From 9807d6823b31f36eb6b255cf7a01431e7e44a74e Mon Sep 17 00:00:00 2001
From: lassulus <lassulus@lassul.us>
Date: Tue, 20 Nov 2018 23:02:17 +0100
Subject: l blue-host: sync state, start only when safe

---
 lass/2configs/blue-host.nix | 74 ++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 66 insertions(+), 8 deletions(-)

diff --git a/lass/2configs/blue-host.nix b/lass/2configs/blue-host.nix
index 2302c70ec..be9f68c08 100644
--- a/lass/2configs/blue-host.nix
+++ b/lass/2configs/blue-host.nix
@@ -1,11 +1,28 @@
 { config, lib, pkgs, ... }:
 with import <stockholm/lib>;
+let
+  all_hosts = [
+    "icarus"
+    "shodan"
+    "daedalus"
+    "skynet"
+    "prism"
+  ];
+  remote_hosts = filter (h: h != config.networking.hostName) all_hosts;
 
-{
+in {
   imports = [
     <stockholm/lass/2configs/container-networking.nix>
+    { #hack for already defined
+      systemd.services."container@blue".reloadIfChanged = mkForce false;
+      systemd.services."container@blue".preStart = ''
+        ${pkgs.mount}/bin/mount | ${pkgs.gnugrep}/bin/grep -q '^encfs on /var/lib/containers/blue'
+      '';
+      systemd.services."container@blue".preStop = ''
+        /run/wrappers/bin/fusermount -u /var/lib/containers/blue
+      '';
+    }
   ];
-  systemd.services."container@blue".reloadIfChanged = mkForce false;
   containers.blue = {
     config = { ... }: {
       environment.systemPackages = [
@@ -23,10 +40,56 @@ with import <stockholm/lib>;
     hostAddress = "10.233.2.9";
     localAddress = "10.233.2.10";
   };
+
+
+  systemd.services = builtins.listToAttrs (map (host:
+    let
+    in nameValuePair "sync-blue-${host}" {
+    bindsTo = [ "container@blue.service" ];
+    wantedBy = [ "container@blue.service" ];
+    # ssh needed for rsync
+    path = [ pkgs.openssh ];
+    serviceConfig = {
+      Restart = "always";
+      RestartSec = 10;
+      ExecStart = pkgs.writeDash "sync-blue-${host}" ''
+        set -efu
+        #make sure blue is running
+        /run/wrappers/bin/ping -c1 blue.r > /dev/null
+
+        #make sure the container is unlocked
+        ${pkgs.mount}/bin/mount | ${pkgs.gnugrep}/bin/grep -q '^encfs on /var/lib/containers/blue'
+
+        #make sure our target is reachable
+        ${pkgs.untilport}/bin/untilport ${host}.r 22 2>/dev/null
+
+        #start sync
+        ${pkgs.lsyncd}/bin/lsyncd -log scarce ${pkgs.writeText "lsyncd-config.lua" ''
+          settings {
+            nodaemon = true,
+            inotifyMode = "CloseWrite or Modify",
+          }
+          sync {
+            default.rsyncssh,
+            source = "/var/lib/containers/.blue",
+            host = "${host}.r",
+            targetdir = "/var/lib/containers/.blue",
+            ssh = {
+              binary = "${pkgs.openssh}/bin/ssh";
+              identityFile = "/var/lib/containers/blue/home/lass/.ssh/id_rsa",
+            },
+          }
+        ''}
+      '';
+    };
+    unitConfig.ConditionPathExists = "!/var/run/ppp0.pid";
+    }
+  ) remote_hosts);
+
   environment.systemPackages = [
     (pkgs.writeDashBin "start-blue" ''
       set -ef
-      if ping -c1 blue.r; then
+      if ping -c1 blue.r >/dev/null; then
         echo 'blue is already running. bailing out'
         exit 23
       fi
@@ -36,10 +99,5 @@ with import <stockholm/lib>;
       nixos-container start blue
       nixos-container run blue -- nixos-rebuild -I /var/src switch
     '')
-    (pkgs.writeDashBin "stop-blue" ''
-      set -ef
-      nixos-container stop blue
-      fusermount -u /var/lib/containers/blue
-    '')
   ];
 }
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