sys-boot/shim: Move from cros_workon to upstream

Signed-off-by: Sayan Chowdhury <schowdhury@microsoft.com>

sdk_container/src/third_party/coreos-overlay/sys-boot/shim/Manifest

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+DIST shim-15.7.tar.gz 1334863 BLAKE2B 6b9370913daa1224e03a294728edf713e013dddf46104e9693cf92a7465ebdebb932bc37db190bd04b86d5c86d4c64bbfaee5f58e971a3605fd85ad778a3db42 SHA512 99a9792be8dd8834ce1f929af341db1fc8ff985b079cebb42a87a770b3672cde573893463c1444c28e30c78207d560c77ad17795dbf19f24795ab3e22d601cec

sdk_container/src/third_party/coreos-overlay/sys-boot/shim/shim-15.7.ebuild

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+# Copyright 2015 CoreOS, Inc.
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+inherit cros-workon multilib
+
+DESCRIPTION="UEFI Shim loader"
+HOMEPAGE="https://github.com/rhboot/shim"
+SRC_URI="https://github.com/rhboot/shim/releases/download/${PV}/shim-${PV}.tar.bz2 -> ${P}.tar.gz"
+KEYWORDS="amd64 arm64"
+
+LICENSE="BSD"
+SLOT="0"
+IUSE=""
+
+RDEPEND=""
+# TODO: Would be ideal to depend on sys-boot/gnu-efi package, but
+# currently the shim insists on using the bundled copy. This will need
+# to be addressed by patching this check out after making sure that
+# our copy of gnu-efi is as usable as the bundled one.
+DEPEND="
+	dev-libs/openssl
+  	coreos-base/coreos-sb-keys
+"
+src_compile() {
+	local emake_args=(
+		CROSS_COMPILE="${CHOST}-"
+	)
+	# Apparently our environment already has the ARCH variable in
+	# it, and Makefile picks it up instead of figuring it out
+	# itself with the compiler -dumpmachine flag. But also it
+	# expects a different format of the values. It wants x86_64
+	# instead of amd64, and aarch64 instead of arm64.
+	if use amd64; then
+		emake_args+=( ARCH=x86_64 )
+	elif use arm64; then
+		emake_args+=( ARCH=aarch64 )
+	fi
+  	emake_args+=( ENABLE_SBSIGN=1 )
+  	emake_args+=( VENDOR_CERT_FILE="/usr/share/sb_keys/shim.der" )
+	emake "${emake_args[@]}" || die
+}
+
+src_install() {
+	local suffix
+	suffix=''
+	if use amd64; then
+		suffix=x64
+	elif use arm64; then
+		suffix=aa64
+	fi
+	insinto /usr/lib/shim
+	newins "shim${suffix}.efi" 'shim.efi'
+  	newins "mm${suffix}.efi" "mm${suffix}.efi"
+}