check_tmux

#!/bin/bash
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#  
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#  
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
#  MA 02110-1301, USA.
# ------------------------------------------------------------------
# [(c) Fede Diaz] [nordri@gmail.com] check_tmux
#          Check the longest TMUX process on the system.
#          0.1
#          November 12 2013
#          
#          $ ./check_tmux -w DAYS -c DAYS
#
#
#     
# ------------------------------------------------------------------

export LANG=C

PROC="[t]mux";
TMUX_PROCS=$(ps -eo comm,pid | grep -w $PROC | awk '{ print $2 }' );
TODAY=$(date -d "now" +%s);
HOUR_REGEXP="^[0-9]{1,2}\:[0-9]{1,2}\:[0-9]{1,2}";
PROGNAME=$(basename $0);

MAX_TIME_RUNNING=0;

# Functions
usage () {
  echo "Usage: $PROGNAME -w Warning -c Critical"
}

# Parse command line
if [ "$#" -lt 4 ]; then
  usage;
  exit 3;
fi

# Options processing
until [ -z "$1" ]  
do
  if [ $1 == "-w" ]; then
    let VALUE=$2;
    let WARNING=$VALUE;
  elif [ $1 == "-c" ]; then
    let VALUE=$2;
    let CRITICAL=$VALUE;
  fi
  shift;
done

# if no open TMUX exit
if [ -z "$TMUX_PROCS" ]; then
  echo "OK: There is no open TMUX sessions";
  exit 0;
fi

# Body
for i in $TMUX_PROCS;
do
  START_DATE=$(ps -p ${i} -o start= );
  if [[ ! $START_DATE =~ $HOUR_REGEXP ]]; then
    let START_DATE_SEC=$(date -d "$START_DATE" +%s);
    let DAYS_RUNNING=$(echo $(( ($TODAY - $START_DATE_SEC) / 86400)));

    if [[ "$DAYS_RUNNING" -gt "$MAX_TIME_RUNNING" ]]; then
      let MAX_TIME_RUNNING=$DAYS_RUNNING;
    fi
  fi
done

# Results
if [[ $MAX_TIME_RUNNING -lt $WARNING ]]; then
  echo "OK: There is no open TMUX session";
  exit 0;
elif [[ "$MAX_TIME_RUNNING" -ge "$WARNING" ]] && [[ "$MAX_TIME_RUNNING" -lt "$CRITICAL" ]]; then
  echo "WARNING: There is an open TMUX session for $WARNING days";
  exit 1;
elif [[ "$MAX_TIME_RUNNING" -ge "$CRITICAL" ]]; then
  echo "CRITICAL: There is an open TMUX session for $MAX_TIME_RUNNING days";
  exit 2;
else
  echo "UNKNOWN";
  exit 3;
fi