support lowercase values in bastille.conf (issue #368)

usr/local/share/bastille/common.sh

@@ -117,3 +117,24 @@ EOF
 EOF
     fi
 }
+
+checkyesno() {
+    ## copied from /etc/rc.subr -- cedwards (20231125)
+    ## issue #368 (lowercase values should be parsed)
+    ## now used for all bastille_zfs_enable=YES|NO tests
+    ## example: if checkyesno bastille_zfs_enable; then ...
+    ## returns 0 for enabled; returns 1 for disabled
+    eval _value=\$${1}
+    case $_value in
+    [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
+        return 0
+        ;;
+    [Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|[Oo][Ff][Ff]|0)
+        return 1
+        ;;
+    *)
+        warn "\$${1} is not set properly - see rc.conf(5)."
+        return 1
+        ;;
+    esac
+}