add config to enable convertion to raw format

image-convertion config enables image convertion to raw format
this optimizes back-end capabilities while not putting the burden
of converting images to their end users

func-test-pr: https://github.com/openstack-charmers/zaza-openstack-tests/pull/582
Closes-Bug: 1899767
Change-Id: Id3791721f9e38899c87b88591cdc42e46ffea5c1

config.yaml

@@ -525,3 +525,9 @@ options:
     description: |
       Value of bluestore compression max blob size for solid state media on
       pools requested by this charm.
+  image-conversion:
+    type: boolean
+    default: False
+    description: |
+      Enable conversion of all images to raw format during image upload,
+      only supported on stein or newer.

hooks/glance_contexts.py

@@ -100,6 +100,15 @@ class GlancePolicyContext(OSContextGenerator):
         return ctxt
 
 
+class GlanceImageImportContext(OSContextGenerator):
+
+    def __call__(self):
+        ctxt = {}
+        if config('image-conversion'):
+            ctxt['image_conversion'] = config('image-conversion')
+        return ctxt
+
+
 class CephGlanceContext(OSContextGenerator):
     interfaces = ['ceph-glance']
 

hooks/glance_utils.py

@@ -200,7 +200,8 @@ CONFIG_FILES = OrderedDict([
                               interface=['storage-backend'],
                               service=['glance-api'],
                               config_file=GLANCE_API_CONF),
-                          context.MemcacheContext()],
+                          context.MemcacheContext(),
+                          glance_contexts.GlanceImageImportContext()],
         'services': ['glance-api']
     }),
     (GLANCE_SWIFT_CONF, {
@@ -301,6 +302,9 @@ def determine_packages():
     if CompareOpenStackReleases(os_release(VERSION_PACKAGE)) >= 'rocky':
         packages = [p for p in packages if not p.startswith('python-')]
         packages.extend(PY3_PACKAGES)
+    if CompareOpenStackReleases(os_release(VERSION_PACKAGE)) >= 'stein':
+        # required for image-conversion
+        packages.extend(['qemu-utils'])
     return sorted(packages)
 
 

templates/parts/section-image-import

@@ -0,0 +1,7 @@
+{% if image_conversion -%}
+[image_import_opts]
+image_import_plugins = ['image_conversion']
+
+[image_conversion]
+output_format = raw
+{% endif -%}

templates/stein/glance-api.conf

@@ -111,3 +111,5 @@ auth_endpoint = {{ service_protocol }}://{{ service_host }}:{{ service_port }}/v
 {{ key }} = {{ val }}
 {% endfor -%}
 {% endfor%}
+
+{% include "parts/section-image-import" %}