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moby--moby/builder.go
Guillaume J. Charmes 96069de4e0 Add build command
2013-05-06 16:44:37 -07:00

131 lines
3.1 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([]string{"-d", image.Id, "/bin/sh", "-c", 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) runCommit(image *Image, cmd string) (*Image, error) {
c, err := builder.run(image, cmd)
if err != nil {
return nil, err
}
if result := c.Wait(); result != 0 {
return nil, fmt.Errorf("!!! '%s' return non-zero exit code '%d'. Aborting.", cmd, result)
}
img, err := builder.runtime.Commit(c.Id, "", "", "", "")
if err != nil {
return nil, err
}
return img, nil
}
func (builder *Builder) Build(dockerfile io.Reader, stdout io.Writer) error {
var image, base *Image
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 {
if builder.runtime.graph.IsNotExist(err) {
var tag, remote string
if strings.Contains(remote, ":") {
remoteParts := strings.Split(remote, ":")
tag = remoteParts[1]
remote = remoteParts[0]
}
if err := builder.runtime.graph.PullRepository(stdout, remote, tag, builder.runtime.repositories, builder.runtime.authConfig); err != nil {
return nil, err
}
image, err = builder.runtime.repositories.LookupImage(arguments)
if err != nil {
return nil, err
}
} else {
return nil, 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")
}
base, err = builder.runCommit(image, tmp[1])
if err != nil {
return err
}
fmt.Fprintf(stdout, "===> %s\n", base.Id)
break
case "copy":
return fmt.Errorf("The copy operator has not yet been implemented")
default:
fmt.Fprintf(stdout, "Skipping unknown op %s\n", tmp[0])
}
}
if base != nil {
fmt.Fprintf(stdout, "Build finished. image id: %s\n", base.Id)
} else {
fmt.Fprintf(stdout, "An error occured during the build\n")
}
return nil
}