github.com/jiasir/docker@v1.3.3-0.20170609024000-252e610103e7/api/server/backend/build/backend.go (about)

     1  package build
     2  
     3  import (
     4  	"fmt"
     5  
     6  	"github.com/docker/distribution/reference"
     7  	"github.com/docker/docker/api/types/backend"
     8  	"github.com/docker/docker/builder"
     9  	"github.com/docker/docker/builder/dockerfile"
    10  	"github.com/docker/docker/image"
    11  	"github.com/docker/docker/pkg/stringid"
    12  	"github.com/pkg/errors"
    13  	"golang.org/x/net/context"
    14  )
    15  
    16  // ImageComponent provides an interface for working with images
    17  type ImageComponent interface {
    18  	SquashImage(from string, to string) (string, error)
    19  	TagImageWithReference(image.ID, reference.Named) error
    20  }
    21  
    22  // Backend provides build functionality to the API router
    23  type Backend struct {
    24  	manager        *dockerfile.BuildManager
    25  	imageComponent ImageComponent
    26  }
    27  
    28  // NewBackend creates a new build backend from components
    29  func NewBackend(components ImageComponent, builderBackend builder.Backend) *Backend {
    30  	manager := dockerfile.NewBuildManager(builderBackend)
    31  	return &Backend{imageComponent: components, manager: manager}
    32  }
    33  
    34  // Build builds an image from a Source
    35  func (b *Backend) Build(ctx context.Context, config backend.BuildConfig) (string, error) {
    36  	options := config.Options
    37  	tagger, err := NewTagger(b.imageComponent, config.ProgressWriter.StdoutFormatter, options.Tags)
    38  	if err != nil {
    39  		return "", err
    40  	}
    41  
    42  	build, err := b.manager.Build(ctx, config)
    43  	if err != nil {
    44  		return "", err
    45  	}
    46  
    47  	var imageID = build.ImageID
    48  	if options.Squash {
    49  		if imageID, err = squashBuild(build, b.imageComponent); err != nil {
    50  			return "", err
    51  		}
    52  	}
    53  
    54  	stdout := config.ProgressWriter.StdoutFormatter
    55  	fmt.Fprintf(stdout, "Successfully built %s\n", stringid.TruncateID(imageID))
    56  	err = tagger.TagImages(image.ID(imageID))
    57  	return imageID, err
    58  }
    59  
    60  func squashBuild(build *builder.Result, imageComponent ImageComponent) (string, error) {
    61  	var fromID string
    62  	if build.FromImage != nil {
    63  		fromID = build.FromImage.ImageID()
    64  	}
    65  	imageID, err := imageComponent.SquashImage(build.ImageID, fromID)
    66  	if err != nil {
    67  		return "", errors.Wrap(err, "error squashing image")
    68  	}
    69  	return imageID, nil
    70  }