OpenBSD tar is not detected

[blackgnezdo]

When running stack I get this error:

2021-05-09 21:20:54.625664: [debug] Run process within /tmp/with-repo54077/cloned: /bin/tar --version
2021-05-09 21:20:54.975595: [error] Received ExitFailure 1 when running
Raw command: /bin/tar --version
Run from: /tmp/with-repo54077/cloned
Standard error:

tar: unknown option -- -
usage: tar {crtux}[014578befHhjLmNOoPpqsvwXZz]
           [blocking-factor | archive | replstr] [-C directory] [-I file]
           [file ...]
       tar {-crtux} [-014578eHhjLmNOoPpqvwXZz] [-b blocking-factor]
           [-C directory] [-f archive] [-I file] [-s replstr] [file ...]

I suspect this is due to pantry trying to work out the tar version. I doubt --version is in any relevant standard that OpenBSD follows, so tar exits with error code 1 in such cases.

[snoyberg]

I'm not familiar with OpenBSD tar, but I'm guessing the BSD variant here would be the sensible default. Can you confirm?

@psibi any thoughts on modifying this code to always choose BSD in the case of failing to parse the --version string, for any reason?

[psibi]

any thoughts on modifying this code to always choose BSD in the case of failing to parse the --version string, for any reason?

Yeah, that sounds good to me.