[DRE-maint] Bug#892196: ohai FTBFS with Ruby 2.5

[Adrian Bunk]

Source: ohai
Version: 8.21.0-1
Severity: serious
Tags: buster sid

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/ohai.html

...
Failures:

  1) Ohai::System plugin ruby should have version set to "2.3.6"
     Failure/Error: expect(@ruby_ohai_data[attribute]).to eql(value)

       expected: "2.3.6"
            got: "2.5.0"

       (compared using eql?)
     # ./spec/unit/plugins/ruby_spec.rb:56:in `block (3 levels) in <top (required)>'

  2) Ohai::System plugin ruby should have release_date set to "2017-12-14"
     Failure/Error: expect(@ruby_ohai_data[attribute]).to eql(value)

       expected: "2017-12-14"
            got: "2017-12-25"

       (compared using eql?)
     # ./spec/unit/plugins/ruby_spec.rb:56:in `block (3 levels) in <top (required)>'

  3) Ohai::System plugin ruby should have gems_dir set to "/var/lib/gems/2.3.0"
     Failure/Error: expect(@ruby_ohai_data[attribute]).to eql(value)

       expected: "/var/lib/gems/2.3.0"
            got: "/var/lib/gems/2.5.0"

       (compared using eql?)
     # ./spec/unit/plugins/ruby_spec.rb:56:in `block (3 levels) in <top (required)>'

  4) Ohai::System plugin ruby should have gem_bin set to "/usr/bin/gem2.3"
     Failure/Error: expect(@ruby_ohai_data[attribute]).to eql(value)

       expected: "/usr/bin/gem2.3"
            got: "/usr/bin/gem2.5"

       (compared using eql?)
     # ./spec/unit/plugins/ruby_spec.rb:56:in `block (3 levels) in <top (required)>'

  5) Ohai::System plugin ruby should have ruby_bin set to "/usr/bin/ruby2.3"
     Failure/Error: expect(@ruby_ohai_data[attribute]).to eql(value)

       expected: "/usr/bin/ruby2.3"
            got: "/usr/bin/ruby2.5"

       (compared using eql?)
     # ./spec/unit/plugins/ruby_spec.rb:56:in `block (3 levels) in <top (required)>'

Finished in 35.82 seconds (files took 3.06 seconds to load)
1599 examples, 5 failures, 2 pending

Failed examples:

rspec ./spec/unit/plugins/ruby_spec.rb[1:2] # Ohai::System plugin ruby should have version set to "2.3.6"
rspec ./spec/unit/plugins/ruby_spec.rb[1:3] # Ohai::System plugin ruby should have release_date set to "2017-12-14"
rspec ./spec/unit/plugins/ruby_spec.rb[1:12] # Ohai::System plugin ruby should have gems_dir set to "/var/lib/gems/2.3.0"
rspec ./spec/unit/plugins/ruby_spec.rb[1:13] # Ohai::System plugin ruby should have gem_bin set to "/usr/bin/gem2.3"
rspec ./spec/unit/plugins/ruby_spec.rb[1:14] # Ohai::System plugin ruby should have ruby_bin set to "/usr/bin/ruby2.3"

/usr/bin/ruby2.3 /usr/bin/rspec --pattern ./spec/\*\*/\*_spec.rb --format documentation failed
ERROR: Test "ruby2.3" failed. Exiting.
dh_auto_install: dh_ruby --install /build/1st/ohai-8.21.0/debian/ohai returned exit code 1
make: *** [debian/rules:6: binary] Error 1