It appears that it is (now) not possible to install Drupal 8 with the standard or testing profile, and your own $config_directories setting.

Users should be allowed to set their own $config_directories (and database connection details, etc.) in settings.php before installing.

Steps to reproduce

1. Before installing, open settings.php (or settings.local.php) and customize $config_directories:

$config_directories = array(
  CONFIG_ACTIVE_DIRECTORY => '/some/valid/file/path/active',
  CONFIG_STAGING_DIRECTORY => '/some/valid/file/path/staging',

2. Install the standard profile (either via drush si or core/install.php)

3. You will receive the error message:

exception 'Drupal\Core\Config\PreExistingConfigException' with message 'Configuration objects (system.cron, system.theme) provided by standard already exist in active configuration' in
Stack trace:
#0 core/lib/Drupal/Core/Config/ConfigInstaller.php(442):
Drupal\Core\Config\PreExistingConfigException::create('standard', Array)
#1 core/lib/Drupal/Core/Extension/ModuleInstaller.php(156):
Drupal\Core\Config\ConfigInstaller->checkConfigurationToInstall('module', 'standard')
#2 core/includes/
Drupal\Core\Extension\ModuleInstaller->install(Array, false)
#3 core/includes/
#4 core/includes/ install_run_task(Array,
#5 core/includes/ install_run_tasks(Array)
#6 ~/.composer/vendor/drush/drush/includes/ install_drupal(Object(Composer\Autoload\ClassLoader), Array)

4. Repeat the process with the 'minimal' profile. The install will succeed.

5. Repeat the process with the 'testing' profile. The install will fail with a slightly different error, but the same basic problem: "Configuration objects (system.theme)
provided by testing already exist in active configuration"

Here's how to do the same thing with my attached test script. You may need to set some env vars or modify the script to set your DB credentials, etc.

# Fails.
sh ./test-2461341-with-vars.sh_.txt

# Succeeds.
PROFILE=minimal sh ./test-2461341-with-vars.sh_.txt

# Fails.
PROFILE=testing sh ./test-2461341-with-vars.sh_.txt
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pjcdawkins’s picture

Component: configuration system » theme system
1.57 KB

This is clearly a bug in the standard profile - minimal works fine.

I've written a little test script to reproduce this consistently, on my machine at least - attached.

pjcdawkins’s picture

Title: Install fails with PreExistingConfigException when a custom active config directory is set » Install fails with PreExistingConfigException when a custom config directory is set
Component: theme system » install system
Issue summary: View changes
1.57 KB

My test script had a couple of bugs.

It turns out that the 'testing' profile fails too, with a slightly different error. Updated summary.

alexpott’s picture

I think you'll find this is a duplicate of #2451363: Ensure install_profile is exists in settings.php after installation

Just add

$settings['install_profile'] = 'standard';

Or whatever profile you are testing and you'll find everything works as expected.

Leaving as active for confirmation. @pjcdawkins please close once you have confirmed. Re - the installation process in D8 has more test coverage that any previous version of D8 btw - have a look at InstallerTestBase and the classes that extend from that.

pjcdawkins’s picture

Status: Active » Closed (works as designed)

Confirmed - you're absolutely right. Thank you.

alexpott’s picture

Status: Closed (works as designed) » Closed (duplicate)