postinst runs after prerm when updating

[micheljung]

I haven't been able to create an minimal working example yet, but I'm close to it.

It seems to boil down to this:

msi {
  postinst = '''
set shell = CreateObject("WScript.Shell")
shell.LogEvent 4, "postinst executed"
'''
  prerm = '''
set shell = CreateObject("WScript.Shell")
shell.LogEvent 4, "prerm executed"
'''
}

The InstallExecuteSequence from the wxs file:

    <InstallExecuteSequence>
      <Custom Action="Postinst_Script0" Before="InstallFinalize">NOT Installed OR REINSTALL OR UPGRADINGPRODUCTCODE</Custom>
      <Custom Action="SetPropertiesPostinst_Script0" Before="Postinst_Script0"/>
      <Custom Action="Prerm_Script0" After="InstallInitialize">REMOVE</Custom>
      <Custom Action="SetPropertiesPrerm_Script0" Before="Prerm_Script0"/>
    </InstallExecuteSequence>

When you install, you get:

postinst executed

When you remove an installed version, you get:

prerm executed

When you install a new version over an existing one, you get:

prerm executed
postinst executed
postinst executed

Would you agree that this is a bug?

[Horcrux7]

If you install a new version/update of your installer then msi

• remove/uninstall the old installation with the old installer first.
• run the new installer to install the new version

That I expect that "prerm" is called before "postinst" of the new installer. That the "postinst" is call 2 times seems me sub optimal. The execution condition seems not perfect. Do you have a suggestion?

A workaround is to use a wxs template. There you can set all execution conditions and the point of actions like you want.

[Horcrux7]

Any suggestions?

After looking at https://stackoverflow.com/questions/320921/how-to-add-a-wix-custom-action-that-happens-only-on-uninstall-via-msi/731700#731700 the condition for the Postinst_Script looks ok for me.

The script should be executed on Install, Repair and Upgrade. This should be valid with: NOT Installed OR REINSTALL OR UPGRADINGPRODUCTCODE