archive/tar changes between go1.8 and go1.9rc1

gistfile1.txt

$ git log origin/release-branch.go1.8..origin/release-branch.go1.9 src/archive/tar
commit c991d2ab14496789146560608c5756d5d83b35f6
Author: Joe Tsai <joetsai@digital-static.net>
Date:   Tue Jun 27 17:30:39 2017 -0700

    archive/tar: use best effort at writing USTAR header
    
    Prior to this change, if the Writer needed to use the PAX format, it would
    output a USTAR header with an empty name. This should be okay since the PAX
    specification dictates that the PAX record for "path" should override the
    semantic meaning of any of the old USTAR fields.
    
    Unfortunately, the implementation of tar on OpenBSD 6.1 is too strict with
    their handling of PAX files such that they check for the validity of this
    bogus field even though the PAX header is present.
    
    To allow Go's Writer output be parsible by OpenBSD's tar utility,
    we write a best-effort (ASCII-only and truncated) version of the original
    file name. Note that this still fails in some edge-cases (for example,
    a Chinese filename containing all non-ASCII characters). OpenBSD should really
    relax their checking, as you honestly can't always expect a sensible path
    to be generated when USTAR cannot handle the original path.
    
    Fixes #20707
    
    Change-Id: Id7d77349023d2152d7291d582cd050b6681760e4
    Reviewed-on: https://go-review.googlesource.com/46914
    Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: Ian Lance Taylor <iant@golang.org>

commit 66b5a2f3f0b1d94f69763114a85a977f5bc0277a
Author: Lars Jeppesen <jeppesen.lars@gmail.com>
Date:   Sat Apr 29 23:25:34 2017 +0200

    archive/tar: remove file type bits from mode field
    
    When writing tar files by using the FileInfoHeader
    the type bits was set in the mode field of the header
    This is not correct according to the standard (GNU/Posix) and
    other implementations.
    
    Fixed #20150
    
    Change-Id: I3be7d946a1923ad5827cf45c696546a5e287ebba
    Reviewed-on: https://go-review.googlesource.com/42093
    Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
    Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
    TryBot-Result: Gobot Gobot <gobot@golang.org>

commit 1989921aef60c83e6f9127a8448fb5ede10e9acc
Author: Alex Brainman <alex.brainman@gmail.com>
Date:   Wed Apr 26 14:49:58 2017 +1000

    os: do not report ModeDir for symlinks on windows
    
    When using Lstat against symlinks that point to a directory,
    the function returns FileInfo with both ModeDir and ModeSymlink set.
    Change that to never set ModeDir if ModeSymlink is set.
    
    Fixes #10424
    Fixes #17540
    Fixes #17541
    
    Change-Id: Iba280888aad108360b8c1f18180a24493fe7ad2b
    Reviewed-on: https://go-review.googlesource.com/41830
    Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
    Reviewed-by: Ian Lance Taylor <iant@golang.org>
    Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
    TryBot-Result: Gobot Gobot <gobot@golang.org>

commit cf3a28124b199d15b7e968327ba07d45f2f24a88
Author: Alex Brainman <alex.brainman@gmail.com>
Date:   Tue Apr 4 17:09:17 2017 +1000

    archive/tar: extend TestFileInfoHeaderSymlink
    
    For #17541.
    
    Change-Id: I524ab194f32b8b061ce1c9c3e0cd34cc5539358e
    Reviewed-on: https://go-review.googlesource.com/39410
    Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
    Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

commit 0e3355903d2ebcf5ee9e76096f51ac9a116a9dbb
Author: Russ Cox <rsc@golang.org>
Date:   Thu Feb 2 16:20:58 2017 -0500

    time: record monotonic clock reading in time.Now, for more accurate comparisons
    
    See https://golang.org/design/12914-monotonic for details.
    
    Fixes #12914.
    
    Change-Id: I80edc2e6c012b4ace7161c84cf067d444381a009
    Reviewed-on: https://go-review.googlesource.com/36255
    Run-TryBot: Russ Cox <rsc@golang.org>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: Caleb Spare <cespare@gmail.com>
    Reviewed-by: Ian Lance Taylor <iant@golang.org>