GoogleContainerTools/skaffold · error

validating upgraded config: %w

Error message

validating upgraded config: %w

What it means

The `skaffold fix` command upgrades an old skaffold.yaml to a newer schema version. After rewriting the config, it runs skaffold's own validation engine (`validation.Process`) over the upgraded configs; if any rule fails, this wrapper attaches the validation report to the message 'validating upgraded config'. It means the upgrade produced a config that parses but violates schema/semantic rules, so fix refuses to emit it.

Source

Thrown at cmd/skaffold/app/cmd/fix.go:114

	}

	// TODO(dgageot): We should be able run validations on any schema version
	// but that's not the case. They can only run on the latest version for now.
	if toVersion == latest.Version {
		var cfgs parser.SkaffoldConfigSet
		for _, cfg := range upgraded {
			cpCfg := latest.NewSkaffoldConfig()
			if err = util2.DeepCopy(cpCfg, cfg); err != nil {
				cpCfg = cfg
			}
			defaults.Set(cpCfg.(*latest.SkaffoldConfig))
			cfgs = append(cfgs, &parser.SkaffoldConfigEntry{
				SkaffoldConfig: cpCfg.(*latest.SkaffoldConfig),
				SourceFile:     configFile,
				IsRootConfig:   true})
		}
		if err := validation.Process(cfgs, validation.GetValidationOpts(opts)); err != nil {
			return fmt.Errorf("validating upgraded config: %w", err)
		}
	}
	newCfg, err := yaml.MarshalWithSeparator(upgraded)
	if err != nil {
		return fmt.Errorf("marshaling new config: %w", err)
	}
	if outFile != "" {
		var writeErr error
		if overwrite {
			oldCfg, readErr := os.ReadFile(configFile)
			if readErr != nil {
				return fmt.Errorf("reading config file: %w", readErr)
			}
			newFile := fmt.Sprintf("%s.v2", outFile)

			writeErr = os.WriteFile(newFile, oldCfg, 0644)
			if writeErr == nil {
				output.Default.Fprintln(out, "Backed up previous skaffold.yaml at ", newFile)

View on GitHub (pinned to a1189de023)

Solutions

1. Read the wrapped validation error output — it lists the exact failing paths/fields in the upgraded config.
2. Fix the offending fields in the source skaffold.yaml and re-run `skaffold fix`.
3. Run `skaffold fix --overwrite=false` and inspect the proposed output instead of overwriting directly.
4. Try upgrading one version at a time (fix with `--to-version`) rather than jumping multiple schema versions.

Example fix

// before: v1 config with a field that no longer validates after upgrade
build:
  tagPolicy: sha256
// after: corrected field for the target schema
build:
  tagPolicy:
    sha256: {}

// Before relying on `skaffold fix` output, validate the source config
const out = execFileSync('skaffold', ['fix', '--output', '/tmp/fixed.yaml', '-f', 'skaffold.yaml']);
const diag = execFileSync('skaffold', ['diagnose', '-f', '/tmp/fixed.yaml'], {encoding: 'utf8'});
if (diag.includes('Error') || diag.includes('invalid')) throw new Error('upgraded config failed validation; inspect /tmp/fixed.yaml');

try {
  execFileSync('skaffold', ['fix', '--overwrite', '-f', 'skaffold.yaml'], {stdio: 'pipe'});
} catch (e) {
  const msg = e.stderr?.toString() ?? '';
  if (msg.includes('validating upgraded config')) {
    console.error('Upgrade produced an invalid config:', msg);
    // fall back to manual config edit
  } else throw e;
}

When it happens

Trigger: Running `skaffold fix` (or `skaffold fix --overwrite`) on a v1/v2 skaffold.yaml where the upgraded config fails validation.Process — e.g. an artifact references an unknown build type, required fields were dropped during upgrade, or profiles contain invalid fields.

Common situations: Upgrading configs from very old skaffold versions whose fields have no direct mapping to the target version; hand-edited configs with subtle schema mistakes; upgrading across multiple major schema versions at once.

Understand the failure class

Background: Schema validation failed / invalid input schema: payload rejected because its shape doesn't match the expected schema — this error's family across 28 libraries.

Related errors

• invalid skaffold config: %w
• marshaling new config: %w
• parsing skaffold config: %w
• cannot add an empty image value
• INSPECT_PROFILE_NOT_FOUND_ERR

AI-assisted analysis of GoogleContainerTools/skaffold@a1189de023 (2026-09-05). Data as JSON: /api/errors/645b817183088ecc. Report an issue: GitHub.