Unable to install dnx (Join-Path $_ "runtimes" failed)

[VeselovAndrey]

Unable to install dnx.

 Join-Path : Cannot bind argument to parameter 'Path' because it is an empty string.
 At C:\Users\appveyor\.dnx\bin\dnvm.ps1:207 char:59
 + $RuntimeDirs = $RuntimeHomes | ForEach-Object { Join-Path $_ "runtimes" }
 +                                                           ~~
 + CategoryInfo          : InvalidData: (:) [Join-Path], ParameterBindingValidationException
 + FullyQualifiedErrorId : ParameterArgumentValidationErrorEmptyStringNotAllowed,Microsoft.PowerShell.Commands.JoinPathCommand

Full log
https://ci.appveyor.com/project/VeselovAndrey/filewarehouse

[dougbu]

/cc @BrennanConroy

If $env:DNX_HOME and $env:DNX_GLOBAL_HOME aren't already defined, $RuntimeHomes is set to ;c:\ProgramData\Microsoft DNX. With that, dnvm.ps1 blows up at the line shown above. A $env:DNX_HOME value wasn't previously required and only a few commands set it.

Side question: When is [Environment]::ExpandEnvironmentVariables($_) required?

[Daniel15]

As a sidenote, if you select "Visual Studio 2015" for AppVeyor's "Operating system" setting, DNVM will be preinstalled and you can just do:

dnvm update-self
dnvm install 1.0.0-beta7

[VeselovAndrey]

@dougbu Looks like you are right. I have set $env:DNX_HOME and $env:DNX_GLOBAL_HOME manually and install script was completed successfully. But I think install script should be updated to resolve this situation. Thanks.

@Daniel15 Thank. I'm using "Visual Studio 2015" as OS Settings but prefer to keep script as much independent as possible.

[Eneuman]

@VeselovAndrey Can you please share your workaround?
This error also occures when running builds on VSO when you need to install mutiple clrs.

[VeselovAndrey]

Before install DNX I have added following commands to my PowerShell script:

$env:DNX_HOME="Path to .dnx folder here like C:\Users\yourUserName\.dnx"
$env:DNX_GLOBAL_HOME="same path here"

[dougbu]

This is a duplicate of aspnet/dnvm#422. Will track the fix there.