#!/bin/sh

for BINARY in icingadb-redis-server icingadb-redis-sentinel
do
	for MODE in default templated
	do
		case "${BINARY}" in
		icingadb-redis-server)
		    ICINGA="icingadb-"
            SRC="redis"
            NAME="${ICINGA}${SRC}"
			;;
		icingadb-redis-sentinel)
			ICINGA="icingadb-"
            SRC="sentinel"
            NAME="${ICINGA}${SRC}"
			;;
		esac

		case "${MODE}" in
		default)
			EXTRA="Alias=${NAME}.service"
			TARGET="debian/${BINARY}.service"
			NAMESPACED="${SRC}"
			SPACEDNAME="${NAME}"
			DESCRIPTION="Advanced key-value store"
			;;
		templated)
			EXTRA=""
			TARGET="debian/${BINARY}@.service"
			NAMESPACED="${SRC}-%i"
			SPACEDNAME="${NAME}-%i"
			DESCRIPTION="Advanced key-value store (%I)"
			;;
		esac

		: >${TARGET}

		if [ "${MODE}" = "templated" ]
		then
			cat >> ${TARGET} <<EOF
# Templated service file for ${BINARY}(1)
#
# Each instance of ${BINARY} requires its own configuration file:
#
#   $ cp /etc/icingadb-redis/${NAME}.conf /etc/icingadb-redis/${NAME}-myname.conf
#   $ chown icingadb-redis:icingadb-redis /etc/icingadb-redis/${NAME}-myname.conf
#
# Ensure each instance is using their own database:
#
#   $ sed -i -e 's@^dbfilename .*@dbfilename dump-myname.rdb@' /etc/icingadb-redis/${NAME}-myname.conf
#
# We then listen exlusively on UNIX sockets to avoid TCP port collisions:
#
#   $ sed -i -e 's@^port .*@port 0@' /etc/icingadb-redis/${NAME}-myname.conf
#   $ sed -i -e 's@^\\(# \\)\\{0,1\\}unixsocket .*@unixsocket /var/run/${NAME}-myname/${BINARY}.sock@' /etc/icingadb-redis/${NAME}-myname.conf
#
# ... and ensure we are logging, etc. in a unique location:
#
#   $ sed -i -e 's@^logfile .*@logfile /var/log/icingadb-redis/${BINARY}-myname.log@' /etc/icingadb-redis/${NAME}-myname.conf
#   $ sed -i -e 's@^pidfile .*@pidfile /run/icingadb-redis-myname/${BINARY}.pid@' /etc/icingadb-redis/${NAME}-myname.conf
#
# We can then start the service as follows, validating we are using our own
# configuration:
#
#   $ systemctl start ${BINARY}@myname.service
#   $ icingadb-redis-cli -s /var/run/${NAME}-myname/${BINARY}.sock info | grep config_file
#
#  -- Chris Lamb <lamby@debian.org>  Mon, 09 Oct 2017 22:17:24 +0100
EOF
		fi

		cat >> ${TARGET} <<EOF
[Unit]
Description=${DESCRIPTION}
After=network.target
Documentation=http://redis.io/documentation, man:${BINARY}(1)

[Service]
Type=notify
ExecStart=/usr/bin/${BINARY} /etc/icingadb-redis/${NAME}.conf --supervised systemd
ExecStop=/bin/kill -s TERM \$MAINPID
PIDFile=/run/${SPACEDNAME}/${BINARY}.pid
TimeoutStopSec=0
Restart=always
User=icingadb-redis
Group=icingadb-redis
RuntimeDirectory=${SPACEDNAME}
RuntimeDirectoryMode=2755

UMask=007
PrivateTmp=yes
LimitNOFILE=65535
PrivateDevices=yes
ProtectHome=yes
ReadOnlyDirectories=/
ReadWriteDirectories=-/var/lib/icingadb-redis
ReadWriteDirectories=-/var/log/icingadb-redis
ReadWriteDirectories=-/run/${SPACEDNAME}

NoNewPrivileges=true
CapabilityBoundingSet=CAP_SETGID CAP_SETUID CAP_SYS_RESOURCE
MemoryDenyWriteExecute=true
ProtectKernelModules=true
ProtectKernelTunables=true
ProtectControlGroups=true
RestrictRealtime=true
RestrictNamespaces=true
RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX

# ${BINARY} can write to its own config file when in cluster mode so we
# permit writing there by default. If you are not using this feature, it is
# recommended that you replace the following lines with "ProtectSystem=full".
ProtectSystem=true
ReadWriteDirectories=-/etc/icingadb-redis

[Install]
WantedBy=multi-user.target
EOF
		if [ "${EXTRA}" != "" ]
		then
			echo "${EXTRA}" >> "${TARGET}"
		fi
	done
done
