7ecab96dcd
This command will use crictl or docker to pull images locally. The dockerfall back is needed because in some cases the kubelet is not yet running so there is no CRI dockershim socket available. Fixes kubernetes/kubeadm#812 Signed-off-by: Chuck Ha <ha.chuck@gmail.com>
58 lines
1.8 KiB
Go
58 lines
1.8 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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kubeadmapiv1alpha1 "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1alpha1"
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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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// ImagePuller is a struct that can pull images and hides the implementation (crictl vs docker)
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type ImagePuller struct {
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criSocket string
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exec utilsexec.Interface
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crictlPath string
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}
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// NewImagePuller returns a ready to go ImagePuller
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func NewImagePuller(execer utilsexec.Interface, criSocket string) (*ImagePuller, error) {
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crictlPath, err := execer.LookPath("crictl")
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if err != nil && criSocket != kubeadmapiv1alpha1.DefaultCRISocket {
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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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return &ImagePuller{
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exec: execer,
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criSocket: criSocket,
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crictlPath: crictlPath,
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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 (ip *ImagePuller) Pull(image string) error {
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if ip.criSocket != kubeadmapiv1alpha1.DefaultCRISocket {
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return ip.exec.Command(ip.crictlPath, "-r", ip.criSocket, "pull", image).Run()
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}
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return ip.exec.Command("sh", "-c", fmt.Sprintf("docker pull %v", image)).Run()
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}
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