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.

• Muhammmd Ahmad Anwar: Facing the Same Error Failed to initialize global composer: Composer could not find the config file: /Users/mac/sites/ewlicense/var/composer_home/composer.json To initialize a project, please create a composer.json file as described in the getcomposer.org "Getting Started" section I also tried composer self-update but it still not fixed the issue. the Url is giving me 502 Bag Gateway
• KaMZaTa: I'm facing the same issue...
• KaMZaTa: @hardy123480 Were you able to install Magento 2.4.0 even if it's shown this error?
• hardy123480: Kind of. What I now tried is to install a local instance of composer in the Magnet root directory. It still throws the error but the installation goes through successfully. Unfortunately, I get 502 Bad Gateway if I want to access the frontend / backend. I'm running out of ideas.
• KaMZaTa: @hardy123480 which php version are you running? 7.4.8?

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

• Adrian R: has you installed custom modules via composer in vendor source path ? and installed or register in magento ?

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.