Magento installation via metapackage: checkExtensions fails

[oleksii-lisovyi]

Preconditions (*)

1. Magento 2.2.*.

Steps to reproduce (*)

1. Install Magento via composer as a metapackage (according to docs):

composer create-project --repository=https://repo.magento.com/ magento/project-community-edition <install-directory-name>

2. Install package, that has a PHP extension dependency, that is not added to your PHP:
   I've installed aws/aws-sdk-php, for example, that has dependency on sockets extension as a dev requirement:

composer require aws/aws-sdk-php

3. Perform Magento installation from root directory:

php bin/magento setup:install <add all the required options here>

Expected result (*)

Installation finishes successfully.

Actual result (*)

Installation failed with error:

Starting Magento installation:
File permissions check...
[Progress: 1 / 773]
Required extensions check...

In Installer.php line 519:
                                           
  [Exception]                              
  Missing following extensions: 'sockets'  
                                           

Exception trace:
 () at /<magento-root-directory>/setup/src/Magento/Setup/Model/Installer.php:519

Technical details (*)

There is implemented check on the required extensions in the method
\Magento\Setup\Model\Installer::checkExtensions, that calls \Magento\Setup\Model\PhpReadinessCheck::checkPhpExtensions, that calls \Magento\Framework\Composer\ComposerInformation::getRequiredExtensions, that returns list of dependencies from composer.lock file:

        $requiredExtensions = [];
        $allPlatformReqs = array_keys($this->getLocker()->getPlatformRequirements(true));

        if (!$this->isMagentoRoot()) {
            /** @var CompletePackageInterface $package */
            foreach ($this->getLocker()->getLockedRepository()->getPackages() as $package) {
                $requires = array_keys($package->getRequires());
                $requires = array_merge($requires, array_keys($package->getDevRequires()));
                $allPlatformReqs = array_merge($allPlatformReqs, $requires);
            }
        }
        foreach ($allPlatformReqs as $reqIndex) {
            if (substr($reqIndex, 0, 4) === 'ext-') {
                $requiredExtensions[] = substr($reqIndex, 4);
            }
        }
        return array_unique($requiredExtensions);

The root issue: method $this->isMagentoRoot() returns FALSE for current Magento installation, because its regular expression /magento\/magento2...?/ doesn't match magento/project-community-edition, that comes from metapackage.
Most likely it works OK for Magento, because current Magento package name is magento/magento2ce, that matches the regular expression above.

[magento-engcom-team]

Hi @oleksii-lisovyi. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

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• Information on your environment
• Steps to reproduce
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Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento-engcom-team give me 2.3-develop instance - upcoming 2.3.x release

For more details, please, review the Magento Contributor Assistant documentation.

@oleksii-lisovyi do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[magento-engcom-team]

Hi @engcom-backlog-nazar. Thank you for working on this issue.
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[magento-engcom-team]

✅ Confirmed by @engcom-backlog-nazar
Thank you for verifying the issue. Based on the provided information internal tickets MAGETWO-98219, MAGETWO-98220 were created

Issue Available: @engcom-backlog-nazar, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[magento-engcom-team]

Hi @oleksii-lisovyi. Thank you for your report.
The issue has been fixed in #22116 by @oleksii-lisovyi in 2.3-develop branch
Related commit(s):

• 2c91e5a431fc3fe6aab36b29205ec2e487993f96

The fix will be available with the upcoming 2.3.3 release.