Yes. Curious why you want to support downgrades? Don't hear that very often.
On Mon, Apr 15, 2013 at 8:51 AM, Alain Forget <afor...@cmu.edu> wrote: > This is very insightful, thanks! So my MajorUpgrade tag looks like this: > > <MajorUpgrade AllowDowngrades="yes" Schedule="afterInstallInitialize" /> > > The WiX manual ( http://wix.sourceforge.net/manual-wix3/major_upgrade.htm) > says that the Schedule="afterInstallInitialize" puts the > RemoveExistingProducts before anything is installed. So I think this is > good, safe, and the way we want it, correct? > > You also made a very good observation about possible shared resources. > Fortunately, our software isn't installing anything that > other programs use (at least I can't imagine how that can happen). > > Alain > > -----Original Message----- > From: Phil Wilson [mailto:phil.wil...@mvps.org] > Sent: April 14, 2013 15:52 > To: 'General discussion for Windows Installer XML toolset.' > Subject: Re: [WiX-users] AllowDowngrades="yes" warning LGHT1076 : ICE61 > > If your downgrade is effectively the same as an uninstall of the old > product followed by an install of the new product you should be > ok, and that depends on early sequencing of RemoveExistingProducts. > > If your RemoveExistingProducts is at the end somewhere, the upgrade is > like a merge of the components (when coomponent guids are > unchanged), and that's true of what you call a downgrade or an upgrade. I > don't think Windows suspends the file version overwrite > rules, and so will still apply them. If your old version has files with > version 5.0, and the new one has versions of > 6.0 a downgrade may leave you with the old version product with the 6.0 > file versions. That's my recollection anyway, and that's why > the best downgrade is simply to uninstall the broken new product and > reinstall the old one from the install media that you kept, > right? > > Keep in mind components can be shared - let's say your new product > installed new shared Microsoft components that updated files > because of file version rules. Uninstalling that new product will simply > decrease the ref count on them and the new versions will > remain on the system. Reinstalling your older product will also apply file > version rules and those Microsoft files will not be > replaced with older versions from your older install. That's the same > thing that happens when your REP is at the end. So I think > that's the issue > - you can end up with an "older" product with a mishmash of file versions > that were probably never designed or tested to work > together. Obviously deserves a test and a sanity check to be sure I'm > remembering this correctly. > > Phil > > > -----Original Message----- > From: Alain Forget [mailto:afor...@cmu.edu] > Sent: Saturday, April 13, 2013 1:54 PM > To: wix-users@lists.sourceforge.net > Subject: [WiX-users] AllowDowngrades="yes" warning LGHT1076 : ICE61 > > I've recently added the AllowDowngrades="yes" attribute to my MajorUpgrade > element, which resulted in the following light warning: > > warning LGHT1076 : ICE61: This product should remove only older versions > of itself. No Maximum version was detected for the current > product. > (WIX_UPGRADE_DETECTED) > > In a similar post ( see http://sourceforge.net/p/wix/bugs/2405/ ), Rob > explains that the warning is produced by the Windows > Installer / ICE team, and that they believe allowing downgrades or same > version upgrades is a bad idea. > > The reason I think we need to enable downgrades is if we push a new major > upgrade, but find out there's some critical and > hard-to-fix flaw we missed, and then want to quickly and easily rollback > to an older version. > > So the warning is making me wonder if there's a flaw in my logic. Your > thoughts? > > Alain > > > *************************************** > Alain Forget, Ph.D. > Postdoctoral Researcher > CyLab, Carnegie Mellon University > afor...@cmu.edu > http://cups.cs.cmu.edu/~aforget/ > *************************************** > > > > > ---------------------------------------------------------------------------- > -- > Precog is a next-generation analytics platform capable of advanced > analytics on semi-structured data. The platform includes APIs for > building apps and a phenomenal toolset for data science. Developers can > use our toolset for easy data analysis & visualization. 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