--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wireguard.py	Wed Nov 10 09:51:54 2021 -0800
@@ -0,0 +1,59 @@
+import subprocess
+
+from pyinfra import host
+from pyinfra.facts.files import FindInFile
+from pyinfra.operations import apt, files, systemd
+
+# other options:
+#   https://www.reddit.com/r/WireGuard/comments/fkr240/shortest_path_between_peers/
+#   https://github.com/k4yt3x/wireguard-mesh-configurator
+#   https://github.com/mawalu/wireguard-private-networking
+#
+
+
+def peer_block(hostname, public_key, allowed_ips, endpoint=None, keepalive=None):
+    out = f'''\
+
+[Peer]
+# {hostname}
+PublicKey = {public_key}
+AllowedIPs = {allowed_ips}
+'''
+    if endpoint is not None:
+        out += f'Endpoint = {endpoint}\n'
+    if keepalive is not None:
+        out += f'PersistentKeepalive = {keepalive}\n'
+    return out
+
+
+for wireguard_interface in ['wg0', 'bogasterisk']:
+    if wireguard_interface == 'bogasterisk' and host.name != 'prime':
+        continue
+
+    # note- this is specific to the wg0 setup. Other conf files don't use it.
+    wireguard_ip = host.host_data['wireguard_address']
+
+    apt.packages(packages=['wireguard'])
+    # new pi may fail with 'Unable to access interface: Protocol not supported'. reboot fixes.
+
+    priv_key_lines = host.get_fact(FindInFile, path=f'/etc/wireguard/{wireguard_interface}.conf', pattern=r'PrivateKey.*')
+    if not priv_key_lines:
+        priv_key = subprocess.check_output(['wg', 'genkey']).strip().decode('ascii')
+    else:
+        priv_key = priv_key_lines[0].split(' = ')[1]
+
+    pub_key = subprocess.check_output(['wg', 'pubkey'], input=priv_key.encode('ascii')).strip().decode('ascii')
+    # todo: if this was new, it should be added to a file of pubkeys that peer_block can refer to
+
+    files.template(
+        src=f'templates/wireguard_{wireguard_interface}.conf.j2',
+        dest=f'/etc/wireguard/{wireguard_interface}.conf',
+        mode='600',
+        wireguard_ip=wireguard_ip,
+        priv_key=priv_key,
+        peer_block=peer_block,
+    )
+    svc = f'wg-quick@{wireguard_interface}.service'
+    files.link(path=f'/etc/systemd/system/multi-user.target.wants/{svc}', target='/lib/systemd/system/wg-quick@.service')
+
+    systemd.service(service=svc, daemon_reload=True, running=True, enabled=True)