Add state disk volume mounter

Signed-off-by: Daniel Weiße <dw@edgeless.systems>

state/test/integration_test.go

@@ -0,0 +1,57 @@
+// go:build integration
+package integration
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"testing"
+
+	"github.com/edgelesssys/constellation/state/mapper"
+	"github.com/martinjungblut/go-cryptsetup"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+const (
+	devicePath   = "testDevice"
+	mappedDevice = "mappedDevice"
+)
+
+func setup() error {
+	return exec.Command("/bin/dd", "if=/dev/zero", fmt.Sprintf("of=%s", devicePath), "bs=64M", "count=1").Run()
+}
+
+func teardown() error {
+	return exec.Command("/bin/rm", "-f", devicePath).Run()
+}
+
+func TestMain(m *testing.M) {
+	if os.Getuid() != 0 {
+		fmt.Printf("This test suite requires root privileges, as libcrypsetup uses the kernel's device mapper.\n")
+		os.Exit(1)
+	}
+
+	result := m.Run()
+	os.Exit(result)
+}
+
+func TestMapper(t *testing.T) {
+	cryptsetup.SetDebugLevel(cryptsetup.CRYPT_LOG_VERBOSE)
+	cryptsetup.SetLogCallback(func(level int, message string) { fmt.Println(message) })
+	assert := assert.New(t)
+	require := require.New(t)
+	require.NoError(setup(), "failed to setup test disk")
+	defer func() { require.NoError(teardown(), "failed to delete test disk") }()
+
+	mapper, err := mapper.New(devicePath)
+	require.NoError(err, "failed to initialize crypt device")
+	defer func() { require.NoError(mapper.Close(), "failed to close crypt device") }()
+
+	passphrase := "unit-test"
+	require.NoError(mapper.FormatDisk(passphrase), "failed to format disk")
+	require.NoError(mapper.MapDisk(mappedDevice, passphrase), "failed to map disk")
+
+	require.NoError(mapper.UnmapDisk(mappedDevice), "failed to remove disk mapping")
+	assert.Error(mapper.MapDisk(mappedDevice, "invalid-passphrase"), "was able to map disk with incorrect passphrase")
+}