Howto: easily create rpms from ruby gems for use with puppet-agent AIO

puppet-agent-create-gem-rpm

#!/bin/bash

# Author: Thomas Mueller <thomas@chaschperli.ch>
# Date: 2015-06-05

# enable to exit on first error
# set -e

# list gem's to create rpm's seperated by space
# example for 2 gems: gem_list="r10k trocla"

gem_list="r10k"


export PATH="/opt/puppetlabs/bin:/opt/puppetlabs/puppet/bin:$PATH"

# requires the IMHO nice packaging tool fpm 
# (https://github.com/jordansissel/fpm)
# try to install fpm if not found
which fpm >/dev/null || gem install fpm

# install gem's to a temp directory
gem install --no-ri --no-rdoc --install-dir /tmp/gems $gem_list

timestamp=$(date +%Y%m%d%H%M%S)
pkg_path="/tmp/gems/pkg_${timestamp}"

mkdir -p "$pkg_path"
cd "$pkg_path"

# gem v.1.2.0 fpm produces dependency to exact version 1.2 (without .0)
# use gem-disable-dependency to disable this one
find /tmp/gems/cache -name '*.gem' | \
 xargs -rn1 \
   fpm \
     --depends 'puppet-agent >= 1.0.0' \
     --iteration 0.el6 \
     --epoch 0 \
     --gem-package-name-prefix puppet-agent-rubygem \
     --gem-disable-dependency colored \
     -s gem \
     -t rpm

echo "RPM's are in folder: ${pkg_path}"