#!/bin/sh
# statf() warning system intended for use with cron

#set -x

if ! grep -q /usr/bin/lckdo /proc/$PPID/cmdline; then
	exec /usr/bin/lckdo /run/fswarn $0 "$@";
fi

THRESHOLD=90
STATEFILE=/var/lib/fswarn/state

[ -s /etc/default/fswarn ] && . /etc/default/fswarn

trap 'rm ${STATETEMP}' EXIT
STATETEMP=$(mktemp fswarn.XXXXXXXX)

for i in $( grep -E ' ('$( for FSTYPE in $( grep -v ^nodev /proc/filesystems ); do echo -n "$FSTYPE|"; done; echo -n "ramfs|tmpfs" )') ' /proc/mounts | cut -f 2 -d ' ' | sort -u ); do
  BLOCKFREE=$( stat -f -c %a $i )
  BLOCKTOTAL=$( stat -f -c %b $i )
  BLOCKALLOC=$(( ${BLOCKTOTAL} - ${BLOCKFREE} ))
  BLOCKPERCENT=$(( 100 * ${BLOCKALLOC} / ${BLOCKTOTAL} ))
  BLOCKOLDPERCENT=$( grep "^${i} " ${STATEFILE} | cut -f 4 -d ' ' | grep . ) 2>/dev/null || BLOCKOLDPERCENT=0
  if [ ${BLOCKPERCENT} -gt ${BLOCKOLDPERCENT} ] && [ ${BLOCKPERCENT} -gt ${THRESHOLD} ] ; then
    echo "WARNING: $i is at %${BLOCKPERCENT} block utilization!" > /dev/stderr
  fi
  echo -n "$i ${BLOCKALLOC} ${BLOCKTOTAL} ${BLOCKPERCENT}"
  INODEFREE=$( stat -f -c %d $i )
  INODETOTAL=$( stat -f -c %c $i )
  if [ $INODETOTAL -gt 0 ]; then
    INODEALLOC=$(( ${INODETOTAL} - ${INODEFREE} ))
    INODEPERCENT=$(( 100 * ${INODEALLOC} / ${INODETOTAL} ))
    INODEOLDPERCENT=$( grep "^${i} " ${STATEFILE} | cut -f 7 -d ' ' | grep . ) 2>/dev/null || INODEOLDPERCENT=0
    if [ ${INODEPERCENT} -gt ${INODEOLDPERCENT} ] && [ ${INODEPERCENT} -gt ${THRESHOLD} ] ; then
      echo "WARNING: $i is at %${INODEPERCENT} inode utilization!" > /dev/stderr
    fi
    echo -n " ${INODEALLOC} ${INODETOTAL} ${INODEPERCENT}"
  fi
  echo
done > ${STATETEMP}
cp ${STATETEMP} ${STATEFILE}