GoogleContainerTools/skaffold · warning

checking terminal colors: %w

Error message

checking terminal colors: %w

What it means

SupportsColor shells out to `tput colors` (via util.RunCmdOut) to detect how many colors the terminal supports; this error wraps any failure of that external command. It is thrown because the exec failed — typically tput/ncurses is not installed, TERM is unset/unknown, or the process is not attached to a TTY. Callers SetupColors and the anonymous runtime-config wrapper treat it as a color-detection failure, not a fatal problem in most flows.

Source

Thrown at pkg/skaffold/util/term/term.go:58

	if f, ok := w.(descriptor); ok {
		termFd := f.Fd()
		isTerm := term.IsTerminal(int(termFd))
		return termFd, isTerm
	}

	return 0, false
}

func SupportsColor(ctx context.Context) (bool, error) {
	if runtime.GOOS == constants.Windows {
		return true, nil
	}

	cmd := exec.Command("tput", "colors")
	res, err := util.RunCmdOut(ctx, cmd)
	if err != nil {
		return false, fmt.Errorf("checking terminal colors: %w", err)
	}

	numColors, err := strconv.Atoi(strings.TrimSpace(string(res)))
	if err != nil {
		return false, err
	}

	return numColors > 0, nil
}

func WaitForKeyPress() error {
	// use rawMode so that we can read without the user to hit enter key.
	previousState, err := term.MakeRaw(int(os.Stdin.Fd()))
	if err != nil {
		return err
	}
	defer term.Restore(int(os.Stdin.Fd()), previousState)

View on GitHub (pinned to a1189de023)

Solutions

1. Install ncurses/tput in the environment (e.g. `apk add ncurses` or `apt-get install ncurses-bin`).
2. Set a valid TERM variable (e.g. export TERM=xterm-256color).
3. Force color behavior explicitly with Skaffold's color config / flags so terminal probing is skipped.
4. Run from an interactive TTY or set the color scheme programmatically instead of relying on auto-detection.

Example fix

// before
export TERM=dumb   # tput colors fails with unknown terminal
// after
export TERM=xterm-256color   # or: apk add ncurses in the container image

// detect the environment before running skaffold
if _, err := exec.LookPath("tput"); err != nil || os.Getenv("TERM") == "" || os.Getenv("TERM") == "dumb" {
    os.Setenv("TERM", "xterm-256color")
}

colors, err := term.SupportsColor(ctx)
if err != nil {
    log.Entry(ctx).Warnf("color detection failed (%v), defaulting to plain output", err)
    colors = false // fall back to no-color / fixed palette
}

When it happens

Trigger: Running Skaffold in an environment where `tput colors` is unavailable or exits non-zero: tput/ncurses not installed, TERM unset or set to an unknown terminal type, or executing inside a non-interactive container/CI runner without a TTY.

Common situations: Minimal Docker containers (alpine/scratch-based images) lacking ncurses-bin; CI systems (Jenkins, some GitLab runners) with TERM=dumb or unset; remote shells or Windows terminals where tput is missing.

Related errors

• running post-renderer: %w
• package chart into a .tgz archive: %v: %w
• failed to get access token %v
• failed to unmarshal gcloud command result into access token
• copy file(s) with %s failed: %w

AI-assisted analysis of GoogleContainerTools/skaffold@a1189de023 (2026-09-05). Data as JSON: /api/errors/20fae48915fbd435. Report an issue: GitHub.