nixos/tests: add bpf test

test bcc and bpftrace briefly

nixos/tests/bpf.nix

@@ -0,0 +1,25 @@
+import ./make-test-python.nix ({ pkgs, ... }: {
+  name = "bpf";
+  meta.maintainers = with pkgs.lib.maintainers; [ martinetd ];
+
+  machine = { pkgs, ... }: {
+    programs.bcc.enable = true;
+    environment.systemPackages = with pkgs; [ bpftrace ];
+  };
+
+  testScript = ''
+    ## bcc
+    # syscount -d 1 stops 1s after probe started so is good for that
+    print(machine.succeed("syscount -d 1"))
+
+    ## bpftrace
+    # list probes
+    machine.succeed("bpftrace -l")
+    # simple BEGIN probe (user probe on bpftrace itself)
+    print(machine.succeed("bpftrace -e 'BEGIN { print(\"ok\"); exit(); }'"))
+    # tracepoint
+    print(machine.succeed("bpftrace -e 'tracepoint:syscalls:sys_enter_* { print(probe); exit(); }'"))
+    # kprobe
+    print(machine.succeed("bpftrace -e 'kprobe:schedule { print(probe); exit() }'"))
+  '';
+})