How do I tell CPAN to install all dependencies?

Question

How do I tell CPAN to install all dependencies?

I tried setting these in cpan:

cpan> o conf prerequisites_policy follow
cpan> o co         


        

Answer 1

Maybe it's related to ExtUtils::AutoInstall or Module::AutoInstall being used. Try setting the PERL_AUTOINSTALL environment variable. (Cf. the documentation of those modules.)

Answer 2

I'm writing this for benefit of people who may have come to this page searching for a way to install all module dependencies needed by a particular perl script. I wrote a script for that:

It should be run as ./installdep.pl yourscript.pl

#!/usr/bin/perl
`sudo apt install cpanminus`;
while (<>) {
    if (/USE /i)
    {
        my $line=$_;
        $line=~ s/\s//g;
        $line=~ /^(.*)\./;
        $line=~ s/\;//;
        $line=~s/^USE//i;
        $line=~s/lib.*//i;
        $line=~s/feature.*//i;
        $line=~s/strict//i;
        $line=~s/warnings//i;
        $line =~ s/^(.*)\(.*/$1/;
        unless ($line eq '') {
        my $cmd='sudo cpanm '.$line;
        print "Installing $line \n";
        open my $cmd_fh, "$cmd |";
        while (<$cmd_fh>) {
          print "$_";
        }
        close $cmd_fh;
        print "\n";
    }
    }
}

This will use cpanminus to install all module dependencies required by your script. If cpanm isnt installed, it will install it.

Answer 3

Changing the following parameter on top of prerequisites_policy follows.

cpan> o conf prerequisites_policy 'follow'
cpan> o conf build_requires_install_policy yes
cpan> o conf commit

This will change it from "ask/yes" to "yes" and stop it asking you.

Answer 4

Try setting PERL_MM_USE_DEFAULT like so:

PERL_MM_USE_DEFAULT=1 perl -MCPAN -e 'install My::Module'

It should make CPAN answer the default to all prompts.

Answer 5

I found this to be, by far, the quickest and most reliable way to install CPAN modules:

yes | perl -MCPAN -e "CPAN::Shell->notest(qw!install Your::Module!)"

Answer 6

Set

prerequisites_policy

in the configuration.

See Config Variables.