Move common nix code one level up.

common/cifs-client.nix

@@ -0,0 +1,30 @@
+{ pkgs, ... }:
+{
+  environment.systemPackages = [ pkgs.cifs-utils ];
+
+  environment.etc."nixos/smb-secrets" = {
+    text = ''
+      username=compute
+      password=aaShecheseiwee5eeh2p
+    '';
+    mode = "0400";
+  };
+
+  fileSystems."/data/media" = {
+    device = "//fractal/media";
+    fsType = "cifs";
+    options = let
+      # this line prevents hanging on network split
+      automount_opts = "x-systemd.automount,noauto,x-systemd.idle-timeout=60,x-systemd.device-timeout=5s,x-systemd.mount-timeout=5s";
+    in ["${automount_opts},credentials=/etc/nixos/smb-secrets"];
+  };
+
+  fileSystems."/data/shared" = {
+    device = "//fractal/shared";
+    fsType = "cifs";
+    options = let
+      # this line prevents hanging on network split
+      automount_opts = "x-systemd.automount,noauto,x-systemd.idle-timeout=60,x-systemd.device-timeout=5s,x-systemd.mount-timeout=5s";
+    in ["${automount_opts},credentials=/etc/nixos/smb-secrets"];
+  };
+}