Check a list of mount points and send an email if the mount is not active

check_mounts.sh

#!/usr/bin/env bash

set -Ee                               # fail script, if single command fails
set -u                                # unset variables are treated as errors
set -f                                # no filename extension
set -o pipefail                       # if a subcommand from a pipe fails, the whole pipe fails
trap cleanup SIGINT SIGTERM ERR EXIT  # execute cleanup function at following signals

SOURCE_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)  # location of script

cleanup() {
    trap - SIGINT SIGTERM ERR EXIT
    # script cleanup here
}

SENDER="Administration [$(hostname)]"
DESTINATION="<E-MAIL-ADRESS>"
CHECKPOINTS=(
   "/mnt/directory1" 
   "/mnt/directory2"
)

for mount_check in "${CHECKPOINTS[@]}"
do 
    if ! mountpoint -q "${mount_check}"
    then
        sendmail "-F ${SENDER}" "${DESTINATION}" <<< "${mount_check} failed"
    fi
done