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We found two problems related to updating user via keystone.

(1) Via, the instruction of updating user on,
http://docs.openstack.org/api/openstack-identity-
service/2.0/content/POST_updateUser_v2.0_users__userId__.html

It is required POST action to update the existing user email, name, or
description.

Via my verification, POST to update existing user caused 
{
    "error": {
        "message": "The resource could not be found.",
        "code": 404,
        "title": "Not Found"
    }
}

The detailed detail for this test is,
[root@lijunj ~]# curl -i http://localhost:35357/v3/users/fee07a4ebc014744b31564835b715aa1 -X POST -H "Content-Type: application/json" -H "Accept: application/json" -H "X-Auth-Token: ADMIN" --data '
> {
>     "user": {
>         "id": "fee07a4ebc014744b31564835b715aa1",
>         "description": "v3 keystone user test",
>         "email": "none@",
>         "enabled": true
>     }
> }'
HTTP/1.1 404 Not Found
Vary: X-Auth-Token
Content-Type: application/json
Content-Length: 93
Date: Mon, 15 Jul 2013 02:23:44 GMT

{"error": {"message": "The resource could not be found.", "code": 404,
"title": "Not Found"}}

I ensure the id fee07a4ebc014744b31564835b715aa1 user which is exisitng already in environment. Below is the output of listing v3/users/fee07a4ebc014744b31564835b715aa1
[root@lijunj ~]#  curl -i http://localhost:35357/v3/users/fee07a4ebc014744b31564835b715aa1 -X GET -H "Content-Type: application/json" -H "Accept: application/json" -H "X-Auth-Token: ADMIN"
HTTP/1.1 200 OK
Vary: X-Auth-Token
Content-Type: application/json
Content-Length: 349
Date: Mon, 15 Jul 2013 02:24:51 GMT

{"user": {"aa": "144442", "name": "test", "bb": "23", "debug-
wrongattribute": "12345", "cc": "45", "enabled": true, "links": {"self":
"http://localhost:5000/v3/users/fee07a4ebc014744b31564835b715aa1"},
"id": "fee07a4ebc014744b31564835b715aa1", "email":
"lijunjbj@xxxxxxxxxx", "debug_wrongattribute": "12345", "domain_id":
"default", "tenantId": ""}}

The user fee07a4ebc014744b31564835b715aa1 was created for testing.

We may discuss this document correction-ability. And, POST can not be
done for updating user, but PUT action can be done.

(2) Document in http://docs.openstack.org/ does not mention, updating
user can support to refresh a user tenant id/ project id. And "keystone
user-update" command does not allow to have any parameter to refresh
tenant-id / project-id of a user. But REST API keeps silent for any
clients attempting  to change a existing user tenant id or project id.
>From my test verification, in spite of changing tenant/project id for a
existing user, the user still belongs to the original tenant / project.
That means, updating tenant / project id for a user is invalid.

--Create user
curl -i http://localhost:35357/v2.0/users/ -X POST -H "Content-Type: application/json" -H "X-Auth-Token: ADMIN" --data '
{
    "user": {
        "name": "li-03",
        "description": "v2.0 keystone user test",
        "email": "none@",
        "tenantId": "ccaf7621482a41ce91d3ee824ff7c959",
        "password": "passw0rd",
        "enabled": true
    }
}'
Response:
{"user": {"description": "v2.0 keystone user test", "name": "li-03", "enabled": true, "email": "none@", "id": "00027b03821f4b7590a1a94f865a61ff", "tenantId": "ccaf7621482a41ce91d3ee824ff7c959"}}

-- List the tenant users.
curl -i http://localhost:35357/v2.0/tenants/ccaf7621482a41ce91d3ee824ff7c959/users -X GET -H "Content-Type: application/json" -H "X-Auth-Token: ADMIN"

{"users": [{"name": "sceagent", "id": "07d544b772ce4ab18592d165cea9b8da", "tenantId": 
....//The content is not important. li-03 is in tenant ccaf7621482a41ce91d3ee824ff7c959 already.
 {"name": "li-03", "description": "v2.0 keystone user test", "enabled": true, "email": "none@", "id": "00027b03821f4b7590a1a94f865a61ff", "tenantId": "ccaf7621482a41ce91d3ee824ff7c959"}]}

--Update user. Used anther tenant id inside, and rest api does not throw exception.
curl -i http://localhost:35357/v2.0/users/00027b03821f4b7590a1a94f865a61ff -X PUT -H "Content-Type: application/json" -H "X-Auth-Token: ADMIN" --data '
{
    "user": {
        "name": "li-03",
        "description": "v2.0 keystone user test 01",
        "email": "none@",
        "tenantId": "e0cdb35aa15d45f998c308eb78407513",
        "password": "passw0rd",
        "enabled": true
    }
}'

Response:
{"user": {"description": "v2.0 keystone user test 01", "name": "li-03", "extra": {"tenantId": "e0cdb35aa15d45f998c308eb78407513", "description": "v2.0 keystone user test 01", "email": "none@"}, "enabled": true, "email": "none@", "id": "00027b03821f4b7590a1a94f865a61ff", "tenantId": "e0cdb35aa15d45f998c308eb78407513"}}

--List tenant e0cdb35aa15d45f998c308eb78407513 user 
curl -i http://localhost:35357/v2.0/tenants/e0cdb35aa15d45f998c308eb78407513/users -X GET -H "Content-Type: application/json" -H "X-Auth-Token: ADMIN"

Response:
{"users": []}

The user was not updated to add into e0cdb35aa15d45f998c308eb78407513.


>From above, we can not upate user to change a existing user tenant/project. Is it good way we add the tight 'assert'/judgement for any attemption of  updating user tenantId property?

** Affects: keystone
     Importance: Undecided
         Status: Incomplete

-- 
issues of updating user via keystone rest api
https://bugs.launchpad.net/bugs/1201251
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