Unable to install Ruby 3.3

[jish]

When I attempt to install Ruby 3.3

• Using Ruby Build https://github.com/rbenv/ruby-build
• Using Ruby Install https://github.com/postmodern/ruby-install
• Or installing from source https://docs.ruby-lang.org/en/3.3/contributing/building_ruby_md.html

I am left with an error unable to continue the installation:

installing default gems from lib:   /$HOME/.rubies/ruby-3.3.0/lib/ruby/gems/3.3.0
                                        abbrev 0.1.2
                                        base64 0.2.0
                                        benchmark 0.3.0
                                        bundler 2.5.3
    /private/var/folders/g1/lsyk714x5fqgqntbmpsg4wbr0000gq/T/ruby-build.20240412165645.65510.orrVYI/ruby-3.3.0/lib/rubygems/yaml_serializer.rb:71:in `block in load': undefined method `[]=' for nil (NoMethodError)
   	from /private/var/folders/g1/lsyk714x5fqgqntbmpsg4wbr0000gq/T/ruby-build.20240412165645.65510.orrVYI/ruby-3.3.0/lib/rubygems/yaml_serializer.rb:58:in `split'
   	from /private/var/folders/g1/lsyk714x5fqgqntbmpsg4wbr0000gq/T/ruby-build.20240412165645.65510.orrVYI/ruby-3.3.0/lib/rubygems/yaml_serializer.rb:58:in `load'
   	from /private/var/folders/g1/lsyk714x5fqgqntbmpsg4wbr0000gq/T/ruby-build.20240412165645.65510.orrVYI/ruby-3.3.0/lib/rubygems/config_file.rb:533:in `load_with_rubygems_config_hash'
   	from /private/var/folders/g1/lsyk714x5fqgqntbmpsg4wbr0000gq/T/ruby-build.20240412165645.65510.orrVYI/ruby-3.3.0/lib/rubygems/config_file.rb:350:in `load_file'
   	from /private/var/folders/g1/lsyk714x5fqgqntbmpsg4wbr0000gq/T/ruby-build.20240412165645.65510.orrVYI/ruby-3.3.0/lib/rubygems/config_file.rb:191:in `initialize'
   	from /private/var/folders/g1/lsyk714x5fqgqntbmpsg4wbr0000gq/T/ruby-build.20240412165645.65510.orrVYI/ruby-3.3.0/lib/rubygems.rb:325:in `new'
   	from /private/var/folders/g1/lsyk714x5fqgqntbmpsg4wbr0000gq/T/ruby-build.20240412165645.65510.orrVYI/ruby-3.3.0/lib/rubygems.rb:325:in `configuration'
   	from /private/var/folders/g1/lsyk714x5fqgqntbmpsg4wbr0000gq/T/ruby-build.20240412165645.65510.orrVYI/ruby-3.3.0/lib/rubygems/user_interaction.rb:165:in `verbose'
   	from /private/var/folders/g1/lsyk714x5fqgqntbmpsg4wbr0000gq/T/ruby-build.20240412165645.65510.orrVYI/ruby-3.3.0/lib/rubygems/installer.rb:550:in `generate_bin_script'
   	from ./tool/rbinstall.rb:891:in `generate_bin_script'
   	from ./tool/rbinstall.rb:855:in `generate_bin_script'
   	from /private/var/folders/g1/lsyk714x5fqgqntbmpsg4wbr0000gq/T/ruby-build.20240412165645.65510.orrVYI/ruby-3.3.0/lib/rubygems/installer.rb:510:in `block in generate_bin'
   	from /private/var/folders/g1/lsyk714x5fqgqntbmpsg4wbr0000gq/T/ruby-build.20240412165645.65510.orrVYI/ruby-3.3.0/lib/rubygems/installer.rb:495:in `each'
   	from /private/var/folders/g1/lsyk714x5fqgqntbmpsg4wbr0000gq/T/ruby-build.20240412165645.65510.orrVYI/ruby-3.3.0/lib/rubygems/installer.rb:495:in `generate_bin'
   	from /private/var/folders/g1/lsyk714x5fqgqntbmpsg4wbr0000gq/T/ruby-build.20240412165645.65510.orrVYI/ruby-3.3.0/lib/rubygems/installer.rb:335:in `install'
   	from ./tool/rbinstall.rb:881:in `block in install'
   	from ./tool/rbinstall.rb:721:in `no_write'
   	from ./tool/rbinstall.rb:881:in `install'
   	from ./tool/rbinstall.rb:989:in `block in install_default_gem'
   	from ./tool/rbinstall.rb:976:in `each'
   	from ./tool/rbinstall.rb:976:in `install_default_gem'
   	from ./tool/rbinstall.rb:913:in `block in <main>'
   	from ./tool/rbinstall.rb:1095:in `block in <main>'
   	from ./tool/rbinstall.rb:1092:in `each'
   	from ./tool/rbinstall.rb:1092:in `<main>'
    make: *** [do-install-all] Error 1

Before the installation I have run

$ brew info libyaml
$ brew uninstall libyaml
$ brew install libyaml

I have tried both with and without

--with-libyaml-dir=$(brew --prefix libyaml)

Installation seems to be in a half-installed, half-broken state

$ gem <anything> leads to a stack trace, for example $ gem list:

$ gem list
    $HOME/.rubies/ruby-3.3.0/lib/ruby/3.3.0/rubygems/yaml_serializer.rb:71:in `block in load': undefined method `[]=' for nil (NoMethodError)
    
                stack[depth][key] = val
                            ^^^^^^^
	from $HOME/.rubies/ruby-3.3.0/lib/ruby/3.3.0/rubygems/yaml_serializer.rb:58:in `split'
	from $HOME/.rubies/ruby-3.3.0/lib/ruby/3.3.0/rubygems/yaml_serializer.rb:58:in `load'

[deivid-rodriguez]

I think you're missing some recent fixes, like #7413. Can you update to latest ruby revision, and try again?

[jish]

"Can you update to latest ruby revision, and try again?"

That's what I'm trying to do... install the newest version of Ruby.

Or, to clarify, do you mean that I should install Ruby 3.0, then 3.1, then 3.2, then 3.3? I'm just trying to better understand 😅

Do you think that will (or that should?) make a difference?

[deivid-rodriguez]

I meant that you needed the latest unreleased Ruby, i.e., compile from source. Because looking into your backtrace, there are some fixes that Ruby 3.3.0 is missing like #7413.

[jish]

I found the issue. I had to remove curly braces and commas from my ~/.gemrc.

# ~/.gemrc
---
 :sources:
 - https://rubygems.org/
 - s3://my-gems/
-s3_source: {
-  my-gems: {
-    id: "abc123",
+s3_source:
+  my-gems:
+    id: "abc123"
     region: "us-west-2"
-  }
-}

My co-worker had given me a block of code to paste into my ~/.gemrc. This block of code had curly braces ({}) and commas (,) in it. The file looks and acts a lot like a YAML file so it seemed reasonable to do so.

However, it appears that the rubybems/rubygems project has a custom YAML parser that has slightly different semantics than a real YAML parser:

rubygems/lib/rubygems/yaml_serializer.rb

Line 4 in 153e98a

# A stub yaml serializer that can handle only hashes and strings (as of now).

A ~/.gemrc file with curly braces even parses as proper YAML.

require 'yaml'
puts YAML.load(<<-EOF
---
:sources:
- https://rubygems.org/
- s3://my-gems/
s3_source: {
  my-gems: {
    id: "abc123",
    region: "us-west-2"
  }
}
EOF
)
# => {:sources=>["https://rubygems.org/", "s3://my-gems/"], "s3_source"=>{"my-gems"=>{"id"=>"abc123", "region"=>"us-west-2"}}

The trick is, you need to ensure that your ~/.gemrc parses properly with Gem::YAMLSerializer:

require 'rubygems/yaml_serializer'
puts Gem::YAMLSerializer.load(<<-EOF
---
:sources:
- https://rubygems.org/
- s3://my-gems/
s3_source:
  my-gems:
    id: "abc123"
    region: "us-west-2"
EOF
)
# => {":sources"=>["https://rubygems.org/", "s3://my-gems/"], "s3_source"=>{"my-gems"=>{"id"=>"abc123", "region"=>"us-west-2"}}}

I removed curly braces ({}) and commas (,) from my ~/.gemrc and installation of Ruby 3.3 on my system works fine now 😄