[Bug 1715753] [NEW] ln --relative broken on u14, works on u16

[Scott Mcdermott]

Public bug reported:

in ubuntu14, the behavior of "ln --relative" seems to be quite broken.
on ubuntu 16 it works as expected.  can we please backport whatever fix
from u16 or update coreutils? 8.15 is where they started including the
'realpath' binary, maybe they fixed "ln --relative" too.

u14 INCORRECT:

$ loop=0; nloops=4; base=/tmp/lntest; rm -rf $base/ && mkdir -p $base/dir &&
touch $base/dir/file && while ((loop++ < nloops)); do ln -frs $base/dir/file $base/link; readlink -f $base/link; sleep 1; done
/tmp/lntest/dir/file
/tmp/lntest/file
/tmp/lntest/dir/file
/tmp/lntest/file

u16 CORRECT:

$ loop=0; nloops=4; base=/tmp/lntest; rm -rf $base/ && mkdir -p $base/dir &&
touch $base/dir/file && while ((loop++ < nloops)); do ln -frs $base/dir/file $base/link; readlink -f $base/link; sleep 1; done
/tmp/lntest/dir/file
/tmp/lntest/dir/file
/tmp/lntest/dir/file
/tmp/lntest/dir/file

** Affects: coreutils (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  in ubuntu14, the behavior of "ln --relative" seems to be quite broken.
  on ubuntu 16 it works as expected.  can we please backport whatever fix
  from u16 or update coreutils? 8.15 is where they started including the
  'realpath' binary, maybe they fixed "ln --relative" too.
  
  u14 INCORRECT:
  
- $ loop=0; nloops=4; base=/tmp/lntest; rm -rf $base/ && mkdir -p $base/dir && touch $base/dir/file && while ((loop++ < nloops)); do ln <-frs $base/dir/file $base/link; readlink -f $base/link; sleep 1; done
+ $ loop=0; nloops=4; base=/tmp/lntest; rm -rf $base/ && mkdir -p $base/dir &&
+ touch $base/dir/file && while ((loop++ < nloops)); do ln -frs $base/dir/file $base/link; readlink -f $base/link; sleep 1; done
  /tmp/lntest/dir/file
  /tmp/lntest/file
  /tmp/lntest/dir/file
  /tmp/lntest/file
  
  u16 CORRECT:
  
- $ loop=0; nloops=4; base=/tmp/lntest; rm -rf $base/ && mkdir -p $base/dir && touch $base/dir/file && while ((loop++ < nloops)); do ln <-frs $base/dir/file $base/link; readlink -f $base/link; sleep 1; done
+ $ loop=0; nloops=4; base=/tmp/lntest; rm -rf $base/ && mkdir -p $base/dir &&
+ touch $base/dir/file && while ((loop++ < nloops)); do ln -frs $base/dir/file $base/link; readlink -f $base/link; sleep 1; done
  /tmp/lntest/dir/file
  /tmp/lntest/dir/file
  /tmp/lntest/dir/file
  /tmp/lntest/dir/file

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https://bugs.launchpad.net/bugs/1715753

Title:
  ln --relative broken on u14, works on u16

Status in coreutils package in Ubuntu:
  New

Bug description:
  in ubuntu14, the behavior of "ln --relative" seems to be quite broken.
  on ubuntu 16 it works as expected.  can we please backport whatever
  fix from u16 or update coreutils? 8.15 is where they started including
  the 'realpath' binary, maybe they fixed "ln --relative" too.

  u14 INCORRECT:

  $ loop=0; nloops=4; base=/tmp/lntest; rm -rf $base/ && mkdir -p $base/dir &&
  touch $base/dir/file && while ((loop++ < nloops)); do ln -frs $base/dir/file $base/link; readlink -f $base/link; sleep 1; done
  /tmp/lntest/dir/file
  /tmp/lntest/file
  /tmp/lntest/dir/file
  /tmp/lntest/file

  u16 CORRECT:

  $ loop=0; nloops=4; base=/tmp/lntest; rm -rf $base/ && mkdir -p $base/dir &&
  touch $base/dir/file && while ((loop++ < nloops)); do ln -frs $base/dir/file $base/link; readlink -f $base/link; sleep 1; done
  /tmp/lntest/dir/file
  /tmp/lntest/dir/file
  /tmp/lntest/dir/file
  /tmp/lntest/dir/file

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