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pmbootstrap/pmb/chroot/binfmt.py

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Python

# Copyright 2023 Oliver Smith
# SPDX-License-Identifier: GPL-3.0-or-later
import os
from pmb.core.arch import Arch
from pmb.core.chroot import Chroot
from pmb.helpers import logging
import pmb.helpers.run
import pmb.helpers.other
import pmb.parse
import pmb.chroot.apk
def is_registered(arch_qemu: str | Arch) -> bool:
return os.path.exists(f"/proc/sys/fs/binfmt_misc/qemu-{arch_qemu}")
def register(arch: Arch) -> None:
"""
Get arch, magic, mask.
"""
arch_qemu = arch.qemu()
chroot = Chroot.native()
# always make sure the qemu-<arch> binary is installed, since registering
# may happen outside of this method (e.g. by OS)
if f"qemu-{arch_qemu}" not in pmb.chroot.apk.installed(chroot):
pmb.chroot.init(chroot)
pmb.chroot.apk.install(["qemu-" + arch_qemu], chroot)
if is_registered(arch_qemu):
return
pmb.helpers.other.check_binfmt_misc()
# Don't continue if the actions from check_binfmt_misc caused the OS to
# automatically register the target arch
if is_registered(arch_qemu):
return
info = pmb.parse.binfmt_info(arch_qemu)
# Build registration string
# https://en.wikipedia.org/wiki/Binfmt_misc
# :name:type:offset:magic:mask:interpreter:flags
name = "qemu-" + arch_qemu
type = "M"
offset = ""
magic = info["magic"]
mask = info["mask"]
interpreter = "/usr/bin/qemu-" + arch_qemu + "-static"
flags = "C"
code = ":".join(["", name, type, offset, magic, mask, interpreter, flags])
# Register in binfmt_misc
logging.info("Register qemu binfmt (" + arch_qemu + ")")
register = "/proc/sys/fs/binfmt_misc/register"
pmb.helpers.run.root(["sh", "-c", 'echo "' + code + '" > ' + register])
def unregister(arch: Arch) -> None:
arch_qemu = arch.qemu()
binfmt_file = "/proc/sys/fs/binfmt_misc/qemu-" + arch_qemu
if not os.path.exists(binfmt_file):
return
logging.info("Unregister qemu binfmt (" + arch_qemu + ")")
pmb.helpers.run.root(["sh", "-c", "echo -1 > " + binfmt_file])