Re: [Bug-tar] tar HEAD: difflink.at portability issue

[Pavel Raiskup]

On Thursday, April 26, 2018 7:01:05 PM CEST Christian Weisgerber wrote:
> In the tar 1.30 release there was a problem with the difflink.at
> test; this has been fixed in HEAD.  However, the test still fails
> on *BSD and there is an underlying portability issue.
> 
> The preparatory part of the test runs this:
> 
> mkdir a
> genfile -f a/x
> ln -s x a/y
> ln a/y a/z
> 
> What is the expected result?

It is regression test for 1bf590ab fix, which changed tar's reporting like:

  - a/z: Not linked to a/z
  + a/z: Not linked to a/y

So one could add ./configure check to detect that 'ln -P' works, and then
invent some test magic in difflink.at..  But IMO it would be fine enough
to just fix the test so it is working with regular-file hardlinks.

Pavel