[__jool] Use explorer to determine alpine kernel version.

type/__jool/explorer/alpine-kernel-modules

@@ -0,0 +1,13 @@
+#!/bin/sh
+# Explorer for the __jool type to determine if we need the -virt or the -lts modules.
+
+[ "$(sh -e "${__explorer:?}"/os)" = 'alpine' ] || exit 0
+
+case $(uname -r) in
+*-virt)
+	printf "jool-modules-virt"
+	;;
+*-lts)
+	printf "jool-modules-lts"
+	;;
+esac

type/__jool/man.rst

@@ -36,13 +36,6 @@ pool6
     The IPv6 prefix used to map IPv4 addresses, `64:ff9b::/96` if unspecified.
 
 
-BOOLEAN PARAMETERS
-------------------
-vm
-    Wether this instance is running in a VM or not: configures the kernel
-    modules that will be installed.
-
-
 EXAMPLES
 --------
 

type/__jool/manifest

@@ -23,7 +23,7 @@ os=$(cat "${__global:?}/explorer/os")
 
 case "$os" in
 'alpine')
-	:
+	packages="jool-tools jool-tools-openrc $(cat "${__object:?}"/explorer/alpine-kernel-modules)"
 	;;
 *)
 	printf "This type has no implementation for %s. Please contribute one if you can.\n" "$os"
@@ -31,15 +31,7 @@ case "$os" in
 	;;
 esac
 
-
-if [ -f "${__object:?}/parameter/vm" ];
-then
-	kernel_modules="jool-modules-virt"
-else
-	kernel_modules="jool-modules-lts"
-fi
-
-for pkg in jool-tools jool-tools-openrc "$kernel_modules";
+for pkg in $packages;
 do
 	__package "$pkg"
 done