feat(helm): add conditions and tags

This feature adds the ability to selectively control the loading of charts using entries in top chart's values.
When 'helm install --set tags.mytag=true', charts with that tag will be enabled unless disabled in parent by condition.
When 'helm install --set mychart.enabled=true', charts with that yaml path specified will be enabled.

Closes #1837

_proto/hapi/chart/metadata.proto

@@ -64,4 +64,10 @@ message Metadata {
 
 	// The API Version of this chart.
 	string apiVersion = 10;
+
+	// The condition to check to enable chart
+	string condition = 11;
+
+	// The tags to check to enable chart
+	string tags = 12;
 }

pkg/chartutil/requirements.go

@@ -17,10 +17,11 @@ package chartutil
 
 import (
 	"errors"
+	"log"
+	"strings"
 	"time"
 
 	"github.com/ghodss/yaml"
-
 	"k8s.io/helm/pkg/proto/hapi/chart"
 )
 
@@ -55,8 +56,17 @@ type Dependency struct {
 	// Appending `index.yaml` to this string should result in a URL that can be
 	// used to fetch the repository index.
 	Repository string `json:"repository"`
+	// A yaml path that resolves to a boolean, used for enabling/disabling charts (e.g. subchart1.enabled )
+	Condition string `json:"condition"`
+	// Tags can be used to group charts for enabling/disabling together
+	Tags []string `json:"tags"`
+	// Enabled bool determines if chart should be loaded
+	Enabled bool `json:"enabled"`
 }
 
+// ErrNoRequirementsFile to detect error condition
+type ErrNoRequirementsFile error
+
 // Requirements is a list of requirements for a chart.
 //
 // Requirements are charts upon which this chart depends. This expresses
@@ -106,3 +116,138 @@ func LoadRequirementsLock(c *chart.Chart) (*RequirementsLock, error) {
 	r := &RequirementsLock{}
 	return r, yaml.Unmarshal(data, r)
 }
+
+// ProcessRequirementsConditions disables charts based on condition path value in values
+func ProcessRequirementsConditions(reqs *Requirements, cvals Values) {
+	var cond string
+	var conds []string
+
+	if reqs != nil && len(reqs.Dependencies) > 0 {
+		for _, r := range reqs.Dependencies {
+			var hasTrue, hasFalse bool
+			cond = string(r.Condition)
+			// check for list
+			if len(cond) > 0 {
+				if strings.Contains(cond, ",") {
+					conds = strings.Split(strings.TrimSpace(cond), ",")
+				} else {
+					conds = []string{strings.TrimSpace(cond)}
+				}
+				for _, c := range conds {
+					if len(c) > 0 {
+						// retrieve value
+						vv, err := cvals.PathValue(c)
+						if err == nil {
+							if vv.(bool) {
+								hasTrue = true
+							}
+							if !vv.(bool) {
+								hasFalse = true
+							}
+						} else {
+							if _, ok := err.(ErrNoValue); !ok {
+								// this is a real error
+								log.Printf("Warning: PathValue returned error %v", err)
+							}
+						}
+						if vv != nil {
+							// got first value, break loop
+							break
+						}
+					}
+				}
+				if !hasTrue && hasFalse {
+					r.Enabled = false
+				} else {
+					if hasTrue {
+						r.Enabled = true
+					}
+				}
+			}
+
+		}
+	}
+}
+
+// ProcessRequirementsTags disables charts based on tags in values
+func ProcessRequirementsTags(reqs *Requirements, cvals Values) {
+	vt, err := cvals.Table("tags")
+	if err != nil {
+		return
+
+	}
+	if reqs != nil && len(reqs.Dependencies) > 0 {
+		for _, r := range reqs.Dependencies {
+			if len(r.Tags) > 0 {
+				tags := r.Tags
+
+				var hasTrue, hasFalse bool
+				for _, k := range tags {
+					if b, ok := vt[k]; ok {
+						if b.(bool) {
+							hasTrue = true
+						}
+						if !b.(bool) {
+							hasFalse = true
+						}
+					}
+				}
+				if !hasTrue && hasFalse {
+					r.Enabled = false
+				} else {
+					if hasTrue || !hasTrue && !hasFalse {
+						r.Enabled = true
+					}
+				}
+
+			}
+		}
+	}
+}
+
+// ProcessRequirementsEnabled removes disabled charts from dependencies
+func ProcessRequirementsEnabled(c *chart.Chart, v *chart.Config) error {
+	reqs, err := LoadRequirements(c)
+	if err != nil {
+		return ErrRequirementsNotFound
+	}
+	// set all to true
+	for _, lr := range reqs.Dependencies {
+		lr.Enabled = true
+	}
+	cvals, err := CoalesceValues(c, v)
+	if err != nil {
+		return err
+	}
+	// flag dependencies as enabled/disabled
+	ProcessRequirementsTags(reqs, cvals)
+	ProcessRequirementsConditions(reqs, cvals)
+
+	// make a map of charts to keep
+	rm := map[string]bool{}
+	for _, r := range reqs.Dependencies {
+		if !r.Enabled {
+			// remove disabled chart
+			rm[r.Name] = true
+		}
+	}
+	// don't keep disabled charts in new slice
+	cd := c.Dependencies[:0]
+	for _, n := range c.Dependencies {
+		if _, ok := rm[n.Metadata.Name]; !ok {
+			cd = append(cd, n)
+		}
+
+	}
+	// recursively call self to process sub dependencies
+	for _, t := range cd {
+		err := ProcessRequirementsEnabled(t, v)
+		// if its not just missing requirements file, return error
+		if nerr, ok := err.(ErrNoRequirementsFile); !ok && err != nil {
+			return nerr
+		}
+	}
+	c.Dependencies = cd
+
+	return nil
+}

pkg/chartutil/requirements_test.go

@@ -15,7 +15,10 @@ limitations under the License.
 package chartutil
 
 import (
+	"sort"
 	"testing"
+
+	"k8s.io/helm/pkg/proto/hapi/chart"
 )
 
 func TestLoadRequirements(t *testing.T) {
@@ -33,3 +36,173 @@ func TestLoadRequirementsLock(t *testing.T) {
 	}
 	verifyRequirementsLock(t, c)
 }
+func TestRequirementsTagsNonValue(t *testing.T) {
+	c, err := Load("testdata/subpop")
+	if err != nil {
+		t.Fatalf("Failed to load testdata: %s", err)
+	}
+	// tags with no effect
+	v := &chart.Config{Raw: string("tags:\n  nothinguseful: false\n\n")}
+	// expected charts including duplicates in alphanumeric order
+	e := []string{"parentchart", "subchart1", "subcharta", "subchartb"}
+
+	verifyRequirementsEnabled(t, c, v, e)
+}
+func TestRequirementsTagsDisabledL1(t *testing.T) {
+	c, err := Load("testdata/subpop")
+	if err != nil {
+		t.Fatalf("Failed to load testdata: %s", err)
+	}
+	// tags disabling a group
+	v := &chart.Config{Raw: string("tags:\n  front-end: false\n\n")}
+	// expected charts including duplicates in alphanumeric order
+	e := []string{"parentchart"}
+
+	verifyRequirementsEnabled(t, c, v, e)
+}
+func TestRequirementsTagsEnabledL1(t *testing.T) {
+	c, err := Load("testdata/subpop")
+	if err != nil {
+		t.Fatalf("Failed to load testdata: %s", err)
+	}
+	// tags disabling a group and enabling a different group
+	v := &chart.Config{Raw: string("tags:\n  front-end: false\n\n  back-end: true\n")}
+	// expected charts including duplicates in alphanumeric order
+	e := []string{"parentchart", "subchart2", "subchartb", "subchartc"}
+
+	verifyRequirementsEnabled(t, c, v, e)
+}
+func TestRequirementsTagsDisabledL2(t *testing.T) {
+	c, err := Load("testdata/subpop")
+	if err != nil {
+		t.Fatalf("Failed to load testdata: %s", err)
+	}
+	// tags disabling only children
+	v := &chart.Config{Raw: string("tags:\n  subcharta: false\n\n  subchartb: false\n")}
+	// expected charts including duplicates in alphanumeric order
+	e := []string{"parentchart", "subchart1"}
+
+	verifyRequirementsEnabled(t, c, v, e)
+}
+func TestRequirementsTagsDisabledL1Mixed(t *testing.T) {
+	c, err := Load("testdata/subpop")
+	if err != nil {
+		t.Fatalf("Failed to load testdata: %s", err)
+	}
+	// tags disabling all parents/children with additional tag re-enabling a parent
+	v := &chart.Config{Raw: string("tags:\n  front-end: false\n\n  subchart1: true\n\n  back-end: false\n")}
+	// expected charts including duplicates in alphanumeric order
+	e := []string{"parentchart", "subchart1"}
+
+	verifyRequirementsEnabled(t, c, v, e)
+}
+func TestRequirementsConditionsNonValue(t *testing.T) {
+	c, err := Load("testdata/subpop")
+	if err != nil {
+		t.Fatalf("Failed to load testdata: %s", err)
+	}
+	// tags with no effect
+	v := &chart.Config{Raw: string("subchart1:\n  nothinguseful: false\n\n")}
+	// expected charts including duplicates in alphanumeric order
+	e := []string{"parentchart", "subchart1", "subcharta", "subchartb"}
+
+	verifyRequirementsEnabled(t, c, v, e)
+}
+func TestRequirementsConditionsEnabledL1Both(t *testing.T) {
+	c, err := Load("testdata/subpop")
+	if err != nil {
+		t.Fatalf("Failed to load testdata: %s", err)
+	}
+	// conditions enabling the parent charts, effectively enabling children
+	v := &chart.Config{Raw: string("subchart1:\n  enabled: true\nsubchart2:\n  enabled: true\n")}
+	// expected charts including duplicates in alphanumeric order
+	e := []string{"parentchart", "subchart1", "subchart2", "subcharta", "subchartb", "subchartb", "subchartc"}
+
+	verifyRequirementsEnabled(t, c, v, e)
+}
+func TestRequirementsConditionsDisabledL1Both(t *testing.T) {
+	c, err := Load("testdata/subpop")
+	if err != nil {
+		t.Fatalf("Failed to load testdata: %s", err)
+	}
+	// conditions disabling the parent charts, effectively disabling children
+	v := &chart.Config{Raw: string("subchart1:\n  enabled: false\nsubchart2:\n  enabled: false\n")}
+	// expected charts including duplicates in alphanumeric order
+	e := []string{"parentchart"}
+
+	verifyRequirementsEnabled(t, c, v, e)
+}
+
+func TestRequirementsConditionsSecond(t *testing.T) {
+	c, err := Load("testdata/subpop")
+	if err != nil {
+		t.Fatalf("Failed to load testdata: %s", err)
+	}
+	// conditions a child using the second condition path of child's condition
+	v := &chart.Config{Raw: string("subchart1:\n  subcharta:\n    enabled: false\n")}
+	// expected charts including duplicates in alphanumeric order
+	e := []string{"parentchart", "subchart1", "subchartb"}
+
+	verifyRequirementsEnabled(t, c, v, e)
+}
+func TestRequirementsCombinedDisabledL2(t *testing.T) {
+	c, err := Load("testdata/subpop")
+	if err != nil {
+		t.Fatalf("Failed to load testdata: %s", err)
+	}
+	// tags enabling a parent/child group with condition disabling one child
+	v := &chart.Config{Raw: string("subchartc:\n  enabled: false\ntags:\n  back-end: true\n")}
+	// expected charts including duplicates in alphanumeric order
+	e := []string{"parentchart", "subchart1", "subchart2", "subcharta", "subchartb", "subchartb"}
+
+	verifyRequirementsEnabled(t, c, v, e)
+}
+func TestRequirementsCombinedDisabledL1(t *testing.T) {
+	c, err := Load("testdata/subpop")
+	if err != nil {
+		t.Fatalf("Failed to load testdata: %s", err)
+	}
+	// tags will not enable a child if parent is explicitly disabled with condition
+	v := &chart.Config{Raw: string("subchart1:\n  enabled: false\ntags:\n  front-end: true\n")}
+	// expected charts including duplicates in alphanumeric order
+	e := []string{"parentchart"}
+
+	verifyRequirementsEnabled(t, c, v, e)
+}
+
+func verifyRequirementsEnabled(t *testing.T, c *chart.Chart, v *chart.Config, e []string) {
+	out := []*chart.Chart{}
+	err := ProcessRequirementsEnabled(c, v)
+	if err != nil {
+		t.Errorf("Error processing enabled requirements %v", err)
+	}
+	out = extractCharts(c, out)
+	// build list of chart names
+	p := []string{}
+	for _, r := range out {
+		p = append(p, r.Metadata.Name)
+	}
+	//sort alphanumeric and compare to expectations
+	sort.Strings(p)
+	if len(p) != len(e) {
+		t.Errorf("Error slice lengths do not match got %v, expected %v", len(p), len(e))
+		return
+	}
+	for i := range p {
+		if p[i] != e[i] {
+			t.Errorf("Error slice values do not match got %v, expected %v", p[i], e[i])
+		}
+	}
+}
+
+// extractCharts recursively searches chart dependencies returning all charts found
+func extractCharts(c *chart.Chart, out []*chart.Chart) []*chart.Chart {
+
+	if len(c.Metadata.Name) > 0 {
+		out = append(out, c)
+	}
+	for _, d := range c.Dependencies {
+		out = extractCharts(d, out)
+	}
+	return out
+}

pkg/chartutil/testdata/subpop/Chart.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+description: A Helm chart for Kubernetes
+name: parentchart
+version: 0.1.0

pkg/chartutil/testdata/subpop/README.md

@@ -0,0 +1,18 @@
+## Subpop 
+
+This chart is for testing the processing of enabled/disabled charts  
+via conditions and tags.
+
+Currently there are three levels:
+
+````
+parent
+-1 tags: front-end, subchart1
+--A tags: front-end, subchartA
+--B tags: front-end, subchartB
+-2 tags: back-end, subchart2
+--B tags: back-end, subchartB
+--C tags: back-end, subchartC
+````
+
+Tags and conditions are currently in requirements.yaml files.

pkg/chartutil/testdata/subpop/charts/subchart1/Chart.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+description: A Helm chart for Kubernetes
+name: subchart1
+version: 0.1.0

pkg/chartutil/testdata/subpop/charts/subchart1/charts/subchartA/Chart.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+description: A Helm chart for Kubernetes
+name: subcharta
+version: 0.1.0

pkg/chartutil/testdata/subpop/charts/subchart1/charts/subchartA/templates/service.yaml

@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Chart.Name }}
+  labels:
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+  - port: {{ .Values.service.externalPort }}
+    targetPort: {{ .Values.service.internalPort }}
+    protocol: TCP
+    name: {{ .Values.service.name }}
+  selector:
+    app: {{ .Chart.Name }}

pkg/chartutil/testdata/subpop/charts/subchart1/charts/subchartA/values.yaml

@@ -0,0 +1,21 @@
+# Default values for subchart.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+replicaCount: 1
+image:
+  repository: nginx
+  tag: stable
+  pullPolicy: IfNotPresent
+service:
+  name: nginx
+  type: ClusterIP
+  externalPort: 80
+  internalPort: 80
+resources:
+  limits:
+    cpu: 100m
+    memory: 128Mi
+  requests:
+    cpu: 100m
+    memory: 128Mi
+

pkg/chartutil/testdata/subpop/charts/subchart1/charts/subchartB/Chart.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+description: A Helm chart for Kubernetes
+name: subchartb
+version: 0.1.0

pkg/chartutil/testdata/subpop/charts/subchart1/charts/subchartB/templates/service.yaml

@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Chart.Name }}
+  labels:
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+  - port: {{ .Values.service.externalPort }}
+    targetPort: {{ .Values.service.internalPort }}
+    protocol: TCP
+    name: {{ .Values.service.name }}
+  selector:
+    app: {{ .Chart.Name }}

pkg/chartutil/testdata/subpop/charts/subchart1/charts/subchartB/values.yaml

@@ -0,0 +1,21 @@
+# Default values for subchart.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+replicaCount: 1
+image:
+  repository: nginx
+  tag: stable
+  pullPolicy: IfNotPresent
+service:
+  name: nginx
+  type: ClusterIP
+  externalPort: 80
+  internalPort: 80
+resources:
+  limits:
+    cpu: 100m
+    memory: 128Mi
+  requests:
+    cpu: 100m
+    memory: 128Mi
+

pkg/chartutil/testdata/subpop/charts/subchart1/requirements.yaml

@@ -0,0 +1,15 @@
+dependencies:
+      - name: subcharta
+        repository: http://localhost:10191
+        version: 0.1.0
+        condition: subcharta.enabled,subchart1.subcharta.enabled
+        tags:
+          - front-end
+          - subcharta
+      - name: subchartb
+        repository: http://localhost:10191
+        version: 0.1.0
+        condition: subchartb.enabled
+        tags:
+          - front-end
+          - subchartb

pkg/chartutil/testdata/subpop/charts/subchart1/templates/service.yaml

@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Chart.Name }}
+  labels:
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+  - port: {{ .Values.service.externalPort }}
+    targetPort: {{ .Values.service.internalPort }}
+    protocol: TCP
+    name: {{ .Values.service.name }}
+  selector:
+    app: {{ .Chart.Name }}

pkg/chartutil/testdata/subpop/charts/subchart1/values.yaml

@@ -0,0 +1,21 @@
+# Default values for subchart.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+replicaCount: 1
+image:
+  repository: nginx
+  tag: stable
+  pullPolicy: IfNotPresent
+service:
+  name: nginx
+  type: ClusterIP
+  externalPort: 80
+  internalPort: 80
+resources:
+  limits:
+    cpu: 100m
+    memory: 128Mi
+  requests:
+    cpu: 100m
+    memory: 128Mi
+

pkg/chartutil/testdata/subpop/charts/subchart2/Chart.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+description: A Helm chart for Kubernetes
+name: subchart2
+version: 0.1.0

pkg/chartutil/testdata/subpop/charts/subchart2/charts/subchartB/Chart.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+description: A Helm chart for Kubernetes
+name: subchartb
+version: 0.1.0

pkg/chartutil/testdata/subpop/charts/subchart2/charts/subchartB/templates/service.yaml

@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: subchart2-{{ .Chart.Name }}
+  labels:
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+  - port: {{ .Values.service.externalPort }}
+    targetPort: {{ .Values.service.internalPort }}
+    protocol: TCP
+    name: subchart2-{{ .Values.service.name }}
+  selector:
+    app: {{ .Chart.Name }}

pkg/chartutil/testdata/subpop/charts/subchart2/charts/subchartB/values.yaml

@@ -0,0 +1,21 @@
+# Default values for subchart.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+replicaCount: 1
+image:
+  repository: nginx
+  tag: stable
+  pullPolicy: IfNotPresent
+service:
+  name: nginx
+  type: ClusterIP
+  externalPort: 80
+  internalPort: 80
+resources:
+  limits:
+    cpu: 100m
+    memory: 128Mi
+  requests:
+    cpu: 100m
+    memory: 128Mi
+

pkg/chartutil/testdata/subpop/charts/subchart2/charts/subchartC/Chart.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+description: A Helm chart for Kubernetes
+name: subchartc
+version: 0.1.0

pkg/chartutil/testdata/subpop/charts/subchart2/charts/subchartC/templates/service.yaml

@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Chart.Name }}
+  labels:
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+  - port: {{ .Values.service.externalPort }}
+    targetPort: {{ .Values.service.internalPort }}
+    protocol: TCP
+    name: {{ .Values.service.name }}
+  selector:
+    app: {{ .Chart.Name }}

pkg/chartutil/testdata/subpop/charts/subchart2/charts/subchartC/values.yaml

@@ -0,0 +1,21 @@
+# Default values for subchart.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+replicaCount: 1
+image:
+  repository: nginx
+  tag: stable
+  pullPolicy: IfNotPresent
+service:
+  name: nginx
+  type: ClusterIP
+  externalPort: 80
+  internalPort: 80
+resources:
+  limits:
+    cpu: 100m
+    memory: 128Mi
+  requests:
+    cpu: 100m
+    memory: 128Mi
+

pkg/chartutil/testdata/subpop/charts/subchart2/requirements.yaml

@@ -0,0 +1,15 @@
+dependencies:
+      - name: subchartb
+        repository: http://localhost:10191
+        version: 0.1.0
+        condition: subchartb.enabled,subchart2.subchartb.enabled
+        tags:
+          - back-end
+          - subchartb
+      - name: subchartc
+        repository: http://localhost:10191
+        version: 0.1.0
+        condition: subchartc.enabled
+        tags:
+          - back-end
+          - subchartc

pkg/chartutil/testdata/subpop/charts/subchart2/templates/service.yaml

@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Chart.Name }}
+  labels:
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+  - port: {{ .Values.service.externalPort }}
+    targetPort: {{ .Values.service.internalPort }}
+    protocol: TCP
+    name: {{ .Values.service.name }}
+  selector:
+    app: {{ .Chart.Name }}

pkg/chartutil/testdata/subpop/charts/subchart2/values.yaml

@@ -0,0 +1,21 @@
+# Default values for subchart.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+replicaCount: 1
+image:
+  repository: nginx
+  tag: stable
+  pullPolicy: IfNotPresent
+service:
+  name: nginx
+  type: ClusterIP
+  externalPort: 80
+  internalPort: 80
+resources:
+  limits:
+    cpu: 100m
+    memory: 128Mi
+  requests:
+    cpu: 100m
+    memory: 128Mi
+

pkg/chartutil/testdata/subpop/requirements.yaml

@@ -0,0 +1,15 @@
+dependencies:
+      - name: subchart1
+        repository: http://localhost:10191
+        version: 0.1.0
+        condition: subchart1.enabled
+        tags:
+          - front-end
+          - subchart1
+      - name: subchart2
+        repository: http://localhost:10191
+        version: 0.1.0
+        condition: subchart2.enabled
+        tags:
+          - back-end
+          - subchart2

pkg/chartutil/testdata/subpop/values.yaml

@@ -0,0 +1,7 @@
+# parent/values.yaml
+
+# switch-like
+tags:
+  front-end: true
+  back-end: false
+

pkg/chartutil/values.go

@@ -31,6 +31,9 @@ import (
 // ErrNoTable indicates that a chart does not have a matching table.
 type ErrNoTable error
 
+// ErrNoValue indicates that Values does not contain a key with a value
+type ErrNoValue error
+
 // GlobalKey is the name of the Values key that is used for storing global vars.
 const GlobalKey = "global"
 
@@ -376,3 +379,39 @@ func istable(v interface{}) bool {
 	_, ok := v.(map[string]interface{})
 	return ok
 }
+
+// PathValue takes a yaml path with . notation and returns the value if exists
+func (v Values) PathValue(ypath string) (interface{}, error) {
+	if len(ypath) == 0 {
+		return nil, error(fmt.Errorf("yaml path string cannot be zero length"))
+	}
+	yps := strings.Split(ypath, ".")
+	if len(ypath) == 1 {
+		// if exists must be root key not table
+		vals := v.AsMap()
+		k := yps[0]
+		if _, ok := vals[k]; ok && !istable(vals[k]) {
+			// key found
+			return vals[yps[0]], nil
+		}
+		// key not found
+		return nil, ErrNoValue(fmt.Errorf("%v is not a value", k))
+	}
+	table := yps[:len(yps)-1]
+	st := strings.Join(table, ".")
+	key := yps[len(yps)-1:]
+	sk := string(key[0])
+
+	t, err := v.Table(st)
+	if err != nil {
+		//no table
+		return nil, ErrNoValue(fmt.Errorf("%v is not a value", sk))
+	}
+	if k, ok := t[sk]; ok && !istable(k) {
+		// key found
+		return k, nil
+	}
+
+	// key not found
+	return nil, ErrNoValue(fmt.Errorf("key not found: %s", sk))
+}

pkg/chartutil/values_test.go

@@ -407,3 +407,37 @@ func TestCoalesceTables(t *testing.T) {
 		t.Errorf("Expected boat string, got %v", dst["boat"])
 	}
 }
+func TestPathValue(t *testing.T) {
+	doc := `
+title: "Moby Dick"
+chapter:
+  one:
+    title: "Loomings"
+  two:
+    title: "The Carpet-Bag"
+  three:
+    title: "The Spouter Inn"
+`
+	d, err := ReadValues([]byte(doc))
+	if err != nil {
+		t.Fatalf("Failed to parse the White Whale: %s", err)
+	}
+
+	if v, err := d.PathValue("chapter.one.title"); err != nil {
+		t.Errorf("Got error instead of title: %s\n%v", err, d)
+	} else if v != "Loomings" {
+		t.Errorf("No error but got wrong value for title: %s\n%v", err, d)
+	}
+	if _, err := d.PathValue("chapter.one.doesntexist"); err == nil {
+		t.Errorf("Non-existent key should return error: %s\n%v", err, d)
+	}
+	if _, err := d.PathValue("chapter.doesntexist.one"); err == nil {
+		t.Errorf("Non-existent key in middle of path should return error: %s\n%v", err, d)
+	}
+	if v, err := d.PathValue("title"); err == nil {
+		if v != "Moby Dick" {
+			t.Errorf("Failed to return values for root key title")
+		}
+	}
+
+}

pkg/helm/client.go

@@ -92,6 +92,11 @@ func (h *Client) InstallReleaseFromChart(chart *chart.Chart, ns string, opts ...
 			return nil, err
 		}
 	}
+	err := chartutil.ProcessRequirementsEnabled(req.Chart, req.Values)
+	if err != nil {
+		return nil, err
+	}
+
 	return h.install(ctx, req)
 }
 
@@ -156,6 +161,11 @@ func (h *Client) UpdateReleaseFromChart(rlsName string, chart *chart.Chart, opts
 			return nil, err
 		}
 	}
+	err := chartutil.ProcessRequirementsEnabled(req.Chart, req.Values)
+	if err != nil {
+		return nil, err
+	}
+
 	return h.update(ctx, req)
 }
 

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

@@ -71,6 +71,10 @@ type Metadata struct {
 	Icon string `protobuf:"bytes,9,opt,name=icon" json:"icon,omitempty"`
 	// The API Version of this chart.
 	ApiVersion string `protobuf:"bytes,10,opt,name=apiVersion" json:"apiVersion,omitempty"`
+	// The condition to check to enable chart
+	Condition string `protobuf:"bytes,11,opt,name=condition" json:"condition,omitempty"`
+	// The tags to check to enable chart
+	Tags []string `protobuf:"bytes,12,opt,name=tags" json:"tags,omitempty"`
 }
 
 func (m *Metadata) Reset()                    { *m = Metadata{} }
@@ -94,24 +98,25 @@ func init() {
 func init() { proto.RegisterFile("hapi/chart/metadata.proto", fileDescriptor2) }
 
 var fileDescriptor2 = []byte{
-	// 290 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x6c, 0x91, 0x4d, 0x4b, 0xf4, 0x30,
-	0x14, 0x85, 0xdf, 0x4e, 0xbf, 0x6f, 0x37, 0xc3, 0xe5, 0x65, 0x88, 0x2e, 0xa4, 0x74, 0xd5, 0x55,
-	0x07, 0x14, 0xc4, 0xb5, 0x20, 0x2e, 0x74, 0x3a, 0x52, 0xfc, 0x00, 0x77, 0xb1, 0x0d, 0x36, 0x68,
-	0x93, 0x92, 0x44, 0xc5, 0xff, 0xe8, 0x8f, 0x92, 0xa6, 0x9d, 0x99, 0x2e, 0xdc, 0xdd, 0x73, 0x9e,
-	0x9e, 0xdb, 0x9c, 0x04, 0x8e, 0x5a, 0xda, 0xf3, 0x75, 0xdd, 0x52, 0x65, 0xd6, 0x1d, 0x33, 0xb4,
-	0xa1, 0x86, 0x16, 0xbd, 0x92, 0x46, 0x22, 0x0c, 0xa8, 0xb0, 0x28, 0x3b, 0x07, 0xd8, 0x50, 0x2e,
-	0x0c, 0xe5, 0x82, 0x29, 0x44, 0xf0, 0x04, 0xed, 0x18, 0x71, 0x52, 0x27, 0x8f, 0x2b, 0x3b, 0xe3,
-	0x7f, 0xf0, 0x59, 0x47, 0xf9, 0x3b, 0x59, 0x58, 0x73, 0x14, 0xd9, 0xcf, 0x02, 0xa2, 0xcd, 0xb4,
-	0xf6, 0xcf, 0x18, 0x82, 0xd7, 0xca, 0x8e, 0x4d, 0x29, 0x3b, 0x23, 0x81, 0x50, 0xcb, 0x0f, 0x55,
-	0x33, 0x4d, 0xdc, 0xd4, 0xcd, 0xe3, 0x6a, 0x27, 0x07, 0xf2, 0xc9, 0x94, 0xe6, 0x52, 0x10, 0xcf,
-	0x06, 0x76, 0x12, 0x53, 0x48, 0x1a, 0xa6, 0x6b, 0xc5, 0x7b, 0x33, 0x50, 0xdf, 0xd2, 0xb9, 0x85,
-	0xc7, 0x10, 0xbd, 0xb1, 0xef, 0x2f, 0xa9, 0x1a, 0x4d, 0x02, 0xbb, 0x76, 0xaf, 0xf1, 0x02, 0x92,
-	0x6e, 0x5f, 0x4f, 0x93, 0x30, 0x75, 0xf3, 0xe4, 0x74, 0x55, 0x1c, 0x2e, 0xa0, 0x38, 0xb4, 0xaf,
-	0xe6, 0x9f, 0xe2, 0x0a, 0x02, 0x26, 0x5e, 0xb9, 0x60, 0x24, 0xb2, 0xbf, 0x9c, 0xd4, 0xd0, 0x8b,
-	0xd7, 0x52, 0x90, 0x78, 0xec, 0x35, 0xcc, 0x78, 0x02, 0x40, 0x7b, 0xfe, 0x38, 0x15, 0x00, 0x4b,
-	0x66, 0x4e, 0x96, 0x42, 0x70, 0x35, 0xa6, 0x13, 0x08, 0x1f, 0xca, 0x9b, 0x72, 0xfb, 0x54, 0x2e,
-	0xff, 0x61, 0x0c, 0xfe, 0xf5, 0xf6, 0xfe, 0xee, 0x76, 0xe9, 0x5c, 0x86, 0xcf, 0xbe, 0x3d, 0xce,
-	0x4b, 0x60, 0x9f, 0xe8, 0xec, 0x37, 0x00, 0x00, 0xff, 0xff, 0x65, 0x86, 0x8b, 0xda, 0xbf, 0x01,
-	0x00, 0x00,
+	// 311 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x6c, 0x91, 0xcd, 0x4b, 0xc3, 0x40,
+	0x10, 0xc5, 0xed, 0x47, 0x92, 0x66, 0xe2, 0xa1, 0x0c, 0x52, 0x56, 0x11, 0x09, 0x3d, 0xf5, 0x94,
+	0x82, 0x82, 0x78, 0x16, 0xc4, 0x83, 0xb6, 0x95, 0xe2, 0x07, 0x78, 0x5b, 0x93, 0xa5, 0x5d, 0x34,
+	0xbb, 0x61, 0x77, 0x55, 0xfc, 0xe7, 0x45, 0x76, 0x92, 0x36, 0x39, 0x78, 0x9b, 0xf7, 0x5e, 0xe6,
+	0x0d, 0xbf, 0x2c, 0x1c, 0x6f, 0x79, 0x25, 0xe7, 0xf9, 0x96, 0x1b, 0x37, 0x2f, 0x85, 0xe3, 0x05,
+	0x77, 0x3c, 0xab, 0x8c, 0x76, 0x1a, 0xc1, 0x47, 0x19, 0x45, 0xd3, 0x4b, 0x80, 0x05, 0x97, 0xca,
+	0x71, 0xa9, 0x84, 0x41, 0x84, 0xa1, 0xe2, 0xa5, 0x60, 0xbd, 0xb4, 0x37, 0x8b, 0xd7, 0x34, 0xe3,
+	0x11, 0x04, 0xa2, 0xe4, 0xf2, 0x83, 0xf5, 0xc9, 0xac, 0xc5, 0xf4, 0xb7, 0x0f, 0xa3, 0x45, 0x53,
+	0xfb, 0xef, 0x1a, 0xc2, 0x70, 0xab, 0x4b, 0xd1, 0x6c, 0xd1, 0x8c, 0x0c, 0x22, 0xab, 0x3f, 0x4d,
+	0x2e, 0x2c, 0x1b, 0xa4, 0x83, 0x59, 0xbc, 0xde, 0x49, 0x9f, 0x7c, 0x09, 0x63, 0xa5, 0x56, 0x6c,
+	0x48, 0x0b, 0x3b, 0x89, 0x29, 0x24, 0x85, 0xb0, 0xb9, 0x91, 0x95, 0xf3, 0x69, 0x40, 0x69, 0xd7,
+	0xc2, 0x13, 0x18, 0xbd, 0x8b, 0x9f, 0x6f, 0x6d, 0x0a, 0xcb, 0x42, 0xaa, 0xdd, 0x6b, 0xbc, 0x82,
+	0xa4, 0xdc, 0xe3, 0x59, 0x16, 0xa5, 0x83, 0x59, 0x72, 0x3e, 0xc9, 0xda, 0x1f, 0x90, 0xb5, 0xf4,
+	0xeb, 0xee, 0xa7, 0x38, 0x81, 0x50, 0xa8, 0x8d, 0x54, 0x82, 0x8d, 0xe8, 0x64, 0xa3, 0x3c, 0x97,
+	0xcc, 0xb5, 0x62, 0x71, 0xcd, 0xe5, 0x67, 0x3c, 0x03, 0xe0, 0x95, 0x7c, 0x6e, 0x00, 0x80, 0x92,
+	0x8e, 0x83, 0xa7, 0x10, 0xe7, 0x5a, 0x15, 0x92, 0x08, 0x12, 0x8a, 0x5b, 0xc3, 0x37, 0x3a, 0xbe,
+	0xb1, 0xec, 0xb0, 0x6e, 0xf4, 0xf3, 0x34, 0x85, 0xf0, 0xa6, 0xbe, 0x97, 0x40, 0xf4, 0xb4, 0xbc,
+	0x5b, 0xae, 0x5e, 0x96, 0xe3, 0x03, 0x8c, 0x21, 0xb8, 0x5d, 0x3d, 0x3e, 0xdc, 0x8f, 0x7b, 0xd7,
+	0xd1, 0x6b, 0x40, 0x00, 0x6f, 0x21, 0x3d, 0xea, 0xc5, 0x5f, 0x00, 0x00, 0x00, 0xff, 0xff, 0x5a,
+	0xa8, 0xcd, 0xe1, 0xf1, 0x01, 0x00, 0x00,
 }

pkg/resolver/resolver_test.go

@@ -119,7 +119,7 @@ func TestResolve(t *testing.T) {
 }
 
 func TestHashReq(t *testing.T) {
-	expect := "sha256:e70e41f8922e19558a8bf62f591a8b70c8e4622e3c03e5415f09aba881f13885"
+	expect := "sha256:c8250374210bd909cef274be64f871bd4e376d4ecd34a1589b5abf90b68866ba"
 	req := &chartutil.Requirements{
 		Dependencies: []*chartutil.Dependency{
 			{Name: "alpine", Version: "0.1.0", Repository: "http://localhost:8879/charts"},