switch to s6-linux-init and s6-rc

This is at the point where it runs a getty and a pile of s6-supervise
processes, though it doesn't seem to run the things being supervised

pkgs/s6-init-files/scripts/rc.init

@@ -0,0 +1,42 @@
+#!/usr/bin/env sh
+
+rl="$1"
+shift
+
+### argv now contains the arguments of the kernel command line that are
+### not of the form key=value. (The key=value arguments were stored by
+### s6-linux-init into an envdir, if instructed so via the -s option.)
+### Normally this argv remains unused because programs that need the
+### kernel command line usually read it later on from /proc/cmdline -
+### but just in case, it's available here.
+
+
+### 1. Early preparation
+### This is done only once at boot time.
+### Ideally, this phase should just initialize the service manager.
+
+### If your services are managed by s6-rc:
+### (replace /run/service with your scandir)
+s6-rc-init /run/service -d -c /etc/s6-rc/compiled
+
+
+### 2. Starting the wanted set of services
+### This is also called every time you change runlevels with telinit.
+### (edit the location to suit your installation)
+### By default, $rl is the string "default", unless you changed it
+### via the -D option to s6-linux-init-maker.
+### Numeric arguments from 1 to 5 on the kernel command line will
+### override the default.
+
+exec /etc/s6-linux-init/current/scripts/runlevel "$rl"
+
+
+### If this script is run in a container, then 1. and 2. above do not
+### apply and you should just call your CMD, if any, or let your
+### services run.
+### Something like this:
+
+# if test -z "$*" ; then return 0 ; fi
+# $@
+# echo $? > /run/s6-linux-init-container-results/exitcode
+# halt

pkgs/s6-init-files/scripts/rc.shutdown

@@ -0,0 +1,19 @@
+#!/usr/bin/env sh
+
+
+### Things to do before hardware halt/reboot/poweroff.
+### Ideally, it should be a single call to the service manager,
+### telling it to bring all the services down.
+
+### If your s6-linux-init-maker invocation was made with the -1
+### option, messages from rc.shutdown will appear on /dev/console
+### as well as be logged by the catch-all logger.
+### If your s6-linux-init-maker invocation did NOT include the -1
+### option, messages from rc.shutdown will only be logged by the
+### catch-all logger and will NOT appear on /dev/console. In order
+### to print them to /dev/console instead, you may want to
+### uncomment the following line:
+exec >/dev/console 2>&1
+
+### If your services are managed by s6-rc:
+exec s6-rc -v2 -bDa change

pkgs/s6-init-files/scripts/rc.shutdown.final

@@ -0,0 +1,18 @@
+#!/nix/store/xbdqbi2mscmhl5wcpbgpjdwxbsrvpkil-bash-5.1-p16/bin/sh -e
+
+### Things to do *right before* the machine gets rebooted or
+### powered off, at the very end of the shutdown sequence,
+### when all the filesystems are unmounted.
+
+### This is a last resort hook; normally nothing should be
+### done here (your rc.shutdown script should have taken care
+### of everything) and you should leave this script empty.
+
+### Some distributions, however, may need to perform some
+### actions after unmounting the filesystems: typically if
+### an additional teardown action is required on a filesystem
+### after unmounting it, or if the system needs to be
+### pivot_rooted before it can be shut down, etc.
+
+### Those are all exceptional cases. If you don't know for
+### certain that you need to do something here, you don't.

pkgs/s6-init-files/scripts/runlevel

@@ -0,0 +1,12 @@
+#!/usr/bin/env sh -e
+
+### This script is called once at boot time by rc.init, and is
+### also called by the runleveld service every time the user
+### requests a machine state change via telinit.
+### Ideally, it should just be a call to the service manager.
+
+test "$#" -gt 0 || { echo 'runlevel: fatal: too few arguments' 1>&2 ; exit 100 ; }
+
+
+### If your services are managed by s6-rc:
+exec s6-rc -v2 -up change "$1"