90 lines
2.7 KiB
Go
90 lines
2.7 KiB
Go
/*
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Copyright 2018 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 images
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import (
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"fmt"
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kubeadmapiv1alpha3 "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1alpha3"
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utilsexec "k8s.io/utils/exec"
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)
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// Puller is an interface for pulling images
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type Puller interface {
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Pull(string) error
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}
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// Existence is an interface to determine if an image exists on the system
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// A nil error means the image was found
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type Existence interface {
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Exists(string) error
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}
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// Images defines the set of behaviors needed for images relating to the CRI
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type Images interface {
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Puller
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Existence
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}
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// CRInterfacer is a struct that interfaces with the container runtime
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type CRInterfacer struct {
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criSocket string
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exec utilsexec.Interface
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crictlPath string
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dockerPath string
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}
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// NewCRInterfacer sets up and returns a CRInterfacer
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func NewCRInterfacer(execer utilsexec.Interface, criSocket string) (*CRInterfacer, error) {
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var crictlPath, dockerPath string
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var err error
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if criSocket != kubeadmapiv1alpha3.DefaultCRISocket {
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if crictlPath, err = execer.LookPath("crictl"); err != nil {
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return nil, fmt.Errorf("crictl is required for non docker container runtimes: %v", err)
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}
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} else {
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// use the dockershim
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if dockerPath, err = execer.LookPath("docker"); err != nil {
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return nil, fmt.Errorf("`docker` is required when docker is the container runtime and the kubelet is not running: %v", err)
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}
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}
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return &CRInterfacer{
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exec: execer,
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criSocket: criSocket,
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crictlPath: crictlPath,
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dockerPath: dockerPath,
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}, nil
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}
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// Pull pulls the actual image using either crictl or docker
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func (cri *CRInterfacer) Pull(image string) error {
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if cri.criSocket != kubeadmapiv1alpha3.DefaultCRISocket {
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return cri.exec.Command(cri.crictlPath, "-r", cri.criSocket, "pull", image).Run()
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}
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return cri.exec.Command(cri.dockerPath, "pull", image).Run()
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}
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// Exists checks to see if the image exists on the system already
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// Returns an error if the image is not found.
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func (cri *CRInterfacer) Exists(image string) error {
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if cri.criSocket != kubeadmapiv1alpha3.DefaultCRISocket {
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return cri.exec.Command(cri.crictlPath, "-r", cri.criSocket, "inspecti", image).Run()
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}
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return cri.exec.Command(cri.dockerPath, "inspect", image).Run()
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}
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