nits

Dockerfile

@@ -28,7 +28,7 @@ RUN set -ex; \
 ### Minimal run-time image
 FROM alpine:3.9
 
-RUN apk add --no-cache msgpack-c ncurses-libs libevent libexecinfo openssl zlib
+RUN apk add --no-cache msgpack-c ncurses-libs libevent libexecinfo openssl zlib gdb bash
 
 COPY --from=build /usr/lib/libssh.so.* /usr/lib/
 COPY --from=build /usr/bin/tmate-ssh-server /usr/bin/

server.c

@@ -222,7 +222,8 @@ server_loop(void)
 		 * This causes an infinite loop.
 		 * The following check is a workaround to avoid the infinite loop.
 		 */
-		tmate_fatal("SSH socket not connected, but socket close wasn't detected");
+		tmate_info("SSH socket not connected, but socket close wasn't detected");
+		request_server_termination();
 	}
 
 	if (!tmate_server_request_exit)

tmate-daemon-decoder.c

@@ -45,7 +45,7 @@ static void tmate_header(struct tmate_session *session,
 		session->daemon_encoder.mpac_version = 4;
 	}
 
-	tmate_info("Daemon header: version=%s, protocol=%d",
+	tmate_info("tmate version=%s, protocol=%d",
 		   session->client_version, session->client_protocol_version);
 
 	if (tmate_has_websocket()) {

tmate-main.c

@@ -174,7 +174,7 @@ char *get_socket_path(const char *_token)
 
 	for (char *c = token; *c; c++) {
 		if (*c == '/' || *c == '.')
-			*c = '_';
+			*c = '=';
 	}
 
 	xasprintf(&path, TMATE_WORKDIR "/sessions/%s", token);

tmate-ssh-daemon.c

@@ -156,8 +156,7 @@ void tmate_spawn_daemon(struct tmate_session *session)
 	set_session_token(session, token);
 	free(token);
 
-	tmate_info("Spawning daemon username=%s ip=%s",
-		    client->username, client->ip_address);
+	tmate_info("Spawning daemon ip=%s", client->ip_address);
 
 	session->tmux_socket_fd = server_create_socket();
 	if (session->tmux_socket_fd < 0)