[TSVN] Upgrading + Verson numbering

Hi all

Been quiet for a few days - busy.

Windows Installer has a curious way of doing upgrades to packages.
First of all, there are several types; over on the WiX mailing list,
it's a generally accepted thing that the "Major Upgrade" flavour is the
way to accomplish upgrades. The gist of what happens is that the
version number is recorded by Windows Installer, and when another
install with the same UpgradeCode GUID is attempted, a version number
comparison happens.

However, given a version number of the form a.b.c.d, this comparison
only takes into account a.b.c - no d. What this means for us is that
the people that test the nightlies therefore can't upgrade without
errors - since the version number that Windows Installer cares about
does not change between previous release and vNextNightly, the package
is installed side by side, and the installer complains.

What needs to happen for Major Upgrades to work is for the version
number to increment each iteration, else Windows Installer thinks it's
the same package, and doesn't get rid of the old one.

So - nightly users, until this issue gets resolved (after discussion and
later implementation of whatever we decide), please uninstall before
installing the next nightly.

At the moment, I can only really think of one resolution, and that's to
change our version numbering scheme so that we end up with a.b.d, where
d is the revision number. I don't know the impact of that change
through the project, but it would be a quick fix that would work well -
I _hope_ it's only a cosmetic thing, since it's certainly the easiest
for me to handle from the installer package's point of view.

Any other ideas or consequences?

Pete

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