mount a network share before doing a specified action and umount it afterwards (see also backup and archive)

withbackupdevice

#!/bin/bash

#set -x

function failure() {
  echo "backup failed " `date` >> /var/log/backup-mount-`date +%Y-%m-%d`
  exit
}

function kill_childs() {
  CPIDS=`pgrep -P $$`
  echo "childs running: $CPIDS"
  if [ -n "$CPIDS" ]; then
    echo "terminating childs"
    kill -s TERM ${CPIDS} &> /dev/null
    wait ${CPIDS}
  fi
}

function exit_trap() {
  kill_childs
  echo "unounting share"
  cd /
  sync
  sleep 1
  umount /backup
}

function prepare() {
  echo "preparing backup share"
  if (mount | grep '/backup'); then
    echo "warn: umounting backup share"
    umount /backup
  fi
}

function mount_share() {
  echo "mounting backup share"
  echo "SECRET" | sshfs USER@DUPLICITYHOST:USER /backup -o idmap=user,password_stdin || failure
  trap exit_trap EXIT
}

prepare
mount_share

echo "starting action"
$*