installer

#!/bin/bash

#
# install script for EMU Audio kernel extension
# W.Pasman 10jul2016
#

#
# Ask user 
#
clear;echo;echo;echo "EMU USB Installer by W.Pasman"
cd "$(dirname "$0")"
pathname= pwd -P 


# os version returns something like 10.11.4. We need 2nd number.
IFS="."
read -ra values  <<< "$(sw_vers -productVersion)"
# 10.7 = OSX7 ... 10.14=OSX14 mojave , 10.15=osx15 catalina 11.1=OSX16=big sur 
let osversion="( ${values[0]} - 10 ) * 15 + ${values[1]}"
echo $osversion
# determine the driver version for this os
if [ "$osversion" -lt "7" ] ; then
	echo "WARNING: This driver may not work correctly on OSX 10.6 and before."
fi

# determine kext directory
if [ "$osversion" -lt "16" ] ; then
  kextdir="/System/Library/Extensions/"
else
  kextdir="/Library/Extensions/"
fi

#ensure device has been turned off
IFS=" "
read -ra ison  <<< "$(system_profiler SPUSBDataType | grep 'E-MU 0')";
if [ "$ison" == "E-MU" ] ; then
	read -p "please turn off your EMU USB device and press return" -n 1 ok
	echo; echo;
fi

# ask user if he wants low latency or normal driver
read -p "Use low latency setting (n/y)?: n" -n 1 lowlatency
echo; echo;

#
# Execute the installation
#
# determine the right version for this system
if [ "$osversion" -gt "10" ] ; then
	driverversion="v11"
else
	driverversion="v9"
fi


# make copy of the correct driver and adjust latency setting
cp -r "$driverversion/EMUUSBAudio.kext" .

if [ "$lowlatency" == "y" ] ; then
	# Adjusts the driver to use low latency.
	echo "Adjusting driver for low latency"
	cd "$pathname/EMUUSBAudio.kext/Contents/"
	cat Info.plist  | sed -e 's/<integer>4200<\/integer>/<integer>1000<\/integer>/' > Info1.plist
	mv Info1.plist Info.plist
	cd "$pathname"
fi

echo "(Re)placing EMU kernel extension. We need the admin password for this."; echo

# here the user will have to enter his password
sudo kextunload -q "$kextdir/EMUUSBAudio.kext"
sudo rm -r "$kextdir/EMUUSBAudio.kext"
# Install new kernel extension
cd "$pathname"
sudo cp -r EMUUSBAudio.kext "$kextdir"

# delete old midi plugin
sudo rm -rf /Library/Audio/MIDI\ Drivers/EMUMIDIDriver.plugin 
# Install new midi plugin
sudo mkdir -p /Library/Audio/MIDI\ Drivers/
sudo cp -R EMUMIDIDriver\ orig.plugin /Library/Audio/MIDI\ Drivers/EMUMIDIDriver.plugin

#do permissions stuff
cd /Library/Audio/MIDI\ Drivers/
sudo chgrp -R wheel EMUMIDIDriver.plugin
cd "$kextdir"
sudo chgrp -R wheel EMUUSBAudio.kext

#load new kext
sudo kextload -v 0 EMUUSBAudio.kext

echo "Waiting for the system to finish installation. Can take several minutes."
if [ "$osversion" -gt "11" ] ; then
  SCRIPT='/rebuilding/ { print "Rebuilding the kernel" } /KernelCache ID/ { print "Kernel built. Updating cache" } /Directory caches updated/ { exit } '
  # use kextcache directly as log system keeps changing messages
  sudo kextcache -v 1 -i / | awk "$SCRIPT"
else
  SCRIPT='/Rescanning kernel extensions/ { print "Rebuilding the kernel" } /locked; waiting for lock/ { print "Waiting for lock to replace the old kernel" } /Lock acquired; proceeding/ { print "Inserting the new kernel"} /no supported helper partitions|helper partitions appear up to date/ { exit } '
  # pre-sierra, use system.log file.
  tail -f /var/log/system.log | awk "$SCRIPT"
fi
echo "Driver is installed and ready for use!" 
echo "You can close this window."