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[Unit]
Description=Minecraft Server Backup Task - %i
After=network.target
ConditionDirectoryNotEmpty=/srv/minecraft/%i
PartOf=minecraft@%i.service

[Service]
Type=oneshot
WorkingDirectory=/srv/minecraft/%i

User=minecraft
Group=minecraft

StandardOutput=journal
StandardError=journal

PrivateUsers=true
ProtectSystem=full
ProtectHome=true
ProtectKernelTunables=true
ProtectKernelModules=true
ProtectControlGroups=true
NoNewPrivileges=true

# Set default variables
Environment="BACKUP_PATH=/srv/minecraft/%i/backups"

# Override default variable values in environment file
EnvironmentFile=-/srv/minecraft/%i/systemd.conf

# create the backup folder
ExecStartPre=/bin/sh -c '/bin/mkdir -p "${BACKUP_PATH}"'

# stop world saving
ExecStartPre=/bin/sh -c "if [ -p /srv/minecraft/%i/systemd.stdin ]; then /bin/echo save-off > /srv/minecraft/%i/systemd.stdin; fi"
ExecStartPre=/bin/sh -c "if [ -p /srv/minecraft/%i/systemd.stdin ]; then /bin/echo save-all > /srv/minecraft/%i/systemd.stdin; fi"
ExecStartPre=/bin/sh -c "if [ -p /srv/minecraft/%i/systemd.stdin ]; then /bin/echo 'say backup starting' > /srv/minecraft/%i/systemd.stdin; fi"

# run the backup
ExecStart=/bin/sh -c '/bin/tar --exclude="${BACKUP_PATH}" -cjf ${BACKUP_PATH}/%i-"$(/bin/date +%%y-%%m-%%d-%%H.%%M)".tar.bz2 $(/bin/pwd)'

# turn world saving back on
ExecStopPost=/bin/sh -c "if [ -p /srv/minecraft/%i/systemd.stdin ]; then /bin/echo save-on > /srv/minecraft/%i/systemd.stdin; fi"
ExecStopPost=/bin/sh -c "if [ -p /srv/minecraft/%i/systemd.stdin ]; then /bin/echo save-all > /srv/minecraft/%i/systemd.stdin; fi"
ExecStopPost=/bin/sh -c "if [ -p /srv/minecraft/%i/systemd.stdin ]; then /bin/echo 'say backup complete' > /srv/minecraft/%i/systemd.stdin; fi"

[Install]
WantedBy=multi-user.target