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moby--moby/builder.go
2013-05-06 16:00:30 -07:00

169 lines
4.1 KiB
Go

package docker
import (
"bufio"
"fmt"
"io"
"strings"
)
type Builder struct {
runtime *Runtime
}
func NewBuilder(runtime *Runtime) *Builder {
return &Builder{
runtime: runtime,
}
}
func (builder *Builder) Run(image *Image, cmd ...string) (*Container, error) {
// FIXME: pass a NopWriter instead of nil
config, err := ParseRun(append([]string{"-d", image.Id}, cmd...), nil, builder.runtime.capabilities)
if config.Image == "" {
return nil, fmt.Errorf("Image not specified")
}
if len(config.Cmd) == 0 {
return nil, fmt.Errorf("Command not specified")
}
if config.Tty {
return nil, fmt.Errorf("The tty mode is not supported within the builder")
}
// Create new container
container, err := builder.runtime.Create(config)
if err != nil {
return nil, err
}
if err := container.Start(); err != nil {
return nil, err
}
return container, nil
}
func (builder *Builder) Commit(container *Container, repository, tag, comment, author string) (*Image, error) {
return builder.runtime.Commit(container.Id, repository, tag, comment, author)
}
func (builder *Builder) clearTmp(containers, images map[string]struct{}) {
for c := range containers {
tmp := builder.runtime.Get(c)
builder.runtime.Destroy(tmp)
Debugf("Removing container %s", c)
}
for i := range images {
builder.runtime.graph.Delete(i)
Debugf("Removing image %s", i)
}
}
func (builder *Builder) Build(dockerfile io.Reader, stdout io.Writer) error {
var (
image, base *Image
tmpContainers map[string]struct{} = make(map[string]struct{})
tmpImages map[string]struct{} = make(map[string]struct{})
)
defer builder.clearTmp(tmpContainers, tmpImages)
file := bufio.NewReader(dockerfile)
for {
line, err := file.ReadString('\n')
if err != nil {
if err == io.EOF {
break
}
return err
}
line = strings.TrimSpace(line)
// Skip comments and empty line
if len(line) == 0 || line[0] == '#' {
continue
}
tmp := strings.SplitN(line, " ", 2)
if len(tmp) != 2 {
return fmt.Errorf("Invalid Dockerfile format")
}
switch tmp[0] {
case "from":
fmt.Fprintf(stdout, "FROM %s\n", tmp[1])
image, err = builder.runtime.repositories.LookupImage(tmp[1])
if err != nil {
return err
}
break
case "run":
fmt.Fprintf(stdout, "RUN %s\n", tmp[1])
if image == nil {
return fmt.Errorf("Please provide a source image with `from` prior to run")
}
// Create the container and start it
c, err := builder.Run(image, "/bin/sh", "-c", tmp[1])
if err != nil {
return err
}
tmpContainers[c.Id] = struct{}{}
// Wait for it to finish
if result := c.Wait(); result != 0 {
return fmt.Errorf("!!! '%s' return non-zero exit code '%d'. Aborting.", tmp[1], result)
}
// Commit the container
base, err = builder.Commit(c, "", "", "", "")
if err != nil {
return err
}
tmpImages[base.Id] = struct{}{}
fmt.Fprintf(stdout, "===> %s\n", base.ShortId())
break
case "copy":
if image == nil {
return fmt.Errorf("Please provide a source image with `from` prior to copy")
}
tmp2 := strings.SplitN(tmp[1], " ", 2)
if len(tmp) != 2 {
return fmt.Errorf("Invalid COPY format")
}
fmt.Fprintf(stdout, "COPY %s to %s in %s\n", tmp2[0], tmp2[1], base.ShortId())
file, err := Download(tmp2[0], stdout)
if err != nil {
return err
}
defer file.Body.Close()
c, err := builder.Run(base, "echo", "insert", tmp2[0], tmp2[1])
if err != nil {
return err
}
if err := c.Inject(file.Body, tmp2[1]); err != nil {
return err
}
base, err = builder.Commit(c, "", "", "", "")
if err != nil {
return err
}
fmt.Fprintf(stdout, "===> %s\n", base.ShortId())
break
default:
fmt.Fprintf(stdout, "Skipping unknown op %s\n", tmp[0])
}
}
if base != nil {
// The build is successful, keep the temporary containers and images
for i := range tmpImages {
delete(tmpImages, i)
}
for i := range tmpContainers {
delete(tmpContainers, i)
}
fmt.Fprintf(stdout, "Build finished. image id: %s\n", base.ShortId())
} else {
fmt.Fprintf(stdout, "An error occured during the build\n")
}
return nil
}