reinstall every gem for each ruby version? - ruby

I just installed Ruby 2.0.0 using rbenv and set it to the global ruby version for my system. Since 2.0 is compatible with 1.9.3, I tried to start up a Rails project with it, but got the following error. I did rbenv rehash after installing 2.0
The `rails' command exists in these Ruby versions:
1.9.3-p327
Does this mean that every gem I installed on my system with 1.9.3 has to be reinstalled if I wish to use it with 2.0?

As seen here:
You need to reinstall bundler for each version of Ruby you use. See Ruby versions where you have it installed:
rbenv whence bundle
See your current version:
rbenv version
Install bundler for that version, if missing:
gem install bundler

Yes. Rbenv (and RVM) have separate "gem home" directories for each installed version of Ruby. There may be ways to symlink certain directories to get them to share, but this will likely lead to problems, particularly with gems that include native C extensions, which may or may not compile and run cleanly in multiple versions.
If you have a Gemfile, easiest thing is to just bundle install again for Ruby 2.0, giving you duplicate copies of many gems and Ruby-2.0 compiled versions of any native gems.

Another solution to this is to copy (or reinstall) the gems from your previous version to the newly installed version. How to do that is answered in detail in this question, which has two scripts -- one to install from local cache, one to reinstall from the internet (mine).

Related

Bundler version for Ruby 2.3.8?

I currently have 2 ruby versions, 2.5.5 and 2.3.8, I am managing them with rbenv, and for gems, I use bundler to manage my specific gem versions. I have an issue when I want to switch to a project that uses 2.3.8 or a version that has to do with Ruby version 2.3.
My question is how do I get bundler to run the command to bundle install interact with my 2.3 projects.
My current version of bundler is 2.0.2.
I have already tried installing a lower version of bundler of which the bundler website claims to interact with ruby version 2.3.
I thought that if I specified the command to run bundle _version_ install it would work, but it still gave me the response that it needed ruby version 2.5 for bundler to work.
Lots of help appreciated.
In some situations, isolation can help. I would like to recommend rvm (https://github.com/rvm/rvm) for managing ruby versions. This tool is very similar to rbenv but in comparison, it allows you to create gemsets which are kind of containers of gems for special purposes. For instance:
rvm install 2.5.5 --disable-binary
rvm use 2.5.5#name-of-gemset --create
gem install bundler
bundle install # inside your project folder with Gemfile
I think that you will not have problems with versions again.

Bundle not working with rbenv and cannot gem install bundler

I was running into an issue with bundler when using rbenv. I had switched from ruby 2.3.1 to 2.5.1 a while ago, but I noticed the following error when trying to run bundler inside of a shell script in an ansible task.
```
rbenv: bundle: command not found
The `bundle' command exists in these Ruby versions:
2.2.2
2.3.1
```
I saw some solutions to this where you had to install bundler when on a specific ruby version. However even uninstalling bundler and reinstalling it did not resolve the issue. It seemed due to some gem issue that I could not install bundler on specific ruby versions, thus reinstalling bundler did nothing for me.
However I did find a very manual solution to this.
I noticed how rbenv whence bundle specified that bundle was active in some ruby versions, but not others. I tracked down the portion of rbenv whence command to find out where it was looking and saw that it looked under the following path for each ruby version installed under rbenv: ~/.rbenv/versions/$VERSION/bin/
If you look under the path for the gem without bundler (for me this was ~/.rbenv/versions/2.5.1/bin/) you will notice that it is not there. However under other versions that whence can recognise you will see the executable is there (for me it was there under ~/.rbenv/versions/2.3.1/bin/bundle and ~/.rbenv/versions/2.3.1/bin/bundle).
So I copied the executable over from the working ruby version to the one that was broken. Then at the top of the file you will notice sha-bang is set to the other ruby version (for me this was #!/Users/myuser/.rbenv/versions/2.3.1/bin/ruby). Change the version path to the ruby version you want to fix and then it will all magically start working.
I would highly recommend that you run your ansible scripts in an environment without rbenv. In other words, it is preferable to be using vagrant or a VM to practice your scripts in.
If your project really needs rbenv, please use the ansible rbenv library to work with it, but running it on your host machine is a dangerous way to develop because it is not easily reversible.
Hope this helps!

How do I find which versions of ruby, gem and bundler are compatible?

I am using puppet to install ruby 1.9.3 as the system ruby on an Ubuntu Trusty Vagrant container. I also install Bundler. I am told that "gem" is installed as part of the installation of ruby.
How do I know which versions of gem go with this version of ruby?
How do I know which versions of bundler go with this version of ruby?
Here is a fragment of puppet code:
$other_reqs = [
...
'ruby1.9.3',
'ruby-bundler',
'rubygems-integration',
...
]
package{ $other_reqs: ensure => 'installed'} -> Package['percona-toolkit']
The package declaration will default to using apt-get to download packages. Clearly the line with 'ruby1.9.3' will get the 1.9.3 version of ruby. It also installed gem 1.8.23. Is this a compatible version of gem? How do I know?
The line with 'ruby-bundler' installed Bundler version 1.3.5. Is this a compatible version of Bundler? Or should I indicate a specific version in my requirements array? Where ought I look to find this information?
It might be helpful if you indicate the problem, or what you're trying to do. Nevertheless:
gem is a command that is built-in in ruby from 1.9+, so whatever comes installed with Ruby should be fine.
bunlder is a RubyGem, normally installed by doing gem install bundler. You can specify the version by doing gem install -v <version>. Either it gets installed correctly or you get an error. Can you install bundler doing that?
And lastly, unless you need it for a specific reason, 1.9 is very old :)

rubygems automatically updating on install

I am currently managing an installation of ruby 1.9.3 in red hat 5.
I have found that, during a specific gem install, ruby is trying to download and install the latest version of a particular required gem.
I have attempted to prevent the updating of gems using the --conservative flag, however, this does not seem to work.
The gem in question requires a specific version of launchy which, in turn, requires a specific version of addressable.
The versions of these gems that are already installed meet the requirements of the gem I am attempting to install. However, the gem command attempts to download and install the latest version of addressable.
This is a problem, because the latest addressable requires public_suffix, which only installs in ruby 2.x and greater.
The gem that I am trying to install is a custom gem, and thus I have modified the gemspec, and found that removing the launchy requirement fixes the issue. However, launchy is a required gem, so the requirement needs to stay in the dependency list.
Has anyone had any experience with dealing with this particular version of ruby and gem and found issues with dependencies?
I have tried going in and modifying gemspec for launchy and addressable in the installed gems dirs, but have found that the issue is with the gem install command attempting to update/install the latest gems despite giving it flags telling it otherwise.
ruby 1.9.3
gem 1.8.23
After some additional research prompted by the above responses, it was determined that an outdated version of Hoe was causing the generated gem to try and install the latest dependencies. After moving away from Hoe to manage dependencies and versions, my issue has been solved.
Some of the dependency management classes seem to behave quite differently, so that's probably the first place to look.
Use the -v flag to specify the exact version to install:
gem install your-custom-gem -v 1.1

How do I run boxen in Mavericks with rbenv installed?

I recently upgraded to Mac OS 10.9 and now I get this message when I run boxen:
Bundler is not compatible with Ruby 2.0 or Rubygems 2.0. Please
upgrade to Bundler 1.3 or higher. Can't bootstrap, dependencies are
outdated
I imagined that I could just set boxen's .ruby-version file to something like 1.8.7, but based on the message above, it still seems to be using Ruby 2.0.
How can I run boxen in Mavericks?
I ran into the exact same issue. The answer is actually deceptively simple. Since Mavericks now includes Ruby 2.0.0p247 and Rubygems 2.0.3, and you apparently upgraded, your system ruby will not find your bundler or ansi gems. So what you need to do is install both with your system ruby, as root.
sudo /usr/bin/gem install bundler
sudo /usr/bin/gem install ansi
Then just restart or terminal. You can now run boxen as you would normally. Also, in order not to keep old files lying around, you may want to cleanup /Library/Ruby/Gems/1.8/ because it will include your old installation of both bundler and ansi on a ruby and gem installation you no longer have.
Seems the problem is with bundler. Just try to update it.
gem install bundler
system ruby (now 2.0) needed an updated version of bundler. Currently, only a pre-release version is compatible with Mac OS 10.9. If gem install bundler complains that you need a newer version of Bundler, as above, try gem install bundler --pre. Also, you may need elevated privileges to install gems for your system's ruby.
I am still confused about why Boxen wants to use system ruby's bundler gem when a different ruby installation is defined by Boxen's rbenv config, but the problem has a working solution now.

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