| #!/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()) |