[release/v7.4.21] Add support for new WLDP setting EnableFileOnlyEntry - #28041
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Backport of #26752 to release/v7.4.21
Triggered by Aditya Patwardhan (@adityapatwardhan) on behalf of Patrick Meinecke (@SeeminglyScience)
Original CL Label: CL-Engine
/cc @PowerShell/powershell-maintainers
Impact
REQUIRED: Choose either Tooling Impact or Customer Impact (or both). At least one checkbox must be selected.
Tooling Impact
Customer Impact
Adds support for the Windows WLDP EnableFileOnlyEntry policy so managed systems can require a script file and disallow unintended interactive or ad-hoc PowerShell entry. Without the change, release/v7.4 does not honor this policy setting.
Regression
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This is not a regression.
Testing
Cherry-pick validated with git diff --check. Added PowerShell tests and HelpersSecurity module both parse successfully with no conflict markers. A focused ConsoleHost dotnet build was attempted after restore; it is blocked by pre-existing generated-resource errors for DotNetEventingStrings in Microsoft.PowerShell.CoreCLR.Eventing, unrelated to this change. Full validation is delegated to backport CI.
Risk
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High risk because this changes ConsoleHost startup and Windows WLDP policy enforcement. The implementation and tests are carried from the merged original PR, the sole conflict was a control-flow/formatting divergence, and the resolution preserved release-branch structure while retaining the intended successful return.
Merge Conflicts
src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHost.csconflicted because release/v7.4.21 retained older V2 socket-server formatting/control flow while the original PR used the refactored early-return form. Resolved by keeping the release context and usingreturn ExitCodeSuccessafterHyperVSocketMediator.Run, matching the surrounding release-branch server-mode paths and preserving the backport intent.