Implement import content generator output into koji

This commit prepares a directory with outputs that will be uploaded to
koji (just the mmd file for now). It also adjusts koji_import to call
CGImport with the metadata and the directory to import the results.

Last step will be to call this method at the end of successful module
build

module_build_service/builder/KojiContentGenerator.py

@@ -23,9 +23,13 @@
 
 
 import calendar
-import logging
-import platform
 import hashlib
+import logging
+import json
+import os
+import platform
+import shutil
+import tempfile
 
 import koji
 
@@ -164,7 +168,34 @@ class KojiContentGenerator(object):
 
         return ret
 
+    def _prepare_file_directory(self):
+        """ Creates a temporary directory that will contain all the files
+        mentioned in the outputs section
+
+        Returns path to the temporary directory
+        """
+        prepdir = tempfile.mkdtemp(prefix="koji-cg-import")
+        mmd_path = os.path.join(prepdir, "modulemd.yaml")
+        with open(mmd_path, "w") as mmd_f:
+            mmd_f.write(self.mmd)
+        return prepdir
+
+
     def koji_import(self):
+        """This method imports given module into the configured koji instance as
+        a content generator based build
+
+        Raises an exception when error is encountered during import"""
         session = KojiModuleBuilder.get_session(self.config, self.owner)
 
         metadata = self._get_content_generator_metadata()
+        file_dir = self._prepare_file_directory()
+        try:
+            build_info = session.CGImport(metadata, file_dir)
+            log.debug("Content generator import done: %s",
+                      json.dumps(build_info, sort_keys=True, indent=4))
+        except Exception, e:
+            log.error("Content generator import failed: %s", e)
+            raise e
+        finally:
+            shutil.rmtree(file_dir)

tests/test_content_generator.py

@@ -74,6 +74,7 @@ class TestBuild(unittest.TestCase):
     @patch("platform.machine")
     @patch("module_build_service.builder.KojiContentGenerator.KojiContentGenerator._koji_rpms_in_tag")
     def test_get_generator_json(self, rpms_in_tag, machine, distro, pkg_res):
+        """ Test generation of content generator json """
         self.maxDiff = None
         distro.return_value = ("Fedora", "25", "Twenty Five")
         machine.return_value = "i686"
@@ -93,3 +94,10 @@ class TestBuild(unittest.TestCase):
         ret = self.cg._get_content_generator_metadata()
         rpms_in_tag.assert_called_once()
         self.assertEqual(expected_output, ret)
+
+
+    def test_prepare_file_directory(self):
+        """ Test preparation of directory with output files """
+        dir_path = self.cg._prepare_file_directory()
+        with open(path.join(dir_path, "modulemd.yaml")) as mmd:
+            self.assertEqual(len(mmd.read()), 1134)