rc.d script to start gunicorn

[Frédéric Fauberteau <triaxx%NetBSD.org@localhost>]

I have started to install taiga on a NetBSD host and I would like to 
package it in the near future. I have written a rc.d script to start the 
backend of this application which is installed in /srv/taiga/taiga-back. 
The start command works correctly but the stop one fails with the 
following message:
taiga is located in /usr/pkg/etc/rc.d
taiga not running? (check /var/run/taiga/gunicorn.log).

The pidfile contains the correct PID of the main gunicorn execution. But 
when I check ps -o "pids,args" -A | grep taiga, I get something like:
 2006 /srv/taiga/taiga-back/.venv/bin/python3.9 
/srv/taiga/taiga-back/.venv/bin/gunicorn -D -p 
/var/run/taiga/gunicorn.log -w 4 taiga.wsgi
 5531 /srv/taiga/taiga-back/.venv/bin/python3.9 
/srv/taiga/taiga-back/.venv/bin/gunicorn -D -p 
/var/run/taiga/gunicorn.log -w 4 taiga.wsgi
 9001 /srv/taiga/taiga-back/.venv/bin/python3.9 
/srv/taiga/taiga-back/.venv/bin/gunicorn -D -p 
/var/run/taiga/gunicorn.log -w 4 taiga.wsgi
17458 /srv/taiga/taiga-back/.venv/bin/python3.9 
/srv/taiga/taiga-back/.venv/bin/gunicorn -D -p 
/var/run/taiga/gunicorn.log -w 4 taiga.wsgi
18752 /srv/taiga/taiga-back/.venv/bin/python3.9 
/srv/taiga/taiga-back/.venv/bin/gunicorn -D -p 
/var/run/taiga/gunicorn.log -w 4 taiga.wsgi

I think the problem comes from the _find_processes function of 
/etc/rc.subr since /srv/taiga/taiga-back/.venv/bin/python3.9 does not 
match $command. Any idea on how handle this kind of daemon?

#!/bin/sh
#
# $NetBSD$
#
# PROVIDE: taiga
# REQUIRE: DAEMON

$_rc_subr_loaded . /etc/rc.subr

name="taiga"
pidfile="/var/run/taiga/gunicorn.log"
command="/srv/taiga/taiga-back/.venv/bin/gunicorn"
command_args="-D -p ${pidfile} -w 4 taiga.wsgi"
taiga_chdir="/srv/taiga/taiga-back"
taiga_env="PYTHONUNBUFFERED=true DJANGO_SETTINGS_MODULE=settings.config"
taiga_user="taiga"

run_rc_command "$1"