In article <048288cf0239f24a8c2299e69f020b0501293...@exchange.panologic.com>,
"Ashwin Chandra" <achan...@panologic.com> writes:
> I am trying to perform a rollback custom action when an upgrade install
> fails. However, I require the original files on the system (before the
> installer updates them) to execute this rollback custom action.
> [...]
RemoveExistingProducts is the standard action that removes previous
versions of the application before installing the current one.
Where do you have REP sequenced in your upgrade?
It sounds to me like your rollback action should be in the MSI of the
old version being upgraded rather than in the MSI of the new version.
You can do this by applying a patch to the existing version before
upgrading, using a bootstrapper.
I've done these sorts of things where a failed upgrade has to be
patched up in order for the manual uninstall of the previous version
or the next upgrade attempt to succeed. I've compensated for buggy
prior versions both by patching the previous version before updating
and by putting special error handling code in the bootstrapper that
executed the upgrade. It feels a little bit ugly, but it works. As
for when you do one and not the other, well, I patched stuff in the
existing product MSI when I needed to do adjust the behavior of
something that was essentially in the middle of the install
transaction for the previous version. For cleaning up after a failed
upgrade, I put that in the bootstrapper since it didn't involve
applying a patch to the previous version (risky for us at the time)
and we already required a bootstrapper anyway.
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