fix(configtree): prefix keys with '/' when importing to etcd

riocli/configtree/etcd.py

@@ -12,12 +12,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from typing import Optional
 from base64 import b64encode
+from typing import Optional
+
 from etcd3gw import Etcd3Client
 
 
-def import_in_etcd(data: dict, endpoint: str, port: Optional[int] = None, prefix: Optional[str] = None) -> None:
+def import_in_etcd(
+        data: dict,
+        endpoint: str,
+        port: Optional[int] = None,
+        prefix: Optional[str] = None,
+) -> None:
     if port is None:
         port = 2379
 
@@ -33,6 +39,8 @@ def import_in_etcd(data: dict, endpoint: str, port: Optional[int] = None, prefix
     for key, val in data.items():
         if prefix:
             key = '{}/{}'.format(prefix, key)
+        elif not key.startswith('/'):
+            key = '/{}'.format(key)
 
         enc_key = b64encode(str(key).encode('utf-8')).decode()
         enc_val = b64encode(str(val).encode('utf-8')).decode()
@@ -56,8 +64,9 @@ def import_in_etcd(data: dict, endpoint: str, port: Optional[int] = None, prefix
 
     cli.transaction(txn)
 
+
 def _delete_all_keys(client: Etcd3Client) -> None:
     null_char = '\x00'
-    enc_null  = b64encode(null_char.encode('utf-8')).decode()
+    enc_null = b64encode(null_char.encode('utf-8')).decode()
 
     client.delete('\x00', range_end=enc_null)