# Copyright 2024-2025 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

LLVM_COMPAT=( {16..21} )

CRATES="
"

RUST_MIN_VER="1.82.0"

inherit llvm-r2 linux-info cargo rust-toolchain toolchain-funcs git-r3

DESCRIPTION="sched_ext schedulers and tools"
HOMEPAGE="https://github.com/sched-ext/scx"
# SRC_URI="
# 	https://github.com/sched-ext/scx/archive/refs/tags/v${PV}.tar.gz -> ${P}.tar.gz
# 	${CARGO_CRATE_URIS}
# "

# if [[ ${PKGBUMPING} != ${PVR} ]]; then
# 	SRC_URI+="
# 		https://github.com/gentoo-crate-dist/scx/releases/download/v${PV}/scx-${PV}-crates.tar.xz
# 	"
# fi

EGIT_REPO_URI="https://github.com/sched-ext/scx.git"

LICENSE="GPL-2"
# Dependent crate licenses
LICENSE+="
	Apache-2.0 BSD-2 BSD CC0-1.0 ISC MIT MPL-2.0 Unicode-3.0 ZLIB
"
SLOT="0"
KEYWORDS="~amd64"
IUSE="systemd +c-schedulers +rust-schedulers"
REQUIRED_USE="
	|| ( c-schedulers rust-schedulers )
"

DEPEND="
	virtual/libelf:=
	sys-libs/libseccomp
	sys-libs/zlib:=
	>=dev-libs/libbpf-1.6:=
"
RDEPEND="
	${DEPEND}
"
BDEPEND="
	app-misc/jq
	dev-libs/protobuf[protoc(+)]
	>=dev-util/bpftool-7.5.0
	$(llvm_gen_dep '
		llvm-core/clang:${LLVM_SLOT}=[llvm_targets_BPF(-)]
	')
"

CONFIG_CHECK="
	~BPF
	~BPF_EVENTS
	~BPF_JIT
	~BPF_SYSCALL
	~DEBUG_INFO_BTF
	~FTRACE
	~SCHED_CLASS_EXT
"

QA_PREBUILT="
	/usr/bin/scx_loader
	/usr/bin/vmlinux_docify
	/usr/bin/scxctl
"

# pkg_setup() {
	# linux-info_pkg_setup
	# llvm-r2_pkg_setup
	# rust_pkg_setup
	# einfo "${RUSTFLAGS}"
# }

src_unpack() {
	git-r3_src_unpack
	use rust-schedulers && cargo_live_src_unpack
}

src_prepare() {
	default

	# bug #944832
	sed -i 's;^#!/usr/bin/;#!/sbin/;' \
		services/openrc/scx.initrd || die
}

src_configure() {
	# local emesonargs=(
	# 	-Dbpf_clang="$(get_llvm_prefix)/bin/clang"
	# 	-Dbpftool=disabled
	# 	-Dlibbpf_a=disabled
	# 	-Dcargo="${EPREFIX}/usr/bin/cargo"
	# 	-Dcargo_home="${ECARGO_HOME}"
	# 	-Doffline=true
	# 	-Denable_rust=true
	# 	-Dopenrc=disabled
	# 	$(meson_feature systemd)
	# )

	use rust-schedulers && cargo_src_configure
}

src_compile() {
	use rust-schedulers && cargo_src_compile
	use c-schedulers && emake all
}

src_install() {
	use rust-schedulers && cargo_src_install
	use c-schedulers && emake install

	dodoc README.md

	local readme readme_name
	for readme in scheds/{rust,c}/*/README.md ./rust/*/README.md; do
		[[ -e ${readme} ]] || continue
		readme_name="${readme#*/rust/}"
		readme_name="${readme_name#*/c/}"
		readme_name="${readme_name%/README.md}"
		newdoc "${readme}" "${readme_name}.md"
	done

	newinitd services/openrc/scx.initrd scx
	insinto /etc/default
	doins services/scx
	dosym ../default/scx /etc/conf.d/scx
}