While it is unwise to transform shutdown signals in s6-supervise , I think the customisation is achievable in s6-rc by adding a file in the service definition directory which specifies the signal (defaults to SIGTERM) to send to the daemon process. Any comments on this?
 <https://skarnet.org/cgi-bin/archive.cgi? 2:mss:1460:migbpolhlbhalejhigle>. -- My current OpenPGP key: RSA4096/0x227E8CAAB7AA186C (expires: 2020.10.19) 7077 7781 B859 5166 AE07 0286 227E 8CAA B7AA 186C