mirror of https://github.com/octoleo/restic.git
120 lines
2.7 KiB
Go
120 lines
2.7 KiB
Go
package dump
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import (
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"archive/tar"
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"context"
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"io"
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"os"
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"path/filepath"
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"strings"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/restic"
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)
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type tarDumper struct {
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w *tar.Writer
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}
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// Statically ensure that tarDumper implements dumper.
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var _ dumper = tarDumper{}
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// WriteTar will write the contents of the given tree, encoded as a tar to the given destination.
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func WriteTar(ctx context.Context, repo restic.Repository, tree *restic.Tree, rootPath string, dst io.Writer) error {
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dmp := tarDumper{w: tar.NewWriter(dst)}
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return writeDump(ctx, repo, tree, rootPath, dmp, dst)
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}
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func (dmp tarDumper) Close() error {
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return dmp.w.Close()
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}
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// copied from archive/tar.FileInfoHeader
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const (
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// Mode constants from the USTAR spec:
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// See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13_06
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cISUID = 0o4000 // Set uid
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cISGID = 0o2000 // Set gid
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cISVTX = 0o1000 // Save text (sticky bit)
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)
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func (dmp tarDumper) dumpNode(ctx context.Context, node *restic.Node, repo restic.Repository) error {
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relPath, err := filepath.Rel("/", node.Path)
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if err != nil {
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return err
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}
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header := &tar.Header{
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Name: filepath.ToSlash(relPath),
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Size: int64(node.Size),
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Mode: int64(node.Mode.Perm()), // cIS* constants are added later
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Uid: int(node.UID),
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Gid: int(node.GID),
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Uname: node.User,
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Gname: node.Group,
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ModTime: node.ModTime,
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AccessTime: node.AccessTime,
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ChangeTime: node.ChangeTime,
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PAXRecords: parseXattrs(node.ExtendedAttributes),
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}
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// adapted from archive/tar.FileInfoHeader
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if node.Mode&os.ModeSetuid != 0 {
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header.Mode |= cISUID
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}
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if node.Mode&os.ModeSetgid != 0 {
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header.Mode |= cISGID
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}
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if node.Mode&os.ModeSticky != 0 {
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header.Mode |= cISVTX
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}
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if IsFile(node) {
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header.Typeflag = tar.TypeReg
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}
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if IsLink(node) {
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header.Typeflag = tar.TypeSymlink
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header.Linkname = node.LinkTarget
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}
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if IsDir(node) {
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header.Typeflag = tar.TypeDir
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header.Name += "/"
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}
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err = dmp.w.WriteHeader(header)
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if err != nil {
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return errors.Wrap(err, "TarHeader")
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}
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return GetNodeData(ctx, dmp.w, repo, node)
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}
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func parseXattrs(xattrs []restic.ExtendedAttribute) map[string]string {
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tmpMap := make(map[string]string)
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for _, attr := range xattrs {
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attrString := string(attr.Value)
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if strings.HasPrefix(attr.Name, "system.posix_acl_") {
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na := acl{}
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na.decode(attr.Value)
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if na.String() != "" {
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if strings.Contains(attr.Name, "system.posix_acl_access") {
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tmpMap["SCHILY.acl.access"] = na.String()
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} else if strings.Contains(attr.Name, "system.posix_acl_default") {
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tmpMap["SCHILY.acl.default"] = na.String()
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}
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}
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} else {
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tmpMap["SCHILY.xattr."+attr.Name] = attrString
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}
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}
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return tmpMap
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}
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