simplify supervised vs. standalone mode detection; also fix the docs

releng/inc/releng_getopts.inc

@@ -9,34 +9,20 @@ CLEANUP=1
 SPECIFIC_HELP=0
 START_DIR_DONT_CHANGE=`pwd`
 GEN_DATA_DIR=releng_generated_data/${SELF}
-RELENG_STANDALONE=-1
-RELENG_PARENT=unknown_parent
 
 #############################################
 standalone_or_supervised() {
- which ps >/dev/null 2>&1
- ret="$?"
- case "$ret" in
-   0)
-     RELENG_PARENT=`ps -p $PPID -o comm=`
-     if test x"$RELENG_PARENT" = x"run_all_auto"
-     then
-       echo "${SELF}: Running in Supervised mode by ${RELENG_PARENT}"
-       RELENG_STANDALONE=0
-     else
-       echo "${SELF}: Running in Standalone mode"
-       RELENG_STANDALONE=1
-     fi
+ case "${RELENG_SCRIPT_RUN_BY_RUN_ALL_AUTO}" in
+  1)
+     echo "${SELF}: Running in Supervised mode"
   ;;
   *)
-     echo "${SELF}: Running in Unknown mode by ${RELENG_PARENT}"
+     echo "${SELF}: Running in Standalone mode"
   ;;
-esac
-
-
+ esac
 }
 
-# Unconditionally initialize the invocation mode - standalone or supervised
+# Unconditionally shout out the invocation mode - standalone or supervised
 standalone_or_supervised
 
 #############################################