composer.json: change the vendor-dir dynamically through a script - composer-php

Question

In a project using Composer, shared by many developers and environments, I need to have the vendor-dir config parameter of composer.json to be set dynamically. That is, a script that runs when composer install/update is launched, must be able to change the value of this entry:
//composer.json
"config": {
"vendor-dir": "/var/www/html/......",
I tried the following:
//composer.json
"scripts": {
"pre-install-cmd": "MyBundle\\Composer\\Hook::setVendorDir",
The class Hook has this method:
//MyBundle/Composer/Hook.php
public static function setVendorDir(Event $event)
{
// ... some code set the $vendorDir variable here depending on many thing
$event->getComposer()->getConfig()->merge([
'config' => [
'vendor-dir' => $vendorDir
]
]);
// ...
}
The result is that the file autoloader.php and a composer folder are created in the right vendor directory, but all other packages are still installed in the default vendor directory!
The composer folder I mentioned only contains some PHP files (ClassLoader.php, _autoload\_*.php_, and LICENSE)
Notice: When I change the vendor-dir parameter in composer.json, it works flawlessly.
How may I set vendor-dir dynamically and have it taken into account for every package installations?

Answer 1

You can e.g. write a batch script (Windows) or bash script (Linux) or even a PHP script which you run instead of composer install. The script sets the correct vendor-dir in the composer.json and then runs composer install or whatever.
To set vendor dir just run in your script:
composer config vendor-dir /your/path/to/your/vendor/dir
For more info about composer config see the Composer documentation.