What causes "unknown phase %v not found in handler state" in GoogleContainerTools/skaffold?

Use only the supported phase names: "build", "sync", or "deploy"

unknown phase %v not found in handler state

Error message

unknown phase %v not found in handler state

What it means

AutoTriggerDiff computes whether an auto-trigger setting changed for a given phase (build/sync/deploy). If the phase name argument is anything other than those three, it returns 'unknown phase %v not found in handler state'. This is an internal invariant violation: the caller passed an unsupported phase identifier.

Source

Thrown at pkg/skaffold/event/event.go:808

func emptyStatusCheckState() *proto.StatusCheckState {
	return &proto.StatusCheckState{
		Status:     NotStarted,
		Resources:  map[string]string{},
		StatusCode: proto.StatusCode_OK,
	}
}

func AutoTriggerDiff(name string, val bool) (bool, error) {
	switch name {
	case "build":
		return val != handler.getState().BuildState.AutoTrigger, nil
	case "sync":
		return val != handler.getState().FileSyncState.AutoTrigger, nil
	case "deploy":
		return val != handler.getState().DeployState.AutoTrigger, nil
	default:
		return false, fmt.Errorf("unknown phase %v not found in handler state", name)
	}
}

// BuildSequenceFailed notifies that the build sequence has failed.
func BuildSequenceFailed(err error) {
	aiErr := sErrors.ActionableErr(handler.cfg, constants.Build, err)
	handler.stateLock.Lock()
	handler.state.BuildState.StatusCode = aiErr.ErrCode
	handler.stateLock.Unlock()
}

func InititializationFailed(err error) {
	handler.handle(&proto.Event{
		EventType: &proto.Event_TerminationEvent{
			TerminationEvent: &proto.TerminationEvent{
				Status: Failed,
				Err:    sErrors.ActionableErr(handler.cfg, constants.Init, err),
			},

View on GitHub (pinned to a1189de023)

Solutions

Use only the supported phase names: "build", "sync", or "deploy"
If adding a new phase in a fork, extend the switch in AutoTriggerDiff (and the corresponding handler state) to cover it
Check upstream skaffold for updates if a new phase was introduced and this branch is stale

Example fix

// before
AutoTriggerDiff(cfg, "deployStatus", val)
// after
AutoTriggerDiff(cfg, "deploy", val)

Defensive patterns

Strategy: validation

Validate before calling

var validPhases = map[string]bool{"build": true, "sync": true, "deploy": true}
if !validPhases[phase] {
    return fmt.Errorf("unsupported phase %q for AutoTriggerDiff", phase)
}

Type guard

func isKnownPhase(name string) bool {
    switch name {
    case "build", "sync", "deploy":
        return true
    }
    return false
}

Try / catch

if diff, err := AutoTriggerDiff(cfg, phase, val); err != nil {
    if strings.Contains(err.Error(), "unknown phase") {
        log.Debugf("no auto-trigger diff for phase %q", phase)
        return nil
    }
    return err
}

Prevention

Only pass the build, sync, or deploy phase identifiers
Add unit tests covering every phase name routed to AutoTriggerDiff
When adding a new phase, update AutoTriggerDiff in the same change
Use a typed phase enum instead of raw strings in forks

When it happens

Trigger: executeAutoTrigger calls AutoTriggerDiff with a phase string not in {"build","sync","deploy"} — typically after adding a new phase to the state handler without updating this switch.

Common situations: Skaffold source modification adding a new pipeline phase; plugin or fork code calling AutoTriggerDiff with a custom phase name; typo in a phase constant passed through.

Understand the failure class

Background: Invalid enum value errors: "Unknown type", "Invalid scope", "must be one of" — when a string is not on the library's allowed list — this error's family across 23 libraries.

AI-assisted analysis of GoogleContainerTools/skaffold@a1189de023 (2026-09-05). Data as JSON: /api/errors/1ae51d79ac33b426. Report an issue: GitHub.