Conditionally install files based on Command Line Argument during WIX Install - properties

Question

I am wanting to install files during a wix install conditionally whether a command line parameter has been set
e.g. I have the following file, which only installs if a DEBUG flag has been set
<Component Id="file.pdb" Guid="SOME-GUID">
<Condition>DEBUG</Condition>
<File Id="file.pdb" Source="file.pdb" KeyPath="yes" Vital="no" />
</Component>
I have added the DEBUG property and read it in from the command line. The File never installs though, I am perplexed as to why?

Answer 1

Solved the issue. Below is an explanation of what I was doing wrong and what I did to solve it
I had created an installer (.msi) and was using the following cmd line args to start it up
msiexec -i prog.msi DEBUGPROPERTY=True
I had several merge modules with components which would install depending on whether this property was set which were getting the property injected into them like so...
<Merge
Id="SomeID"
Language="1033"
SourceFile="Module.msm"
DiskId="1">
<ConfigurationData
Name="debugProperty"
Value="[DEBUGPROPERTY]" />
What I was missing was in the merge modules (.msm) i needed the following code
<Configuration Name='debugProperty' Format='Text' DefaultValue='[DEBUGPROPERTY]'/>
<Substitution Table='CustomAction' Row='setDebugProperty' Column='Target' Value='[=debugProperty]'/>
<CustomAction Id='setDebugProperty' Property='DEBUGPROPERTY' Value='[DEBUGPROPERTY]'/>
<InstallExecuteSequence>
<Custom Action='setDebugProperty' Before="LaunchConditions">1</Custom>
</InstallExecuteSequence>
This allowed me to access the property DEBUGPROPERTY inside this module so i could restrict whether a file was installed at install time or not, like so
<Component Id="File.pdb" Guid="SOME-GUID">
<Condition>DEBUGPROPERTY</Condition>
<File Id="File.pdb" Source="File.pdb" KeyPath="yes" Vital="no" />
</Component>
This now works, and allows me to install .pdb files during an install if i include this argument.