Openstack volume does not move to another instance

[GiovanniPaoloGibilisco]

Description

When trying to detatch a volume from one instance and attaching it to another instance the terraform plan command does not detect the detach and the terraform apply command fails trying to attach the volume without detatching it first.

Terraform Version

$ terraform -v
Terraform v0.7.0

Affected Resource(s)

The issue affects these resources:

• openstack_blockstorage_volume_v1
• openstack_compute_instance_v2

Terraform Configuration Files

This issue occurs after modifying the configuration file.
The configuration file is a bit long so here it goes the gist

After applying this configuration move the volume object from the test_name instance to the test_name2 instance.
Still the configuration file is a bit long so here gors the gist

Debug Output

The issue is related to two commands. The terraform plan which does not detect the detachment of the volume from the first instance and the terraform apply which fails in attaching the volume to the new isntance
The debug output of the terraform plan command is in this gist

The debug output of the terraform apply command is in this gist

Expected Behavior

The volume should be detached from the first instance and attached to the second one.

Actual Behavior

The terraform plan command detects only a new attachment on the second instance
The terraform apply command fails with

Error applying plan:

1 error(s) occurred:

* openstack_compute_instance_v2.test_name_2: Expected HTTP response code [200] when accessing [POST http://xxx.xxx.xxx.xxx:8774/v2/c660af04fabe41f29787fa27ad3400e9/servers/1b823818-d2b6-4e58-ad6f-d2476507205a/os-volume_attachments], but got 400 instead
{"badRequest": {"message": "Invalid volume: volume 'f8871928-3712-4c7a-bd0b-5bb1e5488358' status must be 'available'. Currently in 'in-use'", "code": 400}}

Steps to Reproduce

1. create a config.tf file as in the first gist
2. terraform apply
3. modify the config.tf file moving the volume element from one vm top the other (see second gist)
4. terraform plan
5. terraform apply

References

• Openstack volume does not detect detach #8040

[ghost]

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