[Python-Dev] Install-on-first-use vs. optional extensions (original) (raw)

"Martin v. Löwis" martin at v.loewis.de
Thu Sep 9 20:29:26 CEST 2004

Garth wrote:

Couldn't you conditionally run RegisterExtensionInfo?

This is what I currently do (see msi.py:build_database). Unfortunately, it doesn't work: Installer then unconditionally runs UnregisterExtensionInfo first, which removes any old extension information before installing a new one.

Now, this could also be made conditional, although defining the condition is difficult: If the user changes the extension from "installed" to "absent", UnregisterExtensionInfo should run. In any case, uninstalling the entire package (i.e. executing the toplevel REMOVE action) doesn't run the InstallExecuteSequence (I believe), which further complicates issues.

I've played with a number of options, and could not make it to work. I have given up now, but if you find a solution, please let me know.

Regards, Martin

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