Allow the use of previously built parent images

Consider the case where you have a set of tagged / released images to
production, and you want to apply a small hotfix, security patch, etc.
to one of them, say keystone-ssh.

Rebuilding keystone-ssh will cause a rebuild of base, openstack-base,
and keystone-base, potentially pulling in updated packages / new
dependencies, unless you have access to the exact machine they were
previously built on. Ideally you want to use the exact parent images
that are in production.

This patch adds a new build argument '--skip-parents', which will result
in only the image(s) specified by the regex and their children to be
built. Parents are expected to exist either on machine or in a registry.

Change-Id: I79d5f0b422f48d2dc36ae85dfa21668cf8177837
Implements: blueprint image-build-depth

1 files changed, 20 insertions, 3 deletions

diff --git a/kolla/tests/test_build.py b/kolla/tests/test_build.py
index 1a1e019d5..a97e2c38c 100644
--- a/kolla/tests/test_build.py
+++ b/kolla/tests/test_build.py
@@ -209,6 +209,7 @@ class KollaWorkerTest(base.TestCase):
         image.status = None
         image_child = FAKE_IMAGE_CHILD.copy()
         image_child.status = None
+        image_child.parent.status = None
         image_unmatched = FAKE_IMAGE_CHILD_UNMATCHED.copy()
         image_error = FAKE_IMAGE_CHILD_ERROR.copy()
         image_built = FAKE_IMAGE_CHILD_BUILT.copy()
@@ -292,6 +293,15 @@ class KollaWorkerTest(base.TestCase):
         return [image for image in images
                 if image.status == build.STATUS_MATCHED]
 
+    def test_skip_parents(self):
+        self.conf.set_override('regex', 'image-child')
+        self.conf.set_override('skip_parents', True)
+        kolla = build.KollaWorker(self.conf)
+        kolla.images = self.images
+        kolla.filter_images()
+
+        self.assertEqual(build.STATUS_SKIPPED, kolla.images[1].parent.status)
+
     def test_without_profile(self):
         kolla = build.KollaWorker(self.conf)
         kolla.images = self.images
@@ -354,14 +364,14 @@ class MainTest(base.TestCase):
 
     @mock.patch.object(build, 'run_build')
     def test_images_built(self, mock_run_build):
-        image_statuses = ({}, {'img': 'built'}, {})
+        image_statuses = ({}, {'img': 'built'}, {}, {})
         mock_run_build.return_value = image_statuses
         result = build_cmd.main()
         self.assertEqual(0, result)
 
     @mock.patch.object(build, 'run_build')
     def test_images_unmatched(self, mock_run_build):
-        image_statuses = ({}, {}, {'img': 'unmatched'})
+        image_statuses = ({}, {}, {'img': 'unmatched'}, {})
         mock_run_build.return_value = image_statuses
         result = build_cmd.main()
         self.assertEqual(0, result)
@@ -374,7 +384,7 @@ class MainTest(base.TestCase):
 
     @mock.patch.object(build, 'run_build')
     def test_bad_images(self, mock_run_build):
-        image_statuses = ({'img': 'error'}, {}, {})
+        image_statuses = ({'img': 'error'}, {}, {}, {})
         mock_run_build.return_value = image_statuses
         result = build_cmd.main()
         self.assertEqual(1, result)
@@ -383,3 +393,10 @@ class MainTest(base.TestCase):
     def test_run_build(self, mock_sys):
         result = build.run_build()
         self.assertTrue(result)
+
+    @mock.patch.object(build, 'run_build')
+    def test_skipped_images(self, mock_run_build):
+        image_statuses = ({}, {}, {}, {'img': 'skipped'})
+        mock_run_build.return_value = image_statuses
+        result = build_cmd.main()
+        self.assertEqual(0, result)