Magento 2 - bin/magento suddenly stopped working

Question

If I execute php bin/magento list then nothing happens.

It stopped working after executing composer update and grunt clean

If I open the frontend I get

Fatal error: require_once(): Failed opening required '/home/xxx/yyy/vendor/composer/autoload_real.php' (include_path='.:/opt/cpanel/ea-php72/root/usr/share/pear') in /home/xxx/yyy/vendor/autoload.php on line 5

Warning: require(/home/x/y/vendor/composer/../magento/services-connector/registration.php): failed to open stream: No such file or directory in /home/x/y/vendor/composer/autoload_real.php on line 70

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Update: I set permissions, but it still does not work:

find . -type f -exec chmod 664 {} \;
find . -type d -exec chmod 775 {} \;
find var generated vendor pub/static pub/media app/etc -type f -exec chmod g+w {} +
find var generated vendor pub/static pub/media app/etc -type d -exec chmod g+ws {} +
chmod u+x bin/magento

Answer 1

I figured out that a new magento update is responsible for this mess.

$ composer update Loading composer repositories with package information Updating dependencies (including require-dev) Package operations: 0 installs, 3 updates, 0 removals

• Updating composer/composer (1.10.8 => 1.10.9): Loading from cache
• Updating magento/services-connector (1.0.5 => 1.0.6): Loading from cache

As you can see magento/services-connector received an update. This update removes the important file registration.php, for unknown reasons which then can't get loaded anymore:

Warning: require(/home/x/y/vendor/composer/../magento/services-connector/registration.php): failed to open stream: No such file or directory in /home/x/y/vendor/composer/autoload_real.php on line 70

Solution: Revert the update by using old version again until they have fixed it (check on github):

composer require magento/services-connector 1.0.5