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Local gems

I need to use Ruby in a severely constrained VM where rbenv may NOT be the best option.

This is not the best option permission wise.

sudo apt install ruby-dev
sudo chmod -R 777 /var/lib/gems/3.0.0
sudo chmod -R 777 /usr/local/bin
sudo apt install make
sudo apt install build-essential
gem install rails

environment

https://guides.rubygems.org/command-reference/#gem-environment

gem environment

documentation https://docs.ruby-lang.org/en/3.0/Gem/ConfigFile.html

https://www.jedi.be/blog/2009/04/29/gem_home-and-gem_path-with-passenger/

config

cat ~/.gemrc

gives the correct config

---
gem: --no-rdoc --user-install

installation

touch ~/.gemrc
gem environment
nano ~/.gemrc
sudo apt install build-essential ruby-dev
echo 'export PATH="$PATH:$HOME/.local/share/gem/ruby/3.0.0/bin"' >> ~/.bashrc
source ~/.bashrc

still fails

Using rake 13.0.6
Following files may not be writable, so sudo is needed:
  /usr/local/bin
  /var/lib/gems/3.0.0
Using concurrent-ruby 1.2.2
Using i18n 1.14.1
Fetching minitest 5.18.0


Your user account isn't allowed to install to the system RubyGems.
  You can cancel this installation and run:

      bundle config set --local path 'vendor/bundle'
      bundle install

When I follow the above suggestion the installation completes successfully.

network

$ cat ~/bin/host_network

#!/usr/bin/bash

sudo dhclient enp0s8
echo "connection established"

ip a | grep -A 5 enp0s8

installing rbenv

sudo apt install ruby-dev build-essential
sudo apt install libyaml-dev
sudo apt install libssl-dev libffi-dev libreadline-dev zlib1g-dev

curl -fsSL https://github.com/rbenv/rbenv-installer/raw/HEAD/bin/rbenv-installer | bash

rbenv install --verbose 3.2.2

RAILS_ENV=production bundle install

rm ./config/credentials.yml.enc
RAILS_ENV=production rails credentials:edit
EDITOR="nano" bin/rails credentials:edit
RAILS_ENV=production rails assets:precompile

RAILS_ENV=production rails db:migrate
RAILS_SERVE_STATIC_FILES=true RAILS_ENV=production rails s -b 0.0.0.0 -p 3001