diff --git a/sys/bootstrap/CMakeLists.txt b/sys/bootstrap/CMakeLists.txt
index 0903b22..5381979 100644
--- a/sys/bootstrap/CMakeLists.txt
+++ b/sys/bootstrap/CMakeLists.txt
@@ -5,7 +5,7 @@ set_property(SOURCE ${arch_sources} PROPERTY LANGUAGE C)
 
 add_executable(bootstrap ${c_sources} ${arch_sources})
 
-target_link_libraries(bootstrap libmango ulibc liblaunch)
+target_link_libraries(bootstrap libmango ulibc liblaunch libmsg-fs)
 
 target_compile_options(bootstrap PRIVATE
 	-fPIC -pie -fno-stack-protector -nostdlib -ffreestanding)
diff --git a/sys/bootstrap/main.c b/sys/bootstrap/main.c
index 7666fa9..56960e1 100644
--- a/sys/bootstrap/main.c
+++ b/sys/bootstrap/main.c
@@ -5,9 +5,10 @@
 #include <mango/msg.h>
 #include <mango/task.h>
 #include <mango/types.h>
+#include <rosetta/msg.h>
+#include <rosetta/msg/fs.h>
 #include <stdint.h>
 #include <stdio.h>
-#include <string.h>
 
 #define INIT_PATH "/usr/bin/test"
 
@@ -98,27 +99,47 @@ int main(
 	kern_logf("launch result: %d", status);
 
 #if 1
-	char msg_buf[512];
-	struct iovec vec = {
-		.io_base = (virt_addr_t)msg_buf,
-		.io_len = sizeof msg_buf,
-	};
-	struct msg msg = {.msg_data = &vec, .msg_data_count = 1};
 
 	while (1) {
-		msgid_t id = 0;
-		kern_status_t kstatus = msg_recv(channel, 0, &id, &msg);
-		if (kstatus != KERN_OK) {
-			kern_logf("msg_recv failed %d", kstatus);
-			break;
+		msgid_t id;
+		struct rosetta_msg msg;
+		kern_status_t status = rosetta_msg_recv(channel, &id, &msg);
+		if (status != KERN_OK) {
+			kern_logf("message recv error %d", status);
+			continue;
 		}
 
-		kern_logf("received message %zx: %s", id, msg_buf);
+		if (msg.msg_protocol != ROSETTA_MSG_FS) {
+			kern_logf(
+				"unknown message protocol %u",
+				msg.msg_protocol);
+			continue;
+		}
 
-		size_t len = snprintf(msg_buf, sizeof msg_buf, "Goodbye!");
-		vec.io_len = len + 1;
+		if (msg.msg_id != ROSETTA_MSG_FS_OPEN) {
+			kern_logf("unknown message function %u", msg.msg_id);
+			continue;
+		}
 
-		msg_reply(channel, 0, id, &msg);
+		char path[4096];
+		int flags;
+		struct rosetta_msg_string path_str = {
+			.s_buf = path,
+			.s_max = sizeof path,
+		};
+		status = rosetta_msg_fs_open_recv(
+			channel,
+			id,
+			&path_str,
+			&flags);
+		if (status != KERN_OK) {
+			kern_logf("rosetta.fs.open recv error %d", status);
+			continue;
+		}
+
+		kern_logf("open(%s, %d)", path, flags);
+
+		rosetta_msg_fs_open_reply(channel, id, 0);
 	}
 #endif