Script to run LaunchAgent as the logged-in user from a script run with root privileges

run_launchagent_as_user.sh

#!/bin/bash

LAUNCH_AGENT_PATH="/Library/LaunchAgents/com.pritunl.client.plist"

currentUser=$(python -c 'from SystemConfiguration import SCDynamicStoreCopyConsoleUser; import sys; username = (SCDynamicStoreCopyConsoleUser(None, None, None) or [None])[0]; username = [username,""][username in [u"loginwindow", None, u""]]; sys.stdout.write(username + "\n");')
currentUserPID=$(pgrep WindowServer -m1)
currentUserUID=$(id -u "$currentUser")
osvers=$(sw_vers -productVersion | awk -F. '{print $2}')

if [[ $EUID -ne 0 ]]; then
    printf "Run this script as root."
    exit 10
fi

if [ ! -f "$LAUNCH_AGENT_PATH" ]; then
    printf "Launch agent not found at path: %s" "$LAUNCH_AGENT_PATH"
    exit 20
fi

if [[ $osvers -lt 10 ]]; then
    launchctl bsexec "$currentUserPID" launchctl load "$LAUNCH_AGENT_PATH" > /dev/null 2>&1 &
elif [[ $osvers -eq 10 ]]; then
    launchctl asuser "$currentUser" launchctl load "$LAUNCH_AGENT_PATH" > /dev/null 2>&1 &
elif [[ $osvers -ge 11 ]]; then
    launchctl bootstrap "gui/$currentUserUID" "$LAUNCH_AGENT_PATH" > /dev/null 2>&1 &
else
    printf "Things have gone terribly wrong. OS Version: %s" "$osvers"
    exit 30
fi