Store vcs repositories in composer home to prevent permission issues

src/Composer/Repository/Vcs/GitDriver.php

@@ -36,7 +36,7 @@ class GitDriver extends VcsDriver
         if (static::isLocalUrl($this->url)) {
             $this->repoDir = str_replace('file://', '', $this->url);
         } else {
-            $this->repoDir = getenv('HOME') . '/.composer/cache.git/' . preg_replace('{[^a-z0-9.]}i', '-', $this->url) . '/';
+            $this->repoDir = $this->config->get('home') . '/cache.git/' . preg_replace('{[^a-z0-9.]}i', '-', $this->url) . '/';
 
             // update the repo if it is a valid git repository
             if (is_dir($this->repoDir) && 0 === $this->process->execute('git remote', $output, $this->repoDir)) {

src/Composer/Repository/Vcs/HgDriver.php

@@ -31,14 +31,14 @@ class HgDriver extends VcsDriver
      */
     public function initialize()
     {
-        $this->tmpDir = sys_get_temp_dir() . '/composer-' . preg_replace('{[^a-z0-9]}i', '-', $url) . '/';
+        $this->tmpDir = $this->config->get('home') . '/cache.hg/' . preg_replace('{[^a-z0-9]}i', '-', $url) . '/';
 
         $url = escapeshellarg($this->url);
         $tmpDir = escapeshellarg($this->tmpDir);
         if (is_dir($this->tmpDir)) {
             $this->process->execute(sprintf('cd %s && hg pull -u', $tmpDir), $output);
         } else {
-            $this->process->execute(sprintf('cd %s && hg clone %s %s', escapeshellarg(sys_get_temp_dir()), $url, $tmpDir), $output);
+            $this->process->execute(sprintf('cd %s && hg clone %s %s', escapeshellarg(dirname($this->tmpDir)), $url, $tmpDir), $output);
         }
 
         $this->getTags();