#!/bin/bash

# this is still broken it seems!  much better to plain 'exit on failure' with a 'wrapper script' solution

FAIL_MAIL=sam
LOG=/tmp/process_`date +%Y%m%d-%H%M%S`.log

handle_failure() {
    mail -s "process failed" $FAIL_MAIL < $LOG &&
        echo >&2 sent mail to $FAIL_MAIL
	trap '-' EXIT
    exit 1
}

handle_error() {
    echo >&2 exit due to error
    handle_failure
}

process() {
    # do some stuff
    sleep 5 && echo 5 seconds &
    file_count=`ls $HOME | wc -l`
    [ $(($RANDOM % 2)) = 0 ]
    echo "You have $file_count files in $HOME"
    wait
} 

TERM_subprocs() {
    echo
	trap '' TERM
	kill -TERM -$$
}

handle_exit() {
	TERM_subprocs
	exit 0
}

handle_signal() {
    echo >&2 exit due to signal
	TERM_subprocs
    handle_failure
}

#set -E -e -u -o pipefail

trap handle_signal 1 4 5 6 7 8 9 10 11 12 13 14 15 16 24 25 26 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64  # system-dependent
#trap handle_exit EXIT

process 2>&1 | tee $LOG
if [ $? -ne 0 ]; then
    handle_error
fi