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/modules/virtualisation/azure-image.nix

@@ -0,0 +1,71 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+let
+  cfg = config.virtualisation.azureImage;
+in
+{
+  imports = [ ./azure-common.nix ];
+
+  options = {
+    virtualisation.azureImage.diskSize = mkOption {
+      type = with types; either (enum [ "auto" ]) int;
+      default = "auto";
+      example = 2048;
+      description = ''
+        Size of disk image. Unit is MB.
+      '';
+    };
+  };
+  config = {
+    system.build.azureImage = import ../../lib/make-disk-image.nix {
+      name = "azure-image";
+      postVM = ''
+        ${pkgs.vmTools.qemu}/bin/qemu-img convert -f raw -o subformat=fixed,force_size -O vpc $diskImage $out/disk.vhd
+        rm $diskImage
+      '';
+      configFile = ./azure-config-user.nix;
+      format = "raw";
+      inherit (cfg) diskSize;
+      inherit config lib pkgs;
+    };
+
+    # Azure metadata is available as a CD-ROM drive.
+    fileSystems."/metadata".device = "/dev/sr0";
+
+    systemd.services.fetch-ssh-keys = {
+      description = "Fetch host keys and authorized_keys for root user";
+
+      wantedBy = [ "sshd.service" "waagent.service" ];
+      before = [ "sshd.service" "waagent.service" ];
+
+      path  = [ pkgs.coreutils ];
+      script =
+        ''
+          eval "$(cat /metadata/CustomData.bin)"
+          if ! [ -z "$ssh_host_ecdsa_key" ]; then
+            echo "downloaded ssh_host_ecdsa_key"
+            echo "$ssh_host_ecdsa_key" > /etc/ssh/ssh_host_ed25519_key
+            chmod 600 /etc/ssh/ssh_host_ed25519_key
+          fi
+
+          if ! [ -z "$ssh_host_ecdsa_key_pub" ]; then
+            echo "downloaded ssh_host_ecdsa_key_pub"
+            echo "$ssh_host_ecdsa_key_pub" > /etc/ssh/ssh_host_ed25519_key.pub
+            chmod 644 /etc/ssh/ssh_host_ed25519_key.pub
+          fi
+
+          if ! [ -z "$ssh_root_auth_key" ]; then
+            echo "downloaded ssh_root_auth_key"
+            mkdir -m 0700 -p /root/.ssh
+            echo "$ssh_root_auth_key" > /root/.ssh/authorized_keys
+            chmod 600 /root/.ssh/authorized_keys
+          fi
+        '';
+      serviceConfig.Type = "oneshot";
+      serviceConfig.RemainAfterExit = true;
+      serviceConfig.StandardError = "journal+console";
+      serviceConfig.StandardOutput = "journal+console";
+    };
+  };
+}