kolla-build: Add Docker BuildKit support via docker buildx build

Add --buildkit flag to use docker buildx build instead of the docker-py
SDK. An optional --buildkit-builder selects a named buildx builder
instance, enabling docker-container or remote drivers for multi-arch
builds.

--buildkit and --squash are mutually exclusive and rejected at startup.
PushTask is skipped when buildkit is active; push is handled inline.

Set buildkit as the new default.

Change-Id: Idbf1d1bdc091bb84721f8006c2b916731b999859
Signed-off-by: Michal Nasiadka <mnasiadka@gmail.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/kolla/image/build.py b/kolla/image/build.py
index 9b6571d36..a0513b22a 100644
--- a/kolla/image/build.py
+++ b/kolla/image/build.py
@@ -120,6 +120,10 @@ def run_build():
                       "Try running 'pip install docker'\n"
                       "Python error: %s", e)
             sys.exit(1)
+        if conf.buildkit and conf.squash:
+            LOG.error('--buildkit and --squash are mutually exclusive: '
+                      'docker buildx build does not support squashing.')
+            sys.exit(1)
         if conf.squash:
             squash_version = utils.get_docker_squash_version()
             LOG.info('Image squash is enabled and "docker-squash" version '
@@ -171,6 +175,12 @@ def run_build():
         kolla.list_dependencies()
         return
 
+    if (conf.engine == engine.Engine.DOCKER.value and conf.buildkit):
+        try:
+            utils.check_docker_buildx()
+        except Exception:
+            sys.exit(1)
+
     push_queue = queue.Queue()
     build_queue = kolla.build_queue(push_queue)
     workers = []