mirror of https://github.com/knative/caching.git
73 lines
2.1 KiB
Go
73 lines
2.1 KiB
Go
/*
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Copyright 2019 The Knative 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 version
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import (
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"fmt"
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"os"
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"github.com/rogpeppe/go-internal/semver"
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"k8s.io/apimachinery/pkg/version"
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)
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// ServerVersioner is an interface to mock the `ServerVersion`
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// method of the Kubernetes client's Discovery interface.
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// In an application `kubeClient.Discovery()` can be used to
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// suffice this interface.
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type ServerVersioner interface {
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ServerVersion() (*version.Info, error)
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}
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const (
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// KubernetesMinVersionKey is the environment variable that can be used to override
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// the Kubernetes minimum version required by Knative.
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KubernetesMinVersionKey = "KUBERNETES_MIN_VERSION"
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defaultMinimumVersion = "v1.14.0"
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)
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func getMinimumVersion() string {
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if v := os.Getenv(KubernetesMinVersionKey); v != "" {
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return v
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}
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return defaultMinimumVersion
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}
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// CheckMinimumVersion checks if the currently installed version of
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// Kubernetes is compatible with the minimum version required.
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// Returns an error if its not.
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//
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// A Kubernetes discovery client can be passed in as the versioner
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// like `CheckMinimumVersion(kubeClient.Discovery())`.
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func CheckMinimumVersion(versioner ServerVersioner) error {
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v, err := versioner.ServerVersion()
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if err != nil {
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return err
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}
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currentVersion := semver.Canonical(v.String())
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minimumVersion := getMinimumVersion()
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// Compare returns 1 if the first version is greater than the
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// second version.
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if semver.Compare(minimumVersion, currentVersion) == 1 {
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return fmt.Errorf("kubernetes version %q is not compatible, need at least %q (this can be overridden with the env var %q)",
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currentVersion, minimumVersion, KubernetesMinVersionKey)
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}
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return nil
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}
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