Use optional scp ant task within custom gradle plugin

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Real solution found by using SimonTheSorcerer’s approach (see http://stackoverflow.com/questions/12387407/use-jsch-to-implement-scp-and-additionally-not-reinvent-the-wheel)

Don’t use ant builder + taskdef, depend on the jars which ant uses and handle things more directly

build.gradle
dependencies { ... compile 'org.apache.ant:ant:1.9.3' compile 'org.apache.ant:ant-jsch:1.9.3' compile 'com.jcraft:jsch:0.1.51' compile 'javamail:javamail:1.3.2' compile gradleApi() }

RemoteCopy.groovy
`class RemoteCopy {
def host
def user
File keyfile

public RemoteCopy(def host, def user, File keyfile) {
    this.host = host
    this.user = user
    this.keyfile = keyfile
}

/**
 * Copies fileset to remove destination via scp user@host
 * @param from   fileset describing what should be copied
 * @param remoteDestinationPath
 */
public upload(File fromDir, def copyPattern, def remoteDestinationPath) {
    AntBuilder ant = new AntBuilder()

    def fileset = ant.fileset(dir: fromDir) {
        include(name: copyPattern)
    }


    SSHExec ssh = new SSHExec(host: host, username: user,
            keyfile: keyfile.absolutePath,
            passphrase: "",
            trust: "yes",
            command: "mkdir -p ${remoteDestinationPath}",
            verbose: "true")
    ssh.execute()

    Scp scp = new Scp(keyfile: keyfile.absolutePath, passphrase: "")
    scp.setRemoteTodir("${user}@${host}:${remoteDestinationPath}")
    scp.addFileset(fileset)
    scp.setProject(new Project()); // prevent a NPE (Ant works with projects)
    scp.setTrust(true); // workaround for not supplying known hosts file

    scp.execute();

}

`