src/setup-bazelisk/src.main.kts [294:320]:
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fun Path.getOrTemp(): Path {
    if (Files.notExists(this)) {
        try {
            Files.createDirectories(this)
        } catch (e: IOException) {
            return fallbackWithWarning(this, e)
        }
    }
    if (Files.isDirectory(this)) {
        try {
            Files.createTempFile(this, "write-test-", ".tmp").let { testFile ->
                Files.deleteIfExists(testFile)
            }
            return this
        } catch (e: IOException) {
            return fallbackWithWarning(this, e)
        }
    }
    return fallbackWithWarning(this, IOException("Not a directory"))
}

fun fallbackWithWarning(path: Path, cause: Exception): Path {
    val tmpDir = System.getProperty("java.io.tmpdir")
        ?: throw IllegalStateException("No 'java.io.tmpdir' defined", cause)
    writeWarning("Installation path '$path' is not writable, using '$tmpDir' (Switch to 'Verbose' log level to see stacktrace)")
    writeDebug(cause.stackTraceToString())
    return Paths.get(tmpDir)
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src/setup-node/src.main.kts [286:312]:
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fun Path.getOrTemp(): Path {
    if (Files.notExists(this)) {
        try {
            Files.createDirectories(this)
        } catch (e: IOException) {
            return fallbackWithWarning(this, e)
        }
    }
    if (Files.isDirectory(this)) {
        try {
            Files.createTempFile(this, "write-test-", ".tmp").let { testFile ->
                Files.deleteIfExists(testFile)
            }
            return this
        } catch (e: IOException) {
            return fallbackWithWarning(this, e)
        }
    }
    return fallbackWithWarning(this, IOException("Not a directory"))
}

fun fallbackWithWarning(path: Path, cause: Exception): Path {
    val tmpDir = System.getProperty("java.io.tmpdir")
        ?: throw IllegalStateException("No 'java.io.tmpdir' defined", cause)
    writeWarning("Installation path '$path' is not writable, using '$tmpDir' (Switch to 'Verbose' log level to see stacktrace)")
    writeDebug(cause.stackTraceToString())
    return Paths.get(tmpDir)
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