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These four options can handle the majority of your interactions, and you can learn about handling others by examining the PlistBuddy man page (type man PlistBuddy from any 10.5 machine). As mentioned, while the defaults command is very useful for basic plist interaction, PlistBuddy is absolutely essential for more-complex interactions. An excellent example of this involves modifying an OS X machine s SystemConfiguration preferences file. The file, which resides in /Library/Preferences/SystemConfiguration/preferences.plist, contains extensive data about a computer s configuration including the ComputerName value, as noted in the previous section where we discussed defaults. In that context, we recommended that you not use defaults, opting to use the scutil instead. But scutil can only modify ComputerName for an active running system. What if you want to change the computer name on a non-running system, as in a mass-deployment imaging situation While most such systems we discuss in this chapter contain some sort of automated naming systems, if you decide to roll your own using ASR, you may want to modify the system configuration on a non-active system after deploying an image. For this scenario, PlistBuddy is the perfect utility. First, though, you need a database of computer names to poll. The easiest structure to use for the data set is a flat-file CSV arrangement. For instance, consider the following data in a file:

MessageDigest digest=MessageDigest.getInstance("MD5"); byte[] data=privKey.getBytes(); digest.update(data); byte[] raw=digest.digest(pubKey.getBytes()); byte[] b64=Base64.encodeBase64(raw); return new String(b64);

Click the Apply Now and Done buttons. To complete the division of the preferences, select the original HomeSync computer group, switch to the Preferences Details editor, and remove Managed Background Sync Exclusions from the Once section of the Home Sync preferences. The result should resemble Figure 12-18. The exact contents might vary; the important thing is to ensure the Managed Background Sync Exclusions are removed.

00:1f:f3:d1:d5:c7,Macbook-1234 00:1f:f3:d1:55:77,Macbook-1234

where privKey and pubKey are the private and public keys, respectively. To configure this filter to review all URLs under the path /Ajax/data, we can add the following filter definition to the web.xml configuration file for our web application:

function BuildChoices(){ var strText = this.req.responseText; eval(strText); BuildList(strLastValue); bMadeRequest = false; }

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Here we have a very basic comma-delimited list consisting of computer MAC addresses and computer names. This CSV file could be stored on a remote server and provided via Web services. By using curl to fetch this remote CSV file and then PlistBuddy to modify the preferences .plist file on the newly imaged system, you can create a fairly basic post-imaging script that can dynamically rename a machine. Say the data is stored in the file machinedata.csv on the Web server NetBoot.myco.com, and we ve just finished laying down an image to our volume mounted at /Volumes/MacbookHD. Here s a script to update this newly imaged system with the appropriate ComputerName automatically:

The responseText property of the returned request object lets us obtain the text from the Ajax request. To allow this returned string to be used by our JavaScript code, we need to use the eval() method. The eval() method evaluates the string contained within its parentheses. In this case, it recognizes that the string is a variable declaration to make a new array. It processes the array so that we can access it. If we were just to write the string to the page, it would not be accessible to the JavaScript statement. Developers frown on using the eval() method since it is known to be slow. However, in this case we are eliminating the need to loop through an XML document on the client to obtain the values. Now we can call the function BuildList() to format and display the returned results. We also want to set our boolean bMadeRequest to false to inform the rest of the script that the request to the server is complete.

#!/bin/bash ## setup a variable for our offline system's system configuration file preferencesfile="/Volumes/MacBookHD/Library/Preferences/SystemConfiguration/preferences. plist" ## fetch the csv file curl http://NetBoot.myco.com/machinedata.csv -o /tmp/machinedata.csv ## get our primary ethernet MAC address ## this assumes we are booted off our target computer as opposed to imaging ## an external system over firewire ethernetAddress=$(ifconfig en0 | awk '/ether/ {print $2}') ## search our machinedata.csv file for the appropriate ComputerName computername=$(grep "$ethernetAddress" /tmp/machinedata.csv | awk F, '{print$2}') ## make sure we have a computername value, if not, use the ethernet address if [ -z "$computername" ]; then computername="Mac-$ethernetAddress" fi ## set the computer name on our offline volume's system configuration /usr/libexec/PlistBuddy c "Set:System:System:ComputerName $computername" "$preferencesfile" ## also update the bonjour name /usr/libexec/PlistBuddy -c "Set:System:Network:HostNames:LocalHostName $comutername" "$preferencesfile"

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