How to uninstall all gems installed using `bundle

问题:

How can I remove all the gems installed using bundle install in a particular RoR project. I don't want to uninstall gems that are used by other projects.

回答1:

Since we're using ruby you could do something like this I guess:

bundle list | ruby -e 'ARGF.readlines[1..-1].each {|l| g = l.split(" ");  puts "Removing #{g[1]}"; `gem uninstall --force #{g[1]} -v #{g[2].gsub(/\(|\)/, "")}`; }'

NOTE: Only lightly tested.

回答2:

There's no one simple way to remove all gems - let alone removing those within a specific bundle. You could try some of these suggestions: Uninstall all installed gems, in OSX?

Adapt to the bundle show command instead of gem list

---

For the future, try this approach:

If you install your bundle locally like the example below, the gems won't be installed in your global gem directory. Then you can easily delete the installation folder to delete all gems of the bundle.

# install gems to project_root/vendor/bundle
bundle install --path vendor/bundle --without test

The path option is saved to .bundle/config just like all others and any subsequent bundle install calls will use it unless you set it to something else or remove it from the config!

回答3:

You can use (like Tobias says, if you are using RVM)

rvm gemset empty [gemset]

Directly on the gemset, for example

rvm gemset empty 2.0.0@server

回答4:

If you're using rvm, you could of course just uninstall and reinstall the version of ruby under which you've installed the gems, i.e.

% rvm use
Using /home/ubuntu/.rvm/gems/ruby-2.2.1
% rvm uninstall 2.2.1
ruby-2.2.1 - #removing rubies/ruby-2.2.1..
ruby-2.2.1 - #removing default ruby interpreter.............
% rvm install 2.2.1
Searching for binary rubies, this might take some time.
Found remote file https://rvm_io.global.ssl.fastly.net/binaries/ubuntu/14.0/x86_64/ruby-2.2.1.tar.bz2
Checking requirements for ubuntu.
Requirements installation successful.
ruby-2.2.1 - #configure
ruby-2.2.1 - #download
ruby-2.2.1 - #validate archive
ruby-2.2.1 - #setup 
ruby-2.2.1 - #gemset created /home/ubuntu/.rvm/gems/ruby-2.2.1@global
ruby-2.2.1 - #importing gemset /home/ubuntu/.rvm/gemsets/global.gems..............................
ruby-2.2.1 - #generating global wrappers........
ruby-2.2.1 - #gemset created /home/ubuntu/.rvm/gems/ruby-2.2.1
ruby-2.2.1 - #importing gemsetfile /home/ubuntu/.rvm/gemsets/default.gems evaluated to empty gem list
ruby-2.2.1 - #generating default wrappers........

and now you have a ruby environment clean of any installed gems.

回答5:

It is actually as simple as

gem list --no-versions | xargs gem uninstall -a

If you are not using RVM/RBENV, you might hit into issue when gem attempts to uninstall system library which can fail. In that case, call uninstall command one by one to skip these.

gem list --no-versions | xargs -n1 gem uninstall -a

回答6:

Found solution for uninstalling all gems except of default:

Crete delete_gems.rb with

#!/usr/bin/env ruby
# Remove all gems EXCEPT defaults :)

`gem list -d`.split(/\n\n^(?=\w)/).each do |data|
  match = data.match(/(?<name>([^\s]+)) \((?<versions>.*)\)/)
  name = match[:name]
  versions = match[:versions].split(', ')

  if match = data.match(/^.*\(([\d\.]*),? ?default\): .*$/)
    next if match[1].empty? # it's the only version if this match is empty
    versions.delete(match[1] || versions[0])
  end

  versions.each { |v| system "gem uninstall -Ix #{name} -v #{v}" }
end

Run this script:

sudo chmod 1777 delete_gems.rb
./delete_gems.rb

All gems will be removed except of default. Here link on original solution http://zanshin.net/2013/06/10/how-to-delete-all-ruby-gems/

回答7:

Another way from https://makandracards.com/jan0sch/9537-uninstall-all-ruby-gems-from-your-system (similar to rainkinz's answer and Ralph's comment). Here are some variations:

# if you're the root user:
gem list | cut -d" " -f1 | xargs -I % gem uninstall -aIx %

# if you're a non-root user:
gem list | cut -d" " -f1 | xargs -I % sudo gem uninstall -aIx %

# docker compose (if your service is named "web" running the root user):
docker-compose run web bash -c 'gem list | cut -d" " -f1 | xargs -I % gem uninstall -aIx %'

####

gem install bundler
# or if using docker compose:
docker-compose run web gem install bundler

# optionally reinstall gems:
bundle install
# or if using docker compose:
docker-compose run web bundle install

Breaking this down:

• gem list lists all gems
• cut -d" " -f1 takes the first column
• xargs -I % gem uninstall -aIx % calls gem uninstall -aIx with each output line as an argument

Note that I specified the argument with -I as % and passed it directly for security:

xargs -I % gem uninstall -aIx %

instead of:

xargs gem uninstall -aIx

That's because xargs has a security issue where options like -n can be passed to its command and cause unexpected results. This can be demonstrated with the following example:

# correctly prints "-n hello" (with trailing newline):
echo '-n Hello' | xargs -I % echo % | xargs -I % echo %

# incorrectly prints "hello" (without trailing newline):
echo '-n Hello' | xargs echo