PowerShell Core cannot start a job using Windows PowerShell #7059
Description
When -PSVersion is specified, it should be respected. And all supported PSVersions (2.0 to 5.1) should be supported when the corresopnding version of Windows PowerShell is available.
Note that, when -PSEdition 2.0 is specified, Start-Job checks if PSv2 is installed using the method RemotingCommandUtil.CheckIfPowerShellVersionIsInstalled which will blindly throw exception in PSCore (see code below). If we want to support -PSEdition 2.0, then the #if CORECLR section of the method body should be removed.
internal static void CheckIfPowerShellVersionIsInstalled(Version version)
{
// Check if PowerShell 2.0 is installed
if (version != null && version.Major == 2)
{
#if CORECLR
// PowerShell 2.0 is not available for CoreCLR
throw new ArgumentException(
PSRemotingErrorInvariants.FormatResourceString(
RemotingErrorIdStrings.PowerShellNotInstalled,
version, "PSVersion"));
#else
// Because of app-compat issues, in Win8, we will have PS 2.0 installed by default but not .NET 2.0
// In such a case, it is not enough if we check just PowerShell registry keys. We also need to check if .NET 2.0 is installed.
...Steps to reproduce
PS:1> $job = Start-Job { $PSVersionTable.PSVersion } -PSVersion 5.1
PS:2> Receive-Job $jobExpected behavior
PS:2> Receive-Job $job
Major Minor Build Revision
----- ----- ----- --------
5 1 17134 81
Actual behavior
PS:2> Receive-Job $job
Major Minor Patch PreReleas BuildLabel
eLabel
----- ----- ----- --------- ----------
6 0 1
Environment data
> $PSVersionTable
Name Value
---- -----
PSVersion 6.0.1
PSEdition Core
GitCommitId v6.0.1
OS Microsoft Windows 10.0.17134
Platform Win32NT
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0