sys-boot/grub-efi-image: add initial work

sys-boot/grub-efi-image/Manifest

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+AUX grub-bootstrap.cfg 26 BLAKE2B 9acd7b63bca7b4ef14c9e676de6b827afecb7f1b4e92b23e36b6f1042f234bd9e5ca52b5a48363c66c2a935b77199b14b251356eceebd586b57894a7198aa9ab SHA512 ab7b22bfb260408aa695212a346d9e6a33f75584c23f2f3e611b74e4a211d9484bdf529894b79af7bb6bb2c30081edcda2802b03ac4dde646d3c9710c7903a22
+AUX grub-efi-modules 781 BLAKE2B ee58cdb8f4c3e605b9f8d497e8bba038df9fbeaa179da0940df87308902f3c48eb737667773c0a8a95ce46d3bf85e76dac8477aa7207506c6175d6021bd804a1 SHA512 3d82163af9bd84a6e4bd210122fd2608d40e1c09ed81639e45b15e45c140988de90116e48f15c9853515b21c1aae37a46b129631db86a2c90e93e9d9a63df180
+AUX grub-memdisk.cfg.in 212 BLAKE2B 01f7501be93c859d89453fd7e3ff58de3397cf9def38bc61270d9d574defcb5c63eede0599df65948a59e6ecb330f11ec9dbef7696019d07dcc5a5cd68cd23d4 SHA512 c8b44f37a6cfb1f6fd13f375e3a36fcf893fca9a2fe8e0ea79539bb681c53252c9cd12e7c13f5dcaaa616f84a9bbbc155cdb885b20d7356457bb796526f2ba74
+AUX sbat.csv.in 258 BLAKE2B dfd196fff3334844c3fb8b944e78a7c502572afa0e84c1a92be2b4b09730656dcc0dc518a291fafa8262f4209466a076c088dcd4e5d8dbcde629a00d97a833a7 SHA512 25541f85b23ed3f9fe53be9c9b293e45ec9ae7523d1f3b3b16a1b84f0fc0295e7d868c796a5119fa1693f0eed7face09cbab5eb0ce9d3ce6589ae1a198829eb7
+EBUILD grub-efi-image-0.ebuild 1836 BLAKE2B 487f9527ea0d1a8fec81ec520236ff9dbfb8e1be96c87a7c77bcabadd1b67531ebabe1b44b6ab24b042d96f3410e09d6e5bd99582183cb227ac056d3a8a42b28 SHA512 c34a944476f2c4783d002331ad78f4bd678d288be14e2e7d6b9326466357f4bc6b111e8242a0ad46f1e7ed33c73248c715a31a278ab62874d8dc648c72b78b64

sys-boot/grub-efi-image/files/grub-bootstrap.cfg

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+normal (memdisk)/grub.cfg

sys-boot/grub-efi-image/files/grub-efi-modules

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+all_video
+boot
+btrfs
+cat
+chain
+configfile
+echo
+efifwsetup
+efinet
+ext2
+fat
+font
+f2fs
+gettext
+gfxmenu
+gfxterm
+gfxterm_background
+gzio
+halt
+help
+hfsplus
+iso9660
+jfs
+jpeg
+keystatus
+loadenv
+loopback
+linux
+ls
+lsefi
+lsefimmap
+lsefisystab
+lssal
+memdisk
+minicmd
+normal
+ntfs
+part_apple
+part_msdos
+part_gpt
+password_pbkdf2
+png
+probe
+reboot
+regexp
+search
+search_fs_uuid
+search_fs_file
+search_label
+serial
+sleep
+smbios
+squash4
+tar
+test
+true
+video
+xfs
+zfs
+zfscrypt
+zfsinfo
+cpuid
+play
+tpm
+cryptodisk
+gcry_arcfour
+gcry_blowfish
+gcry_camellia
+gcry_cast5
+gcry_crc
+gcry_des
+gcry_dsa
+gcry_idea
+gcry_md4
+gcry_md5
+gcry_rfc2268
+gcry_rijndael
+gcry_rmd160
+gcry_rsa
+gcry_seed
+gcry_serpent
+gcry_sha1
+gcry_sha256
+gcry_sha512
+gcry_tiger
+gcry_twofish
+gcry_whirlpool
+luks
+lvm
+mdraid09
+mdraid1x
+raid5rec
+raid6rec

sys-boot/grub-efi-image/files/grub-memdisk.cfg.in

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+if loadfont (memdisk)/fonts/unicode.pf2 ; then
+  set gfxmode=auto
+  load_video
+  insmod gfxterm
+fi
+
+search --no-floppy --fs-uuid --set=root @BOOT_PART_UUID@
+set prefix=(\$root)/boot/grub
+source \$prefix/grub.cfg

sys-boot/grub-efi-image/files/sbat.csv.in

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+sbat,1,SBAT Version,sbat,1,https://github.com/rhboot/shim/blob/main/SBAT.md
+grub,1,Free Software Foundation,grub,2.06,https//www.gnu.org/software/grub/
+grub.gentoo,1,Gentoo Linux,grub,@GENTOO_GRUB_VERSION@,https://packages.gentoo.org/packages/sys-boot/grub/

sys-boot/grub-efi-image/grub-efi-image-0.ebuild

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+# Copyright 2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit mount-boot
+
+DESCRIPTION="Make GRUB EFI boot image"
+HOMEPAGE="https://www.gentoo.org/"
+SRC_URI=""
+
+LICENSE="GPL-3"
+SLOT="0"
+KEYWORDS="-* ~amd64 ~x86"
+
+IUSE="+grub_platforms_efi-64 grub_platforms_efi-32"
+
+DEPEND="
+	sys-boot/grub:2=[fonts]
+"
+RDEPEND="${DEPEND}"
+BDEPEND="
+	sys-apps/util-linux
+"
+
+GRUB_VERSION="2.06-r4"
+EFI_VENDOR="gentoo"
+GRUB_FONT_SIZE="24"
+
+S="${WORKDIR}"
+
+src_prepare() {
+	# grub-probe --target=fs_uuid doesn't work here
+	BOOT_DEV="$(grub-probe --target=device ${ROOT}/boot)"
+	BOOT_PART_UUID="$(lsblk -o UUID -n ${BOOT_DEV})"
+
+	[[ -z $BOOT_PART_UUID ]] && die "Can't find /boot partition UUID"
+	sed -e 's#@GENTOO_GRUB_VERSION@#'${GRUB_VERSION}'#g' \
+		"${FILESDIR}/sbat.csv.in" > sbat.csv || die
+
+	mkdir -p "${WORKDIR}/memdisk/fonts" || die
+	sed -e 's#@BOOT_PART_UUID@#'${BOOT_PART_UUID}'#g' \
+		"${FILESDIR}/grub-memdisk.cfg.in" > memdisk/grub.cfg || die
+
+	cp "${FILESDIR}/grub-bootstrap.cfg" "${WORKDIR}/"
+
+	eapply_user
+}
+
+src_compile() {
+	local plateform
+	local efi_name
+
+	grub-mkfont \
+		-s "${GRUB_FONT_SIZE}" \
+		-o "${WORKDIR}/memdisk/fonts/unicode.pf2" \
+		/usr/share/fonts/dejavu/DejaVuSansMono.ttf
+
+	tar -cf "${WORKDIR}/memdisk.tar" -C "${WORKDIR}/memdisk" .
+
+	if use grub_platforms_efi-64; then
+		platform="x86_64-efi"
+		efi_name="x64"
+	elif use grub_platforms_efi-64; then
+		platform="i386-efi"
+		efi_name="x32"
+	else
+		die "Unsupported platform"
+	fi
+
+	grub-mkimage \
+		-O "${platform}" \
+		-o "${WORKDIR}/grub${efi_name}.efi" \
+		-c "${WORKDIR}/grub-bootstrap.cfg" \
+		-d "/usr/lib/grub/${platform}" \
+		-m "${WORKDIR}/memdisk.tar" \
+		-p "/EFI/gentoo" \
+		--sbat "${WORKDIR}/sbat.csv" \
+		$(cat "${FILESDIR}/grub-efi-modules")
+}
+
+src_install() {
+	insinto /usr/lib/${PN}
+	doins grub*.efi
+}