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kubectl.go
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kubectl.go
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package binaries
import (
"fmt"
"io/fs"
"os"
"os/exec"
"path/filepath"
"regexp"
"sort"
"strconv"
"strings"
"github.com/blang/semver"
"github.com/pkg/errors"
"github.com/replicatedhq/kots/pkg/logger"
)
var (
knownKubectlVersions kubectlVersions
)
// InitKubectl will discover kubectl versions from the environment and populate a list of known
// kubectl versions for later use.
func InitKubectl() (err error) {
knownKubectlVersions, err = discoverKubectlVersions(os.DirFS("/"))
if err != nil {
return errors.Wrap(err, "discover kubectl versions")
}
logger.Infof("Found kubectl binary versions %s", knownKubectlVersions)
return nil
}
// GetKubectlPathForVersion gets the path to a known kubectl version that matches the provided
// semver or semver range.
func GetKubectlPathForVersion(userString string) (string, error) {
for _, knownVersion := range knownKubectlVersions {
if knownVersion.Match(userString) {
return knownVersion.Path, nil
}
}
return "", errors.New("kubectl binary not found")
}
type kubectlVersions []kubectlFuzzyVersion
func (a kubectlVersions) Len() int {
return len(a)
}
func (a kubectlVersions) Less(i, j int) bool {
return a[i].Version.GT(a[j].Version) // sort in descending order
}
func (a kubectlVersions) Swap(i, j int) {
a[i], a[j] = a[j], a[i]
}
type kubectlFuzzyVersion struct {
Version semver.Version
Path string
}
func newKubectlFuzzyVersion(major, minor uint64, path string) kubectlFuzzyVersion {
return kubectlFuzzyVersion{
Version: semver.Version{
Major: major,
Minor: minor,
Patch: 0,
},
Path: path,
}
}
func (v kubectlFuzzyVersion) String() string {
if v.Version.Equals(semver.Version{}) {
return ""
}
return fmt.Sprintf("v%d.%d", v.Version.Major, v.Version.Minor)
}
func (v kubectlFuzzyVersion) Match(userString string) bool {
if v.Version.Equals(semver.Version{}) {
return true // catch all
}
if userString == "" || userString == "latest" {
return false
}
// match non-semver format 1.17 or v1.17
if userString == v.String() || userString == strings.TrimLeft(v.String(), "v") {
return true
}
// ignore error here as this could be a semver range
if exactVer, err := semver.Parse(userString); err == nil {
// fuzzy match major and minor, not patch
return exactVer.Major == v.Version.Major && exactVer.Minor == v.Version.Minor
}
rangeVer, err := semver.ParseRange(userString)
if err != nil {
return false
}
return rangeVer(v.Version)
}
func discoverKubectlVersions(fileSystem fs.FS) ([]kubectlFuzzyVersion, error) {
if binDirPath := os.Getenv("KOTS_KUBECTL_BIN_DIR"); binDirPath != "" {
versions, err := discoverKubectlVersionsFromDir(fileSystem, binDirPath)
return versions, errors.Wrap(err, "discover kubectl versions from dir")
}
versions, err := discoverKubectlVersionsFromPath(fileSystem)
return versions, errors.Wrap(err, "discover kubectl versions from path")
}
var kubectlVerRegexp = regexp.MustCompile(`^kubectl(-v(\d+)\.(\d+))?$`)
func discoverKubectlVersionsFromDir(fileSystem fs.FS, dirPath string) ([]kubectlFuzzyVersion, error) {
versions := []kubectlFuzzyVersion{}
entries, err := fs.ReadDir(fileSystem, strings.TrimLeft(dirPath, "/"))
if err != nil {
return versions, errors.Wrap(err, "read dir")
}
for _, entry := range entries {
matches := kubectlVerRegexp.FindStringSubmatch(entry.Name())
if len(matches) > 0 {
var major, minor uint64
// default version has no version suffix
if matches[2] != "" && matches[3] != "" {
var err error
major, err = strconv.ParseUint(matches[2], 10, 64)
if err != nil {
continue
}
minor, err = strconv.ParseUint(matches[3], 10, 64)
if err != nil {
continue
}
}
versions = append(versions, newKubectlFuzzyVersion(major, minor, filepath.Join(dirPath, entry.Name())))
}
}
sort.Sort(kubectlVersions(versions))
return versions, nil
}
func discoverKubectlVersionsFromPath(fileSystem fs.FS) ([]kubectlFuzzyVersion, error) {
// NOTE: exec.LookPath does not yet support io/fs
binPath, err := exec.LookPath("kubectl")
if err != nil {
return nil, errors.Wrap(err, "look path")
}
return []kubectlFuzzyVersion{newKubectlFuzzyVersion(0, 0, binPath)}, nil
}