src/tests/disable_syscalls/ktrace_works_when_enabled/ktrace_works_when_enabled_test.go

// Copyright 2020 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package main

import (
	"os"
	"path/filepath"
	"strings"
	"testing"

	"go.fuchsia.dev/fuchsia/src/testing/emulator"
	"go.fuchsia.dev/fuchsia/src/tests/disable_syscalls/support"
)

func TestKtraceWorksWhenEnabled(t *testing.T) {
	exDir := execDir(t)
	distro, err := emulator.UnpackFrom(filepath.Join(exDir, "test_data"), emulator.DistributionParams{
		Emulator: emulator.Qemu,
	})
	if err != nil {
		t.Fatal(err)
	}
	defer func() {
		if err = distro.Delete(); err != nil {
			t.Error(err)
		}
	}()
	arch, err := distro.TargetCPU()
	if err != nil {
		t.Fatal(err)
	}

	stdout, stderr, err := distro.RunNonInteractive(
		"/boot/bin/ktrace start 0xff",
		support.ToolPath(t, "minfs"),
		support.ToolPath(t, "zbi"),
		emulator.Params{
			Arch:          arch,
			ZBI:           support.ZbiPath(t),
			AppendCmdline: "kernel.enable-debugging-syscalls=true",
		})
	if err != nil {
		t.Fatal(err)
	}

	ensureDoesNotContain(t, stdout, "ZX_ERR_NOT_SUPPORTED")
	ensureDoesNotContain(t, stderr, "ZX_ERR_NOT_SUPPORTED")
}

func ensureDoesNotContain(t *testing.T, output, lookFor string) {
	if strings.Contains(output, lookFor) {
		t.Fatalf("output contains '%s'", lookFor)
	}
}

func execDir(t *testing.T) string {
	ex, err := os.Executable()
	if err != nil {
		t.Fatal(err)
		return ""
	}
	return filepath.Dir(ex)
}