useLocalScope to true so that it works in CLM

[TylerLeonhardt]

.AddScript("0") dot sources the script. Since it's created in C#, the script is considered trusted... You can't dot source trusted scripts into a runspace that is running in ConstrainedLanguage mode otherwise it throws an exception.

This allows PSReadLine to be loaded in the PowerShell extension for VS Code when running in ConstrainedLanguage mode.

[TylerLeonhardt]

cc @daxian-dbw if this could be backported to 2.0.x I'd really appreciate it. Then I can ship a PowerShell stable extension with ConstrainedLanguage mode support with PSRL.

[daxian-dbw]

@TylerLeonhardt The change is benign, but there is another use of AddScript here that happens at the initialization of PSReadLine. Since you didn't change that one, I assume it didn't cause a problem, so I'm not sure if your change in this PR is the root cause of your problem or something else more fundamental is wrong.

[TylerLeonhardt]

@daxian-dbw that code you shared is wrapped in a try/catch. The error is probably swallowed. This change I made is the only change needed to prevent a "classic PSRL exception" from showing up in my console over and over again.

[TylerLeonhardt]

After my last commit, the history file is "Visual Studio Code Host_history.txt"

[daxian-dbw]

When a script runs from within a nested pipeline, the script will be treated as FullLanguage, see the code here.

PSReadLine is invoked directly from within PS extension, whose pipeline thread (default Runspace) runs in ConstrainedLanguage when the machine is locked down.
.AddScript will make the script FullLanguge but the default Runspace is ConstrainedLanguage, so the invocation will fail due to AddScript(string) is dot-sourcing.

So adding useLocalScope: true is necessary for PS extension to use PSReadLine in constrained language mode.
I will publish version 2.0.2 to service this change. @TylerLeonhardt Can you please verify if there is anything else in PSReadLine that will be required for it to work in PSES in CLM?

[TylerLeonhardt]

@daxian-dbw can you get that 2.0.2 version out for me?

[daxian-dbw]

@TylerLeonhardt Will do. I'm currently busy on the .NET CAP work, can it wait till early next week?

[TylerLeonhardt]

Yeah that's fine