See error message when swift.path is set

[award999]

Describe the bug
On windows (UPDATE: also seen on macOS) even when swift.path setting is set and the swift exe exists in that directory, see this error message

Seems to only happen when swift is not in PATH

To Reproduce
Steps to reproduce the behavior:

1. Correctly select your toolchain
2. Make sure swift is not in PATH
3. Reload window

Expected behavior
If have a valid toolchain selected, shouldn't matter if cannot detect in PATH

Environment

• OS: Windows 11
• Swift version (output of swift --version): 6.0-SNAPSHOT and 5.10
• Visual Studio Code version:
• vscode-swift version:

[matthewbastien]

Did some testing around this on Windows and I am able to reproduce if I remove the path to the swift runtimes directory. The swift toolchain installer actually adds three separate directories to PATH:

1. <user-dir>\AppData\Local\Programs\Swift\Runtimes\6.0.0\usr\bin
2. <user-dir>\AppData\Local\Programs\Swift\Toolchains\6.0.0+Asserts\usr\bin
3. <user-dir>\AppData\Local\Programs\Swift\Tools\6.0.0

If that first path to the Runtimes directory is malformed or deleted, then swift.exe will fail to launch and cause the extension to be unable to resolve the toolchain version. Unfortunately, this means that selecting a toolchain folder will never work on Windows. I suspect that this will require changes to the toolchain itself to get working.

[award999]

Opened swiftlang/swift-installer-scripts#303 to see if there is anything that can be done with toolchain

[award999]

Not to be fixed in install scripts