GoogleContainerTools/skaffold · error

strings.Join(messages, "\n")

Error message

strings.Join(messages, "\n")

What it means

Process collects all validation errors for a skaffold config; if any were recorded it joins their messages with newline and returns a single aggregated error. This is the aggregate message developers see when their skaffold.yaml fails validation.

Source

Thrown at pkg/skaffold/schema/validation/validation.go:112

	}
	if len(errs) == 0 {
		return nil
	}
	return errs
}

// Process checks if the Skaffold pipeline is valid and returns all encountered errors as a concatenated string
func Process(configs parser.SkaffoldConfigSet, validateConfig Options) error {
	errs := ProcessToErrorWithLocation(configs, validateConfig)
	for _, config := range configs {
		errs = append(errs, wrapWithContext(config, errs...)...)
	}
	var messages []string
	for _, err := range errs {
		messages = append(messages, err.Error.Error())
	}
	if len(messages) != 0 {
		return errors.New(strings.Join(messages, "\n"))
	}
	return nil
}

// ProcessWithRunContext checks if the Skaffold pipeline is valid when a RunContext is required.
// It returns all encountered errors as a concatenated string.
func ProcessWithRunContext(ctx context.Context, runCtx *runcontext.RunContext) error {
	var errs []error
	errs = append(errs, validateDockerNetworkContainerExists(ctx, runCtx.Artifacts(), runCtx)...)
	errs = append(errs, validateVerifyTestsExistOnVerifyCommand(runCtx)...)
	errs = append(errs, validateVerifyTests(runCtx)...)
	errs = append(errs, validateLocationSetForCloudRun(runCtx)...)
	errs = append(errs, validateCustomActionsLists(runCtx)...)
	errs = append(errs, validateCustomActionsNames(runCtx)...)
	errs = append(errs, validateCustomActionsExecModes(runCtx)...)

	if len(errs) == 0 {
		return nil

View on GitHub (pinned to a1189de023)

Solutions

1. Read each newline-separated line of the error; each is an individual validation failure.
2. Fix the listed config problems in skaffold.yaml and rerun.
3. Run with more verbose output / use skaffold commands that point to config locations to find the offending lines.

Example fix

// before
// multi-line error: several validation problems at once
// after
// fix each reported line, e.g. remove the invalid tagger, then rerun until Process returns nil

// pre-validate locally
if err := yaml.Unmarshal(cfgBytes, &latest.SkaffoldConfig{}); err != nil { /* fix parse errors first */ }

null

if err := validation.Process(cfg); err != nil {
    for _, msg := range strings.Split(err.Error(), "\n") {
        log.Printf("config issue: %s", msg)
    }
}

When it happens

Trigger: Calling validation.Process (directly or via fix/runContext/checkSkaffoldConfig) on a skaffold config that has one or more validation errors.

Common situations: Invalid skaffold.yaml values (bad taggers, missing fields, incompatible options) surfaced when running skaffold commands.

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

• strings.Join(messages, " \n ")
• validating upgraded config: %w
• invalid skaffold config: %w
• %s is not a valid URL
• duplicate image %q found in sources %s and %s: artifact imag

AI-assisted analysis of GoogleContainerTools/skaffold@a1189de023 (2026-09-05). Data as JSON: /api/errors/22a8dac9952ad7ac. Report an issue: GitHub.