Also detect full temp dir, fixes #3559

src/Composer/Console/Application.php

@@ -184,6 +184,7 @@ class Application extends BaseApplication
                 $minSpaceFree = 1024*1024;
                 if ((($df = @disk_free_space($dir = $config->get('home'))) !== false && $df < $minSpaceFree)
                     || (($df = @disk_free_space($dir = $config->get('vendor-dir'))) !== false && $df < $minSpaceFree)
+                    || (($df = @disk_free_space($dir = sys_get_temp_dir())) !== false && $df < $minSpaceFree)
                 ) {
                     $output->writeln('<error>The disk hosting '.$dir.' is full, this may be the cause of the following exception</error>');
                 }