Running and installing Ruby in parallel using Rbenv with flock and Buildkite
I am maintaining a few Docker-images that contains all supported versions of Ruby, and they also ship with Jemalloc.
Because I use Buildkite, it is very easy for me to test multiple versions at the same time, but they all run the same setup script:
echo "--- setup rbenv" source ~/.bash_profile echo "--- setup ruby" rbenv local 2.7.7 || rbenv install 2.7.7 && rbenv local 2.7.7 echo "--- bundle setup" gem query --silent --installed --exact bundler || gem install bundler echo "--- tests" ruby tools/test.rb 3.1
This fails for some reason when multiple agents of Buildkite run in parallel, I don’t know if Rbenv or Rubygems gives any guarantees for this sort of usage, but nevertheless it fails.
Instead of digging into the intricacies of Rbenv and Rubygems we could make sure that the code above are only being executed by one agent at a time, we can do this with flock:
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