New comment by Duncaen on void-packages repository

https://github.com/void-linux/void-packages/pull/46165#issuecomment-1730085677

Comment:
    [ -z "$SBCTL_SIGN_KERNEL" ] && exit 0
    [ -e "boot/vmlinuz-${VERSION}" ] && sign "boot/vmlinuz-${VERSION}"
    [ -e "boot/vmlinux-${VERSION}" ] && sign "boot/vmlinux-${VERSION}"
    
/etc/default/sbctl-kernel-hook:

    # SBCTL_SIGN_KERNEL=yes

I guess the set vs yes/no/1/0 is arguable, seems like other hooks tend to check for 1/0, other things like xbps-src and such use the -n/-z style.