diff --git a/gpgtool b/gpgtool
index 3ae825e..1e30589 100755
--- a/gpgtool
+++ b/gpgtool
@@ -1,18 +1,142 @@
-#!/bin/bash
+#!/usr/bin/env zsh
+_dependencies=("echo" "gpg" "ln" "ls" "mktemp" "mkdir" "mv" "rm" "udisksctl")
+_tempdir=/tmp/gpgtool.tempdir
 
-########################
-# mount <dev>
-# open <key>
-# extend <key>
-# close <key>
-# unmount
-########################
+# Sets up GPGtool. Creates temporary GNUPG home directory, mounts key device if 
+# given, checks for key directory.
+init () {
+  local dev
+  local mount
+  local opts
+  local keypath
 
-( [[ $# -eq 2 ]] || [[ $1 -eq create ]] || [[ $@ -eq "list" ]] || [[ $@ -eq "unmount" ]] ) || exit 2
+  # Check if already initialized:
+  if [[ -f "${_tempdir}" ]]; then
+    local dir="$(cat ${_tempdir})"
+    echo "GPGtool already initialized at ${dir}."
+    if [[ -f "${dir}/env" ]]; then
+      source "${dir}/env"
+      [[ ! -z "${dev}" ]] && echo -e "\tdevice: ${dev}"
+      [[ ! -z "${mountdev}" ]] && echo -e "\tmapped device: ${mountdev}"
+      [[ ! -z "${keypath}" ]] && echo -e "\tkey path: ${keypath}"
+    fi
+    exit 1
+  fi
 
-_dir=/run/media/daniel/keysafe
-_dev=/dev/disk/by-label/keysafe
-_pkdir=~/.gnupg/private-keys-v1.d
+  zparseopts -A opts -D -E -- d: p: -device: -path:
+  for opt in "${(@k)opts}"; do
+    case $opt in
+      -d|--device)
+        dev=$opts[$opt];
+        ;;
+      -p|--path)
+        keypath=$opts[$opt];
+        ;;
+    esac
+  done
+
+  # If no device given, check for ENV:
+  [[ -z "${dev}" ]] && dev=${GPGTOOLKEYDEV}
+
+  # If no path given, check for ENV:
+  [[ -z "${keypath}" ]] && keypath=${GPGTOOLKEYPATH}
+
+  # Unlock device:
+  if [[ ! -z "${dev}" ]] && udisksctl info -b ${dev} | grep -q org.freedesktop.UDisks2.Encrypted; then
+    echo "Unlocking device ${dev} …"
+    local mountdev=$(udisksctl unlock -b "${dev}")
+    [[ $? != 0 ]] && echo "Error unlocking device ${dev}." && exit 1
+
+    mountdev="$(echo $mountdev | awk '{ print $4 }')"
+    mountdev=${mountdev:0:-1}
+  fi
+
+  # Mount device:
+  [[ -z ${mountdev} ]] && mountdev=${dev}
+  if [[ ! -z ${mountdev} ]]; then
+    echo "Mounting device ${mountdev} …"
+    mountpath=$(udisksctl mount -b "${mountdev}")
+    [[ $? != 0 ]] && echo "Error mounting device ${mount}." && exit 1
+
+    mountpath="$(echo $mountpath | awk '{ print $4 }')"
+  fi
+
+  # Finalize path:
+  [[ ! -z "${mountpath}" ]] && keypath=${mountpath}/${keypath}
+
+  # Check if keypath actually exists:
+  [[ ! -d "${keypath}" ]] && echo "Key path ${keypath} is not a directory, aborting …" && exit 64
+
+  # Create temporary working directory:
+  local tempdir=$(mktemp -d --tmpdir)
+  mkdir ${tempdir}/gpghome
+
+  # Save state:
+  cat > ${tempdir}/env << EOF
+dev="${dev}"
+mountdev="${mountdev}"
+keypath="${keypath}"
+EOF
+  echo -n "${tempdir}" > /tmp/gpgtool.tempdir
+
+  echo "GPGtool initialized. Temporary working directory: ${tempdir}, key path ${keypath}."
+}
+
+# Cleans up GPGtool. Clears the temp directory and closes the mounted volume.
+clear () {
+  # Abort if not currently initialized:
+  [[ ! -f "${_tempdir}" ]] && echo "GPGtool not currently initialized, aborting …" && exit 1
+
+  local tempdir="$(cat /tmp/gpgtool.tempdir)"
+
+  # Unmount device:
+  source "${tempdir}/env"
+  if [[ ! -z "${mountdev}" ]]; then
+    echo "Unmounting ${mountdev} …"
+    udisksctl unmount -b "${mountdev}"
+  fi
+  # Lock device:
+  if [[ "${dev}" != "${mountdev}" ]]; then
+    echo "Locking ${dev} …"
+    udisksctl lock -b "${dev}"
+  fi
+
+  # Remove temporary working directory:
+  echo "Removing temporary working directory ${tempdir} …"
+  rm -rf "${tempdir}"
+  rm -f "${_tempdir}"
+}
+
+# Prints usage information.
+usage () {
+  echo FIXXME
+}
+
+# Abort for missing dependencies:
+for dep in ${_dependencies}; do
+  if ! command -v ${dep} >/dev/null 2>&1; then
+    [[ -z "${deps}" ]] && deps=${dep} || deps="${deps}, ${dep}"
+  fi
+done
+[[ ! -z "${deps}" ]] && echo "Missing dependencies: ${deps}." && exit 1
+
+# Abort for no arguments:
+[[ $# == 0 ]] && usage && exit 64
+
+# Handle -h / --help / help and exit:
+[[ "$1" =~ "(-h|--help|help)" ]] && usage && exit 0
+
+# Source config file:
+for dir in "$(dirname $0)" "${HOME}/.config/gpgtool" "${XDG_CONFIG_HOME}"; do
+  [[ -f "${dir}/gpgtool.conf" ]] && source "${dir}/gpgtool.conf"
+done
+
+# Handle Subcommands:
+[[ "$(type -w $1)" =~ "(.+\s+)?function" ]] \
+  && $@ \
+  || echo "Invalid command: $1. See \`$0 --help\`." >&2 && exit 64
+
+#==================================================
 
 # gpgtools mount device
 mount () {
@@ -25,7 +149,7 @@ unmount () {
   dev=${1}
   udisksctl unmount -b ${_dev}
   udisksctl lock -b ${dev}
-  sync ${dev}
+  sudo sync ${dev}
 }
 
 # gpgtools open keyid [keyid …]
@@ -121,5 +245,3 @@ list () {
     ls -l ${_pkdir} | grep ^l | awk {'print $NF'}
   fi
 }
-
-$@