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helm/pkg/chart/loader/load.go

201 lines
5.9 KiB

/*
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 loader
import (
"bytes"
"log"
"os"
"path/filepath"
"strings"
"github.com/pkg/errors"
"sigs.k8s.io/yaml"
"helm.sh/helm/v3/pkg/chart"
)
// ChartLoader loads a chart.
type ChartLoader interface {
Load() (*chart.Chart, error)
}
// Loader returns a new ChartLoader appropriate for the given chart name
func Loader(name string) (ChartLoader, error) {
fi, err := os.Stat(name)
if err != nil {
return nil, err
}
if fi.IsDir() {
return DirLoader(name), nil
}
return FileLoader(name), nil
}
// Load takes a string name, tries to resolve it to a file or directory, and then loads it.
//
// This is the preferred way to load a chart. It will discover the chart encoding
// and hand off to the appropriate chart reader.
//
// If a .helmignore file is present, the directory loader will skip loading any files
// matching it. But .helmignore is not evaluated when reading out of an archive.
func Load(name string) (*chart.Chart, error) {
l, err := Loader(name)
if err != nil {
return nil, err
}
return l.Load()
}
// BufferedFile represents an archive file buffered for later processing.
type BufferedFile struct {
Name string
Data []byte
}
// LoadFiles loads from in-memory files.
func LoadFiles(files []*BufferedFile) (*chart.Chart, error) {
c := new(chart.Chart)
subcharts := make(map[string][]*BufferedFile)
// do not rely on assumed ordering of files in the chart and crash
// if Chart.yaml was not coming early enough to initialize metadata
for _, f := range files {
c.Raw = append(c.Raw, &chart.File{Name: f.Name, Data: f.Data})
if f.Name == "Chart.yaml" {
if c.Metadata == nil {
c.Metadata = new(chart.Metadata)
}
if err := yaml.Unmarshal(f.Data, c.Metadata); err != nil {
return c, errors.Wrap(err, "cannot load Chart.yaml")
}
// NOTE(bacongobbler): while the chart specification says that APIVersion must be set,
// Helm 2 accepted charts that did not provide an APIVersion in their chart metadata.
// Because of that, if APIVersion is unset, we should assume we're loading a v1 chart.
if c.Metadata.APIVersion == "" {
c.Metadata.APIVersion = chart.APIVersionV1
}
}
}
for _, f := range files {
switch {
case f.Name == "Chart.yaml":
// already processed
continue
case f.Name == "Chart.lock":
c.Lock = new(chart.Lock)
if err := yaml.Unmarshal(f.Data, &c.Lock); err != nil {
return c, errors.Wrap(err, "cannot load Chart.lock")
}
case f.Name == "values.yaml":
c.Values = make(map[string]interface{})
if err := yaml.Unmarshal(f.Data, &c.Values); err != nil {
return c, errors.Wrap(err, "cannot load values.yaml")
}
Feat/schema validation (#5350) * Add the Schema type and a function to read it * Added a function to read a schema from a file * Check that values.yaml matches schema This commit uses the gojsonschema package to validate a values.yaml file against a corresponding values.schema.yaml file. * Add functionality to generate a schema from a values.yaml * Add Schema to Chart and loader * Clean up implementation in chartutil * Add tests for helm install with schema * Add schema validation to helm lint * Clean up "matchSchema" * Modify error output * Add documentation * Fix a linter issue * Fix a test that broke during a rebase * Clean up documentation * Specify JSONSchema spec Since JSONSchema is still in a draft state as of this commit, we need to specify a particular version of the JSONSchema spec * Switch to using builtin functionality for file extensions * Switch to using a third-party library for JSON conversion * Use the constants from the gojsonschema package * Updates to unit tests * Minor change to avoid string cast * Remove JSON Schema generation * Change Schema type from map[string]interface{} to []byte * Convert all Schema YAML to JSON * Fix some tests that were broken by a rebase * Fix up YAML/JSON conversions * This checks subcharts for schema validation The final coalesced values for a given chart will be validated against that chart's schema, as well as any dependent subchart's schema * Add unit tests for ValidateAgainstSchema * Remove nonessential test files * Remove a misleading unit test The TestReadSchema unit test was simply testing the ReadValues function, which is already being validated in the TestReadValues unit test * Update documentation to reflect changes to subchart schemas
6 years ago
case f.Name == "values.schema.json":
c.Schema = f.Data
// Deprecated: requirements.yaml is deprecated use Chart.yaml.
// We will handle it for you because we are nice people
case f.Name == "requirements.yaml":
if c.Metadata == nil {
c.Metadata = new(chart.Metadata)
}
if c.Metadata.APIVersion != chart.APIVersionV1 {
log.Printf("Warning: Dependencies are handled in Chart.yaml since apiVersion \"v2\". We recommend migrating dependencies to Chart.yaml.")
}
if err := yaml.Unmarshal(f.Data, c.Metadata); err != nil {
return c, errors.Wrap(err, "cannot load requirements.yaml")
}
if c.Metadata.APIVersion == chart.APIVersionV1 {
c.Files = append(c.Files, &chart.File{Name: f.Name, Data: f.Data})
}
// Deprecated: requirements.lock is deprecated use Chart.lock.
case f.Name == "requirements.lock":
c.Lock = new(chart.Lock)
if err := yaml.Unmarshal(f.Data, &c.Lock); err != nil {
return c, errors.Wrap(err, "cannot load requirements.lock")
}
if c.Metadata == nil {
c.Metadata = new(chart.Metadata)
}
if c.Metadata.APIVersion == chart.APIVersionV1 {
c.Files = append(c.Files, &chart.File{Name: f.Name, Data: f.Data})
}
case strings.HasPrefix(f.Name, "templates/"):
c.Templates = append(c.Templates, &chart.File{Name: f.Name, Data: f.Data})
case strings.HasPrefix(f.Name, "charts/"):
if filepath.Ext(f.Name) == ".prov" {
c.Files = append(c.Files, &chart.File{Name: f.Name, Data: f.Data})
continue
}
fname := strings.TrimPrefix(f.Name, "charts/")
cname := strings.SplitN(fname, "/", 2)[0]
subcharts[cname] = append(subcharts[cname], &BufferedFile{Name: fname, Data: f.Data})
default:
c.Files = append(c.Files, &chart.File{Name: f.Name, Data: f.Data})
}
}
if c.Metadata == nil {
return c, errors.New("Chart.yaml file is missing")
}
if err := c.Validate(); err != nil {
return c, err
}
for n, files := range subcharts {
var sc *chart.Chart
var err error
switch {
case strings.IndexAny(n, "_.") == 0:
continue
case filepath.Ext(n) == ".tgz":
file := files[0]
if file.Name != n {
return c, errors.Errorf("error unpacking tar in %s: expected %s, got %s", c.Name(), n, file.Name)
}
// Untar the chart and add to c.Dependencies
sc, err = LoadArchive(bytes.NewBuffer(file.Data))
default:
// We have to trim the prefix off of every file, and ignore any file
// that is in charts/, but isn't actually a chart.
buff := make([]*BufferedFile, 0, len(files))
for _, f := range files {
parts := strings.SplitN(f.Name, "/", 2)
if len(parts) < 2 {
continue
}
f.Name = parts[1]
buff = append(buff, f)
}
sc, err = LoadFiles(buff)
}
if err != nil {
return c, errors.Wrapf(err, "error unpacking %s in %s", n, c.Name())
}
c.AddDependency(sc)
}
return c, nil
}