mirror of
https://github.com/kubesphere/kubekey.git
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85 lines
2.7 KiB
Go
85 lines
2.7 KiB
Go
/*
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Copyright 2021 The KubeSphere 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 containerruntime
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import (
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"github.com/pkg/errors"
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"os"
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"strings"
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)
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const (
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dockerSocket = "/var/run/docker.sock" // The Docker socket is not CRI compatible
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DefaultDockerCRISocket = "/var/run/dockershim.sock"
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containerdSocket = "/run/containerd/containerd.sock"
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)
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// isExistingSocket checks if path exists and is domain socket
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func isExistingSocket(path string) bool {
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fileInfo, err := os.Stat(path)
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if err != nil {
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return false
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}
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return fileInfo.Mode()&os.ModeSocket != 0
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}
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// detectCRISocketImpl is separated out only for test purposes, DON'T call it directly, use DetectCRISocket instead
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func detectCRISocketImpl(isSocket func(string) bool) (string, error) {
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foundCRISockets := []string{}
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knownCRISockets := []string{
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// Docker and containerd sockets are special cased below, hence not to be included here
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"/var/run/crio/crio.sock",
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}
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if isSocket(dockerSocket) {
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}
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if isSocket(containerdSocket) {
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// Docker 18.09 gets bundled together with containerd, thus having both dockerSocket and containerdSocket present.
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// Docker will be deprecated, so prefer to use containerd.
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foundCRISockets = append(foundCRISockets, containerdSocket)
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} else if isSocket(dockerSocket) {
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// the path in dockerSocket is not CRI compatible, hence we should replace it with a CRI compatible socket
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foundCRISockets = append(foundCRISockets, DefaultDockerCRISocket)
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}
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for _, socket := range knownCRISockets {
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if isSocket(socket) {
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foundCRISockets = append(foundCRISockets, socket)
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}
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}
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switch len(foundCRISockets) {
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case 0:
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// Fall back to Docker if no CRI is detected, we can error out later on if we need it
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return DefaultDockerCRISocket, nil
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case 1:
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// Precisely one CRI found, use that
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return foundCRISockets[0], nil
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default:
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// Multiple CRIs installed?
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return "", errors.Errorf("Found multiple CRI sockets, please use --cri-socket to select one: %s", strings.Join(foundCRISockets, ", "))
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}
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}
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// DetectCRISocket uses a list of known CRI sockets to detect one. If more than one or none is discovered, an error is returned.
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func DetectCRISocket() (string, error) {
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return detectCRISocketImpl(isExistingSocket)
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}
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