Split out systemd package

Part of splitting up the CoreOS PR

hack/.packages

@@ -31,6 +31,7 @@ k8s.io/kops/pkg/model
 k8s.io/kops/pkg/model/components
 k8s.io/kops/pkg/model/iam
 k8s.io/kops/pkg/model/resources
+k8s.io/kops/pkg/systemd
 k8s.io/kops/pkg/validation
 k8s.io/kops/protokube/cmd/protokube
 k8s.io/kops/protokube/pkg/protokube

nodeup/pkg/model/docker.go

@@ -21,6 +21,7 @@ import (
 	"github.com/blang/semver"
 	"github.com/golang/glog"
 	"k8s.io/kops/nodeup/pkg/model/resources"
+	"k8s.io/kops/pkg/systemd"
 	"k8s.io/kops/upup/pkg/fi"
 	"k8s.io/kops/upup/pkg/fi/nodeup/nodetasks"
 )
@@ -296,7 +297,7 @@ func (b *DockerBuilder) buildSystemdService(dockerVersion semver.Version) *nodet
 		hasDockerBabysitter = true
 	}
 
-	manifest := &ServiceManifest{}
+	manifest := &systemd.Manifest{}
 	manifest.Set("Unit", "Description", "Docker Application Container Engine")
 	manifest.Set("Unit", "Documentation", "https://docs.docker.com")
 

pkg/systemd/manifest.go

@@ -0,0 +1,90 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+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 systemd
+
+import "bytes"
+
+type Manifest struct {
+	Sections []*ManifestSection
+}
+
+type ManifestSection struct {
+	Key     string
+	Entries []*ManifestEntry
+}
+
+type ManifestEntry struct {
+	Key   string
+	Value string
+}
+
+func (s *Manifest) Set(sectionKey string, key string, value string) {
+	section := s.getOrCreateSection(sectionKey)
+	section.Set(key, value)
+}
+
+func (s *Manifest) getOrCreateSection(key string) *ManifestSection {
+	for _, section := range s.Sections {
+		if section.Key == key {
+			return section
+		}
+	}
+	section := &ManifestSection{
+		Key: key,
+	}
+	s.Sections = append(s.Sections, section)
+	return section
+}
+
+func (s *Manifest) Render() string {
+	var b bytes.Buffer
+
+	for i, section := range s.Sections {
+		if i != 0 {
+			b.WriteString("\n")
+		}
+		b.WriteString(section.Render())
+	}
+
+	return b.String()
+}
+
+func (s *ManifestSection) Set(key string, value string) {
+	for _, entry := range s.Entries {
+		if entry.Key == key {
+			entry.Value = value
+			return
+		}
+	}
+
+	entry := &ManifestEntry{
+		Key:   key,
+		Value: value,
+	}
+	s.Entries = append(s.Entries, entry)
+}
+
+func (s *ManifestSection) Render() string {
+	var b bytes.Buffer
+
+	b.WriteString("[" + s.Key + "]\n")
+	for _, entry := range s.Entries {
+		b.WriteString(entry.Key + "=" + entry.Value + "\n")
+	}
+
+	return b.String()
+}