Initial v1.0.0 commit

vendor/k8s.io/helm/pkg/chartutil/chartfile.go

@@ -0,0 +1,98 @@
+/*
+Copyright The Helm 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 chartutil
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/ghodss/yaml"
+
+	"k8s.io/helm/pkg/proto/hapi/chart"
+)
+
+// ApiVersionV1 is the API version number for version 1.
+//
+// This is ApiVersionV1 instead of APIVersionV1 to match the protobuf-generated name.
+const ApiVersionV1 = "v1" // nolint
+
+// UnmarshalChartfile takes raw Chart.yaml data and unmarshals it.
+func UnmarshalChartfile(data []byte) (*chart.Metadata, error) {
+	y := &chart.Metadata{}
+	err := yaml.Unmarshal(data, y)
+	if err != nil {
+		return nil, err
+	}
+	return y, nil
+}
+
+// LoadChartfile loads a Chart.yaml file into a *chart.Metadata.
+func LoadChartfile(filename string) (*chart.Metadata, error) {
+	b, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+	return UnmarshalChartfile(b)
+}
+
+// SaveChartfile saves the given metadata as a Chart.yaml file at the given path.
+//
+// 'filename' should be the complete path and filename ('foo/Chart.yaml')
+func SaveChartfile(filename string, cf *chart.Metadata) error {
+	out, err := yaml.Marshal(cf)
+	if err != nil {
+		return err
+	}
+	return ioutil.WriteFile(filename, out, 0644)
+}
+
+// IsChartDir validate a chart directory.
+//
+// Checks for a valid Chart.yaml.
+func IsChartDir(dirName string) (bool, error) {
+	if fi, err := os.Stat(dirName); err != nil {
+		return false, err
+	} else if !fi.IsDir() {
+		return false, fmt.Errorf("%q is not a directory", dirName)
+	}
+
+	chartYaml := filepath.Join(dirName, "Chart.yaml")
+	if _, err := os.Stat(chartYaml); os.IsNotExist(err) {
+		return false, fmt.Errorf("no Chart.yaml exists in directory %q", dirName)
+	}
+
+	chartYamlContent, err := ioutil.ReadFile(chartYaml)
+	if err != nil {
+		return false, fmt.Errorf("cannot read Chart.Yaml in directory %q", dirName)
+	}
+
+	chartContent, err := UnmarshalChartfile(chartYamlContent)
+	if err != nil {
+		return false, err
+	}
+	if chartContent == nil {
+		return false, errors.New("chart metadata (Chart.yaml) missing")
+	}
+	if chartContent.Name == "" {
+		return false, errors.New("invalid chart (Chart.yaml): name must not be empty")
+	}
+
+	return true, nil
+}