title: Composer: The disk hosting /home/user/.composer is full, this may be the cause of the following exception
body: <p>I'm deploying a small Symfony 4 application on a shared hosting.
  I have SSH access.</p>
  
  <p>When I run composer update, I get an error like this:</p>
  
  <pre><code>$ composer update --no-dev
  Loading composer repositories with package information
  Updating dependencies
  Generating autoload files
  ocramius/package-versions:  Generating version class...
  ocramius/package-versions: ...done generating version class
  The disk hosting /home/user/.composer is full, this may be the cause of the following exception
  
  
  [ErrorException]
  escapeshellarg() has been disabled for security reasons  
  </code></pre>
  
  <p>Same thing happens when performing a diagnose:</p>
  
  <pre><code>$ composer diagnose
  Checking composer.json: OK
  Checking platform settings: OK
  Checking git settings: The disk hosting /home/user/.composer is full, this may be the cause of the following exception
  </code></pre>
  
  <p>I already cleared the cache, but that didn't change anything:</p>
  
  <pre><code>$ composer clearcache
  Cache directory does not exist (cache-vcs-dir): 
  Clearing cache (cache-repo-dir): /home/user/.composer/cache/repo
  Clearing cache (cache-files-dir): /home/user/.composer/cache/files
  Clearing cache (cache-dir): /home/user/.composer/cache
  All caches cleared.
  </code></pre>
  
  <p>I have a quota of 1GB and for the moment I'm not using 200MB, so there is still some space left. When the error rises, the cache folder is around 89MB.</p>
  
  <p>Does anyone have had this issue or know how to solve this? 
  I'm also looking at this with the people of my hosting company (who are really trying their best!)...</p>