Enable object versioning for a container

This patch adds the config option rgw-swift-versioning-enabled boolean that enables swift versioning for the ceph-backed storage solution.  This uses X-Versions-Location as it is the only header that radosgw interprets.

closes-bug: #1910679
Change-Id: I5b42c34882b46e96f4cc92d91ec441a4bdfd76f6

config.yaml

@@ -500,3 +500,12 @@ options:
     description: |
       Value of bluestore compression max blob size for solid state media on
       pools requested by this charm.
+  rgw-swift-versioning-enabled:
+    type: boolean
+    default: False
+    description: |
+      If True, swift object versioning will be enabled for radosgw.
+
+      NOTE: X-Versions-Location is the only versioning-related header that
+      radosgw interprets. X-History-Location, supported by native OpenStack
+      Swift, is currently not supported by radosgw.

hooks/ceph_radosgw_context.py

@@ -207,6 +207,7 @@ class MonContext(context.CephContext):
             # not available externally). ~tribaal
             'unit_public_ip': unit_public_ip(),
             'fsid': fsid,
+            'rgw_swift_versioning': config('rgw-swift-versioning-enabled'),
         }
 
         # NOTE(dosaboy): these sections must correspond to what is supported in

templates/ceph.conf

@@ -14,6 +14,7 @@ debug rgw = {{ loglevel }}/5
 {% if ipv6 -%}
 ms bind ipv6 = true
 {% endif %}
+rgw swift versioning enabled = {{ rgw_swift_versioning }}
 {% if global -%}
 # The following are user-provided options provided via the config-flags charm option.
 # User-provided [global] section config

unit_tests/test_ceph_radosgw_context.py

@@ -387,6 +387,7 @@ class MonContextTest(CharmTestCase):
             'ipv6': False,
             'rgw_zone': 'default',
             'fsid': 'testfsid',
+            'rgw_swift_versioning': False,
         }
         self.assertEqual(expect, mon_ctxt())
         self.assertFalse(mock_ensure_rsv_v6.called)
@@ -435,6 +436,7 @@ class MonContextTest(CharmTestCase):
             'ipv6': False,
             'rgw_zone': 'default',
             'fsid': 'testfsid',
+            'rgw_swift_versioning': False,
         }
         self.assertEqual(expect, mon_ctxt())
         self.assertFalse(mock_ensure_rsv_v6.called)
@@ -492,6 +494,7 @@ class MonContextTest(CharmTestCase):
             'ipv6': False,
             'rgw_zone': 'default',
             'fsid': 'testfsid',
+            'rgw_swift_versioning': False,
         }
         self.assertEqual(expect, mon_ctxt())
 
@@ -531,6 +534,7 @@ class MonContextTest(CharmTestCase):
             'ipv6': False,
             'rgw_zone': 'default',
             'fsid': 'testfsid',
+            'rgw_swift_versioning': False,
         }
         self.assertEqual(expect, mon_ctxt())