Rollback

[MSG]

Originally Posted by Animaether

It's not impossible, but 'extremely simple' is not how I would choose to describe it in general

I was referring to the fact that it mostly requires just a bunch of ${If} statements, which are trivial to code if you're clearheaded enough. But sure, I stand corrected, it takes some effort to get it exactly right. :-)

(You could of course make two macros, one single and one recursive/wildcard...)

[Animaether]

Originally Posted by MSG

(You could of course make two macros, one single and one recursive/wildcard...)

Well that's something I addressed toward the end... now you want to support /x as well.
So now you need macros:
File
FileR
FileX
FileRX

Now add /a and /nonfatal Granted, those are a little more obscure, but you can see how things quickly tend to explode into a number of macros. Hence why instead one might have something like a context switch...
${NonFatal} true
${FileSomething} a x ...
${FileSomething} b x ...
${FileSomething} c x ...
${NonFatal} False

But you phrased it well when you said

it takes some effort to get it exactly right. :-)

[mgillespie]

And this was precisely the reason we decided on a change deep down at file writing level, as it works regardless of how the file is added to the installer :-)

[Animaether]

Originally Posted by mgillespie

And this was precisely the reason we decided on a change deep down at file writing level, as it works regardless of how the file is added to the installer :-)

Only to an extent, though, if I read your original post right:

Originally Posted by mgillespie

We check to see if it already exists, if it does, we append the existing filename with the .previous extension and then write the new file.

So what if filename.previous already exists?

Originally Posted by mgillespie

On uninstall, it's simply a process of recursively scanning the installation folder, if we find a .previous, delete the original file and restore the .previous version.

And what if 'the original' is not actually -your- original?

Doing it 'right' will never be easy - if even possible at all - but there's certainly room for improvement.