uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

nixos/tests/printing.nix

@@ -0,0 +1,128 @@
+# Test printing via CUPS.
+
+import ./make-test-python.nix ({pkgs, ... }:
+let
+  printingServer = startWhenNeeded: {
+    services.printing.enable = true;
+    services.printing.startWhenNeeded = startWhenNeeded;
+    services.printing.listenAddresses = [ "*:631" ];
+    services.printing.defaultShared = true;
+    services.printing.extraConf = ''
+      <Location />
+        Order allow,deny
+        Allow from all
+      </Location>
+    '';
+    networking.firewall.allowedTCPPorts = [ 631 ];
+    # Add a HP Deskjet printer connected via USB to the server.
+    hardware.printers.ensurePrinters = [{
+      name = "DeskjetLocal";
+      deviceUri = "usb://foobar/printers/foobar";
+      model = "drv:///sample.drv/deskjet.ppd";
+    }];
+  };
+  printingClient = startWhenNeeded: {
+    services.printing.enable = true;
+    services.printing.startWhenNeeded = startWhenNeeded;
+    # Add printer to the client as well, via IPP.
+    hardware.printers.ensurePrinters = [{
+      name = "DeskjetRemote";
+      deviceUri = "ipp://${if startWhenNeeded then "socketActivatedServer" else "serviceServer"}/printers/DeskjetLocal";
+      model = "drv:///sample.drv/deskjet.ppd";
+    }];
+    hardware.printers.ensureDefaultPrinter = "DeskjetRemote";
+  };
+
+in {
+  name = "printing";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ domenkozar eelco matthewbauer ];
+  };
+
+  nodes = {
+    socketActivatedServer = { ... }: (printingServer true);
+    serviceServer = { ... }: (printingServer false);
+
+    socketActivatedClient = { ... }: (printingClient true);
+    serviceClient = { ... }: (printingClient false);
+  };
+
+  testScript = ''
+    import os
+    import re
+
+    start_all()
+
+    with subtest("Make sure that cups is up on both sides and printers are set up"):
+        serviceServer.wait_for_unit("cups.service")
+        serviceClient.wait_for_unit("cups.service")
+        socketActivatedClient.wait_for_unit("ensure-printers.service")
+
+
+    def test_printing(client, server):
+        assert "scheduler is running" in client.succeed("lpstat -r")
+
+        with subtest("UNIX socket is used for connections"):
+            assert "/var/run/cups/cups.sock" in client.succeed("lpstat -H")
+        with subtest("HTTP server is available too"):
+            client.succeed("curl --fail http://localhost:631/")
+            client.succeed(f"curl --fail http://{server.name}:631/")
+            server.fail(f"curl --fail --connect-timeout 2 http://{client.name}:631/")
+
+        with subtest("LP status checks"):
+            assert "DeskjetRemote accepting requests" in client.succeed("lpstat -a")
+            assert "DeskjetLocal accepting requests" in client.succeed(
+                f"lpstat -h {server.name}:631 -a"
+            )
+            client.succeed("cupsdisable DeskjetRemote")
+            out = client.succeed("lpq")
+            print(out)
+            assert re.search(
+                "DeskjetRemote is not ready.*no entries",
+                client.succeed("lpq"),
+                flags=re.DOTALL,
+            )
+            client.succeed("cupsenable DeskjetRemote")
+            assert re.match(
+                "DeskjetRemote is ready.*no entries", client.succeed("lpq"), flags=re.DOTALL
+            )
+
+        # Test printing various file types.
+        for file in [
+            "${pkgs.groff.doc}/share/doc/*/examples/mom/penguin.pdf",
+            "${pkgs.groff.doc}/share/doc/*/meref.ps",
+            "${pkgs.cups.out}/share/doc/cups/images/cups.png",
+            "${pkgs.pcre.doc}/share/doc/pcre/pcre.txt",
+        ]:
+            file_name = os.path.basename(file)
+            with subtest(f"print {file_name}"):
+                # Print the file on the client.
+                print(client.succeed("lpq"))
+                client.succeed(f"lp {file}")
+                client.wait_until_succeeds(
+                    f"lpq; lpq | grep -q -E 'active.*root.*{file_name}'"
+                )
+
+                # Ensure that a raw PCL file appeared in the server's queue
+                # (showing that the right filters have been applied).  Of
+                # course, since there is no actual USB printer attached, the
+                # file will stay in the queue forever.
+                server.wait_for_file("/var/spool/cups/d*-001")
+                server.wait_until_succeeds(f"lpq -a | grep -q -E '{file_name}'")
+
+                # Delete the job on the client.  It should disappear on the
+                # server as well.
+                client.succeed("lprm")
+                client.wait_until_succeeds("lpq -a | grep -q -E 'no entries'")
+
+                retry(lambda _: "no entries" in server.succeed("lpq -a"))
+
+                # The queue is empty already, so this should be safe.
+                # Otherwise, pairs of "c*"-"d*-001" files might persist.
+                server.execute("rm /var/spool/cups/*")
+
+
+    test_printing(serviceClient, serviceServer)
+    test_printing(socketActivatedClient, socketActivatedServer)
+  '';
+})