dropbear: add systemd unit files

This patch mainly comes from meta-systemd with a few modifications.
The purpose is to get rid of the LSB init scripts in systemd images.

[YOCTO #4420]

(From OE-Core rev: 5d90c5ebdb899b2951c97a94ff57867c1e491c15)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/dropbear/dropbear.inc

@@ -19,17 +19,22 @@ SRC_URI = "http://matt.ucc.asn.au/dropbear/releases/dropbear-${PV}.tar.bz2 \
            file://0004-fix-2kb-keys.patch \
            file://0007-dropbear-fix-for-x32-abi.patch \
            file://init \
+           file://dropbearkey.service \
+           file://dropbear@.service \
+           file://dropbear.socket \
            ${@base_contains('DISTRO_FEATURES', 'pam', '${PAM_SRC_URI}', '', d)} "
 
 PAM_SRC_URI = "file://0005-dropbear-enable-pam.patch \
                file://0006-dropbear-configuration-file.patch \
                file://dropbear"
 
-inherit autotools update-rc.d
+inherit autotools update-rc.d systemd
 
 INITSCRIPT_NAME = "dropbear"
 INITSCRIPT_PARAMS = "defaults 10"
 
+SYSTEMD_SERVICE_${PN} = "dropbear.socket"
+
 CFLAGS_prepend = " -I. "
 LD = "${CC}"
 
@@ -66,6 +71,16 @@ do_install() {
 		install -d ${D}${sysconfdir}/pam.d
 		install -m 0644 ${WORKDIR}/dropbear  ${D}${sysconfdir}/pam.d/
 	fi
+
+	# deal with systemd unit files
+	install -d ${D}${systemd_unitdir}/system
+	install -m 0644 ${WORKDIR}/dropbearkey.service ${D}${systemd_unitdir}/system
+	install -m 0644 ${WORKDIR}/dropbear@.service ${D}${systemd_unitdir}/system
+	install -m 0644 ${WORKDIR}/dropbear.socket ${D}${systemd_unitdir}/system
+	sed -i -e 's,@BASE_BINDIR@,${base_bindir},g' \
+	       -e 's,@BINDIR@,${bindir},g' \
+	       -e 's,@SBINDIR@,${sbindir},g' \
+	       ${D}${systemd_unitdir}/system/dropbear.socket ${D}${systemd_unitdir}/system/*.service
 }
 
 inherit update-alternatives

meta/recipes-core/dropbear/dropbear/dropbear.socket

@@ -0,0 +1,10 @@
+[Unit]
+Conflicts=dropbear.service
+
+[Socket]
+ListenStream=22
+Accept=yes
+
+[Install]
+WantedBy=sockets.target
+Also=dropbearkey.service

meta/recipes-core/dropbear/dropbear/dropbear@.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=SSH Per-Connection Server
+Wants=dropbearkey.service
+After=syslog.target dropbearkey.service
+
+[Service]
+EnvironmentFile=-/etc/default/dropbear
+ExecStart=-@SBINDIR@/dropbear -i -r /etc/dropbear/dropbear_rsa_host_key $DROPBEAR_EXTRA_ARGS
+ExecReload=@BASE_BINDIR@/kill -HUP $MAINPID
+StandardInput=socket
+KillMode=process

meta/recipes-core/dropbear/dropbear/dropbearkey.service

@@ -0,0 +1,8 @@
+[Unit]
+Description=SSH Key Generation
+ConditionPathExists=|!/etc/dropbear/dropbear_rsa_host_key
+
+[Service]
+Type=oneshot
+ExecStart=@SBINDIR@/dropbearkey -t rsa -f /etc/dropbear/dropbear_rsa_host_key
+RemainAfterExit=yes