openvpn: bring back openvpn.service file

Restore the openvpn.service file from packaging of openvpn 2.3.6, so we
can still start it the same way (as currently described in manuals).

Related: SYS#6303
Change-Id: I2cf96bc1ecca79ae98be1181fbd3c15edad15ca8

recipes-config/sysmocom-openvpn-config/sysmocom-openvpn-config/sysmocom-vpn.conf

@@ -1,12 +1,12 @@
 #OpenVPN client conf
 tls-client
 client
-ns-cert-type server
+remote-cert-tls server
 dev tun
 proto udp
 tun-mtu 1500
-remote admin.sysmocom.de
+remote vpn.sysmocom.de
 comp-lzo
 pkcs12 sysmocom-client-cert.p12
-cipher BF-CBC
+cipher AES-256-CBC
 nobind

recipes-config/sysmocom-openvpn-config/sysmocom-openvpn-config_1.bb

@@ -5,7 +5,7 @@ LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
 
 SRC_URI = "file://sysmocom-vpn.conf"
-PR = "r6"
+PR = "r7"
 
 CONFFILES_${PN} = "${sysconfdir}/openvpn/sysmocom-vpn.conf"
 PACKAGE_ARCH = "all"

recipes-extra/openvpn/openvpn/openvpn.service

@@ -0,0 +1,18 @@
+# This service is actually a systemd target,
+# but we are using a service since targets cannot be reloaded.
+
+[Unit]
+Description=OpenVPN service
+After=network.target
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/bin/true
+ExecReload=/bin/true
+WorkingDirectory=/etc/openvpn
+
+[Install]
+WantedBy=multi-user.target
+
+

recipes-extra/openvpn/openvpn_2.5.8.bb

@@ -7,9 +7,12 @@ DEPENDS = "lzo openssl iproute2 ${@bb.utils.contains('DISTRO_FEATURES', 'pam', '
 
 inherit autotools systemd update-rc.d pkgconfig
 
+PR = "r1"
+
 SRC_URI = "http://swupdate.openvpn.org/community/releases/${BP}.tar.gz \
            file://0001-configure.ac-eliminate-build-path-from-openvpn-versi.patch \
            file://openvpn \
+           file://openvpn.service \
           "
 
 UPSTREAM_CHECK_URI = "https://openvpn.net/community-downloads"
@@ -62,6 +65,9 @@ do_install_append() {
     install -m 644 ${S}/sample/sample-scripts/* ${D}${sysconfdir}/openvpn/sample/sample-scripts
 
     install -d -m 710 ${D}/${localstatedir}/lib/openvpn
+
+    # Keep openvpn.service to match manuals (SYS#6303)
+    install -m 0644 ${WORKDIR}/openvpn.service ${D}${systemd_system_unitdir}
 }
 
 PACKAGES =+ " ${PN}-sample "
@@ -71,6 +77,7 @@ RRECOMMENDS_${PN} = "kernel-module-tun"
 FILES_${PN}-dbg += "${libdir}/openvpn/plugins/.debug"
 FILES_${PN} += "${systemd_system_unitdir}/openvpn-server@.service \
                 ${systemd_system_unitdir}/openvpn-client@.service \
+                ${systemd_system_unitdir}/openvpn.service \
                 ${nonarch_libdir}/tmpfiles.d \
                "
 FILES_${PN}-sample = "${sysconfdir}/openvpn/sample/ \