The info you're looking for can be obtained with the JSS API.
You'd need a script, possibly run from a once per computer policy that would use the API to grab the already assigned user data from the JSS' computer record and then use those as variables with the "jamf setARDFields" command.

Here's a quick example of getting the data from the API.

#!/bin/sh



## API user info and JSS URL. Adjust as needed

apiuser="apiuser"

apipass="apipass"

jssurl="https://jss-server.address:8443"



## Get the computer's serial number (for locating the record in the API)

Serial_Num=$(ioreg -rd1 -c IOPlatformExpertDevice | awk -F'"' '/IOPlatformSerialNumber/{print $4}')



## Generate variable containing "location" information on the computer record

Comp_Location_Data=$(curl -H "Accept: text/xml" -sfku "${apiuser}:${apipass}" "${jssurl}/JSSResource/computers/serialnumber/${Serial_Num}/subset/location" | xmllint --format - 2>/dev/null)



## Extract items from the above variable

Full_Name=$(echo "$Comp_Location_Data" | awk -F'>|<' '/<real_name/{print $3}')

User_Name=$(echo "$Comp_Location_Data" | awk -F'>|<' '/<username/{print $3}')

Department=$(echo "$Comp_Location_Data" | awk -F'>|<' '/<department/{print $3}')

Building=$(echo "$Comp_Location_Data" | awk -F'>|<' '/<building/{print $3}')



## Print back what was found

echo "Full Name:   $Full_Name

Username:   $User_Name

Department: $Department

Building:   $Building"

You can then use the above variables, like $Full_Name, $User_Name, etc. in a jamf setARDFields command on the Mac, which will set those local attributes on the Mac itself.

Hope that helps. Let me know if you have any other questions.

PERFECT!
Thank you!

Just because I wanted to do this using Python for practice:

#!/usr/bin/env python



import urllib

import xml.etree.ElementTree as ET

import subprocess



jssAPIuser = 'apiuser'

jssAPIpass = 'apipass'

jssURL = 'https://' + jssAPIuser + ':' + jssAPIpass + 

    '@jss.server.com:8443'



serial = subprocess.Popen("system_profiler SPHardwareDataType |grep -v tray 

    | awk '/Serial/ {print $4}'", shell=True, stdout=subprocess.PIPE).

    communicate()[0].strip()



url = jssURL + 

    '/JSSResource/computers/serialnumber/' + serial

uh = urllib.urlopen(url)

data = uh.read()

tree = ET.fromstring(data)

location = tree.findall('location')

full_name = location[0].find('real_name').text

user_name = location[0].find('username').text

building = location[0].find('building').text



updateARD = subprocess.check_output(['/usr/local/bin/jamf', 'setARDFields', '-1', full_name, '-2', user_name, '-3', building])

Updated the script to work with older versions of the JSS that do not have the jamf binary in /usr/local/bin:

#!/usr/bin/env python



# Name: updateARDinfo.py

# Date: 23 February 2016

# Purpose: used to pull location data out of the JSS and use it to update

# the ARD fields on a computer.



# This will pull Real Name, User name, and Building from JSS via API. Change the

# variables to pull different information and push to the ARD Fields.



import urllib

import subprocess

import os.path

import xml.etree.ElementTree as ET





jssAPIuser = 'apiuser'

jssAPIpass = 'apipass'

jssURL = 'https://' + jssAPIuser + ':' + jssAPIpass + 

    '@jss.server.com:8443'





def jamf_check():

    if os.path.exists('/usr/sbin/jamf'):

        jamfbin = '/usr/sbin/jamf'

    elif os.path.exists('/usr/local/bin/jamf'):

        jamfbin = '/usr/local/bin/jamf'

    return jamfbin





serial = subprocess.Popen("system_profiler SPHardwareDataType |grep -v tray 

    | awk '/Serial/ {print $4}'", shell=True, stdout=subprocess.PIPE).

    communicate()[0].strip()



url = jssURL + 

    '/JSSResource/computers/serialnumber/' + serial

uh = urllib.urlopen(url)

data = uh.read()

tree = ET.fromstring(data)

location = tree.findall('location')

full_name = location[0].find('real_name').text

user_name = location[0].find('username').text

building = location[0].find('building').text



updateARD = subprocess.check_output([jamf_check(), 'setARDFields', '-1', full_name, '-2', user_name, '-3', building])

that worked fine for me, thank you! :-)