I was able to resolve this issue speaking with Jamf support. It turns out when a policy is ran it uses the root user.

There is a small difference between running policies with a policy versus with Jamf Remote. Policies run via policy are executed as the root user, whereas policies executed via Jamf Remote are executed as the management account with root privileges.

To avoid this, i explicitly changed the directory in the script before it begins the installation.  Taking this post install script from McAfee-Agent/postinstall.sh at master · franton/McAfee-Agent · GitHub , after line 42 i changed the directory  adding "cd /private/tmp". This resolved my issue 

Following your example, I've got a pkg mostly working.

The McAfeeSmartInstall.sh kicks off and launches the GUI McAfeeSmartInstall.app which bounces for several minutes. It finally stops bouncing, but the pkg/Installer.app never closes out.

How are you running the script? 

Here's how im executing the script in Jamf as a policy

#!/bin/bash

# Script to install latest McAfee version from install.sh script.
# Should also upgrade any previous software before proceeding.

# Author : contact@richard-purves.com
# Version : 1.0 - Initial Version

# Set up log file, folder and function
LOGFOLDER="/var/log/organisation"
LOG=$LOGFOLDER"/McAfee-Install.log"

if [ ! -d "$LOGFOLDER" ];
then
mkdir $LOGFOLDER
fi

echo $( date )" - Starting installation of McAfee Agent" > $LOG

logme()
{
# Check to see if function has been called correctly
if [ -z "$1" ]
then
echo $( date )" - logme function call error: no text passed to function! Please recheck code!"
exit 1
fi

# Log the passed details
echo "" >> $LOG
echo $( date )" - "$1 >> $LOG
echo "" >> $LOG
}

# Check for existing McAfee agent. Upgrade if present. Full install if not.

logme "Installing McAfee Agent."
cd /private/tmp
/private/tmp/McAfeeSmartInstall.sh 2>&1 | tee -a ${LOG}

# Now make the agent check for policies and other tasks

/bin/sleep 30

logme "Checking for new policies"
/Library/McAfee/agent/bin/cmdagent -c 2>&1 | tee -a ${LOG}

/bin/sleep 10

logme "Collecting and sending computer properties to ePO server"
/Library/McAfee/agent/bin/cmdagent -p 2>&1 | tee -a ${LOG}

/bin/sleep 10

logme "Forwarding events to ePO server"
/Library/McAfee/agent/bin/cmdagent -f 2>&1 | tee -a ${LOG}

/bin/sleep 10

logme "Enforcing ePO server policies"
/Library/McAfee/agent/bin/cmdagent -e 2>&1 | tee -a ${LOG}

# Delete script
rm -rf /private/tmp/McAfeeSmartInstall.sh

#Check-in to JAMF
/usr/local/jamf/bin/jamf recon

#Grab new profiles
/usr/local/jamf/bin/jamf manage

# All done!

logme "Installation script completed"

@eric_benfer 

In the past I had always just created a pkg and ran the "Install - McAfee Agent" script as a postinstall script all within the pkg.

This time around it does not seem to like that approach.

I was able to get it working by running the "Install - McAfee Agent" from a policy... Just like what you are doing.

Thanks.