busybox http: add systemd service

Currently in a systemd based init, the httpd server is not launched. A
systemd service is needed, so add it.

Also install a CGI script that allows to use the device for the
NetworkManager connectivity check.

https://jira.digi.com/browse/DEL-6577

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-dey/recipes-core/busybox/busybox/busybox-httpd.service.in

@@ -0,0 +1,12 @@
+[Unit]
+Description=Busybox HTTP daemon
+After=network.target
+
+[Service]
+Type=forking
+ExecStart=@sbindir@/httpd -h /srv/www
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target

meta-digi-dey/recipes-core/busybox/busybox/nm

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+printf "Content-Type: text/plain; charset=utf-8\r\n"
+printf "X-NetworkManager-Status: online\r\n"
+printf "\r\n"
+printf "NetworkManager is online\r\n"

meta-digi-dey/recipes-core/busybox/busybox_1.29.%.bbappend

@@ -8,6 +8,8 @@ SRC_URI += "file://standby \
             file://busybox-ntpd \
             file://index.html \
             file://digi-logo.png \
+            file://busybox-httpd.service.in \
+            file://nm \
             file://busybox-acpid \
             file://acpid.map \
             file://pswitch-standby \
@@ -22,6 +24,11 @@ INITSCRIPT_PARAMS_${PN}-hwclock = "start 20 S . stop 20 0 6 ."
 
 FILES_${PN}_append = " ${systemd_unitdir}/system-sleep/"
 
+# HTTPD package
+FILES_${PN}-httpd_append = " ${systemd_unitdir}/system/busybox-httpd.service"
+SYSTEMD_PACKAGES += "${PN}-httpd"
+SYSTEMD_SERVICE_${PN}-httpd = "busybox-httpd.service"
+
 # NTPD package
 PACKAGES =+ "${PN}-ntpd"
 FILES_${PN}-ntpd = "${sysconfdir}/init.d/busybox-ntpd"
@@ -46,8 +53,15 @@ do_install_append() {
 		install -m 0755 ${WORKDIR}/busybox-ntpd ${D}${sysconfdir}/init.d/
 	fi
 	if grep "CONFIG_HTTPD=y" ${WORKDIR}/defconfig; then
+		install -d ${D}/srv/www/cgi-bin
 		install -m 0644 ${WORKDIR}/index.html ${D}/srv/www/
 		install -m 0644 ${WORKDIR}/digi-logo.png ${D}/srv/www/
+		install -m 0755 ${WORKDIR}/nm ${D}/srv/www/cgi-bin/
+		if ${HAS_SYSTEMD}; then
+			install -d ${D}${systemd_unitdir}/system
+			sed 's,@sbindir@,${sbindir},g' < ${WORKDIR}/busybox-httpd.service.in \
+				> ${D}${systemd_unitdir}/system/busybox-httpd.service
+		fi
 	fi
 	# Install one standby script or another depending on having systemd or not
 	if ${HAS_SYSTEMD}; then