FailIfClusterIsNotReachable checks that Kubernetes is reachable.

HasKubernetesFileExtension is for determining if a file under a glob pattern is deployable file format.

IsKubernetesManifest is for determining if a file is a valid Kubernetes manifest.

NewImageList creates a new ImageList.

ParseImagesFromKubernetesYaml parses the kubernetes yamls, and if it finds at least one valid Kubernetes object, it will return the images referenced in them.

TopLevelOwnerKey returns a key associated with the top level owner of a Kubernetes resource in the form Kind-Name.

WaitForDeploymentToStabilize waits until the Deployment has a matching generation/replica count between spec and status.

WaitForPodInitialized waits until init containers have started running.

WaitForPodSucceeded waits until the Pod status is Succeeded.

ImageList implements PodSelector based on a list of images names.

PodSelector is used to choose which pods to log.

TODO(nkubala): remove this when podSelector is moved entirely into Deployer.