Add systemd service if applicable for autostart

[waywardone]

More recent versions of Raspbian use systemd to manage application starts.

• Add OpenSprinkler.systemd - a systemd service template for OpenSprinkler
• Update build.sh to install the systemd service if appropriate.

NOTE: The check for the directory /run/systemd/system may not be foolproof across distros but is a good enough check for the Raspberry Pi and Raspbian IMO.

[kpfleming]

Thanks for doing this; I'm about to do it as well, although I want to have the software running as a non-root user which complicates things somewhat.

[WillCodeForCats]

I added the following on my system to avoid network errors at boot time:

After=network-online.target
Wants=network-online.target

[WillCodeForCats]

I tried running as a non-root user at first (as user ospi group ospi) and it worked for the most part, except for the reboot function in the UI didn't work. I installed under /opt/ospi with the following unit file:

/etc/systemd/system/opensprinkler.service

[Unit]
Description=OpenSprinkler Raspberry Pi
After=network-online.target
Wants=network-online.target
 
[Service]
Type=exec
#User=ospi
#Group=ospi
Restart=on-failure
ExecStart=/opt/ospi/OpenSprinkler
WorkingDirectory=/opt/ospi

[Install]
WantedBy=multi-user.target

I didn't look to see how the reboot function is working in code to see if it could be modified to work at non-root.

[rayshobby]

Thanks for the proposal. This has been addressed by the recent PR #295