A script for managing an encrypted volume at ~/Secrets (Mac OS X)

secrets.sh

#!/usr/bin/env sh

program=$(basename $0)
command=$1

help() {
  echo "Usage: $program <subcommand>"
  echo ""
  echo "Subcommands:"
  echo "    create   Create an encrypted volume"
  echo "    mount    Mount the encrypted volume"
  echo "    unmount  Unmount the encrypted volume"
  echo ""
}

sub_mount() {
  hdiutil attach ~/Documents/Secrets.dmg -mountroot ~
}

sub_unmount() {
  hdiutil unmount ~/Secrets
}

sub_create() {
  mkdir ~/Secrets
  hdiutil create \
    -format UDRW \
    -encryption AES-256 -megabytes 100 \
    -srcfolder ~/Secrets ~/Documents/Secrets.dmg
  rmdir ~/Secrets
}

case $command in
  "" | "-h" | "--help")
    help
    ;;
  *)
    shift
    sub_${command} $@
    if [ $? = 127 ]; then
      echo "Error: '$command' is not a known command." >&2
      echo "       Run '$program --help' for a list of commands." >&2
      exit 1
    fi
    ;;
esac