#!/bin/bash
# watch_and_nice - Watches for the specified process name, and renices it
#    to the desired value when seen.

if [ $# -ne 2 ] ; then
  echo "Usage: $(basename $0) desirednice jobname" >&2
  exit 1
fi

pid="$(renicename -p "$2")"

if [ "$pid" == "" ] ; then
  echo "No process found for $2"
  exit 1
fi

if [ ! -z "$(echo $pid | sed 's/[0-9]*//g')" ] ; then
  echo "Failed to make a unique match in the process table for $2" >&2
  exit 1
fi

currentnice="$(ps -lp $pid | tail -1 | awk '{print $6}')"

if [ $1 -gt $currentnice ] ; then
  echo "Adjusting priority of $2 to $1"
  renice $1 $pid
fi

exit 0