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/mysql/mysql-backup.nix

@@ -0,0 +1,71 @@
+{
+  system ? builtins.currentSystem,
+  config ? {},
+  pkgs ? import ../../.. { inherit system config; },
+  lib ? pkgs.lib
+}:
+
+let
+  inherit (import ./common.nix { inherit pkgs lib; }) mkTestName mariadbPackages;
+
+  makeTest = import ./../make-test-python.nix;
+
+  makeBackupTest = {
+    package,
+    name ? mkTestName package
+  }: makeTest {
+    name = "${name}-backup";
+    meta = with pkgs.lib.maintainers; {
+      maintainers = [ rvl ];
+    };
+
+    nodes = {
+      master = { pkgs, ... }: {
+        services.mysql = {
+          inherit package;
+          enable = true;
+          initialDatabases = [ { name = "testdb"; schema = ./testdb.sql; } ];
+        };
+
+        services.mysqlBackup = {
+          enable = true;
+          databases = [ "doesnotexist" "testdb" ];
+        };
+      };
+    };
+
+    testScript = ''
+      start_all()
+
+      # Delete backup file that may be left over from a previous test run.
+      # This is not needed on Hydra but useful for repeated local test runs.
+      master.execute("rm -f /var/backup/mysql/testdb.gz")
+
+      # Need to have mysql started so that it can be populated with data.
+      master.wait_for_unit("mysql.service")
+
+      # Wait for testdb to be fully populated (5 rows).
+      master.wait_until_succeeds(
+          "mysql -u root -D testdb -N -B -e 'select count(id) from tests' | grep -q 5"
+      )
+
+      # Do a backup and wait for it to start
+      master.start_job("mysql-backup.service")
+
+      # wait for backup to fail, because of database 'doesnotexist'
+      master.wait_until_fails("systemctl is-active -q mysql-backup.service")
+
+      # wait for backup file and check that data appears in backup
+      master.wait_for_file("/var/backup/mysql/testdb.gz")
+      master.succeed(
+          "${pkgs.gzip}/bin/zcat /var/backup/mysql/testdb.gz | grep hello"
+      )
+
+      # Check that a failed backup is logged
+      master.succeed(
+          "journalctl -u mysql-backup.service | grep 'fail.*doesnotexist' > /dev/null"
+      )
+    '';
+  };
+in
+  lib.mapAttrs (_: package: makeBackupTest { inherit package; }) mariadbPackages