chartutil

Documentation

Overview

Package chartutil contains tools for working with charts.

Charts are described in the protocol buffer definition (pkg/proto/hapi/charts). This packe provides utilities for serializing and deserializing charts.

A chart can be represented on the file system in one of two ways:

• As a directory that contains a Chart.yaml file and other chart things.
• As a tarred gzipped file containing a directory that then contains a Chart.yaml file.

This package provides utilitites for working with those file formats.

The preferred way of loading a chart is using 'chartutil.Load`:

chart, err := chartutil.Load(filename)

This will attempt to discover whether the file at 'filename' is a directory or a chart archive. It will then load accordingly.

For accepting raw compressed tar file data from an io.Reader, the 'chartutil.LoadArchive()' will read in the data, uncompress it, and unpack it into a Chart.

When creating charts in memory, use the 'k8s.io/helm/pkg/proto/happy/chart' package directly.

Index

• Constants
• Variables
• func Create(chartfile *chart.Metadata, dir string) (string, error)
• func Expand(dir string, r io.Reader) error
• func Load(name string) (*chart.Chart, error)
• func LoadArchive(in io.Reader) (*chart.Chart, error)
• func LoadChartfile(filename string) (*chart.Metadata, error)
• func LoadDir(dir string) (*chart.Chart, error)
• func LoadFile(name string) (*chart.Chart, error)
• func Save(c *chart.Chart, outDir string) (string, error)
• func SaveChartfile(filename string, cf *chart.Metadata) error
• func UnmarshalChartfile(data []byte) (*chart.Metadata, error)
• type Values
  • func CoalesceValues(chrt *chart.Chart, vals *chart.Config, overrides map[string]interface{}) (Values, error)
  • func ReadValues(data []byte) (vals Values, err error)
  • func ReadValuesFile(filename string) (Values, error)
  • func (v Values) AsMap() map[string]interface{}
  • func (v Values) Encode(w io.Writer) error
  • func (v Values) Table(name string) (Values, error)
  • func (v Values) YAML() (string, error)

Examples

• Values

Constants

const (
	// ChartfileName is the default Chart file name.
	ChartfileName = "Chart.yaml"
	// ValuesfileName is the default values file name.
	ValuesfileName = "values.yaml"
	// TemplatesDir is the relative directory name for templates.
	TemplatesDir = "templates"
	// ChartsDir is the relative directory name for charts dependencies.
	ChartsDir = "charts"
	// IgnorefileName is the name of the Helm ignore file.
	IgnorefileName = ".helmignore"
)

const GlobalKey = "global"

GlobalKey is the name of the Values key that is used for storing global vars.

Variables

var ErrNoTable = errors.New("no table")

ErrNoTable indicates that a chart does not have a matching table.

Functions

func Create

func Create(chartfile *chart.Metadata, dir string) (string, error)

Create creates a new chart in a directory.

Inside of dir, this will create a directory based on the name of chartfile.Name. It will then write the Chart.yaml into this directory and create the (empty) appropriate directories.

The returned string will point to the newly created directory. It will be an absolute path, even if the provided base directory was relative.

If dir does not exist, this will return an error. If Chart.yaml or any directories cannot be created, this will return an error. In such a case, this will attempt to clean up by removing the new chart directory.

func Expand

func Expand(dir string, r io.Reader) error

Expand uncompresses and extracts a chart into the specified directory.

func Load

func Load(name string) (*chart.Chart, error)

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 LoadArchive

func LoadArchive(in io.Reader) (*chart.Chart, error)

LoadArchive loads from a reader containing a compressed tar archive.

func LoadChartfile

func LoadChartfile(filename string) (*chart.Metadata, error)

LoadChartfile loads a Chart.yaml file into a *chart.Metadata.

func LoadDir

func LoadDir(dir string) (*chart.Chart, error)

LoadDir loads from a directory.

This loads charts only from directories.

func LoadFile

func LoadFile(name string) (*chart.Chart, error)

LoadFile loads from an archive file.

func Save

func Save(c *chart.Chart, outDir string) (string, error)

Save creates an archived chart to the given directory.

This takes an existing chart and a destination directory.

If the directory is /foo, and the chart is named bar, with version 1.0.0, this will generate /foo/bar-1.0.0.tgz.

This returns the absolute path to the chart archive file.

func SaveChartfile

func SaveChartfile(filename string, cf *chart.Metadata) error

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 UnmarshalChartfile

func UnmarshalChartfile(data []byte) (*chart.Metadata, error)

UnmarshalChartfile takes raw Chart.yaml data and unmarshals it.

Types

type Values

type Values map[string]interface{}

Values represents a collection of chart values.

Example

doc := `
title: "Moby Dick"
chapter:
  one:
    title: "Loomings"
  two:
    title: "The Carpet-Bag"
  three:
    title: "The Spouter Inn"
`
d, err := ReadValues([]byte(doc))
if err != nil {
	panic(err)
}
ch1, err := d.Table("chapter.one")
if err != nil {
	panic("could not find chapter one")
}
fmt.Print(ch1["title"])

Output:

Loomings

func CoalesceValues

func CoalesceValues(chrt *chart.Chart, vals *chart.Config, overrides map[string]interface{}) (Values, error)

CoalesceValues coalesces all of the values in a chart (and its subcharts).

The overrides map may be used to specifically override configuration values.

Values are coalesced together using the following rules:

• Values in a higher level chart always override values in a lower-level dependency chart
• Scalar values and arrays are replaced, maps are merged
• A chart has access to all of the variables for it, as well as all of the values destined for its dependencies.

func ReadValues

func ReadValues(data []byte) (vals Values, err error)

ReadValues will parse YAML byte data into a Values.

func ReadValuesFile

func ReadValuesFile(filename string) (Values, error)

ReadValuesFile will parse a YAML file into a map of values.

func (Values) AsMap

func (v Values) AsMap() map[string]interface{}

AsMap is a utility function for converting Values to a map[string]interface{}.

It protects against nil map panics.

func (Values) Encode

func (v Values) Encode(w io.Writer) error

Encode writes serialized Values information to the given io.Writer.

func (Values) Table

func (v Values) Table(name string) (Values, error)

Table gets a table (YAML subsection) from a Values object.

The table is returned as a Values.

Compound table names may be specified with dots:

foo.bar

The above will be evaluated as "The table bar inside the table foo".

An ErrNoTable is returned if the table does not exist.

func (Values) YAML

func (v Values) YAML() (string, error)

YAML encodes the Values into a YAML string.