Do not leak internal data into final MMD files attached to CG build.

This commit introduces KojiContentGenerator._sanitize_mmd method to:
- remove `repository` and `cache` from ComponentRPM in Modulemd.
- remove `mbs` section from `xmd`.

This is done to not leak internal build-only information to final
modulemd files.

module_build_service/builder/KojiContentGenerator.py

@@ -41,7 +41,7 @@ from six import text_type
 import koji
 import pungi.arch
 
-from module_build_service import log, build_logs, Modulemd
+from module_build_service import log, build_logs, Modulemd, glib
 
 logging.basicConfig(level=logging.DEBUG)
 
@@ -567,6 +567,32 @@ class KojiContentGenerator(object):
         mmd.set_rpm_artifacts(rpm_artifacts)
         return mmd
 
+    def _sanitize_mmd(self, mmd):
+        """
+        Returns sanitized modulemd file.
+
+        This method mainly removes the internal only information from the
+        modulemd file which should not leak to final modulemd.
+
+        :param Modulemd mmd: Modulemd instance to sanitize.
+        :rtype: Modulemd.
+        :return: Sanitized Modulemd instance.
+        """
+        # Remove components.repository and components.cache.
+        for pkg in mmd.get_rpm_components().values():
+            if pkg.get_repository():
+                pkg.set_repository(None)
+            if pkg.get_cache():
+                pkg.set_cache(None)
+
+        # Remove 'mbs' XMD section.
+        xmd = glib.from_variant_dict(mmd.get_xmd())
+        if "mbs" in xmd:
+            del xmd["mbs"]
+            mmd.set_xmd(glib.dict_values(xmd))
+
+        return mmd
+
     def _finalize_mmd(self, arch):
         """
         Finalizes the modulemd:
@@ -576,7 +602,7 @@ class KojiContentGenerator(object):
         :rtype: str
         :return: Finalized modulemd string.
         """
-        mmd = self.module.mmd()
+        mmd = self._sanitize_mmd(self.module.mmd())
         if self.devel:
             mmd.set_name(mmd.get_name() + "-devel")
 

tests/test_content_generator.py

@@ -29,7 +29,7 @@ from os import path
 
 import module_build_service.messaging
 import module_build_service.scheduler.handlers.repos # noqa
-from module_build_service import models, conf, build_logs, Modulemd
+from module_build_service import models, conf, build_logs, Modulemd, glib
 
 from mock import patch, Mock, MagicMock, call, mock_open
 import kobo.rpmlib
@@ -613,3 +613,20 @@ class TestBuild:
                 "dhcp-libs-12:4.3.5-5.module_2118aef6.noarch"])
         else:
             assert set(mmd.get_rpm_artifacts().get()) == set([])
+
+    def test_sanitize_mmd(self):
+        mmd = self.cg.module.mmd()
+        component = Modulemd.ComponentRpm()
+        component.set_name("foo")
+        component.set_rationale("foo")
+        component.set_repository("http://private.tld/foo.git")
+        component.set_cache("http://private.tld/cache")
+        mmd.add_rpm_component(component)
+        mmd.set_xmd(glib.dict_values({"mbs": {"buildrequires": []}}))
+        mmd = self.cg._sanitize_mmd(mmd)
+
+        for pkg in mmd.get_rpm_components().values():
+            assert pkg.get_repository() is None
+            assert pkg.get_cache() is None
+
+        assert "mbs" not in mmd.get_xmd().keys()