dropbear: move systemd support to meta-systemd

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>

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

@@ -0,0 +1,9 @@
+[Unit]
+Description=SSH Per-Connection Server
+Requires=dropbearkey.service
+After=syslog.target dropbearkey.service
+
+[Service]
+ExecStart=-/usr/sbin/dropbear -i -r /etc/dropbear/dropbear_rsa_host_key -p 22
+ExecReload=/bin/kill -HUP $MAINPID
+StandardInput=socket

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

@@ -0,0 +1,10 @@
+[Unit]
+Description=SSH Key Generation
+ConditionPathExists=|!/etc/dropbear/dropbear_rsa_host_key
+
+[Service]
+ExecStart=/usr/sbin/dropbearkey -t rsa -f /etc/dropbear/dropbear_rsa_host_key
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target

meta-systemd/meta-oe/recipes-core/dropbear/dropbear_2012.55.bbappend

@@ -0,0 +1,17 @@
+inherit systemd
+
+PRINC := "${@int(PRINC) + 3}"
+
+# look for files in the layer first
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+
+SRC_URI += "file://dropbearkey.service \
+            file://dropbear@.service \
+            file://dropbear.socket"
+
+SYSTEMD_PACKAGES = "${PN}-systemd"
+SYSTEMD_SERVICE_${PN}-systemd = "dropbear.socket"
+
+do_install_append() {
+	ln -sf /dev/null ${D}${systemd_unitdir}/system/dropbear.service
+}