Util.getWinDirs throws an exception if PowerShell is in Constrained Language Mode #43
Description
If PowerShell is in Constrained Language Mode, that is PS C:\> $ExecutionContext.SessionState.LanguageMode prints ConstrainedLanguage instead of FullLanguage, Util.getWinDirs throws an exception which can be observed by running dev.dirs.DirectoriesTest:
sbt:directories> testOnly dev.dirs.DirectoriesTest
[info] Total time: 0 sec
[info] Compiling 1 Java source to C:\Project\prj\directories-jvm\target\test-classes ...
[error] Test dev.dirs.DirectoriesTest.testBaseDirectories failed: java.lang.RuntimeException: Couldn't find pwsh.exe or powershell.exe on path or in default system locations, took 2.545 sec
[error] at dev.dirs.Util.windowsFallback(Util.java:280)
[error] at dev.dirs.Util.getWinDirs(Util.java:161)
[error] at dev.dirs.BaseDirectories.<init>(BaseDirectories.java:274)
[error] at dev.dirs.BaseDirectories.get(BaseDirectories.java:246)
[error] at dev.dirs.DirectoriesTest.testBaseDirectories(DirectoriesTest.java:9)
[error] ...
[error] Caused by: java.io.IOException: no output from process
[error] at dev.dirs.Util.runCommands(Util.java:206)
[error] at dev.dirs.Util.runWinCommands(Util.java:241)
[error] at dev.dirs.Util.windowsFallback(Util.java:278)
[error] ... 41 more
[error] Failed: Total 1, Failed 1, Errors 0, Passed 0
[error] Failed tests:
[error] dev.dirs.DirectoriesTest
[info] Total time: 3 sec
[info] root / Test / testOnly: 3 sec
[error] (Test / testOnly) sbt.TestsFailedException: Tests unsuccessful
[error] Total time: 3 s, completed 19.11.2020 14:08:57
The inner exception java.io.IOException: no output from process is thrown because the PowerShell process exits with only printing to stderr and nothing to stdout.
PowerShell exits with errors when trying to execute the SCRIPT_START_BASE64 script. The error can be reproduced in a PowerShell console by executing the first line of that script:
PS C:\> $ExecutionContext.SessionState.LanguageMode
FullLanguage
PS C:\> [Console]::OutputEncoding = [System.Text.Encoding]::UTF8
PS C:\> $ExecutionContext.SessionState.LanguageMode = "ConstrainedLanguage"
PS C:\> $ExecutionContext.SessionState.LanguageMode
ConstrainedLanguage
PS C:\> [Console]::OutputEncoding = [System.Text.Encoding]::UTF8
Die Eigenschaft kann nicht festgelegt werden. Das Festlegen der Eigenschaft wird in diesem Sprachmodus nur für Kerntypen unterstützt.
In Zeile:1 Zeichen:1
+ [Console]::OutputEncoding = [System.Text.Encoding]::UTF8
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : PropertySetterNotSupportedInConstrainedLanguageNote that [Console]::OutputEncoding = [System.Text.Encoding]::UTF8 does not exit with an error in FullLanguage mode.
That Util.getWinDirs throws an exception if PowerShell is in Constrained Language Mode is the reason why the current sbt 1.4 versions are not usable in such environments as noted in #40 (comment) and coursier/coursier#1913.
A possible workaround to make sbt usable again would be removing this line.