On 20/07/2011 10:29 AM, John Fox wrote:
Dear R-devel list members,
For several years, I've created a custom R installer for my students who use
Windows. When I test the installer on my own Windows machines, selections in
the installation dialogs reflect my previous choices, which I suppose are
saved in the Windows registry.
I'd like to be able to see what a student who has never installed R before
will see, to verify that an installation that takes all defaults in the
custom installer produces the desired result. In the past, I've dealt with
this problem by finding a Windows machine on which R has never been
installed, but that's inconvenient (and, as R proliferates will, I hope,
become impossible!). Is there a better approach?
The settings are saved to the registry by the installer, Inno Setup, and
restored automatically (for most of them), or using its
"GetPreviousData" function (for the R specific ones). I don't think
there is a way to tell the installer to ignore the previous data, but
there might be.
I believe if you uninstall R then the settings will be forgotten,
because the settings are saved in locations like
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\R
for Windows 2.13.0_is1 in string values named
"Inno Setup: *" for the ones used internally, and "Inno Setup Codefile:
*" for the ones specific to R.
It's probably okay to delete that whole key and then it will forget the
old settings, but that seems risky.
There's a command line option to the installer called "/SAVEINF" which
saves the settings to a file and "/LOADINF" which loads them from a
file, but I don't see how to tell it to just ignore the registry settings.
Duncan Murdoch
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