Support for PREBUILT_ILLUMOS, and optional /tmp/debug.$$ output.

*** 1135,1141 ****
--- 1135,1168 ----
      local ORIG_FUNC=$(declare -f $1)
      local NEWNAME_FUNC="$2${ORIG_FUNC#$1}"
      eval "$NEWNAME_FUNC"
  }
  
+ # Called by builds that need a PREBUILT_ILLUMOS actually finished.
+ wait_for_prebuilt() {
+     if [ ! -d ${PREBUILT_ILLUMOS:-/dev/null} ]; then
+         echo "wait_for_prebuilt() called w/o PREBUILT_ILLUMOS. Bailing."
+         clean_up
+         exit 1
+     fi
+ 
+     # -h means symbolic link. That's what nightly does.
+     if [ ! -h $PREBUILT_ILLUMOS/log/nightly.lock ]; then
+         return
+     fi
+ 
+     nightly_pid=`ls -lt $PREBUILT_ILLUMOS/log/nightly.lock | awk -F. '{print $4}'`
+     # Wait for nightly to be finished if it's running.
+     logmsg "Waiting for illumos nightly build $nightly_pid to be finished."
+     pwait $nightly_pid
+     if [ -h $PREBUILT_ILLUMOS/log/nightly.lock ]; then
+         logmsg "Nightly lock present, but build not running.  Bailing."
+         if [[ -z $BATCH ]]; then
+             ask_to_continue
+         fi
+         clean_up
+         exit 1
+     fi
+ }
+ 
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