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drafts: true📝 WalkthroughWalkthroughThe pull request introduces multispec-based generation for Ruby S2I images. It adds shared templates, runtime scripts, documentation, container definitions, application fixtures, and FIPS test coverage for Ruby 2.5 through 4.0. ChangesRuby S2I image generation
Priority: ⬇️ Low Estimated code review effort: 5 (Critical) | ~90 minutes Change: Refactor Sequence Diagram(s)sequenceDiagram
participant Builder
participant Multispec
participant Manifest
participant DockerfileTemplate
participant S2I
Builder->>Multispec: Select Ruby version and distro
Multispec->>Manifest: Provide generation matrix
Manifest->>DockerfileTemplate: Render image definition
DockerfileTemplate->>S2I: Install scripts and runtime files
S2I->>S2I: Assemble dependencies and start application
Merge Risk: 🟡 Moderate · up to The documented image can run application code as root, while a stale Fedora job and other configuration inconsistencies remain. These should be corrected before merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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jackorp
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September 15, 2026 16:41
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Inline comments:
In `@2.5/README.md`:
- Around line 4-7: Update the stream-specific README generation in src/README.md
so the selected matrix renders only the RHEL8 builder image availability text
for Ruby 2.5 and only the RHEL9 text for Ruby 3.0. Regenerate both 2.5/README.md
lines 4-7 and 3.0/README.md lines 4-7 from the template; do not edit the
rendered files directly.
In `@3.3/README.md`:
- Around line 231-233: Update the Dockerfile-list generation in src/README.md to
derive entries from each Ruby version’s supported matrix, then regenerate the
READMEs. In 3.3/README.md lines 231-233, include Dockerfile.rhel10; in
4.0/README.md lines 231-233, remove Dockerfile.rhel8.
In `@specs/multispec.yml`:
- Line 115: Remove the stale fedora-42-x86_64 entry from the 4.0 workflow matrix
in the distros configuration, preserving the other distribution entries.
In `@src/README.md`:
- Line 117: Update the Dockerfile example so it switches from root to non-root
user 1001 after dependency installation and before the CMD instruction, ensuring
the runtime application does not start with root privileges.
- Around line 215-223: The Puma memory guidance in the README conflicts with the
implementation. Update the section around the worker-memory formula to describe
the 256 MiB default from MEMORY_BYTES_PER_WORKER and explain that cgroup memory
limits workers based on that value, while documenting PUMA_WORKERS as the
override. Remove the outdated 50 + 15 * WORKERS + 0.125 * WORKERS *
PUMA_MAX_THREADS formula.
In `@src/s2i/bin/run`:
- Around line 36-37: Update the rackup-unavailable error branch in the run
script to execute exit 1 after printing both error messages, ensuring the
container reports startup failure instead of successful completion.
In `@test/test-fips/app.rb`:
- Line 13: Update the cipher name passed to OpenSSL::Cipher.new in the FIPS test
to match the /symmetric/aes-256-cbc endpoint, using aes-256-cbc so the test
exercises the advertised algorithm.
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⛔ Files ignored due to path filters (10)
src/test/puma-test-app/2.5/Gemfile.lockis excluded by!**/*.locksrc/test/puma-test-app/3.0/Gemfile.lockis excluded by!**/*.locksrc/test/puma-test-app/3.3/Gemfile.lockis excluded by!**/*.locksrc/test/puma-test-app/4.0/Gemfile.lockis excluded by!**/*.locksrc/test/puma-test-app/Gemfile.lockis excluded by!**/*.locksrc/test/rack-test-app/2.5/Gemfile.lockis excluded by!**/*.locksrc/test/rack-test-app/3.0/Gemfile.lockis excluded by!**/*.locksrc/test/rack-test-app/3.3/Gemfile.lockis excluded by!**/*.locksrc/test/rack-test-app/4.0/Gemfile.lockis excluded by!**/*.locksrc/test/rack-test-app/Gemfile.lockis excluded by!**/*.lock
📒 Files selected for processing (95)
2.5/Dockerfile.rhel82.5/README.md2.5/content_sets.yml2.5/s2i/bin/assemble2.5/test/examples/from-dockerfile/Dockerfile2.5/test/puma-test-app/Gemfile2.5/test/rack-test-app/Gemfile2.5/test/test-fips/Gemfile2.5/test/test-fips/app.rb2.5/test/test-fips/config.ru2.5/test/test-lib-openshift.sh2.5/test/test-lib-remote-openshift.sh2.5/test/test-openshift.yaml3.0/.exclude-c9s3.0/.exclude-rhel83.0/Dockerfile.c9s3.0/Dockerfile.rhel83.0/Dockerfile.rhel93.0/README.md3.0/s2i/bin/assemble3.0/test/examples3.0/test/examples/from-dockerfile/Dockerfile3.0/test/examples/from-dockerfile/Dockerfile.s2i3.0/test/examples/from-dockerfile/README.md3.0/test/examples/rails-postgresql-persistent.json3.0/test/examples/rails-postgresql.json3.0/test/examples/rails.json3.0/test/puma-test-app/Gemfile3.0/test/rack-test-app/Gemfile3.0/test/test-lib-openshift.sh3.0/test/test-lib-remote-openshift.sh3.0/test/test-openshift.yaml3.3/.exclude-c9s3.3/Dockerfile.c10s3.3/Dockerfile.c9s3.3/Dockerfile.fedora3.3/Dockerfile.rhel103.3/Dockerfile.rhel83.3/Dockerfile.rhel93.3/README.md3.3/test/examples3.3/test/examples/from-dockerfile/Dockerfile3.3/test/examples/from-dockerfile/Dockerfile.s2i3.3/test/examples/from-dockerfile/README.md3.3/test/examples/rails-postgresql-persistent.json3.3/test/examples/rails-postgresql.json3.3/test/examples/rails.json3.3/test/puma-test-app/Gemfile3.3/test/rack-test-app/Gemfile3.3/test/test-lib-openshift.sh3.3/test/test-lib-remote-openshift.sh3.3/test/test-openshift.yaml4.0/.exclude-c9s4.0/Dockerfile.c10s4.0/Dockerfile.c9s4.0/Dockerfile.fedora4.0/Dockerfile.rhel104.0/Dockerfile.rhel94.0/README.md4.0/test/examples4.0/test/examples/from-dockerfile/Dockerfile4.0/test/examples/from-dockerfile/Dockerfile.s2i4.0/test/examples/from-dockerfile/README.md4.0/test/examples/rails-postgresql-persistent.json4.0/test/examples/rails-postgresql.json4.0/test/examples/rails.json4.0/test/puma-test-app/Gemfile4.0/test/rack-test-app/Gemfilemanifest.ymlspecs/multispec.ymlsrc/Dockerfile.templatesrc/README.mdsrc/examples/from-dockerfile/Dockerfilesrc/root/opt/app-root/.gemrcsrc/root/opt/app-root/etc/puma.cfgsrc/s2i/bin/assemblesrc/s2i/bin/runsrc/s2i/bin/usagesrc/test/puma-test-app/2.5/Gemfilesrc/test/puma-test-app/3.0/Gemfilesrc/test/puma-test-app/3.3/Gemfilesrc/test/puma-test-app/4.0/Gemfilesrc/test/puma-test-app/Gemfilesrc/test/rack-test-app/2.5/Gemfilesrc/test/rack-test-app/3.0/Gemfilesrc/test/rack-test-app/3.3/Gemfilesrc/test/rack-test-app/4.0/Gemfilesrc/test/rack-test-app/Gemfiletest/puma-test-app/app.rbtest/puma-test-app/config.rutest/rack-test-app/app.rbtest/rack-test-app/config.rutest/test-fips/Gemfiletest/test-fips/app.rbtest/test-fips/config.ru
💤 Files with no reviewable changes (18)
- 4.0/Dockerfile.fedora
- 3.0/test/test-lib-openshift.sh
- 3.0/Dockerfile.rhel8
- 4.0/test/examples
- 3.3/test/test-lib-remote-openshift.sh
- 2.5/test/test-lib-openshift.sh
- 3.3/test/test-openshift.yaml
- 3.3/test/examples
- 4.0/Dockerfile.c9s
- 2.5/content_sets.yml
- 2.5/test/test-lib-remote-openshift.sh
- 3.0/test/test-openshift.yaml
- 3.3/Dockerfile.c9s
- 3.0/test/test-lib-remote-openshift.sh
- 3.0/Dockerfile.c9s
- 2.5/test/test-openshift.yaml
- 3.0/test/examples
- 3.3/test/test-lib-openshift.sh
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Instead of using .exclude* marker files we can just not generate the Dockerfiles in the first place by not having the combination in the multispec `include` section README.md: fix for section's "Building an application using a Dockerfile" numbered subsections 3.1 and 3.2. At some point, I can only assume there was an equivalent of `sed -i -e 's/3.1/3.2/g'` and equivalent for 3.2 -> 3.3 and so on until 4.0. However there was an unwanted result of the change that changed not only referenced ruby, but also the section number. Since the replace was global, the links were still correct though. Here, we bring it back to the intended numbering. multispect.yml: Use YAML anchors for generic things. These anchors can be injected into the specific sections to deduplicate common items used during generation. Assisted-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Each Ruby version may have special consideration to the required gem set. Specific distro choice usually does not enter the consideration to the Gemfile contents, the Ruby version is usually the deciding factor. Assisted-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The required files (Gemfile{,.lock}) are now templated via distgen.
We can move the files to the main test/ dir.
…rsions. Similarly to python, use equivalent of 'main_image', but name it such that it is clear its use is to be the reference image for README.
Multiple files seem to have been removed from the common module that existing versions referred to via a symlink. Remove those dangling symlinks.
Seems this file is here from RHEL 7 era, which is not a valid target of the repo for some time. We should be safe to just remove it, newer streams do not contain the file.
The comments explain why this was added, newer rubies do not contain the comments at all, we can just go forward without them. Newer bundler from newer rubies should not accept the deprecated setting form anyway.
Before distgen, due to Ruby 4.0's bundler >= 4.0, which no longer accepts the deprecated `--path` argument for `bundle install`, Ruby 2.5's from-dockerfile/Dockerfile test was forked to keep the deprecated form and `bundle config set` added for the Ruby >= 3.0. Special-case the file for Ruby 2.5, as it's the odd one out with the incompatibility. Assisted-by: Claude Sonnet 5 (1M context) <noreply@anthropic.com>
test-fips was not made for and is not expected to be used with RHEL 8. The specific pytest gates that correctly. But to prevent additional fork of files/generation, just add it also to Ruby 2.5 even if that Ruby is only available on RHEL 8.
While it doesnt seem we ever shipped for C9S, existance of at least one Dockerfile seems to be assumed for the distro column to exist and for the CI checks to not complain. Further decision on PR, but this commit should NEVER reach main branch.
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Migrate Ruby containers into distgen generation. Inspired by posgresql-container and s2i-python-container.
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New Features
Documentation