[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;
	/* Transport options for fetch-pack/send-pack (should one of
	 * those be invoked).
	 */
	struct git_transport_options transport_options;
};

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;
	int duped;

	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;

	/*
	 * Open the output as FILE* so strbuf_getline() can be used.
	 * Do this with duped fd because fclose() will close the fd,
	 * and stuff like taking over will require the fd to remain.
	 *
	 */
	duped = dup(helper->out);
	if (duped < 0)
		die_errno("Can't dup helper output fd");
	data->out = xfdopen(duped, "r");

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

	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);
		close(data->helper->out);
		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;
	transport->smart_options = &(data->transport_options);
	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;
61b075bd IL	25	/* Transport options for fetch-pack/send-pack (should one of
	26	* those be invoked).
	27	*/
	28	struct git_transport_options transport_options;
6eb996b5 DB	29	};
6eb996b5 DB	30
bf3c523c IL	31	static void sendline(struct helper_data helper, struct strbuf buffer)
	32	{
	33	if (debug)
	34	fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
	35	if (write_in_full(helper->helper->in, buffer->buf, buffer->len)
	36	!= buffer->len)
	37	die_errno("Full write to remote helper failed");
	38	}
	39
	40	static int recvline(struct helper_data helper, struct strbuf buffer)
	41	{
	42	strbuf_reset(buffer);
	43	if (debug)
	44	fprintf(stderr, "Debug: Remote helper: Waiting...\n");
	45	if (strbuf_getline(buffer, helper->out, '\n') == EOF) {
	46	if (debug)
	47	fprintf(stderr, "Debug: Remote helper quit.\n");
	48	exit(128);
	49	}
	50
	51	if (debug)
	52	fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
	53	return 0;
	54	}
	55
	56	static void xchgline(struct helper_data helper, struct strbuf buffer)
	57	{
	58	sendline(helper, buffer);
	59	recvline(helper, buffer);
	60	}
	61
	62	static void write_constant(int fd, const char *str)
	63	{
	64	if (debug)
	65	fprintf(stderr, "Debug: Remote helper: -> %s", str);
	66	if (write_in_full(fd, str, strlen(str)) != strlen(str))
	67	die_errno("Full write to remote helper failed");
	68	}
	69
25d5cc48 IL	70	const char remove_ext_force(const char url)
	71	{
	72	if (url) {
	73	const char *colon = strchr(url, ':');
	74	if (colon && colon[1] == ':')
	75	return colon + 2;
	76	}
	77	return url;
	78	}
	79
6eb996b5 DB	80	static struct child_process get_helper(struct transport transport)
	81	{
	82	struct helper_data *data = transport->data;
	83	struct strbuf buf = STRBUF_INIT;
	84	struct child_process *helper;
72ff8943 DB	85	const char **refspecs = NULL;
	86	int refspec_nr = 0;
	87	int refspec_alloc = 0;
61b075bd	88	int duped;
6eb996b5 DB	89
	90	if (data->helper)
	91	return data->helper;
	92
	93	helper = xcalloc(1, sizeof(*helper));
	94	helper->in = -1;
	95	helper->out = -1;
	96	helper->err = 0;
	97	helper->argv = xcalloc(4, sizeof(*helper->argv));
	98	strbuf_addf(&buf, "remote-%s", data->name);
	99	helper->argv[0] = strbuf_detach(&buf, NULL);
	100	helper->argv[1] = transport->remote->name;
25d5cc48	101	helper->argv[2] = remove_ext_force(transport->url);
6eb996b5 DB	102	helper->git_cmd = 1;
	103	if (start_command(helper))
	104	die("Unable to run helper: git %s", helper->argv[0]);
	105	data->helper = helper;
	106
61b075bd IL	107	/*
	108	* Open the output as FILE* so strbuf_getline() can be used.
	109	* Do this with duped fd because fclose() will close the fd,
	110	* and stuff like taking over will require the fd to remain.
	111	*
	112	*/
	113	duped = dup(helper->out);
	114	if (duped < 0)
	115	die_errno("Can't dup helper output fd");
	116	data->out = xfdopen(duped, "r");
	117
bf3c523c	118	write_constant(helper->in, "capabilities\n");
2d14d65c	119
6eb996b5	120	while (1) {
28ed5b35 IL	121	const char *capname;
28ed5b35 IL	122	int mandatory = 0;
bf3c523c	123	recvline(data, &buf);
6eb996b5 DB	124
	125	if (!*buf.buf)
	126	break;
28ed5b35 IL	127
	128	if (buf.buf == '') {
	129	capname = buf.buf + 1;
	130	mandatory = 1;
	131	} else
	132	capname = buf.buf;
	133
bf3c523c	134	if (debug)
28ed5b35 IL	135	fprintf(stderr, "Debug: Got cap %s\n", capname);
28ed5b35 IL	136	if (!strcmp(capname, "fetch"))
6eb996b5	137	data->fetch = 1;
28ed5b35	138	else if (!strcmp(capname, "option"))
ef08ef9e	139	data->option = 1;
28ed5b35	140	else if (!strcmp(capname, "push"))
ae4efe19	141	data->push = 1;
28ed5b35	142	else if (!strcmp(capname, "import"))
e65e91ed	143	data->import = 1;
28ed5b35	144	else if (!data->refspecs && !prefixcmp(capname, "refspec ")) {
72ff8943 DB	145	ALLOC_GROW(refspecs,
	146	refspec_nr + 1,
	147	refspec_alloc);
	148	refspecs[refspec_nr++] = strdup(buf.buf + strlen("refspec "));
28ed5b35 IL	149	} else if (mandatory) {
	150	die("Unknown madatory capability %s. This remote "
	151	"helper probably needs newer version of Git.\n",
	152	capname);
72ff8943 DB	153	}
	154	}
	155	if (refspecs) {
	156	int i;
	157	data->refspec_nr = refspec_nr;
	158	data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
	159	for (i = 0; i < refspec_nr; i++) {
	160	free((char *)refspecs[i]);
	161	}
	162	free(refspecs);
6eb996b5	163	}
b962dbdc	164	strbuf_release(&buf);
bf3c523c IL	165	if (debug)
bf3c523c IL	166	fprintf(stderr, "Debug: Capabilities complete.\n");
6eb996b5 DB	167	return data->helper;
	168	}
	169
	170	static int disconnect_helper(struct transport *transport)
	171	{
	172	struct helper_data *data = transport->data;
bf3c523c IL	173	struct strbuf buf = STRBUF_INIT;
bf3c523c IL	174
6eb996b5	175	if (data->helper) {
bf3c523c IL	176	if (debug)
	177	fprintf(stderr, "Debug: Disconnecting.\n");
	178	strbuf_addf(&buf, "\n");
	179	sendline(data, &buf);
6eb996b5	180	close(data->helper->in);
61b075bd	181	close(data->helper->out);
292ce46b	182	fclose(data->out);
6eb996b5 DB	183	finish_command(data->helper);
	184	free((char *)data->helper->argv[0]);
	185	free(data->helper->argv);
	186	free(data->helper);
	187	data->helper = NULL;
	188	}
	189	return 0;
	190	}
	191
ef08ef9e SP	192	static const char *unsupported_options[] = {
	193	TRANS_OPT_UPLOADPACK,
	194	TRANS_OPT_RECEIVEPACK,
	195	TRANS_OPT_THIN,
	196	TRANS_OPT_KEEP
	197	};
	198	static const char *boolean_options[] = {
	199	TRANS_OPT_THIN,
	200	TRANS_OPT_KEEP,
	201	TRANS_OPT_FOLLOWTAGS
	202	};
	203
	204	static int set_helper_option(struct transport *transport,
	205	const char name, const char value)
	206	{
	207	struct helper_data *data = transport->data;
ef08ef9e SP	208	struct strbuf buf = STRBUF_INIT;
	209	int i, ret, is_bool = 0;
	210
bf3c523c IL	211	get_helper(transport);
bf3c523c IL	212
ef08ef9e SP	213	if (!data->option)
	214	return 1;
	215
	216	for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
	217	if (!strcmp(name, unsupported_options[i]))
	218	return 1;
	219	}
	220
	221	for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
	222	if (!strcmp(name, boolean_options[i])) {
	223	is_bool = 1;
	224	break;
	225	}
	226	}
	227
	228	strbuf_addf(&buf, "option %s ", name);
	229	if (is_bool)
	230	strbuf_addstr(&buf, value ? "true" : "false");
	231	else
	232	quote_c_style(value, &buf, NULL, 0);
	233	strbuf_addch(&buf, '\n');
	234
bf3c523c	235	xchgline(data, &buf);
ef08ef9e SP	236
	237	if (!strcmp(buf.buf, "ok"))
	238	ret = 0;
	239	else if (!prefixcmp(buf.buf, "error")) {
	240	ret = -1;
	241	} else if (!strcmp(buf.buf, "unsupported"))
	242	ret = 1;
	243	else {
	244	warning("%s unexpectedly said: '%s'", data->name, buf.buf);
	245	ret = 1;
	246	}
	247	strbuf_release(&buf);
	248	return ret;
	249	}
	250
	251	static void standard_options(struct transport *t)
	252	{
	253	char buf[16];
	254	int n;
	255	int v = t->verbose;
	256	int no_progress = v < 0 \|\| (!t->progress && !isatty(1));
	257
	258	set_helper_option(t, "progress", !no_progress ? "true" : "false");
	259
	260	n = snprintf(buf, sizeof(buf), "%d", v + 1);
	261	if (n >= sizeof(buf))
	262	die("impossibly large verbosity value");
	263	set_helper_option(t, "verbosity", buf);
	264	}
	265
f2a37151 DB	266	static int release_helper(struct transport *transport)
f2a37151 DB	267	{
72ff8943 DB	268	struct helper_data *data = transport->data;
	269	free_refspec(data->refspec_nr, data->refspecs);
	270	data->refspecs = NULL;
f2a37151 DB	271	disconnect_helper(transport);
	272	free(transport->data);
	273	return 0;
	274	}
	275
6eb996b5	276	static int fetch_with_fetch(struct transport *transport,
37148311	277	int nr_heads, struct ref **to_fetch)
6eb996b5	278	{
292ce46b	279	struct helper_data *data = transport->data;
6eb996b5 DB	280	int i;
	281	struct strbuf buf = STRBUF_INIT;
	282
ef08ef9e SP	283	standard_options(transport);
ef08ef9e SP	284
6eb996b5	285	for (i = 0; i < nr_heads; i++) {
1088261f	286	const struct ref *posn = to_fetch[i];
6eb996b5 DB	287	if (posn->status & REF_STATUS_UPTODATE)
6eb996b5 DB	288	continue;
2d14d65c DB	289
	290	strbuf_addf(&buf, "fetch %s %s\n",
	291	sha1_to_hex(posn->old_sha1), posn->name);
292ce46b	292	}
2d14d65c	293
292ce46b	294	strbuf_addch(&buf, '\n');
bf3c523c	295	sendline(data, &buf);
292ce46b SP	296
292ce46b SP	297	while (1) {
bf3c523c	298	recvline(data, &buf);
292ce46b SP	299
	300	if (!prefixcmp(buf.buf, "lock ")) {
	301	const char *name = buf.buf + 5;
	302	if (transport->pack_lockfile)
	303	warning("%s also locked %s", data->name, name);
	304	else
	305	transport->pack_lockfile = xstrdup(name);
	306	}
	307	else if (!buf.len)
	308	break;
	309	else
	310	warning("%s unexpectedly said: '%s'", data->name, buf.buf);
6eb996b5	311	}
292ce46b	312	strbuf_release(&buf);
6eb996b5 DB	313	return 0;
	314	}
	315
e65e91ed DB	316	static int get_importer(struct transport transport, struct child_process fastimport)
	317	{
	318	struct child_process *helper = get_helper(transport);
	319	memset(fastimport, 0, sizeof(*fastimport));
	320	fastimport->in = helper->out;
	321	fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
	322	fastimport->argv[0] = "fast-import";
	323	fastimport->argv[1] = "--quiet";
	324
	325	fastimport->git_cmd = 1;
	326	return start_command(fastimport);
	327	}
	328
	329	static int fetch_with_import(struct transport *transport,
	330	int nr_heads, struct ref **to_fetch)
	331	{
	332	struct child_process fastimport;
72ff8943	333	struct helper_data *data = transport->data;
e65e91ed DB	334	int i;
	335	struct ref *posn;
	336	struct strbuf buf = STRBUF_INIT;
	337
bf3c523c IL	338	get_helper(transport);
bf3c523c IL	339
e65e91ed DB	340	if (get_importer(transport, &fastimport))
	341	die("Couldn't run fast-import");
	342
	343	for (i = 0; i < nr_heads; i++) {
	344	posn = to_fetch[i];
	345	if (posn->status & REF_STATUS_UPTODATE)
	346	continue;
	347
	348	strbuf_addf(&buf, "import %s\n", posn->name);
bf3c523c	349	sendline(data, &buf);
e65e91ed DB	350	strbuf_reset(&buf);
	351	}
	352	disconnect_helper(transport);
	353	finish_command(&fastimport);
b962dbdc SR	354	free(fastimport.argv);
b962dbdc SR	355	fastimport.argv = NULL;
e65e91ed DB	356
e65e91ed DB	357	for (i = 0; i < nr_heads; i++) {
72ff8943	358	char *private;
e65e91ed DB	359	posn = to_fetch[i];
	360	if (posn->status & REF_STATUS_UPTODATE)
	361	continue;
72ff8943 DB	362	if (data->refspecs)
	363	private = apply_refspecs(data->refspecs, data->refspec_nr, posn->name);
	364	else
	365	private = strdup(posn->name);
	366	read_ref(private, posn->old_sha1);
	367	free(private);
e65e91ed	368	}
b962dbdc	369	strbuf_release(&buf);
e65e91ed DB	370	return 0;
	371	}
	372
6eb996b5	373	static int fetch(struct transport *transport,
37148311	374	int nr_heads, struct ref **to_fetch)
6eb996b5 DB	375	{
	376	struct helper_data *data = transport->data;
	377	int i, count;
	378
	379	count = 0;
	380	for (i = 0; i < nr_heads; i++)
	381	if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
	382	count++;
	383
	384	if (!count)
	385	return 0;
	386
	387	if (data->fetch)
	388	return fetch_with_fetch(transport, nr_heads, to_fetch);
	389
e65e91ed DB	390	if (data->import)
	391	return fetch_with_import(transport, nr_heads, to_fetch);
	392
6eb996b5 DB	393	return -1;
	394	}
	395
ae4efe19 SP	396	static int push_refs(struct transport *transport,
	397	struct ref *remote_refs, int flags)
	398	{
	399	int force_all = flags & TRANSPORT_PUSH_FORCE;
	400	int mirror = flags & TRANSPORT_PUSH_MIRROR;
	401	struct helper_data *data = transport->data;
	402	struct strbuf buf = STRBUF_INIT;
	403	struct child_process *helper;
	404	struct ref *ref;
	405
	406	if (!remote_refs)
	407	return 0;
	408
	409	helper = get_helper(transport);
	410	if (!data->push)
	411	return 1;
	412
	413	for (ref = remote_refs; ref; ref = ref->next) {
	414	if (ref->peer_ref)
	415	hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
	416	else if (!mirror)
	417	continue;
	418
	419	ref->deletion = is_null_sha1(ref->new_sha1);
	420	if (!ref->deletion &&
	421	!hashcmp(ref->old_sha1, ref->new_sha1)) {
	422	ref->status = REF_STATUS_UPTODATE;
	423	continue;
	424	}
	425
	426	if (force_all)
	427	ref->force = 1;
	428
	429	strbuf_addstr(&buf, "push ");
	430	if (!ref->deletion) {
	431	if (ref->force)
	432	strbuf_addch(&buf, '+');
	433	if (ref->peer_ref)
	434	strbuf_addstr(&buf, ref->peer_ref->name);
	435	else
	436	strbuf_addstr(&buf, sha1_to_hex(ref->new_sha1));
	437	}
	438	strbuf_addch(&buf, ':');
	439	strbuf_addstr(&buf, ref->name);
	440	strbuf_addch(&buf, '\n');
	441	}
d8f67d20 CB	442	if (buf.len == 0)
d8f67d20 CB	443	return 0;
ae4efe19 SP	444
	445	transport->verbose = flags & TRANSPORT_PUSH_VERBOSE ? 1 : 0;
	446	standard_options(transport);
	447
	448	if (flags & TRANSPORT_PUSH_DRY_RUN) {
	449	if (set_helper_option(transport, "dry-run", "true") != 0)
	450	die("helper %s does not support dry-run", data->name);
	451	}
	452
	453	strbuf_addch(&buf, '\n');
bf3c523c	454	sendline(data, &buf);
ae4efe19 SP	455
	456	ref = remote_refs;
	457	while (1) {
	458	char refname, msg;
	459	int status;
	460
bf3c523c	461	recvline(data, &buf);
ae4efe19 SP	462	if (!buf.len)
	463	break;
	464
	465	if (!prefixcmp(buf.buf, "ok ")) {
	466	status = REF_STATUS_OK;
	467	refname = buf.buf + 3;
	468	} else if (!prefixcmp(buf.buf, "error ")) {
	469	status = REF_STATUS_REMOTE_REJECT;
	470	refname = buf.buf + 6;
	471	} else
	472	die("expected ok/error, helper said '%s'\n", buf.buf);
	473
	474	msg = strchr(refname, ' ');
	475	if (msg) {
	476	struct strbuf msg_buf = STRBUF_INIT;
	477	const char *end;
	478
	479	*msg++ = '\0';
	480	if (!unquote_c_style(&msg_buf, msg, &end))
	481	msg = strbuf_detach(&msg_buf, NULL);
	482	else
	483	msg = xstrdup(msg);
	484	strbuf_release(&msg_buf);
	485
	486	if (!strcmp(msg, "no match")) {
	487	status = REF_STATUS_NONE;
	488	free(msg);
	489	msg = NULL;
	490	}
	491	else if (!strcmp(msg, "up to date")) {
	492	status = REF_STATUS_UPTODATE;
	493	free(msg);
	494	msg = NULL;
	495	}
	496	else if (!strcmp(msg, "non-fast forward")) {
	497	status = REF_STATUS_REJECT_NONFASTFORWARD;
	498	free(msg);
	499	msg = NULL;
	500	}
	501	}
	502
	503	if (ref)
	504	ref = find_ref_by_name(ref, refname);
	505	if (!ref)
	506	ref = find_ref_by_name(remote_refs, refname);
	507	if (!ref) {
	508	warning("helper reported unexpected status of %s", refname);
	509	continue;
	510	}
	511
	512	ref->status = status;
	513	ref->remote_status = msg;
	514	}
	515	strbuf_release(&buf);
	516	return 0;
	517	}
	518
f8ec9167 DB	519	static int has_attribute(const char attrs, const char attr) {
	520	int len;
	521	if (!attrs)
	522	return 0;
	523
	524	len = strlen(attr);
	525	for (;;) {
	526	const char *space = strchrnul(attrs, ' ');
	527	if (len == space - attrs && !strncmp(attrs, attr, len))
	528	return 1;
	529	if (!*space)
	530	return 0;
	531	attrs = space + 1;
	532	}
	533	}
	534
6eb996b5 DB	535	static struct ref get_refs_list(struct transport transport, int for_push)
6eb996b5 DB	536	{
292ce46b	537	struct helper_data *data = transport->data;
6eb996b5 DB	538	struct child_process *helper;
	539	struct ref *ret = NULL;
	540	struct ref **tail = &ret;
	541	struct ref *posn;
	542	struct strbuf buf = STRBUF_INIT;
6eb996b5 DB	543
6eb996b5 DB	544	helper = get_helper(transport);
2d14d65c	545
ae4efe19 SP	546	if (data->push && for_push)
	547	write_str_in_full(helper->in, "list for-push\n");
	548	else
	549	write_str_in_full(helper->in, "list\n");
6eb996b5	550
6eb996b5 DB	551	while (1) {
6eb996b5 DB	552	char eov, eon;
bf3c523c	553	recvline(data, &buf);
6eb996b5 DB	554
	555	if (!*buf.buf)
	556	break;
	557
	558	eov = strchr(buf.buf, ' ');
	559	if (!eov)
	560	die("Malformed response in ref list: %s", buf.buf);
	561	eon = strchr(eov + 1, ' ');
	562	*eov = '\0';
	563	if (eon)
	564	*eon = '\0';
	565	*tail = alloc_ref(eov + 1);
	566	if (buf.buf[0] == '@')
	567	(*tail)->symref = xstrdup(buf.buf + 1);
	568	else if (buf.buf[0] != '?')
	569	get_sha1_hex(buf.buf, (*tail)->old_sha1);
f8ec9167 DB	570	if (eon) {
	571	if (has_attribute(eon + 1, "unchanged")) {
	572	(*tail)->status \|= REF_STATUS_UPTODATE;
	573	read_ref((tail)->name, (tail)->old_sha1);
	574	}
	575	}
6eb996b5 DB	576	tail = &((*tail)->next);
6eb996b5 DB	577	}
bf3c523c IL	578	if (debug)
bf3c523c IL	579	fprintf(stderr, "Debug: Read ref listing.\n");
6eb996b5 DB	580	strbuf_release(&buf);
	581
	582	for (posn = ret; posn; posn = posn->next)
	583	resolve_remote_symref(posn, ret);
	584
	585	return ret;
	586	}
	587
c9e388bb	588	int transport_helper_init(struct transport transport, const char name)
6eb996b5 DB	589	{
6eb996b5 DB	590	struct helper_data data = xcalloc(sizeof(data), 1);
c9e388bb	591	data->name = name;
6eb996b5	592
bf3c523c IL	593	if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
	594	debug = 1;
	595
6eb996b5	596	transport->data = data;
ef08ef9e	597	transport->set_option = set_helper_option;
6eb996b5 DB	598	transport->get_refs_list = get_refs_list;
6eb996b5 DB	599	transport->fetch = fetch;
ae4efe19	600	transport->push_refs = push_refs;
f2a37151	601	transport->disconnect = release_helper;
61b075bd	602	transport->smart_options = &(data->transport_options);
6eb996b5 DB	603	return 0;
6eb996b5 DB	604	}