coldbackup initial, not working yet

coldbackup/Makefile

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+default: dobackup
+
+dobackup:
+	./dobackup.sh

coldbackup/README.md

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+# coldbackup
+
+Vagrantfile and script to backup a home directory to a standard linux 
+luks image on an unencrypted disk.  Created because duplicity is somewhat of
+a pain and I don't trust Time Machine that much and OSX encrypted image
+files (sparse and normal both) are proprietary.

coldbackup/Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
+VAGRANTFILE_API_VERSION = "2"
+
+SETUP_BASE = <<-EOF
+
+set -e
+set -x
+set -v
+
+echo "UseDNS no" >> /etc/ssh/sshd_config
+service ssh restart
+
+apt-get update
+apt-get -y install kpartx debootstrap lvm2 qemu-utils cryptsetup
+
+export CRYPTPASSPHRASE="#{ENV["BACKUP_ENCRYPTION_KEY"]}"
+
+DF="/destdir/backupimage.dat"
+if [ ! -r "$DF" ] ;then
+    # internal laptop disk size, adjust to taste
+    # here's wishing exfat supported sparse files...
+    dd if=/dev/zero of=$DF bs=1 count=0 seek=750G
+    losetup /dev/loop0 $DF
+    echo "$CRYPTPASSPHRASE" | cryptsetup luksFormat /dev/loop0 -
+    echo "$CRYPTPASSPHRASE" | cryptsetup luksOpen /dev/loop0 backup-plain
+    pvcreate /dev/mapper/backup-plain
+    vgcreate backupvg0 /dev/mapper/backup-plain
+    lvcreate -n backup -l 100%FREE backupvg0
+    mkfs.ext4 /dev/backupvg0/backup
+else
+    losetup /dev/loop0 $DF
+    echo "$CRYPTPASSPHRASE" | cryptsetup luksOpen /dev/loop0 backup-plain
+    pvscan && vgscan && lvscan
+fi
+mkdir /mnt/backup
+mount /dev/backupvg0/backup /mnt/backup
+
+EOF
+
+Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
+  config.vm.box = "ubuntu-12.04"
+  config.vm.box_url = "http://cloud-images.ubuntu.com/vagrant/precise/" + \
+    "current/precise-server-cloudimg-amd64-vagrant-disk1.box"
+  config.vm.synced_folder ENV["HOME"], "/sourcedir"
+  config.vm.synced_folder ENV["DESTDIR"], "/destdir"
+  config.vm.provision "shell", inline: SETUP_BASE
+  config.vm.provider :virtualbox do |vb|
+    vb.customize ["modifyvm", :id, "--memory", "2048"]
+  end
+end

coldbackup/dobackup.sh

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+#!/bin/bash
+
+set -e
+
+export DESTDIR="/Volumes/coldbackup"
+
+if [ ! -d "$DESTDIR" ]; then
+    echo "dest disk $DESTDIR not present" > /dev/stderr
+    exit 127
+fi
+
+vagrant destroy -f || true # FIXME this may cause disk corruption
+
+PASSPHRASEFILE="${HOME}/Documents/Secure/backup-password.txt"
+export BACKUP_ENCRYPTION_KEY="$(cat "$PASSPHRASEFILE")"
+vagrant up