diff options
| -rw-r--r-- | src/archive/tar/sparse_unix.go | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/src/archive/tar/sparse_unix.go b/src/archive/tar/sparse_unix.go index 76b4c6cc2b..4bc3482858 100644 --- a/src/archive/tar/sparse_unix.go +++ b/src/archive/tar/sparse_unix.go @@ -23,8 +23,12 @@ func sparseDetectUnix(f *os.File) (sph sparseHoles, err error) { const seekHole = 4 // SEEK_HOLE from unistd.h // Check for seekData/seekHole support. - if _, err := f.Seek(0, seekHole); errno(err) == syscall.EINVAL { - return nil, nil // Either old kernel or FS does not support this + // Different OS and FS may differ in the exact errno that is returned when + // there is no support. Rather than special-casing every possible errno + // representing "not supported", just assume that a non-nil error means + // that seekData/seekHole is not supported. + if _, err := f.Seek(0, seekHole); err != nil { + return nil, nil } // Populate the SparseHoles. |