[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"
#include "remote.h"

static int debug;

struct helper_data
{
	const char *name;
	struct child_process *helper;
	FILE *out;
	unsigned fetch : 1,
		import : 1,
		option : 1,
		push : 1;
	/* These go from remote name (as in "list") to private name */
	struct refspec *refspecs;
	int refspec_nr;
};

static void sendline(struct helper_data *helper, struct strbuf *buffer)
{
	if (debug)
		fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
	if (write_in_full(helper->helper->in, buffer->buf, buffer->len)
		!= buffer->len)
		die_errno("Full write to remote helper failed");
}

static int recvline(struct helper_data *helper, struct strbuf *buffer)
{
	strbuf_reset(buffer);
	if (debug)
		fprintf(stderr, "Debug: Remote helper: Waiting...\n");
	if (strbuf_getline(buffer, helper->out, '\n') == EOF) {
		if (debug)
			fprintf(stderr, "Debug: Remote helper quit.\n");
		exit(128);
	}

	if (debug)
		fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
	return 0;
}

static void xchgline(struct helper_data *helper, struct strbuf *buffer)
{
	sendline(helper, buffer);
	recvline(helper, buffer);
}

static void write_constant(int fd, const char *str)
{
	if (debug)
		fprintf(stderr, "Debug: Remote helper: -> %s", str);
	if (write_in_full(fd, str, strlen(str)) != strlen(str))
		die_errno("Full write to remote helper failed");
}

const char *remove_ext_force(const char *url)
{
	if (url) {
		const char *colon = strchr(url, ':');
		if (colon && colon[1] == ':')
			return colon + 2;
	}
	return url;
}

static struct child_process *get_helper(struct transport *transport)
{
	struct helper_data *data = transport->data;
	struct strbuf buf = STRBUF_INIT;
	struct child_process *helper;
	const char **refspecs = NULL;
	int refspec_nr = 0;
	int refspec_alloc = 0;

	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] = remove_ext_force(transport->url);
	helper->git_cmd = 1;
	if (start_command(helper))
		die("Unable to run helper: git %s", helper->argv[0]);
	data->helper = helper;

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

	data->out = xfdopen(helper->out, "r");
	while (1) {
		const char *capname;
		int mandatory = 0;
		recvline(data, &buf);

		if (!*buf.buf)
			break;

		if (*buf.buf == '*') {
			capname = buf.buf + 1;
			mandatory = 1;
		} else
			capname = buf.buf;

		if (debug)
			fprintf(stderr, "Debug: Got cap %s\n", capname);
		if (!strcmp(capname, "fetch"))
			data->fetch = 1;
		else if (!strcmp(capname, "option"))
			data->option = 1;
		else if (!strcmp(capname, "push"))
			data->push = 1;
		else if (!strcmp(capname, "import"))
			data->import = 1;
		else if (!data->refspecs && !prefixcmp(capname, "refspec ")) {
			ALLOC_GROW(refspecs,
				   refspec_nr + 1,
				   refspec_alloc);
			refspecs[refspec_nr++] = strdup(buf.buf + strlen("refspec "));
		} else if (mandatory) {
			die("Unknown madatory capability %s. This remote "
			    "helper probably needs newer version of Git.\n",
			    capname);
		}
	}
	if (refspecs) {
		int i;
		data->refspec_nr = refspec_nr;
		data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
		for (i = 0; i < refspec_nr; i++) {
			free((char *)refspecs[i]);
		}
		free(refspecs);
	}
	strbuf_release(&buf);
	if (debug)
		fprintf(stderr, "Debug: Capabilities complete.\n");
	return data->helper;
}

static int disconnect_helper(struct transport *transport)
{
	struct helper_data *data = transport->data;
	struct strbuf buf = STRBUF_INIT;

	if (data->helper) {
		if (debug)
			fprintf(stderr, "Debug: Disconnecting.\n");
		strbuf_addf(&buf, "\n");
		sendline(data, &buf);
		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;
	}
	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 strbuf buf = STRBUF_INIT;
	int i, ret, is_bool = 0;

	get_helper(transport);

	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');

	xchgline(data, &buf);

	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 release_helper(struct transport *transport)
{
	struct helper_data *data = transport->data;
	free_refspec(data->refspec_nr, data->refspecs);
	data->refspecs = NULL;
	disconnect_helper(transport);
	free(transport->data);
	return 0;
}

static int fetch_with_fetch(struct transport *transport,
			    int nr_heads, 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');
	sendline(data, &buf);

	while (1) {
		recvline(data, &buf);

		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 get_importer(struct transport *transport, struct child_process *fastimport)
{
	struct child_process *helper = get_helper(transport);
	memset(fastimport, 0, sizeof(*fastimport));
	fastimport->in = helper->out;
	fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
	fastimport->argv[0] = "fast-import";
	fastimport->argv[1] = "--quiet";

	fastimport->git_cmd = 1;
	return start_command(fastimport);
}

static int fetch_with_import(struct transport *transport,
			     int nr_heads, struct ref **to_fetch)
{
	struct child_process fastimport;
	struct helper_data *data = transport->data;
	int i;
	struct ref *posn;
	struct strbuf buf = STRBUF_INIT;

	get_helper(transport);

	if (get_importer(transport, &fastimport))
		die("Couldn't run fast-import");

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

		strbuf_addf(&buf, "import %s\n", posn->name);
		sendline(data, &buf);
		strbuf_reset(&buf);
	}
	disconnect_helper(transport);
	finish_command(&fastimport);
	free(fastimport.argv);
	fastimport.argv = NULL;

	for (i = 0; i < nr_heads; i++) {
		char *private;
		posn = to_fetch[i];
		if (posn->status & REF_STATUS_UPTODATE)
			continue;
		if (data->refspecs)
			private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
		else
			private = strdup(posn->name);
		read_ref(private, posn->old_sha1);
		free(private);
	}
	strbuf_release(&buf);
	return 0;
}

static int fetch(struct transport *transport,
		 int nr_heads, 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);

	if (data->import)
		return fetch_with_import(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');
	}
	if (buf.len == 0)
		return 0;

	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');
	sendline(data, &buf);

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

		recvline(data, &buf);
		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 int has_attribute(const char *attrs, const char *attr) {
	int len;
	if (!attrs)
		return 0;

	len = strlen(attr);
	for (;;) {
		const char *space = strchrnul(attrs, ' ');
		if (len == space - attrs && !strncmp(attrs, attr, len))
			return 1;
		if (!*space)
			return 0;
		attrs = space + 1;
	}
}

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;
		recvline(data, &buf);

		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);
		if (eon) {
			if (has_attribute(eon + 1, "unchanged")) {
				(*tail)->status |= REF_STATUS_UPTODATE;
				read_ref((*tail)->name, (*tail)->old_sha1);
			}
		}
		tail = &((*tail)->next);
	}
	if (debug)
		fprintf(stderr, "Debug: Read ref listing.\n");
	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;

	if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
		debug = 1;

	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 = release_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"
72ff8943	9	#include "remote.h"
6eb996b5	10
bf3c523c IL	11	static int debug;
bf3c523c IL	12
6eb996b5 DB	13	struct helper_data
	14	{
	15	const char *name;
	16	struct child_process *helper;
292ce46b	17	FILE *out;
ef08ef9e	18	unsigned fetch : 1,
a24a32dd	19	import : 1,
ae4efe19 SP	20	option : 1,
ae4efe19 SP	21	push : 1;
72ff8943 DB	22	/* These go from remote name (as in "list") to private name */
	23	struct refspec *refspecs;
	24	int refspec_nr;
6eb996b5 DB	25	};
6eb996b5 DB	26
bf3c523c IL	27	static void sendline(struct helper_data helper, struct strbuf buffer)
	28	{
	29	if (debug)
	30	fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
	31	if (write_in_full(helper->helper->in, buffer->buf, buffer->len)
	32	!= buffer->len)
	33	die_errno("Full write to remote helper failed");
	34	}
	35
	36	static int recvline(struct helper_data helper, struct strbuf buffer)
	37	{
	38	strbuf_reset(buffer);
	39	if (debug)
	40	fprintf(stderr, "Debug: Remote helper: Waiting...\n");
	41	if (strbuf_getline(buffer, helper->out, '\n') == EOF) {
	42	if (debug)
	43	fprintf(stderr, "Debug: Remote helper quit.\n");
	44	exit(128);
	45	}
	46
	47	if (debug)
	48	fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
	49	return 0;
	50	}
	51
	52	static void xchgline(struct helper_data helper, struct strbuf buffer)
	53	{
	54	sendline(helper, buffer);
	55	recvline(helper, buffer);
	56	}
	57
	58	static void write_constant(int fd, const char *str)
	59	{
	60	if (debug)
	61	fprintf(stderr, "Debug: Remote helper: -> %s", str);
	62	if (write_in_full(fd, str, strlen(str)) != strlen(str))
	63	die_errno("Full write to remote helper failed");
	64	}
	65
25d5cc48 IL	66	const char remove_ext_force(const char url)
	67	{
	68	if (url) {
	69	const char *colon = strchr(url, ':');
	70	if (colon && colon[1] == ':')
	71	return colon + 2;
	72	}
	73	return url;
	74	}
	75
6eb996b5 DB	76	static struct child_process get_helper(struct transport transport)
	77	{
	78	struct helper_data *data = transport->data;
	79	struct strbuf buf = STRBUF_INIT;
	80	struct child_process *helper;
72ff8943 DB	81	const char **refspecs = NULL;
	82	int refspec_nr = 0;
	83	int refspec_alloc = 0;
6eb996b5 DB	84
	85	if (data->helper)
	86	return data->helper;
	87
	88	helper = xcalloc(1, sizeof(*helper));
	89	helper->in = -1;
	90	helper->out = -1;
	91	helper->err = 0;
	92	helper->argv = xcalloc(4, sizeof(*helper->argv));
	93	strbuf_addf(&buf, "remote-%s", data->name);
	94	helper->argv[0] = strbuf_detach(&buf, NULL);
	95	helper->argv[1] = transport->remote->name;
25d5cc48	96	helper->argv[2] = remove_ext_force(transport->url);
6eb996b5 DB	97	helper->git_cmd = 1;
	98	if (start_command(helper))
	99	die("Unable to run helper: git %s", helper->argv[0]);
	100	data->helper = helper;
	101
bf3c523c	102	write_constant(helper->in, "capabilities\n");
2d14d65c	103
292ce46b	104	data->out = xfdopen(helper->out, "r");
6eb996b5	105	while (1) {
28ed5b35 IL	106	const char *capname;
28ed5b35 IL	107	int mandatory = 0;
bf3c523c	108	recvline(data, &buf);
6eb996b5 DB	109
	110	if (!*buf.buf)
	111	break;
28ed5b35 IL	112
	113	if (buf.buf == '') {
	114	capname = buf.buf + 1;
	115	mandatory = 1;
	116	} else
	117	capname = buf.buf;
	118
bf3c523c	119	if (debug)
28ed5b35 IL	120	fprintf(stderr, "Debug: Got cap %s\n", capname);
28ed5b35 IL	121	if (!strcmp(capname, "fetch"))
6eb996b5	122	data->fetch = 1;
28ed5b35	123	else if (!strcmp(capname, "option"))
ef08ef9e	124	data->option = 1;
28ed5b35	125	else if (!strcmp(capname, "push"))
ae4efe19	126	data->push = 1;
28ed5b35	127	else if (!strcmp(capname, "import"))
e65e91ed	128	data->import = 1;
28ed5b35	129	else if (!data->refspecs && !prefixcmp(capname, "refspec ")) {
72ff8943 DB	130	ALLOC_GROW(refspecs,
	131	refspec_nr + 1,
	132	refspec_alloc);
	133	refspecs[refspec_nr++] = strdup(buf.buf + strlen("refspec "));
28ed5b35 IL	134	} else if (mandatory) {
	135	die("Unknown madatory capability %s. This remote "
	136	"helper probably needs newer version of Git.\n",
	137	capname);
72ff8943 DB	138	}
	139	}
	140	if (refspecs) {
	141	int i;
	142	data->refspec_nr = refspec_nr;
	143	data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
	144	for (i = 0; i < refspec_nr; i++) {
	145	free((char *)refspecs[i]);
	146	}
	147	free(refspecs);
6eb996b5	148	}
b962dbdc	149	strbuf_release(&buf);
bf3c523c IL	150	if (debug)
bf3c523c IL	151	fprintf(stderr, "Debug: Capabilities complete.\n");
6eb996b5 DB	152	return data->helper;
	153	}
	154
	155	static int disconnect_helper(struct transport *transport)
	156	{
	157	struct helper_data *data = transport->data;
bf3c523c IL	158	struct strbuf buf = STRBUF_INIT;
bf3c523c IL	159
6eb996b5	160	if (data->helper) {
bf3c523c IL	161	if (debug)
	162	fprintf(stderr, "Debug: Disconnecting.\n");
	163	strbuf_addf(&buf, "\n");
	164	sendline(data, &buf);
6eb996b5	165	close(data->helper->in);
292ce46b	166	fclose(data->out);
6eb996b5 DB	167	finish_command(data->helper);
	168	free((char *)data->helper->argv[0]);
	169	free(data->helper->argv);
	170	free(data->helper);
	171	data->helper = NULL;
	172	}
	173	return 0;
	174	}
	175
ef08ef9e SP	176	static const char *unsupported_options[] = {
	177	TRANS_OPT_UPLOADPACK,
	178	TRANS_OPT_RECEIVEPACK,
	179	TRANS_OPT_THIN,
	180	TRANS_OPT_KEEP
	181	};
	182	static const char *boolean_options[] = {
	183	TRANS_OPT_THIN,
	184	TRANS_OPT_KEEP,
	185	TRANS_OPT_FOLLOWTAGS
	186	};
	187
	188	static int set_helper_option(struct transport *transport,
	189	const char name, const char value)
	190	{
	191	struct helper_data *data = transport->data;
ef08ef9e SP	192	struct strbuf buf = STRBUF_INIT;
	193	int i, ret, is_bool = 0;
	194
bf3c523c IL	195	get_helper(transport);
bf3c523c IL	196
ef08ef9e SP	197	if (!data->option)
	198	return 1;
	199
	200	for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
	201	if (!strcmp(name, unsupported_options[i]))
	202	return 1;
	203	}
	204
	205	for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
	206	if (!strcmp(name, boolean_options[i])) {
	207	is_bool = 1;
	208	break;
	209	}
	210	}
	211
	212	strbuf_addf(&buf, "option %s ", name);
	213	if (is_bool)
	214	strbuf_addstr(&buf, value ? "true" : "false");
	215	else
	216	quote_c_style(value, &buf, NULL, 0);
	217	strbuf_addch(&buf, '\n');
	218
bf3c523c	219	xchgline(data, &buf);
ef08ef9e SP	220
	221	if (!strcmp(buf.buf, "ok"))
	222	ret = 0;
	223	else if (!prefixcmp(buf.buf, "error")) {
	224	ret = -1;
	225	} else if (!strcmp(buf.buf, "unsupported"))
	226	ret = 1;
	227	else {
	228	warning("%s unexpectedly said: '%s'", data->name, buf.buf);
	229	ret = 1;
	230	}
	231	strbuf_release(&buf);
	232	return ret;
	233	}
	234
	235	static void standard_options(struct transport *t)
	236	{
	237	char buf[16];
	238	int n;
	239	int v = t->verbose;
	240	int no_progress = v < 0 \|\| (!t->progress && !isatty(1));
	241
	242	set_helper_option(t, "progress", !no_progress ? "true" : "false");
	243
	244	n = snprintf(buf, sizeof(buf), "%d", v + 1);
	245	if (n >= sizeof(buf))
	246	die("impossibly large verbosity value");
	247	set_helper_option(t, "verbosity", buf);
	248	}
	249
f2a37151 DB	250	static int release_helper(struct transport *transport)
f2a37151 DB	251	{
72ff8943 DB	252	struct helper_data *data = transport->data;
	253	free_refspec(data->refspec_nr, data->refspecs);
	254	data->refspecs = NULL;
f2a37151 DB	255	disconnect_helper(transport);
	256	free(transport->data);
	257	return 0;
	258	}
	259
6eb996b5	260	static int fetch_with_fetch(struct transport *transport,
37148311	261	int nr_heads, struct ref **to_fetch)
6eb996b5	262	{
292ce46b	263	struct helper_data *data = transport->data;
6eb996b5 DB	264	int i;
	265	struct strbuf buf = STRBUF_INIT;
	266
ef08ef9e SP	267	standard_options(transport);
ef08ef9e SP	268
6eb996b5	269	for (i = 0; i < nr_heads; i++) {
1088261f	270	const struct ref *posn = to_fetch[i];
6eb996b5 DB	271	if (posn->status & REF_STATUS_UPTODATE)
6eb996b5 DB	272	continue;
2d14d65c DB	273
	274	strbuf_addf(&buf, "fetch %s %s\n",
	275	sha1_to_hex(posn->old_sha1), posn->name);
292ce46b	276	}
2d14d65c	277
292ce46b	278	strbuf_addch(&buf, '\n');
bf3c523c	279	sendline(data, &buf);
292ce46b SP	280
292ce46b SP	281	while (1) {
bf3c523c	282	recvline(data, &buf);
292ce46b SP	283
	284	if (!prefixcmp(buf.buf, "lock ")) {
	285	const char *name = buf.buf + 5;
	286	if (transport->pack_lockfile)
	287	warning("%s also locked %s", data->name, name);
	288	else
	289	transport->pack_lockfile = xstrdup(name);
	290	}
	291	else if (!buf.len)
	292	break;
	293	else
	294	warning("%s unexpectedly said: '%s'", data->name, buf.buf);
6eb996b5	295	}
292ce46b	296	strbuf_release(&buf);
6eb996b5 DB	297	return 0;
	298	}
	299
e65e91ed DB	300	static int get_importer(struct transport transport, struct child_process fastimport)
	301	{
	302	struct child_process *helper = get_helper(transport);
	303	memset(fastimport, 0, sizeof(*fastimport));
	304	fastimport->in = helper->out;
	305	fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
	306	fastimport->argv[0] = "fast-import";
	307	fastimport->argv[1] = "--quiet";
	308
	309	fastimport->git_cmd = 1;
	310	return start_command(fastimport);
	311	}
	312
	313	static int fetch_with_import(struct transport *transport,
	314	int nr_heads, struct ref **to_fetch)
	315	{
	316	struct child_process fastimport;
72ff8943	317	struct helper_data *data = transport->data;
e65e91ed DB	318	int i;
	319	struct ref *posn;
	320	struct strbuf buf = STRBUF_INIT;
	321
bf3c523c IL	322	get_helper(transport);
bf3c523c IL	323
e65e91ed DB	324	if (get_importer(transport, &fastimport))
	325	die("Couldn't run fast-import");
	326
	327	for (i = 0; i < nr_heads; i++) {
	328	posn = to_fetch[i];
	329	if (posn->status & REF_STATUS_UPTODATE)
	330	continue;
	331
	332	strbuf_addf(&buf, "import %s\n", posn->name);
bf3c523c	333	sendline(data, &buf);
e65e91ed DB	334	strbuf_reset(&buf);
	335	}
	336	disconnect_helper(transport);
	337	finish_command(&fastimport);
b962dbdc SR	338	free(fastimport.argv);
b962dbdc SR	339	fastimport.argv = NULL;
e65e91ed DB	340
e65e91ed DB	341	for (i = 0; i < nr_heads; i++) {
72ff8943	342	char *private;
e65e91ed DB	343	posn = to_fetch[i];
	344	if (posn->status & REF_STATUS_UPTODATE)
	345	continue;
72ff8943 DB	346	if (data->refspecs)
	347	private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
	348	else
	349	private = strdup(posn->name);
	350	read_ref(private, posn->old_sha1);
	351	free(private);
e65e91ed	352	}
b962dbdc	353	strbuf_release(&buf);
e65e91ed DB	354	return 0;
	355	}
	356
6eb996b5	357	static int fetch(struct transport *transport,
37148311	358	int nr_heads, struct ref **to_fetch)
6eb996b5 DB	359	{
	360	struct helper_data *data = transport->data;
	361	int i, count;
	362
	363	count = 0;
	364	for (i = 0; i < nr_heads; i++)
	365	if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
	366	count++;
	367
	368	if (!count)
	369	return 0;
	370
	371	if (data->fetch)
	372	return fetch_with_fetch(transport, nr_heads, to_fetch);
	373
e65e91ed DB	374	if (data->import)
	375	return fetch_with_import(transport, nr_heads, to_fetch);
	376
6eb996b5 DB	377	return -1;
	378	}
	379
ae4efe19 SP	380	static int push_refs(struct transport *transport,
	381	struct ref *remote_refs, int flags)
	382	{
	383	int force_all = flags & TRANSPORT_PUSH_FORCE;
	384	int mirror = flags & TRANSPORT_PUSH_MIRROR;
	385	struct helper_data *data = transport->data;
	386	struct strbuf buf = STRBUF_INIT;
	387	struct child_process *helper;
	388	struct ref *ref;
	389
	390	if (!remote_refs)
	391	return 0;
	392
	393	helper = get_helper(transport);
	394	if (!data->push)
	395	return 1;
	396
	397	for (ref = remote_refs; ref; ref = ref->next) {
	398	if (ref->peer_ref)
	399	hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
	400	else if (!mirror)
	401	continue;
	402
	403	ref->deletion = is_null_sha1(ref->new_sha1);
	404	if (!ref->deletion &&
	405	!hashcmp(ref->old_sha1, ref->new_sha1)) {
	406	ref->status = REF_STATUS_UPTODATE;
	407	continue;
	408	}
	409
	410	if (force_all)
	411	ref->force = 1;
	412
	413	strbuf_addstr(&buf, "push ");
	414	if (!ref->deletion) {
	415	if (ref->force)
	416	strbuf_addch(&buf, '+');
	417	if (ref->peer_ref)
	418	strbuf_addstr(&buf, ref->peer_ref->name);
	419	else
	420	strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
	421	}
	422	strbuf_addch(&buf, ':');
	423	strbuf_addstr(&buf, ref->name);
	424	strbuf_addch(&buf, '\n');
	425	}
d8f67d20 CB	426	if (buf.len == 0)
d8f67d20 CB	427	return 0;
ae4efe19 SP	428
	429	transport->verbose = flags & TRANSPORT_PUSH_VERBOSE ? 1 : 0;
	430	standard_options(transport);
	431
	432	if (flags & TRANSPORT_PUSH_DRY_RUN) {
	433	if (set_helper_option(transport, "dry-run", "true") != 0)
	434	die("helper %s does not support dry-run", data->name);
	435	}
	436
	437	strbuf_addch(&buf, '\n');
bf3c523c	438	sendline(data, &buf);
ae4efe19 SP	439
	440	ref = remote_refs;
	441	while (1) {
	442	char refname, msg;
	443	int status;
	444
bf3c523c	445	recvline(data, &buf);
ae4efe19 SP	446	if (!buf.len)
	447	break;
	448
	449	if (!prefixcmp(buf.buf, "ok ")) {
	450	status = REF_STATUS_OK;
	451	refname = buf.buf + 3;
	452	} else if (!prefixcmp(buf.buf, "error ")) {
	453	status = REF_STATUS_REMOTE_REJECT;
	454	refname = buf.buf + 6;
	455	} else
	456	die("expected ok/error, helper said '%s'\n", buf.buf);
	457
	458	msg = strchr(refname, ' ');
	459	if (msg) {
	460	struct strbuf msg_buf = STRBUF_INIT;
	461	const char *end;
	462
	463	*msg++ = '\0';
	464	if (!unquote_c_style(&msg_buf, msg, &end))
	465	msg = strbuf_detach(&msg_buf, NULL);
	466	else
	467	msg = xstrdup(msg);
	468	strbuf_release(&msg_buf);
	469
	470	if (!strcmp(msg, "no match")) {
	471	status = REF_STATUS_NONE;
	472	free(msg);
	473	msg = NULL;
	474	}
	475	else if (!strcmp(msg, "up to date")) {
	476	status = REF_STATUS_UPTODATE;
	477	free(msg);
	478	msg = NULL;
	479	}
	480	else if (!strcmp(msg, "non-fast forward")) {
	481	status = REF_STATUS_REJECT_NONFASTFORWARD;
	482	free(msg);
	483	msg = NULL;
	484	}
	485	}
	486
	487	if (ref)
	488	ref = find_ref_by_name(ref, refname);
	489	if (!ref)
	490	ref = find_ref_by_name(remote_refs, refname);
	491	if (!ref) {
	492	warning("helper reported unexpected status of %s", refname);
	493	continue;
	494	}
	495
	496	ref->status = status;
	497	ref->remote_status = msg;
	498	}
	499	strbuf_release(&buf);
	500	return 0;
	501	}
	502
f8ec9167 DB	503	static int has_attribute(const char attrs, const char attr) {
	504	int len;
	505	if (!attrs)
	506	return 0;
	507
	508	len = strlen(attr);
	509	for (;;) {
	510	const char *space = strchrnul(attrs, ' ');
	511	if (len == space - attrs && !strncmp(attrs, attr, len))
	512	return 1;
	513	if (!*space)
	514	return 0;
	515	attrs = space + 1;
	516	}
	517	}
	518
6eb996b5 DB	519	static struct ref get_refs_list(struct transport transport, int for_push)
6eb996b5 DB	520	{
292ce46b	521	struct helper_data *data = transport->data;
6eb996b5 DB	522	struct child_process *helper;
	523	struct ref *ret = NULL;
	524	struct ref **tail = &ret;
	525	struct ref *posn;
	526	struct strbuf buf = STRBUF_INIT;
6eb996b5 DB	527
6eb996b5 DB	528	helper = get_helper(transport);
2d14d65c	529
ae4efe19 SP	530	if (data->push && for_push)
	531	write_str_in_full(helper->in, "list for-push\n");
	532	else
	533	write_str_in_full(helper->in, "list\n");
6eb996b5	534
6eb996b5 DB	535	while (1) {
6eb996b5 DB	536	char eov, eon;
bf3c523c	537	recvline(data, &buf);
6eb996b5 DB	538
	539	if (!*buf.buf)
	540	break;
	541
	542	eov = strchr(buf.buf, ' ');
	543	if (!eov)
	544	die("Malformed response in ref list: %s", buf.buf);
	545	eon = strchr(eov + 1, ' ');
	546	*eov = '\0';
	547	if (eon)
	548	*eon = '\0';
	549	*tail = alloc_ref(eov + 1);
	550	if (buf.buf[0] == '@')
	551	(*tail)->symref = xstrdup(buf.buf + 1);
	552	else if (buf.buf[0] != '?')
	553	get_sha1_hex(buf.buf, (*tail)->old_sha1);
f8ec9167 DB	554	if (eon) {
	555	if (has_attribute(eon + 1, "unchanged")) {
	556	(*tail)->status \|= REF_STATUS_UPTODATE;
	557	read_ref((tail)->name, (tail)->old_sha1);
	558	}
	559	}
6eb996b5 DB	560	tail = &((*tail)->next);
6eb996b5 DB	561	}
bf3c523c IL	562	if (debug)
bf3c523c IL	563	fprintf(stderr, "Debug: Read ref listing.\n");
6eb996b5 DB	564	strbuf_release(&buf);
	565
	566	for (posn = ret; posn; posn = posn->next)
	567	resolve_remote_symref(posn, ret);
	568
	569	return ret;
	570	}
	571
c9e388bb	572	int transport_helper_init(struct transport transport, const char name)
6eb996b5 DB	573	{
6eb996b5 DB	574	struct helper_data data = xcalloc(sizeof(data), 1);
c9e388bb	575	data->name = name;
6eb996b5	576
bf3c523c IL	577	if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
	578	debug = 1;
	579
6eb996b5	580	transport->data = data;
ef08ef9e	581	transport->set_option = set_helper_option;
6eb996b5 DB	582	transport->get_refs_list = get_refs_list;
6eb996b5 DB	583	transport->fetch = fetch;
ae4efe19	584	transport->push_refs = push_refs;
f2a37151	585	transport->disconnect = release_helper;
6eb996b5 DB	586	return 0;
6eb996b5 DB	587	}