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Add backuptar.BasicInfoHeader helper function

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This is useful for creating tar headers for things that don't have backup
streams, such as links.
This commit is contained in:
John Starks
2016-03-30 12:38:06 -07:00
parent 3b18fb5af2
commit 346aee8003
1 changed files with 19 additions and 14 deletions
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backuptar/tar.go
+19 -14
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@@ -78,21 +78,10 @@ func copySparse(t *tar.Writer, br *winio.BackupStreamReader) error {
return nil
}
// WriteTarFileFromBackupStream writes a file to a tar writer using data from a Win32 backup stream.
//
// This encodes Win32 metadata as tar pax vendor extensions starting with MSWINDOWS.
//
// The additional Win32 metadata is:
//
// MSWINDOWS.fileattr: The Win32 file attributes, as a decimal value
//
// MSWINDOWS.sd: The Win32 security descriptor, in SDDL (string) format
//
// MSWINDOWS.mountpoint: If present, this is a mount point and not a symlink, even though the type is '2' (symlink)
func WriteTarFileFromBackupStream(t *tar.Writer, r io.Reader, name string, size int64, fileInfo *winio.FileBasicInfo) error {
name = filepath.ToSlash(name)
// BasicInfoHeader creates a tar header from basic file information.
func BasicInfoHeader(name string, size int64, fileInfo *winio.FileBasicInfo) *tar.Header {
hdr := &tar.Header{
Name: name,
Name: filepath.ToSlash(name),
Size: size,
Typeflag: tar.TypeReg,
ModTime: time.Unix(0, fileInfo.LastWriteTime.Nanoseconds()),
@@ -108,7 +97,23 @@ func WriteTarFileFromBackupStream(t *tar.Writer, r io.Reader, name string, size
hdr.Size = 0
hdr.Typeflag = tar.TypeDir
}
return hdr
}
// WriteTarFileFromBackupStream writes a file to a tar writer using data from a Win32 backup stream.
//
// This encodes Win32 metadata as tar pax vendor extensions starting with MSWINDOWS.
//
// The additional Win32 metadata is:
//
// MSWINDOWS.fileattr: The Win32 file attributes, as a decimal value
//
// MSWINDOWS.sd: The Win32 security descriptor, in SDDL (string) format
//
// MSWINDOWS.mountpoint: If present, this is a mount point and not a symlink, even though the type is '2' (symlink)
func WriteTarFileFromBackupStream(t *tar.Writer, r io.Reader, name string, size int64, fileInfo *winio.FileBasicInfo) error {
name = filepath.ToSlash(name)
hdr := BasicInfoHeader(name, size, fileInfo)
br := winio.NewBackupStreamReader(r)
var dataHdr *winio.BackupHeader
for dataHdr == nil {