connect: split git:// setup into a separate function

The git_connect function is growing long.  Split the
PROTO_GIT-specific portion to a separate function to make it easier to
read.

No functional change intended.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Reviewed-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: jrn

connect.c

@@ -861,6 +861,64 @@ static enum ssh_variant determine_ssh_variant(const char *ssh_command,
 	return ssh_variant;
 }
 
+/*
+ * Open a connection using Git's native protocol.
+ *
+ * The caller is responsible for freeing hostandport, but this function may
+ * modify it (for example, to truncate it to remove the port part).
+ */
+static struct child_process *git_connect_git(int fd[2], char *hostandport,
+					     const char *path, const char *prog,
+					     int flags)
+{
+	struct child_process *conn;
+	struct strbuf request = STRBUF_INIT;
+	/*
+	 * Set up virtual host information based on where we will
+	 * connect, unless the user has overridden us in
+	 * the environment.
+	 */
+	char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
+	if (target_host)
+		target_host = xstrdup(target_host);
+	else
+		target_host = xstrdup(hostandport);
+
+	transport_check_allowed("git");
+
+	/* These underlying connection commands die() if they
+	 * cannot connect.
+	 */
+	if (git_use_proxy(hostandport))
+		conn = git_proxy_connect(fd, hostandport);
+	else
+		conn = git_tcp_connect(fd, hostandport, flags);
+	/*
+	 * Separate original protocol components prog and path
+	 * from extended host header with a NUL byte.
+	 *
+	 * Note: Do not add any other headers here!  Doing so
+	 * will cause older git-daemon servers to crash.
+	 */
+	strbuf_addf(&request,
+		    "%s %s%chost=%s%c",
+		    prog, path, 0,
+		    target_host, 0);
+
+	/* If using a new version put that stuff here after a second null byte */
+	if (get_protocol_version_config() > 0) {
+		strbuf_addch(&request, '\0');
+		strbuf_addf(&request, "version=%d%c",
+			    get_protocol_version_config(), '\0');
+	}
+
+	packet_write(fd[1], request.buf, request.len);
+
+	free(target_host);
+	strbuf_release(&request);
+	return conn;
+}
+
 /*
  * This returns the dummy child_process `no_fork` if the transport protocol
  * does not need fork(2), or a struct child_process object if it does.  Once
@@ -892,50 +950,7 @@ struct child_process *git_connect(int fd[2], const char *url,
 		printf("Diag: path=%s\n", path ? path : "NULL");
 		conn = NULL;
 	} else if (protocol == PROTO_GIT) {
-		struct strbuf request = STRBUF_INIT;
-		/*
-		 * Set up virtual host information based on where we will
-		 * connect, unless the user has overridden us in
-		 * the environment.
-		 */
-		char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
-		if (target_host)
-			target_host = xstrdup(target_host);
-		else
-			target_host = xstrdup(hostandport);
-
-		transport_check_allowed("git");
-
-		/* These underlying connection commands die() if they
-		 * cannot connect.
-		 */
-		if (git_use_proxy(hostandport))
-			conn = git_proxy_connect(fd, hostandport);
-		else
-			conn = git_tcp_connect(fd, hostandport, flags);
-		/*
-		 * Separate original protocol components prog and path
-		 * from extended host header with a NUL byte.
-		 *
-		 * Note: Do not add any other headers here!  Doing so
-		 * will cause older git-daemon servers to crash.
-		 */
-		strbuf_addf(&request,
-			    "%s %s%chost=%s%c",
-			    prog, path, 0,
-			    target_host, 0);
-
-		/* If using a new version put that stuff here after a second null byte */
-		if (get_protocol_version_config() > 0) {
-			strbuf_addch(&request, '\0');
-			strbuf_addf(&request, "version=%d%c",
-				    get_protocol_version_config(), '\0');
-		}
-
-		packet_write(fd[1], request.buf, request.len);
-
-		free(target_host);
-		strbuf_release(&request);
+		conn = git_connect_git(fd, hostandport, path, prog, flags);
 	} else {
 		struct strbuf cmd = STRBUF_INIT;
 		const char *const *var;