mirror of https://github.com/k3s-io/k3s
55 lines
2.1 KiB
Go
55 lines
2.1 KiB
Go
/*
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Copyright 2021 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 version
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import (
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"fmt"
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"io"
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"k8s.io/apimachinery/pkg/util/version"
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apimachineryversion "k8s.io/apimachinery/pkg/version"
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"math"
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)
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// supportedMinorVersionSkew is the maximum supported difference between the client and server minor versions.
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// For example: client versions 1.18, 1.19, and 1.20 would be within the supported version skew for server version 1.19,
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// and server versions 1.18, 1.19, and 1.20 would be within the supported version skew for client version 1.19.
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const supportedMinorVersionSkew = 1
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// printVersionSkewWarning prints a warning message if the difference between the client and version is greater than
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// the supported version skew.
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func printVersionSkewWarning(w io.Writer, clientVersion, serverVersion apimachineryversion.Info) error {
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parsedClientVersion, err := version.ParseSemantic(clientVersion.GitVersion)
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if err != nil {
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return err
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}
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parsedServerVersion, err := version.ParseSemantic(serverVersion.GitVersion)
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if err != nil {
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return err
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}
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majorVersionDifference := math.Abs(float64(parsedClientVersion.Major()) - float64(parsedServerVersion.Major()))
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minorVersionDifference := math.Abs(float64(parsedClientVersion.Minor()) - float64(parsedServerVersion.Minor()))
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if majorVersionDifference > 0 || minorVersionDifference > supportedMinorVersionSkew {
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fmt.Fprintf(w, "WARNING: version difference between client (%d.%d) and server (%d.%d) exceeds the supported minor version skew of +/-%d\n",
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parsedClientVersion.Major(), parsedClientVersion.Minor(), parsedServerVersion.Major(), parsedServerVersion.Minor(), supportedMinorVersionSkew)
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}
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return nil
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}
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