Bash signal handler

gistfile1.sh

# Traps for cleaning up on exit
# Originally from http://www.linuxjournal.com/content/use-bash-trap-statement-cleanup-temporary-files
declare -a on_sig_items

function on_exit()
{
    echo "Received SIGEXIT, Cleaning up: $i"
    for i in "${on_sig_items[@]}"; do
        echo "Executing cleanup statement: $i"
        eval $i
    done
}

function on_break()
{
    color_echo red "Signal receied, unexpected exit"
    for i in "${on_sig_items[@]}"; do
        echo "Executing cleanup statement: $i"
        eval $i
    done
}

function add_on_sig()
{
    local n=${#on_sig_items[*]}
    on_sig_items[$n]="$*"
    if [[ $n -eq 0 ]]; then
        echo "Setting up signal trap"
        trap on_exit EXIT
        trap on_break INT QUIT TERM
    fi
}

# Exit on failure function
function exit_on_fail {
        echo "Last command did not execute successfully but is required!" >&2
        echo "Exiting and rolling back all changes!" >&2
exit 1
}

# USAGE EXAMPLE
tmp_dir="$(mktemp -d"
chmod -R 700 ${tmp_dir} && add_on_sig "rm -Rf ${tmp_dir}"