From 7c1dacb6659cf0eff6ff683555c837cc45032561 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Mon, 3 Jul 2017 22:22:18 +0200
Subject: Initial commit

---
 mount | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100755 mount

diff --git a/mount b/mount
new file mode 100755
index 0000000..3d8884a
--- /dev/null
+++ b/mount
@@ -0,0 +1,67 @@
+#!/bin/bash
+
+set -e
+
+base_dir="$(readlink -f "${0%/*}")"
+
+if ! mountpoint -q "${base_dir}"; then
+  echo 'Komisch, das Skript liegt nicht, wo es sein sollte.'
+  exit 1
+fi
+
+if ! [ -d "${base_dir%1}2" ]; then
+  echo 'Neben dem Verzeichnis des Skriptes sollte es noch ein zweites geben.'
+  exit
+fi
+
+if mountpoint -q "${base_dir%1}2"; then
+  mount=false
+else
+  mount=true
+fi
+
+device="$(
+  mount | \
+    grep "^\S\+1 on ${base_dir} " | \
+    awk '{print $1}' | \
+    sed 's|1$||'
+)"
+
+if ! [ -b "${device}" ] || \
+  ! [ -b "${device}1" ] || \
+  ! [ -b "${device}2" ]; then
+  echo 'Komisch, das Skript befindet sich nicht auf der Partition, wo es sein sollte.'
+  exit 1
+fi
+
+crypt_device="usb-disk-$(
+  sha512sum "$0" | \
+    head -c16
+)"
+
+tmp_dir="$(mktemp -d)"
+trap 'rm -rf --one-file-system "${tmp_dir}"' EXIT
+
+if ${mount}; then
+
+  mkfifo "${tmp_dir}/fifo"
+
+  gpg -o - -d "/mnt/usb/usbhd-sdg1/key_$(whoami).gpg" > \
+    /dev/null
+
+  gpg -o - -d "/mnt/usb/usbhd-sdg1/key_$(whoami).gpg" > \
+    "${tmp_dir}/fifo" &
+
+  su -c '
+    cryptsetup luksOpen "'"${device}2"'" "'"${crypt_device}"'" --key-file "'"${tmp_dir}/fifo"'"
+    mount "/dev/mapper/'"${crypt_device}"'" "'"${base_dir%1}2"'"
+  '
+
+else
+
+  su -c '
+    umount -l "'"${base_dir%1}2"'"
+    cryptsetup luksClose "'"${crypt_device}"'"
+  '
+
+fi
-- 
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