Delete image from single store

Change-Id: I283dfdefbdf6604365fb3fb0209e8deba2c18eae

specs/ussuri/approved/glance/delete-image-from-single-store.rst

@@ -0,0 +1,131 @@
+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+================================
+Deleting image from single store
+================================
+
+Include the URL of your launchpad blueprint:
+
+https://blueprints.launchpad.net/glance/+spec/delete-from-store
+
+New API feature to remove image from single store instead of whacking the
+whole image.
+
+
+Problem description
+===================
+
+Currently only way to remove image from single store is by exposing known
+problematic locations API and utilize that to remove the location. With
+multiple-stores support there is definitely more user oriented use-cases
+for removing image from specific store.
+
+
+Proposed change
+===============
+
+Introduce new "/v2/stores" endpoint to Images API v2 to provide safe way to
+delete images from the specific store.
+
+New API call:
+'DELETE /v2/stores/<StoreID>/<ImageID>'
+
+Alternatives
+------------
+
+We could consider utilizing the current "v2/images/<ImageID>" endpoint and
+append the store ID at the end of that. The risk with this approach is that
+it's way too easy for the API user to make a mistake dropping the StoreID and
+accidentally delete the whole image instead of just removing it from single
+store.
+
+Data model impact
+-----------------
+
+None
+
+REST API impact
+---------------
+
+New API endpoint "v2/stores/<StoreID>/<ImageID>" that accepts only DELETE
+http method.
+
+The request will fail if this is the only location indicating that the
+user should delete the image instead.
+
+Security impact
+---------------
+
+This change does not have any know security impacts.
+
+Notifications impact
+--------------------
+
+Notification of image being removed from the store can be considered.
+
+Other end user impact
+---------------------
+
+python-glanceclient will have feature to support this API call.
+
+Performance Impact
+------------------
+
+This feature has no know performance impacts.
+
+Other deployer impact
+---------------------
+
+None
+
+Developer impact
+----------------
+
+None
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  jokke
+
+Work Items
+----------
+
+* API change for glance-api service
+
+* Testing for the new feature
+
+* python-glanceclient support
+
+* Documentation needs to be updated including the new workflow
+
+Dependencies
+============
+
+None
+
+
+Testing
+=======
+
+The change will need unit and functional tests.
+
+
+Documentation Impact
+====================
+
+None
+
+References
+==========
+
+None

specs/ussuri/approved/index.rst

@@ -6,5 +6,11 @@ Ussuri Approved Specifications
    :glob:
    :maxdepth: 1
 
-TODO: fill this in until a new approved space is added.
 
+Ussuri approved specs for Glance:
+
+.. toctree::
+    :glob:
+    :maxdepth: 1
+
+    glance/*