Automatically mount and unmount network shares with connection to company network

handle-shares

#! /usr/bin/env bash

# Put this in /etc/NetworkManager/dispatcher.d/
# to mount and unmount smb/cifs shares with the connection to the network

if test "${IP4_DOMAINS}" = "${COMPANY_DOMAIN}"; then
  if "${2}" = "up" -o "${2}" = "vpn-up"; then
    # mount the common directory as read only to avoid mistakes
    mount /mnt/sharedserver
    mount /mnt/home
  fi
elif test "${2}" = "down" -o "${2}" = "vpn-down"; then
  umount -l -a -t cifs # lazily unmount all cifs filesystems
fi

mountpoints

# This is the /etc/fstab file

# ...
# lots other entries
# ...
//SHAREADDRESS/common/directory/path /mnt/sharedserver cifs noauto,ro,uid=1000,gid=100,credentials=/home/username/.sharedserver.creds 0 0
//SHAREADDRESS/users/my-directory /mnt/home cifs noauto,credentials=/home/username/.sharedserver.creds 0 0

sharedserver.creds

domain=DOMAIN
username=USERNAME
password=PASSWORD

Rather than passing the username and password directly in the script, it's better to make a file (in a location that can only be edited or read by the user who should have access to the server), in the format of sharedserver.creds, and pass that as the credentials option to the mount command.

The even better way is to add the mount points to /etc/fstab and then you can just mount the mount point without specifying anything further. And it makes it easier to remount (for example to add write permissions) later on.