Do not fetch branches, perform instead a single git clone

src/DrupalArtifactBuilderGit.php

@@ -67,19 +67,26 @@ protected function gitSetup() {
     // This is done after creating the artifact and not before
     // so there are no residual files, plus giving more options
     // to create artifacts than pushing the changes to a git repository (s.e.: generating a .tar.gz.).
-    $this->runCommand(sprintf('git clone --depth 1 %s %s', $this->getConfiguration()->getRepository(), self::ARTIFACT_REPOSITORY_FOLDER));
 
-    // Checkout to the branch (create if new):
-    chdir(self::ARTIFACT_REPOSITORY_FOLDER);
     $branch = $this->getConfiguration()->getBranch();
-    $ls_remote = $this->runCommand(sprintf('git ls-remote --heads origin %s', $branch));
+    $ls_remote = $this->runCommand(sprintf('git ls-remote --heads %s %s', $this->getConfiguration()->getRepository(), $branch));
     $ls_remote_output = trim($ls_remote->getOutput());
     $branch_exists = !empty($ls_remote_output);
-    if ($branch_exists) {
-      $this->runCommand(sprintf('git fetch --depth 1 origin %s', $branch));
+
+    $this->runCommand(sprintf(
+      'git clone  %s %s --depth 1 %s',
+        $this->getConfiguration()->getRepository(),
+      $branch_exists ? sprintf('--branch %s', $branch) : '',
+      self::ARTIFACT_REPOSITORY_FOLDER)
+    );
+
+    chdir(self::ARTIFACT_REPOSITORY_FOLDER);
+
+    // Checkout to new branch only when branch does not exists.
+    if (!$branch_exists) {
+      $this->runCommand(sprintf('git checkout -b %s', $this->getConfiguration()->getBranch()));
     }
 
-    $this->runCommand(sprintf('git checkout %s %s', !$branch_exists ? '-b': '', $this->getConfiguration()->getBranch()));
     chdir($this->rootFolder);
 
     $this->runCommand(sprintf('cp -r %s/.git %s', self::ARTIFACT_REPOSITORY_FOLDER, SELF::ARTIFACT_FOLDER));