1 files changed, 963 insertions, 60 deletions

diff --git a/remote-curl.c b/remote-curl.c
index 2faf1c6344..af7b6786dc 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -4,45 +4,164 @@
 #include "walker.h"
 #include "http.h"
 #include "exec_cmd.h"
+#include "run-command.h"
+#include "pkt-line.h"
+#include "string-list.h"
+#include "sideband.h"
+#include "argv-array.h"
+#include "credential.h"
+#include "sha1-array.h"
 
-static struct ref *get_refs(struct walker *walker, const char *url)
+static struct remote *remote;
+/* always ends with a trailing slash */
+static struct strbuf url = STRBUF_INIT;
+
+struct options {
+	int verbosity;
+	unsigned long depth;
+	unsigned progress : 1,
+		check_self_contained_and_connected : 1,
+		cloning : 1,
+		update_shallow : 1,
+		followtags : 1,
+		dry_run : 1,
+		thin : 1,
+		push_cert : 1;
+};
+static struct options options;
+static struct string_list cas_options = STRING_LIST_INIT_DUP;
+
+static int set_option(const char *name, const char *value)
+{
+	if (!strcmp(name, "verbosity")) {
+		char *end;
+		int v = strtol(value, &end, 10);
+		if (value == end || *end)
+			return -1;
+		options.verbosity = v;
+		return 0;
+	}
+	else if (!strcmp(name, "progress")) {
+		if (!strcmp(value, "true"))
+			options.progress = 1;
+		else if (!strcmp(value, "false"))
+			options.progress = 0;
+		else
+			return -1;
+		return 0;
+	}
+	else if (!strcmp(name, "depth")) {
+		char *end;
+		unsigned long v = strtoul(value, &end, 10);
+		if (value == end || *end)
+			return -1;
+		options.depth = v;
+		return 0;
+	}
+	else if (!strcmp(name, "followtags")) {
+		if (!strcmp(value, "true"))
+			options.followtags = 1;
+		else if (!strcmp(value, "false"))
+			options.followtags = 0;
+		else
+			return -1;
+		return 0;
+	}
+	else if (!strcmp(name, "dry-run")) {
+		if (!strcmp(value, "true"))
+			options.dry_run = 1;
+		else if (!strcmp(value, "false"))
+			options.dry_run = 0;
+		else
+			return -1;
+		return 0;
+	}
+	else if (!strcmp(name, "check-connectivity")) {
+		if (!strcmp(value, "true"))
+			options.check_self_contained_and_connected = 1;
+		else if (!strcmp(value, "false"))
+			options.check_self_contained_and_connected = 0;
+		else
+			return -1;
+		return 0;
+	}
+	else if (!strcmp(name, "cas")) {
+		struct strbuf val = STRBUF_INIT;
+		strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
+		string_list_append(&cas_options, val.buf);
+		strbuf_release(&val);
+		return 0;
+	} else if (!strcmp(name, "cloning")) {
+		if (!strcmp(value, "true"))
+			options.cloning = 1;
+		else if (!strcmp(value, "false"))
+			options.cloning = 0;
+		else
+			return -1;
+		return 0;
+	} else if (!strcmp(name, "update-shallow")) {
+		if (!strcmp(value, "true"))
+			options.update_shallow = 1;
+		else if (!strcmp(value, "false"))
+			options.update_shallow = 0;
+		else
+			return -1;
+		return 0;
+	} else if (!strcmp(name, "pushcert")) {
+		if (!strcmp(value, "true"))
+			options.push_cert = 1;
+		else if (!strcmp(value, "false"))
+			options.push_cert = 0;
+		else
+			return -1;
+		return 0;
+	} else {
+		return 1 /* unsupported */;
+	}
+}
+
+struct discovery {
+	const char *service;
+	char *buf_alloc;
+	char *buf;
+	size_t len;
+	struct ref *refs;
+	struct sha1_array shallow;
+	unsigned proto_git : 1;
+};
+static struct discovery *last_discovery;
+
+static struct ref *parse_git_refs(struct discovery *heads, int for_push)
+{
+	struct ref *list = NULL;
+	get_remote_heads(-1, heads->buf, heads->len, &list,
+			 for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
+	return list;
+}
+
+static struct ref *parse_info_refs(struct discovery *heads)
 {
-	struct strbuf buffer = STRBUF_INIT;
 	char *data, *start, *mid;
 	char *ref_name;
-	char *refs_url;
 	int i = 0;
-	int http_ret;
 
 	struct ref *refs = NULL;
 	struct ref *ref = NULL;
 	struct ref *last_ref = NULL;
 
-	refs_url = xmalloc(strlen(url) + 11);
-	sprintf(refs_url, "%s/info/refs", url);
-
-	http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
-	switch (http_ret) {
-	case HTTP_OK:
-		break;
-	case HTTP_MISSING_TARGET:
-		die("%s not found: did you run git update-server-info on the"
-		    " server?", refs_url);
-	default:
-		http_error(refs_url, http_ret);
-		die("HTTP request failed");
-	}
-
-	data = buffer.buf;
+	data = heads->buf;
 	start = NULL;
 	mid = data;
-	while (i < buffer.len) {
+	while (i < heads->len) {
 		if (!start) {
 			start = &data[i];
 		}
 		if (data[i] == '\t')
 			mid = &data[i];
 		if (data[i] == '\n') {
+			if (mid - start != 40)
+				die("%sinfo/refs not valid: is this a git repository?",
+				    url.buf);
 			data[i] = 0;
 			ref_name = mid + 1;
 			ref = xmalloc(sizeof(struct ref) +
@@ -60,10 +179,8 @@ static struct ref *get_refs(struct walker *walker, const char *url)
 		i++;
 	}
 
-	strbuf_release(&buffer);
-
 	ref = alloc_ref("HEAD");
-	if (!walker->fetch_ref(walker, ref) &&
+	if (!http_fetch_ref(url.buf, ref) &&
 	    !resolve_remote_symref(ref, refs)) {
 		ref->next = refs;
 		refs = ref;
@@ -71,71 +188,857 @@ static struct ref *get_refs(struct walker *walker, const char *url)
 		free(ref);
 	}
 
-	strbuf_release(&buffer);
-	free(refs_url);
 	return refs;
 }
 
+static void free_discovery(struct discovery *d)
+{
+	if (d) {
+		if (d == last_discovery)
+			last_discovery = NULL;
+		free(d->shallow.sha1);
+		free(d->buf_alloc);
+		free_refs(d->refs);
+		free(d);
+	}
+}
+
+static int show_http_message(struct strbuf *type, struct strbuf *charset,
+			     struct strbuf *msg)
+{
+	const char *p, *eol;
+
+	/*
+	 * We only show text/plain parts, as other types are likely
+	 * to be ugly to look at on the user's terminal.
+	 */
+	if (strcmp(type->buf, "text/plain"))
+		return -1;
+	if (charset->len)
+		strbuf_reencode(msg, charset->buf, get_log_output_encoding());
+
+	strbuf_trim(msg);
+	if (!msg->len)
+		return -1;
+
+	p = msg->buf;
+	do {
+		eol = strchrnul(p, '\n');
+		fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
+		p = eol + 1;
+	} while(*eol);
+	return 0;
+}
+
+static struct discovery *discover_refs(const char *service, int for_push)
+{
+	struct strbuf exp = STRBUF_INIT;
+	struct strbuf type = STRBUF_INIT;
+	struct strbuf charset = STRBUF_INIT;
+	struct strbuf buffer = STRBUF_INIT;
+	struct strbuf refs_url = STRBUF_INIT;
+	struct strbuf effective_url = STRBUF_INIT;
+	struct discovery *last = last_discovery;
+	int http_ret, maybe_smart = 0;
+	struct http_get_options options;
+
+	if (last && !strcmp(service, last->service))
+		return last;
+	free_discovery(last);
+
+	strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
+	if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
+	     git_env_bool("GIT_SMART_HTTP", 1)) {
+		maybe_smart = 1;
+		if (!strchr(url.buf, '?'))
+			strbuf_addch(&refs_url, '?');
+		else
+			strbuf_addch(&refs_url, '&');
+		strbuf_addf(&refs_url, "service=%s", service);
+	}
+
+	memset(&options, 0, sizeof(options));
+	options.content_type = &type;
+	options.charset = &charset;
+	options.effective_url = &effective_url;
+	options.base_url = &url;
+	options.no_cache = 1;
+	options.keep_error = 1;
+
+	http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
+	switch (http_ret) {
+	case HTTP_OK:
+		break;
+	case HTTP_MISSING_TARGET:
+		show_http_message(&type, &charset, &buffer);
+		die("repository '%s' not found", url.buf);
+	case HTTP_NOAUTH:
+		show_http_message(&type, &charset, &buffer);
+		die("Authentication failed for '%s'", url.buf);
+	default:
+		show_http_message(&type, &charset, &buffer);
+		die("unable to access '%s': %s", url.buf, curl_errorstr);
+	}
+
+	last= xcalloc(1, sizeof(*last_discovery));
+	last->service = service;
+	last->buf_alloc = strbuf_detach(&buffer, &last->len);
+	last->buf = last->buf_alloc;
+
+	strbuf_addf(&exp, "application/x-%s-advertisement", service);
+	if (maybe_smart &&
+	    (5 <= last->len && last->buf[4] == '#') &&
+	    !strbuf_cmp(&exp, &type)) {
+		char *line;
+
+		/*
+		 * smart HTTP response; validate that the service
+		 * pkt-line matches our request.
+		 */
+		line = packet_read_line_buf(&last->buf, &last->len, NULL);
+
+		strbuf_reset(&exp);
+		strbuf_addf(&exp, "# service=%s", service);
+		if (strcmp(line, exp.buf))
+			die("invalid server response; got '%s'", line);
+		strbuf_release(&exp);
+
+		/* The header can include additional metadata lines, up
+		 * until a packet flush marker.  Ignore these now, but
+		 * in the future we might start to scan them.
+		 */
+		while (packet_read_line_buf(&last->buf, &last->len, NULL))
+			;
+
+		last->proto_git = 1;
+	}
+
+	if (last->proto_git)
+		last->refs = parse_git_refs(last, for_push);
+	else
+		last->refs = parse_info_refs(last);
+
+	strbuf_release(&refs_url);
+	strbuf_release(&exp);
+	strbuf_release(&type);
+	strbuf_release(&charset);
+	strbuf_release(&effective_url);
+	strbuf_release(&buffer);
+	last_discovery = last;
+	return last;
+}
+
+static struct ref *get_refs(int for_push)
+{
+	struct discovery *heads;
+
+	if (for_push)
+		heads = discover_refs("git-receive-pack", for_push);
+	else
+		heads = discover_refs("git-upload-pack", for_push);
+
+	return heads->refs;
+}
+
+static void output_refs(struct ref *refs)
+{
+	struct ref *posn;
+	for (posn = refs; posn; posn = posn->next) {
+		if (posn->symref)
+			printf("@%s %s\n", posn->symref, posn->name);
+		else
+			printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
+	}
+	printf("\n");
+	fflush(stdout);
+}
+
+struct rpc_state {
+	const char *service_name;
+	const char **argv;
+	struct strbuf *stdin_preamble;
+	char *service_url;
+	char *hdr_content_type;
+	char *hdr_accept;
+	char *buf;
+	size_t alloc;
+	size_t len;
+	size_t pos;
+	int in;
+	int out;
+	struct strbuf result;
+	unsigned gzip_request : 1;
+	unsigned initial_buffer : 1;
+};
+
+static size_t rpc_out(void *ptr, size_t eltsize,
+		size_t nmemb, void *buffer_)
+{
+	size_t max = eltsize * nmemb;
+	struct rpc_state *rpc = buffer_;
+	size_t avail = rpc->len - rpc->pos;
+
+	if (!avail) {
+		rpc->initial_buffer = 0;
+		avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
+		if (!avail)
+			return 0;
+		rpc->pos = 0;
+		rpc->len = avail;
+	}
+
+	if (max < avail)
+		avail = max;
+	memcpy(ptr, rpc->buf + rpc->pos, avail);
+	rpc->pos += avail;
+	return avail;
+}
+
+#ifndef NO_CURL_IOCTL
+static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
+{
+	struct rpc_state *rpc = clientp;
+
+	switch (cmd) {
+	case CURLIOCMD_NOP:
+		return CURLIOE_OK;
+
+	case CURLIOCMD_RESTARTREAD:
+		if (rpc->initial_buffer) {
+			rpc->pos = 0;
+			return CURLIOE_OK;
+		}
+		error("unable to rewind rpc post data - try increasing http.postBuffer");
+		return CURLIOE_FAILRESTART;
+
+	default:
+		return CURLIOE_UNKNOWNCMD;
+	}
+}
+#endif
+
+static size_t rpc_in(char *ptr, size_t eltsize,
+		size_t nmemb, void *buffer_)
+{
+	size_t size = eltsize * nmemb;
+	struct rpc_state *rpc = buffer_;
+	write_or_die(rpc->in, ptr, size);
+	return size;
+}
+
+static int run_slot(struct active_request_slot *slot,
+		    struct slot_results *results)
+{
+	int err;
+	struct slot_results results_buf;
+
+	if (!results)
+		results = &results_buf;
+
+	err = run_one_slot(slot, results);
+
+	if (err != HTTP_OK && err != HTTP_REAUTH) {
+		error("RPC failed; result=%d, HTTP code = %ld",
+		      results->curl_result, results->http_code);
+	}
+
+	return err;
+}
+
+static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
+{
+	struct active_request_slot *slot;
+	struct curl_slist *headers = NULL;
+	struct strbuf buf = STRBUF_INIT;
+	int err;
+
+	slot = get_active_slot();
+
+	headers = curl_slist_append(headers, rpc->hdr_content_type);
+	headers = curl_slist_append(headers, rpc->hdr_accept);
+
+	curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
+	curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
+	curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
+	curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
+	curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
+	curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
+	curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
+	curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
+	curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
+
+	err = run_slot(slot, results);
+
+	curl_slist_free_all(headers);
+	strbuf_release(&buf);
+	return err;
+}
+
+static int post_rpc(struct rpc_state *rpc)
+{
+	struct active_request_slot *slot;
+	struct curl_slist *headers = NULL;
+	int use_gzip = rpc->gzip_request;
+	char *gzip_body = NULL;
+	size_t gzip_size = 0;
+	int err, large_request = 0;
+	int needs_100_continue = 0;
+
+	/* Try to load the entire request, if we can fit it into the
+	 * allocated buffer space we can use HTTP/1.0 and avoid the
+	 * chunked encoding mess.
+	 */
+	while (1) {
+		size_t left = rpc->alloc - rpc->len;
+		char *buf = rpc->buf + rpc->len;
+		int n;
+
+		if (left < LARGE_PACKET_MAX) {
+			large_request = 1;
+			use_gzip = 0;
+			break;
+		}
+
+		n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
+		if (!n)
+			break;
+		rpc->len += n;
+	}
+
+	if (large_request) {
+		struct slot_results results;
+
+		do {
+			err = probe_rpc(rpc, &results);
+			if (err == HTTP_REAUTH)
+				credential_fill(&http_auth);
+		} while (err == HTTP_REAUTH);
+		if (err != HTTP_OK)
+			return -1;
+
+		if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
+			needs_100_continue = 1;
+	}
+
+	headers = curl_slist_append(headers, rpc->hdr_content_type);
+	headers = curl_slist_append(headers, rpc->hdr_accept);
+	headers = curl_slist_append(headers, needs_100_continue ?
+		"Expect: 100-continue" : "Expect:");
+
+retry:
+	slot = get_active_slot();
+
+	curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
+	curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
+	curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
+	curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
+
+	if (large_request) {
+		/* The request body is large and the size cannot be predicted.
+		 * We must use chunked encoding to send it.
+		 */
+		headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
+		rpc->initial_buffer = 1;
+		curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
+		curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
+#ifndef NO_CURL_IOCTL
+		curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
+		curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
+#endif
+		if (options.verbosity > 1) {
+			fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
+			fflush(stderr);
+		}
+
+	} else if (gzip_body) {
+		/*
+		 * If we are looping to retry authentication, then the previous
+		 * run will have set up the headers and gzip buffer already,
+		 * and we just need to send it.
+		 */
+		curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
+		curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
+
+	} else if (use_gzip && 1024 < rpc->len) {
+		/* The client backend isn't giving us compressed data so
+		 * we can try to deflate it ourselves, this may save on.
+		 * the transfer time.
+		 */
+		git_zstream stream;
+		int ret;
+
+		git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
+		gzip_size = git_deflate_bound(&stream, rpc->len);
+		gzip_body = xmalloc(gzip_size);
+
+		stream.next_in = (unsigned char *)rpc->buf;
+		stream.avail_in = rpc->len;
+		stream.next_out = (unsigned char *)gzip_body;
+		stream.avail_out = gzip_size;
+
+		ret = git_deflate(&stream, Z_FINISH);
+		if (ret != Z_STREAM_END)
+			die("cannot deflate request; zlib deflate error %d", ret);
+
+		ret = git_deflate_end_gently(&stream);
+		if (ret != Z_OK)
+			die("cannot deflate request; zlib end error %d", ret);
+
+		gzip_size = stream.total_out;
+
+		headers = curl_slist_append(headers, "Content-Encoding: gzip");
+		curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
+		curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
+
+		if (options.verbosity > 1) {
+			fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
+				rpc->service_name,
+				(unsigned long)rpc->len, (unsigned long)gzip_size);
+			fflush(stderr);
+		}
+	} else {
+		/* We know the complete request size in advance, use the
+		 * more normal Content-Length approach.
+		 */
+		curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
+		curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
+		if (options.verbosity > 1) {
+			fprintf(stderr, "POST %s (%lu bytes)\n",
+				rpc->service_name, (unsigned long)rpc->len);
+			fflush(stderr);
+		}
+	}
+
+	curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
+	curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
+	curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
+
+	err = run_slot(slot, NULL);
+	if (err == HTTP_REAUTH && !large_request) {
+		credential_fill(&http_auth);
+		goto retry;
+	}
+	if (err != HTTP_OK)
+		err = -1;
+
+	curl_slist_free_all(headers);
+	free(gzip_body);
+	return err;
+}
+
+static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
+{
+	const char *svc = rpc->service_name;
+	struct strbuf buf = STRBUF_INIT;
+	struct strbuf *preamble = rpc->stdin_preamble;
+	struct child_process client = CHILD_PROCESS_INIT;
+	int err = 0;
+
+	client.in = -1;
+	client.out = -1;
+	client.git_cmd = 1;
+	client.argv = rpc->argv;
+	if (start_command(&client))
+		exit(1);
+	if (preamble)
+		write_or_die(client.in, preamble->buf, preamble->len);
+	if (heads)
+		write_or_die(client.in, heads->buf, heads->len);
+
+	rpc->alloc = http_post_buffer;
+	rpc->buf = xmalloc(rpc->alloc);
+	rpc->in = client.in;
+	rpc->out = client.out;
+	strbuf_init(&rpc->result, 0);
+
+	strbuf_addf(&buf, "%s%s", url.buf, svc);
+	rpc->service_url = strbuf_detach(&buf, NULL);
+
+	strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
+	rpc->hdr_content_type = strbuf_detach(&buf, NULL);
+
+	strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
+	rpc->hdr_accept = strbuf_detach(&buf, NULL);
+
+	while (!err) {
+		int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
+		if (!n)
+			break;
+		rpc->pos = 0;
+		rpc->len = n;
+		err |= post_rpc(rpc);
+	}
+
+	close(client.in);
+	client.in = -1;
+	if (!err) {
+		strbuf_read(&rpc->result, client.out, 0);
+	} else {
+		char buf[4096];
+		for (;;)
+			if (xread(client.out, buf, sizeof(buf)) <= 0)
+				break;
+	}
+
+	close(client.out);
+	client.out = -1;
+
+	err |= finish_command(&client);
+	free(rpc->service_url);
+	free(rpc->hdr_content_type);
+	free(rpc->hdr_accept);
+	free(rpc->buf);
+	strbuf_release(&buf);
+	return err;
+}
+
+static int fetch_dumb(int nr_heads, struct ref **to_fetch)
+{
+	struct walker *walker;
+	char **targets = xmalloc(nr_heads * sizeof(char*));
+	int ret, i;
+
+	if (options.depth)
+		die("dumb http transport does not support --depth");
+	for (i = 0; i < nr_heads; i++)
+		targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
+
+	walker = get_http_walker(url.buf);
+	walker->get_all = 1;
+	walker->get_tree = 1;
+	walker->get_history = 1;
+	walker->get_verbosely = options.verbosity >= 3;
+	walker->get_recover = 0;
+	ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
+	walker_free(walker);
+
+	for (i = 0; i < nr_heads; i++)
+		free(targets[i]);
+	free(targets);
+
+	return ret ? error("fetch failed.") : 0;
+}
+
+static int fetch_git(struct discovery *heads,
+	int nr_heads, struct ref **to_fetch)
+{
+	struct rpc_state rpc;
+	struct strbuf preamble = STRBUF_INIT;
+	char *depth_arg = NULL;
+	int argc = 0, i, err;
+	const char *argv[17];
+
+	argv[argc++] = "fetch-pack";
+	argv[argc++] = "--stateless-rpc";
+	argv[argc++] = "--stdin";
+	argv[argc++] = "--lock-pack";
+	if (options.followtags)
+		argv[argc++] = "--include-tag";
+	if (options.thin)
+		argv[argc++] = "--thin";
+	if (options.verbosity >= 3) {
+		argv[argc++] = "-v";
+		argv[argc++] = "-v";
+	}
+	if (options.check_self_contained_and_connected)
+		argv[argc++] = "--check-self-contained-and-connected";
+	if (options.cloning)
+		argv[argc++] = "--cloning";
+	if (options.update_shallow)
+		argv[argc++] = "--update-shallow";
+	if (!options.progress)
+		argv[argc++] = "--no-progress";
+	if (options.depth) {
+		struct strbuf buf = STRBUF_INIT;
+		strbuf_addf(&buf, "--depth=%lu", options.depth);
+		depth_arg = strbuf_detach(&buf, NULL);
+		argv[argc++] = depth_arg;
+	}
+	argv[argc++] = url.buf;
+	argv[argc++] = NULL;
+
+	for (i = 0; i < nr_heads; i++) {
+		struct ref *ref = to_fetch[i];
+		if (!*ref->name)
+			die("cannot fetch by sha1 over smart http");
+		packet_buf_write(&preamble, "%s %s\n",
+				 sha1_to_hex(ref->old_sha1), ref->name);
+	}
+	packet_buf_flush(&preamble);
+
+	memset(&rpc, 0, sizeof(rpc));
+	rpc.service_name = "git-upload-pack",
+	rpc.argv = argv;
+	rpc.stdin_preamble = &preamble;
+	rpc.gzip_request = 1;
+
+	err = rpc_service(&rpc, heads);
+	if (rpc.result.len)
+		write_or_die(1, rpc.result.buf, rpc.result.len);
+	strbuf_release(&rpc.result);
+	strbuf_release(&preamble);
+	free(depth_arg);
+	return err;
+}
+
+static int fetch(int nr_heads, struct ref **to_fetch)
+{
+	struct discovery *d = discover_refs("git-upload-pack", 0);
+	if (d->proto_git)
+		return fetch_git(d, nr_heads, to_fetch);
+	else
+		return fetch_dumb(nr_heads, to_fetch);
+}
+
+static void parse_fetch(struct strbuf *buf)
+{
+	struct ref **to_fetch = NULL;
+	struct ref *list_head = NULL;
+	struct ref **list = &list_head;
+	int alloc_heads = 0, nr_heads = 0;
+
+	do {
+		const char *p;
+		if (skip_prefix(buf->buf, "fetch ", &p)) {
+			const char *name;
+			struct ref *ref;
+			unsigned char old_sha1[20];
+
+			if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
+				die("protocol error: expected sha/ref, got %s'", p);
+			if (p[40] == ' ')
+				name = p + 41;
+			else if (!p[40])
+				name = "";
+			else
+				die("protocol error: expected sha/ref, got %s'", p);
+
+			ref = alloc_ref(name);
+			hashcpy(ref->old_sha1, old_sha1);
+
+			*list = ref;
+			list = &ref->next;
+
+			ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
+			to_fetch[nr_heads++] = ref;
+		}
+		else
+			die("http transport does not support %s", buf->buf);
+
+		strbuf_reset(buf);
+		if (strbuf_getline(buf, stdin, '\n') == EOF)
+			return;
+		if (!*buf->buf)
+			break;
+	} while (1);
+
+	if (fetch(nr_heads, to_fetch))
+		exit(128); /* error already reported */
+	free_refs(list_head);
+	free(to_fetch);
+
+	printf("\n");
+	fflush(stdout);
+	strbuf_reset(buf);
+}
+
+static int push_dav(int nr_spec, char **specs)
+{
+	const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
+	int argc = 0, i;
+
+	argv[argc++] = "http-push";
+	argv[argc++] = "--helper-status";
+	if (options.dry_run)
+		argv[argc++] = "--dry-run";
+	if (options.verbosity > 1)
+		argv[argc++] = "--verbose";
+	argv[argc++] = url.buf;
+	for (i = 0; i < nr_spec; i++)
+		argv[argc++] = specs[i];
+	argv[argc++] = NULL;
+
+	if (run_command_v_opt(argv, RUN_GIT_CMD))
+		die("git-%s failed", argv[0]);
+	free(argv);
+	return 0;
+}
+
+static int push_git(struct discovery *heads, int nr_spec, char **specs)
+{
+	struct rpc_state rpc;
+	int i, err;
+	struct argv_array args;
+	struct string_list_item *cas_option;
+	struct strbuf preamble = STRBUF_INIT;
+
+	argv_array_init(&args);
+	argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
+			 NULL);
+
+	if (options.thin)
+		argv_array_push(&args, "--thin");
+	if (options.dry_run)
+		argv_array_push(&args, "--dry-run");
+	if (options.push_cert)
+		argv_array_push(&args, "--signed");
+	if (options.verbosity == 0)
+		argv_array_push(&args, "--quiet");
+	else if (options.verbosity > 1)
+		argv_array_push(&args, "--verbose");
+	argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
+	for_each_string_list_item(cas_option, &cas_options)
+		argv_array_push(&args, cas_option->string);
+	argv_array_push(&args, url.buf);
+
+	argv_array_push(&args, "--stdin");
+	for (i = 0; i < nr_spec; i++)
+		packet_buf_write(&preamble, "%s\n", specs[i]);
+	packet_buf_flush(&preamble);
+
+	memset(&rpc, 0, sizeof(rpc));
+	rpc.service_name = "git-receive-pack",
+	rpc.argv = args.argv;
+	rpc.stdin_preamble = &preamble;
+
+	err = rpc_service(&rpc, heads);
+	if (rpc.result.len)
+		write_or_die(1, rpc.result.buf, rpc.result.len);
+	strbuf_release(&rpc.result);
+	strbuf_release(&preamble);
+	argv_array_clear(&args);
+	return err;
+}
+
+static int push(int nr_spec, char **specs)
+{
+	struct discovery *heads = discover_refs("git-receive-pack", 1);
+	int ret;
+
+	if (heads->proto_git)
+		ret = push_git(heads, nr_spec, specs);
+	else
+		ret = push_dav(nr_spec, specs);
+	free_discovery(heads);
+	return ret;
+}
+
+static void parse_push(struct strbuf *buf)
+{
+	char **specs = NULL;
+	int alloc_spec = 0, nr_spec = 0, i, ret;
+
+	do {
+		if (starts_with(buf->buf, "push ")) {
+			ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
+			specs[nr_spec++] = xstrdup(buf->buf + 5);
+		}
+		else
+			die("http transport does not support %s", buf->buf);
+
+		strbuf_reset(buf);
+		if (strbuf_getline(buf, stdin, '\n') == EOF)
+			goto free_specs;
+		if (!*buf->buf)
+			break;
+	} while (1);
+
+	ret = push(nr_spec, specs);
+	printf("\n");
+	fflush(stdout);
+
+	if (ret)
+		exit(128); /* error already reported */
+
+ free_specs:
+	for (i = 0; i < nr_spec; i++)
+		free(specs[i]);
+	free(specs);
+}
+
 int main(int argc, const char **argv)
 {
-	struct remote *remote;
 	struct strbuf buf = STRBUF_INIT;
-	const char *url;
-	struct walker *walker = NULL;
+	int nongit;
+
+	git_setup_gettext();
 
 	git_extract_argv0_path(argv[0]);
-	setup_git_directory();
+	setup_git_directory_gently(&nongit);
 	if (argc < 2) {
-		fprintf(stderr, "Remote needed\n");
+		error("remote-curl: usage: git remote-curl <remote> [<url>]");
 		return 1;
 	}
 
+	options.verbosity = 1;
+	options.progress = !!isatty(2);
+	options.thin = 1;
+
 	remote = remote_get(argv[1]);
 
 	if (argc > 2) {
-		url = argv[2];
+		end_url_with_slash(&url, argv[2]);
 	} else {
-		url = remote->url[0];
+		end_url_with_slash(&url, remote->url[0]);
 	}
 
+	http_init(remote, url.buf, 0);
+
 	do {
-		if (strbuf_getline(&buf, stdin, '\n') == EOF)
+		const char *arg;
+
+		if (strbuf_getline(&buf, stdin, '\n') == EOF) {
+			if (ferror(stdin))
+				error("remote-curl: error reading command stream from git");
+			return 1;
+		}
+		if (buf.len == 0)
 			break;
-		if (!prefixcmp(buf.buf, "fetch ")) {
-			char *obj = buf.buf + strlen("fetch ");
-			if (!walker)
-				walker = get_http_walker(url, remote);
-			walker->get_all = 1;
-			walker->get_tree = 1;
-			walker->get_history = 1;
-			walker->get_verbosely = 0;
-			walker->get_recover = 0;
-			if (walker_fetch(walker, 1, &obj, NULL, NULL))
-				die("Fetch failed.");
-			printf("\n");
-			fflush(stdout);
-		} else if (!strcmp(buf.buf, "list")) {
-			struct ref *refs;
-			struct ref *posn;
-			if (!walker)
-				walker = get_http_walker(url, remote);
-			refs = get_refs(walker, url);
-			for (posn = refs; posn; posn = posn->next) {
-				if (posn->symref)
-					printf("@%s %s\n", posn->symref, posn->name);
-				else
-					printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
-			}
-			printf("\n");
+		if (starts_with(buf.buf, "fetch ")) {
+			if (nongit)
+				die("remote-curl: fetch attempted without a local repo");
+			parse_fetch(&buf);
+
+		} else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
+			int for_push = !!strstr(buf.buf + 4, "for-push");
+			output_refs(get_refs(for_push));
+
+		} else if (starts_with(buf.buf, "push ")) {
+			parse_push(&buf);
+
+		} else if (skip_prefix(buf.buf, "option ", &arg)) {
+			char *value = strchr(arg, ' ');
+			int result;
+
+			if (value)
+				*value++ = '\0';
+			else
+				value = "true";
+
+			result = set_option(arg, value);
+			if (!result)
+				printf("ok\n");
+			else if (result < 0)
+				printf("error invalid value\n");
+			else
+				printf("unsupported\n");
 			fflush(stdout);
+
 		} else if (!strcmp(buf.buf, "capabilities")) {
 			printf("fetch\n");
+			printf("option\n");
+			printf("push\n");
+			printf("check-connectivity\n");
 			printf("\n");
 			fflush(stdout);
 		} else {
+			error("remote-curl: unknown command '%s' from git", buf.buf);
 			return 1;
 		}
 		strbuf_reset(&buf);
 	} while (1);
+
+	http_cleanup();
+
 	return 0;
 }