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version.go
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version.go
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// Copyright 2016-2019, Pulumi Corporation.
//
// 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 cluster
import (
"fmt"
"regexp"
"strconv"
"strings"
"k8s.io/apimachinery/pkg/version"
"k8s.io/client-go/discovery"
)
// ServerVersion captures k8s major.minor version in a parsed form
type ServerVersion struct {
Major, Minor int
}
func (v ServerVersion) String() string {
return fmt.Sprintf("%d.%d", v.Major, v.Minor)
}
// Compare returns -1/0/+1 iff v is less than / equal / greater than input version.
func (v ServerVersion) Compare(version ServerVersion) int {
a := v.Major
b := version.Major
if a == b {
a = v.Minor
b = version.Minor
}
var res int
if a > b {
res = 1
} else if a == b {
res = 0
} else {
res = -1
}
return res
}
// TryGetServerVersion attempts to retrieve the server version from k8s.
// Returns the configured default version in case this fails.
func TryGetServerVersion(cdi discovery.CachedDiscoveryInterface) ServerVersion {
defaultSV := ServerVersion{
Major: 1,
Minor: 14,
}
if sv, err := cdi.ServerVersion(); err == nil {
if v, err := parseVersion(sv); err == nil {
return v
}
return defaultSV
}
return defaultSV
}
// gitVersion captures k8s major.minor.patch version in a parsed form
type gitVersion struct {
Major, Minor, Patch int
}
func (gv gitVersion) String() string {
return fmt.Sprintf("%d.%d.%d", gv.Major, gv.Minor, gv.Patch)
}
func parseGitVersion(versionString string) (gitVersion, error) {
// Format v0.0.0(-master+$Format:%h$)
gitVersionRe := regexp.MustCompile(`v([0-9]+).([0-9]+).([0-9]+).*`)
parsedVersion := gitVersionRe.FindStringSubmatch(versionString)
if len(parsedVersion) != 4 {
err := fmt.Errorf("unable to parse git version %q", versionString)
return gitVersion{}, err
}
var gv gitVersion
var err error
gv.Major, err = strconv.Atoi(parsedVersion[1])
if err != nil {
return gitVersion{}, err
}
gv.Minor, err = strconv.Atoi(parsedVersion[2])
if err != nil {
return gitVersion{}, err
}
gv.Patch, err = strconv.Atoi(parsedVersion[3])
if err != nil {
return gitVersion{}, err
}
return gv, nil
}
// parseVersion parses version.Info into a serverVersion struct
func parseVersion(v *version.Info) (ServerVersion, error) {
fallbackToGitVersion := false
major, err := strconv.Atoi(v.Major)
if err != nil {
fallbackToGitVersion = true
}
// trim "+" in minor version (happened on GKE)
v.Minor = strings.TrimSuffix(v.Minor, "+")
minor, err := strconv.Atoi(v.Minor)
if err != nil {
fallbackToGitVersion = true
}
if fallbackToGitVersion {
gv, err := parseGitVersion(v.GitVersion)
if err != nil {
return ServerVersion{}, err
}
return ServerVersion{Major: gv.Major, Minor: gv.Minor}, nil
}
return ServerVersion{Major: major, Minor: minor}, nil
}