nginx: use UCI configuration provided by nginx-util

* update to version 1.19.6

* remove default configuration files and documentation as
  they are in the package `nginx-util`.

* do not install a `/etc/nginx/nginx.conf` file.

* use the dynamic `/etc/nginx/uci.conf` if the symlink (to
  `/var/lib/nginx/uci.conf`) is not dead after calling
  `nginx-util init_lan` (else try `/etc/nginx/nginx.conf`)

* replace nginx package by a dummy depending on `nginx-ssl`;
  the dummies will be removed after a transition period.

Signed-off-by: Peter Stadler <peter.stadler@student.uibk.ac.at>

net/nginx/files/nginx.init

@@ -20,9 +20,13 @@ nginx_init() {
 	[ -d /var/log/nginx ] || mkdir -p /var/log/nginx
 	[ -d /var/lib/nginx ] || mkdir -p /var/lib/nginx
 
+	rm -f "$(readlink "${UCI_CONF}")"
 	${NGINX_UTIL} init_lan
 
-	CONF="${NGINX_CONF}"
+	if [ -e "${UCI_CONF}" ]
+	then CONF="${UCI_CONF}"
+	else CONF="${NGINX_CONF}"
+	fi
 
 	local message
 	message="$(/usr/sbin/nginx -t -c "${CONF}" -g "${G_OPTS}" 2>&1)" ||
@@ -51,16 +55,14 @@ start_service() {
 }
 
 
-service_triggers() {
-	procd_add_reload_interface_trigger loopback
-	procd_add_reload_interface_trigger lan
-}
-
-
 reload_service() {
 	nginx_init
 
-	procd_send_signal nginx
+	if [ "$(cat "/proc/$(cat "/var/run/nginx.pid")/cmdline")" = \
+	     "nginx: master process /usr/sbin/nginx -c ${CONF} -g ${G_OPTS}" ]
+	then procd_send_signal nginx
+	else restart
+	fi
 }