On 26-Nov-14 23:45, Nicolás Alvarez wrote: > I'm not sure how to handle rollback. Suppose A.msi is already > installed, I install B.msi, the update-index CA runs, and for some > reason installation fails and rolls back. The correct result is to > have the index with only pluginA.dll in it, as it was before the > installation started. Should the index updater store a backup that I > can restore in rollback? If so, when would that backup be deleted? Or > is it possible in a rollback to rerun the updater *after* pluginB.dll > has been deleted? Yes. Create a rollback custom action that does the same thing as the deferred custom action. You have the easiest case: Do the same thing on install, uninstall, rollback for each, patching, repair.
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