serve.[ch]: remove "serve_options", split up --advertise-refs code

The "advertise capabilities" mode of serve.c added in
ed10cb952d (serve: introduce git-serve, 2018-03-15) is only used by
the http-backend.c to call {upload,receive}-pack with the
--advertise-refs parameter. See 42526b478e (Add stateless RPC options
to upload-pack, receive-pack, 2009-10-30).

Let's just make cmd_upload_pack() take the two (v2) or three (v2)
parameters the the v2/v1 servicing functions need directly, and pass
those in via the function signature. The logic of whether daemon mode
is implied by the timeout belongs in the v1 function (only used
there).

Once we split up the "advertise v2 refs" from "serve v2 request" it
becomes clear that v2 never cared about those in combination. The only
time it mattered was for v1 to emit its ref advertisement, in that
case we wanted to emit the smart-http-only "no-done" capability.

Since we only do that in the --advertise-refs codepath let's just have
it set "do_done" itself in v1's upload_pack() just before send_ref(),
at that point --advertise-refs and --stateless-rpc in combination are
redundant (the only user is get_info_refs() in http-backend.c), so we
can just pass in --advertise-refs only.

Since we need to touch all the serve() and advertise_capabilities()
codepaths let's rename them to less clever and obvious names, it's
been suggested numerous times, the latest of which is [1]'s suggestion
for protocol_v2_serve_loop(). Let's go with that.

1. https://lore.kernel.org/git/CAFQ2z_NyGb8rju5CKzmo6KhZXD0Dp21u-BbyCb2aNxLEoSPRJw@mail.gmail.com/

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/upload-pack.c

@@ -16,16 +16,17 @@ int cmd_upload_pack(int argc, const char **argv, const char *prefix)
 {
 	const char *dir;
 	int strict = 0;
-	struct upload_pack_options opts = { 0 };
-	struct serve_options serve_opts = SERVE_OPTIONS_INIT;
+	int advertise_refs = 0;
+	int stateless_rpc = 0;
+	int timeout = 0;
 	struct option options[] = {
-		OPT_BOOL(0, "stateless-rpc", &opts.stateless_rpc,
+		OPT_BOOL(0, "stateless-rpc", &stateless_rpc,
 			 N_("quit after a single request/response exchange")),
-		OPT_BOOL(0, "advertise-refs", &opts.advertise_refs,
+		OPT_BOOL(0, "advertise-refs", &advertise_refs,
 			 N_("exit immediately after initial ref advertisement")),
 		OPT_BOOL(0, "strict", &strict,
 			 N_("do not try <directory>/.git/ if <directory> is no Git directory")),
-		OPT_INTEGER(0, "timeout", &opts.timeout,
+		OPT_INTEGER(0, "timeout", &timeout,
 			    N_("interrupt transfer after <n> seconds of inactivity")),
 		OPT_END()
 	};
@@ -38,9 +39,6 @@ int cmd_upload_pack(int argc, const char **argv, const char *prefix)
 	if (argc != 1)
 		usage_with_options(upload_pack_usage, options);
 
-	if (opts.timeout)
-		opts.daemon_mode = 1;
-
 	setup_path();
 
 	dir = argv[0];
@@ -50,21 +48,22 @@ int cmd_upload_pack(int argc, const char **argv, const char *prefix)
 
 	switch (determine_protocol_version_server()) {
 	case protocol_v2:
-		serve_opts.advertise_capabilities = opts.advertise_refs;
-		serve_opts.stateless_rpc = opts.stateless_rpc;
-		serve(&serve_opts);
+		if (advertise_refs)
+			protocol_v2_advertise_capabilities();
+		else
+			protocol_v2_serve_loop(stateless_rpc);
 		break;
 	case protocol_v1:
 		/*
 		 * v1 is just the original protocol with a version string,
 		 * so just fall through after writing the version string.
 		 */
-		if (opts.advertise_refs || !opts.stateless_rpc)
+		if (advertise_refs || !stateless_rpc)
 			packet_write_fmt(1, "version 1\n");
 
 		/* fallthrough */
 	case protocol_v0:
-		upload_pack(&opts);
+		upload_pack(advertise_refs, stateless_rpc, timeout);
 		break;
 	case protocol_unknown_version:
 		BUG("unknown protocol version");

http-backend.c

@@ -534,7 +534,7 @@ static void get_info_refs(struct strbuf *hdr, char *arg)
 
 	if (service_name) {
 		const char *argv[] = {NULL /* service name */,
-			"--stateless-rpc", "--advertise-refs",
+			"--advertise-refs",
 			".", NULL};
 		struct rpc_service *svc = select_service(hdr, service_name);
 

serve.c

@@ -106,7 +106,7 @@ static struct protocol_capability capabilities[] = {
 	},
 };
 
-static void advertise_capabilities(void)
+void protocol_v2_advertise_capabilities(void)
 {
 	struct strbuf capability = STRBUF_INIT;
 	struct strbuf value = STRBUF_INIT;
@@ -303,24 +303,16 @@ static int process_request(void)
 	return 0;
 }
 
-/* Main serve loop for protocol version 2 */
-void serve(struct serve_options *options)
+void protocol_v2_serve_loop(int stateless_rpc)
 {
-	if (options->advertise_capabilities || !options->stateless_rpc) {
-		advertise_capabilities();
-		/*
-		 * If only the list of capabilities was requested exit
-		 * immediately after advertising capabilities
-		 */
-		if (options->advertise_capabilities)
-			return;
-	}
+	if (!stateless_rpc)
+		protocol_v2_advertise_capabilities();
 
 	/*
 	 * If stateless-rpc was requested then exit after
 	 * a single request/response exchange
 	 */
-	if (options->stateless_rpc) {
+	if (stateless_rpc) {
 		process_request();
 	} else {
 		for (;;)

serve.h

@@ -1,11 +1,7 @@
 #ifndef SERVE_H
 #define SERVE_H
 
-struct serve_options {
-	unsigned advertise_capabilities;
-	unsigned stateless_rpc;
-};
-#define SERVE_OPTIONS_INIT { 0 }
-void serve(struct serve_options *options);
+void protocol_v2_advertise_capabilities(void);
+void protocol_v2_serve_loop(int stateless_rpc);
 
 #endif /* SERVE_H */

t/helper/test-serve-v2.c

@@ -10,12 +10,12 @@ static char const * const serve_usage[] = {
 
 int cmd__serve_v2(int argc, const char **argv)
 {
-	struct serve_options opts = SERVE_OPTIONS_INIT;
-
+	int stateless_rpc = 0;
+	int advertise_capabilities = 0;
 	struct option options[] = {
-		OPT_BOOL(0, "stateless-rpc", &opts.stateless_rpc,
+		OPT_BOOL(0, "stateless-rpc", &stateless_rpc,
 			 N_("quit after a single request/response exchange")),
-		OPT_BOOL(0, "advertise-capabilities", &opts.advertise_capabilities,
+		OPT_BOOL(0, "advertise-capabilities", &advertise_capabilities,
 			 N_("exit immediately after advertising capabilities")),
 		OPT_END()
 	};
@@ -25,7 +25,11 @@ int cmd__serve_v2(int argc, const char **argv)
 	argc = parse_options(argc, argv, prefix, options, serve_usage,
 			     PARSE_OPT_KEEP_DASHDASH |
 			     PARSE_OPT_KEEP_UNKNOWN);
-	serve(&opts);
+
+	if (advertise_capabilities)
+		protocol_v2_advertise_capabilities();
+	else
+		protocol_v2_serve_loop(stateless_rpc);
 
 	return 0;
 }

upload-pack.c

@@ -1214,7 +1214,7 @@ static int send_ref(const char *refname, const struct object_id *oid,
 				     " allow-tip-sha1-in-want" : "",
 			     (data->allow_uor & ALLOW_REACHABLE_SHA1) ?
 				     " allow-reachable-sha1-in-want" : "",
-			     data->stateless_rpc ? " no-done" : "",
+			     data->no_done ? " no-done" : "",
 			     symref_info.buf,
 			     data->allow_filter ? " filter" : "",
 			     session_id.buf,
@@ -1329,7 +1329,8 @@ static int upload_pack_config(const char *var, const char *value, void *cb_data)
 	return parse_hide_refs_config(var, value, "uploadpack");
 }
 
-void upload_pack(struct upload_pack_options *options)
+void upload_pack(const int advertise_refs, const int stateless_rpc,
+		 const int timeout)
 {
 	struct packet_reader reader;
 	struct upload_pack_data data;
@@ -1338,14 +1339,17 @@ void upload_pack(struct upload_pack_options *options)
 
 	git_config(upload_pack_config, &data);
 
-	data.stateless_rpc = options->stateless_rpc;
-	data.daemon_mode = options->daemon_mode;
-	data.timeout = options->timeout;
+	data.stateless_rpc = stateless_rpc;
+	data.timeout = timeout;
+	if (data.timeout)
+		data.daemon_mode = 1;
 
 	head_ref_namespaced(find_symref, &data.symref);
 
-	if (options->advertise_refs || !data.stateless_rpc) {
+	if (advertise_refs || !data.stateless_rpc) {
 		reset_timeout(data.timeout);
+		if (advertise_refs)
+			data.no_done = 1;
 		head_ref_namespaced(send_ref, &data);
 		for_each_namespaced_ref(send_ref, &data);
 		advertise_shallow_grafts(1);
@@ -1355,7 +1359,7 @@ void upload_pack(struct upload_pack_options *options)
 		for_each_namespaced_ref(check_ref, NULL);
 	}
 
-	if (!options->advertise_refs) {
+	if (!advertise_refs) {
 		packet_reader_init(&reader, 0, NULL, 0,
 				   PACKET_READ_CHOMP_NEWLINE |
 				   PACKET_READ_DIE_ON_ERR_PACKET);

upload-pack.h

@@ -1,14 +1,8 @@
 #ifndef UPLOAD_PACK_H
 #define UPLOAD_PACK_H
 
-struct upload_pack_options {
-	int stateless_rpc;
-	int advertise_refs;
-	unsigned int timeout;
-	int daemon_mode;
-};
-
-void upload_pack(struct upload_pack_options *options);
+void upload_pack(const int advertise_refs, const int stateless_rpc,
+		 const int timeout);
 
 struct repository;
 struct packet_reader;