Updated the exlorer for more systems

changed the ps syntax, so it should work on freebsd to
  added a case so it could easy implemented for other os to

cdist/conf/explorer/init

@@ -18,7 +18,19 @@
 # along with cdist. If not, see <http://www.gnu.org/licenses/>.
 #
 #
-# Check whether the given name will be started on boot or not
+# Returns the process name of pid 1 ( normaly the init system )
+# for example at linux this value is "init" or "systemd" in most cases
 #
 
-ps -o comm= --pid 1
+uname_s="$(uname -s)"
+
+case "$uname_s" in
+    Linux|FreeBSD)
+        ps -o comm= -p 1 || true
+        exit 0
+    ;;
+    *)
+        echo "init exlorer needs to be implemented for $os" >&2
+        exit 1
+    ;;
+esac