chartutil

package
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 Go to latest Published: Apr 28, 2020 License: Apache-2.0 Imports: 30 Imported by: 10

Documentation

Overview

Package chartutil contains tools for working with charts.

Charts are described in the protocol buffer definition (pkg/proto/hapi/charts). This package 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 utilities 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/hapi/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"
	// ServiceAccountName is the name of the example serviceaccount file.
	ServiceAccountName = "serviceaccount.yaml"
	// NotesName is the name of the example NOTES.txt file.
	NotesName = "NOTES.txt"
	// HelpersName is the name of the example helpers file.
	HelpersName = "_helpers.tpl"
	// TemplatesTestsDir is the relative directory name for templates tests.
	TemplatesTestsDir = "templates/tests"
	// TestConnectionName is the name of the example connection test file.
	TestConnectionName = "test-connection.yaml"
)
View Source 
const ApiVersionV1 = "v1" // nolint

ApiVersionV1 is the API version number for version 1.

This is ApiVersionV1 instead of APIVersionV1 to match the protobuf-generated name.

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 in included in Kubernetes for workloads
	// Default versions as of Kubernetes 1.14
	DefaultVersionSet = NewVersionSet(defaultVersions()...)

	// DefaultKubeVersion is the default kubernetes version
	DefaultKubeVersion = &version.Info{
		Major:      "1",
		Minor:      "14",
		GitVersion: "v1.14.0",
		GoVersion:  runtime.Version(),
		Compiler:   runtime.Compiler,
		Platform:   fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH),
	}
)
View Source 
var (
	// ErrRequirementsNotFound indicates that a requirements.yaml is not found.
	ErrRequirementsNotFound = errors.New(requirementsName + " not found")
	// ErrLockfileNotFound indicates that a requirements.lock is not found.
	ErrLockfileNotFound = errors.New(lockfileName + " not found")
)

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 CreateFrom 

func CreateFrom(chartfile *chart.Metadata, dest string, 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. TODO: change the function signature in Helm 3

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 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 LoadFiles 

func LoadFiles(files []*BufferedFile) (*chart.Chart, error)

LoadFiles loads from in-memory files.

func ProcessRequirementsConditions 

func ProcessRequirementsConditions(reqs *Requirements, cvals Values, cpath string)

ProcessRequirementsConditions disables charts based on condition path value in values

func ProcessRequirementsEnabled 

func ProcessRequirementsEnabled(c *chart.Chart, v *chart.Config) error

ProcessRequirementsEnabled removes disabled charts from dependencies

func ProcessRequirementsImportValues 

func ProcessRequirementsImportValues(c *chart.Chart) error

ProcessRequirementsImportValues imports specified chart values from child to parent.

func ProcessRequirementsTags 

func ProcessRequirementsTags(reqs *Requirements, cvals Values)

ProcessRequirementsTags disables charts based on tags in values

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. TODO: change the function signature in Helm 3

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.

func Transform 

func Transform(src string, key string, replacement string) []byte

Transform performs a string replacement of the specified source for a given key with the replacement string

func UnmarshalChartfile 

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

UnmarshalChartfile takes raw Chart.yaml data and unmarshals it.

Types

type BufferedFile 

type BufferedFile struct {
	Name string
	Data []byte
}

BufferedFile represents an archive file buffered for later processing.

type Capabilities 

type Capabilities struct {
	// APIVersions list of all supported API versions
	APIVersions VersionSet
	// KubeVersion is the Kubernetes version
	KubeVersion *version.Info
	// TillerVersion is the Tiller version
	//
	// This always comes from pkg/version.GetVersionProto().
	TillerVersion *tversion.Version
}

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

type Dependency 

type Dependency struct {
	// Name is the name of the dependency.
	//
	// This must match the name in the dependency's Chart.yaml.
	Name string `json:"name"`
	// Version is the version (range) of this chart.
	//
	// A lock file will always produce a single version, while a dependency
	// may contain a semantic version range.
	Version string `json:"version,omitempty"`
	// The URL to the repository.
	//
	// Appending `index.yaml` to this string should result in a URL that can be
	// used to fetch the repository index.
	Repository string `json:"repository"`
	// A yaml path that resolves to a boolean, used for enabling/disabling charts (e.g. subchart1.enabled )
	Condition string `json:"condition,omitempty"`
	// Tags can be used to group charts for enabling/disabling together
	Tags []string `json:"tags,omitempty"`
	// Enabled bool determines if chart should be loaded
	Enabled bool `json:"enabled,omitempty"`
	// ImportValues holds the mapping of source values to parent key to be imported. Each item can be a
	// string or pair of child/parent sublist items.
	ImportValues []interface{} `json:"import-values,omitempty"`
	// Alias usable alias to be used for the chart
	Alias string `json:"alias,omitempty"`
}

Dependency describes a chart upon which another chart depends.

Dependencies can be used to express developer intent, or to capture the state of a chart.

type ErrNoRequirementsFile 

type ErrNoRequirementsFile error

ErrNoRequirementsFile to detect error condition

type ErrNoTable 

type ErrNoTable error

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

type ErrNoValue 

type ErrNoValue error

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

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 []*any.Any) 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      *timestamp.Timestamp
	Namespace string
	IsUpgrade bool
	IsInstall bool
	Revision  int
}

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

type Requirements 

type Requirements struct {
	Dependencies []*Dependency `json:"dependencies"`
}

Requirements is a list of requirements for a chart.

Requirements are charts upon which this chart depends. This expresses developer intent.

func LoadRequirements 

func LoadRequirements(c *chart.Chart) (*Requirements, error)

LoadRequirements loads a requirements file from an in-memory chart.

type RequirementsLock 

type RequirementsLock struct {
	// Generated is the date the lock file was last generated.
	Generated time.Time `json:"generated"`
	// Digest is a hash of the requirements file used to generate it.
	Digest string `json:"digest"`
	// Dependencies is the list of dependencies that this lock file has locked.
	Dependencies []*Dependency `json:"dependencies"`
}

RequirementsLock is a lock file for requirements.

It represents the state that the dependencies should be in.

func LoadRequirementsLock 

func LoadRequirementsLock(c *chart.Chart) (*RequirementsLock, error)

LoadRequirementsLock loads a requirements lock file.

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) (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 *chart.Config, options ReleaseOptions) (Values, error)

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

WARNING: This function is deprecated for Helm > 2.1.99 Use ToRenderValuesCaps() instead. It will remain in the codebase to stay SemVer compliant.

In Helm 3.0, this will be changed to accept Capabilities as a fourth parameter.

func ToRenderValuesCaps 

func ToRenderValuesCaps(chrt *chart.Chart, chrtVals *chart.Config, options ReleaseOptions, caps *Capabilities) (Values, error)

ToRenderValuesCaps 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) MergeInto 

func (v Values) MergeInto(src Values)

MergeInto takes the properties in src and merges them into Values. Maps are merged while values and arrays are replaced.

func (Values) PathValue 

func (v Values) PathValue(ypath 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]interface{}

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")

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