Hello,

I have implemented a non-forking service readiness notification that is compatible with the s6 service supervision suite as well as my own personal fork of Upstart.

Would you accept a patch to support this protocol, which would:

• accept a CLI argument telling nsd when to use the mechanism
• grab an fd number from the environment and write a newline to it
• close the fd and unset the environment variable

The patch would look largely similar to swaywm/swaylock#42 or apple/cups#5507.

More information on the mechanism can be found at https://gitlab.com/chinstrap/ready

Regards,
Cameron Nemo