Bash script to batch erase tapes

erase-tapes.sh

#!/bin/bash
set -euo pipefail

# Redirect everything to stdout and logfile
exec > >(tee -a erase_tape.log) 2>&1

# {{ ansible_managed }}
TAPE="{{ tape_backup__tape_drive }}"

if [[ ! -c "${TAPE}" ]]; then
  echo "Tape device '${TAPE}' not found"
  exit 1
fi

while true; do

echo "$(date +'%Y-%m-%d %H:%M:%S'): Wait for tape medium"
while true; do
  TAPE_STATUS=$(mt-st -f "${TAPE}" status | sed -nE 's/General status bits on \(([0-9]+)\):/0x\1/p')
  if (( (TAPE_STATUS & 0x01000000) != 0 )); then
    # GMT_ONLINE
    break;
  fi
  sleep 1
done

echo ""

echo "$(date +'%Y-%m-%d %H:%M:%S'): Rewind tape"
mt-st -f "${TAPE}" rewind

echo ""

# Print status
mt-st -f "${TAPE}" status

echo ""

echo "$(date +'%Y-%m-%d %H:%M:%S'): Erase tape"
mt-st -f "${TAPE}" erase

echo ""

echo "$(date +'%Y-%m-%d %H:%M:%S'): Eject tape"
mt-st -f "${TAPE}" eject

done