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7a7357dae1
This enables docker cp and ADD/COPY docker build support for LCOW. Originally, the graphdriver.Get() interface returned a local path to the container root filesystem. This does not work for LCOW, so the Get() method now returns an interface that LCOW implements to support copying to and from the container. Signed-off-by: Akash Gupta <akagup@microsoft.com>
73 lines
2 KiB
Go
73 lines
2 KiB
Go
package chrootarchive
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import (
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/idtools"
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)
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// NewArchiver returns a new Archiver which uses chrootarchive.Untar
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func NewArchiver(idMappings *idtools.IDMappings) *archive.Archiver {
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if idMappings == nil {
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idMappings = &idtools.IDMappings{}
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}
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return &archive.Archiver{
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Untar: Untar,
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IDMappingsVar: idMappings,
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}
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}
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// Untar reads a stream of bytes from `archive`, parses it as a tar archive,
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// and unpacks it into the directory at `dest`.
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// The archive may be compressed with one of the following algorithms:
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// identity (uncompressed), gzip, bzip2, xz.
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func Untar(tarArchive io.Reader, dest string, options *archive.TarOptions) error {
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return untarHandler(tarArchive, dest, options, true)
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}
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// UntarUncompressed reads a stream of bytes from `archive`, parses it as a tar archive,
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// and unpacks it into the directory at `dest`.
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// The archive must be an uncompressed stream.
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func UntarUncompressed(tarArchive io.Reader, dest string, options *archive.TarOptions) error {
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return untarHandler(tarArchive, dest, options, false)
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}
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// Handler for teasing out the automatic decompression
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func untarHandler(tarArchive io.Reader, dest string, options *archive.TarOptions, decompress bool) error {
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if tarArchive == nil {
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return fmt.Errorf("Empty archive")
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}
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if options == nil {
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options = &archive.TarOptions{}
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}
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if options.ExcludePatterns == nil {
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options.ExcludePatterns = []string{}
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}
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idMappings := idtools.NewIDMappingsFromMaps(options.UIDMaps, options.GIDMaps)
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rootIDs := idMappings.RootPair()
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dest = filepath.Clean(dest)
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if _, err := os.Stat(dest); os.IsNotExist(err) {
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if err := idtools.MkdirAllAndChownNew(dest, 0755, rootIDs); err != nil {
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return err
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}
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}
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r := ioutil.NopCloser(tarArchive)
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if decompress {
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decompressedArchive, err := archive.DecompressStream(tarArchive)
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if err != nil {
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return err
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}
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defer decompressedArchive.Close()
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r = decompressedArchive
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}
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return invokeUnpack(r, dest, options)
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}
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