Create a session to mount encrypted files and unmount on exit

access_crypt.py

# access_crypt.py
# Makes using encrypted storage easier.
# Mounts the storage, opens a shell, and unmounts when the shells closes (however ungracefully)

# Works under Ubuntu 14.04, following these instructions to set up your encrypted storage file:
# https://www.digitalocean.com/community/tutorials/how-to-use-dm-crypt-to-create-an-encrypted-volume-on-an-ubuntu-vps

from contextlib import contextmanager
from pysh import sh

FILE_LOCATION = "Your encrypted storage file's location on disk"
MOUNT_NAME = "The name you'd like to give your mounted storage system"

@contextmanager
def mount_volume():
    try:
        sh.cryptsetup("luksOpen", FILE_LOCATION, MOUNT_NAME)
        sh.mount("/dev/mapper/{}".format(MOUNT_NAME), "/mnt/{}".format(MOUNT_NAME))
        yield
    finally:
        sh.umount("/mnt/{}".format(MOUNT_NAME))
        sh.cryptsetup("luksClose", MOUNT_NAME)

def main():
    with mount_volume():
        sh.bash()

if __name__ == "__main__":
    main()