Building perl module gives metafile error - perl

I'm working on installing a perl module (not using CPAN) on a Linux machine. When I run the command:
perl Build.PL
I get the following error:
ERROR: Missing required field 'dist_abstract' for metafile
Could not get valid metadata. Error is: Invalid metadata structure.
Errors: Missing mandatory field, 'abstract' (abstract) [Validation: 1.4],
value is an undefined string (abstract) [Validation: 1.4]
at /usr/local/share/perl5/Module/Build/Base.pm line 4559
Could not create MYMETA files
I've tried Googling bits and pieces of this error but haven't found any solutions. Just looking for a clue as to what might be causing this error.
Here's a link to a zip file containing the files required to install it:
https://oncourse.iu.edu/access/content/user/brilewis/Filemanager_Public_Files/DataDownloader.zip

First at all please make sure you have package Module::Build installed.
You need ungzip few gzipped files in this package. I don't realize why author gzipped them:
gzip -d *.gz
I really don't know why author archived each install file. It looks like some mistake to me.
Than you can install all dependencies (this module requires some):
./Build installdeps
And then finally install module itself:
./Build
./Build test
./Build install
However I must warn you that this module packaged in a bit strange way and there's no guarantee it works.

The NAME section of the module does not have a - in it, e.g.,
=head1 NAME
Foo::Bar implements a Foo framework.
will fail, but if you make it
=head1 NAME
Foo::Bar - implements a Foo framework.
then it will work.

Do you have root access on your machine? Can you use the cpan utility to build and install your module. Using cpan is fairly straight forward:
$ cpan
After that, it will do a lot of configuration, simply take the default values. When it finishes, it'll come to a cpan> prompt. All you have to do there is type this:
cpan> install Module::Name
Where Module::Name is the module you're trying to install. Check the CPAN archive to get the name of your module.
If there are any dependencies, CPAN will ask if you want to download and install those. Say Yes, and CPAN will install the dependencies, then your module.
Using cpan is the best way to install third party modules you find in the CPAN archive. It takes care of all the dependencies, testing, and building for you.
Try installing through CPAN, and then see if you still have your issues.

Related

App::FatPacker on Windows

I have a script on Windows which uses multiple pure Perl modules from CPAN.
I am trying to ship this script without the need to reinstall those modules from CPAN using App::FatPacker.
I installed App::FatPacker ( up to date (0.010007) version ) on Portable Strawberry Perl 5.24 .
When I run the following command
fatpack pack myscript.pl > myscript.packed.pl
I get
syntax OK
but the fatlib is empty and when I run my script it fails.
I tried to use this script which does nothing but load Geo::IP::PurePerl
use strict;
use warnings;
use Geo::IP::PurePerl;
and run again this command :
fatpack pack myscript.pl > myscript.packed.pl
Then I ran myscript.packed.pl on another instance of Strawberry Perl 5.24, I get the following error:
Can't locate Geo/IP/PurePerl.pm in #INC (you may need to install the Geo::IP::PurePerl module
I tried to debug it by building step by step
The fatpack trace creates a trace list as expected, including Geo::IP::PurePerl
The fatpack packlists-for finished successfully but the fatlib is empty.
Any idea?
I would say that packlists-for isn't finding any .packlist files
The documentation for fatpack says this
packlists-for
$ fatpack packlists-for Module1 Module2 Module3
Searches your perl's #INC for .packlist files containing the .pm files for the modules requested and emits a list of unique packlist files to STDOUT.
These packlists will, in a pure cpan-installation environment, be all non-core distributions required for those modules.
Unfortunately most vendors strip the .packlist files so if you installed modules via e.g. apt-get you may be missing those modules; installing your dependencies into a local::lib first is the preferred workaround.
I think that's useful advice that may well fix your problem

Perl Par::Packer Can't find module issue

I have a perl program that uses WWW::Mechanize::Firefox on windows 7 32bit with strawberry perl.
It works fine with the command C:\>perl testcase.pl. When I compile it with C:\>pp -o testcase.exe testcase.pl it compiles with no errors.
When I run the testcase.exe it gives me the error:
Failed to connect to , Can't locate object method "setup" via package "MozRepl::Client" at MozRepl.pm line 224
The code I am using for testcase.pl is:
#!perl
use MozRepl;
use WWW::Mechanize::Firefox;
use warnings;
system('start firefox');
sleep(5);
$mech = WWW::Mechanize::Firefox->new;
Also note that a program without WWW::Mechanize::Firefox and MozRepl does work fine.
The problem has obviously been narrowed down to PAR::Packer not liking MozRepl, any idea what it might be?
PAR::Packer sometimes has a hard time identifying which modules need to be included in a PAR package in order to fulfill all of the requirements of the program you are trying to package.
It copes OK if the dependancies are loaded via plain 'use', or 'require' statements where the module to be loaded is a literal string, but it won't have much chance if the module is being loaded dynamically with something like:
require $myModuleToLoad;
Browsing the source code of MozRepl and related modules shows that they make heavy use of plugins loaded dynamically. I suspect that some of these are not being packaged.
You can manually specify module(s) to be included in the PAR package by adding -M Module::Name to the pp command line for each of the modules to be added (replacing Module::Name with the actual module name of course).
The hard part might be identifying which modules to include. One way to do this is to temporarily add something like this to the end of your script:
END { print "$_ -> $INC{$_}\n" foreach sort keys %INC; }
then run your script normally, not through PAR. It should list all the modules that were loaded. You can compare that with the actual modules present in the PAR package and add the missing ones using the -M option to pp.
You can see the modules inside your PAR file by opening it with an unzipping tool, such as 7zip. Or in Linux:
unzip -l {parfile}

Dependency of Image::Imlib2 on CpanTesters

I get a lot of errors on CpanTesters for my module EBook::MOBI::Image
(It is just some additional stuff for EBook::MOBI. Like this I keep graphics-dependencies from the main module away for those who don't need it anyways).
All tests, except those for GNU/Linux fail:
http://www.cpantesters.org/distro/E/EBook-MOBI-Image.html#EBook-MOBI-Image-0.11
Since I only have GNU/Linux and have some lack of experience in general, I ask for some help here.
The test results seem to indicate, that there is a problem with the dependency of Image::Imlib2
http://www.cpantesters.org/cpan/report/2306795e-99db-11e2-8c80-50d7c5c10595
There it says I should take care, that Image::Imlib2 is in the "Makefile.PL", but it is there as you can see:
https://metacpan.org/source/BORISD/EBook-MOBI-Image-0.11/Makefile.PL#L24
Image::Imlib2 itself does not have this issues. Tests pass all the systems:
http://www.cpantesters.org/distro/I/Image-Imlib2.html#Image-Imlib2-2.03
Can somebody give a hint here what is wrong?
The code is hosted here:
https://github.com/borisdaeppen/EBook-MOBI-Image
Thanks a lot.
When I try to install this module (on Cygwin) with the cpan command:
cpan recognizes that I need the Image::Imlib2 module (warning: prerequisite Image::Imlib2 0 not found)
cpan downloads and attempt to build Image::Imlib2
build of Image::Imlib2 fails (you must install the imlib2 library before you can install Image::Imlib2 ... Make has some problems, won't install)
cpan continues to build EBook::MOBI::Image (... Continuing, but chances to succeed are limited)
and of course, the tests for Ebook::MOBI::Image fail
The PREREQ_PM => ... directive in Makefile.PL tell cpan to make an effort to satisfy a prerequisite, but as you see, it will continue the build even if the prerequisite fails to install. The PREREQ_PM directive is good enough for most modules on CPAN, but not for modules that need an external library that cpan can't install on its own.
I think what you want in this case is for the cpan tester to bail out if you can't load the Image::Imlib2 module, and the place to do that is early in Makefile.PL.
if (!eval "require Image::Imlib2") {
print "This distribution requires Image::Imlib2!\n";
exit 0;
}
For systems that can't or won't install Image::Imlib2, bailing out of Makefile.PL will cause the tester to report a result of N/A instead of FAIL.

How can I safely compile a Perl 5.12 module for Perl 5.8.9?

I want to install File::Fetch, which is a core module in Perl 5.12, in my Perl 5.8.9. In general, I want to compile and install future-dated modules in my back-dated Perl because I cannot upgrade my Perl.
So I downloaded the module and also its dependencies. It's quite painful following the dependency tree but I'm more concerned about the fact that some of them are core modules. If I install these, my Perl 5.8.9 core will have patches from 5.12.
My question is how I can know whether I can safely install the future-dated modules, especially the core modules. Is there a tutorial for this purpose of testing backwardcompatability in Perl?
EDIT:
My module is dual lifed, but I cannot compile it using cpan. It said my FTPsite.yaml has a bad element. However, I followed the dependencies in the modules' META files, and I could compiled the module. Is this one of the odd bits with cpan? Thank you.
I cannot recreate the issue after I installed all those dependencies manually. But here is the error:
cpan[5]> install File::Fetch
Running install for module 'File::Fetch'
Running make for B/BI/BINGOS/File-Fetch-0.24.tar.gz
CPAN: Digest::SHA loaded ok (v5.48)
CPAN: Time::HiRes loaded ok (v1.9715)
CPAN: YAML loaded ok (v0.72)
Alert: While trying to 'parse' YAML file
'/Users/martin/.cpan/FTPstats.yml'
with 'YAML' the following error was encountered:
YAML Error: Invalid element in map
Code: YAML_LOAD_ERR_BAD_MAP_ELEMENT
Line: 3
Document: 1
at /opt/local/lib/perl5/site_perl/5.8.9/YAML.pm line 36
If the module is available separately (i.e. "dual-lifed"), as both a standalone distribution and inside core Perl, then the standalone version is safe to install on an earlier Perl, assuming its Makefile allows it. That is, if you can do cpan <Module> and it builds and tests without errors, then you are good.
The only problem is if a module is not dual-lifed, which I opined about in this question -- which is where you are likely S.O.L.
If a perl core module is also available separately, that means that it is intended to work on older perls (unless it explicitly requires some version of perl), and if it doesn't, that's a bug.
That said, 5.10 was released almost three years ago, and you are going to start seeing more and more problems using newer modules with older versions of perl.
cpan or cpanplus will handle dependencies for you.

How do I use a dependency on a Perl module installed in a non-standard location?

I need to install two Perl modules on a web host. Let's call them A::B and X::Y. X::Y depends on A::B (needs A::B to run). Both of them use Module::Install. I have successfully installed A::B into a non-system location using
perl Makefile.PL PREFIX=/non/system/location
make; make test; make install
Now I want to install X::Y, so I try the same thing
perl Makefile.PL PREFIX=/non/system/location
The output is
$ perl Makefile.PL PREFIX=/non/system/location/
Cannot determine perl version info from lib/X/Y.pm
*** Module::AutoInstall version 1.03
*** Checking for Perl dependencies...
[Core Features]
- Test::More ...loaded. (0.94)
- ExtUtils::MakeMaker ...loaded. (6.54 >= 6.11)
- File::ShareDir ...loaded. (1.00)
- A::B ...missing.
==> Auto-install the 1 mandatory module(s) from CPAN? [y]
It can't seem to find A::B in the system, although it is installed, and when it tries to auto-install the module from CPAN, it tries to write it into the system directory (ignoring PREFIX). I have tried using variables like PERL_LIB and LIB on the command line, after PREFIX=..., but nothing I have done seems to work.
I can do make and make install successfully, but I can't do make test because of this problem. Any suggestions?
I found some advice at http://servers.digitaldaze.com/extensions/perl/modules.html to use an environment variable PERL5LIB, but this also doesn't seem to work:
export PERL5LIB=/non/system/location/lib/perl5/
didn't solve the problem.
The answer is local::lib, but you probably already know that :)
OK, the following prescription did it:
perl Makefile.PL --skipdeps --no-manpages PREFIX=/non/system/location INSTALLSITELIB=/non/system/location/lib INSTALLSITEBIN=/non/system/location/bin INSTALLMAN1DIR=/non/system/location/man/man1 INSTALLMAN3DIR=/non/system/location/man/man3
This is just "monkey see monkey do" but now make test works.
The --skipdeps option here suppresses a convenient feature/exasperating problem with Module::Install where it tries to use CPAN.pm to download missing modules.
The --no-manpages is supposed to stop it installing man pages but it doesn't work.
Because this is the top link i thought i'd update with my experience (which has taken a while to get working, hence updating the 7 year old post).
first run perl -le 'print join $/, #INC'
add (note, no / at the end!!)
export PERL5LIB=/nonstddir/scripts/modules/lib/site_perl:/nonstddir/scripts/modules/lib
run perl -le 'print join $/, #INC' make sure the new dirs are added. this makes it work. if you add a / at the end of the path, the INC entry will look weird and wrong. Mine had a // in the middle.
When done and working, mine looks like
/nonstddir/scripts/modules/lib/site_perl/5.8.4/sun4-solaris-64int
/nonstddir/scripts/modules/lib/site_perl/5.8.4
/nonstddir/scripts/modules/lib/site_perl
/nonstddir/scripts/modules/lib/sun4-solaris-64int
/nonstddir/scripts/modules/lib
/usr/perl5/5.8.4/lib/sun4-solaris-64int
/usr/perl5/5.8.4/lib
/usr/perl5/site_perl/5.8.4/sun4-solaris-64int
/usr/perl5/site_perl/5.8.4
/usr/perl5/site_perl
/usr/perl5/vendor_perl/5.8.4/sun4-solaris-64int
/usr/perl5/vendor_perl/5.8.4
/usr/perl5/vendor_perl