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<https://docs.gradle.org/current/javadoc/org/gradle/process/BaseExecSpec.html#setStandardInput-java.io.InputStream-> ?

Sure, I know about that API. The problem is - settings streams is not allowed for `providers.exec { }`. An assertions fails.

<@UFYHH7ZNZ> Ah <https://docs.gradle.org/7.5/userguide/configuration_cache.html#config_cache:requirements:external_processes> shows you how to do that but you might not like it

I need something like `echo "message" | jshell -` . So far I do
```exec { ... 
  standardInput = """message""".byteInputStream()
}```
and the same as `providers.exec`  does just crash

... and I cannot have a provider to call a specific task (a viable workaround, but not possible)

My point - it's a pity that `providers.exec`  does not allow passing a constant string as STDIN (the exec DSL does not allow that at all).
In fact - it's good idea to implement a custom ValueSource&lt;..&gt; as workaround. Kudos
Still the problem - is that possible to make a ValueSource&lt;..&gt; execute a project task?