| Repackaging versus Wrapping There is an alternative to full MSI repackaging of a black-box install called "wrapping" that maintains the original structure of the application setup program, but uses MSI as the entry-point. By utilizing the MSI engine as a wrapper and delivery mechanism, the MSI database serves as a shell to load an installation program onto the remote machine, launch the original setup code, and terminate the MSI engine. Although this approach can be achieved by using MSI wrapping, the maintenance and potential errors on the target machine will often lead to testing and debugging times nearly equivalent - and often greater - to that of a normal structured repackaging process. The problems exist in reliance on the original application vendor's setup code; if the original setup program was not written to be deployed in silent mode, unattended mode, or a lock-down environment, the installation will typically fail and the administrative will have no alternative but to visit the end-user machine for resolution or request assistance of the end-users themselves. The ultimate level of reliability will, in this case, be determined by the resiliency of the original application vendor's install. By repackaging an installation to a true MSI database, many of the deployment errors that would be encountered through wrapping can be avoided or eliminated.  |
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