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Add Hatchbox Exports Env Vars With asdf as a Devops TIL

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2025-01-21 15:36:44 -06:00
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README.md
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@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
_1569 TILs and counting..._
_1570 TILs and counting..._
See some of the other learning resources I work on:
- [Ruby Operator Lookup](https://www.visualmode.dev/ruby-operators)
@@ -200,6 +200,7 @@ See some of the other learning resources I work on:
- [Check The Syntax Of nginx Files](devops/check-the-syntax-of-nginx-files.md)
- [Connect To An RDS PostgreSQL Database](devops/connect-to-an-rds-postgresql-database.md)
- [Determine The IP Address Of A Domain](devops/determine-the-ip-address-of-a-domain.md)
- [Hatchbox Exports Env Vars With asdf](devops/hatchbox-exports-env-vars-with-asdf.md)
- [Path Of The Packets](devops/path-of-the-packets.md)
- [Push Non-master Branch To Heroku](devops/push-non-master-branch-to-heroku.md)
- [Reload The nginx Configuration](devops/reload-the-nginx-configuration.md)

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devops/hatchbox-exports-env-vars-with-asdf.md Normal file
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# Hatchbox Exports Env Vars With asdf
When you add env vars through the [Hatchbox](https://hatchbox.io/) UI, they get
exported to the environment of the asdf-shimmed processes. This is handled by
the [`asdf-vars` plugin](https://github.com/excid3/asdf-vars). That plugin
looks for `.asdf-vars` in the current chain of directories.
I can see there are many `.asdf-vars` files:
```bash
$ 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.
```bash
$ 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.
```bash
$ 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
```
[source](https://www.visualmode.dev/hatchbox-manages-env-vars-with-asdf)