@ndowens, thanks for your PR! By analyzing the history of the files in this pull request, we identified @bobvanderlinden to be a potential reviewer.

Hello,
I tried to build that and run the binaries produced. hwinfo works fine :

[demo@nixos:~/testbuilds/hwinfo]$ ./result/bin/hwinfo --version
21.38

But two other commands gives unexpected results :

[demo@nixos:~/testbuilds/hwinfo]$ ./result/bin/mk_isdnhwdb
Cannot open /usr/share/hwinfo/ISDN.CDB.txt as stdin

The path /usr/share does not exist under NixOS.

[demo@nixos:~/testbuilds/hwinfo]$ ./result/bin/convert_hd
Can't locate XML/Writer.pm in @inc (you may need to install the XML::Writer module) (@inc contains: /home/demo/.nix-profile/lib/perl5/site_perl /nix/var/nix/profiles/default/lib/perl5/site_perl /run/current-system/sw/lib/perl5/site_perl/5.22.2/x86_64-linux-thread-multi /run/current-system/sw/lib/perl5/site_perl/5.22.2 /run/current-system/sw/lib/perl5/site_perl /nix/store/p7k810475bbk0v9wi418sz8jh3dzlpiz-perl-5.22.2/lib/perl5/site_perl/5.22.2/x86_64-linux-thread-multi /nix/store/p7k810475bbk0v9wi418sz8jh3dzlpiz-perl-5.22.2/lib/perl5/site_perl/5.22.2 /nix/store/p7k810475bbk0v9wi418sz8jh3dzlpiz-perl-5.22.2/lib/perl5/5.22.2/x86_64-linux-thread-multi /nix/store/p7k810475bbk0v9wi418sz8jh3dzlpiz-perl-5.22.2/lib/perl5/5.22.2 .) at ./result/bin/convert_hd line 4.
BEGIN failed--compilation aborted at ./result/bin/convert_hd line 4.

A Perl module is missing.

The two other commands, did they work before? (If this PR does not cause regressions, we merge it even if some things are broken.)

I don't think the other commands ever worked. I wasn't aware they existed nor what their use is (can't find them in man). I can check them out tonight.

Those two commands never worked indeed. I did not mean to imply it was a regression of this PR. :)
Just wanted to point that out so we know there is room for improvement in a future PR on this package.

]$ nix-env -iA nixos.hwinfo
[demo@nixos:~/testbuilds]$ hwinfo --version
21.23
]$ mk_isdnhwdb
Cannot open /usr/share/hwinfo/ISDN.CDB.txt as stdin
]$ convert_hd
Can't locate XML/Writer.pm in @inc (you may need to install the XML::Writer module) (@inc contains: /home/demo/.nix-profile/lib/perl5/site_perl /nix/var/nix/profiles/default/lib/perl5/site_perl /run/current-system/sw/lib/perl5/site_perl/5.22.2/x86_64-linux-thread-multi /run/current-system/sw/lib/perl5/site_perl/5.22.2 /run/current-system/sw/lib/perl5/site_perl /nix/store/p7k810475bbk0v9wi418sz8jh3dzlpiz-perl-5.22.2/lib/perl5/site_perl/5.22.2/x86_64-linux-thread-multi /nix/store/p7k810475bbk0v9wi418sz8jh3dzlpiz-perl-5.22.2/lib/perl5/site_perl/5.22.2 /nix/store/p7k810475bbk0v9wi418sz8jh3dzlpiz-perl-5.22.2/lib/perl5/5.22.2/x86_64-linux-thread-multi /nix/store/p7k810475bbk0v9wi418sz8jh3dzlpiz-perl-5.22.2/lib/perl5/5.22.2 .) at /home/demo/.nix-profile/bin/convert_hd line 4.
BEGIN failed--compilation aborted at /home/demo/.nix-profile/bin/convert_hd line 4.

Thanks! Pushed to master (d12030d) and release-17.03 (d60e77f).