Re: how to specify "useithreads" in a distroprefs

Hello Slaven,

On 14/06/2022 18:37, Slaven Rezic wrote:
>
> Hi Alceu,
>
> Kwalify is just a schema for validating data structures and it does 
> not do any parsing or matching using the distroprefs data. The latter 
> is done by CPAN::Distroprefs.
>
> That said, I tried "useithreads: undef" and it did not work. So it 
> looks like the matching is not done against what is displayed in "perl 
> -V" (in this case the string "undef"), but what is in the Config data 
> structure (the value undef).
>
> However, the distroprefs code only does regexp matches against the 
> stringified values, so to match the stringified undef (the empty 
> string) one has to use '^$'. Below is a distroprefs file just for 
> demonstration purposes, and it works on my system.
>
Thank you for that!

Just tried with the regex "^$" on OpenBSD 7.1 and worked without the 
warning.

On the other hand, I tried both methods on my Ubuntu box and both worked 
without any warning, which isn't the expected:

me:~/.cpan/prefs$ cat test.yml
---
disabled: 1
match:
   distribution: ^MIK/CryptX
   perlconfig:
     #useithreads: null
     useithreads: '^$'

me:~/.cpan/prefs$ cpan -t CryptX
CPAN: CPAN::SQLite loaded ok (v0.219)
Database was generated on Wed, 15 Jun 2022 03:16:47 GMT
Running test for module 'CryptX'
CPAN: YAML::XS loaded ok (v0.83)
CPAN: CPAN::Kwalify loaded ok (v5.50)

______________________ D i s t r o P r e f s ______________________
test.yml[0]
   MIK/CryptX-0.076.tar.gz
   [disabled] -- NA Disabled via prefs file 
'/home/semantix/.cpan/prefs/test.yml' doc 0
me:~/.cpan/prefs$ vi test.yml

me:~/.cpan/prefs$ cat test.yml
---
disabled: 1
match:
   distribution: ^MIK/CryptX
   perlconfig:
     useithreads: null
     #useithreads: '^$'

me:~/.cpan/prefs$ cpan -t CryptX
CPAN: CPAN::SQLite loaded ok (v0.219)
Database was generated on Wed, 15 Jun 2022 03:16:47 GMT
Running test for module 'CryptX'
CPAN: YAML::XS loaded ok (v0.83)
CPAN: CPAN::Kwalify loaded ok (v5.50)

______________________ D i s t r o P r e f s ______________________
test.yml[0]
   MIK/CryptX-0.076.tar.gz
   [disabled] -- NA Disabled via prefs file 
'/home/semantix/.cpan/prefs/test.yml' doc 0

Now, testing on OpenBSD, I got the warning if using "undef", as previous 
stated.

Comparing the systems, the only thing I got that is different is the 
perl itself:

[goku@cpan-smoker-openbsd:~/cpan-openbsd-smoker]$ mversion CPAN::Kwalify
5.50
[goku@cpan-smoker-openbsd:~/cpan-openbsd-smoker]$ mversion CPAN::Distroprefs
6.0001
[goku@cpan-smoker-openbsd:~/cpan-openbsd-smoker]$ perl -v

This is perl 5, version 32, subversion 1 (v5.32.1) built for i386-openbsd

The Ubuntu box is running:

perl 5, version 34, subversion 0 (v5.34.0) built for x86_64-linux.

Both without ithreads support, but the perl on OpenBSD is patched (by 
the maintainers), so that might explain the difference.

Anyway, I think it's worth to document all this and I'm willing to 
provide a PR for that. Any suggestions where I should do it? Maybe the 
CPAN's distribution Pod?

Regards,

Alceu