bazel-contrib/rules_ruby

Expose source files from an rb_gem as rb_library or java jars

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#293 opened on Jan 22, 2026

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 (1 comment) (0 reactions) (0 assignees)Starlark (20 forks)github user discovery
enhancementhelp wanted

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Description

Would like to be able to directly reference a specific source file included in an rb_gem installed in a bundle repo.

For example to use the warbler jar in a java based target elsewhere.

java_import(
    name = "WarblerJar",
    jars = [".gem/gems/warbler-2.0.4/lib/warbler_jar.jar"],
)

Right now you must reference a file in the file system outside of bazel and know its specific path. I'm guessing we'd need bundle install to run to unpack the .gem archive, and then generate rb_library targets and java targets based on the outputted file extensions after.

Contributor guide

Research direction
Investigate how rb gem currently generates targets and whether bundle install can be integrated to unpack gems and create rb library/java jar targets based on file extensions.
Tech stack
rubyjava
Domain
build systemtooling
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
BazelRuby
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60