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build: Restructure the kernel filter

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Stash the kernel image in a local buffer and
flush it out once done.

This is preparation work for supporting uncompressed
kernels in the next commit.

Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>
This commit is contained in:
Rolf Neugebauer 2018-11-03 21:40:29 +00:00
parent a33d8024cb
commit 4f0cec5c14
1 changed files with 17 additions and 4 deletions
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21
src/cmd/linuxkit/moby/build.go
View File

@ -257,6 +257,7 @@ func Build(m Moby, w io.Writer, pull bool, tp string) error {
type kernelFilter struct {
tw *tar.Writer
buffer *bytes.Buffer
hdr *tar.Header
cmdline string
kernel string
tar string
@ -288,6 +289,19 @@ func (k *kernelFilter) finishTar() error {
if k.buffer == nil {
return nil
}
if k.hdr != nil {
if err := k.tw.WriteHeader(k.hdr); err != nil {
return err
}
if _, err := k.tw.Write(k.buffer.Bytes()); err != nil {
return err
}
k.hdr = nil
k.buffer = nil
return nil
}
tr := tar.NewReader(k.buffer)
err := tarAppend(k.tw, tr)
k.buffer = nil
@ -362,15 +376,14 @@ func (k *kernelFilter) WriteHeader(hdr *tar.Header) error {
if err != nil {
return err
}
whdr = &tar.Header{
// Stash the kernel header and prime the buffer for the kernel
k.hdr = &tar.Header{
Name: "boot/kernel",
Mode: hdr.Mode,
Size: hdr.Size,
Format: tar.FormatPAX,
}
if err := tw.WriteHeader(whdr); err != nil {
return err
}
k.buffer = new(bytes.Buffer)
case k.tar:
k.foundKTar = true
k.discard = false