# Copyright 1999-2018 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

EAPI="6"

inherit toolchain-funcs

# Find updates by searching and clicking the first link (hopefully it's the one):
# http://www.intel.com/content/www/us/en/search.html?keyword=Processor+Microcode+Data+File

NUM="27337"
DESCRIPTION="Intel IA32/IA64 microcode update data"
HOMEPAGE="http://inertiawar.com/microcode/ https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=${NUM}"
#SRC_URI="http://downloadmirror.intel.com/${NUM}/eng/microcode-${PV}.tgz"
SRC_URI="mirror://gentoo/microcode-${PV}.tgz
	https://dev.gentoo.org/~whissi/dist/${PN}/microcode-${PV}.tgz"

LICENSE="intel-ucode"
SLOT="0"
KEYWORDS="-* amd64 x86"
IUSE="initramfs scan-system +split-ucode"
REQUIRED_USE="|| ( initramfs split-ucode )"

DEPEND="initramfs? ( sys-apps/iucode_tool )
	scan-system? ( sys-apps/iucode_tool )"
RDEPEND="!<sys-apps/microcode-ctl-1.17-r2" #268586

S=${WORKDIR}

src_compile() {
	if use initramfs; then
		if use scan-system; then
			iucode_tool --scan-system --write-earlyfw=initramfs.cpio intel-ucode/ || die "Failed to generate initramfs cpio archive"
		else
			iucode_tool --write-earlyfw=initramfs.cpio intel-ucode/ || die "Failed to generate initramfs cpio archive"
		fi
	fi
}

src_install() {
	insinto /lib/firmware/intel-ucode
	if use initramfs; then
		doins initramfs.cpio
	fi
	if use split-ucode; then
		if use scan-system; then
			local re_signature="^iucode_tool: system has processor\(s\) with signature (0x[0-9a-f]+)$"
			local re_bundle="^microcode bundle ([0-9]+): (.*)$"
			local re_suitable="^([0-9]+)/([0-9]+): sig (0x[0-9a-f]+), pf_mask (0x[0-9a-f]+), ([0-9]{4}-[0-9]{2}-[0-9]{2}), rev (0x[0-9a-f]+), size ([0-9]+)$"
			local -A bundles=()
			local -a suitable=()
			local line index

			# Identify suitable bundles
			while read -r line; do
				if [[ $line =~ $re_signature ]]; then
					elog "Signature of detected processor(s): ${BASH_REMATCH[1]}"
				elif [[ $line =~ $re_bundle ]]; then
					bundles+=(["${BASH_REMATCH[1]}"]="${BASH_REMATCH[2]}")
				elif [[ $line =~ $re_suitable ]]; then
					index="${BASH_REMATCH[1]}"
					index="${index#"${index%%[!0]*}"}" # strip leading zero(s) from bundle index
					if [[ -n "${bundles[$index]+set}" ]]; then
						elog "Suitable microcode bundle: ${index} (${bundles[$index]})"
						suitable+=("$index")
					else
						ewarn "Ignoring invalid microcode bundle '${index}'"
					fi
				fi
			done < <(iucode_tool --scan-system --list intel-ucode/* 2>&1) # signature is written to stderr
			elog ""

			# Suitable bundles identified?
			if (( ${#suitable[@]} == 0 )); then
				ewarn "Unable to identify suitable microcode bundle(s)"
				ewarn "Please install without USE flag 'scan-system' instead"
				die "Failed to identify suitable microcode bundle(s)"
			fi

			# Install identified bundles
			insinto /lib/firmware/intel-ucode
			for index in ${suitable[@]}; do
				doins "${bundles[$index]}"
			done
		else
			doins intel-ucode/*
		fi
	fi
}

pkg_postinst() {
	if use initramfs; then
		elog "CPIO archive was installed to '/lib/firmware/intel-ucode/initramfs.cpio'"
		elog "This archive needs to be prepended to an existing initramfs image:"
		elog "# cat /lib/firmware/intel-ucode/initramfs.cpio existing-image > combined-image"
		elog ""
	fi
	if use split-ucode; then
		elog "Split binary ucode files were installed to '/lib/firmware/intel-ucode'"
		elog ""
	fi
	elog "Please refer to the Gentoo Wiki for more detailed information:"
	elog "https://wiki.gentoo.org/wiki/Intel_microcode"
}