Flush stdout before bootstrap

.github/workflows/qemu.yml

@@ -51,7 +51,7 @@ jobs:
       - name: Remount package disk
         if: always()
         run: >
-          DEV=$(sudo losetup -f target/external.img) &&
+          DEV=$(sudo losetup -f --show target/external.img) &&
           sudo partprobe ${DEV}p1 &&
           mkdir -p mnt &&
           sudo mount ${DEV}p1 mnt

lib/utils.py

@@ -19,6 +19,9 @@ def run(*args, cleanup=None, **kwargs):
     if kwargs.pop('verbose', False):
         print(arguments)
 
+    sys.stdout.flush()
+    sys.stderr.flush()
+
     try:
         return subprocess.run(arguments, check=True, **kwargs)
     except subprocess.CalledProcessError:

rootfs.py

@@ -17,6 +17,7 @@ you can run bootstap inside chroot.
 import argparse
 import os
 import signal
+import sys
 import threading
 
 from lib.generator import Generator, stage0_arch_map