = 0; i < nr_heads; i++) {
1088261f	167	const struct ref *posn = to_fetch[i];
6eb996b5 DB	168	if (posn->status & REF_STATUS_UPTODATE)
6eb996b5 DB	169	continue;
2d14d65c DB	170
	171	strbuf_addf(&buf, "fetch %s %s\n",
	172	sha1_to_hex(posn->old_sha1), posn->name);
292ce46b	173	}
2d14d65c	174
292ce46b SP	175	strbuf_addch(&buf, '\n');
	176	if (write_in_full(data->helper->in, buf.buf, buf.len) != buf.len)
	177	die_errno("cannot send fetch to %s", data->name);
	178
	179	while (1) {
	180	strbuf_reset(&buf);
	181	if (strbuf_getline(&buf, data->out, '\n') == EOF)
6eb996b5	182	exit(128); /* child died, message supplied already */
292ce46b SP	183
	184	if (!prefixcmp(buf.buf, "lock ")) {
	185	const char *name = buf.buf + 5;
	186	if (transport->pack_lockfile)
	187	warning("%s also locked %s", data->name, name);
	188	else
	189	transport->pack_lockfile = xstrdup(name);
	190	}
	191	else if (!buf.len)
	192	break;
	193	else
	194	warning("%s unexpectedly said: '%s'", data->name, buf.buf);
6eb996b5	195	}
292ce46b	196	strbuf_release(&buf);
6eb996b5 DB	197	return 0;
	198	}
	199
	200	static int fetch(struct transport *transport,
	201	int nr_heads, const struct ref **to_fetch)
	202	{
	203	struct helper_data *data = transport->data;
	204	int i, count;
	205
	206	count = 0;
	207	for (i = 0; i < nr_heads; i++)
	208	if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
	209	count++;
	210
	211	if (!count)
	212	return 0;
	213
	214	if (data->fetch)
	215	return fetch_with_fetch(transport, nr_heads, to_fetch);
	216
	217	return -1;
	218	}
	219
ae4efe19 SP	220	static int push_refs(struct transport *transport,
	221	struct ref *remote_refs, int flags)
	222	{
	223	int force_all = flags & TRANSPORT_PUSH_FORCE;
	224	int mirror = flags & TRANSPORT_PUSH_MIRROR;
	225	struct helper_data *data = transport->data;
	226	struct strbuf buf = STRBUF_INIT;
	227	struct child_process *helper;
	228	struct ref *ref;
	229
	230	if (!remote_refs)
	231	return 0;
	232
	233	helper = get_helper(transport);
	234	if (!data->push)
	235	return 1;
	236
	237	for (ref = remote_refs; ref; ref = ref->next) {
	238	if (ref->peer_ref)
	239	hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
	240	else if (!mirror)
	241	continue;
	242
	243	ref->deletion = is_null_sha1(ref->new_sha1);
	244	if (!ref->deletion &&
	245	!hashcmp(ref->old_sha1, ref->new_sha1)) {
	246	ref->status = REF_STATUS_UPTODATE;
	247	continue;
	248	}
	249
	250	if (force_all)
	251	ref->force = 1;
	252
	253	strbuf_addstr(&buf, "push ");
	254	if (!ref->deletion) {
	255	if (ref->force)
	256	strbuf_addch(&buf, '+');
	257	if (ref->peer_ref)
	258	strbuf_addstr(&buf, ref->peer_ref->name);
	259	else
	260	strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
	261	}
	262	strbuf_addch(&buf, ':');
	263	strbuf_addstr(&buf, ref->name);
	264	strbuf_addch(&buf, '\n');
	265	}
	266
	267	transport->verbose = flags & TRANSPORT_PUSH_VERBOSE ? 1 : 0;
	268	standard_options(transport);
	269
	270	if (flags & TRANSPORT_PUSH_DRY_RUN) {
	271	if (set_helper_option(transport, "dry-run", "true") != 0)
	272	die("helper %s does not support dry-run", data->name);
	273	}
	274
	275	strbuf_addch(&buf, '\n');
	276	if (write_in_full(helper->in, buf.buf, buf.len) != buf.len)
	277	exit(128);
	278
	279	ref = remote_refs;
	280	while (1) {
	281	char refname, msg;
	282	int status;
	283
284	strbuf_reset(&buf);
285	if (strbuf_getline(&buf, data->out, '\n') == EOF)
286	exit(128); /* child died, message supplied already */
287	if (!buf.len)
288	break;
289
290	if (!prefixcmp(buf.buf, "ok ")) {
291	status = REF_STATUS_OK;
292	refname = buf.buf + 3;
293	} else if (!prefixcmp(buf.buf, "error ")) {
294	status = REF_STATUS_REMOTE_REJECT;
295	refname = buf.buf + 6;
296	} else
297	die("expected ok/error, helper said '%s'\n", buf.buf);
298
299	msg = strchr(refname, ' ');
300	if (msg) {
301	struct strbuf msg_buf = STRBUF_INIT;
302	const char *end;
303
304	*msg++ = '\0';
305	if (!unquote_c_style(&msg_buf, msg, &end))
306	msg = strbuf_detach(&msg_buf, NULL);
307	else
308	msg = xstrdup(msg);
309	strbuf_release(&msg_buf);
310
311	if (!strcmp(msg, "no match")) {
312	status = REF_STATUS_NONE;
313	free(msg);
314	msg = NULL;
315	}
316	else if (!strcmp(msg, "up to date")) {
317	status = REF_STATUS_UPTODATE;
318	free(msg);
319	msg = NULL;
320	}
321	else if (!strcmp(msg, "non-fast forward")) {
322	status = REF_STATUS_REJECT_NONFASTFORWARD;
323	free(msg);
324	msg = NULL;
325	}
326	}
327
328	if (ref)
329	ref = find_ref_by_name(ref, refname);
330	if (!ref)
331	ref = find_ref_by_name(remote_refs, refname);
332	if (!ref) {
333	warning("helper reported unexpected status of %s", refname);
334	continue;
335	}
336
337	ref->status = status;
338	ref->remote_status = msg;
339	}
340	strbuf_release(&buf);
341	return 0;
342	}
343
6eb996b5 DB	344	static struct ref get_refs_list(struct transport transport, int for_push)
6eb996b5 DB	345	{
292ce46b	346	struct helper_data *data = transport->data;
6eb996b5 DB	347	struct child_process *helper;
	348	struct ref *ret = NULL;
	349	struct ref **tail = &ret;
	350	struct ref *posn;
	351	struct strbuf buf = STRBUF_INIT;
6eb996b5 DB	352
6eb996b5 DB	353	helper = get_helper(transport);
2d14d65c	354
ae4efe19 SP	355	if (data->push && for_push)
	356	write_str_in_full(helper->in, "list for-push\n");
	357	else
	358	write_str_in_full(helper->in, "list\n");
6eb996b5	359
6eb996b5 DB	360	while (1) {
6eb996b5 DB	361	char eov, eon;
292ce46b	362	if (strbuf_getline(&buf, data->out, '\n') == EOF)
6eb996b5 DB	363	exit(128); /* child died, message supplied already */
	364
	365	if (!*buf.buf)
	366	break;
	367
	368	eov = strchr(buf.buf, ' ');
	369	if (!eov)
	370	die("Malformed response in ref list: %s", buf.buf);
	371	eon = strchr(eov + 1, ' ');
	372	*eov = '\0';
	373	if (eon)
	374	*eon = '\0';
	375	*tail = alloc_ref(eov + 1);
	376	if (buf.buf[0] == '@')
	377	(*tail)->symref = xstrdup(buf.buf + 1);
	378	else if (buf.buf[0] != '?')
	379	get_sha1_hex(buf.buf, (*tail)->old_sha1);
	380	tail = &((*tail)->next);
	381	}
	382	strbuf_release(&buf);
	383
	384	for (posn = ret; posn; posn = posn->next)
	385	resolve_remote_symref(posn, ret);
	386
	387	return ret;
	388	}
	389
c9e388bb	390	int transport_helper_init(struct transport transport, const char name)
6eb996b5 DB	391	{
6eb996b5 DB	392	struct helper_data data = xcalloc(sizeof(data), 1);
c9e388bb	393	data->name = name;
6eb996b5 DB	394
6eb996b5 DB	395	transport->data = data;
ef08ef9e	396	transport->set_option = set_helper_option;
6eb996b5 DB	397	transport->get_refs_list = get_refs_list;
6eb996b5 DB	398	transport->fetch = fetch;
ae4efe19	399	transport->push_refs = push_refs;
6eb996b5 DB	400	transport->disconnect = disconnect_helper;
	401	return 0;
	402	}