Separate the codebase for XL and FS format.json related code (#5317)

cmd/format-fs_test.go

@@ -0,0 +1,102 @@
+/*
+ * Minio Cloud Storage, (C) 2017 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// TestFSFormatFS - tests initFormatFS, formatMetaGetFormatBackendFS, formatFSGetVersion.
+func TestFSFormatFS(t *testing.T) {
+	// Prepare for testing
+	disk := filepath.Join(globalTestTmpDir, "minio-"+nextSuffix())
+	defer os.RemoveAll(disk)
+
+	fsFormatPath := pathJoin(disk, minioMetaBucket, formatConfigFile)
+
+	// Assign a new UUID.
+	uuid := mustGetUUID()
+
+	// Initialize meta volume, if volume already exists ignores it.
+	if err := initMetaVolumeFS(disk, uuid); err != nil {
+		t.Fatal(err)
+	}
+
+	rlk, err := initFormatFS(disk)
+	if err != nil {
+		t.Fatal(err)
+	}
+	rlk.Close()
+
+	// Do the basic sanity checks to check if initFormatFS() did its job.
+	f, err := os.OpenFile(fsFormatPath, os.O_RDWR, 0)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+
+	format, err := formatMetaGetFormatBackendFS(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if format != formatBackendFS {
+		t.Fatalf(`expected: %s, got: %s`, formatBackendFS, format)
+	}
+	version, err := formatFSGetVersion(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if version != formatFSVersionV1 {
+		t.Fatalf(`expected: %s, got: %s`, formatFSVersionV1, version)
+	}
+
+	// Corrupt the format.json file and test the functions.
+	// formatMetaGetFormatBackendFS, formatFSGetVersion, initFormatFS should return errors.
+	if err = f.Truncate(0); err != nil {
+		t.Fatal(err)
+	}
+	if _, err = f.WriteString("b"); err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err = formatMetaGetFormatBackendFS(f); err == nil {
+		t.Fatal("expected to fail")
+	}
+	if _, err = formatFSGetVersion(rlk); err == nil {
+		t.Fatal("expected to fail")
+	}
+	if _, err = initFormatFS(disk); err == nil {
+		t.Fatal("expected to fail")
+	}
+
+	// With unknown formatMetaV1.Version formatMetaGetFormatBackendFS, initFormatFS should return error.
+	if err = f.Truncate(0); err != nil {
+		t.Fatal(err)
+	}
+	// Here we set formatMetaV1.Version to "2"
+	if _, err = f.WriteString(`{"version":"2","format":"fs","fs":{"version":"1"}}`); err != nil {
+		t.Fatal(err)
+	}
+	if _, err = formatMetaGetFormatBackendFS(f); err == nil {
+		t.Fatal("expected to fail")
+	}
+	if _, err = initFormatFS(disk); err == nil {
+		t.Fatal("expected to fail")
+	}
+}