release_tracks: [ALPHA, BETA, GA]
help_text:
  brief: Remove IAM policy binding of a Cloud Spanner instance.
  description: |
    Remove an IAM policy binding of a Cloud Spanner instance. One binding consists of a member,
      a role, and an optional condition.

  examples: |
    To remove an IAM policy binding for the role of 'roles/editor' for the user 'test-user@gmail.com'
    with instance 'my-instance', run:

      $ {command} my-instance --member='user:test-user@gmail.com' --role='roles/editor'

    To remove an IAM policy binding which expires at the end of the year 2018 for the role of
    'roles/spanner.admin' and the user 'test-user@gmail.com' with instance 'my-instance', run:

      $ {command} my-instance --member='user:test-user@gmail.com' --role='roles/spanner.admin' --condition='expression=request.time < timestamp("2019-01-01T00:00:00Z"),title=expires_end_of_2018,description=Expires at midnight on 2018-12-31'

    See https://cloud.google.com/iam/docs/managing-policies for details of
    policy role and member types.

request:
  collection: spanner.projects.instances

arguments:
  resource:
    help_text: The Cloud Spanner instance to remove the IAM policy binding from.
    spec: !REF googlecloudsdk.command_lib.spanner.resources:instance

iam:
  enable_condition: true
  policy_version: 3
  get_iam_policy_version_path: getIamPolicyRequest.options.requestedPolicyVersion