Use of a Linux initramfs to fully automate the bootstrapping process
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#!/usr/bin/env python3
This file contains a few self-contained helper functions
# SPDX-License-Identifier: GPL-3.0-or-later
# SPDX-FileCopyrightText: 2021 Andrius Štikonas <>
# SPDX-FileCopyrightText: 2021 fosslinux <>
import os
import shutil
import subprocess
import sys
def run(*args, **kwargs):
"""A small wrapper around"""
arguments = [str(arg) for arg in args]
if kwargs.pop('verbose', False):
return, check=True, **kwargs)
except subprocess.CalledProcessError:
print("Bootstrapping failed")
def create_disk(image, disk_type, fs_type, size):
"""Create a disk image, with a filesystem on it"""
run('truncate', '-s', size, image)
# First find the device we will use, then actually use it
loop_dev = run('losetup', '-f', capture_output=True).stdout.decode().strip()
run('sudo', 'losetup', loop_dev, image)
# Create the partition
run('sudo', 'parted', '--script', image, 'mklabel', disk_type, 'mkpart',
'primary', 'ext4', '0%', '100%')
run('sudo', 'partprobe', loop_dev)
run('sudo', 'mkfs.' + fs_type, loop_dev + "p1")
return loop_dev
def mount(source, target, fs_type, options='', **kwargs):
"""Mount filesystem"""
run('sudo', 'mount', source, target, '-t', fs_type, '-o', options, **kwargs)
def umount(target, **kwargs):
"""Unmount filesystem"""
run('sudo', 'umount', target, **kwargs)
def copytree(src, dst, ignore=shutil.ignore_patterns('*.git*')):
"""Copy directory tree into another directory"""
file_name = os.path.basename(src)
shutil.copytree(src, os.path.join(dst, file_name), ignore=ignore)
def get_target(file_name):
"""Determine package installation directory"""
bname = os.path.basename(file_name)
# Remove file extension. This is not completely trivial because
# tar archives often come with double extensions.
first_ext = os.path.splitext(os.path.basename(bname))
second_ext = os.path.splitext(first_ext[0])
if second_ext[1] == '.tar':
bname = second_ext[0]
bname = first_ext[0]
return bname