docker/docker — pull request #8046 by vbatts (2014-09-15 18:49:37+00:00)
Title: archive: preserve hardlinks in Tar and Untar

```
benchmark old ns/op new ns/op delta
BenchmarkTarUntar 5662243 5615513 -0.83%

benchmark old MB/s new MB/s speedup
BenchmarkTarUntar 0.07 0.07 1.00x

benchmark old allocs new allocs delta
BenchmarkTarUntar 10815 10815 +0.00%

benchmark old bytes new bytes delta
BenchmarkTarUntar 520637 520216 -0.08%
```

ping @unclejack

Signed-off-by: Vincent Batts