Refacture structure proposal. (#1793)

command/runtime-checks.go

@@ -0,0 +1,53 @@
+/*
+ * Minio Client (C) 2014, 2015, 2016 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 command
+
+import (
+	"fmt"
+	"runtime"
+	"strings"
+
+	"github.com/hashicorp/go-version"
+	"github.com/minio/mc/pkg/console"
+)
+
+// check if minimum Go version is met.
+func checkGoVersion() {
+	runtimeVersion := runtime.Version()
+
+	// Checking version is always successful with go tip
+	if strings.HasPrefix(runtimeVersion, "devel") {
+		return
+	}
+
+	// Parsing golang version
+	curVersion, e := version.NewVersion(runtimeVersion[2:])
+	if e != nil {
+		console.Fatalln("Unable to determine current go version.", e)
+	}
+
+	// Prepare version constraint.
+	constraints, e := version.NewConstraint(minGoVersion)
+	if e != nil {
+		console.Fatalln("Unable to check go version.")
+	}
+
+	// Check for minimum version.
+	if !constraints.Check(curVersion) {
+		console.Fatalln(fmt.Sprintf("Please recompile Minio with Golang version %s.", minGoVersion))
+	}
+}