func (b *buildFile) Build(context io.Reader) (string, error) {
tmpdirPath, err := ioutil.TempDir("", "docker-build")
if err != nil {
return "", err
}
decompressedStream, err := archive.DecompressStream(context)
if err != nil {
return "", err
}
b.context = &tarsum.TarSum{Reader: decompressedStream, DisableCompression: true}
if err := archive.Untar(b.context, tmpdirPath, nil); err != nil {
return "", err
}
defer os.RemoveAll(tmpdirPath)
b.contextPath = tmpdirPath
filename := path.Join(tmpdirPath, "Dockerfile")
if _, err := os.Stat(filename); os.IsNotExist(err) {
return "", fmt.Errorf("Can't build a directory with no Dockerfile")
}
fileBytes, err := ioutil.ReadFile(filename)
if err != nil {
return "", err
}
if len(fileBytes) == 0 {
return "", ErrDockerfileEmpty
}
var (
dockerfile = lineContinuation.ReplaceAllString(stripComments(fileBytes), "")
stepN = 0
)
for _, line := range strings.Split(dockerfile, "\n") {
line = strings.Trim(strings.Replace(line, "\t", " ", -1), " \t\r\n")
if len(line) == 0 {
continue
}
if err := b.BuildStep(fmt.Sprintf("%d", stepN), line); err != nil {
if b.forceRm {
b.clearTmp(b.tmpContainers)
}
return "", err
} else if b.rm {
b.clearTmp(b.tmpContainers)
}
stepN += 1
}
if b.image != "" {
fmt.Fprintf(b.outStream, "Successfully built %s\n", utils.TruncateID(b.image))
return b.image, nil
}
return "", fmt.Errorf("No image was generated. This may be because the Dockerfile does not, like, do anything.\n")
}
func (b *Builder) readContext(context io.Reader) error {
tmpdirPath, err := ioutil.TempDir("", "docker-build")
if err != nil {
return err
}
decompressedStream, err := archive.DecompressStream(context)
if err != nil {
return err
}
b.context = &tarsum.TarSum{Reader: decompressedStream, DisableCompression: true}
if err := archive.Untar(b.context, tmpdirPath, nil); err != nil {
return err
}
b.contextPath = tmpdirPath
return nil
}
func (b *Builder) readContext(context io.Reader) error {
tmpdirPath, err := ioutil.TempDir("", "docker-build")
if err != nil {
return err
}
decompressedStream, err := archive.DecompressStream(context)
if err != nil {
return err
}
if b.context, err = tarsum.NewTarSum(decompressedStream, true, tarsum.Version0); err != nil {
return err
}
if err := archive.Untar(b.context, tmpdirPath, nil); err != nil {
return err
}
b.contextPath = tmpdirPath
return nil
}