GoogleContainerTools/skaffold · error

strings.Join(messages, " \n ")

Error message

strings.Join(messages, " \n ")

What it means

ProcessWithRunContext validates a config that requires a RunContext; all collected errors are joined with ' \n ' into one error. It is the run-context-aware counterpart of Process and fires when validation finds problems in that mode.

Source

Thrown at pkg/skaffold/schema/validation/validation.go:136

// 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
	}
	var messages []string
	for _, err := range errs {
		messages = append(messages, err.Error())
	}
	return errors.New(strings.Join(messages, " \n "))
}

// validateTaggingPolicy checks that the tagging policy is valid in combination with other options.
func validateTaggingPolicy(cfg *parser.SkaffoldConfigEntry, bc latest.BuildConfig) (cfgErrs []ErrorWithLocation) {
	if bc.LocalBuild != nil {
		// sha256 just uses `latest` tag, so tryImportMissing will virtually always succeed (#4889)
		if bc.LocalBuild.TryImportMissing && bc.TagPolicy.ShaTagger != nil {
			cfgErrs = append(cfgErrs, ErrorWithLocation{
				Error:    errors.New("tagging policy 'sha256' can not be used when 'tryImportMissing' is enabled"),
				Location: cfg.YAMLInfos.Locate(cfg.Build.TagPolicy.ShaTagger),
			})
		}
	}
	return
}

// validateImageNames makes sure the artifact image names are unique and valid base names,
// without tags nor digests.

View on GitHub (pinned to a1189de023)

Solutions

1. Parse the ' \n '-separated messages and fix each underlying config issue.
2. Validate the config first with Process/`skaffold fix` to surface and fix issues early.
3. Ensure the required RunContext inputs are correct so run-context-specific checks pass.

Example fix

// before
err := validation.ProcessWithRunContext(ctx, cfg) // joined ' \n ' errors
// after
if err := validation.Process(cfg); err != nil {
    for _, msg := range strings.Split(err.Error(), " \n ") {
        log.Println(msg) // address each issue
    }
}

if err := validation.Process(cfg); err != nil { return err } // catch plain validation issues before run-context validation

null

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

When it happens

Trigger: Calling ProcessWithRunContext (via runContext) on a config whose validation yields errors while a RunContext is required.

Common situations: Commands that need a run context (e.g. render/deploy flows) hitting invalid skaffold.yaml content.

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")
• cannot add an empty image value
• response must be a number, or empty
• tagging policy 'sha256' can not be used when 'tryImportMissi
• INIT_DOCKER_NETWORK_INVALID_MODE

AI-assisted analysis of GoogleContainerTools/skaffold@a1189de023 (2026-09-05). Data as JSON: /api/errors/9d540026164edb2f. Report an issue: GitHub.