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diff --git a/scripts/runtest.sh b/scripts/runtest.sh
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+# Simple test harness infrastructure
+#
+# Copyright 2005 by Rob Landley
+
+# This file defines two functions, "testing" and "optionflag"
+
+# The following environment variables enable optional behavior in "testing":
+#    DEBUG - Show every command run by test script.
+#    VERBOSE - Print the diff -u of each failed test case.
+#              If equal to "fail", stop after first failed test.
+#    SKIP - do not perform this test (this is set by "optionflag")
+#
+# The "testing" function takes five arguments:
+#	$1) Description to display when running command
+#	$2) Command line arguments to command
+#	$3) Expected result (on stdout)
+#	$4) Data written to file "input"
+#	$5) Data written to stdin
+#
+# The exit value of testing is the exit value of the command it ran.
+#
+# The environment variable "FAILCOUNT" contains a cumulative total of the
+# number of failed tests.
+
+# The "optional" function is used to skip certain tests, ala:
+#   optionflag CFG_THINGY
+#
+# The "optional" function checks the environment variable "OPTIONFLAGS",
+# which is either empty (in which case it always clears SKIP) or
+# else contains a colon-separated list of features (in which case the function
+# clears SKIP if the flag was found, or sets it to 1 if the flag was not found).
+
+export FAILCOUNT=0
+export SKIP=
+
+# Helper functions
+
+# Check config to see if option is enabled, set SKIP if not.
+
+optional()
+{
+  option=`echo "$OPTIONFLAGS" | egrep "(^|:)$1(:|\$)"`
+  # Not set?
+  if [ -z "$1" ] || [ -z "$OPTIONFLAGS" ] || [ ${#option} -ne 0 ]
+  then
+    SKIP=""
+    return
+  fi
+  SKIP=1
+}
+
+# The testing function
+
+testing()
+{
+  NAME="$1"
+  [ -z "$1" ] && NAME=$2
+
+  if [ $# -ne 5 ]
+  then
+    echo "Test $NAME has the wrong number of arguments ($# $*)" >&2
+    exit
+  fi
+
+  [ -n "$DEBUG" ] && set -x
+
+  if [ -n "$SKIP" ]
+  then
+    [ ! -z "$VERBOSE" ] && echo "SKIPPED: $NAME"
+    return 0
+  fi
+
+  echo -ne "$3" > expected
+  echo -ne "$4" > input
+  echo -ne "$5" | eval "$2" > actual
+  RETVAL=$?
+
+  cmp expected actual > /dev/null 2>&1
+  if [ $? -ne 0 ]
+  then
+    FAILCOUNT=$[$FAILCOUNT+1]
+    echo "FAIL: $NAME"
+    if [ -n "$VERBOSE" ]
+    then
+      echo "echo '$5' | $2"
+      diff -u expected actual
+      [ "$VERBOSE" == fail ] && exit 1
+    fi
+  else
+    echo "PASS: $NAME"
+  fi
+  rm -f input expected actual
+
+  [ -n "$DEBUG" ] && set +x
+
+  return $RETVAL
+}
+
+# Recursively grab an executable and all the libraries needed to run it.
+# Source paths beginning with / will be copied into destpath, otherwise
+# the file is assumed to already be there and only its library dependencies
+# are copied.
+
+mkchroot()
+{
+  [ $# -lt 2 ] && return
+
+  echo -n .
+
+  dest=$1
+  shift
+  for i in "$@"
+  do
+    [ "${i:0:1}" == "/" ] || i=$(which $i)
+    [ -f "$dest/$i" ] && continue
+    if [ -e "$i" ]
+    then
+      d=`echo "$i" | grep -o '.*/'` &&
+      mkdir -p "$dest/$d" &&
+      cat "$i" > "$dest/$i" &&
+      chmod +x "$dest/$i"
+    else
+      echo "Not found: $i"
+    fi
+    mkchroot "$dest" $(ldd "$i" | egrep -o '/.* ')
+  done
+}
+
+# Set up a chroot environment and run commands within it.
+# Needed commands listed on command line
+# Script fed to stdin.
+
+dochroot()
+{
+  mkdir tmpdir4chroot
+  mount -t ramfs tmpdir4chroot tmpdir4chroot
+  mkdir -p tmpdir4chroot/{etc,sys,proc,tmp,dev}
+  cp -L testing.sh tmpdir4chroot
+
+  # Copy utilities from command line arguments
+
+  echo -n "Setup chroot"
+  mkchroot tmpdir4chroot $*
+  echo
+
+  mknod tmpdir4chroot/dev/tty c 5 0
+  mknod tmpdir4chroot/dev/null c 1 3
+  mknod tmpdir4chroot/dev/zero c 1 5
+
+  # Copy script from stdin
+
+  cat > tmpdir4chroot/test.sh
+  chmod +x tmpdir4chroot/test.sh
+  chroot tmpdir4chroot /test.sh
+  umount -l tmpdir4chroot
+  rmdir tmpdir4chroot
+}
+