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Write the initrd incrementally

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Slightly better for demo flow as no long pause at the end

Signed-off-by: Justin Cormack <justin.cormack@docker.com>
This commit is contained in:
Justin Cormack 2017-04-07 11:37:40 +01:00
parent 2cce03f19e
commit be9ee95c4c
1 changed files with 17 additions and 25 deletions
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42
src/cmd/moby/build.go
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@ -42,6 +42,13 @@ func build(args []string) {
buildInternal(*buildName, *buildPull, conf)
}
func initrdAppend(iw *initrd.Writer, r io.Reader) {
_, err := initrd.Copy(iw, r)
if err != nil {
log.Fatalf("initrd write error: %v", err)
}
}
// Perform the actual build process
func buildInternal(name string, pull bool, conf string) {
if name == "" {
@ -62,7 +69,8 @@ func buildInternal(name string, pull bool, conf string) {
log.Fatalf("Invalid config: %v", err)
}
containers := []*bytes.Buffer{}
w := new(bytes.Buffer)
iw := initrd.NewWriter(w)
if pull {
log.Infof("Pull kernel image: %s", m.Kernel.Image)
@ -87,7 +95,7 @@ func buildInternal(name string, pull bool, conf string) {
if err != nil {
log.Fatalf("Could not extract bzImage and kernel filesystem from tarball. %v", err)
}
containers = append(containers, ktar)
initrdAppend(iw, ktar)
// convert init image to tarball
if pull {
@ -103,7 +111,7 @@ func buildInternal(name string, pull bool, conf string) {
log.Fatalf("Failed to build init tarball: %v", err)
}
buffer := bytes.NewBuffer(init)
containers = append(containers, buffer)
initrdAppend(iw, buffer)
log.Infof("Add system containers:")
for i, image := range m.System {
@ -126,7 +134,7 @@ func buildInternal(name string, pull bool, conf string) {
log.Fatalf("Failed to extract root filesystem for %s: %v", image.Image, err)
}
buffer := bytes.NewBuffer(out)
containers = append(containers, buffer)
initrdAppend(iw, buffer)
}
log.Infof("Add daemon containers:")
@ -149,7 +157,7 @@ func buildInternal(name string, pull bool, conf string) {
log.Fatalf("Failed to extract root filesystem for %s: %v", image.Image, err)
}
buffer := bytes.NewBuffer(out)
containers = append(containers, buffer)
initrdAppend(iw, buffer)
}
// add files
@ -157,16 +165,14 @@ func buildInternal(name string, pull bool, conf string) {
if err != nil {
log.Fatalf("failed to add filesystem parts: %v", err)
}
containers = append(containers, buffer)
log.Infof("Create initial ram disk")
initrd, err := containersInitrd(containers)
initrdAppend(iw, buffer)
err = iw.Close()
if err != nil {
log.Fatalf("Failed to make initrd %v", err)
log.Fatalf("initrd close error: %v", err)
}
log.Infof("Create outputs:")
err = outputs(m, name, bzimage.Bytes(), initrd.Bytes())
err = outputs(m, name, bzimage.Bytes(), w.Bytes())
if err != nil {
log.Fatalf("Error writing outputs: %v", err)
}
@ -209,17 +215,3 @@ func untarKernel(buf *bytes.Buffer, bzimageName, ktarName string) (*bytes.Buffer
return bzimage, ktar, nil
}
func containersInitrd(containers []*bytes.Buffer) (*bytes.Buffer, error) {
w := new(bytes.Buffer)
iw := initrd.NewWriter(w)
defer iw.Close()
for _, file := range containers {
_, err := initrd.Copy(iw, file)
if err != nil {
return nil, err
}
}
return w, nil
}