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check.go
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check.go
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package check
import (
"fmt"
"os/exec"
"strings"
"github.com/Masterminds/semver/v3"
)
const (
kubernetesConstraints = ">=1.20.6-0"
)
// Pre runs pre-install checks
func Pre() (string, error) {
k8sOutput, err := runKubernetesCheck()
if err != nil {
return "", err
}
return k8sOutput, nil
}
func runKubernetesCheck() (string, error) {
versionOutput, err := exec.Command("kubectl", "version", "--short").CombinedOutput()
if err != nil {
return "", fmt.Errorf("unable to get kubernetes version: %w", err)
}
v, err := parseVersion(string(versionOutput))
if err != nil {
return "", fmt.Errorf("kubernetes version can't be determined: %w", err)
}
return checkKubernetesVersion(v)
}
func checkKubernetesVersion(version *semver.Version) (string, error) {
var valid bool
var vrange string
c, _ := semver.NewConstraint(kubernetesConstraints)
if c.Check(version) {
valid = true
vrange = kubernetesConstraints
}
if !valid {
return "", fmt.Errorf("✗ kubernetes version %s does not match %s", version.Original(), kubernetesConstraints)
}
return fmt.Sprintf("✔ Kubernetes %s %s", version.String(), vrange), nil
}
func parseVersion(text string) (*semver.Version, error) {
version := ""
lines := strings.Split(text, "\n")
for _, line := range lines {
if strings.Contains(line, "Server") {
version = strings.Replace(line, "Server Version: v", "", 1)
}
}
if _, err := semver.StrictNewVersion(version); err != nil {
return nil, err
}
return semver.NewVersion(version)
}