forked from box-builder/box
/
docker_image.go
228 lines (188 loc) · 5.34 KB
/
docker_image.go
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package layers
import (
"context"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"path"
"path/filepath"
"strings"
"github.com/box-builder/box/copy"
"github.com/box-builder/box/image"
om "github.com/box-builder/overmount"
"github.com/box-builder/overmount/imgio"
"github.com/docker/docker/api/types"
"github.com/docker/docker/client"
)
// DockerImage is the Image interface applied to docker.
type DockerImage struct {
imageConfig *ImageConfig
client *client.Client
}
// NewDockerImage contypes a new DockerImage
func NewDockerImage(imageConfig *ImageConfig) (*DockerImage, error) {
client, err := client.NewEnvClient()
if err != nil {
return nil, err
}
return &DockerImage{
imageConfig: imageConfig,
client: client,
}, nil
}
func (d *DockerImage) ociSave(filename, tag string) error {
repo, err := om.NewRepository(path.Join(os.Getenv("HOME"), ".overmount"), true)
if err != nil {
return err
}
img, err := imgio.NewDocker(d.client)
if err != nil {
return err
}
reader, err := d.client.ImageSave(d.imageConfig.Globals.Context, []string{d.imageConfig.Config.Image})
if err != nil {
return err
}
layers, err := repo.Import(img, reader)
if err != nil {
return err
}
if len(layers) != 1 {
return errors.New("image query expected one, returned more than one image")
}
imageContent, err := repo.Export(imgio.NewOCI(), layers[0], []string{tag})
if err != nil {
return err
}
w, err := os.Create(filename)
if err != nil {
return err
}
defer w.Close()
return copy.WithProgress(w, imageContent, d.imageConfig.Globals.Logger, fmt.Sprintf("Saving %q", filename))
}
func (d *DockerImage) dockerSave(f io.WriteCloser, filename, tag string) error {
r, err := d.client.ImageSave(d.imageConfig.Globals.Context, []string{d.imageConfig.Config.Image, tag})
if err != nil {
return err
}
return copy.WithProgress(f, r, d.imageConfig.Globals.Logger, fmt.Sprintf("Saving %q to disk", filename))
}
// Save saves an image to the provided filename.
func (d *DockerImage) Save(filename, kind, tag string) error {
wd, err := os.Getwd()
if err != nil {
return err
}
abs, err := filepath.Abs(filename)
if err != nil {
return err
}
rel, err := filepath.Rel(wd, abs)
if err != nil {
return err
}
if strings.HasPrefix(rel, "../") {
return fmt.Errorf("relative path %q for save falls below the working directory, cannot save", rel)
}
switch kind {
case "", "docker":
f, err := os.Create(rel)
if err != nil {
return err
}
defer f.Close()
return d.dockerSave(f, filename, tag)
case "oci":
return d.ociSave(filename, tag)
default:
return fmt.Errorf("image kind %q is not valid", kind)
}
}
// Flatten copies a tarred up series of files (passed in through the
// io.Reader handle) to the image where they are untarred.
func (d *DockerImage) Flatten(tw io.Reader) error {
imgName, err := image.NewImage(d.imageConfig.Globals, nil, d.imageConfig.Config, nil).Flatten(tw)
if err != nil {
return err
}
out, err := os.Open(imgName)
if err != nil {
return err
}
defer out.Close()
defer os.Remove(out.Name())
r, w := io.Pipe()
go func() {
err := copy.WithProgress(w, out, d.imageConfig.Globals.Logger, "Loading image into docker")
if err != nil {
w.CloseWithError(err)
} else {
w.Close()
}
}()
resp, err := d.client.ImageLoad(d.imageConfig.Globals.Context, r, true)
if err != nil {
return err
}
defer resp.Body.Close()
content, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
res := map[string]string{}
if err := json.Unmarshal(content, &res); err != nil {
parts := strings.SplitN(string(content), ":", 2)
if len(parts) != 2 {
return fmt.Errorf("Invalid value returned from docker: %s", string(content))
}
d.imageConfig.Config.Image = strings.TrimSpace(parts[1])
return nil
}
if stream, ok := res["stream"]; ok {
// FIXME this is absolutely terrible
if strings.HasPrefix(stream, "Loaded image ID: ") {
d.imageConfig.Config.Image = strings.TrimSpace(strings.TrimPrefix(stream, "Loaded image ID: "))
return nil
}
}
return errors.New("invalid image ID returned")
}
// Tag an image with the provided string.
func (d *DockerImage) Tag(tag string) error {
return d.client.ImageTag(d.imageConfig.Globals.Context, d.imageConfig.Config.Image, tag)
}
// CheckCache consults the cache and returns true or false depending on whether
// there was a match. If there was an error consulting the cache, it will be
// returned as the second argument.
func (d *DockerImage) CheckCache(cacheKey string) (bool, error) {
if !d.imageConfig.Globals.Cache {
return false, nil
}
images, err := d.client.ImageList(context.Background(), types.ImageListOptions{All: true})
if err != nil {
return false, err
}
for _, img := range images {
if (img.ParentID != "" && img.ParentID == d.imageConfig.Config.Image) || img.ParentID == "" {
inspect, _, err := d.client.ImageInspectWithRaw(context.Background(), img.ID)
if err != nil {
return false, err
}
if inspect.Comment == cacheKey {
d.imageConfig.Globals.Logger.CacheHit(img.ID)
d.imageConfig.Config.FromDocker(true, inspect.Config)
d.imageConfig.Config.Image = img.ID
return true, d.imageConfig.Layers.AddImage(img.ID)
}
}
}
return false, nil
}
// ImageID returns the image identifier of the most recent layer.
func (d *DockerImage) ImageID() string {
return d.imageConfig.Config.Image
}