Function resolveRenderBrowser

cli/plugins/webfetch_render.go:127–152

resolveRenderBrowser locates the browser binary to drive, in order of precedence: explicit CHATCLI_WEBFETCH_RENDER_BROWSER path, rod's own system lookup (Chrome/Chromium/Edge), Chromium-based fallbacks rod does not know about (Brave), and finally the opt-in auto-provision. Empty bin with ok=true mea

()

// not know about (Brave), and finally the opt-in auto-provision. Empty bin
// with ok=true means "let rod download its pinned snapshot".
func resolveRenderBrowser() (bin string, ok bool, err error) {
	if explicit := strings.TrimSpace(os.Getenv("CHATCLI_WEBFETCH_RENDER_BROWSER")); explicit != "" {
		// Canonicalize and require an absolute path: the override names one
		// specific binary, so relative segments (PATH ambiguity, ../
		// traversal) are rejected rather than resolved.
		explicit = filepath.Clean(explicit)
		if !filepath.IsAbs(explicit) {
			return "", false, fmt.Errorf("render browser override %q must be an absolute path (check CHATCLI_WEBFETCH_RENDER_BROWSER)", explicit)
		}
		if _, statErr := os.Stat(explicit); statErr != nil {
			return "", false, fmt.Errorf("render browser override %q is not accessible (check CHATCLI_WEBFETCH_RENDER_BROWSER): %w", explicit, statErr)
		}
		return explicit, true, nil
	}
	if path, found := systemBrowserLookup(); found {
		return path, true, nil
	}
	if path, found := lookupFallbackBrowser(); found {
		return path, true, nil
	}
	if boolEnvTrue("CHATCLI_WEBFETCH_RENDER_AUTOPROVISION") {
		return "", true, nil
	}
	return "", false, fmt.Errorf(
		"no Chrome/Chromium/Edge found for JS rendering: install one, point CHATCLI_WEBFETCH_RENDER_BROWSER at a Chromium-based binary, or set CHATCLI_WEBFETCH_RENDER_AUTOPROVISION=true to let chatcli download a pinned Chromium (~150 MB, one time)")
}

// systemBrowserLookup locates a rod-known system browser. A variable so
// tests can simulate hosts with no browser installed — rod's LookPath