Method DiffRelease

pkg/helmexec/exec.go:805–848

(context HelmContext, name, chart, namespace string, suppressDiff bool, flags ...string)

}

func (helm *execer) DiffRelease(context HelmContext, name, chart, namespace string, suppressDiff bool, flags ...string) error {
	diffMsg := fmt.Sprintf("Comparing release=%v, chart=%v, namespace=%v\n", name, redactedURL(chart), namespace)
	if context.Writer != nil && !suppressDiff {
		_, _ = fmt.Fprint(context.Writer, diffMsg)
	} else {
		helm.logger.Info(diffMsg)
	}
	preArgs := make([]string, 0)
	env := make(map[string]string)
	var overrideEnableLiveOutput *bool = nil
	if suppressDiff {
		enableLiveOutput := false
		overrideEnableLiveOutput = &enableLiveOutput
	}

	// Issue #2280: In Helm 4, the --color flag is parsed by Helm before reaching the plugin,
	// causing it to consume the next argument. Remove color flags and use HELM_DIFF_COLOR env var.
	if helm.IsHelm4() {
		flags = helm.filterColorFlagsForHelm4(flags, env)
	}

	out, err := helm.exec(append(append(preArgs, "diff", "upgrade", "--allow-unreleased", name, chart), flags...), env, overrideEnableLiveOutput)
	// Do our best to write STDOUT only when diff existed
	// Unfortunately, this works only when you run helmfile with `--detailed-exitcode`
	detailedExitcodeEnabled := false
	for _, f := range flags {
		if strings.Contains(f, "detailed-exitcode") {
			detailedExitcodeEnabled = true
			break
		}
	}
	if detailedExitcodeEnabled {
		e, ok := err.(ExitError)
		if ok && e.ExitStatus() == 2 {
			if !(suppressDiff) {
				helm.write(context.Writer, out)
			}
			return err
		}
	} else if !(suppressDiff) {
		helm.write(context.Writer, out)
	}
	return err
}

// filterColorFlagsForHelm4 removes --color and --no-color flags from the flags slice
// and sets the HELM_DIFF_COLOR environment variable instead.