backup: minor fixes

The ssh config file is /.ssh/config (not ssh_config)

We are accepting the ed25519 key, not the ecdsa key, so fix that in
the known_hosts stanza.

Change-Id: If3a42a7872f5d5e7a2bf9c3b5184fb14d43e6a1a

playbooks/roles/backup/tasks/main.yaml

@@ -24,7 +24,7 @@
 
 - name: Configure ssh for backup server
   blockinfile:
-    path: /root/.ssh/ssh_config
+    path: /root/.ssh/config
     create: true
     block: |
       Host {{ item }}
@@ -41,7 +41,7 @@
 - name: Accept hostkey of backup server
   known_hosts:
     state: present
-    key: '{{ item }} ecdsa-sha2-nistp256 {{ hostvars[item]["ansible_ssh_host_key_ed25519_public"] }}'
+    key: '{{ item }} ssh-ed25519 {{ hostvars[item]["ansible_ssh_host_key_ed25519_public"] }}'
     name: '{{ item }}'
   with_inventory_hostnames: backup-server
 

testinfra/test_backups.py

@@ -53,7 +53,7 @@ def test_backup_host_config(host):
     f = host.file('/root/.ssh/id_backup_ed25519')
     assert f.exists
 
-    f = host.file('/root/.ssh/ssh_config')
+    f = host.file('/root/.ssh/config')
     assert f.exists
     assert f.contains('Host backup01.region.provider.opendev.org')