forked from Mirror/pmbootstrap
db12e987d0
gitlab runners seem to be registering binfmt now (?), so this fixes an issue where register() might return immediately because the OS (or ??) took care of registration, but the qemu-<arch> binary wasn't added to the chroot.
64 lines
1.9 KiB
Python
64 lines
1.9 KiB
Python
# Copyright 2021 Oliver Smith
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# SPDX-License-Identifier: GPL-3.0-or-later
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import os
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import logging
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import pmb.helpers.run
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import pmb.helpers.other
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import pmb.parse
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import pmb.parse.arch
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def is_registered(arch_qemu):
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return os.path.exists("/proc/sys/fs/binfmt_misc/qemu-" + arch_qemu)
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def register(args, arch):
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"""
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Get arch, magic, mask.
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"""
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arch_qemu = pmb.parse.arch.alpine_to_qemu(arch)
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# always make sure the qemu-<arch> binary is installed, since registering
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# may happen outside of this method (e.g. by OS)
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if f"qemu-{arch_qemu}" not in pmb.chroot.apk.installed(args):
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pmb.chroot.apk.install(args, ["qemu-" + arch_qemu])
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if is_registered(arch_qemu):
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return
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pmb.helpers.other.check_binfmt_misc(args)
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# Don't continue if the actions from check_binfmt_misc caused the OS to
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# automatically register the target arch
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if is_registered(arch_qemu):
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return
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info = pmb.parse.binfmt_info(args, arch_qemu)
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# Build registration string
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# https://en.wikipedia.org/wiki/Binfmt_misc
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# :name:type:offset:magic:mask:interpreter:flags
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name = "qemu-" + arch_qemu
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type = "M"
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offset = ""
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magic = info["magic"]
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mask = info["mask"]
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interpreter = "/usr/bin/qemu-" + arch_qemu + "-static"
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flags = "C"
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code = ":".join(["", name, type, offset, magic, mask, interpreter,
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flags])
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# Register in binfmt_misc
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logging.info("Register qemu binfmt (" + arch_qemu + ")")
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register = "/proc/sys/fs/binfmt_misc/register"
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pmb.helpers.run.root(
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args, ["sh", "-c", 'echo "' + code + '" > ' + register])
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def unregister(args, arch):
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arch_qemu = pmb.parse.arch.alpine_to_qemu(arch)
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binfmt_file = "/proc/sys/fs/binfmt_misc/qemu-" + arch_qemu
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if not os.path.exists(binfmt_file):
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return
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logging.info("Unregister qemu binfmt (" + arch_qemu + ")")
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pmb.helpers.run.root(args, ["sh", "-c", "echo -1 > " + binfmt_file])
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