[Bug 281005] www/py-gunicorn: have daemon(8) record main worker process in pidfile

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281005

            Bug ID: 281005
           Summary: www/py-gunicorn: have daemon(8) record main worker
                    process in pidfile
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: bofh@freebsd.org
          Reporter: pete@nomadlogic.org
             Flags: maintainer-feedback?(bofh@freebsd.org)
          Assignee: bofh@freebsd.org

Created attachment 253029
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=253029&action=edit
add -p to daemon to store child process pid

Currently the installed gunicorn rc.d script records the PID of the supervisor
process to /var/run/gunicorn.  This is done by passing "-P" via daemon(8).  

I am proposing we also record the primary gunicorn worker process in /var/run
as well, this will enable better integration with tools like newsyslog(8).  For
example gunicorn accepts a SIG1 signal to the main worker process to close and
reopen logfiles after rotation to the main worker as well as child process.  By
also passing "-p" to daemon we can then have newsyslog get the appropriate pid
to sent a SIG1 to.

Here are the docs on the signals gunicorn accepts, as there are other
interesting usecases this would enable as well:
https://docs.gunicorn.org/en/stable/signals.html

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