diff --git a/sdk_container/src/third_party/coreos-overlay/profiles/coreos/targets/sdk/package.accept_keywords b/sdk_container/src/third_party/coreos-overlay/profiles/coreos/targets/sdk/package.accept_keywords
new file mode 100644
index 0000000000..7b5df04972
--- /dev/null
+++ b/sdk_container/src/third_party/coreos-overlay/profiles/coreos/targets/sdk/package.accept_keywords
@@ -0,0 +1,2 @@
+# Temporarily put the SDK version ahead for sd-json support in Dracut.
+=sys-apps/systemd-257.5 ~amd64 ~arm64
diff --git a/sdk_container/src/third_party/coreos-overlay/sys-apps/systemd/Manifest b/sdk_container/src/third_party/coreos-overlay/sys-apps/systemd/Manifest
index 08c9ddc293..aef14a442a 100644
--- a/sdk_container/src/third_party/coreos-overlay/sys-apps/systemd/Manifest
+++ b/sdk_container/src/third_party/coreos-overlay/sys-apps/systemd/Manifest
@@ -1 +1,2 @@
 DIST systemd-256.9.tar.gz 15774953 BLAKE2B caeff33d0906583094a44ab89fe9a9c1832a665f8cc768f86c55c5100bdd5c2b1500b2cd65e9519ef21d79bff92d1da3e84240793099a0e0c508afba3669c46e SHA512 aba7a0f7149fe3d28d9f930f244d5b997c28721e93e6f0768b0f0f1c918c87a0e8b7b347cffb2faa4740ca3ee3b04984454e85757365090a2cf32aba09f70681
+DIST systemd-257.5.tar.gz 16232112 BLAKE2B 142baef9b09217ea117ac09923604f7520a36d4c63cf04a78d1c4fbf7b057b977f5c77418168c0308a8dc6b48ccc6324438f30c87de8642e8e9cf12b47f90475 SHA512 9e5352c20c9edac53f302a534532035185139998628ed0a85411f440df47f1dd7cce6651aec787484809bb1aa2825008d062714c37936cbfd08451fbe29a998f
diff --git a/sdk_container/src/third_party/coreos-overlay/sys-apps/systemd/files/0006-Revert-getty-Pass-tty-to-use-by-agetty-via-stdin-257.patch b/sdk_container/src/third_party/coreos-overlay/sys-apps/systemd/files/0006-Revert-getty-Pass-tty-to-use-by-agetty-via-stdin-257.patch
new file mode 100644
index 0000000000..6f81ae8b68
--- /dev/null
+++ b/sdk_container/src/third_party/coreos-overlay/sys-apps/systemd/files/0006-Revert-getty-Pass-tty-to-use-by-agetty-via-stdin-257.patch
@@ -0,0 +1,92 @@
+From bffb2a48796a2736d7fb7328d2a88b1cbb812b12 Mon Sep 17 00:00:00 2001
+From: Sayan Chowdhury <schowdhury@microsoft.com>
+Date: Fri, 16 Dec 2022 16:28:26 +0530
+Subject: [PATCH 6/8] Revert "getty: Pass tty to use by agetty via stdin"
+
+This reverts commit b4bf9007cbee7dc0b1356897344ae2a7890df84c.
+
+This is to work around a SELinux denial that happens when setting up standard
+input for serial consoles (which is used for SSH connections).
+
+Signed-off-by: Sayan Chowdhury <schowdhury@microsoft.com>
+---
+ units/console-getty.service.in    | 4 +---
+ units/container-getty@.service.in | 4 +---
+ units/getty@.service.in           | 4 +---
+ units/serial-getty@.service.in    | 4 +---
+ 4 files changed, 4 insertions(+), 12 deletions(-)
+
+diff --git a/units/console-getty.service.in b/units/console-getty.service.in
+index 33e6368db1..1f2d8b910f 100644
+--- a/units/console-getty.service.in
++++ b/units/console-getty.service.in
+@@ -22,12 +22,10 @@ ConditionPathExists=/dev/console
+ [Service]
+ # The '-o' option value tells agetty to replace 'login' arguments with '--' for
+ # safety, and then the entered username.
+-ExecStart=-/sbin/agetty -o '-- \\u' --noreset --noclear --keep-baud 115200,57600,38400,9600 - ${TERM}
++ExecStart=-/sbin/agetty -o '-- \\u' --noreset --noclear --keep-baud 115200,57600,38400,9600 console ${TERM}
+ Type=idle
+ Restart=always
+ UtmpIdentifier=cons
+-StandardInput=tty
+-StandardOutput=tty
+ TTYPath=/dev/console
+ TTYReset=yes
+ TTYVHangup=yes
+diff --git a/units/container-getty@.service.in b/units/container-getty@.service.in
+index 7573532d6d..5f27653d1f 100644
+--- a/units/container-getty@.service.in
++++ b/units/container-getty@.service.in
+@@ -27,13 +27,11 @@ Before=rescue.service
+ [Service]
+ # The '-o' option value tells agetty to replace 'login' arguments with '--' for
+ # safety, and then the entered username.
+-ExecStart=-/sbin/agetty -o '-- \\u' --noreset --noclear - ${TERM}
++ExecStart=-/sbin/agetty -o '-- \\u' --noreset --noclear pts/%I ${TERM}
+ Type=idle
+ Restart=always
+ RestartSec=0
+ UtmpIdentifier=pts/%I
+-StandardInput=tty
+-StandardOutput=tty
+ TTYPath=/dev/pts/%I
+ TTYReset=yes
+ TTYVHangup=yes
+diff --git a/units/getty@.service.in b/units/getty@.service.in
+index f30bba406d..1819627d1c 100644
+--- a/units/getty@.service.in
++++ b/units/getty@.service.in
+@@ -36,13 +36,11 @@ ConditionPathExists=/dev/tty0
+ [Service]
+ # The '-o' option value tells agetty to replace 'login' arguments with '--' for
+ # safety, and then the entered username.
+-ExecStart=-/sbin/agetty -o '-- \\u' --noreset --noclear - ${TERM}
++ExecStart=-/sbin/agetty -o '-- \\u' --noreset --noclear %I ${TERM}
+ Type=idle
+ Restart=always
+ RestartSec=0
+ UtmpIdentifier=%I
+-StandardInput=tty
+-StandardOutput=tty
+ TTYPath=/dev/%I
+ TTYReset=yes
+ TTYVHangup=yes
+diff --git a/units/serial-getty@.service.in b/units/serial-getty@.service.in
+index 20a5eb2754..ba4cbc0edb 100644
+--- a/units/serial-getty@.service.in
++++ b/units/serial-getty@.service.in
+@@ -32,12 +32,10 @@ Before=rescue.service
+ [Service]
+ # The '-o' option value tells agetty to replace 'login' arguments with '--' for
+ # safety, and then the entered username.
+-ExecStart=-/sbin/agetty -o '-- \\u' --noreset --noclear --keep-baud 115200,57600,38400,9600 - ${TERM}
++ExecStart=-/sbin/agetty -o '-- \\u' --noreset --noclear --keep-baud 115200,57600,38400,9600 %I ${TERM}
+ Type=idle
+ Restart=always
+ UtmpIdentifier=%I
+-StandardInput=tty
+-StandardOutput=tty
+ TTYPath=/dev/%I
+ TTYReset=yes
+ TTYVHangup=yes
diff --git a/sdk_container/src/third_party/coreos-overlay/sys-apps/systemd/systemd-257.5.ebuild b/sdk_container/src/third_party/coreos-overlay/sys-apps/systemd/systemd-257.5.ebuild
new file mode 100644
index 0000000000..e4075f6c2a
--- /dev/null
+++ b/sdk_container/src/third_party/coreos-overlay/sys-apps/systemd/systemd-257.5.ebuild
@@ -0,0 +1,769 @@
+# Copyright 2011-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+PYTHON_COMPAT=( python3_{10..13} )
+
+# Avoid QA warnings
+TMPFILES_OPTIONAL=1
+UDEV_OPTIONAL=1
+
+QA_PKGCONFIG_VERSION=$(ver_cut 1)
+
+if [[ ${PV} == 9999 ]]; then
+	EGIT_REPO_URI="https://github.com/systemd/systemd.git"
+	inherit git-r3
+else
+	MY_PV=${PV/_/-}
+	MY_P=${PN}-${MY_PV}
+	S=${WORKDIR}/${MY_P}
+	SRC_URI="https://github.com/systemd/${PN}/archive/refs/tags/v${MY_PV}.tar.gz -> ${MY_P}.tar.gz"
+
+	if [[ ${PV} != *rc* ]] ; then
+		# Flatcar: mark as stable
+		KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
+	fi
+fi
+
+inherit bash-completion-r1 linux-info meson-multilib optfeature pam python-single-r1
+inherit secureboot systemd tmpfiles toolchain-funcs udev
+
+DESCRIPTION="System and service manager for Linux"
+HOMEPAGE="https://systemd.io/"
+
+LICENSE="GPL-2 LGPL-2.1 MIT public-domain"
+SLOT="0/2"
+IUSE="
+	acl apparmor audit boot bpf cgroup-hybrid cryptsetup curl +dns-over-tls elfutils
+	fido2 +gcrypt gnutls homed http idn importd iptables +kernel-install +kmod
+	+lz4 lzma +openssl pam pcre pkcs11 policykit pwquality qrcode
+	+resolvconf +seccomp selinux split-usr +sysv-utils test tpm ukify vanilla xkb +zstd
+"
+REQUIRED_USE="
+	${PYTHON_REQUIRED_USE}
+	dns-over-tls? ( || ( gnutls openssl ) )
+	fido2? ( cryptsetup openssl )
+	homed? ( cryptsetup pam openssl )
+	importd? ( curl lzma || ( gcrypt openssl ) )
+	pwquality? ( homed )
+	boot? ( kernel-install )
+	ukify? ( boot )
+"
+RESTRICT="!test? ( test )"
+
+MINKV="4.15"
+
+COMMON_DEPEND="
+	>=sys-apps/util-linux-2.32:0=[${MULTILIB_USEDEP}]
+	sys-libs/libcap:0=[${MULTILIB_USEDEP}]
+	virtual/libcrypt:=[${MULTILIB_USEDEP}]
+	acl? ( sys-apps/acl:0= )
+	apparmor? ( >=sys-libs/libapparmor-2.13:0= )
+	audit? ( >=sys-process/audit-2:0= )
+	bpf? ( >=dev-libs/libbpf-1.4.0:0= )
+	cryptsetup? ( >=sys-fs/cryptsetup-2.0.1:0= )
+	curl? ( >=net-misc/curl-7.32.0:0= )
+	elfutils? ( >=dev-libs/elfutils-0.158:0= )
+	fido2? ( dev-libs/libfido2:0= )
+	gcrypt? ( >=dev-libs/libgcrypt-1.4.5:0=[${MULTILIB_USEDEP}] )
+	gnutls? ( >=net-libs/gnutls-3.6.0:0= )
+	http? ( >=net-libs/libmicrohttpd-0.9.33:0=[epoll(+)] )
+	idn? ( net-dns/libidn2:= )
+	importd? (
+		app-arch/bzip2:0=
+		sys-libs/zlib:0=
+	)
+	kmod? ( >=sys-apps/kmod-15:0= )
+	lz4? ( >=app-arch/lz4-0_p131:0=[${MULTILIB_USEDEP}] )
+	lzma? ( >=app-arch/xz-utils-5.0.5-r1:0=[${MULTILIB_USEDEP}] )
+	iptables? ( net-firewall/iptables:0= )
+	openssl? ( >=dev-libs/openssl-1.1.0:0= )
+	pam? ( sys-libs/pam:=[${MULTILIB_USEDEP}] )
+	pkcs11? ( >=app-crypt/p11-kit-0.23.3:0= )
+	pcre? ( dev-libs/libpcre2 )
+	pwquality? ( >=dev-libs/libpwquality-1.4.1:0= )
+	qrcode? ( >=media-gfx/qrencode-3:0= )
+	seccomp? ( >=sys-libs/libseccomp-2.3.3:0= )
+	selinux? ( >=sys-libs/libselinux-2.1.9:0= )
+	tpm? ( app-crypt/tpm2-tss:0= )
+	xkb? ( >=x11-libs/libxkbcommon-0.4.1:0= )
+	zstd? ( >=app-arch/zstd-1.4.0:0=[${MULTILIB_USEDEP}] )
+"
+
+# Newer linux-headers needed by ia64, bug #480218
+DEPEND="${COMMON_DEPEND}
+	>=sys-kernel/linux-headers-${MINKV}
+"
+
+PEFILE_DEPEND='dev-python/pefile[${PYTHON_USEDEP}]'
+
+# baselayout-2.2 has /run
+#
+# Flatcar: Drop sec-policy/selinux-ntp from deps (under selinux use
+# flag). The image stage fails with "Failed to resolve
+# typeattributeset statement at
+# /var/lib/selinux/mcs/tmp/modules/400/ntp/cil:120"
+#
+# Flatcar: Added a dep on sys-apps/kbd. It provides a loadkeys binary
+# needed by dracut's systemd-vconsole-setup module.
+RDEPEND="${COMMON_DEPEND}
+	>=acct-group/adm-0-r1
+	>=acct-group/wheel-0-r1
+	>=acct-group/kmem-0-r1
+	>=acct-group/tty-0-r1
+	>=acct-group/utmp-0-r1
+	>=acct-group/audio-0-r1
+	>=acct-group/cdrom-0-r1
+	>=acct-group/dialout-0-r1
+	>=acct-group/disk-0-r1
+	>=acct-group/input-0-r1
+	>=acct-group/kvm-0-r1
+	>=acct-group/lp-0-r1
+	>=acct-group/render-0-r1
+	acct-group/sgx
+	>=acct-group/tape-0-r1
+	acct-group/users
+	>=acct-group/video-0-r1
+	>=acct-group/systemd-journal-0-r1
+	>=acct-user/root-0-r1
+	acct-user/nobody
+	>=acct-user/systemd-journal-remote-0-r1
+	>=acct-user/systemd-coredump-0-r1
+	>=acct-user/systemd-network-0-r1
+	acct-user/systemd-oom
+	>=acct-user/systemd-resolve-0-r1
+	>=acct-user/systemd-timesync-0-r1
+	>=sys-apps/baselayout-2.2
+	sys-apps/kbd
+	ukify? (
+		${PYTHON_DEPS}
+		$(python_gen_cond_dep "${PEFILE_DEPEND}")
+	)
+	selinux? (
+		sec-policy/selinux-base-policy[systemd]
+	)
+	sysv-utils? (
+		!sys-apps/openrc[sysv-utils(-)]
+		!sys-apps/openrc-navi[sysv-utils(-)]
+		!sys-apps/sysvinit
+	)
+	!sysv-utils? ( sys-apps/sysvinit )
+	resolvconf? ( !net-dns/openresolv )
+	!sys-auth/nss-myhostname
+	!sys-fs/eudev
+	!sys-fs/udev
+"
+
+# sys-apps/dbus: the daemon only (+ build-time lib dep for tests)
+PDEPEND=">=sys-apps/dbus-1.9.8[systemd]
+	>=sys-fs/udev-init-scripts-34
+	policykit? ( sys-auth/polkit )
+	!vanilla? ( sys-apps/gentoo-systemd-integration )"
+
+BDEPEND="
+	app-arch/xz-utils:0
+	dev-util/gperf
+	>=dev-build/meson-0.46
+	>=sys-apps/coreutils-8.16
+	sys-devel/gettext
+	virtual/pkgconfig
+	bpf? (
+		dev-util/bpftool
+		sys-devel/bpf-toolchain
+	)
+	test? (
+		app-text/tree
+		dev-lang/perl
+		sys-apps/dbus
+	)
+	app-text/docbook-xml-dtd:4.2
+	app-text/docbook-xml-dtd:4.5
+	app-text/docbook-xsl-stylesheets
+	dev-libs/libxslt:0
+	${PYTHON_DEPS}
+	$(python_gen_cond_dep "
+		dev-python/jinja2[\${PYTHON_USEDEP}]
+		dev-python/lxml[\${PYTHON_USEDEP}]
+		boot? (
+			>=dev-python/pyelftools-0.30[\${PYTHON_USEDEP}]
+			test? ( ${PEFILE_DEPEND} )
+		)
+	")
+"
+
+QA_FLAGS_IGNORED="usr/lib/systemd/boot/efi/.*"
+QA_EXECSTACK="usr/lib/systemd/boot/efi/*"
+
+pkg_pretend() {
+	# Flatcar: We keep using split-usr for SDK.
+	# if use split-usr; then
+	# 	eerror "Please complete the migration to merged-usr."
+	# 	eerror "https://wiki.gentoo.org/wiki/Merge-usr"
+	# 	die "systemd no longer supports split-usr"
+	# fi
+	if [[ ${MERGE_TYPE} != buildonly ]]; then
+		local CONFIG_CHECK="~BLK_DEV_BSG ~CGROUPS
+			~CGROUP_BPF ~DEVTMPFS ~EPOLL ~FANOTIFY ~FHANDLE
+			~INOTIFY_USER ~IPV6 ~NET ~NET_NS ~PROC_FS ~SIGNALFD ~SYSFS
+			~TIMERFD ~TMPFS_XATTR ~UNIX ~USER_NS
+			~CRYPTO_HMAC ~CRYPTO_SHA256 ~CRYPTO_USER_API_HASH
+			~!GRKERNSEC_PROC ~!IDE ~!SYSFS_DEPRECATED
+			~!SYSFS_DEPRECATED_V2"
+
+		use acl && CONFIG_CHECK+=" ~TMPFS_POSIX_ACL"
+		use bpf && CONFIG_CHECK+=" ~BPF ~BPF_SYSCALL ~BPF_LSM ~DEBUG_INFO_BTF"
+		use seccomp && CONFIG_CHECK+=" ~SECCOMP ~SECCOMP_FILTER"
+
+		if kernel_is -ge 5 10 20; then
+			CONFIG_CHECK+=" ~KCMP"
+		else
+			CONFIG_CHECK+=" ~CHECKPOINT_RESTORE"
+		fi
+
+		if kernel_is -ge 4 18; then
+			CONFIG_CHECK+=" ~AUTOFS_FS"
+		else
+			CONFIG_CHECK+=" ~AUTOFS4_FS"
+		fi
+
+		if linux_config_exists; then
+			local uevent_helper_path=$(linux_chkconfig_string UEVENT_HELPER_PATH)
+			if [[ -n ${uevent_helper_path} ]] && [[ ${uevent_helper_path} != '""' ]]; then
+				ewarn "It's recommended to set an empty value to the following kernel config option:"
+				ewarn "CONFIG_UEVENT_HELPER_PATH=${uevent_helper_path}"
+			fi
+			if linux_chkconfig_present X86; then
+				CONFIG_CHECK+=" ~DMIID"
+			fi
+		fi
+
+		if kernel_is -lt ${MINKV//./ }; then
+			ewarn "Kernel version at least ${MINKV} required"
+		fi
+
+		check_extra_config
+	fi
+}
+
+pkg_setup() {
+	use boot && secureboot_pkg_setup
+}
+
+src_unpack() {
+	default
+	[[ ${PV} != 9999 ]] || git-r3_src_unpack
+}
+
+src_prepare() {
+	local PATCHES=(
+		# Flatcar: Adding our own patches here.
+		"${FILESDIR}/0001-wait-online-set-any-by-default.patch"
+		"${FILESDIR}/0003-needs-update-don-t-require-strictly-newer-usr.patch"
+		"${FILESDIR}/0004-core-use-max-for-DefaultTasksMax.patch"
+		"${FILESDIR}/0005-systemd-Disable-SELinux-permissions-checks.patch"
+		"${FILESDIR}/0006-Revert-getty-Pass-tty-to-use-by-agetty-via-stdin-257.patch"
+		"${FILESDIR}/0007-units-Keep-using-old-journal-file-format.patch"
+		"${FILESDIR}/0009-initrd-parse-etc.service.patch"
+	)
+
+	if ! use vanilla; then
+		PATCHES+=(
+			"${FILESDIR}/gentoo-journald-audit-r1.patch"
+		)
+	fi
+
+	# Fails with split-usr.
+	sed -i -e '2i exit 77' test/test-rpm-macros.sh || die
+
+	# Flatcar: The Kubelet takes /etc/resolv.conf for, e.g.,
+	# CoreDNS which has dnsPolicy "default", but unless the
+	# kubelet --resolv-conf flag is set to point to
+	# /run/systemd/resolve/resolv.conf this won't work with
+	# /etc/resolv.conf pointing to
+	# /run/systemd/resolve/stub-resolv.conf which configures
+	# 127.0.0.53.  See
+	# https://kubernetes.io/docs/tasks/administer-cluster/dns-debugging-resolution/#known-issues
+	# This means that users who need split DNS to work should
+	# point /etc/resolv.conf back to
+	# /run/systemd/resolve/stub-resolv.conf (and if using K8s
+	# configure the kubelet resolvConf variable/--resolv-conf flag
+	# to /run/systemd/resolve/resolv.conf).
+	sed -i -e 's,/run/systemd/resolve/stub-resolv.conf,/run/systemd/resolve/resolv.conf,' tmpfiles.d/systemd-resolve.conf || die
+	default
+}
+
+src_configure() {
+	# Prevent conflicts with i686 cross toolchain, bug 559726
+	tc-export AR CC NM OBJCOPY RANLIB
+
+	python_setup
+
+	multilib-minimal_src_configure
+}
+
+# Flatcar: Our function, we use it in some places below.
+get_rootprefix() {
+	usex split-usr "${EPREFIX:-/}" "${EPREFIX}/usr"
+}
+
+multilib_src_configure() {
+	local myconf=(
+		--localstatedir="${EPREFIX}/var"
+		# default is developer, bug 918671
+		-Dmode=release
+		# Flatcar: Point to our user mailing list.
+		-Dsupport-url="https://groups.google.com/forum/#!forum/flatcar-linux-user"
+		-Dpamlibdir="$(getpam_mod_dir)"
+		# avoid bash-completion dep
+		-Dbashcompletiondir="$(get_bashcompdir)"
+		# Flatcar: We keep using split-usr in SDK.
+		$(meson_use split-usr)
+		# Flatcar: Always set split-bin to true, we always
+		# have separate bin and sbin directories
+		-Dsplit-bin=true
+		# Flatcar: Use get_rootprefix. No functional change
+		# from upstream, just refactoring the common code used
+		# in some places.
+		#
+		# TODO: Drop -Drootprefix and -Drootlibdir we get rid
+		# of split-usr in SDK
+		-Drootprefix="$(get_rootprefix)"
+		-Drootlibdir="${EPREFIX}/usr/$(get_libdir)"
+		# Disable compatibility with sysvinit
+		-Dsysvinit-path=
+		-Dsysvrcnd-path=
+		# no deps
+		-Dima=true
+		# Match /etc/shells, bug 919749
+		-Ddebug-shell="${EPREFIX}/bin/sh"
+		-Ddefault-user-shell="${EPREFIX}/bin/bash"
+		# Optional components/dependencies
+		$(meson_native_use_feature acl)
+		$(meson_native_use_feature apparmor)
+		$(meson_native_use_feature audit)
+		$(meson_native_use_feature boot bootloader)
+		$(meson_native_use_feature bpf bpf-framework)
+		-Dbpf-compiler=gcc
+		$(meson_native_use_feature cryptsetup libcryptsetup)
+		$(meson_native_use_feature curl libcurl)
+		$(meson_native_use_bool dns-over-tls dns-over-tls)
+		$(meson_native_use_feature elfutils)
+		$(meson_native_use_feature fido2 libfido2)
+		$(meson_feature gcrypt)
+		$(meson_native_use_feature gnutls)
+		$(meson_native_use_feature homed)
+		$(meson_native_use_feature http microhttpd)
+		$(meson_native_use_bool idn)
+		$(meson_native_use_feature importd)
+		$(meson_native_use_feature importd bzip2)
+		$(meson_native_use_feature importd zlib)
+		$(meson_native_use_bool kernel-install)
+		$(meson_native_use_feature kmod)
+		$(meson_feature lz4)
+		$(meson_feature lzma xz)
+		$(meson_use test tests)
+		$(meson_feature zstd)
+		$(meson_native_use_feature iptables libiptc)
+		$(meson_native_use_feature openssl)
+		$(meson_feature pam)
+		$(meson_native_use_feature pkcs11 p11kit)
+		$(meson_native_use_feature pcre pcre2)
+		$(meson_native_use_feature policykit polkit)
+		$(meson_native_use_feature pwquality)
+		$(meson_native_use_feature qrcode qrencode)
+		$(meson_native_use_feature seccomp)
+		$(meson_native_use_feature selinux)
+		$(meson_native_use_feature tpm tpm2)
+		$(meson_native_use_feature test dbus)
+		$(meson_native_use_feature ukify)
+		$(meson_native_use_feature xkb xkbcommon)
+		# Flatcar: Use our ntp servers.
+		-Dntp-servers="0.flatcar.pool.ntp.org 1.flatcar.pool.ntp.org 2.flatcar.pool.ntp.org 3.flatcar.pool.ntp.org"
+		# Breaks screen, tmux, etc.
+		-Ddefault-kill-user-processes=false
+		# Flatcar: TODO: Investigate if we want this.
+		-Dcreate-log-dirs=false
+
+		# multilib options
+		$(meson_native_true backlight)
+		$(meson_native_true binfmt)
+		$(meson_native_true coredump)
+		$(meson_native_true environment-d)
+		$(meson_native_true firstboot)
+		$(meson_native_true hibernate)
+		$(meson_native_true hostnamed)
+		$(meson_native_true ldconfig)
+		$(meson_native_true localed)
+		$(meson_native_enabled man)
+		$(meson_native_true networkd)
+		$(meson_native_true quotacheck)
+		$(meson_native_true randomseed)
+		$(meson_native_true rfkill)
+		$(meson_native_true sysusers)
+		$(meson_native_true timedated)
+		$(meson_native_true timesyncd)
+		$(meson_native_true tmpfiles)
+		$(meson_native_true vconsole)
+		$(meson_native_enabled vmspawn)
+		# Flatcar: Specify this, or meson breaks due to no
+		# /etc/login.defs.
+		-Dsystem-gid-max=999
+		-Dsystem-uid-max=999
+
+		# Flatcar: DBus paths.
+		-Ddbussessionservicedir="${EPREFIX}/usr/share/dbus-1/services"
+		-Ddbussystemservicedir="${EPREFIX}/usr/share/dbus-1/system-services"
+
+		# Flatcar: PAM config directory.
+		-Dpamconfdir=/usr/share/pam.d
+
+		# Flatcar: The CoreOS epoch, Mon Jul 1 00:00:00 UTC
+		# 2013. Used by timesyncd as a sanity check for the
+		# minimum acceptable time. Explicitly set to avoid
+		# using the current build time.
+		-Dtime-epoch=1372636800
+
+		# Flatcar: No default name servers.
+		-Ddns-servers=
+
+		# Flatcar: Disable the "First Boot Wizard", it isn't
+		# very applicable to us.
+		-Dfirstboot=false
+
+		# Flatcar: Set latest network interface naming scheme
+		# for https://github.com/flatcar/Flatcar/issues/36
+		-Ddefault-net-naming-scheme=latest
+
+		# Flatcar: Combined log format: name plus description
+		-Dstatus-unit-format-default=combined
+
+		# Flatcar: Unported options, still needed?
+		-Dquotaon-path=/usr/sbin/quotaon
+		-Dquotacheck-path=/usr/sbin/quotacheck
+		-Ddefault-mdns=no
+	)
+
+	case $(tc-arch) in
+		amd64|arm|arm64|loong|ppc|ppc64|riscv|s390|x86)
+			# src/vmspawn/vmspawn-util.h: QEMU_MACHINE_TYPE
+			myconf+=( $(meson_native_enabled vmspawn) ) ;;
+		*)
+			myconf+=( -Dvmspawn=disabled ) ;;
+	esac
+
+	meson_src_configure "${myconf[@]}"
+}
+
+multilib_src_test() {
+	(
+		unset DBUS_SESSION_BUS_ADDRESS XDG_RUNTIME_DIR
+		export COLUMNS=80
+		addpredict /dev
+		addpredict /proc
+		addpredict /run
+		addpredict /sys/fs/cgroup
+		meson_src_test --timeout-multiplier=10
+	) || die
+}
+
+multilib_src_install_all() {
+	# meson doesn't know about docdir
+	mv "${ED}"/usr/share/doc/{systemd,${PF}} || die
+
+	einstalldocs
+	# Flatcar: Do not install sample nsswitch.conf, we don't
+	# provide it.
+	# dodoc "${FILESDIR}"/nsswitch.conf
+
+	insinto /usr/lib/tmpfiles.d
+	doins "${FILESDIR}"/legacy.conf
+
+	if ! use resolvconf; then
+		rm -f "${ED}"/usr/bin/resolvconf || die
+	fi
+
+	if ! use sysv-utils; then
+		rm "${ED}"/usr/bin/{halt,init,poweroff,reboot,shutdown} || die
+		rm "${ED}"/usr/share/man/man1/init.1 || die
+		rm "${ED}"/usr/share/man/man8/{halt,poweroff,reboot,shutdown}.8 || die
+	fi
+
+	# https://bugs.gentoo.org/761763
+	rm -r "${ED}"/usr/lib/sysusers.d || die
+
+	# Flatcar: Upstream uses keepdir commands to keep some empty
+	# directories. We use tmpfiles.
+	# Preserve empty dirs in /etc & /var, bug #437008
+	keepdir /etc/{binfmt.d,modules-load.d,tmpfiles.d}
+	keepdir /etc/kernel/install.d
+	keepdir /etc/systemd/{network,system,user}
+	keepdir /etc/udev/rules.d
+
+	keepdir /etc/udev/hwdb.d
+
+	# keepdir /usr/lib/systemd/{system-sleep,system-shutdown}
+	# keepdir /usr/lib/{binfmt.d,modules-load.d}
+	# keepdir /usr/lib/systemd/user-generators
+	# keepdir /var/lib/systemd
+	# keepdir /var/log/journal
+
+	# if use pam; then
+	# 	if use selinux; then
+	# 		newpamd "${FILESDIR}"/systemd-user-selinux.pam systemd-user
+	#	else
+	#		newpamd "${FILESDIR}"/systemd-user.pam systemd-user
+	#	fi
+	# fi
+
+	if use kernel-install; then
+		# Dummy config, remove to make room for sys-kernel/installkernel
+		rm "${ED}/usr/lib/kernel/install.conf" || die
+	fi
+	# Flatcar: Ensure journal directory has correct ownership/mode
+	# in inital image.  This is fixed by systemd-tmpfiles *but*
+	# journald starts before that and will create the journal if
+	# the filesystem is already read-write.  Conveniently the
+	# systemd Makefile sets this up completely wrong.
+	#
+	# Flatcar: TODO: Is this still a problem?
+	dodir /var/log/journal
+	fowners root:systemd-journal /var/log/journal
+	fperms 2755 /var/log/journal
+
+	# Flatcar: Don't prune systemd dirs.
+	dotmpfiles "${FILESDIR}"/systemd-flatcar.conf
+	# Flatcar: Add tmpfiles rule for resolv.conf. This path has
+	# changed after v213 so it must be handled here instead of
+	# baselayout now.
+	dotmpfiles "${FILESDIR}"/systemd-resolv.conf
+
+	# Flatcar: Don't default to graphical.target.
+	local unitdir=$(builddir_systemd_get_systemunitdir)
+	dosym multi-user.target "${unitdir}"/default.target
+
+	# Flatcar: Don't set any extra environment variables by default.
+	rm "${ED}/usr/lib/environment.d/99-environment.conf" || die
+
+	# Flatcar: These lines more or less follow the systemd's
+	# preset file (90-systemd.preset). We do it that way, to avoid
+	# putting symlinks in /etc. Please keep the lines in the same
+	# order as the "enable" lines appear in the preset file. For a
+	# single enable line in preset, there may be more lines if the
+	# unit file had Also: clause which has units we enable here
+	# too.
+
+	# Flatcar: enable remote-fs.target
+	builddir_systemd_enable_service multi-user.target remote-fs.target
+	# Flatcar: enable remote-cryptsetup.target
+	if use cryptsetup; then
+		builddir_systemd_enable_service multi-user.target remote-cryptsetup.target
+	fi
+	# Flatcar: enable machines.target
+	builddir_systemd_enable_service multi-user.target machines.target
+	# Flatcar: enable getty@.service
+	dodir "${unitdir}/getty.target.wants"
+	dosym ../getty@.service "${unitdir}/getty.target.wants/getty@tty1.service"
+	# Flatcar: enable systemd-timesyncd.service
+	builddir_systemd_enable_service sysinit.target systemd-timesyncd.service
+	# Flatcar: enable systemd-networkd.service (Also: systemd-networkd.socket, systemd-networkd-wait-online.service)
+	builddir_systemd_enable_service multi-user.target systemd-networkd.service
+	builddir_systemd_enable_service sockets.target systemd-networkd.socket
+	builddir_systemd_enable_service network-online.target systemd-networkd-wait-online.service
+	# Flatcar: enable systemd-network-generator.service
+	builddir_systemd_enable_service sysinit.target systemd-network-generator.service
+	# Flatcar: enable systemd-resolved.service
+	builddir_systemd_enable_service multi-user.target systemd-resolved.service
+	# Flatcar: enable systemd-homed.service (Also: systemd-userdbd.service [not enabled - has no WantedBy entry])
+	if use homed; then
+		builddir_systemd_enable_service multi-user.target systemd-homed.target
+	fi
+	# Flatcar: enable systemd-userdbd.socket
+	builddir_systemd_enable_service sockets.target systemd-userdbd.socket
+	# Flatcar: enable systemd-pstore.service
+	builddir_systemd_enable_service sysinit.target systemd-pstore.service
+	# Flatcar: enable systemd-boot-update.service
+	if use boot; then
+		builddir_systemd_enable_service sysinit.target systemd-boot-update.service
+	fi
+	# Flatcar: enable reboot.target (not enabled - has no WantedBy
+	# entry)
+
+	# Flatcar: enable systemd-sysext.service by default
+	builddir_systemd_enable_service sysinit.target systemd-sysext.service
+
+	# Flatcar: Use an empty preset file, because systemctl
+	# preset-all puts symlinks in /etc, not in /usr. We don't use
+	# /etc, because it is not autoupdated. We do the "preset" above.
+	rm "${ED}/usr/lib/systemd/system-preset/90-systemd.preset" || die
+	insinto /usr/lib/systemd/system-preset
+	doins "${FILESDIR}"/99-default.preset
+
+	# Flatcar: Do not ship distro-specific files (nsswitch.conf
+	# pam.d). This conflicts with our own configuration provided
+	# by baselayout.
+	rm -rf "${ED}"/usr/share/factory
+	sed -i "${ED}"/usr/lib/tmpfiles.d/etc.conf \
+		-e '/^C!* \/etc\/nsswitch\.conf/d' \
+		-e '/^C!* \/etc\/pam\.d/d' \
+		-e '/^C!* \/etc\/issue/d'
+
+	use ukify && python_fix_shebang "${ED}"
+	use boot && secureboot_auto_sign
+}
+
+# Flatcar: Our own version of systemd_get_systemunitdir, that returns
+# a path inside /usr, not /etc.
+builddir_systemd_get_systemunitdir() {
+	echo "$(get_rootprefix)/lib/systemd/system"
+}
+
+# Flatcar: Our own version of systemd_enable_service, that does
+# operations inside /usr, not /etc.
+builddir_systemd_enable_service() {
+	local target=${1}
+	local service=${2}
+	local ud=$(builddir_systemd_get_systemunitdir)
+	local destname=${service##*/}
+
+	dodir "${ud}"/"${target}".wants && \
+	dosym ../"${service}" "${ud}"/"${target}".wants/"${destname}"
+
+	if use boot; then
+		python_fix_shebang "${ED}"
+		secureboot_auto_sign
+	fi
+}
+migrate_locale() {
+	local envd_locale_def="${EROOT}/etc/env.d/02locale"
+	local envd_locale=( "${EROOT}"/etc/env.d/??locale )
+	local locale_conf="${EROOT}/etc/locale.conf"
+
+	if [[ ! -L ${locale_conf} && ! -e ${locale_conf} ]]; then
+		# If locale.conf does not exist...
+		if [[ -e ${envd_locale} ]]; then
+			# ...either copy env.d/??locale if there's one
+			ebegin "Moving ${envd_locale} to ${locale_conf}"
+			mv "${envd_locale}" "${locale_conf}"
+			eend ${?} || FAIL=1
+		else
+			# ...or create a dummy default
+			ebegin "Creating ${locale_conf}"
+			cat > "${locale_conf}" <<-EOF
+				# This file has been created by the sys-apps/systemd ebuild.
+				# See locale.conf(5) and localectl(1).
+
+				# LANG=${LANG}
+			EOF
+			eend ${?} || FAIL=1
+		fi
+	fi
+
+	if [[ ! -L ${envd_locale} ]]; then
+		# now, if env.d/??locale is not a symlink (to locale.conf)...
+		if [[ -e ${envd_locale} ]]; then
+			# ...warn the user that he has duplicate locale settings
+			ewarn
+			ewarn "To ensure consistent behavior, you should replace ${envd_locale}"
+			ewarn "with a symlink to ${locale_conf}. Please migrate your settings"
+			ewarn "and create the symlink with the following command:"
+			ewarn "ln -s -n -f ../locale.conf ${envd_locale}"
+			ewarn
+		else
+			# ...or just create the symlink if there's nothing here
+			ebegin "Creating ${envd_locale_def} -> ../locale.conf symlink"
+			ln -n -s ../locale.conf "${envd_locale_def}"
+			eend ${?} || FAIL=1
+		fi
+	fi
+}
+
+pkg_preinst() {
+	if [[ -e ${EROOT}/etc/sysctl.conf ]]; then
+		# Symlink /etc/sysctl.conf for easy migration.
+		dosym ../../../etc/sysctl.conf /usr/lib/sysctl.d/99-sysctl.conf
+	fi
+
+	# Flatcar: This used to be in upstream ebuild, but now it's
+	# gone. We should drop it once we get rid of split-usr in SDK.
+	if ! use split-usr; then
+		local dir
+		# Flatcar: We still use separate bin and sbin, so drop usr/sbin from the list.
+		for dir in bin sbin lib; do
+			if [[ ! -L ${EROOT}/${dir} ]]; then
+				eerror "'${EROOT}/${dir}' is not a symbolic link."
+				FAIL=1
+			fi
+		done
+		if [[ ${FAIL} ]]; then
+			eerror "Migration to system layout with merged directories must be performed before"
+			eerror "installing ${CATEGORY}/${PN} with USE=\"-split-usr\" to avoid run-time breakage."
+			die "System layout with split directories still used"
+		fi
+	fi
+	if ! use boot && has_version "sys-apps/systemd[gnuefi(-)]"; then
+		ewarn "The 'gnuefi' USE flag has been renamed to 'boot'."
+		ewarn "Make sure to enable the 'boot' USE flag if you use systemd-boot."
+	fi
+}
+
+pkg_postinst() {
+	systemd_update_catalog
+
+	# Keep this here in case the database format changes so it gets updated
+	# when required.
+	systemd-hwdb --root="${ROOT}" update
+
+	udev_reload || FAIL=1
+
+	# Bug 465468, make sure locales are respected, and ensure consistency
+	# between OpenRC & systemd
+	migrate_locale
+
+	# Flatcar: We enable getty and remote-fs targets in /usr
+	# ourselves above.
+	# if [[ -z ${REPLACING_VERSIONS} ]]; then
+	# 	if type systemctl &>/dev/null; then
+	# 		systemctl --root="${ROOT:-/}" enable getty@.service remote-fs.target || FAIL=1
+	# 	fi
+	# 	elog "To enable a useful set of services, run the following:"
+	# 	elog "  systemctl preset-all --preset-mode=enable-only"
+	# fi
+
+	if [[ -L ${EROOT}/var/lib/systemd/timesync ]]; then
+		rm "${EROOT}/var/lib/systemd/timesync"
+	fi
+
+	if [[ -z ${ROOT} && -d /run/systemd/system ]]; then
+		ebegin "Reexecuting system manager (systemd)"
+		systemctl daemon-reexec
+		eend $? || FAIL=1
+
+		# https://lists.freedesktop.org/archives/systemd-devel/2024-June/050466.html
+		ebegin "Signaling user managers to reexec"
+		systemctl kill --kill-whom='main' --signal='SIGRTMIN+25' 'user@*.service'
+		eend $?
+	fi
+
+	if [[ ${FAIL} ]]; then
+		eerror "One of the postinst commands failed. Please check the postinst output"
+		eerror "for errors. You may need to clean up your system and/or try installing"
+		eerror "systemd again."
+		eerror
+	fi
+
+	if use boot; then
+		optfeature "installing kernels in systemd-boot's native layout and update loader entries" \
+			"sys-kernel/installkernel[systemd-boot]"
+	fi
+	if use ukify; then
+		optfeature "generating unified kernel image on each kernel installation" \
+			"sys-kernel/installkernel[ukify]"
+	fi
+}
+
+pkg_prerm() {
+	# If removing systemd completely, remove the catalog database.
+	if [[ ! ${REPLACED_BY_VERSION} ]]; then
+		rm -f -v "${EROOT}"/var/lib/systemd/catalog/database
+	fi
+}