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# Copyright (c) Meta Platforms, Inc. and affiliates.
# SPDX-License-Identifier: LGPL-2.1-or-later
import logging
from pathlib import Path
import subprocess
import tempfile
from typing import Literal, Optional, TextIO
from vmtest.config import ARCHITECTURES, HOST_ARCHITECTURE, Architecture
logger = logging.getLogger(__name__)
_ROOTFS_PACKAGES = [
# drgn build dependencies.
"autoconf",
"automake",
"gcc",
"git",
"libdw-dev",
"libelf-dev",
"libkdumpfile-dev",
"liblzma-dev",
"libtool",
"make",
"pkgconf",
"python3",
"python3-dev",
"python3-pip",
"python3-setuptools",
# Test dependencies.
"btrfs-progs",
"check",
"e2fsprogs",
"iproute2",
"kexec-tools",
"kmod",
"python3-pyroute2",
"python3-pytest",
"python3-pytest-subtests",
"zstd",
]
def build_rootfs(
arch: Architecture,
path: Path,
*,
btrfs: Literal["never", "always", "auto"] = "auto",
) -> None:
if path.exists():
logger.info("%s already exists", path)
return
logger.info("creating debootstrap rootfs %s", path)
path.parent.mkdir(parents=True, exist_ok=True)
with tempfile.TemporaryDirectory(dir=path.parent) as tmp_name:
tmp_dir = Path(tmp_name)
snapshot = False
if btrfs != "never":
try:
import btrfsutil # type: ignore # No type hints available.
btrfsutil.create_subvolume(tmp_dir / path.name)
snapshot = True
except (ImportError, OSError):
if btrfs == "always":
raise
subprocess.check_call(
[
"unshare",
"--map-root-user",
"--map-users=auto",
"--map-groups=auto",
"sh",
"-c",
r"""
set -e
arch="$1"
target="$2"
packages="$3"
# We're not really an LXC container, but this convinces debootstrap to skip
# some operations that it can't do in a user namespace.
export container=lxc
debootstrap --variant=minbase --foreign --include="$packages" --arch="$arch" stable "$target"
chroot "$target" /debootstrap/debootstrap --second-stage
chroot "$target" apt clean
""",
"sh",
arch.debian_arch,
tmp_dir / path.name,
",".join(_ROOTFS_PACKAGES),
]
)
(tmp_dir / path.name).rename(path)
logger.info("created debootstrap rootfs %s", path)
if snapshot:
snapshot_dir = path.parent / (path.name + ".pristine")
btrfsutil.create_snapshot(path, snapshot_dir, read_only=True)
logger.info("created snapshot %s", snapshot_dir)
def build_drgn_in_rootfs(rootfs: Path, outfile: Optional[TextIO] = None) -> None:
logger.info("building drgn using %s", rootfs)
subprocess.check_call(
[
"unshare",
"--mount",
"--map-root-user",
"--map-users=auto",
"--map-groups=auto",
"sh",
"-c",
r"""
set -e
mount --bind . "$1/mnt"
chroot "$1" sh -c 'cd /mnt && CONFIGURE_FLAGS=--enable-compiler-warnings=error python3 setup.py build_ext -i'
""",
"sh",
rootfs,
],
stdout=outfile,
stderr=outfile,
)
if __name__ == "__main__":
import argparse
logging.basicConfig(
format="%(asctime)s:%(levelname)s:%(name)s:%(message)s", level=logging.INFO
)
parser = argparse.ArgumentParser(
description="build root filesystems for vmtest. "
"This requires debootstrap(8), qemu-user-static, and unprivileged user namespaces.",
formatter_class=argparse.ArgumentDefaultsHelpFormatter,
)
parser.add_argument(
"-d",
"--directory",
metavar="DIR",
type=Path,
default="build/vmtest",
help="directory for vmtest artifacts",
)
parser.add_argument(
"--build-drgn",
action="store_true",
help="also build drgn in the current directory using the built rootfs",
)
parser.add_argument(
"--btrfs",
choices=["never", "always", "auto"],
default="auto",
help="make the rootfs a Btrfs subvolume and create a read-only snapshot",
)
parser.add_argument(
"-a",
"--architecture",
dest="architectures",
action="append",
choices=["all", "foreign", *sorted(ARCHITECTURES)],
default=argparse.SUPPRESS,
help='architecture to build for, or "foreign" for all architectures other than the host architecture; may be given multiple times (default: foreign)',
)
args = parser.parse_args()
if not hasattr(args, "architectures"):
args.architectures = ["foreign"]
architectures = []
for name in args.architectures:
if name == "foreign":
architectures.extend(
[
arch
for arch in ARCHITECTURES.values()
if arch is not HOST_ARCHITECTURE
]
)
elif name == "all":
architectures.extend(ARCHITECTURES.values())
else:
architectures.append(ARCHITECTURES[name])
for arch in architectures:
dir = args.directory / arch.name / "rootfs"
build_rootfs(arch, dir, btrfs=args.btrfs)
if args.build_drgn:
build_drgn_in_rootfs(dir)
|
