kubernetes/kops · error

invalid channel location: %q

Error message

invalid channel location: %q

What it means

ResolveChannel in pkg/apis/kops/channel.go loads a kops channel (addons/Kubernetes update channel) from a location string. The string 'none' is special-cased to a nil channel; otherwise the location is parsed as a URL, and if url.Parse fails, the location is rejected with 'invalid channel location'. Relative locations are later resolved against DefaultChannelBase.

Source

Thrown at pkg/apis/kops/channel.go:115

	Version string `json:"version"`

	// KubernetesVersion specifies that this package only applies to a semver range of kubernetes version
	KubernetesVersion string `json:"kubernetesVersion,omitempty"`

	// KopsVersion specifies that this package only applies to a semver range of kOps version
	KopsVersion string `json:"kopsVersion,omitempty"`
}

// ResolveChannel maps a channel to an absolute URL (possibly a VFS URL)
// If the channel is the well-known "none" value, we return (nil, nil)
func ResolveChannel(location string) (*url.URL, error) {
	if location == "none" {
		return nil, nil
	}

	u, err := url.Parse(location)
	if err != nil {
		return nil, fmt.Errorf("invalid channel location: %q", location)
	}

	if !u.IsAbs() {
		base, err := url.Parse(DefaultChannelBase)
		if err != nil {
			return nil, fmt.Errorf("invalid base channel location: %q", DefaultChannelBase)
		}
		klog.V(4).Infof("resolving %q against default channel location %q", location, DefaultChannelBase)
		u = base.ResolveReference(u)
	}

	return u, nil
}

// LoadChannel loads a Channel object from the specified VFS location
func LoadChannel(vfsContext *vfs.VFSContext, location string) (*Channel, error) {
	resolvedURL, err := ResolveChannel(location)
	if err != nil {

View on GitHub (pinned to 4c8573c808)

Solutions

1. Fix the channel location in the cluster spec/addons so it is a valid absolute URL (https:// or file://) or the literal string 'none' to disable.
2. URL-encode special characters (spaces, braces) or remove them: e.g. 'https://example.com/my channel.yaml' → 'https://example.com/my%20channel.yaml'.
3. Trim stray whitespace/newlines around the location value (inspect with `kops get cluster -o yaml`).
4. Omit relative-path confusion: use the default base implicitly by giving a bare filename only if intended, or provide a full https URL.

Example fix

// before: invalid URL (unencoded space)
channel: https://example.com/channels/my channel.yaml
// after
currentChannel: https://example.com/channels/my-channel.yaml

u, err := url.Parse(location)
if err != nil {
	return fmt.Errorf("channel location %q is not a valid URL: %v", location, err)
}
if location != "none" && u.Host == "" && u.Scheme == "" {
	// will be resolved against DefaultChannelBase; ensure it is a clean relative path
}

func isValidChannelLocation(loc string) bool {
	if loc == "none" {
		return true
	}
	_, err := url.Parse(loc)
	return err == nil && loc != ""
}

channel, err := channel.ResolveChannel(location, nil)
if err != nil {
	if strings.Contains(err.Error(), "invalid channel location") {
		return fmt.Errorf("check 'channel' value in cluster spec: %q must be a valid URL or 'none' (%v)", location, err)
	}
	return err
}

When it happens

Trigger: LoadChannel or loadClusterPackage is given a channel location string that is not a parseable URL and is not the literal 'none' — e.g. contains characters illegal in a URL (spaces, unescaped braces, control characters) or a malformed scheme.

Common situations: Typo in the cluster spec's channel/addons location (unescaped spaces in a file:// or https:// URL); templated config where a variable expanded to something with special characters; copy-pasted location with trailing whitespace or newline; confusion between 'none' and other disable markers like 'disabled'.

Related errors

• invalid base channel location: %q
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• unable to parse configuration server url %q: %w
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AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/42baa7fddd4b3984. Report an issue: GitHub.