--- a/mercurial/util.py Thu Apr 05 11:33:36 2018 -0700 +++ b/mercurial/util.py Thu Apr 05 10:13:01 2018 -0400 @@ -1544,6 +1544,7 @@ # a whilelist of known filesystems where hardlink works reliably _hardlinkfswhitelist = { + 'apfs', 'btrfs', 'ext2', 'ext3',