rake assets:precompile failing during push to Heroku

Question

I'm currently using asset_sync in my Rails app, and I have the environment variables set in my Heroku app. When I run heroku config I get: ``` AWS_ACCESS_KEY_ID: XXXXXXXXXXXXXXXXXX AWS_SECRET_ACCESS_KEY: XXXXXXXXXXXXXXXXXX FOG_DIRECTORY: MY-BUCKET-NAME FOG_PROVIDER: AWS etc... ``` When I push my app to Heroku, it tries to run rake assets:precompile and I get the following message: ``` Preparing app for Rails asset pipeline Running: rake assets:precompile /usr/local/bin/ruby /tmp/build_2pa7aisux9av8/vendor/bundle/ruby/1.9.1/bin/rake assets:precompile:nondigest RAILS_ENV=production RAILS_GROUPS=assets AssetSync: using /tmp/build_2pa7aisux9av8/config/initializers/asset_sync.rb rake aborted! Fog directory can't be blank, Aws access key can't be blank, Aws secret access key can't be blank ``` But then I run: ``` heroku run rake assets:precompile --app my-app-name ``` ...and it processes everything and syncs to S3 just fine: ``` Running `rake assets:precompile` attached to terminal... up, r…

Accepted Answer

I can see you're running the assets:precompile rake task with `--app my-app-name` option. Just to be sure, do you have multiple apps on `Heroku`? (eg. staging and production). If you do make sure make sure running heroku config `--app my-app-name` results in the output you had with `heroku` config.

If you had the expected results with the above command, it's likely the `ENV` vars aren't available on git push as suggested here asset_sync_test github readme . You can go around that by using the following in your `config/environments/*.rb` file:

```
config.asset_sync.aws_access_key = ENV['AWS_ACCESS_KEY_ID']
config.asset_sync.aws_access_secret = ENV['AWS_SECRET_ACCESS_KEY']
config.asset_sync.aws_bucket = ENV['FOG_DIRECTORY']
config.asset_sync.fog_provider = ENV['FOG_PROVIDER']
```

rake assets:precompile failing during push to Heroku

Solution

Problem