pythonPackages.docker_pycreds: Move to own file

pkgs/development/python-modules/docker-pycreds/default.nix

@@ -0,0 +1,22 @@
+{ stdenv, buildPythonPackage, fetchPypi, six }:
+
+buildPythonPackage rec {
+  pname = "docker-pycreds";
+  version = "0.2.1";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0j3k5wk3bww5y0f2rvgzsin0q98k0i9j308vpsmxidw0y8n3m0wk";
+  };
+
+  # require docker-credential-helpers binaries
+  doCheck = false;
+
+  propagatedBuildInputs = [ six ];
+
+  meta = with stdenv.lib; {
+    description = "Python bindings for the docker credentials store API.";
+    homepage = https://github.com/shin-/dockerpy-creds;
+    license = licenses.asl20;
+  };
+}

pkgs/top-level/python-packages.nix

@@ -2134,27 +2134,7 @@ in {
 
   dockerpty = callPackage ../development/python-modules/dockerpty {};
 
-  docker_pycreds = buildPythonPackage rec {
+  docker_pycreds = callPackage ../development/python-modules/docker-pycreds {};
-    name = "docker-pycreds-${version}";
-    version = "0.2.1";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/d/docker-pycreds/${name}.tar.gz";
-      sha256 = "0j3k5wk3bww5y0f2rvgzsin0q98k0i9j308vpsmxidw0y8n3m0wk";
-    };
-
-    doCheck = false; # require docker-credential-helpers binaries
-
-    propagatedBuildInputs = with self; [
-      six
-    ];
-
-    meta = {
-      description = "Python bindings for the docker credentials store API.";
-      homepage = https://github.com/shin-/dockerpy-creds;
-      license = licenses.asl20;
-    };
-  };
 
   docker_registry_core = buildPythonPackage rec {
     name = "docker-registry-core-2.0.3";