Support templated packages

pkg/helpers/helm.go

@@ -0,0 +1,34 @@
+package helpers
+
+import (
+
+	"helm.sh/helm/v3/pkg/chart"
+	"helm.sh/helm/v3/pkg/chartutil"
+	"helm.sh/helm/v3/pkg/engine"
+	"github.com/pkg/errors"
+)
+
+// RenderHelm renders the template string with helm
+func RenderHelm(template string, values map[string]interface{}) (string,error) {
+	c := &chart.Chart{
+		Metadata: &chart.Metadata{
+			Name:    "",
+			Version: "",
+		},
+		Templates: []*chart.File{
+			{Name: "templates", Data: []byte(template)},
+		},
+		Values:    map[string]interface{}{"Values":values},
+	}
+
+	v, err := chartutil.CoalesceValues(c, map[string]interface{}{})
+	if err != nil {
+		return "",errors.Wrap(err,"while rendering template")
+	}
+	out, err := engine.Render(c, v)
+	if err != nil {
+		return "",errors.Wrap(err,"while rendering template")
+	}
+
+	return out["templates"],nil
+}

pkg/helpers/helm_test.go

@@ -0,0 +1,32 @@
+// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package helpers_test
+
+import (
+	. "github.com/mudler/luet/pkg/helpers"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Helpers", func() {
+	Context("RenderHelm", func() {
+		It("Renders templates", func() {
+			out, err := RenderHelm("{{.Values.Test}}",map[string]interface{}{"Test":"foo"})
+			Expect(err).ToNot(HaveOccurred())
+			Expect(out).To(Equal("foo"))
+		})
+	})
+})