freebsd rc scripts and env(1) shebang are not friends

setup_env_rc_test_scenario.sh

#!/bin/sh

# Create dummy python script which uses env for shebang.
cat << EOF > /usr/local/bin/foo
#!/usr/bin/env python2.7
print("Hello foo")
EOF

# turn on executable bit
chmod +x /usr/local/bin/foo

# create FreeBSD rc script with command_interpreter specified.
cat << EOF > /usr/local/etc/rc.d/foo
#!/bin/sh
#
# PROVIDE: foo

. /etc/rc.subr

name="foo"
rcvar=foo_enable
command_interpreter="/usr/local/bin/python2.7"
command="/usr/local/bin/foo"

load_rc_config \$name
run_rc_command \$1
EOF

# turn on executable bit
chmod +x /usr/local/etc/rc.d/foo

# enable foo
echo "foo_enable=\"YES\"" >> /etc/rc.conf