Gradle could not find method XYZ for arguments. - gradle

Question

a bit new to Gradle and Groovy trying to use the following task: http://bmuschko.github.io/gradle-docker-plugin/docs/groovydoc/com/bmuschko/gradle/docker/tasks/image/DockerPushImage.html
as folows:
task pushImageDev(type: DockerPushImage) {
imageName "xxxxxx:5000/${project.name}-${appEnviroment}:${version}"
registryCredentials {
email = 'none#your.business'
url = 'xxxxxx:5000'
username = 'xxxxxx'
password = 'xxxxxx'
}
}
But I keep getting...
Could not find method registryCredentials() for arguments [build_21ymvy7kfomjn3daqwpuika10$_run_closure8$_closure18#dd69c19] on task ':pushImageDev' of type com.bmuschko.gradle.docker.tasks.image.DockerPushImage

Answer 1

I believe you can only use registryCredentials method within the docker task configuration, and not in a custom task, like
docker {
registryCredentials {
url = 'https://gcr.io'
username = '_json_key'
password = file('keyfile.json").text
}
}
If you wanted to create a custom task, you probably have to create an actual instance of DockerRegistryCredentials to pass, like
task pushImageDev(type: DockerPushImage) {
imageName "xxxxxx:5000/${project.name}-${appEnviroment}:${version}"
registryCredentials(new DockerRegistryCredentials(...));
}
The reason is that registryCredentials {...} is an extension defined in DockerExtension.groovy, which does not work for custom tasks. It is not a setter for the field registryCredentials inside class DockerPushImage.
What also works is to nest a registry credentials call inside a docker call inside the custom task, though I am not sure why:
task pushImageDev(type: DockerPushImage) {
appEnviroment = 'dev'
imageName "xxxxxx/${project.name}-${appEnviroment}:${version}"
docker {
registryCredentials {
username = "${nexusUsername}"
password = "${nexusPassword}"
}
}
}