gistfile1.txt

#!/bin/sh

# Script credit: Jeremy Reichman <jjracc@rit.edu>
# VolumeCheck Exit Statuses are calculated by subtracting 32
# E.G. exit 48 matches 16, exit 50 matches 18 in the VolumeCheck.strings file
# Check for minimum Mac OS X major version on the volume

SCRIPT_PATH="$0"
VOLUME_PATH="$1"

echo "\$0 = $0"
echo "\$1 = $1"

if [ ! -e "$VOLUME_PATH/System/Library/CoreServices/SystemVersion.plist" ];then
	echo "ERROR: This volume $VOLUME_PATH does not have OS X installed"
	exit 50
fi

# Get the version of Mac OS X on the target volume
VOLUME_VERSION=`/usr/bin/defaults read "$VOLUME_PATH/System/Library/CoreServices/SystemVersion" ProductVersion`
echo "Install volume has OS X $VOLUME_VERSION"
# Get the major version of Mac OS X from the full version string
# Corresponds to y in x.y.z
VOLUME_VERSION_MAJOR=`/bin/echo "$VOLUME_VERSION" | /usr/bin/cut -f 2 -d '.'`
VOLUME_VERSION_MINOR=`/bin/echo "$VOLUME_VERSION" | /usr/bin/cut -f 3 -d '.'`
echo "The install volume has the Major OS version: $VOLUME_VERSION_MAJOR"
echo "The install volume has the Minor OS version: $VOLUME_VERSION_MINOR"
# Set the minimum  Mac OS X major and minor version required on the volume
MINIMUM_VERSION_MAJOR="7"
MINIMUM_VERSION_MINOR="2"

if [ "$VOLUME_VERSION_MAJOR" -ge "$MINIMUM_VERSION_MAJOR" ] && [ "$VOLUME_VERSION_MINOR" -ge "$MINIMUM_VERSION_MINOR" ] ; then
	# Success
	echo "Success: OS X $VOLUME_VERSION can be used"
	exit 0
else
	# Corresponds to failure code "16" in VolumeCheck.strings
	echo "ERROR: OS X $VOLUME_VERSION can NOT be used. Exiting..."
	exit 48
fi

exit 0