A script to kill Passenger processes that are not known anymore by the watchdog

kill_passenger_orphans.sh

#!/bin/bash

set -e

# overridable defaults
GEM_HOME=${GEM_HOME:-/usr/local/passenger}
PASSENGER_BIN_PATH=${PASSENGER_BIN_PATH:-$GEM_HOME/bin}
PASSENGER_TMPDIR=${PASSENGER_TMPDIR:-/var/tmp}
PATH=$PATH:$PASSENGER_BIN_PATH

MEMORY_STATS_BIN=`which passenger-memory-stats`
STATUS_BIN=`which passenger-status`

attached_pids() {
  GEM_HOME=$GEM_HOME \
  PASSENGER_TMPDIR=$PASSENGER_TMPDIR \
  $STATUS_BIN |
  grep '* PID' |
  cut -d ' ' -f 5
}

all_pids() {
  GEM_HOME=$GEM_HOME \
  PASSENGER_TMPDIR=$PASSENGER_TMPDIR \
  $MEMORY_STATS_BIN |
  grep -E '(Rack|Rails)' |
  cut -d ' ' -f 1
}

detached_pids() {
  # "combine" comes from the "moreutils" package (at least on Debian) 
  combine <(all_pids) not <(attached_pids)
}

detached_pids_as_string() {
  echo `detached_pids`
}

number_of_detached_pids() {
  detached_pids | wc -l
}

main() {
  if test -z detached_pids_as_string; then
    echo "Detached pids found : $(detached_pids_as_string)"
    kill `detached_pids_as_string`
  else
    echo "No detached pids found"
  fi
}

main

Apparently I'm the worst at writing bash scripts. This thing is not working properly, yet. Sorry for the mess.