Add Pod Status when pod is pending by going through pending container

pkg/skaffold/kubernetes/status_check.go

@@ -0,0 +1,114 @@
+/*
+Copyright 2019 The Skaffold Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package kubernetes
+
+import (
+	"fmt"
+
+	v1 "k8s.io/api/core/v1"
+	meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+)
+
+const (
+	success = "Succeeded"
+	running = "Running"
+	unknown = "Unknown"
+	pending = "Pending"
+)
+
+// for testing
+var (
+	waitingContainerStatus = getWaitingContainerStatus
+)
+
+type PodStatus struct {
+	phase string
+	err   *PodErr
+}
+
+type PodErr struct {
+	reason  string
+	message string
+}
+
+func (e *PodErr) Error() string {
+	return fmt.Sprintf("pod in error due to reason: %s, message: %s", e.reason, e.message)
+}
+
+func GetPodDetails(client kubernetes.Interface, ns string, podName string) PodStatus {
+	pod, err := client.CoreV1().Pods(ns).Get(podName, meta_v1.GetOptions{})
+	if err != nil {
+		return PodStatus{err: &PodErr{message: err.Error()}}
+	}
+	switch pod.Status.Phase {
+	case v1.PodSucceeded:
+		return PodStatus{phase: success}
+	case v1.PodRunning:
+		return PodStatus{phase: running}
+	default:
+		return getPendingDetails(pod)
+	}
+}
+
+func getPendingDetails(pod *v1.Pod) PodStatus {
+	// See https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/#pod-conditions
+	for _, c := range pod.Status.Conditions {
+		switch c.Status {
+		case v1.ConditionUnknown:
+			return newPendingStatus(unknown, c.Message)
+		default:
+			cs := append(
+				append(pod.Status.InitContainerStatuses, pod.Status.ContainerStatuses...),
+				pod.Status.EphemeralContainerStatuses...,
+			)
+			reason, detail := waitingContainerStatus(cs)
+			return newPendingStatus(reason, detail)
+		}
+	}
+	return newUnknownStatus()
+}
+
+func getWaitingContainerStatus(cs []v1.ContainerStatus) (string, string) {
+	// See https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/#container-states
+	for _, c := range cs {
+		if c.State.Waiting != nil {
+			return c.State.Waiting.Reason, c.State.Waiting.Message
+		}
+	}
+	return success, success
+}
+
+func newPendingStatus(r string, d string) PodStatus {
+	return PodStatus{
+		phase: pending,
+		err: &PodErr{
+			reason:  r,
+			message: d,
+		},
+	}
+}
+
+func newUnknownStatus() PodStatus {
+	return PodStatus{
+		phase: unknown,
+		err: &PodErr{
+			reason:  unknown,
+			message: unknown,
+		},
+	}
+}