1 files changed, 94 insertions, 0 deletions
diff --git a/nixpkgs/nixos/tests/nfs/simple.nix b/nixpkgs/nixos/tests/nfs/simple.nix
new file mode 100644
index 000000000000..a1a09ee0f45c
--- /dev/null
+++ b/nixpkgs/nixos/tests/nfs/simple.nix
@@ -0,0 +1,94 @@
+import ../make-test-python.nix ({ pkgs, version ? 4, ... }:
+
+let
+
+  client =
+    { pkgs, ... }:
+    { fileSystems = pkgs.lib.mkVMOverride
+        [ { mountPoint = "/data";
+            # nfs4 exports the export with fsid=0 as a virtual root directory
+            device = if (version == 4) then "server:/" else "server:/data";
+            fsType = "nfs";
+            options = [ "vers=${toString version}" ];
+          }
+        ];
+      networking.firewall.enable = false; # FIXME: only open statd
+    };
+
+in
+
+{
+  name = "nfs";
+  meta = with pkgs.stdenv.lib.maintainers; {
+    maintainers = [ eelco ];
+  };
+
+  nodes =
+    { client1 = client;
+      client2 = client;
+
+      server =
+        { ... }:
+        { services.nfs.server.enable = true;
+          services.nfs.server.exports =
+            ''
+              /data 192.168.1.0/255.255.255.0(rw,no_root_squash,no_subtree_check,fsid=0)
+            '';
+          services.nfs.server.createMountPoints = true;
+          networking.firewall.enable = false; # FIXME: figure out what ports need to be allowed
+        };
+    };
+
+  testScript =
+    ''
+      import time
+
+      server.wait_for_unit("nfs-server")
+      server.succeed("systemctl start network-online.target")
+      server.wait_for_unit("network-online.target")
+
+      start_all()
+
+      client1.wait_for_unit("data.mount")
+      client1.succeed("echo bla > /data/foo")
+      server.succeed("test -e /data/foo")
+
+      client2.wait_for_unit("data.mount")
+      client2.succeed("echo bla > /data/bar")
+      server.succeed("test -e /data/bar")
+
+      with subtest("restarting 'nfs-server' works correctly"):
+          server.succeed("systemctl restart nfs-server")
+          # will take 90 seconds due to the NFS grace period
+          client2.succeed("echo bla >> /data/bar")
+
+      with subtest("can get a lock"):
+          client2.succeed("time flock -n -s /data/lock true")
+
+      with subtest("client 2 fails to acquire lock held by client 1"):
+          client1.succeed("flock -x /data/lock -c 'touch locked; sleep 100000' &")
+          client1.wait_for_file("locked")
+          client2.fail("flock -n -s /data/lock true")
+
+      with subtest("client 2 obtains lock after resetting client 1"):
+          client2.succeed(
+              "flock -x /data/lock -c 'echo acquired; touch locked; sleep 100000' >&2 &"
+          )
+          client1.crash()
+          client1.start()
+          client2.wait_for_file("locked")
+
+      with subtest("locks survive server reboot"):
+          client1.wait_for_unit("data.mount")
+          server.shutdown()
+          server.start()
+          client1.succeed("touch /data/xyzzy")
+          client1.fail("time flock -n -s /data/lock true")
+
+      with subtest("unmounting during shutdown happens quickly"):
+          t1 = time.monotonic()
+          client1.shutdown()
+          duration = time.monotonic() - t1
+          assert duration < 30, f"shutdown took too long ({duration} seconds)"
+    '';
+})