| /* |
| Copyright 2017 The Kubernetes 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 preflight |
| |
| import ( |
| "regexp" |
| "strings" |
| |
| "github.com/pkg/errors" |
| |
| "k8s.io/apimachinery/pkg/util/version" |
| utilsexec "k8s.io/utils/exec" |
| ) |
| |
| // GetKubeletVersion is helper function that returns version of kubelet available in $PATH |
| func GetKubeletVersion(execer utilsexec.Interface) (*version.Version, error) { |
| kubeletVersionRegex := regexp.MustCompile(`^\s*Kubernetes v((0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)([-0-9a-zA-Z_\.+]*)?)\s*$`) |
| |
| command := execer.Command("kubelet", "--version") |
| out, err := command.CombinedOutput() |
| if err != nil { |
| return nil, err |
| } |
| |
| cleanOutput := strings.TrimSpace(string(out)) |
| subs := kubeletVersionRegex.FindAllStringSubmatch(cleanOutput, -1) |
| if len(subs) != 1 || len(subs[0]) < 2 { |
| return nil, errors.Errorf("Unable to parse output from Kubelet: %q", cleanOutput) |
| } |
| return version.ParseSemantic(subs[0][1]) |
| } |