Serge E. Hallyn:
If making changes to daemons were going to palatable, [...]
Clearly, it *is* palatable, given that a few people have been adding the systemd mechanism to their programs for several years, now. Pierre-Yves Ritschard's code and Cameron Norman's code come straight out of actual service programs.
Serge E. Hallyn:
you are arguing for parsing stdout for a text message and/or using pidfiles (written to an fd)
No, M. Bercot is not. Quite the opposite, in fact. The s6 readiness mechanism demands *neither* pidfiles *nor* standard output. It's *any* file descriptor (as defined by the service), and *just a linefeed* followed by closing the descriptor.
I'm nodding at almost everything M. Bercot is saying here, by the way. * http://jdebp.uk./FGA/unix-daemon-readiness-protocol-problems.html
