chartutil

package
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 Go to latest Published: Jun 21, 2019 License: Apache-2.0 Imports: 24 Imported by: 0

Documentation

Overview

Package chartutil contains tools for working with charts.

Charts are described in the protocol buffer definition (pkg/proto/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 'loader.Load`: 

chart, err := loader.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 'loader.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/chart' package directly.

Index

Examples

Constants

View Source 
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"
	// IngressFileName is the name of the example ingress file.
	IngressFileName = "ingress.yaml"
	// DeploymentName is the name of the example deployment file.
	DeploymentName = "deployment.yaml"
	// ServiceName is the name of the example service file.
	ServiceName = "service.yaml"
	// NotesName is the name of the example NOTES.txt file.
	NotesName = "NOTES.txt"
	// HelpersName is the name of the example NOTES.txt file.
	HelpersName = "_helpers.tpl"
)
View Source 
const GlobalKey = "global"

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

Variables

View Source 
var (
	// DefaultVersionSet is the default version set, which includes only Core V1 ("v1").
	DefaultVersionSet = allKnownVersions()

	// DefaultKubeVersion is the default kubernetes version
	DefaultKubeVersion = &version.Info{
		Major:      "1",
		Minor:      "9",
		GitVersion: "v1.9.0",
		GoVersion:  runtime.Version(),
		Compiler:   runtime.Compiler,
		Platform:   fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH),
	}

	// DefaultCapabilities is the default set of capabilities.
	DefaultCapabilities = &Capabilities{
		APIVersions: DefaultVersionSet,
		KubeVersion: DefaultKubeVersion,
	}
)

Functions

func CoalesceTables 

func CoalesceTables(dst, src map[string]interface{}) map[string]interface{}

CoalesceTables merges a source map into a destination map.

dest is considered authoritative.

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 CreateFrom 

func CreateFrom(chartfile *chart.Metadata, dest, src string) error

CreateFrom creates a new chart, but scaffolds it from the src chart.

func Expand 

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

Expand uncompresses and extracts a chart into the specified directory.

func ExpandFile 

func ExpandFile(dest, src string) error

ExpandFile expands the src file into the dest directory.

func FromJSON 

func FromJSON(str string) map[string]interface{}

FromJSON converts a JSON document into a map[string]interface{}.

This is not a general-purpose JSON parser, and will not parse all valid JSON documents. Additionally, because its intended use is within templates it tolerates errors. It will insert the returned error message string into m["Error"] in the returned map.

func FromYAML 

func FromYAML(str string) map[string]interface{}

FromYAML converts a YAML document into a map[string]interface{}.

This is not a general-purpose YAML parser, and will not parse all valid YAML documents. Additionally, because its intended use is within templates it tolerates errors. It will insert the returned error message string into m["Error"] in the returned map.

func IsChartDir 

func IsChartDir(dirName string) (bool, error)

IsChartDir validate a chart directory.

Checks for a valid Chart.yaml.

func IsChartInstallable 

func IsChartInstallable(chart *chart.Chart) (bool, error)

IsChartInstallable validates if a chart can be installed

Application chart type is only installable

func IsValidChartType 

func IsValidChartType(chart *chart.Chart) (bool, error)

IsValidChartType validates the chart type

Valid types are: application or library

func LoadChartfile 

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

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

func ProcessDependencies 

func ProcessDependencies(c *chart.Chart, v Values) error

ProcessDependencies checks through this chart's dependencies, processing accordingly.

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 SaveDir 

func SaveDir(c *chart.Chart, dest string) error

SaveDir saves a chart as files in a directory.

func ToJSON 

func ToJSON(v interface{}) string

ToJSON takes an interface, marshals it to json, and returns a string. It will always return a string, even on marshal error (empty string).

This is designed to be called from a template.

func ToTOML 

func ToTOML(v interface{}) string

ToTOML takes an interface, marshals it to toml, and returns a string. It will always return a string, even on marshal error (empty string).

This is designed to be called from a template.

func ToYAML 

func ToYAML(v interface{}) string

ToYAML takes an interface, marshals it to yaml, and returns a string. It will always return a string, even on marshal error (empty string).

This is designed to be called from a template.

Types

type Capabilities 

type Capabilities struct {
	// List of all supported API versions
	APIVersions VersionSet
	// KubeVerison is the Kubernetes version
	KubeVersion *version.Info
}

Capabilities describes the capabilities of the Kubernetes cluster that Tiller is attached to.

type ErrNoTable 

type ErrNoTable string

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

func (ErrNoTable) Error 

func (e ErrNoTable) Error() string

type ErrNoValue 

type ErrNoValue string

ErrNoValue indicates that Values does not contain a key with a value

func (ErrNoValue) Error 

func (e ErrNoValue) Error() string

type Files 

type Files map[string][]byte

Files is a map of files in a chart that can be accessed from a template.

func NewFiles 

func NewFiles(from []*chart.File) Files

NewFiles creates a new Files from chart files. Given an []*any.Any (the format for files in a chart.Chart), extract a map of files.

func (Files) AsConfig 

func (f Files) AsConfig() string

AsConfig turns a Files group and flattens it to a YAML map suitable for including in the 'data' section of a Kubernetes ConfigMap definition. Duplicate keys will be overwritten, so be aware that your file names (regardless of path) should be unique.

This is designed to be called from a template, and will return empty string (via ToYAML function) if it cannot be serialized to YAML, or if the Files object is nil.

The output will not be indented, so you will want to pipe this to the 'indent' template function. 

data:

{{ .Files.Glob("config/**").AsConfig() | indent 4 }}

func (Files) AsSecrets 

func (f Files) AsSecrets() string

AsSecrets returns the base64-encoded value of a Files object suitable for including in the 'data' section of a Kubernetes Secret definition. Duplicate keys will be overwritten, so be aware that your file names (regardless of path) should be unique.

This is designed to be called from a template, and will return empty string (via ToYAML function) if it cannot be serialized to YAML, or if the Files object is nil.

The output will not be indented, so you will want to pipe this to the 'indent' template function. 

data:

{{ .Files.Glob("secrets/*").AsSecrets() }}

func (Files) Get 

func (f Files) Get(name string) string

Get returns a string representation of the given file.

Fetch the contents of a file as a string. It is designed to be called in a template. 

{{.Files.Get "foo"}}

func (Files) GetBytes 

func (f Files) GetBytes(name string) []byte

GetBytes gets a file by path.

The returned data is raw. In a template context, this is identical to calling {{index .Files $path}}.

This is intended to be accessed from within a template, so a missed key returns an empty []byte.

func (Files) Glob 

func (f Files) Glob(pattern string) Files

Glob takes a glob pattern and returns another files object only containing matched files.

This is designed to be called from a template.

{{ range $name, $content := .Files.Glob("foo/**") }} {{ $name }}: | {{ .Files.Get($name) | indent 4 }}{{ end }}

func (Files) Lines 

func (f Files) Lines(path string) []string

Lines returns each line of a named file (split by "\n") as a slice, so it can be ranged over in your templates.

This is designed to be called from a template.

{{ range .Files.Lines "foo/bar.html" }} {{ . }}{{ end }}

type ReleaseOptions 

type ReleaseOptions struct {
	Name      string
	Time      time.Time
	Namespace string
	IsUpgrade bool
	IsInstall bool
	Revision  int
}

ReleaseOptions represents the additional release options needed for the composition of the final values struct

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 map[string]interface{}) (Values, error)

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

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 ToRenderValues 

func ToRenderValues(chrt *chart.Chart, chrtVals map[string]interface{}, options ReleaseOptions, caps *Capabilities) (Values, error)

ToRenderValues composes the struct from the data coming from the Releases, Charts and Values files

This takes both ReleaseOptions and Capabilities to merge into the render 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) PathValue 

func (v Values) PathValue(path string) (interface{}, error)

PathValue takes a path that traverses a YAML structure and returns the value at the end of that path. The path starts at the root of the YAML structure and is comprised of YAML keys separated by periods. Given the following YAML data the value at path "chapter.one.title" is "Loomings". 

chapter:
  one:
    title: "Loomings"

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.

type VersionSet 

type VersionSet map[string]struct{}

VersionSet is a set of Kubernetes API versions.

func NewVersionSet 

func NewVersionSet(apiVersions ...string) VersionSet

NewVersionSet creates a new version set from a list of strings.

func (VersionSet) Has 

func (v VersionSet) Has(apiVersion string) bool

Has returns true if the version string is in the set. 

vs.Has("extensions/v1beta1")

Source Files

View all Source files

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