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Custom Packages with Composer
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You can also use Composer to generate other types of packages. One of the product s powerful features is its tool for taking system-state snapshots. To put the feature to use, build an original file-system state list (by performing a software installation or configuration change) and have Composer record it. Then build another and record that.
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CHAPTER 6: Mass Deployment
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Comparing the before and after snapshots lets you create a list of modified files, which (for the most part) will be representative of the software you installed. To start the process, from the main screen of Composer, click on the New Package icon in the toolbar. In the left-hand pane of the dialog that appears (Figure 6-22), choose the Snapshot option. In the main part of the window, you should see three options: Normal Snapshot, New & Modified Snapshot, and Monitor File System Changes. For the sake of speed, pick the last. This option does its monitoring using FSEvents, which is the primary system behind Spotlight and Time Machine and provides the ability for an application to track file system changes. You could use Composer s Normal Snapshot, which creates before and after picture but records only enough data to detect new (rather than modified) files. Unfortunately, this method, though faster (creating a snapshot is a fairly slow process) will miss any file modifications. That, potentially, is a large problem, and it s the reason for the New & Modified option---which, sadly, takes even longer than Normal Snapshot. However, it has benefits. One of the main advantages to using snapshots instead of FSEvents is that change-tracking persists through reboots and is generally more stable when there are large numbers of data changes.
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Figure 6-22. Making Snapshot Packages with Composer
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CHAPTER 6: Mass Deployment
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Once you ve chosen Monitor File System Changes, at the resulting screen, type a name for the software package and then click on the Begin button to initiate filesystem activity-monitoring. Now, just install the software as you would normally. You can minimize Composer 7 if needed, but make sure to leave the application running. When you complete the software installation and configuration, come back to the Composer 7 window and click on the Build Package button (Figure 6-23).
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Figure 6-23. Capturing a Snapshot Package
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Under SOURCES in Figure 6-24, you ll see a new item bearing the name you provided in the previous step. You can now select the source list and browse the contents of the package. Be especially careful to note any files that shouldn t be members. For example, we installed Firefox and are creating a snapshot package of Firefox. But we ended up with data from /var/servermgrd and /var/vm. To remove the extraneous files, you click on /var in the package and then on the Delete button in the Composer 7 toolbar.
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CHAPTER 6: Mass Deployment
When first building packages from snapshots or monitoring, including unnecessary and potentially harmful files is a very common mistake. So again, take extra care to check thoroughly for unwanted items. You should be especially vigilant about getting rid of unnecessary items in /System, /Library, /private, /var, and /etc.
Figure 6-24. Browsing Package Contents and assigning permissions with Composer
Once you ve whittled the package down appropriately, navigate to Package Settings in the left pane of the dialog and type the information for the package into the Description.plist file. Finish by checking the other content that will go into the package as well as by verifying the permissions for the files that will be installed, and finally, click on Build as PKG. If, instead, you click on Build as DMG, the same data that would otherwise be in the package will go into your DMG file. But as mentioned previously, packages give you the ability to deploy scripts and ensure version control, making them the preferred choice, in general. So choose Build as PKG, select a valid location for saving your package (you ll get a prompt to do so), and finally, test the package. But once you ve gone to the trouble of creating a package and have been using it for a while, expect to encounter expect to encounter one of the more annoying aspects of being on a deployment team: Vendors continue to update their offerings. Now you have to
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