A Bash script to install Ruby 2.4 on the Raspberry Pi (Raspbian)

install_ruby_rpi.sh

#!/bin/bash

# --------------------------------------------------------------------------------------------
# Installs Ruby 2.4 using rbenv/ruby-build on the Raspberry Pi (Raspbian)
#
# Run from the web:
#   bash <(curl -s https://gist.githubusercontent.com/blacktm/8302741/raw/install_ruby_rpi.sh)
# --------------------------------------------------------------------------------------------

# Welcome message
echo -e "
This will install Ruby 2.4 using rbenv/ruby-build.

It will take about 2 hours to compile on the original Raspberry Pi,
35 minutes on the second generation, and 16 minutes on the third.\n"

# Prompt to continue
read -p "  Continue? (y/n) " ans
if [[ $ans != "y" ]]; then
  echo -e "\nQuitting...\n"
  exit
fi
echo

# Time the install process
START_TIME=$SECONDS

# Check out rbenv into ~/.rbenv
git clone https://github.com/rbenv/rbenv.git ~/.rbenv

# Add ~/.rbenv/bin to $PATH, enable shims and autocompletion
read -d '' String <<"EOF"
# rbenv
export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"
EOF

# Save to ~/.bashrc
echo -e "\n${String}" >> ~/.bashrc

# Enable rbenv for current shell
eval "${String}"

# Install ruby-build as an rbenv plugin, adds `rbenv install` command
git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build

# Install dependencies
#  See: https://github.com/rbenv/ruby-build/wiki#suggested-build-environment
sudo apt update
sudo apt install -y autoconf bison build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm3 libgdbm-dev

# Install Ruby 2.4, don't generate RDoc to save lots of time
CONFIGURE_OPTS="--disable-install-doc --enable-shared" rbenv install 2.4.1 --verbose

# Set Ruby 2.4 as the global default
rbenv global 2.4.1

# Don't install docs for gems (saves lots of time)
echo "gem: --no-document" > ~/.gemrc

# Reminder to reload the shell
echo -e "\nReload the current shell to get access to rbenv using:"
echo "  source ~/.bashrc"

# Print the time elapsed
ELAPSED_TIME=$(($SECONDS - $START_TIME))
echo -e "\nFinished in $(($ELAPSED_TIME/60/60)) hr, $(($ELAPSED_TIME/60%60)) min, and $(($ELAPSED_TIME%60)) sec\n"

👍

Thanks for this. Wish I'd seen it earlier as I was having a problem installing. I think my install is taking more than two hours. But can watch the log to make sure it's still progressing.

Pi 2, 22 min 14 sec

I've tried this multiple times, and it gets quite far in. However, at the "Parsing sources", stage, CPU usage goes through the roof, and the RPi eventually just reboots itself, and the installation doesn't finish.

Last few lines of log:

3% [33/967]  ChangeLog
  3% [34/967]  NEWS
  3% [35/967]  README.EXT
  3% [36/967]  README.EXT.ja
  3% [37/967]  addr2line.c
  3% [38/967]  array.c
  4% [39/967]  bignum.c
  4% [40/967]  class.c
  4% [41/967]  compar.c
  4% [42/967]  compile.c
  4% [43/967]  complex.c
  4% [44/967]  cont.c
  4% [45/967]  debug.c
  4% [46/967]  dir.c
  4% [47/967]  dln.c
  4% [48/967]  dln_find.c
  5% [49/967]  dmydln.c
  5% [50/967]  dmyenc.c
  5% [51/967]  dmyext.c
  5% [52/967]  doc/ChangeLog-1.8.0
  5% [53/967]  doc/ChangeLog-1.9.3
  5% [54/967]  doc/ChangeLog-2.0.0

Any ideas? I've tried three times now, and it always stops at the exact same point.

--disable-install-doc This seems to be a good trick... I'm at 306 minutes so far. Yesterday's attempt with a really bad SD card was at 580+ minutes before I went to bed and it failed sometime overnight... A good SD card is key too it seems - using my GoPro's class 10 now.

I think I am going to be getting into the habit of doing this now so ruby doesn't build docs if it doesn't need to - sstephenson/rbenv-vars#18 (comment)

👍

👍 1 hr, 55 min, 29 seconds. Thanks for the gist, worked like a dream

Why to take all that work when you can simply do:

  cd /usr/src/
  wget http://cache.ruby-lang.org/pub/ruby/2.2/ruby-2.2.2.tar.gz
  tar -xvzf ruby-2.2.2.tar.gz
  cd ruby-2.2.2
  ./configure --enable-shared --disable-install-doc --disable-install-rdoc --disable-install-capi
  make install

Reference: https://github.com/facastagnini/raspberry-bitcoin/blob/master/bootstrap.sh

@blacktm you should really add "--enable-shared" to the configure opts.
@facastagnini what you posted doesn't install of the dependencies not rbenv

👍

thanks for this!

This is excellent, thank you. It took about 35 minutes on my rPi 2.

It didn't load rbenv for the current shell, but re-launching terminal fixed that right up.

16 minutes on RPI 3

Thanks! Just got done running on my second pi, 19min 9sec on this one, 33min on the other, this was very smooth.

Great script, thanks. One suggestion: make sure git is installed before running git commands.
sudo apt-get update && sudo apt-get install -y git-core

Other than that it worked great on my Rpi 3
Finished in 0 hr, 15 min, and 56 sec

Worked great for getting Ruby running on my Pi3

But ...

I had to come here to get rails working:

http://railsapps.github.io/installrubyonrails-ubuntu.html

"Oh no! Something has gone wrong."

My Output:

pi@raspberrypi:~ $ uname -a
Linux raspberrypi 4.4.32-v7+ #924 SMP Tue Nov 15 18:11:28 GMT 2016 armv7l GNU/Linux

pi@raspberrypi:~ $ sudo sh install_ruby_rpi.sh
Building dependency tree
Reading state information... Done
All packages are up to date.
Reading package lists... Done
Building dependency tree
Reading state information... Done
.....
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
install_ruby_rpi.sh: 53: install_ruby_rpi.sh: rbenv: not found
install_ruby_rpi.sh: 56: install_ruby_rpi.sh: rbenv: not found
-e
Reload the current shell to get access to rbenv using:
source ~/.bashrc
install_ruby_rpi.sh: 66: install_ruby_rpi.sh: arithmetic expression: expecting primary: " - "

Note:

pi@raspberrypi: sudo apt-get install ruby-full

pi@raspberrypi:~ $ ruby -v
ruby 2.1.5p273 (2014-11-13) [arm-linux-gnueabihf]
🤘
Source: Openshift

@robertthcan: It's too late, but I ran into the same problem (after trying to install ruby and upgrading it to 2.4, and borking my system)

sudo apt-get install rbenv curl

I added curl just in case. The error output showed that the script could not find rbenv. I assumed it wasn't installed for some reason, so I did it.

Then Re run the script.

took 44 minutes on a RPi 3B but helped a lot!! thanks