basic helm3 support as a datasource

examples/helm3/components/apache/datasource.libsonnet

@@ -0,0 +1,10 @@
+{
+    objects: import 'data://helm/apache?config-from=apache-config',
+    config: {
+        options: {
+            repo: 'https://charts.bitnami.com/bitnami',
+        },
+        values: {
+        }
+    }
+}

examples/helm3/components/apache/index.jsonnet

@@ -0,0 +1 @@
+(import 'datasource.libsonnet').objects

examples/helm3/components/victoria-metrics/datasource.libsonnet

@@ -0,0 +1,7 @@
+{
+    objects: import 'data://helm/github.com/VictoriaMetrics/helm-charts/raw/347d4558d9c25cd341718bf5a2ee167da042c080/packages/victoria-metrics-cluster-0.9.6.tgz?config-from=victoria-config',
+    config: {
+        options: {},
+        values: {}
+    }
+}

examples/helm3/components/victoria-metrics/index.jsonnet

@@ -0,0 +1 @@
+(import 'datasource.libsonnet').objects

examples/helm3/environments/base.libsonnet

@@ -0,0 +1,6 @@
+
+// this file has the baseline default parameters
+{
+  components: {
+  },
+}

examples/helm3/environments/default.libsonnet

@@ -0,0 +1,8 @@
+
+// this file has the param overrides for the default environment
+local base = import './base.libsonnet';
+
+base {
+  components +: {
+  }
+}

examples/helm3/params.libsonnet

@@ -0,0 +1,10 @@
+
+// this file returns the params for the current qbec environment
+local env = std.extVar('qbec.io/env');
+local paramsMap = import 'glob-import:environments/*.libsonnet';
+local baseFile = if env == '_' then 'base' else env;
+local key = 'environments/%s.libsonnet' % baseFile;
+
+if std.objectHas(paramsMap, key)
+then paramsMap[key]
+else error 'no param file %s found for environment %s' % [key, env]

examples/helm3/qbec.yaml

@@ -0,0 +1,22 @@
+apiVersion: qbec.io/v1alpha1
+kind: App
+metadata:
+  name: helm3
+spec:
+  environments:
+    default:
+      defaultNamespace: charts
+      context: kind
+  vars:
+    computed:
+      - name: helmSetup
+        code: |
+          {}
+      - name: victoria-config
+        code: |
+          (import 'components/victoria-metrics/datasource.libsonnet').config
+      - name: apache-config
+        code: |
+          (import 'components/apache/datasource.libsonnet').config
+  dataSources:
+    - helm3://helm?configVar=helmSetup

go.mod

@@ -12,6 +12,7 @@ require (
 	github.com/golang/protobuf v1.5.2
 	github.com/google/go-jsonnet v0.18.0
 	github.com/googleapis/gnostic v0.2.0
+	github.com/iancoleman/strcase v0.2.0
 	github.com/jonboulle/clockwork v0.1.0
 	github.com/mattn/go-isatty v0.0.14
 	github.com/pkg/errors v0.9.1

go.sum

@@ -412,6 +412,7 @@ github.com/hashicorp/serf v0.9.5/go.mod h1:UWDWwZeL5cuWDJdl0C6wrvrUwEqtQ4ZKBKKEN
 github.com/hashicorp/serf v0.9.6/go.mod h1:TXZNMjZQijwlDvp+r0b63xZ45H7JmCmgg4gpTwn9UV4=
 github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
+github.com/iancoleman/strcase v0.2.0 h1:05I4QRnGpI0m37iZQRuskXh+w77mr6Z41lwQzuHLwW0=
 github.com/iancoleman/strcase v0.2.0/go.mod h1:iwCmte+B7n89clKwxIoIXy/HfoL7AsD47ZCWhYzw7ho=
 github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
 github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=

vm/internal/ds/exec/exec.go

@@ -121,11 +121,11 @@ func (d *execSource) Init(p datasource.ConfigProvider) (fErr error) {
 	if err != nil {
 		return err
 	}
+	c.initDefaults()
 	err = c.assertValid()
 	if err != nil {
 		return err
 	}
-	c.initDefaults()
 	d.runner = newRunner(&c)
 	return nil
 }

vm/internal/ds/factory/datasource.go

@@ -21,6 +21,7 @@ import (
 	"github.com/pkg/errors"
 	"github.com/splunk/qbec/vm/internal/ds"
 	"github.com/splunk/qbec/vm/internal/ds/exec"
+	"github.com/splunk/qbec/vm/internal/ds/helm3"
 )
 
 // Create creates a new data source from the supplied URL.
@@ -35,6 +36,7 @@ func Create(u string) (ds.DataSourceWithLifecycle, error) {
 	scheme := parsed.Scheme
 	switch scheme {
 	case exec.Scheme:
+	case helm3.Scheme:
 	default:
 		return nil, fmt.Errorf("data source URL '%s', unsupported scheme '%s'", u, scheme)
 	}
@@ -52,6 +54,8 @@ func Create(u string) (ds.DataSourceWithLifecycle, error) {
 	switch scheme {
 	case exec.Scheme:
 		return makeLazy(exec.New(name, varName)), nil
+	case helm3.Scheme:
+		return makeLazy(helm3.New(name, varName)), nil
 	default:
 		return nil, fmt.Errorf("internal error: unable to create a data source for %s", u)
 	}