working on systemd service to start server

etc/change_hardcoded_username_first/mts-ENLIVEN.service

@@ -0,0 +1,14 @@
+[Unit]
+description "Job that runs mts-ENLIVEN minetest server as specific user"
+After=network.target
+
+[Service]
+Type=simple
+Environment=statedir=/var/cache/mts-ENLIVEN
+ExecStartPre=/usr/bin/mkdir -p ${statedir}
+User=owner
+Group=owner
+ExecStart=/home/owner/minetest/bin/minetestserver --gameid ENLIVEN --worldname FCAGameAWorld
+
+[Install]
+WantedBy=multi-user.target

etc/change_hardcoded_username_first/runme after installing stuff in etc.sh

@@ -1,5 +1,27 @@
 #!/bin/sh
 
-#enable the mts-ENLIVEN upstart service (after you've copied it) on Ubuntu:
+#This is a systemd startup unit, and will only work if your system is running systemd
+#(see https://wiki.ubuntu.com/SystemdForUpstartUsers or https://www.freedesktop.org/software/systemd/man/systemd.service.html
+# and https://www.freedesktop.org/software/systemd/man/systemd.exec.html# --discusses execution options such as User)
+#* Ignores invalid directives and starts the service ...
+#  systemd-analyze verify <unit> file to get warnings on typos and badly formatted options.
+#* requires full path, so ExecStart=/bin/sleep 20 works but ExecStart=sleep 20 does not.
+
+
+## Known Issues
+# * should use machinectl shell instead of su or sudo as of 2016 updates to systemd
+# * Restart=on-abort and RestartSec=3 settings could be used (but probably shouldn't, so minetest crash can be noticed [and debugged more easily by viewing tail of debug log])
+# * Maybe for ExecStart, instead use:
+#   su owner "screen -S MinetestServer /home/owner/minetest/bin/minetestserver --gameid ENLIVEN --worldname FCAGameAWorld"
+#   OR
+#   sudo -u owner screen -S MinetestServer /home/owner/minetest/bin/minetestserver --gameid ENLIVEN --worldname FCAGameAWorld
+#   instead of User=owner
+
+#Update the unit:
+wget https://github.com/expertmm/EnlivenMinetest/raw/master/etc/change_hardcoded_username_first/mts-ENLIVEN.service
+echo "This will only work if you are using systemd."
+sudo mv -f mts-ENLIVEN.service /etc/init.d/
+#? sudo mv -f mts-ENLIVEN.service /etc/systemd/system/
+#enable the mts-ENLIVEN systemd service on Ubuntu:
 sudo service mts-ENLIVEN enable
 sudo service mts-ENLIVEN start

etc/change_hardcoded_username_first/upstart_version/install and start service.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+echo "This doesn't work on Xenial since Ubuntu switched from Canonical upstart to systemd (unless you manually switched to upstart)"
+wget https://github.com/expertmm/EnlivenMinetest/raw/master/etc/change_hardcoded_username_first/upstart_version/etc/init.d/mts-ENLIVEN.conf
+sudo mv -f mts-ENLIVEN.conf /etc/init.d/
+#enable the mts-ENLIVEN upstart service on Ubuntu:
+sudo service mts-ENLIVEN enable
+sudo service mts-ENLIVEN start

etc/change_hardcoded_username_first/upstart_version/mts-ENLIVEN.conf

@@ -0,0 +1,13 @@
+description "Job that runs mts-ENLIVEN minetest server as specific user"
+
+# start in normal runlevels when disks are mounted and networking is available
+start on runlevel [2345]
+
+# stop on shutdown/halt, single-user mode and reboot
+stop on runlevel [016]
+
+#env statedir=/var/cache/mts-ENLIVEN
+# create a directory needed by the daemon
+#pre-start exec mkdir -p "$statedir"
+
+exec sudu -u owner /home/owner/mts-ENLIVEN