move coreos-cloudinit into config/cloudinit

Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>

config/cloudinit/system/etc_hosts.go

@@ -0,0 +1,62 @@
+// 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 system
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path"
+
+	"github.com/rancher/os/config/cloudinit/config"
+)
+
+const DefaultIpv4Address = "127.0.0.1"
+
+type EtcHosts struct {
+	config.EtcHosts
+}
+
+func (eh EtcHosts) generateEtcHosts() (out string, err error) {
+	if eh.EtcHosts != "localhost" {
+		return "", errors.New("Invalid option to manage_etc_hosts")
+	}
+
+	// use the operating system hostname
+	hostname, err := os.Hostname()
+	if err != nil {
+		return "", err
+	}
+
+	return fmt.Sprintf("%s %s\n", DefaultIpv4Address, hostname), nil
+
+}
+
+func (eh EtcHosts) File() (*File, error) {
+	if eh.EtcHosts == "" {
+		return nil, nil
+	}
+
+	etcHosts, err := eh.generateEtcHosts()
+	if err != nil {
+		return nil, err
+	}
+
+	return &File{config.File{
+		Path:               path.Join("etc", "hosts"),
+		RawFilePermissions: "0644",
+		Content:            etcHosts,
+	}}, nil
+}