14094e9436
Building a foreign-arch image (e.g. arm64 Raspberry Pi OS on an x86 host) needs a qemu binfmt handler, or the chroot fails with "Exec format error". crossarch detects this before the target is erased and, on confirmation, installs qemu-user-static via the host package manager (apt-get/dnf/zypper/pacman) and registers binfmt; otherwise it aborts with per-distro instructions. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
72 lines
2.7 KiB
Python
72 lines
2.7 KiB
Python
"""Ensure the host can chroot into a foreign-architecture image (qemu binfmt)."""
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import platform
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import shutil
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from pathlib import Path
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from lim import runner, ui
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from lim.errors import LimError
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# Building natively needs no qemu; on these the chroot runs directly.
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_NATIVE_ARM = ("aarch64", "armv7l", "armv6l", "arm64")
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# Repo-based installs only; AUR helpers refuse to run from this root process.
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_BINFMT_INSTALLERS = {
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"apt-get": ["apt-get", "install", "-y", "qemu-user-static", "binfmt-support"],
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"dnf": ["dnf", "install", "-y", "qemu-user-static"],
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"zypper": ["zypper", "--non-interactive", "install", "qemu-linux-user"],
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"pacman": ["pacman", "-S", "--needed", "--noconfirm", "qemu-user-static-binfmt"],
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}
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def _entry_enabled(entry: Path) -> bool:
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try:
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return "enabled" in entry.read_text()
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except OSError:
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return False
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def qemu_binfmt_enabled() -> bool:
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binfmt = Path("/proc/sys/fs/binfmt_misc")
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return binfmt.is_dir() and any(_entry_enabled(e) for e in binfmt.glob("qemu-*"))
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def auto_enable() -> bool:
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"""Install qemu-user-static via the host package manager and register binfmt."""
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command = next((cmd for tool, cmd in _BINFMT_INSTALLERS.items() if shutil.which(tool)), None)
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if command is None:
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ui.warning("No supported host package manager found (apt-get/dnf/zypper/pacman).")
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return False
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runner.run(command, sudo=True, check=False)
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runner.run(["systemctl", "restart", "systemd-binfmt"], sudo=True, check=False)
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return qemu_binfmt_enabled()
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def ensure_ready() -> None:
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"""Make foreign-arch chroot work, or fail with actionable guidance.
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Called before the target is erased, so a host that cannot run the image's
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binaries aborts early instead of mid-build with a cryptic "Exec format error".
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"""
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if platform.machine() in _NATIVE_ARM:
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return
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if qemu_binfmt_enabled():
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ui.info("Cross-architecture build: qemu binfmt handlers are registered.")
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return
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ui.warning(
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f"Cross-architecture build: this host ({platform.machine()}) cannot run the "
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"image's ARM binaries in chroot yet."
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)
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if ui.confirm("Install qemu-user-static and register binfmt now?"):
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if auto_enable():
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ui.success("qemu binfmt handlers registered.")
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return
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ui.warning("Automatic setup did not register a handler.")
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raise LimError(
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"Cross-architecture chroot is not available. Install qemu-user-static + binfmt "
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"manually, or build on the target itself (e.g. the Pi booted from USB).\n"
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" Arch/Manjaro : qemu-user-static + qemu-user-static-binfmt (AUR), "
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"then: sudo systemctl restart systemd-binfmt\n"
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" Debian/Ubuntu: sudo apt install qemu-user-static binfmt-support"
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)
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