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Debian: Install rbenv plus plugins to handle gemsets and gem installation via bundler without needing root access
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rbenv-debian-local.md

Prerequisites

git-core libssl-dev libreadline-dev zlib1g-dev bison build-essential libyaml-dev

rbenv Installation

see also https://github.com/rbenv/rbenv#basic-github-checkout

git clone https://github.com/sstephenson/rbenv.git ~/.rbenv

Add these lines to your ~/.bashrc

export PATH="~/.rbenv/bin:$PATH"
eval "$(rbenv init -)"

Reload your bashrc

. ~/.bashrc

Plugin Installation

git clone https://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build
git clone https://github.com/sstephenson/rbenv-gem-rehash.git ~/.rbenv/plugins/rbenv-gem-rehash
git clone git://github.com/jf/rbenv-gemset.git ~/.rbenv/plugins/rbenv-gemset
git clone -- https://github.com/carsomyr/rbenv-bundler.git ~/.rbenv/plugins/rbenv-bundler
rbenv bundler on

Usage

Install the desired Ruby version

Create a Gemset for your project

Now bundle install won't ask for your (sudo) password anymore.

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