[Unit]
Description=Dress to Impress webapp

[Service]
User=impress
Restart=always
WorkingDirectory=/srv/impress/current
ExecStart=/opt/ruby-{{ ruby_version }}/bin/bundle exec falcon host
Environment="RAILS_ENV=production"
; Set EXECJS_RUNTIME to save us from needing to install Node
Environment="EXECJS_RUNTIME=Disabled"
EnvironmentFile=/srv/impress/shared/production.env

; Kill the app at 1.2GB of RAM.
; NOTE: It's generally recommended to pair this with a `MemoryHigh` setting, to
; try throttling memory usage before killing altogether. But at time of writing,
; our app has a memory leak that causes it to always keep growing - and then the
; throttling *successfully* keeps it within the RAM limits, just running very
; slowly. Instead, let's always reboot it when it gets too high, and hopefully
; find and fix that leak sometime!
MemoryMax=1.2G

; Some security directives, adapted from Akkoma's service file, they seem like sensible defaults!
; Use private /tmp and /var/tmp folders inside a new file system namespace, which are discarded after the process stops.
PrivateTmp=true
; The /home, /root, and /run/user folders can not be accessed by this service anymore. If your Akkoma user has its home folder in one of the restricted places, or use one of these folders as its working directory, you have to set this to false.
ProtectHome=true
; Mount /usr, /boot, and /etc as read-only for processes invoked by this service.
ProtectSystem=full
; Sets up a new /dev mount for the process and only adds API pseudo devices like /dev/null, /dev/zero or /dev/random but not physical devices.
PrivateDevices=true
; Ensures that the service process and all its children can never gain new privileges through execve().
NoNewPrivileges=true
; Drops the sysadmin capability from the daemon.
CapabilityBoundingSet=~CAP_SYS_ADMIN

[Install]
WantedBy=multi-user.target