Move cloud metadata packages and kubernetes resources marshaling to internal

Decouples cloud provider metadata packages from kubernetes related code

Signed-off-by: Malte Poll <mp@edgeless.systems>

internal/cloud/gcp/writer_test.go

@@ -0,0 +1,54 @@
+package gcp
+
+import (
+	"testing"
+
+	"github.com/spf13/afero"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestWriteGCEConf(t *testing.T) {
+	config := "someConfig"
+
+	testCases := map[string]struct {
+		fs        afero.Afero
+		wantValue string
+		wantErr   bool
+	}{
+		"write works": {
+			fs: afero.Afero{
+				Fs: afero.NewMemMapFs(),
+			},
+			wantValue: config,
+			wantErr:   false,
+		},
+		"write fails": {
+			fs: afero.Afero{
+				Fs: afero.NewReadOnlyFs(afero.NewMemMapFs()),
+			},
+			wantErr: true,
+		},
+	}
+
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			assert := assert.New(t)
+			require := require.New(t)
+
+			writer := Writer{
+				fs: tc.fs,
+			}
+			err := writer.WriteGCEConf(config)
+
+			if tc.wantErr {
+				assert.Error(err)
+				return
+			}
+			require.NoError(err)
+			value, err := tc.fs.ReadFile("/etc/gce.conf")
+			assert.NoError(err)
+			assert.Equal(tc.wantValue, string(value))
+		})
+	}
+}