Command line error stock magento

Question

I get this error after install when trying to clear var/ generation, and static content deploy via command line.

[Exception] Warning: Invalid argument supplied for foreach() in /vendor/magento/module-store/Model/Config/Processor/Fallback.php on line 125

Answer 1

The problem was in app/etc/env.php file which was empty.

I restored the content of this file with the local data and it started working again.

Answer 2

This can happen when trying to build a magento site when the DB is not reachable and the config file doesn't have any stores set.

You should be able to run php bin/magento app:config:dump on a working instance to see what app/etc/config.php and app/etc/env.php should look like. The minimum we have got it to is: app/etc/config.php

<?php
return array(
    'modules' =>
        array(
            ...
        ),
    'scopes' =>
        array(
            'websites' =>
                array(
                    'admin' =>
                        array(
                            'website_id' => '0',
                            'code' => 'admin',
                            'name' => 'Admin',
                            'sort_order' => '0',
                            'default_group_id' => '0',
                            'is_default' => '0',
                        ),
                    'uk' =>
                        array(
                            'website_id' => '2',
                            'code' => 'uk',
                            'name' => 'United Kingdom',
                            'sort_order' => '2',
                            'default_group_id' => '2',
                            'is_default' => '1',
                        ),
                ),
            'groups' =>
                array(
                    0 =>
                        array(
                            'group_id' => '0',
                            'website_id' => '0',
                            'code' => 'default',
                            'name' => 'Default',
                            'root_category_id' => '0',
                            'default_store_id' => '0',
                        ),
                    2 =>
                        array(
                            'group_id' => '2',
                            'website_id' => '2',
                            'code' => 'united_kingdom_group',
                            'name' => 'United Kingdom',
                            'root_category_id' => '1838',
                            'default_store_id' => '2',
                        ),
                ),
            'stores' =>
                array(
                    'admin' =>
                        array(
                            'store_id' => '0',
                            'code' => 'admin',
                            'website_id' => '0',
                            'group_id' => '0',
                            'name' => 'Admin',
                            'sort_order' => '0',
                            'is_active' => '1',
                        ),
                    'uk' =>
                        array(
                            'store_id' => '2',
                            'code' => 'uk',
                            'website_id' => '2',
                            'group_id' => '2',
                            'name' => 'United Kingdom',
                            'sort_order' => '0',
                            'is_active' => '1',
                        ),
                ),
        ),
);

app/etc/env.php

<?php
return array (
  'system' => 
  array (
    'default' => 
    array (
      'dev' => 
      array (
        'js' => 
        array (
          'minify_files' => '1',
          'merge_files' => '0',
          'enable_js_bundling' => '0',
        ),
        'css' => 
        array (
          'merge_css_files' => '0',
          'minify_files' => '0',
        ),
      ),
    ),
  ),
  'cache_types' => 
  array (
    'compiled_config' => 1,
  ),
);

You will need to update app/etc/config.php to match your store information, list can be obtained from the db tables:
- store
- store_group
- store_website

Hope this helps