Magento 2.4 fails to install due to missing composer config file in composer_home

Question

I tried to install Magento 2.4 via command line. It runs smooth until

[Progress: 653 / 1206]
Module 'Magento_ComposerRootUpdatePlugin':

At this step the installation fails with

Installing data... Reading /<magento_root>/composer.json
Loading config file /<magento_root>/composer.json
Failed to initialize global composer: Composer could not find the config file: /<magento_root>/var/composer_home/composer.json
To initialize a project, please create a composer.json file as described in the https://getcomposer.org/ "Getting Started" section

Composer is installed globally. The Magento documentation does not mention anything else regarding composer.

Thank you very much.

Answer 1

Here's a workaround - after creating the project from magento Repo, create the composer.json file

cd var
mkdir composer_home
cd composer_home
vim composer.json

composer.json contents-

{
}

Hope this works for you

Answer 2

I had the same problem. But it was solved by creating auth.json in var/composer_home like this

{
   "http-basic": {
      "repo.magento.com": {
         "username": "your username key",
         "password": "your password key"
      }
   }
}

Answer 3

@Gabriela

it works for me...but command prompt says

"Failed to initialize global composer: Composer could not find the config file: C:/xampp/htdocs/magento/var/composer_home/composer.json"

should i create composer.json instead of auth.json and add your mentioned code.

also please mention, which username and password should i add.

many thanks, rakshith

Answer 4

Installed 2.4 ok but got this same error running setup:upgrade. 2.4.x requires composer v2.

Run composer self-update --2 from appropriate account and issue should go away. If you get permission denied and can't elevate then your hosting company will need to do this.