Makes gradle go automatically go offline

checknetwork.init.gradle.kts

/**
* Makes gradle go automatically offline.
*
* Store in $HOME/.gradle/init.d/checknetwork.init.gradle.kts
*/
import java.io.IOException
import java.net.InetSocketAddress
import java.net.Socket
import java.net.SocketException
import java.net.UnknownHostException
import org.gradle.api.logging.Logging

apply<CheckNetwork>()

class CheckNetwork: Plugin<Gradle> {
    private val logger = Logging.getLogger(CheckNetwork::class.java)

    override fun apply(gradle: Gradle) {
        if (gradle.startParameter.isOffline) {
            // Gradle is run with `--offline`
            return
        }
        var goOffline = false
        val address = InetSocketAddress("google.com", 80)

        try {
            Socket().use {
                it.connect(address, 3_000)
                goOffline = !it.isConnected()
            }
        } catch(e: UnknownHostException) {
            logger.info("[CheckNetwork] Unknown host: ${e.message}")
            goOffline = true
        } catch(e: SocketException) {
            logger.info("[CheckNetwork] Connect failure: ${e.message}")
            goOffline = true
        } catch(e: IOException) {
            logger.error("[CheckNetwork] io error", e)
            goOffline = false
        }

        gradle.startParameter.setOffline(goOffline)

        if (goOffline) {
            logger.lifecycle("[CheckNetwork] Going offline (--offline)")
        }
    }
}

Modified version of Schalk Cronjé he gave me in his tweet