Kill processes holding locks on a given file path by progressively issuing higher severity signals for each PID.

kill-locks.sh

#!/bin/bash
# shellcheck disable=SC2086

#
# DESCRIPTION:
#   'safely' kill processes holding file locks for a file path
#   useful for managing mountpoints with user session state changes
#
# USAGE:
#   $0 <file-path>
#

acquireLocks() {
  local -a _LOCKS
  mapfile -t _LOCKS < <(
    lsof -Fp $1 2>/dev/null |
      sed 's/^p//g'
  )

  if [ ${#_LOCKS[@]} -gt 0 ]; then
    echo "${_LOCKS[@]}"
    return
  else
    return 1
  fi
}

# Iterate through locking PIDs, sending
#   progressively higher severity signals
SIGNALS=(15 1 3 6 9)
for s in "${SIGNALS[@]}"; do
  mapfile -t LOCKS < <(acquireLocks $1)
  for f in "${LOCKS[@]}"; do
    kill -$s $f
  done

  # Wait ~5s only when locks remain
  sleep 0.25
  mapfile -t LOCKS < <(acquireLocks $1)
  test ${#LOCKS[@]} -gt 0 && \
    sleep 4.75
done

echo "${_LOCKS[@]}"