How to create a site using the latest version of Drupal and Composer.

Creating a new Drupal website on Acquia Cloud Platform: 
Before you begin, make sure you have Composer and Git installed in your development environment (e.g. your laptop or Cloud IDE)
1 - Clone your Acquia repository into a new folder like ProjectName and create a new branch:

git clone sitename@serverName.hosting.acquia.com:Sitename.git ProjectName
cd ProjectName
git checkout -b MyBranchName

2 - Creating a composer.json and composer.lock:

composer create-project --no-install drupal/recommended-project .

3 - Modify composer.json by replacing "web/" with "docroot/". You can use your preferred editor or run the following bash command:

sed -i'.original' 's/web\//docroot\//g' composer.json

4 - Add the asset-packagist.org as an additional repository to provide access to supplement packages.drupal.org and provide access to additional packages:

composer config repositories.1 composer https://asset-packagist.org

5 - Configure the location and name of the vendor directory:

composer config vendor-dir vendor

6 - Select your preferred installation type (options are source, dist or auto):

composer config preferred-install dist

7 - Add the following useful projects:

composer require drush/drush:^10.0 --no-update
composer require drupal/stage_file_proxy --no-update
composer require drupal/mysql56 --no-update
composer require cweagans/composer-patches --no-update

Note: The dependency drupal/mysql56 is currently required for Drupal 9.x and only for as long as MySQL 5.6 is the default version on Acquia Hosting. 

8 - Add the following in the section labeled "extra” in your composer.json for future patches. You can read Patching with Composer for more details.

"enable-patching": true,
"patches": {
  "drupal/[module_name]": {
    "Note regarding the nature of the patch being applied": "https://www.drupal.org/files/issues/[patch_name].patch"
  }
},

9 - Configure Composer to continue if a patch failed:

composer config extra.composer-exit-on-patch-failure false

10 - Add the following after the section labeled "extra” in your composer.json. These scripts will remove .git folders after each update to make sure git is tracking all files:

"scripts": {
  "post-install-cmd": [
    "find docroot vendor -name '.git' | xargs rm -rf",
    "find docroot vendor -name '.github' | xargs rm -rf"
  ],
  "post-update-cmd": [
    "find docroot vendor -name '.git' | xargs rm -rf",
    "find docroot vendor -name '.github' | xargs rm -rf"
  ]
}

11- Run the following composer command to install all dependencies. 

composer install

12 - Now you need to add your database connection. Copy default.settings.php over to settings.php. Then modify the settings.php by following the instructions on the Acquia require line documentation page.

cp docroot/sites/default/default.settings.php docroot/sites/default/settings.php

13 - Add the following to your settings.php for configuration management:

$settings["config_sync_directory"] = $app_root . '/../config/' . basename($site_path);

14 - Add and commit your code:

git add .
git commit -m "Initial commit of new Drupal core site."

15 - Push your changes to the Acquia repo. Run the following command and it will create a new tracking branch on the remote repo:

git push --set-upstream origin MyBranchName

16- Go to your Acquia Cloud and switch the code to your branch on your preferred testing environment (e.g. test or dev).
 
17 - Now you need to go to the site page and follow Drupal installation steps.
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