mirror of
https://github.com/k3s-io/k3s.git
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86 lines
3.0 KiB
Go
86 lines
3.0 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package container
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import (
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"fmt"
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v1 "k8s.io/api/core/v1"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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ref "k8s.io/client-go/tools/reference"
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"k8s.io/kubernetes/pkg/api/legacyscheme"
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"k8s.io/kubernetes/pkg/features"
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)
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// ImplicitContainerPrefix is a container name prefix that will indicate that container was started implicitly (like the pod infra container).
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var ImplicitContainerPrefix = "implicitly required container "
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// GenerateContainerRef returns an *v1.ObjectReference which references the given container
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// within the given pod. Returns an error if the reference can't be constructed or the
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// container doesn't actually belong to the pod.
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//
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// This function will return an error if the provided Pod does not have a selfLink,
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// but we expect selfLink to be populated at all call sites for the function.
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func GenerateContainerRef(pod *v1.Pod, container *v1.Container) (*v1.ObjectReference, error) {
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fieldPath, err := fieldPath(pod, container)
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if err != nil {
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// TODO: figure out intelligent way to refer to containers that we implicitly
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// start (like the pod infra container). This is not a good way, ugh.
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fieldPath = ImplicitContainerPrefix + container.Name
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}
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ref, err := ref.GetPartialReference(legacyscheme.Scheme, pod, fieldPath)
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if err != nil {
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return nil, err
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}
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return ref, nil
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}
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// fieldPath returns a fieldPath locating container within pod.
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// Returns an error if the container isn't part of the pod.
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func fieldPath(pod *v1.Pod, container *v1.Container) (string, error) {
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for i := range pod.Spec.Containers {
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here := &pod.Spec.Containers[i]
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if here.Name == container.Name {
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if here.Name == "" {
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return fmt.Sprintf("spec.containers[%d]", i), nil
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}
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return fmt.Sprintf("spec.containers{%s}", here.Name), nil
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}
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}
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for i := range pod.Spec.InitContainers {
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here := &pod.Spec.InitContainers[i]
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if here.Name == container.Name {
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if here.Name == "" {
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return fmt.Sprintf("spec.initContainers[%d]", i), nil
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}
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return fmt.Sprintf("spec.initContainers{%s}", here.Name), nil
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}
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}
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if utilfeature.DefaultFeatureGate.Enabled(features.EphemeralContainers) {
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for i := range pod.Spec.EphemeralContainers {
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here := &pod.Spec.EphemeralContainers[i]
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if here.Name == container.Name {
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if here.Name == "" {
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return fmt.Sprintf("spec.ephemeralContainers[%d]", i), nil
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}
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return fmt.Sprintf("spec.ephemeralContainers{%s}", here.Name), nil
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}
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}
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}
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return "", fmt.Errorf("container %q not found in pod %s/%s", container.Name, pod.Namespace, pod.Name)
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}
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