2 replies to this topic

[VBScab]

At what stage does WI write to HKCR\Installer\Products\(Munged Product Code) and HKML\Software\Microsoft\Windows\CurrentVersion\Uninstall\(Product Code)?

I ask because I have an MSI authored by AN Other which I'm driving via a VB Script. The install fails during a Custom Action and I can see the roll-back occurring (with basic UI). When MSIExec returns, the script uses the Installer object to test the installed state of the product and it shows as installed. Sure enough, when I check the registry, the keys above are present.

Shouldn't these be removed during a rollback? I'm guessing that the CA is in the wrong place, in that the registry stuff is written and THEN the CA runs. My problem is, which built-in CA writes the registry info detailing the install state? MSDN doesn't want to tell me...

[Stefan Krueger]

I think this happens during the RegisterProduct phase. A verbose log should tell you more.
Is the CA scheduled between InstallInitialize and InstallFinalize, and is scheduled for deferred execution? These are requirements for rollback.

[VBScab]

Is the CA scheduled between InstallInitialize and InstallFinalize?
Yes
and is scheduled for deferred execution
Yes

Further experimentation shows that the rollback doesn't always occur, depending on which CA fails.