mirror of
https://github.com/linuxkit/linuxkit.git
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moby: Factor out build code into a separate source file
Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
This commit is contained in:
Rolf Neugebauer
parent
4fbb787c6a
commit
a188c21ddd
133
src/cmd/moby/build.go
Normal file
133
src/cmd/moby/build.go
Normal file
@ -0,0 +1,133 @@
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package main
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import (
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"archive/tar"
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"bytes"
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"errors"
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"io"
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"log"
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"github.com/docker/moby/src/initrd"
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)
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const (
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docker2tar = "mobylinux/docker2tar:82a3f11f70b2959c7100dd6e184b511ebfc65908@sha256:e4fd36febc108477a2e5316d263ac257527779409891c7ac10d455a162df05c1"
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)
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func untarKernel(buf *bytes.Buffer, bzimageName, ktarName string) (*bytes.Buffer, *bytes.Buffer, error) {
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tr := tar.NewReader(buf)
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var bzimage, ktar *bytes.Buffer
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for {
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hdr, err := tr.Next()
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if err == io.EOF {
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break
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}
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if err != nil {
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log.Fatalln(err)
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}
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switch hdr.Name {
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case bzimageName:
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bzimage = new(bytes.Buffer)
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_, err := io.Copy(bzimage, tr)
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if err != nil {
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return nil, nil, err
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}
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case ktarName:
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ktar = new(bytes.Buffer)
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_, err := io.Copy(bzimage, tr)
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if err != nil {
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return nil, nil, err
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}
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default:
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continue
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}
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}
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if ktar == nil || bzimage == nil {
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return nil, nil, errors.New("did not find bzImage and kernel.tar in tarball")
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}
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return bzimage, ktar, nil
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}
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func containersInitrd(containers []*bytes.Buffer) (*bytes.Buffer, error) {
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w := new(bytes.Buffer)
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iw := initrd.NewWriter(w)
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defer iw.Close()
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for _, file := range containers {
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_, err := initrd.Copy(iw, file)
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if err != nil {
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return nil, err
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}
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}
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return w, nil
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}
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func build(m *Moby, name string) {
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containers := []*bytes.Buffer{}
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// get kernel bzImage and initrd tarball from container
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// TODO examine contents to see what names they might have
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const (
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bzimageName = "bzImage"
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ktarName = "kernel.tar"
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)
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out, err := dockerRun(m.Kernel.Image, "tar", "cf", "-", bzimageName, ktarName)
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if err != nil {
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log.Fatalf("Failed to extract kernel image and tarball: %v", err)
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}
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buf := bytes.NewBuffer(out)
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bzimage, ktar, err := untarKernel(buf, bzimageName, ktarName)
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if err != nil {
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log.Fatalf("Could not extract bzImage and kernel filesystem from tarball")
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}
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containers = append(containers, ktar)
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// convert init image to tarball
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init, err := dockerRun("-v", "/var/run/docker.sock:/var/run/docker.sock", docker2tar, m.Init)
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if err != nil {
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log.Fatalf("Failed to build init tarball: %v", err)
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}
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buffer := bytes.NewBuffer(init)
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containers = append(containers, buffer)
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for i, image := range m.System {
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args := ConfigToRun(i, "system", &image)
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out, err := dockerRun(args...)
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if err != nil {
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log.Fatalf("Failed to build container tarball: %v", err)
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}
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buffer := bytes.NewBuffer(out)
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containers = append(containers, buffer)
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}
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for i, image := range m.Daemon {
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args := ConfigToRun(i, "daemon", &image)
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out, err := dockerRun(args...)
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if err != nil {
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log.Fatalf("Failed to build container tarball: %v", err)
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}
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buffer := bytes.NewBuffer(out)
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containers = append(containers, buffer)
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}
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// add files
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buffer, err = filesystem(m)
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if err != nil {
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log.Fatalf("failed to add filesystem parts: %v", err)
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}
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containers = append(containers, buffer)
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initrd, err := containersInitrd(containers)
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if err != nil {
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log.Fatalf("Failed to make initrd %v", err)
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}
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err = outputs(m, name, bzimage.Bytes(), initrd.Bytes())
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if err != nil {
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log.Fatalf("Error writing outputs: %v", err)
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}
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}
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@ -1,8 +1,6 @@
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package main
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import (
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"archive/tar"
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"bytes"
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"errors"
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"flag"
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"fmt"
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@ -11,12 +9,6 @@ import (
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"log"
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"os/exec"
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"path/filepath"
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"github.com/docker/moby/src/initrd"
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)
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const (
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docker2tar = "mobylinux/docker2tar:82a3f11f70b2959c7100dd6e184b511ebfc65908@sha256:e4fd36febc108477a2e5316d263ac257527779409891c7ac10d455a162df05c1"
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)
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func dockerRun(args ...string) ([]byte, error) {
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@ -104,124 +96,6 @@ func dockerRunInput(input io.Reader, args ...string) ([]byte, error) {
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return stdout, nil
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}
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func untarKernel(buf *bytes.Buffer, bzimageName, ktarName string) (*bytes.Buffer, *bytes.Buffer, error) {
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tr := tar.NewReader(buf)
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var bzimage, ktar *bytes.Buffer
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for {
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hdr, err := tr.Next()
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if err == io.EOF {
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break
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}
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if err != nil {
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log.Fatalln(err)
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}
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switch hdr.Name {
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case bzimageName:
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bzimage = new(bytes.Buffer)
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_, err := io.Copy(bzimage, tr)
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if err != nil {
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return nil, nil, err
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}
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case ktarName:
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ktar = new(bytes.Buffer)
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_, err := io.Copy(bzimage, tr)
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if err != nil {
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return nil, nil, err
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}
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default:
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continue
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}
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}
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if ktar == nil || bzimage == nil {
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return nil, nil, errors.New("did not find bzImage and kernel.tar in tarball")
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}
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return bzimage, ktar, nil
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}
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func containersInitrd(containers []*bytes.Buffer) (*bytes.Buffer, error) {
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w := new(bytes.Buffer)
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iw := initrd.NewWriter(w)
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defer iw.Close()
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for _, file := range containers {
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_, err := initrd.Copy(iw, file)
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if err != nil {
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return nil, err
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}
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}
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return w, nil
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}
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func build(m *Moby, name string) {
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containers := []*bytes.Buffer{}
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// get kernel bzImage and initrd tarball from container
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// TODO examine contents to see what names they might have
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const (
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bzimageName = "bzImage"
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ktarName = "kernel.tar"
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)
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out, err := dockerRun(m.Kernel.Image, "tar", "cf", "-", bzimageName, ktarName)
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if err != nil {
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log.Fatalf("Failed to extract kernel image and tarball: %v", err)
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}
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buf := bytes.NewBuffer(out)
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bzimage, ktar, err := untarKernel(buf, bzimageName, ktarName)
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if err != nil {
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log.Fatalf("Could not extract bzImage and kernel filesystem from tarball")
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}
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containers = append(containers, ktar)
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// convert init image to tarball
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init, err := dockerRun("-v", "/var/run/docker.sock:/var/run/docker.sock", docker2tar, m.Init)
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if err != nil {
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log.Fatalf("Failed to build init tarball: %v", err)
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}
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buffer := bytes.NewBuffer(init)
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containers = append(containers, buffer)
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for i, image := range m.System {
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args := ConfigToRun(i, "system", &image)
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out, err := dockerRun(args...)
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if err != nil {
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log.Fatalf("Failed to build container tarball: %v", err)
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}
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buffer := bytes.NewBuffer(out)
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containers = append(containers, buffer)
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}
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for i, image := range m.Daemon {
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args := ConfigToRun(i, "daemon", &image)
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out, err := dockerRun(args...)
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if err != nil {
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log.Fatalf("Failed to build container tarball: %v", err)
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}
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buffer := bytes.NewBuffer(out)
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containers = append(containers, buffer)
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}
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// add files
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buffer, err = filesystem(m)
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if err != nil {
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log.Fatalf("failed to add filesystem parts: %v", err)
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}
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containers = append(containers, buffer)
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initrd, err := containersInitrd(containers)
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if err != nil {
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log.Fatalf("Failed to make initrd %v", err)
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}
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err = outputs(m, name, bzimage.Bytes(), initrd.Bytes())
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if err != nil {
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log.Fatalf("Error writing outputs: %v", err)
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}
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}
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var (
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conf string
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name string
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