#!/bin/sh
#
# Copyright (C) 2006 Google. All Rights Reserved.
#
# See http://developer.apple.com/documentation/DeveloperTools/Conceptual/SoftwareDistribution4/Concepts/sd_volume_check_ref.html

VOLUME=$1

VERSION_PATH="/System/Library/CoreServices/SystemVersion"

if [ ! -f "${VOLUME}/${VERSION_PATH}.plist" ]
then
  # Volume doesn't appear to have OS X installed.
  exit 112
fi

VERSION=`/usr/bin/defaults read "$VOLUME/$VERSION_PATH" ProductVersion`
if [ x"$VERSION" = x"" ]
then
  # Unable to get OS X version from volume.
  exit 113
fi

MAJOR=`echo "$VERSION" | /usr/bin/awk -F. '{ print $1 }'`
MINOR=`echo "$VERSION" | /usr/bin/awk -F. '{ print $2 }'`
if [ \( x"$MAJOR" = x"" \) -o \( x"$MINOR" = x"" \) ]
then
  # Unable to parse OS X version obtained from volume.
  exit 114
fi

if [ \( $MAJOR -lt 10 \) -o \( $MINOR -lt 4 \) ]
then
  # Requires Mac OS X 10.4 or greater.
  exit 115
fi

# Success!
exit 0