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live-bootstrap
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Add a rootless bootstrap mode using bubblewrap 

Set up a bubblewrap sandbox suitable for bootstrap. Since bubblewrap
can operate without root permissions when user namespaces are
allowed, this effectively adds a rootless bootstrap mode.
This commit is contained in:
Dor Askayo 2021-12-25 20:19:01 +02:00
parent 8330ab4504
commit 1e67477ff2
2 changed files with 42 additions and 3 deletions
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6
README.rst
View File

@ -23,13 +23,15 @@ Get me started!
installed.
a. Alternatively, run ``./rootfs.py --chroot`` to run it in a chroot.
b. Alternatively, run ``./rootfs.py`` but don’t run the actual
b. Alternatively, run ``./rootfs.py --bwrap`` to run it in a bubblewrap
sandbox. When user namespaces are supported, this mode is rootless.
c. Alternatively, run ``./rootfs.py`` but don’t run the actual
virtualization and instead copy sysa/tmp/initramfs to a USB or
some other device and boot from bare metal. NOTE: we now require
a hard drive. This is currently hardcoded as sda. You also need
to put ``sysc/tmp/disk.img`` onto your sda on the bootstrapping
machine.
c. Alternatively, do not use python at all, see "Python-less build"
d. Alternatively, do not use python at all, see "Python-less build"
below.
5. Wait.

39
rootfs.py
View File

@ -7,6 +7,7 @@ you can run bootstap inside chroot.
"""
# SPDX-License-Identifier: GPL-3.0-or-later
# SPDX-FileCopyrightText: 2022 Dor Askayo <dor.askayo@gmail.com>
# SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
# SPDX-FileCopyrightText: 2021 Bastian Bittorf <bb@npl.de>
# SPDX-FileCopyrightText: 2021 Melg Eight <public.melg8@gmail.com>
@ -30,7 +31,7 @@ def create_configuration_file(args):
config_path = os.path.join('sysa', 'bootstrap.cfg')
with open(config_path, "w", encoding="utf_8") as config:
config.write("FORCE_TIMESTAMPS=" + str(args.force_timestamps) + "\n")
config.write("CHROOT=" + str(args.chroot) + "\n")
config.write("CHROOT=" + str(args.chroot or args.bwrap) + "\n")
config.write("UPDATE_CHECKSUMS=" + str(args.update_checksums) + "\n")
config.write("DISK=sda1\n")
@ -45,6 +46,8 @@ def main():
default="x86")
parser.add_argument("-c", "--chroot", help="Run inside chroot",
action="store_true")
parser.add_argument("-bw", "--bwrap", help="Run inside a bwrap sandbox",
action="store_true")
parser.add_argument("-p", "--preserve", help="Do not remove temporary dir",
action="store_true")
parser.add_argument("-t", "--tmpdir", help="Temporary directory")
@ -81,6 +84,8 @@ def main():
count += 1
if args.chroot:
count += 1
if args.bwrap:
count += 1
if args.minikernel:
count += 1
if args.bare_metal:
@ -139,6 +144,38 @@ print(shutil.which('chroot'))
init = os.path.join(os.sep, 'bootstrap-seeds', 'POSIX', arch, 'kaem-optional-seed')
run('sudo', 'env', '-i', 'PATH=/bin', chroot_binary, system_a.tmp_dir, init)
elif args.bwrap:
system_c.prepare(mount_tmpfs=False,
create_disk_image=False)
system_a.prepare(mount_tmpfs=False,
copy_sysc=True,
create_initramfs=False)
# sysa
arch = stage0_arch_map.get(args.arch, args.arch)
init = os.path.join(os.sep, 'bootstrap-seeds', 'POSIX', arch, 'kaem-optional-seed')
run('bwrap', '--unshare-user',
'--uid', '0',
'--gid', '0',
'--cap-add', 'CAP_SYS_CHROOT', # Required for chroot from sysa to sysc
'--clearenv',
'--setenv', 'PATH', '/usr/bin',
'--bind', system_a.tmp_dir, '/',
'--dir', '/dev',
'--dev-bind', '/dev/null', '/dev/null',
'--dev-bind', '/dev/zero', '/dev/zero',
'--dev-bind', '/dev/random', '/dev/random',
'--dev-bind', '/dev/urandom', '/dev/urandom',
'--dir', '/sysc/dev',
'--dev-bind', '/dev/null', '/sysc/dev/null',
'--dev-bind', '/dev/zero', '/sysc/dev/zero',
'--dev-bind', '/dev/random', '/sysc/dev/random',
'--dev-bind', '/dev/urandom', '/sysc/dev/urandom',
'--proc', '/sysc/proc',
'--bind', '/sys', '/sysc/sys',
'--tmpfs', '/sysc/tmp',
init)
elif args.minikernel:
if os.path.isdir('kritis-linux'):
shutil.rmtree('kritis-linux')