package/systemd: Add config option for sysupdate feature

Support the new feature added with v251,
requires openssl.

Signed-off-by: Norbert Lange <nolange79@gmail.com>
Reviewed-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

package/systemd/Config.in

@@ -481,6 +481,22 @@ config BR2_PACKAGE_SYSTEMD_SYSEXT
 
 	  https://www.freedesktop.org/software/systemd/man/systemd-sysext.html
 
+config BR2_PACKAGE_SYSTEMD_SYSUPDATE
+	bool "enable sysupdate support"
+	select BR2_PACKAGE_OPENSSL
+	select BR2_PACKAGE_OPENSSL_FORCE_LIBOPENSSL
+	select BR2_PACKAGE_UTIL_LINUX_LIBFDISK
+	help
+	  systemd-sysupdate atomically updates the host OS, container
+	  images, portable service images or other sources, based on
+	  the transfer configuration files described in sysupdate.d.
+
+	  Note that the bootloader must be configured specifically to
+	  support the A/B update mechanism defined by sysupdate. Only
+	  systemd-boot does this out of the box.
+
+	  https://www.freedesktop.org/software/systemd/man/systemd-sysupdate.html
+
 config BR2_PACKAGE_SYSTEMD_SYSUSERS
 	bool "enable sysusers support"
 	help

package/systemd/systemd.mk

@@ -91,7 +91,6 @@ SYSTEMD_CONF_OPTS += \
 	-Dsulogin-path=/usr/sbin/sulogin \
 	-Dsystem-gid-max=999 \
 	-Dsystem-uid-max=999 \
-	-Dsysupdate=false \
 	-Dsysvinit-path= \
 	-Dsysvrcnd-path= \
 	-Dtelinit-path= \
@@ -494,6 +493,12 @@ else
 SYSTEMD_CONF_OPTS += -Dsysext=false
 endif
 
+ifeq ($(BR2_PACKAGE_SYSTEMD_SYSUPDATE),y)
+SYSTEMD_CONF_OPTS += -Dsysupdate=true
+else
+SYSTEMD_CONF_OPTS += -Dsysupdate=false
+endif
+
 ifeq ($(BR2_PACKAGE_SYSTEMD_NETWORKD),y)
 SYSTEMD_CONF_OPTS += -Dnetworkd=true
 SYSTEMD_NETWORKD_USER = systemd-network -1 systemd-network -1 * - - - systemd Network Management