First check in after re-naming snap to sl. This involved a lot of variable renaming and there are likely a number of other little hacks and tweaks.

ROOT/etc/sl.d/templates/container/packages

@@ -0,0 +1,57 @@
+#
+# These packages are the bare minimum necessary for a functional system.
+# This file is required for snapinstall to function, so don't delete it!
+#
+
+snap-base
+dash
+texinfo
+glibc
+coreutils
+libacl
+libattr
+libcap
+ncurses
+readline
+tzdata
+perl
+binutils
+bzip2
+cpio
+dhclient
+e2fsprogs
+ex
+findutils
+gawk
+gdbm
+gmp
+grep
+groff
+gzip
+iana-etc
+iftools
+inetutils
+iproute2
+kmod
+less
+libgcc
+libpipeline
+libstdc++
+libzfs
+linux-firmware
+man-db
+mpfr
+net-tools
+procps-ng
+psmisc
+sed
+shadow
+tar
+snap
+initscripts
+sysklogd
+sysvinit
+tar
+util-linux
+xz
+zlib

ROOT/etc/sl.d/templates/server/packages

@@ -0,0 +1,63 @@
+#
+# This is a basic server install which includes openssh-server along with
+# other packages typically expected on servers
+#
+
+binutils
+bzip2
+coreutils
+cpio
+cron
+dash
+dhclient
+e2fsprogs
+eudev
+ex
+findutils
+gawk
+gdbm
+glibc
+gmp
+grep
+groff
+grub
+gzip
+iana-etc
+iftools
+inetutils
+initscripts
+iproute2
+kmod
+less
+libacl
+libattr
+libcap
+libgcc
+libpipeline
+libstdc++
+libzfs
+linux
+man-db
+mkinitramfs
+mpfr
+ncurses
+net-tools
+openssh-client
+openssh-server
+perl
+procps-ng
+psmisc
+readline
+rsyslog
+sed
+shadow
+snap
+snap-base
+sysvinit
+tar
+tar
+texinfo
+tzdata
+util-linux
+xz
+zlib

ROOT/etc/sl.d/templates/server/postinst

@@ -0,0 +1,45 @@
+#!/bin/sh
+
+### PLACEHOLDER ###
+# This script needs to provide things like network setup perhaps
+
+# This code should help with setting up the network interfaces
+#
+#my $dir = '/sys/class/net';
+#my $devs = {};
+#
+#opendir( my $dh, $dir ) || die( $! );
+#
+#while ( readdir( $dh ) ) {
+#	my $link = readlink( "$dir/$_" ) || next;
+#
+#	if ( $link =~ /virtual/ ) {
+#		next;
+#		}
+#
+#	open( my $fh, "$dir/$_/address" ) || die( $! );
+#	$devs->{$_}{'mac'} = <$fh>;
+#	close( $fh );
+#
+#	chomp( $devs->{$_}{'mac'} );
+#	}
+#
+#foreach my $dev ( sort( keys( %$devs ) ) ) {
+#	print "$dev - $devs->{$dev}{'mac'}\n";
+#	}
+
+if [ -n "$HOSTNAME" ]; then
+  cat > /etc/hostname <<EOF
+$HOSTNAME
+EOF
+fi
+
+if [ -n "$ROOTPW" ]; then
+  chpasswd <<EOF
+root:$ROOTPW
+EOF
+fi
+
+if [ -n "$TZFILE" ]; then
+  ln -s "$TZFILE" /etc/localtime
+fi