Hatchbox Exports Env Vars With asdf

When you add env vars through the Hatchbox UI, they get exported to the environment of the asdf-shimmed processes. This is handled by the asdf-vars plugin. That plugin looks for .asdf-vars in the current chain of directories.

I can see there are many .asdf-vars files:

$ find . -name ".asdf-vars" -type f
./.asdf-vars
./my-app/.asdf-vars
./my-app/releases/20250120195106/.asdf-vars
./my-app/releases/20250121041054/.asdf-vars

And it is the one in my app's directory that contains the env vars that I set in the UI.

$ cat my-app/.asdf-vars
BUNDLE_WITHOUT=development:test
DATABASE_URL=postgresql://user_123:123456789012345@10.0.1.1/my_app_db
PORT=9000
RACK_ENV=production
RAILS_ENV=production
RAILS_LOG_TO_STDOUT=true
RAILS_MASTER_KEY=abc123
SECRET_KEY_BASE=abc123efg456

When I run a shimmed process like ruby, those env vars are loaded into the process's environment.

$ cd my-app/current
$ which ruby
/home/deploy/.asdf/shims/ruby
$ ruby -e "puts ENV['DATABASE_URL']"
postgresql://user_123:123456789012345@10.0.1.1/my_app_db

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