layer

Documentation

Index

• Constants
• Variables
• func Squash(client DockerClient, imageName, downToLayer, newName, tempDir string) (resultImageID string, err error)
• type DockerClient

Constants

const (
	// Maximum layer count is set and enforced by docker:
	//  https://github.com/docker/docker/blob/101c749b6533ab309eccea6b6c6173a0c25f787d/image/image.go#L308
	MAX_LAYER_COUNT  int = 127 - 2
	WARN_LAYER_COUNT int = MAX_LAYER_COUNT - 16
)

Variables

var FilesToIgnore = map[string]struct{}{
	".dockerenv":      struct{}{},
	".dockerinit":     struct{}{},
	"./":              struct{}{},
	"dev/":            struct{}{},
	"dev/console":     struct{}{},
	"dev/shm/":        struct{}{},
	"etc/":            struct{}{},
	"etc/hostname":    struct{}{},
	"etc/hosts":       struct{}{},
	"etc/mtab":        struct{}{},
	"etc/resolv.conf": struct{}{},
}

FilesToIgnore are the files that Squash will ignore when computing diffs.

Functions

func Squash

func Squash(client DockerClient, imageName, downToLayer, newName, tempDir string) (resultImageID string, err error)

Squash flattens the image down to the downToLayer and optionally retag the generated layer with newName. The resulting layer is returned in resultImageID.

Types

type DockerClient

type DockerClient interface {
	CreateContainer(docker.CreateContainerOptions) (*docker.Container, error)
	RemoveContainer(docker.RemoveContainerOptions) error
	ExportContainer(docker.ExportContainerOptions) error
	InspectImage(name string) (*docker.Image, error)
	ImportImage(docker.ImportImageOptions) error
}

DockerClient is the minimal docker client interface this package needs.