fix Makefile test runner for Debian

[aspiers]

On Debian, python2 isn't in the $PATH, so falling back to python should at least get the tests running OK, even if the #!/usr/bin/env python2 will still break:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=634967

[aspiers]

plus, you should substitute $(PYTHON) into the tar_scm.py shebang.

Yeah, that's annoying but probably makes sense :-( So you are suggesting to have a tar_scm.py.in and do a typical autoconf-style substitution in the Makefile which generates tar_scm.py? That will require .spec file changes but I can't immediately think of a better way to ensure it works on both Debian and ArchLinux. I'm open to other ideas.

[roman-neuhauser]

yep, that's my suggestion; i don't see any other options.

[roman-neuhauser]

hm, python2.7 also looks like a viable alternative. would that work in Debian?

[aspiers]

I think it probably would - at least on my ancient Debian box here I see:

lrwxrwxrwx 1 root root 9 Oct 29  2012 /usr/bin/python -> python2.6*

[roman-neuhauser]

if you need to support both 2.7 and 2.6, then i guess $(call first_in_path,python2.7 python2.6) (maybe with python2 tacked on last) would be best.

[aspiers]

@roman-neuhauser How does this look now?

[roman-neuhauser]

if the sed fails it'll leave an empty or partial $(DESTDIR)$(mylibdir)/tar_scm behind. i'd suggest

sed ... tar_scm.py > tar_scm.tmp
install -m 0755 tar_scm.tmp $(DESTDIR)$(mylibdir)/tar_scm

[aspiers]

How's that?

[roman-neuhauser]

that looks fine, thanks!