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pkg/containerfs: delete Archiver, Driver

Browse source 
They were needed for Linux Containers on Windows, which is no longer
supported.

Signed-off-by: Cory Snider <csnider@mirantis.com>
This commit is contained in:
Cory Snider 2022-09-22 20:32:37 -04:00
parent a7c8fdc55b
commit e37a2d1879
4 changed files with 6 additions and 261 deletions
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6
builder/dockerfile/copy.go
View file

@ -449,7 +449,7 @@ func downloadSource(output io.Writer, stdout io.Writer, srcURL string) (remote b
type copyFileOptions struct {
decompress bool
identity *idtools.Identity
archiver Archiver
archiver *archive.Archiver
}
func performCopyForInfo(dest copyInfo, source copyInfo, options copyFileOptions) error {
@ -490,7 +490,7 @@ func performCopyForInfo(dest copyInfo, source copyInfo, options copyFileOptions)
return copyFile(archiver, srcPath, destPath, options.identity)
}
func copyDirectory(archiver Archiver, source, dest string, identity *idtools.Identity) error {
func copyDirectory(archiver *archive.Archiver, source, dest string, identity *idtools.Identity) error {
destExists, err := isExistingDirectory(dest)
if err != nil {
return errors.Wrapf(err, "failed to query destination path")
@ -505,7 +505,7 @@ func copyDirectory(archiver Archiver, source, dest string, identity *idtools.Ide
return nil
}
func copyFile(archiver Archiver, source, dest string, identity *idtools.Identity) error {
func copyFile(archiver *archive.Archiver, source, dest string, identity *idtools.Identity) error {
if identity == nil {
// Use system.MkdirAll here, which is a custom version of os.MkdirAll
// modified for use on Windows to handle volume GUID paths. These paths

51
builder/dockerfile/internals.go
View file

@ -7,7 +7,6 @@ import (
"crypto/sha256"
"encoding/hex"
"fmt"
"io"
"strings"
"github.com/docker/docker/api/types"
@ -17,8 +16,6 @@ import (
"github.com/docker/docker/image"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/chrootarchive"
"github.com/docker/docker/pkg/containerfs"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/go-connections/nat"
specs "github.com/opencontainers/image-spec/specs-go/v1"
@ -26,50 +23,8 @@ import (
"github.com/sirupsen/logrus"
)
// Archiver defines an interface for copying files from one destination to
// another using Tar/Untar.
type Archiver interface {
TarUntar(src, dst string) error
UntarPath(src, dst string) error
CopyWithTar(src, dst string) error
CopyFileWithTar(src, dst string) error
IdentityMapping() idtools.IdentityMapping
}
// The builder will use the following interfaces if the container fs implements
// these for optimized copies to and from the container.
type extractor interface {
ExtractArchive(src io.Reader, dst string, opts *archive.TarOptions) error
}
type archiver interface {
ArchivePath(src string, opts *archive.TarOptions) (io.ReadCloser, error)
}
// helper functions to get tar/untar func
func untarFunc(i interface{}) containerfs.UntarFunc {
if ea, ok := i.(extractor); ok {
return ea.ExtractArchive
}
return chrootarchive.Untar
}
func tarFunc(i interface{}) containerfs.TarFunc {
if ap, ok := i.(archiver); ok {
return ap.ArchivePath
}
return archive.TarWithOptions
}
func (b *Builder) getArchiver(src, dst containerfs.Driver) Archiver {
t, u := tarFunc(src), untarFunc(dst)
return &containerfs.Archiver{
SrcDriver: src,
DstDriver: dst,
Tar: t,
Untar: u,
IDMapping: b.idMapping,
}
func (b *Builder) getArchiver() *archive.Archiver {
return chrootarchive.NewArchiver(b.idMapping)
}
func (b *Builder) commit(dispatchState *dispatchState, comment string) error {
@ -205,7 +160,7 @@ func (b *Builder) performCopy(req dispatchRequest, inst copyInstruction) error {
for _, info := range inst.infos {
opts := copyFileOptions{
decompress: inst.allowLocalDecompression,
archiver: b.getArchiver(info.root, destInfo.root),
archiver: b.getArchiver(),
}
if !inst.preserveOwnership {
opts.identity = &identity

204
pkg/containerfs/archiver.go
View file

@ -1,204 +0,0 @@
package containerfs // import "github.com/docker/docker/pkg/containerfs"
import (
"archive/tar"
"errors"
"io"
"os"
"path/filepath"
"runtime"
"time"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/system"
"github.com/sirupsen/logrus"
)
// TarFunc provides a function definition for a custom Tar function
type TarFunc func(string, *archive.TarOptions) (io.ReadCloser, error)
// UntarFunc provides a function definition for a custom Untar function
type UntarFunc func(io.Reader, string, *archive.TarOptions) error
// Archiver provides a similar implementation of the archive.Archiver package with the rootfs abstraction
type Archiver struct {
SrcDriver Driver
DstDriver Driver
Tar TarFunc
Untar UntarFunc
IDMapping idtools.IdentityMapping
}
// TarUntar is a convenience function which calls Tar and Untar, with the output of one piped into the other.
// If either Tar or Untar fails, TarUntar aborts and returns the error.
func (archiver *Archiver) TarUntar(src, dst string) error {
logrus.Debugf("TarUntar(%s %s)", src, dst)
tarArchive, err := archiver.Tar(src, &archive.TarOptions{Compression: archive.Uncompressed})
if err != nil {
return err
}
defer tarArchive.Close()
options := &archive.TarOptions{
IDMap: archiver.IDMapping,
}
return archiver.Untar(tarArchive, dst, options)
}
// UntarPath untar a file from path to a destination, src is the source tar file path.
func (archiver *Archiver) UntarPath(src, dst string) error {
tarArchive, err := archiver.SrcDriver.Open(src)
if err != nil {
return err
}
defer tarArchive.Close()
options := &archive.TarOptions{
IDMap: archiver.IDMapping,
}
return archiver.Untar(tarArchive, dst, options)
}
// CopyWithTar creates a tar archive of filesystem path `src`, and
// unpacks it at filesystem path `dst`.
// The archive is streamed directly with fixed buffering and no
// intermediary disk IO.
func (archiver *Archiver) CopyWithTar(src, dst string) error {
srcSt, err := archiver.SrcDriver.Stat(src)
if err != nil {
return err
}
if !srcSt.IsDir() {
return archiver.CopyFileWithTar(src, dst)
}
// if this archiver is set up with ID mapping we need to create
// the new destination directory with the remapped root UID/GID pair
// as owner
identity := idtools.Identity{UID: archiver.IDMapping.RootPair().UID, GID: archiver.IDMapping.RootPair().GID}
// Create dst, copy src's content into it
if err := idtools.MkdirAllAndChownNew(dst, 0755, identity); err != nil {
return err
}
logrus.Debugf("Calling TarUntar(%s, %s)", src, dst)
return archiver.TarUntar(src, dst)
}
// CopyFileWithTar emulates the behavior of the 'cp' command-line
// for a single file. It copies a regular file from path `src` to
// path `dst`, and preserves all its metadata.
func (archiver *Archiver) CopyFileWithTar(src, dst string) (retErr error) {
logrus.Debugf("CopyFileWithTar(%s, %s)", src, dst)
srcDriver := archiver.SrcDriver
dstDriver := archiver.DstDriver
srcSt, retErr := srcDriver.Stat(src)
if retErr != nil {
return retErr
}
if srcSt.IsDir() {
return errors.New("cannot copy a directory")
}
// Clean up the trailing slash. This must be done in an operating
// system specific manner.
if dst[len(dst)-1] == dstDriver.Separator() {
dst = dstDriver.Join(dst, srcDriver.Base(src))
}
// The original call was system.MkdirAll, which is just
// os.MkdirAll on not-Windows and changed for Windows.
if runtime.GOOS == "windows" {
// Now we are WCOW
if err := system.MkdirAll(filepath.Dir(dst), 0700); err != nil {
return err
}
} else {
// We can just use the driver.MkdirAll function
if err := dstDriver.MkdirAll(dstDriver.Dir(dst), 0700); err != nil {
return err
}
}
r, w := io.Pipe()
errC := make(chan error, 1)
go func() {
defer close(errC)
errC <- func() error {
defer w.Close()
srcF, err := srcDriver.Open(src)
if err != nil {
return err
}
defer srcF.Close()
hdr, err := archive.FileInfoHeaderNoLookups(srcSt, "")
if err != nil {
return err
}
hdr.Format = tar.FormatPAX
hdr.ModTime = hdr.ModTime.Truncate(time.Second)
hdr.AccessTime = time.Time{}
hdr.ChangeTime = time.Time{}
hdr.Name = dstDriver.Base(dst)
if runtime.GOOS == "windows" {
hdr.Mode = int64(chmodTarEntry(os.FileMode(hdr.Mode)))
} else {
hdr.Mode = int64(os.FileMode(hdr.Mode))
}
if err := remapIDs(archiver.IDMapping, hdr); err != nil {
return err
}
tw := tar.NewWriter(w)
defer tw.Close()
if err := tw.WriteHeader(hdr); err != nil {
return err
}
if _, err := io.Copy(tw, srcF); err != nil {
return err
}
return nil
}()
}()
defer func() {
if err := <-errC; retErr == nil && err != nil {
retErr = err
}
}()
retErr = archiver.Untar(r, dstDriver.Dir(dst), nil)
if retErr != nil {
r.CloseWithError(retErr)
}
return retErr
}
// IdentityMapping returns the IdentityMapping of the archiver.
func (archiver *Archiver) IdentityMapping() idtools.IdentityMapping {
return archiver.IDMapping
}
func remapIDs(idMapping idtools.IdentityMapping, hdr *tar.Header) error {
ids, err := idMapping.ToHost(idtools.Identity{UID: hdr.Uid, GID: hdr.Gid})
hdr.Uid, hdr.Gid = ids.UID, ids.GID
return err
}
// chmodTarEntry is used to adjust the file permissions used in tar header based
// on the platform the archival is done.
func chmodTarEntry(perm os.FileMode) os.FileMode {
// perm &= 0755 // this 0-ed out tar flags (like link, regular file, directory marker etc.)
permPart := perm & os.ModePerm
noPermPart := perm &^ os.ModePerm
// Add the x bit: make everything +x from windows
permPart |= 0111
permPart &= 0755
return noPermPart | permPart
}

6
pkg/containerfs/containerfs.go
View file

@ -14,12 +14,6 @@ type ContainerFS interface {
// on the local system, so the continuity operations must be used
Path() string
Driver
}
// Driver combines both continuity's Driver and PathDriver interfaces with a Platform
// field to determine the OS.
type Driver interface {
// Driver & PathDriver provide methods to manipulate files & paths
driver.Driver
pathdriver.PathDriver