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inc/Module/AutoInstall.pm  view on Meta::CPAN

    return 1 if -w $path;

    print << ".";
*** You are not allowed to write to the directory '$path';
    the installation may fail due to insufficient permissions.
.

    if (
        eval '$>' and lc(`sudo -V`) =~ /version/ and _prompt(
            qq(
==> Should we try to re-execute the autoinstall process with 'sudo'?),
            ((-t STDIN) ? 'y' : 'n')
        ) =~ /^[Yy]/
      )
    {

        # try to bootstrap ourselves from sudo
        print << ".";
*** Trying to re-execute the autoinstall process with 'sudo'...
.
        my $missing = join( ',', @Missing );
        my $config = join( ',',
            UNIVERSAL::isa( $Config, 'HASH' ) ? %{$Config} : @{$Config} )
          if $Config;

        return
          unless system( 'sudo', $^X, $0, "--config=$config",
            "--installdeps=$missing" );

        print << ".";
*** The 'sudo' command exited with error!  Resuming...
.
    }

    return _prompt(
        qq(
==> Should we try to install the required module(s) anyway?), 'n'
    ) =~ /^[Yy]/;
}

# load a module and return the version it reports
sub _load {
    my $mod  = pop; # method/function doesn't matter
    my $file = $mod;
    $file =~ s|::|/|g;
    $file .= '.pm';
    local $@;
    return eval { require $file; $mod->VERSION } || ( $@ ? undef: 0 );
}

# report version without loading a module
sub _version_of {
    my $mod = pop; # method/function doesn't matter
    my $file = $mod;
    $file =~ s|::|/|g;
    $file .= '.pm';
    foreach my $dir ( @INC ) {
        next if ref $dir;
        my $path = File::Spec->catfile($dir, $file);
        next unless -e $path;
        require ExtUtils::MM_Unix;
        return ExtUtils::MM_Unix->parse_version($path);
    }
    return undef;
}

# Load CPAN.pm and it's configuration
sub _load_cpan {
    return if $CPAN::VERSION and $CPAN::Config and not @_;
    require CPAN;

    # CPAN-1.82+ adds CPAN::Config::AUTOLOAD to redirect to
    #    CPAN::HandleConfig->load. CPAN reports that the redirection
    #    is deprecated in a warning printed at the user.

    # CPAN-1.81 expects CPAN::HandleConfig->load, does not have
    #   $CPAN::HandleConfig::VERSION but cannot handle
    #   CPAN::Config->load

    # Which "versions expect CPAN::Config->load?

    if ( $CPAN::HandleConfig::VERSION
        || CPAN::HandleConfig->can('load')
    ) {
        # Newer versions of CPAN have a HandleConfig module
        CPAN::HandleConfig->load;
    } else {
    	# Older versions had the load method in Config directly
        CPAN::Config->load;
    }
}

# compare two versions, either use Sort::Versions or plain comparison
# return values same as <=>
sub _version_cmp {
    my ( $cur, $min ) = @_;
    return -1 unless defined $cur;  # if 0 keep comparing
    return 1 unless $min;

    $cur =~ s/\s+$//;

    # check for version numbers that are not in decimal format
    if ( ref($cur) or ref($min) or $cur =~ /v|\..*\./ or $min =~ /v|\..*\./ ) {
        if ( ( $version::VERSION or defined( _load('version') )) and
             version->can('new') 
            ) {

            # use version.pm if it is installed.
            return version->new($cur) <=> version->new($min);
        }
        elsif ( $Sort::Versions::VERSION or defined( _load('Sort::Versions') ) )
        {

            # use Sort::Versions as the sorting algorithm for a.b.c versions
            return Sort::Versions::versioncmp( $cur, $min );
        }

        warn "Cannot reliably compare non-decimal formatted versions.\n"
          . "Please install version.pm or Sort::Versions.\n";
    }

    # plain comparison