packer

package
v1.0.0 Latest Latest
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 Go to latest Published: Apr 4, 2017 License: MPL-2.0 Imports: 26 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// This is the key in configurations that is set to the name of the
	// build.
	BuildNameConfigKey = "packer_build_name"

	// This is the key in the configuration that is set to the type
	// of the builder that is run. This is useful for provisioners and
	// such who want to make use of this.
	BuilderTypeConfigKey = "packer_builder_type"

	// This is the key in configurations that is set to "true" when Packer
	// debugging is enabled.
	DebugConfigKey = "packer_debug"

	// This is the key in configurations that is set to "true" when Packer
	// force build is enabled.
	ForceConfigKey = "packer_force"

	// This key determines what to do when a normal multistep step fails
	// - "cleanup" - run cleanup steps
	// - "abort" - exit without cleanup
	// - "ask" - ask the user
	OnErrorConfigKey = "packer_on_error"

	// TemplatePathKey is the path to the template that configured this build
	TemplatePathKey = "packer_template_path"

	// This key contains a map[string]string of the user variables for
	// template processing.
	UserVariablesConfigKey = "packer_user_variables"
)
View Source 
const (
	UiColorRed     UiColor = 31
	UiColorGreen           = 32
	UiColorYellow          = 33
	UiColorBlue            = 34
	UiColorMagenta         = 35
	UiColorCyan            = 36
)
View Source 
const CmdDisconnect int = 2300218

CmdDisconnect is a sentinel value to indicate a RemoteCmd exited because the remote side disconnected us.

View Source 
const HookProvision = "packer_provision"

This is the hook that should be fired for provisioners to run.

Variables

This section is empty.

Functions

func ConfigDir 

func ConfigDir() (string, error)

ConfigDir returns the configuration directory for Packer.

func ConfigFile 

func ConfigFile() (string, error)

ConfigFile returns the default path to the configuration file. On Unix-like systems this is the ".packerconfig" file in the home directory. On Windows, this is the "packer.config" file in the application data directory.

func ConfigTmpDir 

func ConfigTmpDir() (string, error)

ConfigTmpDir returns the configuration tmp directory for Packer

Types

type Artifact 

type Artifact interface {
	// Returns the ID of the builder that was used to create this artifact.
	// This is the internal ID of the builder and should be unique to every
	// builder. This can be used to identify what the contents of the
	// artifact actually are.
	BuilderId() string

	// Returns the set of files that comprise this artifact. If an
	// artifact is not made up of files, then this will be empty.
	Files() []string

	// The ID for the artifact, if it has one. This is not guaranteed to
	// be unique every run (like a GUID), but simply provide an identifier
	// for the artifact that may be meaningful in some way. For example,
	// for Amazon EC2, this value might be the AMI ID.
	Id() string

	// Returns human-readable output that describes the artifact created.
	// This is used for UI output. It can be multiple lines.
	String() string

	// State allows the caller to ask for builder specific state information
	// relating to the artifact instance.
	State(name string) interface{}

	// Destroy deletes the artifact. Packer calls this for various reasons,
	// such as if a post-processor has processed this artifact and it is
	// no longer needed.
	Destroy() error
}

An Artifact is the result of a build, and is the metadata that documents what a builder actually created. The exact meaning of the contents is specific to each builder, but this interface is used to communicate back to the user the result of a build.

type BasicUi 

type BasicUi struct {
	Reader      io.Reader
	Writer      io.Writer
	ErrorWriter io.Writer
	// contains filtered or unexported fields
}

The BasicUI is a UI that reads and writes from a standard Go reader and writer. It is safe to be called from multiple goroutines. Machine readable output is simply logged for this UI.

func (*BasicUi) Ask 

func (rw *BasicUi) Ask(query string) (string, error)

func (*BasicUi) Error 

func (rw *BasicUi) Error(message string)

func (*BasicUi) Machine 

func (rw *BasicUi) Machine(t string, args ...string)

func (*BasicUi) Message 

func (rw *BasicUi) Message(message string)

func (*BasicUi) Say 

func (rw *BasicUi) Say(message string)

type Build 

type Build interface {
	// Name is the name of the build. This is unique across a single template,
	// but not absolutely unique. This is meant more to describe to the user
	// what is being built rather than being a unique identifier.
	Name() string

	// Prepare configures the various components of this build and reports
	// any errors in doing so (such as syntax errors, validation errors, etc.).
	// It also reports any warnings.
	Prepare() ([]string, error)

	// Run runs the actual builder, returning an artifact implementation
	// of what is built. If anything goes wrong, an error is returned.
	Run(Ui, Cache) ([]Artifact, error)

	// Cancel will cancel a running build. This will block until the build
	// is actually completely canceled.
	Cancel()

	// SetDebug will enable/disable debug mode. Debug mode is always
	// enabled by adding the additional key "packer_debug" to boolean
	// true in the configuration of the various components. This must
	// be called prior to Prepare.
	//
	// When SetDebug is set to true, parallelism between builds is
	// strictly prohibited.
	SetDebug(bool)

	// SetForce will enable/disable forcing a build when artifacts exist.
	//
	// When SetForce is set to true, existing artifacts from the build are
	// deleted prior to the build.
	SetForce(bool)

	// SetOnError will determine what to do when a normal multistep step fails
	// - "cleanup" - run cleanup steps
	// - "abort" - exit without cleanup
	// - "ask" - ask the user
	SetOnError(string)
}

A Build represents a single job within Packer that is responsible for building some machine image artifact. Builds are meant to be parallelized.

type Builder 

type Builder interface {
	// Prepare is responsible for configuring the builder and validating
	// that configuration. Any setup should be done in this method. Note that
	// NO side effects should take place in prepare, it is meant as a state
	// setup only. Calling Prepare is not necessarily followed by a Run.
	//
	// The parameters to Prepare are a set of interface{} values of the
	// configuration. These are almost always `map[string]interface{}`
	// parsed from a template, but no guarantee is made.
	//
	// Each of the configuration values should merge into the final
	// configuration.
	//
	// Prepare should return a list of warnings along with any errors
	// that occurred while preparing.
	Prepare(...interface{}) ([]string, error)

	// Run is where the actual build should take place. It takes a Build and a Ui.
	Run(ui Ui, hook Hook, cache Cache) (Artifact, error)

	// Cancel cancels a possibly running Builder. This should block until
	// the builder actually cancels and cleans up after itself.
	Cancel()
}

Implementers of Builder are responsible for actually building images on some platform given some configuration.

In addition to the documentation on Prepare above: Prepare is sometimes configured with a `map[string]interface{}` that has a key "packer_debug". This is a boolean value. If it is set to true, then the builder should enable a debug mode which allows builder developers and advanced users to introspect what is going on during a build. During debug builds, parallelism is strictly disabled, so it is safe to request input from stdin and so on.

type BuilderFunc 

type BuilderFunc func(name string) (Builder, error)

The function type used to lookup Builder implementations.

type Cache 

type Cache interface {
	// Lock takes a key and returns the path where the file can be written to.
	// Packer guarantees that no other process will write to this file while
	// the lock is held.
	//
	// If the key has an extension (e.g., file.ext), the resulting path
	// will have that extension as well.
	//
	// The cache will block and wait for the lock.
	Lock(string) string

	// Unlock will unlock a certain cache key. Be very careful that this
	// is only called once per lock obtained.
	Unlock(string)

	// RLock returns the path to a key in the cache and locks it for reading.
	// The second return parameter is whether the key existed or not.
	// This will block if any locks are held for writing. No lock will be
	// held if the key doesn't exist.
	RLock(string) (string, bool)

	// RUnlock will unlock a key for reading.
	RUnlock(string)
}

Cache implements a caching interface where files can be stored for re-use between multiple runs.

type ColoredUi 

type ColoredUi struct {
	Color      UiColor
	ErrorColor UiColor
	Ui         Ui
}

ColoredUi is a UI that is colored using terminal colors.

func (*ColoredUi) Ask 

func (u *ColoredUi) Ask(query string) (string, error)

func (*ColoredUi) Error 

func (u *ColoredUi) Error(message string)

func (*ColoredUi) Machine 

func (u *ColoredUi) Machine(t string, args ...string)

func (*ColoredUi) Message 

func (u *ColoredUi) Message(message string)

func (*ColoredUi) Say 

func (u *ColoredUi) Say(message string)

type Communicator 

type Communicator interface {
	// Start takes a RemoteCmd and starts it. The RemoteCmd must not be
	// modified after being used with Start, and it must not be used with
	// Start again. The Start method returns immediately once the command
	// is started. It does not wait for the command to complete. The
	// RemoteCmd.Exited field should be used for this.
	Start(*RemoteCmd) error

	// Upload uploads a file to the machine to the given path with the
	// contents coming from the given reader. This method will block until
	// it completes.
	Upload(string, io.Reader, *os.FileInfo) error

	// UploadDir uploads the contents of a directory recursively to
	// the remote path. It also takes an optional slice of paths to
	// ignore when uploading.
	//
	// The folder name of the source folder should be created unless there
	// is a trailing slash on the source "/". For example: "/tmp/src" as
	// the source will create a "src" directory in the destination unless
	// a trailing slash is added. This is identical behavior to rsync(1).
	UploadDir(dst string, src string, exclude []string) error

	// Download downloads a file from the machine from the given remote path
	// with the contents writing to the given writer. This method will
	// block until it completes.
	Download(string, io.Writer) error

	DownloadDir(src string, dst string, exclude []string) error
}

A Communicator is the interface used to communicate with the machine that exists that will eventually be packaged into an image. Communicators allow you to execute remote commands, upload files, etc.

Communicators must be safe for concurrency, meaning multiple calls to Start or any other method may be called at the same time.

type ComponentFinder 

type ComponentFinder struct {
	Builder       BuilderFunc
	Hook          HookFunc
	PostProcessor PostProcessorFunc
	Provisioner   ProvisionerFunc
}

ComponentFinder is a struct that contains the various function pointers necessary to look up components of Packer such as builders, commands, etc.

type Core 

type Core struct {
	Template *template.Template
	// contains filtered or unexported fields
}

Core is the main executor of Packer. If Packer is being used as a library, this is the struct you'll want to instantiate to get anything done.

func NewCore 

func NewCore(c *CoreConfig) (*Core, error)

NewCore creates a new Core.

func TestCore 

func TestCore(t *testing.T, c *CoreConfig) *Core

func (*Core) Build 

func (c *Core) Build(n string) (Build, error)

Build returns the Build object for the given name.

func (*Core) BuildNames 

func (c *Core) BuildNames() []string

BuildNames returns the builds that are available in this configured core.

func (*Core) Context 

func (c *Core) Context() *interpolate.Context

Context returns an interpolation context.

type CoreConfig 

type CoreConfig struct {
	Components ComponentFinder
	Template   *template.Template
	Variables  map[string]string
	Version    string
}

CoreConfig is the structure for initializing a new Core. Once a CoreConfig is used to initialize a Core, it shouldn't be re-used or modified again.

func TestCoreConfig 

func TestCoreConfig(t *testing.T) *CoreConfig

type DispatchHook 

type DispatchHook struct {
	Mapping map[string][]Hook
	// contains filtered or unexported fields
}

A Hook implementation that dispatches based on an internal mapping.

func (*DispatchHook) Cancel 

func (h *DispatchHook) Cancel()

Cancels all the hooks that are currently in-flight, if any. This will block until the hooks are all cancelled.

func (*DispatchHook) Run 

func (h *DispatchHook) Run(name string, ui Ui, comm Communicator, data interface{}) error

Runs the hook with the given name by dispatching it to the proper hooks if a mapping exists. If a mapping doesn't exist, then nothing happens.

type FileCache 

type FileCache struct {
	CacheDir string
	// contains filtered or unexported fields
}

FileCache implements a Cache by caching the data directly to a cache directory.

func (*FileCache) Lock 

func (f *FileCache) Lock(key string) string

func (*FileCache) RLock 

func (f *FileCache) RLock(key string) (string, bool)

func (*FileCache) RUnlock 

func (f *FileCache) RUnlock(key string)

func (*FileCache) Unlock 

func (f *FileCache) Unlock(key string)

type Hook 

type Hook interface {
	Run(string, Ui, Communicator, interface{}) error
	Cancel()
}

A Hook is used to hook into an arbitrarily named location in a build, allowing custom behavior to run at certain points along a build.

Run is called when the hook is called, with the name of the hook and arbitrary data associated with it. To know what format the data is in, you must reference the documentation for the specific hook you're interested in. In addition to that, the Hook is given access to a UI so that it can output things to the user.

Cancel is called when the hook needs to be cancelled. This will usually be called when Run is still in progress so the mechanism that handles this must be race-free. Cancel should attempt to cancel the hook in the quickest, safest way possible.

type HookFunc 

type HookFunc func(name string) (Hook, error)

The function type used to lookup Hook implementations.

type MachineReadableUi 

type MachineReadableUi struct {
	Writer io.Writer
}

MachineReadableUi is a UI that only outputs machine-readable output to the given Writer.

func (*MachineReadableUi) Ask 

func (u *MachineReadableUi) Ask(query string) (string, error)

func (*MachineReadableUi) Error 

func (u *MachineReadableUi) Error(message string)

func (*MachineReadableUi) Machine 

func (u *MachineReadableUi) Machine(category string, args ...string)

func (*MachineReadableUi) Message 

func (u *MachineReadableUi) Message(message string)

func (*MachineReadableUi) Say 

func (u *MachineReadableUi) Say(message string)

type MockArtifact 

type MockArtifact struct {
	BuilderIdValue string
	FilesValue     []string
	IdValue        string
	StateValues    map[string]interface{}
	DestroyCalled  bool
}

MockArtifact is an implementation of Artifact that can be used for tests.

func (*MockArtifact) BuilderId 

func (a *MockArtifact) BuilderId() string

func (*MockArtifact) Destroy 

func (a *MockArtifact) Destroy() error

func (*MockArtifact) Files 

func (a *MockArtifact) Files() []string

func (*MockArtifact) Id 

func (a *MockArtifact) Id() string

func (*MockArtifact) State 

func (a *MockArtifact) State(name string) interface{}

func (*MockArtifact) String 

func (*MockArtifact) String() string

type MockBuilder 

type MockBuilder struct {
	ArtifactId      string
	PrepareWarnings []string
	RunErrResult    bool
	RunNilResult    bool

	PrepareCalled bool
	PrepareConfig []interface{}
	RunCalled     bool
	RunCache      Cache
	RunHook       Hook
	RunUi         Ui
	CancelCalled  bool
}

MockBuilder is an implementation of Builder that can be used for tests. You can set some fake return values and you can keep track of what methods were called on the builder. It is fairly basic.

func TestBuilder 

func TestBuilder(t *testing.T, c *CoreConfig, n string) *MockBuilder

TestBuilder sets the builder with the name n to the component finder and returns the mock.

func (*MockBuilder) Cancel 

func (tb *MockBuilder) Cancel()

func (*MockBuilder) Prepare 

func (tb *MockBuilder) Prepare(config ...interface{}) ([]string, error)

func (*MockBuilder) Run 

func (tb *MockBuilder) Run(ui Ui, h Hook, c Cache) (Artifact, error)

type MockCommunicator 

type MockCommunicator struct {
	StartCalled     bool
	StartCmd        *RemoteCmd
	StartStderr     string
	StartStdout     string
	StartStdin      string
	StartExitStatus int

	UploadCalled bool
	UploadPath   string
	UploadData   string

	UploadDirDst     string
	UploadDirSrc     string
	UploadDirExclude []string

	DownloadDirDst     string
	DownloadDirSrc     string
	DownloadDirExclude []string

	DownloadCalled bool
	DownloadPath   string
	DownloadData   string
}

MockCommunicator is a valid Communicator implementation that can be used for tests.

func (*MockCommunicator) Download 

func (c *MockCommunicator) Download(path string, w io.Writer) error

func (*MockCommunicator) DownloadDir 

func (c *MockCommunicator) DownloadDir(src string, dst string, excl []string) error

func (*MockCommunicator) Start 

func (c *MockCommunicator) Start(rc *RemoteCmd) error

func (*MockCommunicator) Upload 

func (c *MockCommunicator) Upload(path string, r io.Reader, fi *os.FileInfo) error

func (*MockCommunicator) UploadDir 

func (c *MockCommunicator) UploadDir(dst string, src string, excl []string) error

type MockHook 

type MockHook struct {
	RunFunc func() error

	RunCalled    bool
	RunComm      Communicator
	RunData      interface{}
	RunName      string
	RunUi        Ui
	CancelCalled bool
}

MockHook is an implementation of Hook that can be used for tests.

func (*MockHook) Cancel 

func (t *MockHook) Cancel()

func (*MockHook) Run 

func (t *MockHook) Run(name string, ui Ui, comm Communicator, data interface{}) error

type MockPostProcessor 

type MockPostProcessor struct {
	ArtifactId string
	Keep       bool
	Error      error

	ConfigureCalled  bool
	ConfigureConfigs []interface{}
	ConfigureError   error

	PostProcessCalled   bool
	PostProcessArtifact Artifact
	PostProcessUi       Ui
}

MockPostProcessor is an implementation of PostProcessor that can be used for tests.

func TestPostProcessor 

func TestPostProcessor(t *testing.T, c *CoreConfig, n string) *MockPostProcessor

TestPostProcessor sets the prov. with the name n to the component finder and returns the mock.

func (*MockPostProcessor) Configure 

func (t *MockPostProcessor) Configure(configs ...interface{}) error

func (*MockPostProcessor) PostProcess 

func (t *MockPostProcessor) PostProcess(ui Ui, a Artifact) (Artifact, bool, error)

type MockProvisioner 

type MockProvisioner struct {
	ProvFunc func() error

	PrepCalled       bool
	PrepConfigs      []interface{}
	ProvCalled       bool
	ProvCommunicator Communicator
	ProvUi           Ui
	CancelCalled     bool
}

MockProvisioner is an implementation of Provisioner that can be used for tests.

func TestProvisioner 

func TestProvisioner(t *testing.T, c *CoreConfig, n string) *MockProvisioner

TestProvisioner sets the prov. with the name n to the component finder and returns the mock.

func (*MockProvisioner) Cancel 

func (t *MockProvisioner) Cancel()

func (*MockProvisioner) Prepare 

func (t *MockProvisioner) Prepare(configs ...interface{}) error

func (*MockProvisioner) Provision 

func (t *MockProvisioner) Provision(ui Ui, comm Communicator) error

type MultiError 

type MultiError struct {
	Errors []error
}

MultiError is an error type to track multiple errors. This is used to accumulate errors in cases such as configuration parsing, and returning them as a single error.

func MultiErrorAppend 

func MultiErrorAppend(err error, errs ...error) *MultiError

MultiErrorAppend is a helper function that will append more errors onto a MultiError in order to create a larger multi-error. If the original error is not a MultiError, it will be turned into one.

func (*MultiError) Error 

func (e *MultiError) Error() string

type PausedProvisioner 

type PausedProvisioner struct {
	PauseBefore time.Duration
	Provisioner Provisioner
	// contains filtered or unexported fields
}

PausedProvisioner is a Provisioner implementation that pauses before the provisioner is actually run.

func (*PausedProvisioner) Cancel 

func (p *PausedProvisioner) Cancel()

func (*PausedProvisioner) Prepare 

func (p *PausedProvisioner) Prepare(raws ...interface{}) error

func (*PausedProvisioner) Provision 

func (p *PausedProvisioner) Provision(ui Ui, comm Communicator) error

type PostProcessor 

type PostProcessor interface {
	// Configure is responsible for setting up configuration, storing
	// the state for later, and returning and errors, such as validation
	// errors.
	Configure(...interface{}) error

	// PostProcess takes a previously created Artifact and produces another
	// Artifact. If an error occurs, it should return that error. If `keep`
	// is to true, then the previous artifact is forcibly kept.
	PostProcess(Ui, Artifact) (a Artifact, keep bool, err error)
}

A PostProcessor is responsible for taking an artifact of a build and doing some sort of post-processing to turn this into another artifact. An example of a post-processor would be something that takes the result of a build, compresses it, and returns a new artifact containing a single file of the prior artifact compressed.

type PostProcessorFunc 

type PostProcessorFunc func(name string) (PostProcessor, error)

The function type used to lookup PostProcessor implementations.

type ProvisionHook 

type ProvisionHook struct {
	// The provisioners to run as part of the hook. These should already
	// be prepared (by calling Prepare) at some earlier stage.
	Provisioners []Provisioner
	// contains filtered or unexported fields
}

A Hook implementation that runs the given provisioners.

func (*ProvisionHook) Cancel 

func (h *ProvisionHook) Cancel()

Cancels the privisioners that are still running.

func (*ProvisionHook) Run 

func (h *ProvisionHook) Run(name string, ui Ui, comm Communicator, data interface{}) error

Runs the provisioners in order.

type Provisioner 

type Provisioner interface {
	// Prepare is called with a set of configurations to setup the
	// internal state of the provisioner. The multiple configurations
	// should be merged in some sane way.
	Prepare(...interface{}) error

	// Provision is called to actually provision the machine. A UI is
	// given to communicate with the user, and a communicator is given that
	// is guaranteed to be connected to some machine so that provisioning
	// can be done.
	Provision(Ui, Communicator) error

	// Cancel is called to cancel the provisioning. This is usually called
	// while Provision is still being called. The Provisioner should act
	// to stop its execution as quickly as possible in a race-free way.
	Cancel()
}

A provisioner is responsible for installing and configuring software on a machine prior to building the actual image.

type ProvisionerFunc 

type ProvisionerFunc func(name string) (Provisioner, error)

The function type used to lookup Provisioner implementations.

type RemoteCmd 

type RemoteCmd struct {
	// Command is the command to run remotely. This is executed as if
	// it were a shell command, so you are expected to do any shell escaping
	// necessary.
	Command string

	// Stdin specifies the process's standard input. If Stdin is
	// nil, the process reads from an empty bytes.Buffer.
	Stdin io.Reader

	// Stdout and Stderr represent the process's standard output and
	// error.
	//
	// If either is nil, it will be set to ioutil.Discard.
	Stdout io.Writer
	Stderr io.Writer

	// This will be set to true when the remote command has exited. It
	// shouldn't be set manually by the user, but there is no harm in
	// doing so.
	Exited bool

	// Once Exited is true, this will contain the exit code of the process.
	ExitStatus int

	// This thing is a mutex, lock when making modifications concurrently
	sync.Mutex
	// contains filtered or unexported fields
}

RemoteCmd represents a remote command being prepared or run.

func (*RemoteCmd) SetExited 

func (r *RemoteCmd) SetExited(status int)

SetExited is a helper for setting that this process is exited. This should be called by communicators who are running a remote command in order to set that the command is done.

func (*RemoteCmd) StartWithUi 

func (r *RemoteCmd) StartWithUi(c Communicator, ui Ui) error

StartWithUi runs the remote command and streams the output to any configured Writers for stdout/stderr, while also writing each line as it comes to a Ui.

func (*RemoteCmd) Wait 

func (r *RemoteCmd) Wait()

Wait waits for the remote command to complete.

type TargetedUI 

type TargetedUI struct {
	Target string
	Ui     Ui
}

TargetedUI is a UI that wraps another UI implementation and modifies the output to indicate a specific target. Specifically, all Say output is prefixed with the target name. Message output is not prefixed but is offset by the length of the target so that output is lined up properly with Say output. Machine-readable output has the proper target set.

func (*TargetedUI) Ask 

func (u *TargetedUI) Ask(query string) (string, error)

func (*TargetedUI) Error 

func (u *TargetedUI) Error(message string)

func (*TargetedUI) Machine 

func (u *TargetedUI) Machine(t string, args ...string)

func (*TargetedUI) Message 

func (u *TargetedUI) Message(message string)

func (*TargetedUI) Say 

func (u *TargetedUI) Say(message string)

type Ui 

type Ui interface {
	Ask(string) (string, error)
	Say(string)
	Message(string)
	Error(string)
	Machine(string, ...string)
}

The Ui interface handles all communication for Packer with the outside world. This sort of control allows us to strictly control how output is formatted and various levels of output.

func TestUi 

func TestUi(t *testing.T) Ui

type UiColor 

type UiColor uint

Source Files

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Directories

Path Synopsis
The plugin package provides the functionality to both expose a Packer plugin binary and to connect to an existing Packer plugin binary.
 The plugin package provides the functionality to both expose a Packer plugin binary and to connect to an existing Packer plugin binary.

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