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build: Fix the ModTime for files created during build

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When creating files for the "intermediate" tar ball,
fix the ModTime. This reduces the difference between
LinuxKit images build from identical inputs.

Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>
This commit is contained in:
Rolf Neugebauer 2018-12-22 16:52:48 +00:00
parent 1616b18fb0
commit 02579b22e5
4 changed files with 83 additions and 57 deletions
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50
src/cmd/linuxkit/moby/build.go
View File

@ -51,10 +51,11 @@ var additions = map[string]addFun{
"docker": func(tw *tar.Writer) error {
log.Infof(" Adding Dockerfile")
hdr := &tar.Header{
Name: "Dockerfile",
Mode: 0644,
Size: int64(len(dockerfile)),
Format: tar.FormatPAX,
Name: "Dockerfile",
Mode: 0644,
Size: int64(len(dockerfile)),
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
if err := tw.WriteHeader(hdr); err != nil {
return err
@ -368,6 +369,7 @@ func (k *kernelFilter) WriteHeader(hdr *tar.Header) error {
Name: "boot",
Mode: 0755,
Typeflag: tar.TypeDir,
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
if err := tw.WriteHeader(whdr); err != nil {
@ -376,10 +378,11 @@ func (k *kernelFilter) WriteHeader(hdr *tar.Header) error {
}
// add the cmdline in /boot/cmdline
whdr := &tar.Header{
Name: "boot/cmdline",
Mode: 0644,
Size: int64(len(k.cmdline)),
Format: tar.FormatPAX,
Name: "boot/cmdline",
Mode: 0644,
Size: int64(len(k.cmdline)),
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
if err := tw.WriteHeader(whdr); err != nil {
return err
@ -391,10 +394,11 @@ func (k *kernelFilter) WriteHeader(hdr *tar.Header) error {
}
// 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,
Name: "boot/kernel",
Mode: hdr.Mode,
Size: hdr.Size,
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
k.buffer = new(bytes.Buffer)
case k.tar:
@ -410,6 +414,7 @@ func (k *kernelFilter) WriteHeader(hdr *tar.Header) error {
Name: "boot",
Mode: 0755,
Typeflag: tar.TypeDir,
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
if err := tw.WriteHeader(whdr); err != nil {
@ -417,10 +422,11 @@ func (k *kernelFilter) WriteHeader(hdr *tar.Header) error {
}
}
whdr := &tar.Header{
Name: "boot/ucode.cpio",
Mode: hdr.Mode,
Size: hdr.Size,
Format: tar.FormatPAX,
Name: "boot/ucode.cpio",
Mode: hdr.Mode,
Size: hdr.Size,
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
if err := tw.WriteHeader(whdr); err != nil {
return err
@ -653,6 +659,7 @@ func filesystem(m Moby, tw *tar.Writer, idMap map[string]uint32) error {
Name: root,
Typeflag: tar.TypeDir,
Mode: dirMode,
ModTime: defaultModTime,
Uid: int(uid),
Gid: int(gid),
Format: tar.FormatPAX,
@ -666,11 +673,12 @@ func filesystem(m Moby, tw *tar.Writer, idMap map[string]uint32) error {
}
addedFiles[f.Path] = true
hdr := &tar.Header{
Name: f.Path,
Mode: mode,
Uid: int(uid),
Gid: int(gid),
Format: tar.FormatPAX,
Name: f.Path,
Mode: mode,
ModTime: defaultModTime,
Uid: int(uid),
Gid: int(gid),
Format: tar.FormatPAX,
}
if f.Directory {
if f.Contents != nil {

24
src/cmd/linuxkit/moby/image.go
View File

@ -71,6 +71,7 @@ func tarPrefix(path string, tw tarWriter) error {
hdr := &tar.Header{
Name: mkdir,
Mode: 0755,
ModTime: defaultModTime,
Typeflag: tar.TypeDir,
Format: tar.FormatPAX,
}
@ -154,6 +155,7 @@ func ImageTar(ref *reference.Spec, prefix string, tw tarWriter, trust bool, pull
contents := replace[hdr.Name]
hdr.Size = int64(len(contents))
hdr.Name = prefix + hdr.Name
hdr.ModTime = defaultModTime
log.Debugf("image tar: %s %s add %s", ref, prefix, hdr.Name)
if err := tw.WriteHeader(hdr); err != nil {
return err
@ -169,6 +171,7 @@ func ImageTar(ref *reference.Spec, prefix string, tw tarWriter, trust bool, pull
hdr.Size = 0
hdr.Typeflag = tar.TypeSymlink
hdr.Linkname = resolv
hdr.ModTime = defaultModTime
log.Debugf("image tar: %s %s add resolv symlink /etc/resolv.conf -> %s", ref, prefix, resolv)
if err := tw.WriteHeader(hdr); err != nil {
return err
@ -221,10 +224,11 @@ func ImageBundle(prefix string, ref *reference.Spec, config []byte, runtime Runt
}
hdr := &tar.Header{
Name: path.Join(prefix, "config.json"),
Mode: 0644,
Size: int64(len(config)),
Format: tar.FormatPAX,
Name: path.Join(prefix, "config.json"),
Mode: 0644,
Size: int64(len(config)),
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
if err := tw.WriteHeader(hdr); err != nil {
return err
@ -242,6 +246,7 @@ func ImageBundle(prefix string, ref *reference.Spec, config []byte, runtime Runt
Name: tmp,
Mode: 0755,
Typeflag: tar.TypeDir,
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
if err := tw.WriteHeader(hdr); err != nil {
@ -252,6 +257,7 @@ func ImageBundle(prefix string, ref *reference.Spec, config []byte, runtime Runt
Name: path.Join(prefix, "rootfs"),
Mode: 0755,
Typeflag: tar.TypeDir,
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
if err := tw.WriteHeader(hdr); err != nil {
@ -271,6 +277,7 @@ func ImageBundle(prefix string, ref *reference.Spec, config []byte, runtime Runt
Name: path.Join(prefix, "rootfs"),
Mode: 0755,
Typeflag: tar.TypeDir,
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
if err := tw.WriteHeader(hdr); err != nil {
@ -294,10 +301,11 @@ func ImageBundle(prefix string, ref *reference.Spec, config []byte, runtime Runt
}
hdr = &tar.Header{
Name: path.Join(prefix, "runtime.json"),
Mode: 0644,
Size: int64(len(runtimeConfig)),
Format: tar.FormatPAX,
Name: path.Join(prefix, "runtime.json"),
Mode: 0644,
Size: int64(len(runtimeConfig)),
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
if err := tw.WriteHeader(hdr); err != nil {
return err

63
src/cmd/linuxkit/moby/output.go
View File

@ -281,10 +281,11 @@ func tarInitrdKernel(kernel, initrd []byte, cmdline string) (*bytes.Buffer, erro
buf := new(bytes.Buffer)
tw := tar.NewWriter(buf)
hdr := &tar.Header{
Name: "kernel",
Mode: 0600,
Size: int64(len(kernel)),
Format: tar.FormatPAX,
Name: "kernel",
Mode: 0600,
Size: int64(len(kernel)),
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
err := tw.WriteHeader(hdr)
if err != nil {
@ -295,10 +296,11 @@ func tarInitrdKernel(kernel, initrd []byte, cmdline string) (*bytes.Buffer, erro
return buf, err
}
hdr = &tar.Header{
Name: "initrd.img",
Mode: 0600,
Size: int64(len(initrd)),
Format: tar.FormatPAX,
Name: "initrd.img",
Mode: 0600,
Size: int64(len(initrd)),
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
err = tw.WriteHeader(hdr)
if err != nil {
@ -309,10 +311,11 @@ func tarInitrdKernel(kernel, initrd []byte, cmdline string) (*bytes.Buffer, erro
return buf, err
}
hdr = &tar.Header{
Name: "cmdline",
Mode: 0600,
Size: int64(len(cmdline)),
Format: tar.FormatPAX,
Name: "cmdline",
Mode: 0600,
Size: int64(len(cmdline)),
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
err = tw.WriteHeader(hdr)
if err != nil {
@ -410,10 +413,11 @@ func outputKernelInitrdTarball(base string, kernel []byte, initrd []byte, cmdlin
tw := tar.NewWriter(f)
if len(kernel) != 0 {
hdr := &tar.Header{
Name: "kernel",
Mode: 0644,
Size: int64(len(kernel)),
Format: tar.FormatPAX,
Name: "kernel",
Mode: 0644,
Size: int64(len(kernel)),
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
if err := tw.WriteHeader(hdr); err != nil {
return err
@ -424,10 +428,11 @@ func outputKernelInitrdTarball(base string, kernel []byte, initrd []byte, cmdlin
}
if len(initrd) != 0 {
hdr := &tar.Header{
Name: "initrd.img",
Mode: 0644,
Size: int64(len(initrd)),
Format: tar.FormatPAX,
Name: "initrd.img",
Mode: 0644,
Size: int64(len(initrd)),
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
if err := tw.WriteHeader(hdr); err != nil {
return err
@ -438,10 +443,11 @@ func outputKernelInitrdTarball(base string, kernel []byte, initrd []byte, cmdlin
}
if len(cmdline) != 0 {
hdr := &tar.Header{
Name: "cmdline",
Mode: 0644,
Size: int64(len(cmdline)),
Format: tar.FormatPAX,
Name: "cmdline",
Mode: 0644,
Size: int64(len(cmdline)),
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
if err := tw.WriteHeader(hdr); err != nil {
return err
@ -452,10 +458,11 @@ func outputKernelInitrdTarball(base string, kernel []byte, initrd []byte, cmdlin
}
if len(ucode) != 0 {
hdr := &tar.Header{
Name: "ucode.cpio",
Mode: 0644,
Size: int64(len(ucode)),
Format: tar.FormatPAX,
Name: "ucode.cpio",
Mode: 0644,
Size: int64(len(ucode)),
ModTime: defaultModTime,
Format: tar.FormatPAX,
}
if err := tw.WriteHeader(hdr); err != nil {
return err

3
src/cmd/linuxkit/moby/util.go
View File

@ -2,11 +2,14 @@ package moby
import (
"path/filepath"
"time"
)
var (
// MobyDir is the location of the cache directory, defaults to ~/.moby
MobyDir string
// Default ModTime for files created during build. Roughly the time LinuxKit got open sourced.
defaultModTime = time.Date(2017, time.April, 18, 16, 30, 0, 0, time.UTC)
)
func defaultMobyConfigDir() string {