Adds reproducibility tests

[ForestEckhardt]

Resolves #811

Checklist

• I have viewed, signed, and submitted the Contributor License Agreement.
• I have linked issue(s) that this PR should close using keywords or the Github UI (See docs)
• I have added an integration test, if necessary.
• I have reviewed the styleguide for guidance on my code quality.
• I'm happy with the commit history on this PR (I have rebased/squashed as needed).

[ForestEckhardt]

Passenger container-diff diff passenger1 passenger2 --type=file output:

-----File-----

These entries have been added to passenger1: None

These entries have been deleted from passenger1: None

These entries have been changed between passenger1 and passenger2:
FILE                                                                                                                                      SIZE1        SIZE2
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/passenger-6.0.14/gem_make.out        1.5K         1.5K

[ForestEckhardt]

Puma container-diff diff puma1 puma2 --type=file output:

-----File-----

These entries have been added to puma1: None

These entries have been deleted from puma1: None

These entries have been changed between puma1 and puma2:
FILE                                                                                                                                 SIZE1        SIZE2
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/gems/nio4r-2.5.2/ext/nio4r/Makefile                                  8.1K         8.1K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/gems/puma-4.3.5/ext/puma_http11/Makefile                             8K           8K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/nio4r-2.5.2/gem_make.out        3.4K         3.4K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/puma-4.3.5/gem_make.out         1.2K         1.2K

[ForestEckhardt]

Rackup container-diff diff rackup1 rackup2 --type=file output:

-----File-----

These entries have been added to rackup1: None

These entries have been deleted from rackup1: None

These entries have been changed between rackup1 and rackup2: None

[ForestEckhardt]

Rails container-diff diff rails1 rails2 --type=file output:

-----File-----

These entries have been added to rails1:
FILE                                                                                                                                        SIZE
/layers/paketo-buildpacks_rails-assets/assets/public-assets/.sprockets-manifest-b918d147ec7a1a00a4a47fd643261466.json                       818B
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/Bf                                                          130B
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/Bf/BfHVVJbIHY1bS5uEKkAv7_7ch__Olro8_PCek8ZS1ZQ.cache        130B
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/C0                                                          1.7K
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/C0/C0AFMYKhc8b6_Md-ozPa_nq44mjo_eYRzeL7wPQD8Ag.cache        1.7K
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/H1                                                          1.4K
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/H1/H16fZfkugyondzV_1XT3EGD8aWjwprxVEVd3fzgAxLE.cache        1.4K
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/aN                                                          136B
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/aN/aNm6_u0imFiirEgfMU1BVJZf3-E-InsOhAmkEOh33ps.cache        136B

These entries have been deleted from rails1:
FILE                                                                                                                                        SIZE
/layers/paketo-buildpacks_rails-assets/assets/public-assets/.sprockets-manifest-664fa7c6f8d6db219f28831774b4860c.json                       818B
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/2f                                                          136B
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/2f/2fyBBHiLuTbeeKv_bsZMpBBTjO9ErOojJ20qp7Z_n1Q.cache        136B
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/58                                                          1.4K
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/58/58_5vKs80bVbicpya6K_AfDVoPdCZ6tW73njJF3lCkM.cache        1.4K
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/QB                                                          130B
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/QB/QB5qKDRSSW2sO2X0oZGlUa9loklHVoiE8aMq4jgb1FI.cache        130B
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/r2                                                          1.7K
/layers/paketo-buildpacks_rails-assets/assets/tmp-cache-assets/sprockets/v4.0.0/r2/r2yJDF9WWxa-AEp7LuJGwrzAYF8_7hWfjGmgZXnKy90.cache        1.7K

These entries have been changed between rails1 and rails2:
FILE                                                                                                                                                   SIZE1        SIZE2
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/gems/ffi-1.15.0/ext/ffi_c/libffi-x86_64-linux/config.log                               56.2K        56.2K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/ffi-1.15.0/gem_make.out                           21.3K        21.3K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/gems/sassc-2.4.0/ext/Makefile                                                          9.4K         9.4K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/gems/ffi-1.15.0/ext/ffi_c/Makefile                                                     8.4K         8.4K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/gems/nio4r-2.5.7/ext/nio4r/Makefile                                                    8.1K         8.1K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/gems/puma-4.3.7/ext/puma_http11/Makefile                                               8K           8K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/gems/racc-1.5.2/ext/racc/cparse/Makefile                                               7.9K         7.9K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/gems/websocket-driver-0.7.3/ext/websocket-driver/Makefile                              7.9K         7.9K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/nio4r-2.5.7/gem_make.out                          3.4K         3.4K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/sassc-2.4.0/gem_make.out                          3.2K         3.2K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/puma-4.3.7/gem_make.out                           975B         976B
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/websocket-driver-0.7.3/gem_make.out               887B         889B
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/racc-1.5.2/gem_make.out                           842B         842B
/layers/paketo-buildpacks_rails-assets/assets/public-assets/manifest-b4bf6e57a53c2bdb55b8998cc94cd00883793c1c37c5e5aea3ef6749b4f6d92b.js.gz            22B          22B
/layers/paketo-buildpacks_rails-assets/assets/public-assets/application-04024382391bb910584145d8113cf35ef376b55d125bb4516cebeb14ce788597.css.gz        20B          20B

NOTE: container-diff must have some form of caching and it was giving me bad readings for images with the same name.

[ForestEckhardt]

Rake container-diff diff rake1 rake2 --type=file output:

------File-----

These entries have been added to rake1: None

These entries have been deleted from rake1: None

These entries have been changed between rake1 and rake2: None

[ForestEckhardt]

Thin container-diff diff thin1 thin2 --type=file output:

-----File-----

These entries have been added to thin1: None

These entries have been deleted from thin1: None

These entries have been changed between thin1 and thin2:
FILE                                                                                                                                        SIZE1        SIZE2
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/gems/eventmachine-1.2.7/ext/Makefile                                        8.5K         8.5K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/gems/eventmachine-1.2.7/ext/fastfilereader/Makefile                         7.9K         7.9K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/gems/thin-1.8.1/ext/thin_parser/Makefile                                    7.9K         7.9K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/eventmachine-1.2.7/gem_make.out        892B         891B
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/thin-1.8.1/gem_make.out                860B         861

[ForestEckhardt]

Unicorn container-diff diff unicorn1 unicorn2 --type=file output:

-----File-----

These entries have been added to unicorn1: None

These entries have been deleted from unicorn1: None

These entries have been changed between unicorn1 and unicorn2:
FILE                                                                                                                                      SIZE1         SIZE2
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/raindrops-0.20.0/mkmf.log            129.7K        129.7K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/kgio-2.11.4/mkmf.log                 42.3K         42.3K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/raindrops-0.20.0/gem_make.out        10.2K         10.2K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/gems/kgio-2.11.4/ext/kgio/Makefile                                        9K            9K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/gems/unicorn-6.1.0/ext/unicorn_http/Makefile                              8.1K          8.1K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/gems/raindrops-0.20.0/ext/raindrops/Makefile                              8.1K          8.1K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/kgio-2.11.4/gem_make.out             2.5K          2.5K
/layers/paketo-buildpacks_bundle-install/launch-gems/ruby/2.7.0/extensions/x86_64-linux/2.7.0-static/unicorn-6.1.0/gem_make.out           1K            1K

[ForestEckhardt]

I think that the deviation in runs for most of these happens somewhere in these lines of code https://github.com/ruby/ruby/blob/00f411c58ac6105f135ff4501ea5bd1d691fcc32/lib/mkmf.rb#L2000-L2014 but I am unclear on how it is happening.

[ForestEckhardt]

I have not been able to reproduce the the behavior where a seemingly random string is selected in the repl on the final build container. My next idea is to modify the bundle-install buildpack to allow the build phase to be intercept and see if it can be reproduced in repl there.

[sophiewigmore]

@ryanmoran I'd love to get these tests merged in to main before I cut a release of the ruby language family. Does anything else need to change here?