virtme/commands/mkinitramfs.py

# -*- mode: python -*-
# virtme-mkinitramfs: Generate an initramfs image for virtme
# Copyright © 2014 Andy Lutomirski
# Licensed under the GPLv2, which is available in the virtme distribution
# as a file called LICENSE with SHA-256 hash:
# 8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643

import argparse
from .. import modfinder
from .. import virtmods
from .. import mkinitramfs

def make_parser():
    parser = argparse.ArgumentParser(
        description='Generate an initramfs image for virtme',
    )

    parser.add_argument('--mod-kversion', action='store', default=None,
                        help='Find kernel modules related to kernel version set')

    parser.add_argument('--rw', action='store_true', default=False,
                        help='Mount initramfs as rw. Default is ro')

    parser.add_argument('--outfile', action='store', default=None,
                        help='Filename of the resulting initramfs file. Default: send initramfs to stdout')

    return parser

def main():
    import sys

    args = make_parser().parse_args()

    config = mkinitramfs.Config()

    if args.mod_kversion is not None:
        config.modfiles = modfinder.find_modules_from_install(
            virtmods.MODALIASES, kver=args.mod_kversion)

    # search for busybox in the root filesystem
    config.busybox = mkinitramfs.find_busybox(root = '/', is_native = True)

    if args.rw:
        config.access = 'rw'

    if args.outfile is None:
        buf = sys.stdout.buffer
    else:
        buf = open(args.outfile, 'w+b')

    mkinitramfs.mkinitramfs(buf, config)

    return 0

if __name__ == '__main__':
    exit(main())