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binfmt: refactor to support optionally working in Chroot

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InsanePrawn 2022-12-07 15:04:14 +01:00
parent 162691e4b5
commit e33f1a97d5
1 changed files with 41 additions and 14 deletions
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55
binfmt.py
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@ -4,15 +4,19 @@ import os
import logging
from typing import Optional
from chroot.abstract import Chroot
from constants import Arch, QEMU_ARCHES
from exec.cmd import run_root_cmd
from utils import mount
def binfmt_info():
def binfmt_info(chroot: Optional[Chroot] = None):
# Parse the info file
full = {}
info = "/usr/lib/binfmt.d/qemu-static.conf"
if chroot:
info = chroot.get_path(info)
logging.debug("parsing: " + info)
with open(info, "r") as handle:
for line in handle:
@ -48,13 +52,33 @@ def is_arch_known(arch: Arch, raise_exception: bool = False, action: Optional[st
return True
def binfmt_is_registered(arch: Arch) -> bool:
def binfmt_is_registered(arch: Arch, chroot: Optional[Chroot] = None) -> bool:
is_arch_known(arch, True, 'is_registered')
qemu_arch = QEMU_ARCHES[arch]
return os.path.exists("/proc/sys/fs/binfmt_misc/qemu-" + qemu_arch)
path = "/proc/sys/fs/binfmt_misc/qemu-" + qemu_arch
binfmt_ensure_mounted(chroot)
if chroot:
path = chroot.get_path(path)
return os.path.exists(path)
def register(arch: Arch):
def binfmt_ensure_mounted(chroot: Optional[Chroot] = None):
binfmt_path = '/proc/sys/fs/binfmt_misc'
register_path = binfmt_path + '/register'
if chroot:
binfmt_path = chroot.get_path(binfmt_path)
register_path = chroot.get_path(register_path)
chroot.activate()
if not os.path.exists(register_path):
logging.info('mounting binfmt_misc')
result = mount('binfmt_misc', binfmt_path, options=[], fs_type='binfmt_misc')
if result.returncode != 0:
raise Exception(f'Failed mounting binfmt_misc to {binfmt_path}')
def register(arch: Arch, chroot: Optional[Chroot] = None):
binfmt_path = '/proc/sys/fs/binfmt_misc'
register_path = binfmt_path + '/register'
is_arch_known(arch, True, 'register')
qemu_arch = QEMU_ARCHES[arch]
if binfmt_is_registered(arch):
@ -62,31 +86,34 @@ def register(arch: Arch):
lines = binfmt_info()
_runcmd = run_root_cmd
if chroot:
_runcmd = chroot.run_cmd
chroot.activate()
binfmt_ensure_mounted(chroot)
# Build registration string
# https://en.wikipedia.org/wiki/Binfmt_misc
# :name:type:offset:magic:mask:interpreter:flags
info = lines[qemu_arch]
code = info['line']
binfmt = '/proc/sys/fs/binfmt_misc'
register = binfmt + '/register'
if not os.path.exists(register):
logging.info('mounting binfmt_misc')
result = mount('binfmt_misc', binfmt, options=[], fs_type='binfmt_misc')
if result.returncode != 0:
raise Exception(f'Failed mounting binfmt_misc to {binfmt}')
# Register in binfmt_misc
logging.info(f"Registering qemu binfmt ({arch})")
run_root_cmd(f'echo "{code}" > {register} 2>/dev/null')
_runcmd(f'echo "{code}" > "{register_path}" 2>/dev/null') # use path without chroot path prefix
if not binfmt_is_registered(arch):
logging.debug(f'binfmt line: {code}')
raise Exception(f'Failed to register qemu-user for {arch} with binfmt_misc, {binfmt}/{info["name"]} not found')
raise Exception(f'Failed to register qemu-user for {arch} with binfmt_misc, {binfmt_path}/{info["name"]} not found')
def unregister(arch):
def unregister(arch, chroot: Optional[Chroot] = None):
is_arch_known(arch, True, 'unregister')
qemu_arch = QEMU_ARCHES[arch]
binfmt_ensure_mounted(chroot)
binfmt_file = "/proc/sys/fs/binfmt_misc/qemu-" + qemu_arch
if chroot:
binfmt_file = chroot.get_path(binfmt_file)
if not os.path.exists(binfmt_file):
return
logging.info(f"Unregistering qemu binfmt ({arch})")