Don't clone CPython repo if it already exists (GH-33)

Author: Mariatta

backport/tasks.py

@@ -12,17 +12,19 @@
                 CELERY_RESULT_BACKEND=os.environ['REDIS_URL'])
 
 
-
 @app.task(rate_limit="1/m")
 def setup_cpython_repo():
-    subprocess.check_output(
-        f"git clone https://{os.environ.get('GH_AUTH')}:[email protected]/miss-islington/cpython.git".split())
-    subprocess.check_output("git config --global user.email '[email protected]'".split())
-    subprocess.check_output(["git", "config", "--global", "user.name", "'Miss Islington (bot)'"])
-    os.chdir('./cpython')
-    subprocess.check_output(
-        f"git remote add upstream https://{os.environ.get('GH_AUTH')}:[email protected]/python/cpython.git".split())
-    print("Finished setting up CPython Repo")
+    if "cpython" not in os.listdir('.'):
+        subprocess.check_output(
+            f"git clone https://{os.environ.get('GH_AUTH')}:[email protected]/miss-islington/cpython.git".split())
+        subprocess.check_output("git config --global user.email '[email protected]'".split())
+        subprocess.check_output(["git", "config", "--global", "user.name", "'Miss Islington (bot)'"])
+        os.chdir('./cpython')
+        subprocess.check_output(
+            f"git remote add upstream https://{os.environ.get('GH_AUTH')}:[email protected]/python/cpython.git".split())
+        print("Finished setting up CPython Repo")
+    else:
+        print("cpython directory already exists")
 
 
 @app.task(rate_limit="1/m")