Add new option to enable unbuildable images

I7a92b762f6a783f92ebca61e5595e1422a92df4f added checking for unbuildable
images when someone wants just templates (like TripleO for example).

But what if someone wants all images despite their buildability status?
Or wants to build for some new distro/arch combo?

--enable-unbuildable just ignores internal UNBUILDABLE_IMAGES list and
tries all images.

Change-Id: I20312b9719c6f5e3dca0b4198607ddae183152f1

kolla/common/config.py

@@ -258,7 +258,9 @@ _CLI_OPTS = [
     cfg.BoolOpt('docker-healthchecks', default=True,
                 help='Add Kolla docker healthcheck scripts in the image'),
     cfg.BoolOpt('quiet', short='q', default=False,
-                help='Do not print image logs')
+                help='Do not print image logs'),
+    cfg.BoolOpt('enable-unbuildable', default=False,
+                help='Enable images marked as unbuildable')
 ]
 
 _BASE_OPTS = [

kolla/image/build.py

@@ -1064,9 +1064,11 @@ class KollaWorker(object):
                                        self.base_arch)
         tag_re = re.compile(r'^%s(\+%s)*$' % (tag_element, tag_element))
         unbuildable_images = set()
-        for set_tag in UNBUILDABLE_IMAGES:
-            if tag_re.match(set_tag):
-                unbuildable_images.update(UNBUILDABLE_IMAGES[set_tag])
+
+        if not self.conf.enable_unbuildable:
+            for set_tag in UNBUILDABLE_IMAGES:
+                if tag_re.match(set_tag):
+                    unbuildable_images.update(UNBUILDABLE_IMAGES[set_tag])
 
         if unbuildable_images:
             for image in self.images:

releasenotes/notes/new-kolla-options-e8e32357786e8454.yaml

@@ -0,0 +1,14 @@
+---
+features:
+  - |
+    Adds `--enable-unbuildable` options to ignore internal list of unbuildable
+    images. It is useful in two situations: building for new
+    distribution/architecture or generation of templates (with
+    '--templates-only' option) when all templates are needed no matter being
+    buildable or not.
+
+upgrade:
+  - |
+    The way of generating templates (with '--templates-only' option) is changed.
+    By default only buildable ones are generated. If all templates are needed
+    then '--enable-unbuildable' option must be used.