kubernetes/cmd/kubeadm/app/util/version.go

const getReleaseVersionTimeout …

var kubeReleaseBucketURL …

var kubeCIBucketURL …

var kubeReleaseRegex …

var kubeReleaseLabelRegex …

var kubeBucketPrefixes …

var KubernetesReleaseVersion …

// kubernetesReleaseVersionDefault is helper function that can fetch
// available version information from release servers based on
// label names, like "stable" or "latest".
//
// If argument is already semantic version string, it
// will return same string.
//
// In case of labels, it tries to fetch from release
// servers and then return actual semantic version.
//
// Available names on release servers:
//
//	stable      (latest stable release)
//	stable-1    (latest stable release in 1.x)
//	stable-1.0  (and similarly 1.1, 1.2, 1.3, ...)
//	latest      (latest release, including alpha/beta)
//	latest-1    (latest release in 1.x, including alpha/beta)
//	latest-1.0  (and similarly 1.1, 1.2, 1.3, ...)
func kubernetesReleaseVersionDefault(version string) (string, error) { … }

// kubernetesReleaseVersion is a helper function to fetch
// available version information. Used for testing to eliminate
// the need for internet calls.
func kubernetesReleaseVersion(version string, fetcher func(string, time.Duration) (string, error)) (string, error) { … }

// KubernetesVersionToImageTag is helper function that replaces all
// non-allowed symbols in tag strings with underscores.
// Image tag can only contain lowercase and uppercase letters, digits,
// underscores, periods and dashes.
// Current usage is for CI images where all of symbols except '+' are valid,
// but function is for generic usage where input can't be always pre-validated.
func KubernetesVersionToImageTag(version string) string { … }

// KubernetesIsCIVersion checks if user requested CI version
func KubernetesIsCIVersion(version string) bool { … }

// Internal helper: returns normalized build version (with "v" prefix if needed)
// If input doesn't match known version pattern, returns empty string.
func normalizedBuildVersion(version string) string { … }

// Internal helper: split version parts,
// Return base URL and cleaned-up version
func splitVersion(version string) (string, string, error) { … }

// Internal helper: return content of URL
func fetchFromURL(url string, timeout time.Duration) (string, error) { … }

// kubeadmVersion returns the version of the client without metadata.
func kubeadmVersion(info string) (string, error) { … }

// Validate if the remote version is one Minor release newer than the client version.
// This is done to conform with "stable-X" and only allow remote versions from
// the same Patch level release.
func validateStableVersion(remoteVersion, clientVersion string) (string, error) { … }