__update_alternatives: add state explorer

cdist/conf/type/__update_alternatives/explorer/state

@@ -0,0 +1,8 @@
+#!/bin/sh -e
+path="$(cat "$__object/parameter/path")"
+name="$__object_id"
+link="$(readlink "/etc/alternatives/$name")"
+if [ "$path" = "$link" ]
+then echo present
+else echo absent
+fi

cdist/conf/type/__update_alternatives/gencode-remote

@@ -21,6 +21,10 @@
 # Setup alternative - no standard way to create, always set
 #
 
+if [ "$(cat "$__object/explorer/state")" = 'present' ]
+then exit 0
+fi
+
 path="$(cat "$__object/parameter/path")"
 name="$__object_id"
 echo "update-alternatives --quiet --set '$name' '$path'"