How to define a uniq ruby version on Mac OS High-Sierra?

Question

(apologizes: not a native english)

I upgraded my MacBook Air a few days ago to OS High-sierra and I encounter a lot of problems with my ruby versions.

In particular:

Terminal works with a 2.4 ruby version I can't find anywhere…
Apache server seems to work with a 2.3.3 ruby version I find… outside of the rbenv folder…
My rbenv knows only 2.3.0 and 2.3.1 ruby versions…
I'm not be able to install 2.4 version with rbenv (see below)…
rbenv global 2.3.1 doesn't help at all (nothing changes)…

What could I try to use only the 2.3.1 ruby version?………

Some (maybe) helpfull information:

I don't have a ~/.rvm folder.

Some feedbacks about config, in Terminal:

$> ruby -v
   # => ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-darwin17]

$> rbenv versions
   # => 
   * system (set by /Users/philippeperret/.rbenv/version)
   2.3.0
   2.3.1

$> which -a ruby
   # => 
     /Users/philippeperret/.rbenv/shims/ruby
     /usr/local/bin/ruby
     /usr/bin/ruby

$> irb
irb> RUBY_VERSION
     # => "2.4.2"

About homebrew

$> brew config
HOMEBREW_VERSION: 1.4.1
ORIGIN: https://github.com/Homebrew/brew
...
HOMEBREW_PREFIX: /usr/local
CPU: quad-core 64-bit haswell
Homebrew Ruby: 2.3.3 => /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby
Clang: 9.0 build 900
Git: 2.14.3 => /Applications/Xcode.app/Contents/Developer/usr/bin/git
Curl: 7.54.0 => /usr/bin/curl
...
Ruby: /Users/philippeperret/.rbenv/shims/ruby => /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby
Java: 1.8.0_45
macOS: 10.13.2-x86_64
Xcode: 9.2
CLT: N/A
X11: 2.7.11 => /opt/X11

I can't figure out why the ruby version 2.3 (.3) is in /System/Library/Frameworks/Ruby.framework/Versions/ rather than in .rbenv folder?… (despite the fact that I know it's a high-sierra installation)

When I run a local (rails-like) web app (in my browser), asking it the ruby version:

$> RUBY_VERSION
# => 2.3.3
$> ruby --version
# => ruby 2.3.3p222 (2016-11-21 revision 56859) [universal.x86_64-darwin17]
$> which -a ruby
# => /usr/bin/ruby

And it can't find some ruby gems (require 'rubygems' doesn't help). I can't install these gems, of course, until I can't choose 2.3.3 version with rbenv in Terminal:

When I run:

$> rbenv global 2.4.2p198

… (which is the Terminal ruby version), it complains:

rbenv: version `2.4.2p198' not installed

When I try:

rbenv install 2.4.2p198

… it complains:

ruby-build: definition not found: 2.4.2p198

See all available versions with `rbenv install --list'.
If the version you need is missing, try upgrading ruby-build:
brew update && brew upgrade ruby-build

(of course I "brew updated" and so on)

I spent the last few days to read documentation and SO's question/answers in vain…

did you run rbenv install --list? as you can see below, the full version is the one that is available on rbenv - try `rbenv install 2.4.2` once you confirm you can see it here: `rbenv install --list|grep 2.4.2 2.4.2` — dstull, Dec 29 '17 at 15:35
Thanks @dstull. Unfortunately, `rbenv install 2.4.2` doesn't work. Same `ruby-build: definition not found: 2.4.2`. And my `grep` finds nothing at all. — Philippe Perret, Dec 29 '17 at 16:05
Thanks @Joe, but I already know that… That solves nothing, unfortunately. ;-) — Philippe Perret, Dec 29 '17 at 16:08
I know you said you did brew update already - is this what you ran? `brew upgrade rbenv ruby-build` . also, what does `which rbenv` show you? — dstull, Dec 29 '17 at 16:42
@dstull `which rbenv` -> `/usr/local/bin/rbenv`. I updated rbenv and ruby-build… Right now, I am upgrading all with `brew upgrade`. Take a while… — Philippe Perret, Dec 29 '17 at 16:48
ok - kinda looks like you had 2 rbenv's installed - one OS level and one homebrew..you could put the one homebrew installed first in your path and it will likely resolve — dstull, Dec 29 '17 at 23:27
@dstull, how can I "put the one homebrew installed first in my path"? Really thanks for your help… — Philippe Perret, Dec 30 '17 at 09:46
well first determine where you installed homebrew - i.e. on my machine, rbenv exists here: `/usr/local/homebrew/bin/brew`, then put this in your path - you can issue this command on the console to do it immediately, then put in .bash_profile for future logins(if using bash): `export PATH=/usr/local/homebrew/bin:$PATH` - then the rbenv you are targeting w/brew should be under the homebrew/bin dir, but you can search like this if you really want to; to see: `find / -name 'rbenv' 2>/dev/null` — dstull, Dec 30 '17 at 18:26
OK, you meant "put in your PATH". Thanks for your effort, @dstull, but this solution will not help… For instance, apache server doesn't load the .bash_profile file. By the way, you can use `locate rbenv` rather than `find`, and `-print` option rather than `2>/dev/null` ;-). A big hug for your help! And Happy New Year to you! — Philippe Perret, Dec 31 '17 at 06:01
Ok. i am not sure what apache has to do with this as we were trying to figure out why the standard rbenv steps for installing ruby were not working for you on a local laptop..no more, no less. Apache setup is a separate issue, but could be resolved as well for a production like setup..but out of scope for the question asked — dstull, Jan 01 '18 at 12:15
@dstull Local laptop with a apache server. And it's the origin of my problem. My local server doesn't find the gems installed. After a lot of investigations, I discovered the multiple and confusionning ruby versions. So the question. — Philippe Perret, Jan 01 '18 at 12:34

Philippe Perret · Accepted Answer · 2018-01-01T12:36:42.187

Without any answer, the only way I found was to remove all ruby versions:

> brew remove --force ruby
> brew uninstall --ignore-dependencies ruby
> brew uninstall --force ruby
> sudo rm -rf /usr/local/lib/ruby
> sudo rm -rf ~/.rbenv
> sudo rm -rf ~/.gem

Now I use 2.3.3 version everywhere.

> ruby -v
# => 2.3.3

In brew config:

Homebrew Ruby: 2.3.3 => /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby
Ruby: /usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby

I can find my gems in /Library/Ruby/Gems/2.3.0/gems:

gem which sass
# => /Library/Ruby/Gems/2.3.0/gems/sass-3.5.4/lib/sass.rb

To install a new gem, super user privileges are required:

sudo gem install <gem name>

Thanks for help. Maybe It helps.

How to define a uniq ruby version on Mac OS High-Sierra?

1 Answers1