terraform-providers: fix the google and google-beta providers

pkgs/applications/networking/cluster/terraform-providers/default.nix

@@ -15,18 +15,51 @@ let
       src = fetchFromGitHub {
         inherit owner repo rev sha256;
       };
-
-
       # Terraform allow checking the provider versions, but this breaks
       # if the versions are not provided via file paths.
       postBuild = "mv go/bin/${repo}{,_v${version}}";
     };
-in
-  {
+
+  # Google is now using the vendored go modules, which works a bit differently
+  # and is not 100% compatible with the pre-modules vendored folders.
+  #
+  # Instead of switching to goModules which requires a goModSha256, patch the
+  # goPackage derivation so it can install the top-level.
+  patchGoModVendor = drv:
+    drv.overrideAttrs (attrs: {
+      buildFlags = "-mod=vendor";
+
+      # override configurePhase to not move the source into GOPATH
+      configurePhase = ''
+        export GOPATH=$NIX_BUILD_TOP/go:$GOPATH
+        export GOCACHE=$TMPDIR/go-cache
+        export GO111MODULE=on
+      '';
+
+      # just build and install into $GOPATH/bin
+      buildPhase = ''
+        go install -mod=vendor -v -p 16 .
+      '';
+
+      # don't run the tests, they are broken in this setup
+      doCheck = false;
+    });
+
+  # These providers are managed with the ./update-all script
+  automated-providers = lib.mapAttrs (_: toDrv) list;
+
+  # These are the providers that don't fall in line with the default model
+  special-providers = {
+    # Override the google providers
+    google = patchGoModVendor automated-providers.google;
+    google-beta = patchGoModVendor automated-providers.google-beta;
+
     elasticsearch = callPackage ./elasticsearch {};
     gandi = callPackage ./gandi {};
     ibm = callPackage ./ibm {};
     libvirt = callPackage ./libvirt {};
     lxd = callPackage ./lxd {};
     ansible = callPackage ./ansible {};
-  } // lib.mapAttrs (n: v: toDrv v) list
+  };
+in
+  automated-providers // special-providers