[Bug 1914584] Re: [SRU] radosgw-admin user create error message confusing if user with email already exists

[Ponnuvel Palaniyappan]

Attaching debdiff for Focal.

** Attachment added: "focal-debidff.txt"
   https://bugs.launchpad.net/ubuntu/+source/ceph/+bug/1914584/+attachment/5486154/+files/focal-debidff.txt

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https://bugs.launchpad.net/bugs/1914584

Title:
  [SRU] radosgw-admin user create error message confusing if user with
  email already exists

Status in Ceph:
  Unknown
Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive queens series:
  Triaged
Status in Ubuntu Cloud Archive rocky series:
  Triaged
Status in Ubuntu Cloud Archive stein series:
  Triaged
Status in Ubuntu Cloud Archive train series:
  Triaged
Status in Ubuntu Cloud Archive ussuri series:
  Triaged
Status in Ubuntu Cloud Archive victoria series:
  Triaged
Status in ceph package in Ubuntu:
  Triaged
Status in ceph source package in Bionic:
  Triaged
Status in ceph source package in Focal:
  Triaged
Status in ceph source package in Groovy:
  Triaged
Status in ceph source package in Hirsute:
  Triaged

Bug description:
  [Impact]

  When creating a new S3 user, the error message is confusing if the
  email address used is already associated with another S3 account.

  To reproduce:

  radosgw-admin user create --uid=foo --display-name="Foo test" --email=bar at domain.invalid
  #[ success ]
  radosgw-admin user create --uid=test --display-name="AN test" --email=bar at domain.invalid
  could not create user: unable to parse parameters, user id mismatch, operation id: foo does not match: test

  As a result, it's completely unclear what went wrong with the user
  creation.

  [Test case]

  Create an S3 account via radosgw-admin. Then create another user but use
  the same email address - it should provide a clear description of what
  the problem is.

  [Where problems could occur]

  The new message may yet be unclear or could complain that an email
  exists even though it doesn't exist (false positive). It's an improved
  diagnostic by checking if the email id exists. Perhaps, user creation
  might become problematic if the fix doesn't work.

  [Other Info]
  - The patch was provided by Matthew Vernon (attached here)
  - Upstream tracker: https://tracker.ceph.com/issues/49137
  - Upstream PR: https://github.com/ceph/ceph/pull/39293
  - Backported to Pacific, Octopus, and Nautilus upstream releases. Luminous is EOL'ed upstream, so we'd like to backport to Luminous (Bionic/queens).

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