Ruby 3.0.0: `library not found for class Digest::SHA256`

rubyonrails-talk
#1

After changig my Rails app’s Gemfile to use Ruby 3.0.0 I get the following error when running bundle install:

~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/digest.rb:16:in 'const_missing': library not found for class Digest::SHA256 -- digest/sha2.so (LoadError)
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/digest.rb:100:in 'block in Digest'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/digest.rb:98:in 'synchronize'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/bundler/shared_helpers.rb:208:in 'digest'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/bundler/rubygems_gem_installer.rb:45:in 'block in validate_bundler_checksum'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/package/file_source.rb:29:in 'open'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/package/file_source.rb:29:in 'with_read_io'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/bundler/rubygems_gem_installer.rb:44:in 'validate_bundler_checksum'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/bundler/rubygems_gem_installer.rb:12:in 'pre_install_checks'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/installer.rb:286:in 'install'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/bundler/source/rubygems.rb:158:in 'install'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/bundler/installer/gem_installer.rb:67:in 'install'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/bundler/installer/gem_installer.rb:18:in 'install_from_spec'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/bundler/installer/parallel_installer.rb:163:in 'do_install'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/bundler/installer/parallel_installer.rb:154:in 'block in worker_pool'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/bundler/worker.rb:62:in 'apply_func'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/bundler/worker.rb:57:in 'block in process_queue'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/bundler/worker.rb:54:in 'loop'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/bundler/worker.rb:54:in 'process_queue'
        from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/bundler/worker.rb:88:in 'block (2 levels) in create_threads'

NB: I installed Ruby using rbenv and at first there was an SSL issue during installation, which I fixed (based on some suggestions found online) by pointing to the Homebrew-installed SSL library while running ruby-build (I am on macOS):

RUBY_CONFIGURE_OPTS=--with-openssl-dir=/usr/local/Cellar/openssl@1.1 rbenv install 3.0.0

Ruby itself now works fine, here is the output of ruby --version:

ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin20]

However irb shows the same error:

$ irb
irb(main):001:0> require 'digest'
=> true
irb(main):002:0> Digest::SHA256
Traceback (most recent call last):
        5: from ~/.rbenv/versions/3.0.0/bin/irb:23:in '<main>'
        4: from ~/.rbenv/versions/3.0.0/bin/irb:23:in 'load'
        3: from ~/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/irb-1.3.0/exe/irb:11:in '<top (required)>'
        2: from (irb):2:in '<main>'
        1: from ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/digest.rb:16:in 'const_missing'
LoadError (library not found for class Digest::SHA256 -- digest/sha2.so)
irb(main):003:0> Digest.constants
=> [:Instance, :Base, :Class, :REQUIRE_MUTEX]

Would someone have suggestions to fix the issue?

#2

Curious. Does ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/x86_64-darwin19/digest/sha2.bundle exist? (or similar?)

Using Pry:

[3] pry(main)> $ Digest

From: /Users/jon/.rbenv/versions/3.0.0/lib/ruby/3.0.0/digest.rb:4
Module name: Digest
Number of lines: 75

module Digest
  # A mutex for Digest().
  REQUIRE_MUTEX = Thread::Mutex.new

  def self.const_missing(name) # :nodoc:
    case name
    when :SHA256, :SHA384, :SHA512
      lib = 'digest/sha2.so'
    else
      lib = File.join('digest', name.to_s.downcase)
    end

    begin
      require lib
    rescue LoadError
      raise LoadError, "library not found for class Digest::#{name} -- #{lib}", caller(1)
    end
    unless Digest.const_defined?(name)
      raise NameError, "uninitialized constant Digest::#{name}", caller(1)
    end
    Digest.const_get(name)
  end

I could not find sha2.so in the require path, but sha2.bundle yes.

Then:

image
image1290×454 167 KB

#3

@joallard I have these files, there is no sha2 file:

$ ls ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/x86_64-darwin20/digest/
bubblebabble.bundle     md5.bundle              rmd160.bundle           sha1.bundle

I’ve never used pry but after doing gem install pry I could get the same output as you showed (however, first I had to run require 'digest'):

$ pry
[1] pry(main)> require 'digest'
=> true
[2] pry(main)> $ Digest

From: /Users/sdubois/.rbenv/versions/3.0.0/lib/ruby/3.0.0/digest.rb:4
Module name: Digest
Number of lines: 75

module Digest
  # A mutex for Digest().
  REQUIRE_MUTEX = Thread::Mutex.new

  def self.const_missing(name) # :nodoc:
    case name
    when :SHA256, :SHA384, :SHA512
      lib = 'digest/sha2.so'
    else
      lib = File.join('digest', name.to_s.downcase)
    end

    begin
      require lib
    rescue LoadError
      raise LoadError, "library not found for class Digest::#{name} -- #{lib}", caller(1)
    end
    unless Digest.const_defined?(name)
      raise NameError, "uninitialized constant Digest::#{name}", caller(1)
    end
    Digest.const_get(name)
  end

  # ...

As to your last screenshot it seems to show paths with Ruby 2.7.2 whereas I am trying with 3.0.0. In bash I could run this (after running brew install fd), it does not find any sha2 file:

$ for path in `ruby -e "puts \$:"`; do echo $path; fd sha2 $path; done
/usr/local/Cellar/rbenv/1.1.2/rbenv.d/exec/gem-rehash
/Users/sdubois/.rbenv/versions/3.0.0/lib/ruby/site_ruby/3.0.0
/Users/sdubois/.rbenv/versions/3.0.0/lib/ruby/site_ruby/3.0.0/x86_64-darwin20
/Users/sdubois/.rbenv/versions/3.0.0/lib/ruby/site_ruby
/Users/sdubois/.rbenv/versions/3.0.0/lib/ruby/vendor_ruby/3.0.0
/Users/sdubois/.rbenv/versions/3.0.0/lib/ruby/vendor_ruby/3.0.0/x86_64-darwin20
/Users/sdubois/.rbenv/versions/3.0.0/lib/ruby/vendor_ruby
/Users/sdubois/.rbenv/versions/3.0.0/lib/ruby/3.0.0
/Users/sdubois/.rbenv/versions/3.0.0/lib/ruby/3.0.0/x86_64-darwin20
#4

OK I could workaround the issue by uninstalling rbenv (rbenv uninstall 3.0.0 && brew uninstall rbenv) and installing Ruby from Homebrew (brew install ruby). Now I get this :+1:

$ ruby --version
ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin20]
$ irb
irb(main):001:0> require 'digest'
=> true
irb(main):002:0> Digest::SHA256
=> Digest::SHA256

I lost the ability to manage several rubies but hopefully that won’t be too bothersome.

#5

Hmm, that’s sure weird, I’m running Rbenv here as well.

My ls on Ruby 2.7 was an oversight, but mind you, I have a similar result with Ruby 3.0:

~> ls ~/.rbenv/versions/3.0.0/lib/ruby/3.0.0/x86_64-darwin19/digest/
[...]      sha1.bundle*         sha2.bundle*

I don’t see why that would be missing on a new installation. Maybe your installation randomly messed up perhaps?

In any case, if you ever need Rbenv again, you’ll probably be able to use it.

#6

I don’t really understand the problem but I’ve installed 3.0.0 with chruby and ruby-install, brew install ruby-install. “Switching from rbenv to … ruby-install and chruby”.

Pretty astonishing
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