Make "rake debug" protective for a Ruby OpenSSL loading error.

[junaruga]

This PR is to make "rake debug" enhanced, on the way suggested at #780 (comment). I didn't need to take the rake debug out from Rakefile. Because the ruby code is executed in the child process by the ruby %Q(-I./lib -ropenssl.so -ve'#{ruby_code}') in the Rakefile.

---

We experienced a FIPS case specific Ruby OpenSSL error in the loading process of Ruby OpenSSL by calling the ruby -ropenssl (require 'openssl') built with OpenSSL master branch which includes the commit openssl/openssl@6d47e81 but doesn't include the commit openssl/openssl@3c6e114 fixing the issue.

The following error happened at lib/openssl.rb:22 calling the lib/openssl/ssl.rb with the OpenSSL commit
<14e46600c68ece74970462a60ad20703221747a1> which is between the above 2 commits.

$ OPENSSL_CONF=/home/jaruga/.local/openssl-3.4.0-dev-fips-debug-14e46600c6/ssl/openssl_fips.cnf \
  bundle exec rake debug
...
ruby 3.4.0dev (2024-07-22T08:33:07Z master 82aee1a946) [x86_64-linux]
/home/jaruga/var/git/ruby/openssl/lib/openssl/pkey.rb:132:in 'OpenSSL::PKey::DH#initialize': could not parse pkey (OpenSSL::PKey::DHError)
  from /home/jaruga/var/git/ruby/openssl/lib/openssl/pkey.rb:132:in 'Class#new'
  from /home/jaruga/var/git/ruby/openssl/lib/openssl/pkey.rb:132:in 'OpenSSL::PKey::DH.new'
  from /home/jaruga/var/git/ruby/openssl/lib/openssl/ssl.rb:36:in '<class:SSLContext>'
  from /home/jaruga/var/git/ruby/openssl/lib/openssl/ssl.rb:23:in '<module:SSL>'
  from /home/jaruga/var/git/ruby/openssl/lib/openssl/ssl.rb:22:in '<module:OpenSSL>'
  from /home/jaruga/var/git/ruby/openssl/lib/openssl/ssl.rb:21:in '<top (required)>'
  from /home/jaruga/var/git/ruby/openssl/lib/openssl.rb:22:in 'Kernel#require_relative'
  from /home/jaruga/var/git/ruby/openssl/lib/openssl.rb:22:in '<top (required)>'
  from /home/jaruga/.local/ruby-3.4.0dev-debug-82aee1a946/lib/ruby/3.4.0+0/bundled_gems.rb:71:in 'Kernel.require'
  from /home/jaruga/.local/ruby-3.4.0dev-debug-82aee1a946/lib/ruby/3.4.0+0/bundled_gems.rb:71:in 'block (2 levels) in Kernel#replace_require'
rake aborted!

This commit enables the rake debug still to print the debugging values in such cases. In this case, the rake debug prints only the base provider without fips provider. That was a bug of OpenSSL.

$ OPENSSL_CONF=/home/jaruga/.local/openssl-3.4.0-dev-fips-debug-14e46600c6/ssl/openssl_fips.cnf \
  bundle exec rake debug
...
ruby 3.4.0dev (2024-07-22T08:33:07Z master 82aee1a946) [x86_64-linux]
OpenSSL::OPENSSL_VERSION: OpenSSL 3.4.0-dev
OpenSSL::OPENSSL_LIBRARY_VERSION: OpenSSL 3.4.0-dev
OpenSSL::OPENSSL_VERSION_NUMBER: 30400000
OpenSSL::LIBRESSL_VERSION_NUMBER: undefined
FIPS enabled: true
Providers: base

[rhenium]

I didn't need to take the rake debug out from Rakefile. Because the ruby code is executed in the child process by the ruby %Q(-I./lib -ropenssl.so -ve'#{ruby_code}') in the Rakefile.

You're right.

Seems good to me!

[junaruga]

Thanks for your review!