仅半满时，Composer全盘错误

Question

This is my first time using composer. I am trying to build a project that uses it but I cannot get composer to function properly. For the command composer diagnose I get the following every time:

PS C:\WinNMP\WWW\Oro> composer diagnose
Checking composer.json: WARNING
Defining autoload.psr-4 with an empty namespace prefix is a bad idea for performance
License "Commercial" is not a valid SPDX license identifier, see https://spdx.org/licenses/ if you use an open license.
If the software is closed-source, you may use "proprietary" as license.
Checking platform settings: OK
Checking git settings: OK
Checking http connectivity to packagist: OK
Checking https connectivity to packagist: OK
Checking github.com oauth access: OK
Checking disk free space: FAIL
The disk hosting C:/Users/Mark/AppData/Roaming/Composer is full

All other tests return OK. My disk has 64gb free. I tried searching for this issue but found little help. I upped the memory limit in php to 512mb as a shot in the dark without effect. Some posts related to this suggested it was out of memory but my ram never goes above 35% usage.

I tried running composer clear-cache without any effect.

Trying to run this on php 7.2.6, composer 1.6.5

Answer 1

The function that triggers this error message is this:

private function checkDiskSpace($config)
{
    $minSpaceFree = 1024 * 1024;
    if ((($df = @disk_free_space($dir = $config->get('home'))) !== false && $df < $minSpaceFree)
        || (($df = @disk_free_space($dir = $config->get('vendor-dir'))) !== false && $df < $minSpaceFree)
    ) {
        return '<error>The disk hosting '.$dir.' is full</error>';
    }

    return true;
}

You may want to write a little script that makes the same check, except that without error suppression. To get the values for homeand vendor-dir you can run these commands:

composer config home
composer config vendor-dir

A rough idea:

$home = trim(`composer config home`);
$vendorDir = trim(`composer config vendor-dir`);

var_dump($home, disk_free_space($home));
var_dump($vendorDir, disk_free_space($vendorDir));

Don't forget to make sure that you have full error reporting enabled.