Add values-from arg to create helmrelease cmd

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

cmd/flux/create_helmrelease.go

@@ -68,6 +68,14 @@ var createHelmReleaseCmd = &cobra.Command{
     --chart=podinfo \
     --values=./my-values.yaml
 
+  # Create a HelmRelease with values from a Kubernetes secret
+  kubectl -n app create secret generic my-secret-values \
+	--from-file=values.yaml=/path/to/my-secret-values.yaml
+  flux -n app create hr podinfo \
+    --source=HelmRepository/podinfo \
+    --chart=podinfo \
+    --values-from=Secret/my-secret-values
+
   # Create a HelmRelease with a custom release name
   flux create hr podinfo \
     --release-name=podinfo-dev
@@ -98,6 +106,7 @@ var (
 	hrChartVersion    string
 	hrTargetNamespace string
 	hrValuesFile      string
+	hrValuesFrom      flags.HelmReleaseValuesFrom
 )
 
 func init() {
@@ -108,6 +117,7 @@ func init() {
 	createHelmReleaseCmd.Flags().StringArrayVar(&hrDependsOn, "depends-on", nil, "HelmReleases that must be ready before this release can be installed, supported formats '<name>' and '<namespace>/<name>'")
 	createHelmReleaseCmd.Flags().StringVar(&hrTargetNamespace, "target-namespace", "", "namespace to install this release, defaults to the HelmRelease namespace")
 	createHelmReleaseCmd.Flags().StringVar(&hrValuesFile, "values", "", "local path to the values.yaml file")
+	createHelmReleaseCmd.Flags().Var(&hrValuesFrom, "values-from", hrValuesFrom.Description())
 	createCmd.AddCommand(createHelmReleaseCmd)
 }
 
@@ -171,6 +181,13 @@ func createHelmReleaseCmdRun(cmd *cobra.Command, args []string) error {
 		helmRelease.Spec.Values = &apiextensionsv1.JSON{Raw: json}
 	}
 
+	if hrValuesFrom.String() != "" {
+		helmRelease.Spec.ValuesFrom = []helmv2.ValuesReference{{
+			Kind: hrValuesFrom.Kind,
+			Name: hrValuesFrom.Name,
+		}}
+	}
+
 	if export {
 		return exportHelmRelease(helmRelease)
 	}

docs/cmd/flux_create_helmrelease.md

@@ -38,6 +38,14 @@ flux create helmrelease [name] [flags]
     --chart=podinfo \
     --values=./my-values.yaml
 
+  # Create a HelmRelease with values from a Kubernetes secret
+  kubectl -n app create secret generic my-secret-values \
+	--from-file=values.yaml=/path/to/my-secret-values.yaml
+  flux -n app create hr podinfo \
+    --source=HelmRepository/podinfo \
+    --chart=podinfo \
+    --values-from=Secret/my-secret-values
+
   # Create a HelmRelease with a custom release name
   flux create hr podinfo \
     --release-name=podinfo-dev
@@ -62,14 +70,15 @@ flux create helmrelease [name] [flags]
 ### Options
 
 ```
-      --chart string              Helm chart name or path
-      --chart-version string      Helm chart version, accepts a semver range (ignored for charts from GitRepository sources)
-      --depends-on stringArray    HelmReleases that must be ready before this release can be installed, supported formats '<name>' and '<namespace>/<name>'
-  -h, --help                      help for helmrelease
-      --release-name string       name used for the Helm release, defaults to a composition of '[<target-namespace>-]<HelmRelease-name>'
-      --source helmChartSource    source that contains the chart in the format '<kind>/<name>',where kind can be one of: (HelmRepository, GitRepository, Bucket)
-      --target-namespace string   namespace to install this release, defaults to the HelmRelease namespace
-      --values string             local path to the values.yaml file
+      --chart string                        Helm chart name or path
+      --chart-version string                Helm chart version, accepts a semver range (ignored for charts from GitRepository sources)
+      --depends-on stringArray              HelmReleases that must be ready before this release can be installed, supported formats '<name>' and '<namespace>/<name>'
+  -h, --help                                help for helmrelease
+      --release-name string                 name used for the Helm release, defaults to a composition of '[<target-namespace>-]<HelmRelease-name>'
+      --source helmChartSource              source that contains the chart in the format '<kind>/<name>',where kind can be one of: (HelmRepository, GitRepository, Bucket)
+      --target-namespace string             namespace to install this release, defaults to the HelmRelease namespace
+      --values string                       local path to the values.yaml file
+      --values-from helmReleaseValuesFrom   Kubernetes object reference that contains the values.yaml data key in the format '<kind>/<name>',where kind can be one of: (Secret, ConfigMap)
 ```
 
 ### Options inherited from parent commands

internal/flags/helm_release_values.go

@@ -0,0 +1,71 @@
+/*
+Copyright 2020 The Flux 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 flags
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/fluxcd/flux2/internal/utils"
+)
+
+var supportedHelmReleaseValuesFromKinds = []string{"Secret", "ConfigMap"}
+
+type HelmReleaseValuesFrom struct {
+	Kind string
+	Name string
+}
+
+func (h *HelmReleaseValuesFrom) String() string {
+	if h.Name == "" {
+		return ""
+	}
+	return fmt.Sprintf("%s/%s", h.Kind, h.Name)
+}
+
+func (h *HelmReleaseValuesFrom) Set(str string) error {
+	if strings.TrimSpace(str) == "" {
+		return fmt.Errorf("no values given, please specify %s",
+			h.Description())
+	}
+
+	sourceKind, sourceName := utils.ParseObjectKindName(str)
+	if sourceKind == "" {
+		return fmt.Errorf("invalid Kubernetes object reference '%s', must be in format <kind>/<name>", str)
+	}
+	if !utils.ContainsItemString(supportedHelmReleaseValuesFromKinds, sourceKind) {
+		return fmt.Errorf("reference kind '%s' is not supported, can be one of: %s",
+			sourceKind, strings.Join(supportedHelmReleaseValuesFromKinds, ", "))
+	}
+
+	h.Name = sourceName
+	h.Kind = sourceKind
+
+	return nil
+}
+
+func (h *HelmReleaseValuesFrom) Type() string {
+	return "helmReleaseValuesFrom"
+}
+
+func (h *HelmReleaseValuesFrom) Description() string {
+	return fmt.Sprintf(
+		"Kubernetes object reference that contains the values.yaml data key in the format '<kind>/<name>',"+
+			"where kind can be one of: (%s)",
+		strings.Join(supportedHelmReleaseValuesFromKinds, ", "),
+	)
+}