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builder.go
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builder.go
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package docker
import (
"fmt"
"io"
"os"
"path"
"path/filepath"
"strings"
"golang.org/x/net/context"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/builder"
"github.com/docker/docker/builder/dockerignore"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/fileutils"
"github.com/docker/docker/pkg/jsonmessage"
"github.com/docker/docker/pkg/progress"
"github.com/docker/docker/pkg/streamformatter"
"github.com/docker/docker/pkg/term"
"github.com/docker/engine-api/types"
"github.com/docker/libcompose/project"
)
// DefaultDockerfileName is the default name of a Dockerfile
const DefaultDockerfileName = "Dockerfile"
// Builder defines methods to provide a docker builder. This makes libcompose
// not tied up to the docker daemon builder.
type Builder interface {
Build(imageName string, p *project.Project, service project.Service) error
}
// DaemonBuilder is the daemon "docker build" Builder implementation.
type DaemonBuilder struct {
context *Context
}
// NewDaemonBuilder creates a DaemonBuilder based on the specified context.
func NewDaemonBuilder(ctx *Context) *DaemonBuilder {
return &DaemonBuilder{
context: ctx,
}
}
// Build implements Builder. It consumes the docker build API endpoint and sends
// a tar of the specified service build context.
func (d *DaemonBuilder) Build(imageName string, p *project.Project, service project.Service) error {
if service.Config().Build == "" {
return fmt.Errorf("Specified service does not have a build section")
}
ctx, err := CreateTar(p, service.Name())
if err != nil {
return err
}
defer ctx.Close()
var progBuff io.Writer = os.Stdout
var buildBuff io.Writer = os.Stdout
// Setup an upload progress bar
progressOutput := streamformatter.NewStreamFormatter().NewProgressOutput(progBuff, true)
var body io.Reader = progress.NewProgressReader(ctx, progressOutput, 0, "", "Sending build context to Docker daemon")
client := d.context.ClientFactory.Create(service)
logrus.Infof("Building %s...", imageName)
outFd, isTerminalOut := term.GetFdInfo(os.Stdout)
response, err := client.ImageBuild(context.Background(), types.ImageBuildOptions{
Context: body,
Tags: []string{imageName},
NoCache: d.context.NoCache,
Remove: true,
Dockerfile: service.Config().Dockerfile,
AuthConfigs: d.context.ConfigFile.AuthConfigs,
})
err = jsonmessage.DisplayJSONMessagesStream(response.Body, buildBuff, outFd, isTerminalOut, nil)
if err != nil {
if jerr, ok := err.(*jsonmessage.JSONError); ok {
// If no error code is set, default to 1
if jerr.Code == 0 {
jerr.Code = 1
}
fmt.Fprintf(os.Stderr, "%s%s", progBuff, buildBuff)
return fmt.Errorf("Status: %s, Code: %d", jerr.Message, jerr.Code)
}
}
return err
}
// CreateTar create a build context tar for the specified project and service name.
func CreateTar(p *project.Project, name string) (io.ReadCloser, error) {
// This code was ripped off from docker/api/client/build.go
serviceConfig, _ := p.Configs.Get(name)
root := serviceConfig.Build
dockerfileName := filepath.Join(root, serviceConfig.Dockerfile)
absRoot, err := filepath.Abs(root)
if err != nil {
return nil, err
}
filename := dockerfileName
if dockerfileName == "" {
// No -f/--file was specified so use the default
dockerfileName = DefaultDockerfileName
filename = filepath.Join(absRoot, dockerfileName)
// Just to be nice ;-) look for 'dockerfile' too but only
// use it if we found it, otherwise ignore this check
if _, err = os.Lstat(filename); os.IsNotExist(err) {
tmpFN := path.Join(absRoot, strings.ToLower(dockerfileName))
if _, err = os.Lstat(tmpFN); err == nil {
dockerfileName = strings.ToLower(dockerfileName)
filename = tmpFN
}
}
}
origDockerfile := dockerfileName // used for error msg
if filename, err = filepath.Abs(filename); err != nil {
return nil, err
}
// Now reset the dockerfileName to be relative to the build context
dockerfileName, err = filepath.Rel(absRoot, filename)
if err != nil {
return nil, err
}
// And canonicalize dockerfile name to a platform-independent one
dockerfileName, err = archive.CanonicalTarNameForPath(dockerfileName)
if err != nil {
return nil, fmt.Errorf("Cannot canonicalize dockerfile path %s: %v", dockerfileName, err)
}
if _, err = os.Lstat(filename); os.IsNotExist(err) {
return nil, fmt.Errorf("Cannot locate Dockerfile: %s", origDockerfile)
}
var includes = []string{"."}
var excludes []string
dockerIgnorePath := path.Join(root, ".dockerignore")
dockerIgnore, err := os.Open(dockerIgnorePath)
if err != nil {
if !os.IsNotExist(err) {
return nil, err
}
logrus.Warnf("Error while reading .dockerignore (%s) : %s", dockerIgnorePath, err.Error())
excludes = make([]string, 0)
} else {
excludes, err = dockerignore.ReadAll(dockerIgnore)
if err != nil {
return nil, err
}
}
// If .dockerignore mentions .dockerignore or the Dockerfile
// then make sure we send both files over to the daemon
// because Dockerfile is, obviously, needed no matter what, and
// .dockerignore is needed to know if either one needs to be
// removed. The deamon will remove them for us, if needed, after it
// parses the Dockerfile.
keepThem1, _ := fileutils.Matches(".dockerignore", excludes)
keepThem2, _ := fileutils.Matches(dockerfileName, excludes)
if keepThem1 || keepThem2 {
includes = append(includes, ".dockerignore", dockerfileName)
}
if err := builder.ValidateContextDirectory(root, excludes); err != nil {
return nil, fmt.Errorf("Error checking context is accessible: '%s'. Please check permissions and try again.", err)
}
options := &archive.TarOptions{
Compression: archive.Uncompressed,
ExcludePatterns: excludes,
IncludeFiles: includes,
}
return archive.TarWithOptions(root, options)
}