openssh: add systemd unit file

And only install sysV-style script when appropiate.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/openssh/openssh.mk

@@ -17,10 +17,17 @@ OPENSSH_DEPENDENCIES += linux-pam
 OPENSSH_CONF_OPT += --with-pam
 endif
 
-define OPENSSH_INSTALL_INITSCRIPT
-	$(INSTALL) -D -m 755 package/openssh/S50sshd $(TARGET_DIR)/etc/init.d/S50sshd
+define OPENSSH_INSTALL_INIT_SYSTEMD
+	$(INSTALL) -D -m 644 package/openssh/sshd.service \
+		$(TARGET_DIR)/etc/systemd/system/sshd.service
+	mkdir -p $(TARGET_DIR)/etc/systemd/system/multi-user.target.wants
+	ln -fs ../sshd.service \
+		$(TARGET_DIR)/etc/systemd/system/multi-user.target.wants/sshd.service
 endef
 
-OPENSSH_POST_INSTALL_TARGET_HOOKS += OPENSSH_INSTALL_INITSCRIPT
+define OPENSSH_INSTALL_INIT_SYSV
+	$(INSTALL) -D -m 755 package/openssh/S50sshd \
+		$(TARGET_DIR)/etc/init.d/S50sshd
+endef
 
 $(eval $(autotools-package))

package/openssh/sshd.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=OpenSSH server daemon
+After=syslog.target network.target auditd.service
+
+[Service]
+ExecStartPre=/usr/bin/ssh-keygen -A
+ExecStart=/usr/sbin/sshd -D -e
+ExecReload=/bin/kill -HUP $MAINPID
+
+[Install]
+WantedBy=multi-user.target