forked from Mirror/pmbootstrap
866e5bcfab
Move pmb/parse/arch.py over to core and refactor it as an Arch type, similar to how Chroot was done. Fix all the uses (that I can find) of arch in the codebase that need adjusting. The new Arch type is an Enum, making it clear what architectures can be represented and making it much easier to reason about. Since we support ~5 (kinda) different representations of an Architecture (Alpine, Kernel, target triple, platform, and QEMU), we now formalise that the Alpine format is what we represent internally, with methods to convert to any of the others as-needed. Signed-off-by: Caleb Connolly <caleb@postmarketos.org>
66 lines
2 KiB
Python
66 lines
2 KiB
Python
# Copyright 2023 Oliver Smith
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# SPDX-License-Identifier: GPL-3.0-or-later
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import os
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from pmb.core.arch import Arch
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from pmb.core.chroot import Chroot
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from pmb.helpers 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.chroot.apk
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def is_registered(arch_qemu: Arch):
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return os.path.exists(f"/proc/sys/fs/binfmt_misc/qemu-{arch_qemu}")
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def register(arch: Arch):
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"""
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Get arch, magic, mask.
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"""
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arch_qemu = arch.qemu()
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chroot = Chroot.native()
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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(chroot):
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pmb.chroot.apk.install(["qemu-" + arch_qemu], chroot)
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if is_registered(arch_qemu):
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return
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pmb.helpers.other.check_binfmt_misc()
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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(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(["sh", "-c", 'echo "' + code + '" > ' + register])
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def unregister(arch: Arch):
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arch_qemu = arch.qemu()
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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(["sh", "-c", "echo -1 > " + binfmt_file])
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