MAINT: add branch_exists

utils/branch_exists.py

+#!/usr/bin/env python3
+"""
+Exit with error code 2 if the branch does not exist.
+"""
+import sys
+import argparse
+import requests
+from ref_to_commit import get_remote
+
+
+def branch_exists(repository, branch):
+    remote = get_remote(repository)
+    resp = requests.get(remote+"/repository/branches/"+branch).json()
+    return "message" not in resp
+
+
+def define_parser():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("repository")
+    parser.add_argument("branchname")
+
+    return parser
+
+
+if __name__ == "__main__":
+    parser = define_parser()
+    args = parser.parse_args()
+    ret = branch_exists(repository=args.repository, branch=args.branchname)
+    if ret is False:
+        print("branch does not exist.")
+        sys.exit(2)
+    else:
+        print("branch exists.")
+