зеркало из https://github.com/microsoft/docker.git
239 строки
5.9 KiB
Go
239 строки
5.9 KiB
Go
package docker
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"path"
|
|
"strings"
|
|
"time"
|
|
)
|
|
|
|
type Builder struct {
|
|
runtime *Runtime
|
|
repositories *TagStore
|
|
}
|
|
|
|
func NewBuilder(runtime *Runtime) *Builder {
|
|
return &Builder{
|
|
runtime: runtime,
|
|
repositories: runtime.repositories,
|
|
}
|
|
}
|
|
|
|
func (builder *Builder) Create(config *Config) (*Container, error) {
|
|
// Lookup image
|
|
img, err := builder.repositories.LookupImage(config.Image)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// Generate id
|
|
id := GenerateId()
|
|
// Generate default hostname
|
|
// FIXME: the lxc template no longer needs to set a default hostname
|
|
if config.Hostname == "" {
|
|
config.Hostname = id[:12]
|
|
}
|
|
|
|
container := &Container{
|
|
// FIXME: we should generate the ID here instead of receiving it as an argument
|
|
Id: id,
|
|
Created: time.Now(),
|
|
Path: config.Cmd[0],
|
|
Args: config.Cmd[1:], //FIXME: de-duplicate from config
|
|
Config: config,
|
|
Image: img.Id, // Always use the resolved image id
|
|
NetworkSettings: &NetworkSettings{},
|
|
// FIXME: do we need to store this in the container?
|
|
SysInitPath: sysInitPath,
|
|
}
|
|
container.root = builder.runtime.containerRoot(container.Id)
|
|
// Step 1: create the container directory.
|
|
// This doubles as a barrier to avoid race conditions.
|
|
if err := os.Mkdir(container.root, 0700); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// If custom dns exists, then create a resolv.conf for the container
|
|
if len(config.Dns) > 0 {
|
|
container.ResolvConfPath = path.Join(container.root, "resolv.conf")
|
|
f, err := os.Create(container.ResolvConfPath)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer f.Close()
|
|
for _, dns := range config.Dns {
|
|
if _, err := f.Write([]byte("nameserver " + dns + "\n")); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
} else {
|
|
container.ResolvConfPath = "/etc/resolv.conf"
|
|
}
|
|
|
|
// Step 2: save the container json
|
|
if err := container.ToDisk(); err != nil {
|
|
return nil, err
|
|
}
|
|
// Step 3: register the container
|
|
if err := builder.runtime.Register(container); 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")
|
|
}
|
|
config, err := ParseRun([]string{image.Id, "/bin/sh", "-c", tmp[1]}, nil, builder.runtime.capabilities)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Create the container and start it
|
|
c, err := builder.Create(config)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := c.Start(); 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()
|
|
|
|
config, err := ParseRun([]string{base.Id, "echo", "insert", tmp2[0], tmp2[1]}, nil, builder.runtime.capabilities)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
c, err := builder.Create(config)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := c.Start(); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Wait for echo to finish
|
|
if result := c.Wait(); result != 0 {
|
|
return fmt.Errorf("!!! '%s' return non-zero exit code '%d'. Aborting.", tmp[1], result)
|
|
}
|
|
|
|
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 {
|
|
fmt.Fprintf(stdout, "Build finished. image id: %s\n", base.Id)
|
|
} else {
|
|
fmt.Fprintf(stdout, "An error occured during the build\n")
|
|
}
|
|
return nil
|
|
}
|