blob: 06f6502c7144b000f86191c239c56e70aaeaa18b [file] [log] [blame]
#!/usr/bin/env python
#
# Copyright 2019 The Hafnium Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Generate an initial RAM disk for a Linux VM."""
import argparse
import os
import shutil
import subprocess
import sys
def Main():
parser = argparse.ArgumentParser()
parser.add_argument("--staging", required=True)
parser.add_argument("--output", required=True)
args = parser.parse_args()
# Package files into an initial RAM disk.
with open(args.output, "w") as initrd:
# Move into the staging directory so the file names taken by cpio don't
# include the path.
os.chdir(args.staging)
staged_files = [os.path.join(root, filename)
for (root, dirs, files) in os.walk(".") for filename in files + dirs]
cpio = subprocess.Popen(
["cpio", "--create", "--format=newc"],
stdin=subprocess.PIPE,
stdout=initrd,
stderr=subprocess.PIPE)
cpio.communicate(input="\n".join(staged_files).encode("utf-8"))
return 0
if __name__ == "__main__":
sys.exit(Main())