CentOS 7: Install Ruby 2.3

CentOS 7's ruby version is 2.0. This article will describe installing Ruby 2.3 with using Fedora 25's src.rpm.

1 Install Ruby 2.3 with using Fedora 25's src.rpm

This article uses Fedora 25's src.rpm. If you already have built and installed ruby 2.3 without using src.rpm, you do not have to use this article's way.
Fedora 25's rpm have some new features like load, Suggests and Recommends. You need to change these for CentOS 7's rpm.
This article changes Suggest and Recommends to Requires. Deleting these may be alright.
The load feature will load rpm macro file which are in SOURCES directory. This article will copy rpm macro file to /usr/lib/rpm/macros.d.
This article does not build rubygem-xxx packages. You can build rubygem-xxx with using Fedora 25's src.rpm but you have to check dependencies order. You can use "sudo gem install" instead of rubygem-xxx package.

#!/bin/sh

set -e

FEDORA25=https://dl.fedoraproject.org/pub/fedora/linux/releases/25
FEDORA25_PACKAGES_R=${FEDORA25}/Everything/source/tree/Packages/r

# Fedora 25's ruby version will be changed. ruby and rubypick package
# must be installed together.
RUBY_SRPM="
ruby-2.3.1-58.fc25.src.rpm
rubypick-1.1.1-5.fc24.src.rpm
"

RUBY_RPMS_DIR=$(mktemp -d -t centos-ruby.sh.XXXXXX)
trap 'rm -rf ${RUBY_RPMS_DIR}* 2>/dev/null' 0

rpmbuild_install_srpm()
{
  wget -q "${FEDORA25_PACKAGES_R}/${1}"
  sudo yum-builddep -y "${1}"
  rpm -i "${1}"
  rm -f "${1}"
}

rpmbuild_convert_unknown_tag()
{
  sed -e 's/^Suggests:\(.*\)/Requires:\1/g' \
      -e 's/^Recommends:\(.*\)/Requires:\1/g' \
      -i SPECS/*.spec
}

rpmbuild_load_macro()
{
  local macro macros source sources
  macros=""
  sources=$(grep '^%{?load:%{.*}}' SPECS/*.spec | \
               sed -e 's/^%{?load:%{\(.*\)}}/\1/g')
  for source in ${sources}; do
    macro=$(grep -i "^${source}" SPECS/*.spec | \
               awk -F':' '{ print $2 }' | sed -e 's/ //g')
    [ -f /usr/lib/rpm/macros.d/"${macro}" ] && continue
    macros="${macros} ${macro}"
  done

  for macro in ${macros}; do
    sudo cp SOURCES/"${macro}" /usr/lib/rpm/macros.d/
    printf "%s" "${macro} "
  done
}

rpmbuild_unload_macro()
{
  [ -z "${1}" ] && return
  local macro
  for macro in "$@"; do
    sudo rm -f /usr/lib/rpm/macros.d/"${macro}"
  done
}

rpmbuild_build()
{
  local macros curdir
  curdir=${PWD}
  cd ~/rpmbuild
  rpmbuild_convert_unknown_tag
  macros=$(rpmbuild_load_macro)
  rpmbuild -ba --define 'with_rubypick 1' SPECS/*.spec
  cp -a RPMS/* "${RUBY_RPMS_DIR}"/
  rpmbuild_unload_macro "${macros}"
  cd "${curdir}"
  rm -rf ~/rpmbuild
}

rpmbuild_install()
{
  local pkgs
  pkgs=$(find "${RUBY_RPMS_DIR}"/ -type f)
  # shellcheck disable=SC2086
  sudo yum localinstall -y ${pkgs} && rm -f ${pkgs}
}

ruby_install()
{
  local pkg
  for pkg in "$@"; do
    rpmbuild_install_srpm "${pkg}"
    rpmbuild_build
  done
  rpmbuild_install
}

ruby_main()
{
  # CentOS 7's ruby will cause build error of Fedora 25's ruby.
  sudo yum remove -y ruby
  sudo yum install -y rpmdevtools yum-utils
  # shellcheck disable=SC2086
  ruby_install ${RUBY_SRPM}
}

ruby_main

2 Execution result

Ruby version and "Hello, World" are the following.

$ ruby -v
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-linux]
$ cat <<EOF | ruby
print "Hello, World\n"
EOF
Hello, World

And Ruby's test has been already done when building ruby src.rpm. if test is failed, building Ruby's package will be failed.

CentOS 7: Install Ruby 2.3

Table of Contents

1 Install Ruby 2.3 with using Fedora 25's src.rpm

2 Execution result