cpanm-install

#!/bin/bash

# Setup home directory based perl environment and cpanm

set -e

existing_cpanm=$(type -p cpanm || true)
if [[ $existing_cpanm ]] ; then

    if [[ $1 != "--force" ]] ; then
        echo "Found existing cpanm ($existing_cpanm) - use --force if you are sure" >&2
        exit 1
    fi
fi

if [[ ! $HOME =~ ^/ ]] ; then
    echo "Please specify a home starting with a /" >&2
    exit 1
fi

dst=$HOME/perl5
lib=$dst/lib/perl5
bin=$dst/bin
local_lib=$HOME/perldev/lib
local_bin=$HOME/perldev/bin
bashrc=$HOME/.bashrc
bashrc_d=$HOME/.bashrc.d

cpan_dir=$HOME/.cpan
cpanm_dir=$HOME/.cpanm

tmp=$(mktemp -d)
cd $tmp

echo
echo "Using temp dir: $tmp"
echo

echo "downloading cpanm..."

wget --no-check-certificate -q http://xrl.us/cpanm
 
if [[ -d $cpan_dir ]] ; then
    echo "Backing up old $cpan_dir to $tmp/..."
    mv $cpan_dir $tmp/
fi

if [[ -d $cpanm_dir ]] ; then
    echo "Backing up old $cpanm_dir to $tmp/..."
    mv $cpanm_dir $tmp/
fi

chmod +x cpanm
mkdir -p $bin
mv cpanm $bin/

mkdir -p $local_lib $local_bin

echo "updating $bashrc..."

add_msg="# added by cpanm-install"

echo "export PERL5LIB=$local_lib:$lib $add_msg" > bashrc
echo "export PATH=\$PATH:$local_bin:$bin $add_msg" >> bashrc
echo "alias cpanm='cpanm -nq --local-lib $dst' $add_msg" >> bashrc
echo 'alias cpan="(echo use cpanm ; exit 1)" '"$add_msg" >> bashrc

if [[ -d $bashrc_d ]] ; then
    echo '### AUTOMATICALLY GENERATED FILE - DONT EDIT! '"$add_msg" >> bashrc
    echo "adding $bashrc_d/perl..."
    cp bashrc $bashrc_d/0_perl
else

    if [[ ! -e "$bashrc" ]] ; then
        echo "$bashrc does not exist - creating new one..."
        touch $bashrc
    fi

    (cat $bashrc ; echo) | grep -v "$add_msg" >> bashrc
    cp bashrc $bashrc
fi

echo
echo "Perl environment setup complete - please review the changes."
echo
echo "Use 'cpanm ModuleName' to install modules from cpan."
echo "Cpan modules will be installed to your local directory: $dst."
echo
echo "Save your own modules to $local_lib."
echo "Save your own executables to $local_bin."
echo
echo "To run perl script as crons add these lines to your crontab:"
echo "SHELL=/bin/bash"
echo "BASH_ENV=$bashrc"
echo
echo "Please logout and back in for the changes to take effect."
echo