From fce80136e3554bd0f1213403e6a6d7c868a727f8 Mon Sep 17 00:00:00 2001
From: Xiang Li <xiang.li@coreos.com>
Date: Fri, 30 Jan 2015 12:10:05 -0800
Subject: [PATCH] main: detects coreos

---
 main.go              |  3 +++
 pkg/coreos/coreos.go | 27 +++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 pkg/coreos/coreos.go

diff --git a/main.go b/main.go
index 7983de712..3c3f47e42 100644
--- a/main.go
+++ b/main.go
@@ -30,6 +30,7 @@ import (
 
 	"github.com/coreos/etcd/etcdmain"
 	"github.com/coreos/etcd/migrate/starter"
+	"github.com/coreos/etcd/pkg/coreos"
 )
 
 func main() {
@@ -41,6 +42,8 @@ func main() {
 		if v {
 			starter.StartDesiredVersion(os.Args[1:])
 		}
+	} else if coreos.IsCoreOS() {
+		starter.StartDesiredVersion(os.Args[1:])
 	}
 	etcdmain.Main()
 }
diff --git a/pkg/coreos/coreos.go b/pkg/coreos/coreos.go
new file mode 100644
index 000000000..226d193c3
--- /dev/null
+++ b/pkg/coreos/coreos.go
@@ -0,0 +1,27 @@
+// Copyright 2015 CoreOS, 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 coreos
+
+import (
+	"io/ioutil"
+	"strings"
+)
+
+func IsCoreOS() bool {
+	b, err := ioutil.ReadFile("/usr/lib/os-release")
+	if err != nil {
+		return false
+	}
+	return strings.Contains(string(b), "ID=coreos")
+}