Getting the name of a release during build in V1.9

Questions / Help
1

I’d like to get the release-name during mix release build, so I can do something smart in my config.exs. I see the release name is available at runtime via System.get_env(“RELEASE_NAME”), but it looks like the onlyway I can get a populated %Mix.Release{} is via step function.

2

Shouldn’t the release name be the same as your application name?

3

You also get access to the Mix.Release struct in the generated rel/*.eex template files.

Can you talk a bit more about your exact use case?

If you don’t specify :releases key (you can have many releases) in your mix.exs file then yes, the app name would be the default release name.

4

Thanks, here’s my dummed down use case. I have four different releases, each release is deployed to connect to a different backend database. What I’m looking for is in my config/config.exs is to have something like

import_config "#{Mix.release_name()}/db_config.exs"

Also, I really want to rename config/config.exs to config/buildtime_config.exs, and config/releases.exs to config/runtime_config.exs. :slight_smile:

5

Got it, I’m not sure such can be achieved today without using RELEASE_NAME env var.

If this configuration is for DB settings and such, perhaps you could build a single release and control these using env variables?

Also, I really want to rename config/config.exs to config/buildtime_config.exs, and config/releases.exs to config/runtime_config.exs.

You should be able to do this by setting in mix.exs:

def project() do
  [
    config_path: "config/buildtime_config.exs",
    releases: [
      foo: [
        runtime_config_path: "config/runtime_config.exs"
      ]
    ]
  ]
end