feat(charts): add 'dependencies:' to Chart.yaml

This feature adds a dependencies section to a chart file. It is a
prerequisite for adding automated chart management tooling as described
in #874.

_proto/hapi/chart/metadata.proto

@@ -27,6 +27,19 @@ message Maintainer {
 	string email = 2;
 }
 
+// Dependency describes this chart's dependency on another chart.
+message Dependency {
+	// Name is the name of the dependency, e.g. 'nginx'
+	string name = 1;
+
+	// Repository is the repository URL. Appending '/index.yaml' to this should
+	// return the repo index.
+	string repository = 2;
+
+	// Version is a SemVer 2 version.
+	string version = 3;
+}
+
 //	Metadata for a Chart file. This models the structure of a Chart.yaml file.
 //
 // 	Spec: https://k8s.io/helm/blob/master/docs/design/chart_format.md#the-chart-file
@@ -61,4 +74,6 @@ message Metadata {
 
 	// The URL to an icon file.
 	string icon = 9;
+
+	repeated Dependency dependencies = 10;
 }

pkg/chartutil/chartfile_test.go

@@ -90,4 +90,25 @@ func verifyChartfile(t *testing.T, f *chart.Metadata) {
 		}
 	}
 
+	if len(f.Dependencies) != 2 {
+		t.Fatalf("Expected 2 dependencies, got %d", len(f.Dependencies))
+	}
+
+	deps := []*chart.Dependency{
+		{Name: "alpine", Version: "0.1.0", Repository: "https://example.com/charts"},
+		{Name: "mariner", Version: "4.3.2", Repository: "https://example.com/charts"},
+	}
+	for i, tt := range deps {
+		c := f.Dependencies[i]
+		if c.Name != tt.Name {
+			t.Errorf("Expected name %q, got %q", tt.Name, c.Name)
+		}
+		if c.Version != tt.Version {
+			t.Errorf("Expected version %q, got %q", tt.Version, c.Version)
+		}
+		if c.Repository != tt.Repository {
+			t.Errorf("Expected repository %q, got %q", tt.Repository, c.Repository)
+		}
+	}
+
 }

pkg/chartutil/testdata/chartfiletest.yaml

@@ -14,3 +14,10 @@ sources:
   - https://example.com/foo/bar
 home: http://example.com
 icon: https://example.com/64x64.png
+dependencies:
+  - name: alpine
+    version: "0.1.0"
+    repository: https://example.com/charts
+  - name: mariner
+    version: "4.3.2"
+    repository: https://example.com/charts

pkg/chartutil/testdata/frobnitz/Chart.yaml

@@ -14,3 +14,10 @@ sources:
   - https://example.com/foo/bar
 home: http://example.com
 icon: https://example.com/64x64.png
+dependencies:
+  - name: alpine
+    version: "0.1.0"
+    repository: https://example.com/charts
+  - name: mariner
+    version: "4.3.2"
+    repository: https://example.com/charts

pkg/proto/hapi/chart/chart.pb.go

@@ -16,6 +16,7 @@ It has these top-level messages:
 	Config
 	Value
 	Maintainer
+	Dependency
 	Metadata
 	Template
 */

pkg/proto/hapi/chart/metadata.pb.go

@@ -32,7 +32,7 @@ var Metadata_Engine_value = map[string]int32{
 func (x Metadata_Engine) String() string {
 	return proto.EnumName(Metadata_Engine_name, int32(x))
 }
-func (Metadata_Engine) EnumDescriptor() ([]byte, []int) { return fileDescriptor2, []int{1, 0} }
+func (Metadata_Engine) EnumDescriptor() ([]byte, []int) { return fileDescriptor2, []int{2, 0} }
 
 // Maintainer describes a Chart maintainer.
 type Maintainer struct {
@@ -47,6 +47,29 @@ func (m *Maintainer) String() string            { return proto.CompactTextString
 func (*Maintainer) ProtoMessage()               {}
 func (*Maintainer) Descriptor() ([]byte, []int) { return fileDescriptor2, []int{0} }
 
+// Dependency describes this chart's dependency on another chart.
+type Dependency struct {
+	// Name is the name of the dependency, e.g. 'nginx'
+	Name string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	// Repository is the repository URL. Appending '/index.yaml' to this should
+	// return the repo index.
+	Repository string `protobuf:"bytes,2,opt,name=repository" json:"repository,omitempty"`
+	// Version is a SemVer 2 version range.
+	// This can be an exact version or any of the version range operators
+	// described here: https://github.com/Masterminds/semver/blob/master/README.md
+	Version string `protobuf:"bytes,3,opt,name=version" json:"version,omitempty"`
+	// FetchedVersion is a computed field that indicates exactly which version
+	// was fetched by tooling. It is an exact version (not a range).
+	//
+	// This plays the roll of a "lock" for this dependency.
+	FetchedVersion string `protobuf:"bytes,4,opt,name=fetchedVersion" json:"fetchedVersion,omitempty"`
+}
+
+func (m *Dependency) Reset()                    { *m = Dependency{} }
+func (m *Dependency) String() string            { return proto.CompactTextString(m) }
+func (*Dependency) ProtoMessage()               {}
+func (*Dependency) Descriptor() ([]byte, []int) { return fileDescriptor2, []int{1} }
+
 // 	Metadata for a Chart file. This models the structure of a Chart.yaml file.
 //
 // 	Spec: https://k8s.io/helm/blob/master/docs/design/chart_format.md#the-chart-file
@@ -68,13 +91,14 @@ type Metadata struct {
 	// The name of the template engine to use. Defaults to 'gotpl'.
 	Engine string `protobuf:"bytes,8,opt,name=engine" json:"engine,omitempty"`
 	// The URL to an icon file.
-	Icon string `protobuf:"bytes,9,opt,name=icon" json:"icon,omitempty"`
+	Icon         string        `protobuf:"bytes,9,opt,name=icon" json:"icon,omitempty"`
+	Dependencies []*Dependency `protobuf:"bytes,10,rep,name=dependencies" json:"dependencies,omitempty"`
 }
 
 func (m *Metadata) Reset()                    { *m = Metadata{} }
 func (m *Metadata) String() string            { return proto.CompactTextString(m) }
 func (*Metadata) ProtoMessage()               {}
-func (*Metadata) Descriptor() ([]byte, []int) { return fileDescriptor2, []int{1} }
+func (*Metadata) Descriptor() ([]byte, []int) { return fileDescriptor2, []int{2} }
 
 func (m *Metadata) GetMaintainers() []*Maintainer {
 	if m != nil {
@@ -83,30 +107,42 @@ func (m *Metadata) GetMaintainers() []*Maintainer {
 	return nil
 }
 
+func (m *Metadata) GetDependencies() []*Dependency {
+	if m != nil {
+		return m.Dependencies
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterType((*Maintainer)(nil), "hapi.chart.Maintainer")
+	proto.RegisterType((*Dependency)(nil), "hapi.chart.Dependency")
 	proto.RegisterType((*Metadata)(nil), "hapi.chart.Metadata")
 	proto.RegisterEnum("hapi.chart.Metadata_Engine", Metadata_Engine_name, Metadata_Engine_value)
 }
 
 var fileDescriptor2 = []byte{
-	// 275 bytes of a gzipped FileDescriptorProto
+	// 346 bytes of a gzipped FileDescriptorProto
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