From 776e8768767e266ac84f389734e64d67c93e4c98 Mon Sep 17 00:00:00 2001
From: mwiegand <mwiegand@seibert-media.net>
Date: Wed, 10 Nov 2021 02:43:45 +0100
Subject: [PATCH] swapfile

---
 bundles/systemd-swap/items.py    | 50 ++++++++++++++++++++++++++++++++
 bundles/systemd-swap/metadata.py | 14 +++++++++
 bundles/systemd/items.py         |  2 +-
 bundles/systemd/metadata.py      |  4 +--
 nodes/home.openhab.py            |  9 +-----
 5 files changed, 68 insertions(+), 11 deletions(-)
 create mode 100644 bundles/systemd-swap/items.py
 create mode 100644 bundles/systemd-swap/metadata.py

diff --git a/bundles/systemd-swap/items.py b/bundles/systemd-swap/items.py
new file mode 100644
index 0000000..f23886f
--- /dev/null
+++ b/bundles/systemd-swap/items.py
@@ -0,0 +1,50 @@
+size = node.metadata.get('systemd-swap/size')
+assert isinstance(size, int)
+
+actions = {
+    'stop_swap': {
+        'command': f'systemctl stop swapfile.swap',
+        'unless': f'rm /swapfile',
+        'triggered': True,
+    },
+    'create_swapfile': {
+        'command': f'dd if=/dev/zero of=/swapfile bs={size} count=1',
+        'unless': f'stat -c %s /swapfile | grep ^{size}$',
+        'preceded_by': {
+            'action:stop_swap',
+        },
+        'triggers': {
+            'action:initialize_swapfile',
+            'svc_systemd:swapfile.swap:restart',
+        },
+    },
+    'initialize_swapfile': {
+        'command': f'mkswap /swapfile',
+        'triggered': True,
+        'needs': {
+            'action:create_swapfile',
+        }
+    },
+}
+
+files = {
+    '/swapfile': {
+        'content_type': 'any', 
+        'mode': '600',
+        'triggers': {
+            'svc_systemd:swapfile.swap:restart',
+        },
+    }
+}
+
+svc_systemd = {
+    'swapfile.swap': {
+        'preceded_by': {
+            'action:initialize_swapfile',
+        },
+        'needs': {
+            'action:systemd-reload',
+            'action:create_swapfile',
+        },
+    },
+}
diff --git a/bundles/systemd-swap/metadata.py b/bundles/systemd-swap/metadata.py
new file mode 100644
index 0000000..1b2c143
--- /dev/null
+++ b/bundles/systemd-swap/metadata.py
@@ -0,0 +1,14 @@
+defaults = {
+    'systemd-swap': {
+        'size': 2*10**9,
+    },
+    'systemd': {
+        'units': {
+            'swapfile.swap': {
+                'Swap': {
+                    'What': '/swapfile',
+                },
+            },
+        },
+    },
+}
diff --git a/bundles/systemd/items.py b/bundles/systemd/items.py
index c7fab56..e28a2b5 100644
--- a/bundles/systemd/items.py
+++ b/bundles/systemd/items.py
@@ -18,7 +18,7 @@ for name, unit in node.metadata.get('systemd/units').items():
                 'svc_systemd:systemd-networkd:restart',
             ],
         }
-    elif extension in ['timer', 'service', 'mount']:
+    elif extension in ['timer', 'service', 'mount', 'swap']:
         path = f'/etc/systemd/system/{name}'
         dependencies = {
             'triggers': [
diff --git a/bundles/systemd/metadata.py b/bundles/systemd/metadata.py
index d8fb272..617c2cd 100644
--- a/bundles/systemd/metadata.py
+++ b/bundles/systemd/metadata.py
@@ -14,7 +14,7 @@ def units(metadata):
     for name, config in metadata.get('systemd/units').items():
         extension = name.split('.')[-1]
 
-        if extension not in ['timer', 'service', 'network', 'netdev', 'mount']:
+        if extension not in ['timer', 'service', 'network', 'netdev', 'mount', 'swap']:
             raise Exception(f'unknown extension {extension}')
 
         if not config.get('Install/WantedBy'):
@@ -47,7 +47,7 @@ def services(metadata):
     for name, config in metadata.get('systemd/services').items():
         extension = name.split('.')[-1]
         
-        if extension not in ['timer', 'service', 'mount']:
+        if extension not in ['timer', 'service', 'mount', 'swap']:
             raise Exception(f'unknown extension: {extension}')
 
     return {
diff --git a/nodes/home.openhab.py b/nodes/home.openhab.py
index e339ad3..27df6d7 100644
--- a/nodes/home.openhab.py
+++ b/nodes/home.openhab.py
@@ -10,17 +10,10 @@
         'zfs',
         'openhab',
         'java',
+        'systemd-swap',
     ],
     'metadata': {
         'FIXME_dont_touch_sshd': True,
-        'telegraf': {
-            'config': {
-                'agent': {
-                    'flush_interval': '30s',
-                    'interval': '30s',
-                },
-            },
-        },
         'id': '0afcde75-95c8-4fbd-b4c2-8a0fcc92884a',
         'network': {
             'internal': {