[thirdparty/git.git] / send-pack.c

#include "builtin.h"
#include "commit.h"
#include "refs.h"
#include "pkt-line.h"
#include "sideband.h"
#include "run-command.h"
#include "remote.h"
#include "connect.h"
#include "send-pack.h"
#include "quote.h"
#include "transport.h"
#include "version.h"
#include "sha1-array.h"
#include "gpg-interface.h"
#include "cache.h"

int option_parse_push_signed(const struct option *opt,
			     const char *arg, int unset)
{
	if (unset) {
		*(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
		return 0;
	}
	switch (git_parse_maybe_bool(arg)) {
	case 1:
		*(int *)(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS;
		return 0;
	case 0:
		*(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
		return 0;
	}
	if (!strcasecmp("if-asked", arg)) {
		*(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
		return 0;
	}
	die("bad %s argument: %s", opt->long_name, arg);
}

static void feed_object(const unsigned char *sha1, FILE *fh, int negative)
{
	if (negative && !has_sha1_file(sha1))
		return;

	if (negative)
		putc('^', fh);
	fputs(sha1_to_hex(sha1), fh);
	putc('\n', fh);
}

/*
 * Make a pack stream and spit it out into file descriptor fd
 */
static int pack_objects(int fd, struct ref *refs, struct sha1_array *extra, struct send_pack_args *args)
{
	/*
	 * The child becomes pack-objects --revs; we feed
	 * the revision parameters to it via its stdin and
	 * let its stdout go back to the other end.
	 */
	const char *argv[] = {
		"pack-objects",
		"--all-progress-implied",
		"--revs",
		"--stdout",
		NULL,
		NULL,
		NULL,
		NULL,
		NULL,
		NULL,
	};
	struct child_process po = CHILD_PROCESS_INIT;
	FILE *po_in;
	int i;

	i = 4;
	if (args->use_thin_pack)
		argv[i++] = "--thin";
	if (args->use_ofs_delta)
		argv[i++] = "--delta-base-offset";
	if (args->quiet || !args->progress)
		argv[i++] = "-q";
	if (args->progress)
		argv[i++] = "--progress";
	if (is_repository_shallow())
		argv[i++] = "--shallow";
	po.argv = argv;
	po.in = -1;
	po.out = args->stateless_rpc ? -1 : fd;
	po.git_cmd = 1;
	if (start_command(&po))
		die_errno("git pack-objects failed");

	/*
	 * We feed the pack-objects we just spawned with revision
	 * parameters by writing to the pipe.
	 */
	po_in = xfdopen(po.in, "w");
	for (i = 0; i < extra->nr; i++)
		feed_object(extra->sha1[i], po_in, 1);

	while (refs) {
		if (!is_null_oid(&refs->old_oid))
			feed_object(refs->old_oid.hash, po_in, 1);
		if (!is_null_oid(&refs->new_oid))
			feed_object(refs->new_oid.hash, po_in, 0);
		refs = refs->next;
	}

	fflush(po_in);
	if (ferror(po_in))
		die_errno("error writing to pack-objects");
	fclose(po_in);

	if (args->stateless_rpc) {
		char *buf = xmalloc(LARGE_PACKET_MAX);
		while (1) {
			ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
			if (n <= 0)
				break;
			send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
		}
		free(buf);
		close(po.out);
		po.out = -1;
	}

	if (finish_command(&po))
		return -1;
	return 0;
}

static int receive_unpack_status(int in)
{
	const char *line = packet_read_line(in, NULL);
	if (!skip_prefix(line, "unpack ", &line))
		return error(_("unable to parse remote unpack status: %s"), line);
	if (strcmp(line, "ok"))
		return error(_("remote unpack failed: %s"), line);
	return 0;
}

static int receive_status(int in, struct ref *refs)
{
	struct ref *hint;
	int ret;

	hint = NULL;
	ret = receive_unpack_status(in);
	while (1) {
		char *refname;
		char *msg;
		char *line = packet_read_line(in, NULL);
		if (!line)
			break;
		if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
			error("invalid ref status from remote: %s", line);
			ret = -1;
			break;
		}

		refname = line + 3;
		msg = strchr(refname, ' ');
		if (msg)
			*msg++ = '\0';

		/* first try searching at our hint, falling back to all refs */
		if (hint)
			hint = find_ref_by_name(hint, refname);
		if (!hint)
			hint = find_ref_by_name(refs, refname);
		if (!hint) {
			warning("remote reported status on unknown ref: %s",
					refname);
			continue;
		}
		if (hint->status != REF_STATUS_EXPECTING_REPORT) {
			warning("remote reported status on unexpected ref: %s",
					refname);
			continue;
		}

		if (line[0] == 'o' && line[1] == 'k')
			hint->status = REF_STATUS_OK;
		else {
			hint->status = REF_STATUS_REMOTE_REJECT;
			ret = -1;
		}
		hint->remote_status = xstrdup_or_null(msg);
		/* start our next search from the next ref */
		hint = hint->next;
	}
	return ret;
}

static int sideband_demux(int in, int out, void *data)
{
	int *fd = data, ret;
#ifdef NO_PTHREADS
	close(fd[1]);
#endif
	ret = recv_sideband("send-pack", fd[0], out);
	close(out);
	return ret;
}

static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
{
	struct strbuf *sb = cb;
	if (graft->nr_parent == -1)
		packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
	return 0;
}

static void advertise_shallow_grafts_buf(struct strbuf *sb)
{
	if (!is_repository_shallow())
		return;
	for_each_commit_graft(advertise_shallow_grafts_cb, sb);
}

#define CHECK_REF_NO_PUSH -1
#define CHECK_REF_STATUS_REJECTED -2
#define CHECK_REF_UPTODATE -3
static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
{
	if (!ref->peer_ref && !args->send_mirror)
		return CHECK_REF_NO_PUSH;

	/* Check for statuses set by set_ref_status_for_push() */
	switch (ref->status) {
	case REF_STATUS_REJECT_NONFASTFORWARD:
	case REF_STATUS_REJECT_ALREADY_EXISTS:
	case REF_STATUS_REJECT_FETCH_FIRST:
	case REF_STATUS_REJECT_NEEDS_FORCE:
	case REF_STATUS_REJECT_STALE:
	case REF_STATUS_REJECT_NODELETE:
		return CHECK_REF_STATUS_REJECTED;
	case REF_STATUS_UPTODATE:
		return CHECK_REF_UPTODATE;
	default:
		return 0;
	}
}

/*
 * the beginning of the next line, or the end of buffer.
 *
 * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
 * convert many similar uses found by "git grep -A4 memchr".
 */
static const char *next_line(const char *line, size_t len)
{
	const char *nl = memchr(line, '\n', len);
	if (!nl)
		return line + len; /* incomplete line */
	return nl + 1;
}

static int generate_push_cert(struct strbuf *req_buf,
			      const struct ref *remote_refs,
			      struct send_pack_args *args,
			      const char *cap_string,
			      const char *push_cert_nonce)
{
	const struct ref *ref;
	struct string_list_item *item;
	char *signing_key = xstrdup(get_signing_key());
	const char *cp, *np;
	struct strbuf cert = STRBUF_INIT;
	int update_seen = 0;

	strbuf_addstr(&cert, "certificate version 0.1\n");
	strbuf_addf(&cert, "pusher %s ", signing_key);
	datestamp(&cert);
	strbuf_addch(&cert, '\n');
	if (args->url && *args->url) {
		char *anon_url = transport_anonymize_url(args->url);
		strbuf_addf(&cert, "pushee %s\n", anon_url);
		free(anon_url);
	}
	if (push_cert_nonce[0])
		strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
	if (args->push_options)
		for_each_string_list_item(item, args->push_options)
			strbuf_addf(&cert, "push-option %s\n", item->string);
	strbuf_addstr(&cert, "\n");

	for (ref = remote_refs; ref; ref = ref->next) {
		if (check_to_send_update(ref, args) < 0)
			continue;
		update_seen = 1;
		strbuf_addf(&cert, "%s %s %s\n",
			    oid_to_hex(&ref->old_oid),
			    oid_to_hex(&ref->new_oid),
			    ref->name);
	}
	if (!update_seen)
		goto free_return;

	if (sign_buffer(&cert, &cert, signing_key))
		die(_("failed to sign the push certificate"));

	packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
	for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
		np = next_line(cp, cert.buf + cert.len - cp);
		packet_buf_write(req_buf,
				 "%.*s", (int)(np - cp), cp);
	}
	packet_buf_write(req_buf, "push-cert-end\n");

free_return:
	free(signing_key);
	strbuf_release(&cert);
	return update_seen;
}


static int atomic_push_failure(struct send_pack_args *args,
			       struct ref *remote_refs,
			       struct ref *failing_ref)
{
	struct ref *ref;
	/* Mark other refs as failed */
	for (ref = remote_refs; ref; ref = ref->next) {
		if (!ref->peer_ref && !args->send_mirror)
			continue;

		switch (ref->status) {
		case REF_STATUS_EXPECTING_REPORT:
			ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
			continue;
		default:
			break; /* do nothing */
		}
	}
	return error("atomic push failed for ref %s. status: %d\n",
		     failing_ref->name, failing_ref->status);
}

#define NONCE_LEN_LIMIT 256

static void reject_invalid_nonce(const char *nonce, int len)
{
	int i = 0;

	if (NONCE_LEN_LIMIT <= len)
		die("the receiving end asked to sign an invalid nonce <%.*s>",
		    len, nonce);

	for (i = 0; i < len; i++) {
		int ch = nonce[i] & 0xFF;
		if (isalnum(ch) ||
		    ch == '-' || ch == '.' ||
		    ch == '/' || ch == '+' ||
		    ch == '=' || ch == '_')
			continue;
		die("the receiving end asked to sign an invalid nonce <%.*s>",
		    len, nonce);
	}
}

int send_pack(struct send_pack_args *args,
	      int fd[], struct child_process *conn,
	      struct ref *remote_refs,
	      struct sha1_array *extra_have)
{
	int in = fd[0];
	int out = fd[1];
	struct strbuf req_buf = STRBUF_INIT;
	struct strbuf cap_buf = STRBUF_INIT;
	struct ref *ref;
	int need_pack_data = 0;
	int allow_deleting_refs = 0;
	int status_report = 0;
	int use_sideband = 0;
	int quiet_supported = 0;
	int agent_supported = 0;
	int use_atomic = 0;
	int atomic_supported = 0;
	int use_push_options = 0;
	int push_options_supported = 0;
	unsigned cmds_sent = 0;
	int ret;
	struct async demux;
	const char *push_cert_nonce = NULL;

	/* Does the other end support the reporting? */
	if (server_supports("report-status"))
		status_report = 1;
	if (server_supports("delete-refs"))
		allow_deleting_refs = 1;
	if (server_supports("ofs-delta"))
		args->use_ofs_delta = 1;
	if (server_supports("side-band-64k"))
		use_sideband = 1;
	if (server_supports("quiet"))
		quiet_supported = 1;
	if (server_supports("agent"))
		agent_supported = 1;
	if (server_supports("no-thin"))
		args->use_thin_pack = 0;
	if (server_supports("atomic"))
		atomic_supported = 1;
	if (server_supports("push-options"))
		push_options_supported = 1;

	if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
		int len;
		push_cert_nonce = server_feature_value("push-cert", &len);
		if (push_cert_nonce) {
			reject_invalid_nonce(push_cert_nonce, len);
			push_cert_nonce = xmemdupz(push_cert_nonce, len);
		} else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
			die(_("the receiving end does not support --signed push"));
		} else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
			warning(_("not sending a push certificate since the"
				  " receiving end does not support --signed"
				  " push"));
		}
	}

	if (!remote_refs) {
		fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
			"Perhaps you should specify a branch such as 'master'.\n");
		return 0;
	}
	if (args->atomic && !atomic_supported)
		die(_("the receiving end does not support --atomic push"));

	use_atomic = atomic_supported && args->atomic;

	if (args->push_options && !push_options_supported)
		die(_("the receiving end does not support push options"));

	use_push_options = push_options_supported && args->push_options;

	if (status_report)
		strbuf_addstr(&cap_buf, " report-status");
	if (use_sideband)
		strbuf_addstr(&cap_buf, " side-band-64k");
	if (quiet_supported && (args->quiet || !args->progress))
		strbuf_addstr(&cap_buf, " quiet");
	if (use_atomic)
		strbuf_addstr(&cap_buf, " atomic");
	if (use_push_options)
		strbuf_addstr(&cap_buf, " push-options");
	if (agent_supported)
		strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());

	/*
	 * NEEDSWORK: why does delete-refs have to be so specific to
	 * send-pack machinery that set_ref_status_for_push() cannot
	 * set this bit for us???
	 */
	for (ref = remote_refs; ref; ref = ref->next)
		if (ref->deletion && !allow_deleting_refs)
			ref->status = REF_STATUS_REJECT_NODELETE;

	if (!args->dry_run)
		advertise_shallow_grafts_buf(&req_buf);

	if (!args->dry_run && push_cert_nonce)
		cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
					       cap_buf.buf, push_cert_nonce);

	/*
	 * Clear the status for each ref and see if we need to send
	 * the pack data.
	 */
	for (ref = remote_refs; ref; ref = ref->next) {
		switch (check_to_send_update(ref, args)) {
		case 0: /* no error */
			break;
		case CHECK_REF_STATUS_REJECTED:
			/*
			 * When we know the server would reject a ref update if
			 * we were to send it and we're trying to send the refs
			 * atomically, abort the whole operation.
			 */
			if (use_atomic)
				return atomic_push_failure(args, remote_refs, ref);
			/* Fallthrough for non atomic case. */
		default:
			continue;
		}
		if (!ref->deletion)
			need_pack_data = 1;

		if (args->dry_run || !status_report)
			ref->status = REF_STATUS_OK;
		else
			ref->status = REF_STATUS_EXPECTING_REPORT;
	}

	/*
	 * Finally, tell the other end!
	 */
	for (ref = remote_refs; ref; ref = ref->next) {
		char *old_hex, *new_hex;

		if (args->dry_run || push_cert_nonce)
			continue;

		if (check_to_send_update(ref, args) < 0)
			continue;

		old_hex = oid_to_hex(&ref->old_oid);
		new_hex = oid_to_hex(&ref->new_oid);
		if (!cmds_sent) {
			packet_buf_write(&req_buf,
					 "%s %s %s%c%s",
					 old_hex, new_hex, ref->name, 0,
					 cap_buf.buf);
			cmds_sent = 1;
		} else {
			packet_buf_write(&req_buf, "%s %s %s",
					 old_hex, new_hex, ref->name);
		}
	}

	if (args->stateless_rpc) {
		if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
			packet_buf_flush(&req_buf);
			send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
		}
	} else {
		write_or_die(out, req_buf.buf, req_buf.len);
		packet_flush(out);
	}
	strbuf_release(&req_buf);
	strbuf_release(&cap_buf);

	if (use_push_options) {
		struct string_list_item *item;
		struct strbuf sb = STRBUF_INIT;

		for_each_string_list_item(item, args->push_options)
			packet_buf_write(&sb, "%s", item->string);

		write_or_die(out, sb.buf, sb.len);
		packet_flush(out);
		strbuf_release(&sb);
	}

	if (use_sideband && cmds_sent) {
		memset(&demux, 0, sizeof(demux));
		demux.proc = sideband_demux;
		demux.data = fd;
		demux.out = -1;
		demux.isolate_sigpipe = 1;
		if (start_async(&demux))
			die("send-pack: unable to fork off sideband demultiplexer");
		in = demux.out;
	}

	if (need_pack_data && cmds_sent) {
		if (pack_objects(out, remote_refs, extra_have, args) < 0) {
			for (ref = remote_refs; ref; ref = ref->next)
				ref->status = REF_STATUS_NONE;
			if (args->stateless_rpc)
				close(out);
			if (git_connection_is_socket(conn))
				shutdown(fd[0], SHUT_WR);

			/*
			 * Do not even bother with the return value; we know we
			 * are failing, and just want the error() side effects.
			 */
			if (status_report)
				receive_unpack_status(in);

			if (use_sideband) {
				close(demux.out);
				finish_async(&demux);
			}
			fd[1] = -1;
			return -1;
		}
		if (!args->stateless_rpc)
			/* Closed by pack_objects() via start_command() */
			fd[1] = -1;
	}
	if (args->stateless_rpc && cmds_sent)
		packet_flush(out);

	if (status_report && cmds_sent)
		ret = receive_status(in, remote_refs);
	else
		ret = 0;
	if (args->stateless_rpc)
		packet_flush(out);

	if (use_sideband && cmds_sent) {
		close(demux.out);
		if (finish_async(&demux)) {
			error("error in sideband demultiplexer");
			ret = -1;
		}
	}

	if (ret < 0)
		return ret;

	if (args->porcelain)
		return 0;

	for (ref = remote_refs; ref; ref = ref->next) {
		switch (ref->status) {
		case REF_STATUS_NONE:
		case REF_STATUS_UPTODATE:
		case REF_STATUS_OK:
			break;
		default:
			return -1;
		}
	}
	return 0;
}
Commit	Line	Data
f5d942e1 NTND	1	#include "builtin.h"
	2	#include "commit.h"
	3	#include "refs.h"
	4	#include "pkt-line.h"
	5	#include "sideband.h"
	6	#include "run-command.h"
	7	#include "remote.h"
47a59185	8	#include "connect.h"
f5d942e1 NTND	9	#include "send-pack.h"
	10	#include "quote.h"
	11	#include "transport.h"
	12	#include "version.h"
13eb4626	13	#include "sha1-array.h"
a85b377d	14	#include "gpg-interface.h"
30261094 DB	15	#include "cache.h"
	16
	17	int option_parse_push_signed(const struct option *opt,
	18	const char *arg, int unset)
	19	{
	20	if (unset) {
	21	(int )(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
	22	return 0;
	23	}
	24	switch (git_parse_maybe_bool(arg)) {
	25	case 1:
	26	(int )(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS;
	27	return 0;
	28	case 0:
	29	(int )(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
	30	return 0;
	31	}
	32	if (!strcasecmp("if-asked", arg)) {
	33	(int )(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
	34	return 0;
	35	}
	36	die("bad %s argument: %s", opt->long_name, arg);
	37	}
f5d942e1	38
f0bca72d	39	static void feed_object(const unsigned char sha1, FILE fh, int negative)
f5d942e1	40	{
f5d942e1	41	if (negative && !has_sha1_file(sha1))
f0bca72d	42	return;
f5d942e1	43
f5d942e1	44	if (negative)
f0bca72d JK	45	putc('^', fh);
	46	fputs(sha1_to_hex(sha1), fh);
	47	putc('\n', fh);
f5d942e1 NTND	48	}
	49
	50	/*
	51	* Make a pack stream and spit it out into file descriptor fd
	52	*/
13eb4626	53	static int pack_objects(int fd, struct ref refs, struct sha1_array extra, struct send_pack_args *args)
f5d942e1 NTND	54	{
	55	/*
	56	* The child becomes pack-objects --revs; we feed
	57	* the revision parameters to it via its stdin and
	58	* let its stdout go back to the other end.
	59	*/
	60	const char *argv[] = {
	61	"pack-objects",
	62	"--all-progress-implied",
	63	"--revs",
	64	"--stdout",
	65	NULL,
	66	NULL,
	67	NULL,
	68	NULL,
	69	NULL,
2dacf26d	70	NULL,
f5d942e1	71	};
d3180279	72	struct child_process po = CHILD_PROCESS_INIT;
f0bca72d	73	FILE *po_in;
f5d942e1 NTND	74	int i;
	75
	76	i = 4;
	77	if (args->use_thin_pack)
	78	argv[i++] = "--thin";
	79	if (args->use_ofs_delta)
	80	argv[i++] = "--delta-base-offset";
	81	if (args->quiet \|\| !args->progress)
	82	argv[i++] = "-q";
	83	if (args->progress)
	84	argv[i++] = "--progress";
2dacf26d	85	if (is_repository_shallow())
2dacf26d	86	argv[i++] = "--shallow";
f5d942e1 NTND	87	po.argv = argv;
	88	po.in = -1;
	89	po.out = args->stateless_rpc ? -1 : fd;
	90	po.git_cmd = 1;
	91	if (start_command(&po))
	92	die_errno("git pack-objects failed");
	93
	94	/*
	95	* We feed the pack-objects we just spawned with revision
	96	* parameters by writing to the pipe.
	97	*/
f0bca72d	98	po_in = xfdopen(po.in, "w");
f5d942e1	99	for (i = 0; i < extra->nr; i++)
f0bca72d	100	feed_object(extra->sha1[i], po_in, 1);
f5d942e1 NTND	101
f5d942e1 NTND	102	while (refs) {
f0bca72d JK	103	if (!is_null_oid(&refs->old_oid))
	104	feed_object(refs->old_oid.hash, po_in, 1);
	105	if (!is_null_oid(&refs->new_oid))
	106	feed_object(refs->new_oid.hash, po_in, 0);
f5d942e1 NTND	107	refs = refs->next;
	108	}
	109
f0bca72d JK	110	fflush(po_in);
	111	if (ferror(po_in))
	112	die_errno("error writing to pack-objects");
	113	fclose(po_in);
f5d942e1 NTND	114
	115	if (args->stateless_rpc) {
	116	char *buf = xmalloc(LARGE_PACKET_MAX);
	117	while (1) {
	118	ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
	119	if (n <= 0)
	120	break;
	121	send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
	122	}
	123	free(buf);
	124	close(po.out);
	125	po.out = -1;
	126	}
	127
	128	if (finish_command(&po))
	129	return -1;
	130	return 0;
	131	}
	132
7c39df29	133	static int receive_unpack_status(int in)
f5d942e1	134	{
7c39df29	135	const char *line = packet_read_line(in, NULL);
f7cd74d1	136	if (!skip_prefix(line, "unpack ", &line))
40d05d04	137	return error(_("unable to parse remote unpack status: %s"), line);
f7cd74d1	138	if (strcmp(line, "ok"))
40d05d04	139	return error(_("remote unpack failed: %s"), line);
7c39df29 JK	140	return 0;
	141	}
	142
	143	static int receive_status(int in, struct ref *refs)
	144	{
	145	struct ref *hint;
	146	int ret;
	147
f5d942e1	148	hint = NULL;
7c39df29	149	ret = receive_unpack_status(in);
f5d942e1 NTND	150	while (1) {
	151	char *refname;
	152	char *msg;
7c39df29	153	char *line = packet_read_line(in, NULL);
74543a04	154	if (!line)
f5d942e1	155	break;
59556548	156	if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
8f9e3e49	157	error("invalid ref status from remote: %s", line);
f5d942e1 NTND	158	ret = -1;
	159	break;
	160	}
	161
f5d942e1 NTND	162	refname = line + 3;
	163	msg = strchr(refname, ' ');
	164	if (msg)
	165	*msg++ = '\0';
	166
	167	/* first try searching at our hint, falling back to all refs */
	168	if (hint)
	169	hint = find_ref_by_name(hint, refname);
	170	if (!hint)
	171	hint = find_ref_by_name(refs, refname);
	172	if (!hint) {
	173	warning("remote reported status on unknown ref: %s",
	174	refname);
	175	continue;
	176	}
	177	if (hint->status != REF_STATUS_EXPECTING_REPORT) {
	178	warning("remote reported status on unexpected ref: %s",
	179	refname);
	180	continue;
	181	}
	182
	183	if (line[0] == 'o' && line[1] == 'k')
	184	hint->status = REF_STATUS_OK;
	185	else {
	186	hint->status = REF_STATUS_REMOTE_REJECT;
	187	ret = -1;
	188	}
13092a91	189	hint->remote_status = xstrdup_or_null(msg);
f5d942e1 NTND	190	/* start our next search from the next ref */
	191	hint = hint->next;
	192	}
	193	return ret;
	194	}
	195
	196	static int sideband_demux(int in, int out, void *data)
	197	{
	198	int *fd = data, ret;
	199	#ifdef NO_PTHREADS
	200	close(fd[1]);
	201	#endif
	202	ret = recv_sideband("send-pack", fd[0], out);
	203	close(out);
	204	return ret;
	205	}
	206
f2c681cf NTND	207	static int advertise_shallow_grafts_cb(const struct commit_graft graft, void cb)
	208	{
	209	struct strbuf *sb = cb;
	210	if (graft->nr_parent == -1)
7683e2e6	211	packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
f2c681cf NTND	212	return 0;
	213	}
	214
16a2743c	215	static void advertise_shallow_grafts_buf(struct strbuf *sb)
f2c681cf NTND	216	{
	217	if (!is_repository_shallow())
	218	return;
	219	for_each_commit_graft(advertise_shallow_grafts_cb, sb);
	220	}
	221
7582e939 SB	222	#define CHECK_REF_NO_PUSH -1
	223	#define CHECK_REF_STATUS_REJECTED -2
	224	#define CHECK_REF_UPTODATE -3
	225	static int check_to_send_update(const struct ref ref, const struct send_pack_args args)
e40671a3 JH	226	{
e40671a3 JH	227	if (!ref->peer_ref && !args->send_mirror)
7582e939	228	return CHECK_REF_NO_PUSH;
e40671a3 JH	229
	230	/* Check for statuses set by set_ref_status_for_push() */
	231	switch (ref->status) {
	232	case REF_STATUS_REJECT_NONFASTFORWARD:
	233	case REF_STATUS_REJECT_ALREADY_EXISTS:
	234	case REF_STATUS_REJECT_FETCH_FIRST:
	235	case REF_STATUS_REJECT_NEEDS_FORCE:
	236	case REF_STATUS_REJECT_STALE:
	237	case REF_STATUS_REJECT_NODELETE:
7582e939	238	return CHECK_REF_STATUS_REJECTED;
e40671a3	239	case REF_STATUS_UPTODATE:
7582e939	240	return CHECK_REF_UPTODATE;
e40671a3	241	default:
7582e939	242	return 0;
e40671a3 JH	243	}
	244	}
	245
a85b377d JH	246	/*
	247	* the beginning of the next line, or the end of buffer.
	248	*
	249	* NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
	250	* convert many similar uses found by "git grep -A4 memchr".
	251	*/
	252	static const char next_line(const char line, size_t len)
	253	{
	254	const char *nl = memchr(line, '\n', len);
	255	if (!nl)
	256	return line + len; /* incomplete line */
	257	return nl + 1;
	258	}
	259
20a7558f JH	260	static int generate_push_cert(struct strbuf *req_buf,
	261	const struct ref *remote_refs,
	262	struct send_pack_args *args,
b89363e4 JH	263	const char *cap_string,
b89363e4 JH	264	const char *push_cert_nonce)
a85b377d JH	265	{
a85b377d JH	266	const struct ref *ref;
f6a4e61f	267	struct string_list_item *item;
a85b377d JH	268	char *signing_key = xstrdup(get_signing_key());
	269	const char cp, np;
	270	struct strbuf cert = STRBUF_INIT;
	271	int update_seen = 0;
	272
02962d36	273	strbuf_addstr(&cert, "certificate version 0.1\n");
fb06b528 JH	274	strbuf_addf(&cert, "pusher %s ", signing_key);
	275	datestamp(&cert);
	276	strbuf_addch(&cert, '\n');
9be89160 JH	277	if (args->url && *args->url) {
	278	char *anon_url = transport_anonymize_url(args->url);
	279	strbuf_addf(&cert, "pushee %s\n", anon_url);
	280	free(anon_url);
	281	}
b89363e4 JH	282	if (push_cert_nonce[0])
b89363e4 JH	283	strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
f6a4e61f SB	284	if (args->push_options)
	285	for_each_string_list_item(item, args->push_options)
	286	strbuf_addf(&cert, "push-option %s\n", item->string);
a85b377d JH	287	strbuf_addstr(&cert, "\n");
	288
	289	for (ref = remote_refs; ref; ref = ref->next) {
7582e939	290	if (check_to_send_update(ref, args) < 0)
a85b377d JH	291	continue;
	292	update_seen = 1;
	293	strbuf_addf(&cert, "%s %s %s\n",
f4e54d02	294	oid_to_hex(&ref->old_oid),
f4e54d02	295	oid_to_hex(&ref->new_oid),
a85b377d JH	296	ref->name);
	297	}
	298	if (!update_seen)
	299	goto free_return;
	300
	301	if (sign_buffer(&cert, &cert, signing_key))
	302	die(_("failed to sign the push certificate"));
	303
20a7558f	304	packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
a85b377d JH	305	for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
	306	np = next_line(cp, cert.buf + cert.len - cp);
	307	packet_buf_write(req_buf,
	308	"%.*s", (int)(np - cp), cp);
	309	}
	310	packet_buf_write(req_buf, "push-cert-end\n");
	311
	312	free_return:
	313	free(signing_key);
	314	strbuf_release(&cert);
20a7558f	315	return update_seen;
a85b377d JH	316	}
a85b377d JH	317
4ff17f10 RS	318
	319	static int atomic_push_failure(struct send_pack_args *args,
	320	struct ref *remote_refs,
	321	struct ref *failing_ref)
	322	{
	323	struct ref *ref;
	324	/* Mark other refs as failed */
	325	for (ref = remote_refs; ref; ref = ref->next) {
	326	if (!ref->peer_ref && !args->send_mirror)
	327	continue;
	328
	329	switch (ref->status) {
	330	case REF_STATUS_EXPECTING_REPORT:
	331	ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
	332	continue;
	333	default:
	334	break; /* do nothing */
	335	}
	336	}
	337	return error("atomic push failed for ref %s. status: %d\n",
	338	failing_ref->name, failing_ref->status);
	339	}
	340
afcb6ee3 JH	341	#define NONCE_LEN_LIMIT 256
	342
	343	static void reject_invalid_nonce(const char *nonce, int len)
	344	{
	345	int i = 0;
	346
	347	if (NONCE_LEN_LIMIT <= len)
	348	die("the receiving end asked to sign an invalid nonce <%.*s>",
	349	len, nonce);
	350
	351	for (i = 0; i < len; i++) {
	352	int ch = nonce[i] & 0xFF;
	353	if (isalnum(ch) \|\|
	354	ch == '-' \|\| ch == '.' \|\|
	355	ch == '/' \|\| ch == '+' \|\|
	356	ch == '=' \|\| ch == '_')
	357	continue;
	358	die("the receiving end asked to sign an invalid nonce <%.*s>",
	359	len, nonce);
	360	}
	361	}
	362
f5d942e1 NTND	363	int send_pack(struct send_pack_args *args,
	364	int fd[], struct child_process *conn,
	365	struct ref *remote_refs,
13eb4626	366	struct sha1_array *extra_have)
f5d942e1 NTND	367	{
	368	int in = fd[0];
	369	int out = fd[1];
	370	struct strbuf req_buf = STRBUF_INIT;
887f3533	371	struct strbuf cap_buf = STRBUF_INIT;
f5d942e1	372	struct ref *ref;
ab2b0c90	373	int need_pack_data = 0;
f5d942e1 NTND	374	int allow_deleting_refs = 0;
	375	int status_report = 0;
	376	int use_sideband = 0;
	377	int quiet_supported = 0;
	378	int agent_supported = 0;
4ff17f10 RS	379	int use_atomic = 0;
4ff17f10 RS	380	int atomic_supported = 0;
f6a4e61f SB	381	int use_push_options = 0;
f6a4e61f SB	382	int push_options_supported = 0;
f5d942e1 NTND	383	unsigned cmds_sent = 0;
	384	int ret;
	385	struct async demux;
b89363e4	386	const char *push_cert_nonce = NULL;
f5d942e1 NTND	387
	388	/* Does the other end support the reporting? */
	389	if (server_supports("report-status"))
	390	status_report = 1;
	391	if (server_supports("delete-refs"))
	392	allow_deleting_refs = 1;
	393	if (server_supports("ofs-delta"))
	394	args->use_ofs_delta = 1;
	395	if (server_supports("side-band-64k"))
	396	use_sideband = 1;
	397	if (server_supports("quiet"))
	398	quiet_supported = 1;
	399	if (server_supports("agent"))
	400	agent_supported = 1;
1ba98a79 CMN	401	if (server_supports("no-thin"))
1ba98a79 CMN	402	args->use_thin_pack = 0;
4ff17f10 RS	403	if (server_supports("atomic"))
4ff17f10 RS	404	atomic_supported = 1;
f6a4e61f SB	405	if (server_supports("push-options"))
f6a4e61f SB	406	push_options_supported = 1;
b89363e4	407
30261094 DB	408	if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
30261094 DB	409	int len;
b89363e4	410	push_cert_nonce = server_feature_value("push-cert", &len);
30261094 DB	411	if (push_cert_nonce) {
	412	reject_invalid_nonce(push_cert_nonce, len);
	413	push_cert_nonce = xmemdupz(push_cert_nonce, len);
	414	} else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
b89363e4	415	die(_("the receiving end does not support --signed push"));
30261094 DB	416	} else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
	417	warning(_("not sending a push certificate since the"
	418	" receiving end does not support --signed"
	419	" push"));
	420	}
b89363e4	421	}
f5d942e1 NTND	422
	423	if (!remote_refs) {
	424	fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
	425	"Perhaps you should specify a branch such as 'master'.\n");
	426	return 0;
	427	}
4ff17f10	428	if (args->atomic && !atomic_supported)
c8b8f22a	429	die(_("the receiving end does not support --atomic push"));
4ff17f10 RS	430
4ff17f10 RS	431	use_atomic = atomic_supported && args->atomic;
f5d942e1	432
f6a4e61f SB	433	if (args->push_options && !push_options_supported)
	434	die(_("the receiving end does not support push options"));
	435
	436	use_push_options = push_options_supported && args->push_options;
	437
887f3533 JH	438	if (status_report)
	439	strbuf_addstr(&cap_buf, " report-status");
	440	if (use_sideband)
	441	strbuf_addstr(&cap_buf, " side-band-64k");
	442	if (quiet_supported && (args->quiet \|\| !args->progress))
	443	strbuf_addstr(&cap_buf, " quiet");
4ff17f10 RS	444	if (use_atomic)
4ff17f10 RS	445	strbuf_addstr(&cap_buf, " atomic");
f6a4e61f SB	446	if (use_push_options)
f6a4e61f SB	447	strbuf_addstr(&cap_buf, " push-options");
887f3533 JH	448	if (agent_supported)
	449	strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
	450
621b0599 JH	451	/*
	452	* NEEDSWORK: why does delete-refs have to be so specific to
	453	* send-pack machinery that set_ref_status_for_push() cannot
	454	* set this bit for us???
	455	*/
	456	for (ref = remote_refs; ref; ref = ref->next)
	457	if (ref->deletion && !allow_deleting_refs)
	458	ref->status = REF_STATUS_REJECT_NODELETE;
	459
5dbd7676	460	if (!args->dry_run)
f2c681cf	461	advertise_shallow_grafts_buf(&req_buf);
5dbd7676	462
30261094	463	if (!args->dry_run && push_cert_nonce)
20a7558f	464	cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
b89363e4	465	cap_buf.buf, push_cert_nonce);
a85b377d	466
f5d942e1	467	/*
b783aa71 JH	468	* Clear the status for each ref and see if we need to send
b783aa71 JH	469	* the pack data.
f5d942e1	470	*/
f5d942e1	471	for (ref = remote_refs; ref; ref = ref->next) {
4ff17f10 RS	472	switch (check_to_send_update(ref, args)) {
	473	case 0: /* no error */
	474	break;
	475	case CHECK_REF_STATUS_REJECTED:
	476	/*
	477	* When we know the server would reject a ref update if
	478	* we were to send it and we're trying to send the refs
	479	* atomically, abort the whole operation.
	480	*/
	481	if (use_atomic)
	482	return atomic_push_failure(args, remote_refs, ref);
	483	/* Fallthrough for non atomic case. */
	484	default:
f5d942e1	485	continue;
4ff17f10	486	}
f5d942e1	487	if (!ref->deletion)
ab2b0c90	488	need_pack_data = 1;
f5d942e1	489
b783aa71	490	if (args->dry_run \|\| !status_report)
f5d942e1	491	ref->status = REF_STATUS_OK;
b783aa71 JH	492	else
	493	ref->status = REF_STATUS_EXPECTING_REPORT;
	494	}
	495
	496	/*
	497	* Finally, tell the other end!
	498	*/
	499	for (ref = remote_refs; ref; ref = ref->next) {
	500	char old_hex, new_hex;
	501
30261094	502	if (args->dry_run \|\| push_cert_nonce)
f5d942e1	503	continue;
f5d942e1	504
7582e939	505	if (check_to_send_update(ref, args) < 0)
b783aa71	506	continue;
f5d942e1	507
f4e54d02	508	old_hex = oid_to_hex(&ref->old_oid);
f4e54d02	509	new_hex = oid_to_hex(&ref->new_oid);
c67072b9	510	if (!cmds_sent) {
b783aa71 JH	511	packet_buf_write(&req_buf,
	512	"%s %s %s%c%s",
	513	old_hex, new_hex, ref->name, 0,
	514	cap_buf.buf);
c67072b9	515	cmds_sent = 1;
f5d942e1	516	} else {
b783aa71 JH	517	packet_buf_write(&req_buf, "%s %s %s",
b783aa71 JH	518	old_hex, new_hex, ref->name);
f5d942e1 NTND	519	}
	520	}
	521
	522	if (args->stateless_rpc) {
f2c681cf	523	if (!args->dry_run && (cmds_sent \|\| is_repository_shallow())) {
f5d942e1 NTND	524	packet_buf_flush(&req_buf);
	525	send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
	526	}
	527	} else {
cdf4fb8e	528	write_or_die(out, req_buf.buf, req_buf.len);
f5d942e1 NTND	529	packet_flush(out);
	530	}
	531	strbuf_release(&req_buf);
887f3533	532	strbuf_release(&cap_buf);
f5d942e1	533
f6a4e61f SB	534	if (use_push_options) {
	535	struct string_list_item *item;
	536	struct strbuf sb = STRBUF_INIT;
	537
	538	for_each_string_list_item(item, args->push_options)
	539	packet_buf_write(&sb, "%s", item->string);
	540
	541	write_or_die(out, sb.buf, sb.len);
	542	packet_flush(out);
	543	strbuf_release(&sb);
	544	}
	545
f5d942e1 NTND	546	if (use_sideband && cmds_sent) {
	547	memset(&demux, 0, sizeof(demux));
	548	demux.proc = sideband_demux;
	549	demux.data = fd;
	550	demux.out = -1;
3e8b06d0	551	demux.isolate_sigpipe = 1;
f5d942e1 NTND	552	if (start_async(&demux))
	553	die("send-pack: unable to fork off sideband demultiplexer");
	554	in = demux.out;
	555	}
	556
ab2b0c90	557	if (need_pack_data && cmds_sent) {
f5d942e1 NTND	558	if (pack_objects(out, remote_refs, extra_have, args) < 0) {
	559	for (ref = remote_refs; ref; ref = ref->next)
	560	ref->status = REF_STATUS_NONE;
	561	if (args->stateless_rpc)
	562	close(out);
	563	if (git_connection_is_socket(conn))
	564	shutdown(fd[0], SHUT_WR);
ba69f92d JK	565
	566	/*
	567	* Do not even bother with the return value; we know we
	568	* are failing, and just want the error() side effects.
	569	*/
	570	if (status_report)
	571	receive_unpack_status(in);
	572
739cf491 JK	573	if (use_sideband) {
739cf491 JK	574	close(demux.out);
f5d942e1	575	finish_async(&demux);
739cf491	576	}
37cb1dd6	577	fd[1] = -1;
f5d942e1 NTND	578	return -1;
f5d942e1 NTND	579	}
37cb1dd6 JL	580	if (!args->stateless_rpc)
	581	/* Closed by pack_objects() via start_command() */
	582	fd[1] = -1;
f5d942e1 NTND	583	}
	584	if (args->stateless_rpc && cmds_sent)
	585	packet_flush(out);
	586
	587	if (status_report && cmds_sent)
	588	ret = receive_status(in, remote_refs);
	589	else
	590	ret = 0;
	591	if (args->stateless_rpc)
	592	packet_flush(out);
	593
	594	if (use_sideband && cmds_sent) {
739cf491	595	close(demux.out);
f5d942e1 NTND	596	if (finish_async(&demux)) {
	597	error("error in sideband demultiplexer");
	598	ret = -1;
	599	}
f5d942e1 NTND	600	}
	601
	602	if (ret < 0)
	603	return ret;
	604
	605	if (args->porcelain)
	606	return 0;
	607
	608	for (ref = remote_refs; ref; ref = ref->next) {
	609	switch (ref->status) {
	610	case REF_STATUS_NONE:
	611	case REF_STATUS_UPTODATE:
	612	case REF_STATUS_OK:
	613	break;
	614	default:
	615	return -1;
	616	}
	617	}
	618	return 0;
	619	}