Bug#1098916: libchart-perl: limit of number of colors too low

[Bill Allombert]

On Tue, Feb 25, 2025 at 11:17:37PM +0100, Bill Allombert wrote:
> Package: libchart-perl
> Version: 2.403.9-1
> Severity: normal
> 
> Hello Debian Perl Group,
> 
> Upgrading popcon.debian.org to bookworm breaks the graphics due to an issue in
> libchart-perl. I join a very simple test.
> 
> % perl test.pl 50
> 
> //OK
> 
> % perl test.pl 75
> Use of uninitialized value in hash element at /usr/share/perl5/Chart/Base.pm line 1144.
> Use of uninitialized value $arg in index at /usr/share/perl5/Graphics/Toolkit/Color.pm line 63.
> Use of uninitialized value $arg in substr at /usr/share/perl5/Graphics/Toolkit/Color.pm line 64.
> Use of uninitialized value $name in transliteration (tr///) at /usr/share/perl5/Graphics/Toolkit/Color/Constant.pm line 839.
> Use of uninitialized value $name in lc at /usr/share/perl5/Graphics/Toolkit/Color/Constant.pm line 840.
> Use of uninitialized value $arg in concatenation (.) or string at /usr/share/perl5/Graphics/Toolkit/Color.pm line 82.
> '' is an unknown color name, please check Graphics::Toolkit::Color::Constant::all_names(). at /usr/share/perl5/Chart/Base.pm line 1165.
> Unrecognized color for dataset73
>  at test.pl line 10.
> 
> with bullseye, it works for at least 374.

Apparently, in Chart/Base.pm line 939
colors_default_spec was changed to include much less default colors compared to 2.4.10.
At the very least, Chart/Base.pm should include some error checking.

In any case, I have found a work-around for popcon.debian.org.

Cheers,
-- 
Bill. <ballombe at debian.org>

Imagine a large red swirl here.