libpak

package module
v2.0.0-alpha.3 Latest Latest
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 Go to latest Published: Sep 6, 2023 License: Apache-2.0 Imports: 24 Imported by: 2

README

github.com/paketo-buildpacks/libpak

libpak is a Go library with useful functionality for building Paketo-style buildpacks.

Usage

go get github.com/paketo-buildpacks/libpak

License

This library is released under version 2.0 of the Apache License.

Documentation

Index

Constants

View Source 
const (
	// BionicStackID is the ID for the Cloud Native Buildpacks bionic stack.
	BionicStackID = "io.buildpacks.stacks.bionic"

	// BionicTinyStackID is the ID for the Paketo Buildpacks bionic tiny stack.
	BionicTinyStackID = "io.paketo.stacks.tiny"

	// TinyStackID is the ID for the Paketo Buildpacks bionic tiny stack.
	//
	// Deprecated: use BionicTinyStackID instead
	TinyStackID = "io.paketo.stacks.tiny"

	// JammyStackID is the ID for the Cloud Native Buildpacks jammy stack.
	JammyStackID = "io.buildpacks.stacks.jammy"

	// JammyTinyStackID is the ID for the Cloud Native Buildpacks jammy tiny stack.
	JammyTinyStackID = "io.buildpacks.stacks.jammy.tiny"

	// JammyStaticStackID is the ID for the Cloud Native Buildpacks jammy static stack.
	JammyStaticStackID = "io.buildpacks.stacks.jammy.static"
)

Variables

This section is empty.

Functions

func Build 

func Build(builder libcnb.BuildFunc, options ...libcnb.Option)

Build is called by the main function of a buildpack, for build.

func BuildpackMain 

func BuildpackMain(detect libcnb.DetectFunc, build libcnb.BuildFunc, options ...libcnb.Option)

Main is called by the main function of a buildpack, encapsulating both detection and build in the same binary.

func ContributableBuildFunc 

func ContributableBuildFunc(contributeLayersFunc ContributeLayersFunc) libcnb.BuildFunc

ContributableBuildFunc is a standard libcnb.BuildFunc implementation that delegates to a list of Contributables

func Detect 

func Detect(detector libcnb.DetectFunc, options ...libcnb.Option)

Detect is called by the main function of a buildpack, for detection.

func ExtensionMain 

func ExtensionMain(detect libcnb.DetectFunc, generate libcnb.GenerateFunc, options ...libcnb.Option)

Main is called by the main function of an extension, encapsulating both detection and generation in the same binary.

func Generate 

func Generate(generator libcnb.GenerateFunc, options ...libcnb.Option)

Generate is called by the main function of an extension, for generation.

func IsBionicStack 

func IsBionicStack(stack string) bool

IsBionicStack returns true if the stack is one of the bionic variants

func IsJammyStack 

func IsJammyStack(stack string) bool

IsJammyStack returns true if the stack is one of the jammy variants

func IsNoValidDependencies 

func IsNoValidDependencies(err error) bool

IsNoValidDependencies indicates whether an error is a NoValidDependenciesError.

func IsShellPresentOnStack 

func IsShellPresentOnStack(stack string) bool

IsShellPresentOnStack returns true if the stack is known to have a shell

func IsStaticStack 

func IsStaticStack(stack string) bool

IsStaticStack returns true if the stack is one of the static variants

func IsTinyStack 

func IsTinyStack(stack string) bool

IsTinyStack returns true if the stack is one of the tiny variants

func ShallowMerge 

func ShallowMerge(a, b libcnb.BuildpackPlanEntry) (libcnb.BuildpackPlanEntry, error)

ShallowMerge merges two BuildpackPlanEntry's together. Declared versions are combined with a comma delimiter and metadata is combined with the values for b taking priority over the values of a when the keys are duplicated.

Types

type BuildModuleConfiguration 

type BuildModuleConfiguration struct {

	// Build indicates whether the configuration is for build-time.  Optional.
	Build bool `toml:"build"`

	// Default is the default value of the configuration parameter.  Optional.
	Default string `toml:"default"`

	// Description is the description of the configuration parameter.
	Description string `toml:"description"`

	// Launch indicates whether the configuration is for launch-time.  Optional.
	Launch bool `toml:"launch"`

	// Name is the environment variable name of the configuration parameter.
	Name string `toml:"name"`
}

BuildpackConfiguration represents a build or launch configuration parameter.

type BuildModuleDependency 

type BuildModuleDependency struct {
	// ID is the dependency ID.
	ID string `toml:"id"`

	// Name is the dependency name.
	Name string `toml:"name"`

	// Version is the dependency version.
	Version string `toml:"version"`

	// URI is the dependency URI.
	URI string `toml:"uri"`

	// SHA256 is the hash of the dependency.
	SHA256 string `toml:"sha256"`

	// Stacks are the stacks the dependency is compatible with.
	Stacks []string `toml:"stacks"`

	// Licenses are the licenses the dependency is distributed under.
	Licenses []BuildModuleDependencyLicense `toml:"licenses"`

	// CPEs are the Common Platform Enumeration identifiers for the dependency
	CPEs []string `toml:"cpes"`

	// PURL is the package URL that identifies the dependency
	PURL string `toml:"purl"`

	// DeprecationDate is the time when the dependency is deprecated
	DeprecationDate time.Time `toml:"deprecation_date"`
}

BuildModuleDependency describes a dependency known to the buildpack/extension

func (BuildModuleDependency) AsSyftArtifact 

func (b BuildModuleDependency) AsSyftArtifact(source string) (sbom.SyftArtifact, error)

AsSyftArtifact renders a bill of materials entry describing the dependency as Syft.

func (BuildModuleDependency) Equals 

func (b1 BuildModuleDependency) Equals(b2 BuildModuleDependency) bool

Equals compares the 2 structs if they are equal. This is very simiar to reflect.DeepEqual except that properties that will not work (e.g. DeprecationDate) are ignored.

func (BuildModuleDependency) IsDeprecated 

func (b BuildModuleDependency) IsDeprecated() bool

func (BuildModuleDependency) IsSoonDeprecated 

func (b BuildModuleDependency) IsSoonDeprecated() bool

type BuildModuleDependencyLicense 

type BuildModuleDependencyLicense struct {

	// Type is the type of the license.  This is typically the SPDX short identifier.
	Type string `toml:"type"`

	// URI is the location where the license can be found.
	URI string `toml:"uri"`
}

BuildModuleDependencyLicense represents a license that a BuildModuleDependency is distributed under. At least one of Name or URI MUST be specified.

type BuildModuleMetadata 

type BuildModuleMetadata struct {

	// Configurations are environment variables that can be used at build time to configure the buildpack and launch
	// time to configure the application.
	Configurations []BuildModuleConfiguration

	// Dependencies are the dependencies known to the buildpack.
	Dependencies []BuildModuleDependency

	// IncludeFiles describes the files to include in the package.
	IncludeFiles []string

	// PrePackage describes a command to invoke before packaging.
	PrePackage string
}

BuildpackMetadata is an extension to libcnb.Buildpack / libcnb.Extension's metadata with opinions.

func NewBuildModuleMetadata 

func NewBuildModuleMetadata(metadata map[string]interface{}) (BuildModuleMetadata, error)

NewBuildpackMetadata creates a new instance of BuildpackMetadata from the contents of libcnb.Buildpack.Metadata

type ConfigurationResolver 

type ConfigurationResolver struct {
	// Configurations are the configurations to resolve against
	Configurations []BuildModuleConfiguration
}

ConfigurationResolver provides functionality for resolving a configuration value.

func NewConfigurationResolver 

func NewConfigurationResolver(md BuildModuleMetadata) (ConfigurationResolver, error)

NewConfigurationResolver creates a new instance from buildmodule metadata.

func (*ConfigurationResolver) LogConfiguration 

func (c *ConfigurationResolver) LogConfiguration(logger log.Logger)

LogConfiguration will write the configuration options to the body level in the form 'Set $Name to configure $Description[. Default <i>$Default</i>.]'.

func (*ConfigurationResolver) Resolve 

func (c *ConfigurationResolver) Resolve(name string) (string, bool)

Resolve resolves the value for a configuration option, returning the default value and false if it was not set.

func (*ConfigurationResolver) ResolveBool 

func (c *ConfigurationResolver) ResolveBool(name string) bool

ResolveBool resolves a boolean value for a configuration option. Returns true for 1, t, T, TRUE, true, True. Returns false for all other values or unset.

type Contributable 

type Contributable interface {
	// Contribute accepts a new empty layer and transforms it
	Contribute(layer *libcnb.Layer) error

	// Name is the name of the layer.
	Name() string
}

Contributable is an interface that is implemented when you want to contribute new layers

type ContributeLayersFunc 

type ContributeLayersFunc func(context libcnb.BuildContext, result *libcnb.BuildResult) ([]Contributable, error)

ContributeLayersFunc takes a context and result pointer returning a list of Contributables, the list of Contributables will be turned into layers automatically

type DependenciesFormatter 

type DependenciesFormatter []BuildModuleDependency

DependenciesFormatter is the formatter for a []BuildpackDependency.

func (DependenciesFormatter) String 

func (d DependenciesFormatter) String() string

type DependencyCache 

type DependencyCache struct {
	// CachePath is the location where the buildmodule has cached its dependencies.
	CachePath string

	// DownloadPath is the location of all downloads during this execution of the build.
	DownloadPath string

	// Logger is the logger used to write to the console.
	Logger log.Logger

	// UserAgent is the User-Agent string to use with requests.
	UserAgent string

	// Mappings optionally provides URIs mapping for BuildModuleDependencies
	Mappings map[string]string

	// httpClientTimeouts contains the timeout values used by HTTP client
	HttpClientTimeouts HttpClientTimeouts
}

DependencyCache allows a user to get an artifact either from a buildmodule's cache, a previous download, or to download directly.

func NewDependencyCache 

func NewDependencyCache(buildModuleID string, buildModuleVersion string, buildModulePath string, platformBindings libcnb.Bindings, logger log.Logger) (DependencyCache, error)

NewDependencyCache creates a new instance setting the default cache path (<BUILDMODULE_PATH>/dependencies) and user agent (<BUILDMODULE_ID>/<BUILDMODULE_VERSION>).

func (*DependencyCache) Artifact 

func (d *DependencyCache) Artifact(dependency BuildModuleDependency, mods ...RequestModifierFunc) (*os.File, error)

Artifact returns the path to the artifact. Resolution of that path follows three tiers:

1. CachePath 2. DownloadPath 3. Download from URI

If the BuildpackDependency's SHA256 is not set, the download can never be verified to be up to date and will always download, skipping all the caches.

type DependencyLayerContributor 

type DependencyLayerContributor struct {
	// Dependency is the dependency being contributed.
	Dependency BuildModuleDependency

	// DependencyCache is the cache to use to get the dependency.
	DependencyCache DependencyCache

	// ExpectedTypes indicates the types that should be set on the layer.
	ExpectedTypes libcnb.LayerTypes

	// ExpectedMetadata contains metadata describing the expected layer
	ExpectedMetadata interface{}

	// Logger is the logger to use.
	Logger log.Logger

	// RequestModifierFuncs is an optional Request Modifier to use when downloading the dependency.
	RequestModifierFuncs []RequestModifierFunc
}

DependencyLayerContributor is a helper for implementing a Contributable for a BuildpackDependency in order to get consistent logging and avoidance.

func NewDependencyLayerContributor 

func NewDependencyLayerContributor(dependency BuildModuleDependency, cache DependencyCache, types libcnb.LayerTypes, logger log.Logger) DependencyLayerContributor

NewDependencyLayerContributor returns a new DependencyLayerContributor for the given BuildpackDependency

func (*DependencyLayerContributor) Contribute 

func (d *DependencyLayerContributor) Contribute(layer *libcnb.Layer, f DependencyLayerFunc) error

Contribute is the function to call whe implementing your Contributable.

func (*DependencyLayerContributor) LayerName 

func (d *DependencyLayerContributor) LayerName() string

LayerName returns the conventional name of the layer for this contributor

func (*DependencyLayerContributor) Name 

func (d *DependencyLayerContributor) Name() string

Name returns the human readable name of the layer

type DependencyLayerFunc 

type DependencyLayerFunc func(layer *libcnb.Layer, artifact *os.File) error

DependencyLayerFunc is a callback function that is invoked when a dependency needs to be contributed.

type DependencyResolver 

type DependencyResolver struct {

	// Dependencies are the dependencies to resolve against.
	Dependencies []BuildModuleDependency

	// StackID is the stack id of the build.
	StackID string

	// Logger is the logger used to write to the console.
	Logger log.Logger
}

DependencyResolver provides functionality for resolving a dependency given a collection of constraints.

func NewDependencyResolver 

func NewDependencyResolver(md BuildModuleMetadata, stackId string) (DependencyResolver, error)

NewDependencyResolver creates a new instance from the build module metadata and stack id.

func (*DependencyResolver) Resolve 

func (d *DependencyResolver) Resolve(id string, version string) (BuildModuleDependency, error)

Resolve returns the latest version of a dependency within the collection of Dependencies. The candidate set is first filtered by the constraints, then the remaining candidates are sorted for the latest result by semver semantics. Version can contain wildcards and defaults to "*" if not specified.

type HelperLayerContributor 

type HelperLayerContributor struct {

	// Path is the path to the helper application.
	Path string

	// BuildpackInfo describes the buildpack that provides the helper
	BuildpackInfo libcnb.BuildpackInfo

	// Logger is the logger to use.
	Logger log.Logger

	// Names are the names of the helpers to create
	Names []string
}

HelperLayerContributor is a helper for implementing a Contributable for a buildpack helper application in order to get consistent logging and avoidance.

func NewHelperLayerContributor 

func NewHelperLayerContributor(buildpack libcnb.Buildpack, logger log.Logger, names ...string) HelperLayerContributor

NewHelperLayerContributor returns a new HelperLayerContributor

func (HelperLayerContributor) AsSyftArtifact 

func (h HelperLayerContributor) AsSyftArtifact() (sbom.SyftArtifact, error)

func (HelperLayerContributor) Contribute 

func (h HelperLayerContributor) Contribute(layer *libcnb.Layer) error

Contribute is the function to call whe implementing your Contributable.

func (HelperLayerContributor) Name 

func (h HelperLayerContributor) Name() string

Name returns the conventional name of the layer for this contributor

type HttpClientTimeouts 

type HttpClientTimeouts struct {
	DialerTimeout         time.Duration
	DialerKeepAlive       time.Duration
	TLSHandshakeTimeout   time.Duration
	ResponseHeaderTimeout time.Duration
	ExpectContinueTimeout time.Duration
}

type LayerContributor 

type LayerContributor struct {
	// ExpectedMetadata is the metadata to compare against any existing layer metadata.
	ExpectedMetadata interface{}

	// Logger is the logger to use.
	Logger log.Logger

	// Name is the user readable name of the contribution.
	Name string

	// ExpectedTypes indicates the types that should be set on the layer.
	ExpectedTypes libcnb.LayerTypes
}

LayerContributor is a helper for implementing Contributable in order to get consistent logging and avoidance.

func NewLayerContributor 

func NewLayerContributor(name string, expectedMetadata interface{}, expectedTypes libcnb.LayerTypes, logger log.Logger) LayerContributor

NewLayerContributor creates a new instance.

func (*LayerContributor) Contribute 

func (l *LayerContributor) Contribute(layer *libcnb.Layer, f LayerFunc) error

Contribute is the function to call when implementing Contributable.

type LayerFunc 

type LayerFunc func(*libcnb.Layer) error

LayerFunc is a callback function that is invoked when a layer needs to be contributed.

type MergeFunc 

type MergeFunc func(a, b libcnb.BuildpackPlanEntry) (libcnb.BuildpackPlanEntry, error)

MergeFunc takes two BuildpackPlanEntry's and returns a merged entry.

type NoValidDependenciesError 

type NoValidDependenciesError struct {
	// Message is the error message
	Message string
}

NoValidDependenciesError is returned when the resolver cannot find any valid dependencies given the constraints.

func (NoValidDependenciesError) Error 

func (n NoValidDependenciesError) Error() string

type PlanEntryResolver 

type PlanEntryResolver struct {

	// Plan is the BuildpackPlan to resolve against.
	Plan libcnb.BuildpackPlan
}

PlanEntryResolver provides functionality for resolving a Buildpack Plan Entry given a name.

func (*PlanEntryResolver) Resolve 

func (p *PlanEntryResolver) Resolve(name string) (libcnb.BuildpackPlanEntry, bool, error)

Resolve calls ResolveWithMerge function passing in the ShallowMerge function as the merge strategy.

func (*PlanEntryResolver) ResolveWithMerge 

func (p *PlanEntryResolver) ResolveWithMerge(name string, f MergeFunc) (libcnb.BuildpackPlanEntry, bool, error)

ResolveWithMerge returns a single BuildpackPlanEntry that is a merged version of all entries that have a given name. A merge function is used to describe how two entries are merged together.

type RequestModifierFunc 

type RequestModifierFunc func(request *http.Request) (*http.Request, error)

RequestModifierFunc is a callback that enables modification of a download request before it is sent. It is often used to set Authorization headers.

Source Files

View all Source files

Directories

Path Synopsis
mocks
cmd
create-package
update-build-image-dependency
update-buildmodule-dependency
update-lifecycle-dependency
update-package-dependency
mocks
mocks
mocks

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