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Documented the loadForEnv() method #10626

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javiereguiluz
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Fixes #10607.


.. versionadded:: 4.2
The ``Dotenv::loadForEnv()`` method was introduced in Symfony 4.2.

You should never store a ``.env`` file in your code repository as it might
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This sentence should be remove in favor of the paragraph you introduced, right?

the app on your local machine. The other two optional files (``.env`` +
"environment name" + ``.local`` and ``.env`` + "environment name") work
similarly, but they are specific to some environment.

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@dunglas dunglas Nov 5, 2018

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May I suggest to add the following:

Suggested change
``DotEnv::loadForEnv()`` implements the exact same behavior than Ruby's `dotenv library`_ and `Create React App's .env support`_. These projects provide extensive documentation about environment variables handling, that is worth reading.

@@ -112,3 +148,4 @@ Embed commands via ``$()`` (not supported on Windows):

.. _Packagist: https://packagist.org/packages/symfony/dotenv
.. _twelve-factor applications: http://www.12factor.net/
.. _`app config recommendations`: https://12factor.net/config
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Suggested change
.. _`app config recommendations`: https://12factor.net/config
.. _`app config recommendations`: https://12factor.net/config
.. _`dotenv library`: https://github.com/bkeepers/dotenv
.. _`Create React App's .env support`: https://facebook.github.io/create-react-app/docs/adding-custom-environment-variables#what-other-env-files-can-be-used

$dotenv->loadForEnv('dev', __DIR__.'/.env');
// Looks for env vars in these files (and in this order):
// .env.dev.local
// .env.local
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@dunglas dunglas Nov 5, 2018

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Will be loaded after .env.dev

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Will be loaded after .env.dev

Hmm. Are you sure? I didn't check the code, but if it's true it's not respecting the same priorities as https://github.com/bkeepers/dotenv/blob/master/README.md#what-other-env-files-can-i-use, i.e:

  • .env.[env].local
  • .env.local
  • .env.[env]
  • .env

Also, what about using the same presentation as bkeepers/dotenv? (The table with complementary information)

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@ogizanagi ogizanagi Nov 5, 2018

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But https://facebook.github.io/create-react-app/docs/adding-custom-environment-variables#what-other-env-files-can-be-used does load .env.local after .env.[env]...

IMHO, loading .env.local before .env.[env] makes more sense, as x.local should always allow override. Either you use .env.local to override for all environments, either you use .env.[env].local for a specific env. But .env and .env.[env] will only contains sensible defaults, so .env.[env] should not have precedence over .env.local.

// .env

The ``.env`` file should be committed to the shared repository and contains the
default env var values for the app. The optional ``.env.local`` file shouldn't
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@dunglas dunglas Nov 5, 2018

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Suggested change
default env var values for the app. The optional ``.env.local`` file shouldn't
default env var values for the app. The ``.env`` file should contain development-only settings. It **must not** contain any settings used in production. They are placeholder values helping during the onboarding process. The optional ``.env.local`` file shouldn't

// .env.test.local
// .env.test
// .env

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Suggested change
Similarly to ``DotEnv::load()``, ``DotEnv::loadForEnv()`` never overwrites existing environment variables, nor variables defined by files loaded previously. For instance, if the same variable is defined in both `.env` and `.env.test.local`, the value will be the one defined in `.env.test.local`, because this file is loaded first by ``DotEnv::loadForEnv()``.

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I would add somewhere something similar to https://github.com/bkeepers/dotenv/blob/master/README.md#can-i-use-dotenv-in-production last paragraph:

please note that env vars that are general to all environments should be stored in .env. Then, environment specific env vars should be stored in .env.<that environment's name>.

i.e no need to repeat all env vars. Only the ones likely to be specific for the target env.

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@ogizanagi ogizanagi left a comment

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Thanks a lot for working on this! ❤️

$dotenv->loadForEnv('dev', __DIR__.'/.env');
// Looks for env vars in these files (and in this order):
// .env.dev.local
// .env.local
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Will be loaded after .env.dev

Hmm. Are you sure? I didn't check the code, but if it's true it's not respecting the same priorities as https://github.com/bkeepers/dotenv/blob/master/README.md#what-other-env-files-can-i-use, i.e:

  • .env.[env].local
  • .env.local
  • .env.[env]
  • .env

Also, what about using the same presentation as bkeepers/dotenv? (The table with complementary information)

// .env.test.local
// .env.test
// .env

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I would add somewhere something similar to https://github.com/bkeepers/dotenv/blob/master/README.md#can-i-use-dotenv-in-production last paragraph:

please note that env vars that are general to all environments should be stored in .env. Then, environment specific env vars should be stored in .env.<that environment's name>.

i.e no need to repeat all env vars. Only the ones likely to be specific for the target env.

@weaverryan
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See symfony/recipes#481

But, those changes I believe also apply to 3.4

@nicolas-grekas
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nicolas-grekas commented Nov 10, 2018

Should be updated to account for #29129
Technically, the method is new to 4.2
But practically, the described behavior (loading .env < .env.local < .env.$env < .env.$env.local) works for new projects starting with 3.4 yes

@weaverryan
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And I think there are / will be a few more recipe changes still? Once those finish, we can finish this up as quickly as possible

@weaverryan
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See #10680 - it does not replace this PR (at least not entirely) as in #10680 I don't describe the actual new loadForEnv() method (though I do describe its behavior, which, thanks to the recipe changes, is available to any Symfony project in any version).

@nicolas-grekas
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Note that the method changed to loadEnv() with different signature and behavior.

@javiereguiluz
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I'm closing this because the handling of .env files is still "a moving target" and too many things are still changing. Let's work on this again after things settle down. Thanks!

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6 participants