ruby latest setup for centos 7.x

install-latest-ruby-on-centos-7.sh

#!/usr/bin/env bash
set -ex
toolset=devtoolset-7

yum install -y epel-release # EPEL repo
yum install -y centos-release-scl # shiny-new(er) compliers
# make sure there are no surprises installing from repos
grep -r gpgkey= /etc/yum.repos.d/ | cut -d= -f2 | xargs -L1 rpm --import
yum update -y # system update
# misc dev tools, but we're not going to use the ancient toolchain
yum groupinstall -y 'Development Tools'
yum install -y \
  ${toolset}-toolchain bison-devel libtool git wget \
  libxslt-devel libyaml-devel libxml2-devel gdbm-devel libffi-devel \
  zlib-devel openssl-devel libyaml-devel readline-devel curl-devel \
  openssl-devel pcre-devel memcached-devel ${toolset}-valgrind-devel \
  ${toolset}-systemtap-sdt-devel ${toolset}-gcc-gdb-plugin \
  mariadb-devel postgresql-devel sqlite-devel hiredis-devel \
  ImageMagick-devel libidn-devel \

latest_ruby_version() {
  git ls-remote --tags https://github.com/ruby/ruby |
    sed 's!.*/v!!;/[0-9]/!d;s/_/./g;/\//d;/\..*.\..*\./d' |
    sort -V |
    tail -1
}

find_sha256sum() {
  wget -O- https://www.ruby-lang.org/en/feeds/news.rss |
    grep -A10 $1 |
    grep SHA256 |
    grep -Eo '[0-9a-f]{64}'
}
version=$(latest_ruby_version)
major_version=${version%*.*}
tarball=ruby-${version}.tar.xz

cd /usr/local/src
wget https://cache.ruby-lang.org/pub/ruby/${major_version}/$tarball -O $tarball

if [[ ! sha256sum $tarball =~ ^$(find_sha256sum $tarball) ]]; then
  echo 'ERROR: hash mismatch on downloaded Ruby source tarball. Try again.' >&2
  false
fi
tar xf $tarball
rm -f $tarball
scl enable ${toolset} "$SHELL" <<NEXT_STAGE_SCRIPT
CFLAGS+=" -O2 -g -grecord-gcc-switches -fstack-protector-strong"
CFLAGS+=" -fstack-clash-protection -D_FORITIFY_SOURCE=2"
CFLAGS+=" -Wl,-z,relro -Wl,-z,now -Wl,-z,defs	-pipe"; export CFLAGS
cd ruby-$version
./configure \
  --without-X11 \
  --without-tk \
  --enable-shared \
  --disable-install-doc \

make -j4 install # -j OOM's on tiny boxes
cd ..
rm -rf ruby-$version

/usr/local/bin/gem update --system
[ -e ~/.gemrc ] || echo 'gem: --no-document' > ~/.gemrc
[ -e ~/.pryrc ] || echo "require 'spirit_hands'" > ~/.pryrc
/usr/local/bin/gem install \
  rake \
  bundler \
  bundler-audit \
  rubocop \
  specific_install \
  nokogiri \
  ox \
  oj \
  syck \
  multi_json \
  multi_xml \
  msgpack \
  grpc \
  grpc-tools \
  google-protobuf \
  net-http-persistent \
  net-http-pipeline \
  net-ssh \
  net-scp \
  faraday \
  faraday-cookie_jar \
  faraday-middleware \
  sass \
  haml \
  hamlit \
  mustache \
  execjs \
  puma \
  concurrent-ruby \
  concurrent-ruby-ext \
  ruby-progressbar \
  parallel \
  absolute_time \
  ruby-shadow \
  netrc \
  pg \
  mysql2 \
  sqlite3 \
  redis \
  hiredis \
  safe_yaml \
  rspec \
  minitest \
  chef \
  license_finder \
  yard \
  ronn \
  gem-man \
  gem-homepage \
  foreman_god \
  rbtrace \
  uniform_notifier \
  ruby-prof \
  ruby-prof-flamegraph \
  spirit_hands \

/usr/local/bin/ruby -e 'puts "It works!"'
NEXT_STAGE_SCRIPT