Fix Ruby 4.0 bundle install permission error #2832
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Ruby 4.0.1 CI jobs are failing with this error: ``` Bundler cannot reinstall erb-6.0.1 because there's a previous installation of it at /opt/hostedtoolcache/Ruby/4.0.1/x64/lib/ruby/gems/4.0.0/gems/erb-6.0.1 that is unsafe to remove. The parent of /opt/hostedtoolcache/Ruby/4.0.1/x64/lib/ruby/gems/4.0.0/gems/erb-6.0.1 is world-writable and does not have the sticky bit set, making it insecure to remove due to potential vulnerabilities. ``` This is caused by GitHub Actions runner image having improper permissions for Ruby 4.0.1's gem directory. This is similar to the issue that was fixed for Ruby 3.2 in 2024: - ruby/setup-ruby#624 - actions/runner-images#10215 Workaround: Set bundle path to vendor/bundle to avoid using the problematic system gem directory. This is a temporary fix until the upstream issue is resolved. Co-Authored-By: Claude <noreply@anthropic.com>
Using 'bundle config set --local path' caused issues with multiple Gemfile setups (root Gemfile and steep/Gemfile). The environment variable approach is cleaner and doesn't persist configuration to .bundle/config. Co-Authored-By: Claude <noreply@anthropic.com>
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Problem
Ruby 4.0.1 CI jobs fail with permission error when trying to reinstall erb:
Failed run: https://github.com/ruby/rbs/actions/runs/21500893368/job/61946774227
Solution
Set
BUNDLE_PATHtovendor/bundleto avoid the problematic system gem directory.This is a temporary workaround. Similar issue occurred with Ruby 3.2 and was resolved upstream:
bundle installwith cached Ruby version fails actions/runner-images#10215