dont multiplex to sleepers

bundles/ssh/files/ssh_config

@@ -4,7 +4,8 @@ Host *
     GSSAPIAuthentication yes
     StrictHostKeyChecking yes
     GlobalKnownHostsFile /etc/ssh/ssh_known_hosts
-    # fixme: prevents backup server from sleeping
-    # ControlMaster auto
-    # ControlPath ~/.ssh/multiplex-%C
-    # ControlPersist 5m
+
+Host ${' '.join(sorted(multiplex_hosts))}
+    ControlMaster auto
+    ControlPath ~/.ssh/multiplex-%C
+    ControlPersist 5m

bundles/ssh/items.py

@@ -1,3 +1,6 @@
+from ipaddress import ip_interface
+
+
 # on debian bullseye raspberry images, starting the systemd ssh
 # daemon seems to collide with an existing sysv daemon
 dont_touch_sshd = node.metadata.get('FIXME_dont_touch_sshd', False)
@@ -24,6 +27,13 @@ files = {
     '/etc/ssh/ssh_config': {
         'content_type': 'mako',
         'context': {
+            'multiplex_hosts': set(
+                str(ip_interface(other_node.metadata.get('network/internal/ipv4')).ip)
+                    for other_node in repo.nodes
+                    if other_node.has_bundle('ssh')
+                    and other_node.metadata.get('network/internal/ipv4', None)
+                    and other_node.metadata.get('ssh/multiplex_incoming')
+            ),
         },
         'triggers': [
             'svc_systemd:ssh:restart'

bundles/ssh/metadata.py

@@ -1,6 +1,12 @@
 from ipaddress import ip_interface
 from base64 import b64decode
 
+defaults = {
+    'ssh': {
+        'multiplex_incoming': True,
+    },
+}
+
 
 @metadata_reactor.provides(
     'ssh/allow_users',

nodes/home.backups.py

@@ -38,6 +38,10 @@
         #         'apm': 1,
         #     },
         # },
+        'ssh': {
+            # multipling prevents server from sleeping
+            'multiplex_incoming': False,
+        },
         'wol-sleeper': {
             'network': 'internal',
             'waker': 'home.server',