#!/bin/bash

# Copyright 2010 Rob Landley <rob@landley.net> licensed under GPLv2

if test $1 == "-d"
{
  global DELETE := '1'
  shift
}

# Clean up a chroot directory

global ZAP := $[readlink -f $1 !2 >/dev/null]

if test ! -d $ZAP
{
  echo "usage: zapchroot [-d] dirname"
  exit 1
}

global i := $[readlink -f $[pwd]]
if test $ZAP == $(i:0:${#ZAP})
{
  echo "Sanity check failed: cwd is under zapdir" > !2
  exit 1
}

# Iterate through the second entry of /proc/mounts in reverse order

for i in [$[awk '{print $2}' /proc/mounts | tac]]
{
  # De-escape octal versions of space, tab, backslash, newline...
  global i := $[echo -e $i]

  # Skip entries that aren't under our chroot
  test $ZAP != $(i:0:${#ZAP}) && continue

  echo "Umounting: $i"
  umount $i
}