version = "7.0.9"
revision = 2
description = "Linux kernel"
license = "GPL-2.0-only"
source = tarball(
    url=f"https://cdn.kernel.org/pub/linux/kernel/v7.x/linux-{version}.tar.xz",
    sha256="ac07acdf76cf4621cc5187a2670270a1a699533c8a6b225e4878c416ad83f1c4",
)
host_deps = ["binutils", "gcc"]
deps = [profile["libc"]]

linux_archs = {"aarch64": "arm64"}
linux_subarchs = {"x86_64": "x86"}


def _make(self, *extra):
    arch = linux_archs.get(self.arch, self.arch)
    subarch = linux_subarchs.get(self.arch)
    subarch_arg = (f"SUBARCH={subarch}",) if subarch else ()
    return (
        "make",
        f"ARCH={arch}",
        *subarch_arg,
        f"CROSS_COMPILE={self.triple}-",
        f"-j{self.jobs}",
        *extra,
    )


def configure(self):
    self.run("cp", "-rp", f"{self.source_dir}/.", self.build_dir)
    self.run(
        "cp", self.files / f"config.{self.arch}", self.build_dir / ".config"
    )
    self.run(*_make(self, "olddefconfig"))


def build(self):
    self.run(*_make(self))


def install(self):
    self.run(
        "install",
        "-Dm644",
        self.build_dir / "arch/x86/boot/bzImage",
        self.dest_dir / f"boot/vmlinuz-{self.version}",
    )
    self.run(
        "install",
        "-Dm644",
        self.build_dir / ".config",
        self.dest_dir / f"boot/config-{self.version}",
    )
    self.run(
        "install",
        "-Dm644",
        self.build_dir / "System.map",
        self.dest_dir / f"boot/System.map-{self.version}",
    )
    # Install loadable modules so udev can autoload DRM/input drivers at boot.
    # The kernel's modules_install target runs depmod itself (host kmod).
    self.run(
        *_make(
            self,
            f"INSTALL_MOD_PATH={self.dest_dir}",
            "INSTALL_MOD_STRIP=1",
            "modules_install",
        )
    )
    # Drop the dangling build/source symlinks that point at the (ephemeral)
    # build tree; they are useless in the target image.
    self.run(
        "sh",
        "-c",
        f"rm -f {self.dest_dir}/lib/modules/*/build "
        f"{self.dest_dir}/lib/modules/*/source",
    )