Use a bash script to add ssh key.

Instead of using cloud-init a bash script removes more variables
from the equation.

ipa/ipa_constants.py

@@ -41,11 +41,8 @@
 IPA_HISTORY_FILE = os.path.join(HOME, '.config', 'ipa', '.history')
 IPA_RESULTS_PATH = os.path.join(HOME, 'ipa', 'results')
 
-CLOUD_INIT_CONFIG = '''#cloud-config
-users:
-  - name: {user}
-    ssh-authorized-keys:
-      - {key}
+BASH_SSH_SCRIPT = '''#!/bin/bash
+echo {key} >> /home/{user}/.ssh/authorized_keys
 '''
 
 SYNC_POINTS = (

ipa/ipa_ec2.py

@@ -22,7 +22,7 @@
 
 from ipa import ipa_utils
 from ipa.ipa_constants import (
-    CLOUD_INIT_CONFIG,
+    BASH_SSH_SCRIPT,
     EC2_CONFIG_FILE,
     EC2_DEFAULT_TYPE,
     EC2_DEFAULT_USER
@@ -238,7 +238,7 @@ def _get_user_data(self):
         the ssh user and private key file.
         """
         key = ipa_utils.generate_public_ssh_key(self.ssh_private_key).decode()
-        data = CLOUD_INIT_CONFIG.format(user=self.ssh_user, key=key)
+        data = BASH_SSH_SCRIPT.format(user=self.ssh_user, key=key)
         return data
 
     def _launch_instance(self):

tests/test_ipa_ec2.py

@@ -140,8 +140,8 @@ def test_ec2_get_user_data(self, mock_generate_ssh_key):
 
         result = provider._get_user_data()
 
-        assert result == '#cloud-config\nusers:\n  - name: ec2-user\n    ' \
-            'ssh-authorized-keys:\n      - testkey12345\n'
+        assert result == '#!/bin/bash\n' \
+            'echo testkey12345 >> /home/ec2-user/.ssh/authorized_keys\n'
 
     @patch.object(EC2Provider, '_get_user_data')
     @patch.object(EC2Provider, '_get_subnet')