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I was able to work around it so far by setting imageId based off the output imageIdFile

imageId.set(imageIdFile.map { RegularFile it ->
    File file = it.asFile
    if(file.exists()) {
        return file.text
    }
    return null
})

But I’m not sure if this approach is the best one

A task can only have defined fine outputs, hence this trickery with the

imageIdFile

and

imageId

. But I actually wonder how CC should influence this, as

imageId

is an execution time thing. It is set during execution or during

outputs.upTpDateWhen

such both run after the cache configuration phase.