Repository: gophercloud/gophercloud

Issue:
Cinder "manage existing volume" feature
I want to use the "manage existing volume" feature of Cinder, but there seems to be no implementation.
Are there any plans to implement it?

ref. https://docs.openstack.org/api-ref/block-storage/v3/#volume-manage-extension-manageable-volumes

Discussion:
@github-actions: Thank you for reporting your first issue! Be sure that we will be looking at it, but keep in mind
this sometimes takes a while.
Please let the maintainers know if your issue has not got enough attention after a few days.
If any doubt, please consult our issue [tutorial](https://github.com/gophercloud/gophercloud/blob/main/docs/contributor-tutorial/step-02-issues.md).@TOMOFUMI-KONDO: I worked on it!
- https://github.com/gophercloud/gophercloud/pull/3332

Solution patch:
diff --git a/internal/acceptance/openstack/blockstorage/v3/blockstorage.go b/internal/acceptance/openstack/blockstorage/v3/blockstorage.go
index 56cf612ab..62e11af9b 100644
--- a/internal/acceptance/openstack/blockstorage/v3/blockstorage.go
+++ b/internal/acceptance/openstack/blockstorage/v3/blockstorage.go
@@ -14,6 +14,7 @@ import (
 	"github.com/gophercloud/gophercloud/v2"
 	"github.com/gophercloud/gophercloud/v2/internal/acceptance/tools"
 	"github.com/gophercloud/gophercloud/v2/openstack/blockstorage/v3/backups"
+	"github.com/gophercloud/gophercloud/v2/openstack/blockstorage/v3/manageablevolumes"
 	"github.com/gophercloud/gophercloud/v2/openstack/blockstorage/v3/qos"
 	"github.com/gophercloud/gophercloud/v2/openstack/blockstorage/v3/snapshots"
 	"github.com/gophercloud/gophercloud/v2/openstack/blockstorage/v3/volumes"
@@ -779,3 +780,78 @@ func ReImage(t *testing.T, client *gophercloud.ServiceClient, volume *volumes.Vo
 
 	return nil
 }
+
+func Unmanage(t *testing.T, client *gophercloud.ServiceClient, volume *volumes.Volume) error {
+	t.Logf("Attempting to unmanage volume %s", volume.ID)
+
+	err := volumes.Unmanage(context.TODO(), client, volume.ID).ExtractErr()
+	if err != nil {
+		return err
+	}
+
+	err = gophercloud.WaitFor(context.TODO(), func(ctx context.Context) (bool, error) {
+		if _, err := volumes.Get(ctx, client, volume.ID).Extract(); err != nil {
+			if errCode, ok := err.(gophercloud.ErrUnexpectedResponseCode); ok {
+				if errCode.Actual == 404 {
+					return true, nil
+				}
+			}
+			return false, err
+		}
+		return false, nil
+	})
+	if err != nil {
+		return fmt.Errorf("error waiting for volume %s to be unmanaged: %v", volume.ID, err)
+	}
+
+	t.Logf("Successfully unmanaged volume %s", volume.ID)
+
+	return nil
+}
+
+func ManageExisting(t *testing.T, client *gophercloud.ServiceClient, volume *volumes.Volume) (*volumes.Volume, error) {
+	t.Logf("Attempting to manage existing volume %s", volume.Name)
+
+	manageOpts := manageablevolumes.ManageExistingOpts{
+		Host: volume.Host,
+		Ref: map[string]string{
+			"source-name": fmt.Sprintf("volume-%s", volume.ID),
+		},
+		Name:             volume.Name,
+		AvailabilityZone: volume.AvailabilityZone,
+		Description:      volume.Description,
+		VolumeType:       volume.VolumeType,
+		Bootable:         volume.Bootable == "true",
+		Metadata:         volume.Metadata,
+	}
+
+	managed, err := manageablevolumes.ManageExisting(context.TODO(), client, manageOpts).Extract()
+	if err != nil {
+		return managed, err
+	}
+
+	ctx, cancel := context.WithTimeout(context.TODO(), 60*time.Second)
+	defer cancel()
+
+	if err := volumes.WaitForStatus(ctx, client, managed.ID, "available"); err != nil {
+		return managed, err
+	}
+
+	managed, err = volumes.Get(context.TODO(), client, managed.ID).Extract()
+	if err != nil {
+		return managed, err
+	}
+
+	tools.PrintResource(t, managed)
+	th.AssertEquals(t, managed.Host, volume.Host)
+	th.AssertEquals(t, managed.Name, volume.Name)
+	th.AssertEquals(t, managed.AvailabilityZone, volume.AvailabilityZone)
+	th.AssertEquals(t, managed.Description, volume.Description)
+	th.AssertEquals(t, managed.VolumeType, volume.VolumeType)
+	th.AssertEquals(t, managed.Bootable, volume.Bootable)
+	th.AssertDeepEquals(t, managed.Metadata, volume.Metadata)
+
+	t.Logf("Successfully managed existing volume %s", managed.ID)
+
+	return managed, nil
+}
diff --git a/openstack/blockstorage/v3/manageablevolumes/doc.go b/openstack/blockstorage/v3/manageablevolumes/doc.go
new file mode 100644
index 000000000..a2217fc0f
--- /dev/null
+++ b/openstack/blockstorage/v3/manageablevolumes/doc.go
@@ -0,0 +1,32 @@
+/*
+Package manageablevolumes information and interaction with manageable volumes
+for the OpenStack Block Storage service.
+
+NOTE: Requires at least microversion 3.8
+
+Example to manage an existing volume
+
+	manageOpts := manageablevolumes.ManageExistingOpts{
+		Host:             "host@lvm#LVM",
+		Ref:              map[string]string{
+			"source-name": "volume-73796b96-169f-4675-a5bc-73fc0f8f9a17",
+		},
+		Name:             "New Volume",
+		AvailabilityZone: "nova",
+		Description:      "Volume imported from existingLV",
+		VolumeType:       "lvm",
+		Bootable:         true,
+		Metadata:         map[string]string{
+			"key1": "value1",
+			"key2": "value2"
+		},
+	}
+
+	managedVolume, err := manageablevolumes.ManageExisting(context.TODO(), client, manageOpts).Extract()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Printf("Managed volume: %+v\n", managedVolume)
+*/
+package manageablevolumes
diff --git a/openstack/blockstorage/v3/manageablevolumes/requests.go b/openstack/blockstorage/v3/manageablevolumes/requests.go
new file mode 100644
index 000000000..42c5593cd
--- /dev/null
+++ b/openstack/blockstorage/v3/manageablevolumes/requests.go
@@ -0,0 +1,61 @@
+package manageablevolumes
+
+import (
+	"context"
+
+	"github.com/gophercloud/gophercloud/v2"
+)
+
+// ManageExistingOptsBuilder allows extentions to add additional parameters to the ManageExisting request.
+type ManageExistingOptsBuilder interface {
+	ToManageExistingMap() (map[string]any, error)
+}
+
+// ManageExistingOpts contains options for managing a existing volume.
+// This object is passed to the volumes.ManageExisting function.
+// For more information about the parameters, see the Volume object and OpenStack BlockStorage API Guide.
+type ManageExistingOpts struct {
+	// The OpenStack Block Storage host where the existing resource resides.
+	// Optional only if cluster field is provided.
+	Host string `json:"host,omitempty"`
+	// The OpenStack Block Storage cluster where the resource resides.
+	// Optional only if host field is provided.
+	Cluster string `json:"cluster,omitempty"`
+	// A reference to the existing volume.
+	// The internal structure of this reference depends on the volume driver implementation.
+	// For details about the required elements in the structure, see the documentation for the volume driver.
+	Ref map[string]string `json:"ref,omitempty"`
+	// Human-readable display name for the volume.
+	Name string `json:"name,omitempty"`
+	// The availability zone.
+	AvailabilityZone string `json:"availability_zone,omitempty"`
+	// Human-readable description for the volume.
+	Description string `json:"description,omitempty"`
+	// The associated volume type
+	VolumeType string `json:"volume_type,omitempty"`
+	// Indicates whether this is a bootable volume.
+	Bootable bool `json:"bootable,omitempty"`
+	// One or more metadata key and value pairs to associate with the volume.
+	Metadata map[string]string `json:"metadata,omitempty"`
+}
+
+// ToManageExistingMap assembles a request body based on the contents of a ManageExistingOpts.
+func (opts ManageExistingOpts) ToManageExistingMap() (map[string]any, error) {
+	return gophercloud.BuildRequestBody(opts, "volume")
+}
+
+// ManageExisting will manage an existing volume based on the values in ManageExistingOpts.
+// To extract the Volume object from response, call the Extract method on the ManageExistingResult.
+func ManageExisting(ctx context.Context, client *gophercloud.ServiceClient, opts ManageExistingOptsBuilder) (r ManageExistingResult) {
+	b, err := opts.ToManageExistingMap()
+	if err != nil {
+		r.Err = err
+		return
+	}
+
+	resp, err := client.Post(ctx, createURL(client), b, &r.Body, &gophercloud.RequestOpts{
+		OkCodes: []int{202},
+	})
+	_, r.Header, r.Err = gophercloud.ParseResponse(resp, err)
+	return
+}
diff --git a/openstack/blockstorage/v3/manageablevolumes/results.go b/openstack/blockstorage/v3/manageablevolumes/results.go
new file mode 100644
index 000000000..317ed21fb
--- /dev/null
+++ b/openstack/blockstorage/v3/manageablevolumes/results.go
@@ -0,0 +1,22 @@
+package manageablevolumes
+
+import (
+	"github.com/gophercloud/gophercloud/v2"
+	"github.com/gophercloud/gophercloud/v2/openstack/blockstorage/v3/volumes"
+)
+
+type ManageExistingResult struct {
+	gophercloud.Result
+}
+
+// Extract will get the Volume object out of the ManageExistingResult object.
+func (r ManageExistingResult) Extract() (*volumes.Volume, error) {
+	var s volumes.Volume
+	err := r.ExtractInto(&s)
+	return &s, err
+}
+
+// ExtractInto converts our response data into a volume struct
+func (r ManageExistingResult) ExtractInto(v any) error {
+	return r.Result.ExtractIntoStructPtr(v, "volume")
+}
diff --git a/openstack/blockstorage/v3/manageablevolumes/urls.go b/openstack/blockstorage/v3/manageablevolumes/urls.go
new file mode 100644
index 000000000..c58c94a39
--- /dev/null
+++ b/openstack/blockstorage/v3/manageablevolumes/urls.go
@@ -0,0 +1,7 @@
+package manageablevolumes
+
+import "github.com/gophercloud/gophercloud/v2"
+
+func createURL(c *gophercloud.ServiceClient) string {
+	return c.ServiceURL("manageable_volumes")
+}
diff --git a/openstack/blockstorage/v3/volumes/doc.go b/openstack/blockstorage/v3/volumes/doc.go
index 2ab4af93e..e018b57a8 100644
--- a/openstack/blockstorage/v3/volumes/doc.go
+++ b/openstack/blockstorage/v3/volumes/doc.go
@@ -157,5 +157,12 @@ Example of Attaching a Volume to an Instance
 	if err != nil {
 		panic(err)
 	}
+
+Example of Unmanaging a Volume
+
+	err := volumes.Unmanage(context.TODO(), client, volume.ID).ExtractErr()
+	if err != nil {
+		panic(err)
+	}
 */
 package volumes
diff --git a/openstack/blockstorage/v3/volumes/requests.go b/openstack/blockstorage/v3/volumes/requests.go
index 4dc2c1be7..1026d1eca 100644
--- a/openstack/blockstorage/v3/volumes/requests.go
+++ b/openstack/blockstorage/v3/volumes/requests.go
@@ -775,3 +775,14 @@ func ResetStatus(ctx context.Context, client *gophercloud.ServiceClient, id stri
 	_, r.Header, r.Err = gophercloud.ParseResponse(resp, err)
 	return
 }
+
+// Unmanage removes a volume from Block Storage management without
+// removing the back-end storage object that is associated with it.
+func Unmanage(ctx context.Context, client *gophercloud.ServiceClient, id string) (r UnmanageResult) {
+	body := map[string]any{"os-unmanage": make(map[string]any)}
+	resp, err := client.Post(ctx, actionURL(client, id), body, nil, &gophercloud.RequestOpts{
+		OkCodes: []int{202},
+	})
+	_, r.Header, r.Err = gophercloud.ParseResponse(resp, err)
+	return
+}
diff --git a/openstack/blockstorage/v3/volumes/results.go b/openstack/blockstorage/v3/volumes/results.go
index 3f184b398..e99ef5e19 100644
--- a/openstack/blockstorage/v3/volumes/results.go
+++ b/openstack/blockstorage/v3/volumes/results.go
@@ -399,3 +399,8 @@ type ReImageResult struct {
 type ResetStatusResult struct {
 	gophercloud.ErrResult
 }
+
+// UnmanageResult contains the response error from a Unmanage request.
+type UnmanageResult struct {
+	gophercloud.ErrResult
+}



Test patch:
diff --git a/internal/acceptance/openstack/blockstorage/v3/manageablevolumes_test.go b/internal/acceptance/openstack/blockstorage/v3/manageablevolumes_test.go
new file mode 100644
index 000000000..a555e706c
--- /dev/null
+++ b/internal/acceptance/openstack/blockstorage/v3/manageablevolumes_test.go
@@ -0,0 +1,57 @@
+//go:build acceptance || blockstorage || volumes
+
+package v3
+
+import (
+	"context"
+	"testing"
+
+	"github.com/gophercloud/gophercloud/v2/internal/acceptance/clients"
+	"github.com/gophercloud/gophercloud/v2/openstack/blockstorage/v3/volumes"
+	th "github.com/gophercloud/gophercloud/v2/testhelper"
+)
+
+func TestManageableVolumes(t *testing.T) {
+	clients.RequireLong(t)
+
+	client, err := clients.NewBlockStorageV3Client()
+	th.AssertNoErr(t, err)
+
+	client.Microversion = "3.8"
+
+	volume1, err := CreateVolume(t, client)
+	th.AssertNoErr(t, err)
+
+	err = Unmanage(t, client, volume1)
+	if err != nil {
+		DeleteVolume(t, client, volume1)
+	}
+	th.AssertNoErr(t, err)
+
+	managed1, err := ManageExisting(t, client, volume1)
+	th.AssertNoErr(t, err)
+	defer DeleteVolume(t, client, managed1)
+
+	th.CheckEquals(t, volume1.Host, managed1.Host)
+	th.AssertEquals(t, volume1.Name, managed1.Name)
+	th.AssertEquals(t, volume1.AvailabilityZone, managed1.AvailabilityZone)
+	th.AssertEquals(t, volume1.Description, managed1.Description)
+	th.AssertEquals(t, volume1.VolumeType, managed1.VolumeType)
+	th.AssertEquals(t, volume1.Bootable, managed1.Bootable)
+	th.AssertDeepEquals(t, volume1.Metadata, managed1.Metadata)
+	th.AssertEquals(t, volume1.Size, managed1.Size)
+
+	allPages, err := volumes.List(client, volumes.ListOpts{}).AllPages(context.TODO())
+	th.AssertNoErr(t, err)
+	allVolumes, err := volumes.ExtractVolumes(allPages)
+	th.AssertNoErr(t, err)
+
+	var found bool
+	for _, v := range allVolumes {
+		if v.ID == managed1.ID {
+			found = true
+			break
+		}
+	}
+	th.AssertEquals(t, true, found)
+}
diff --git a/openstack/blockstorage/v3/manageablevolumes/testing/doc.go b/openstack/blockstorage/v3/manageablevolumes/testing/doc.go
new file mode 100644
index 000000000..4acd66588
--- /dev/null
+++ b/openstack/blockstorage/v3/manageablevolumes/testing/doc.go
@@ -0,0 +1,2 @@
+// manageablevolumes unit tests
+package testing
diff --git a/openstack/blockstorage/v3/manageablevolumes/testing/fixtures_test.go b/openstack/blockstorage/v3/manageablevolumes/testing/fixtures_test.go
new file mode 100644
index 000000000..5fdc8fb99
--- /dev/null
+++ b/openstack/blockstorage/v3/manageablevolumes/testing/fixtures_test.go
@@ -0,0 +1,93 @@
+package testing
+
+import (
+	"fmt"
+	"net/http"
+	"testing"
+
+	th "github.com/gophercloud/gophercloud/v2/testhelper"
+	fake "github.com/gophercloud/gophercloud/v2/testhelper/client"
+)
+
+func MockManageExistingResponse(t *testing.T) {
+	th.Mux.HandleFunc("/manageable_volumes", func(w http.ResponseWriter, r *http.Request) {
+		th.TestMethod(t, r, "POST")
+		th.TestHeader(t, r, "X-Auth-Token", fake.TokenID)
+		th.TestHeader(t, r, "Content-Type", "application/json")
+		th.TestHeader(t, r, "Accept", "application/json")
+		th.TestJSONRequest(t, r, `
+{
+    "volume": {
+        "host": "host@lvm#LVM",
+        "ref": {
+            "source-name": "volume-73796b96-169f-4675-a5bc-73fc0f8f9a17"
+        },
+        "name": "New Volume",
+        "availability_zone": "nova",
+        "description": "Volume imported from existingLV",
+        "volume_type": "lvm",
+        "bootable": true,
+        "metadata": {
+            "key1": "value1",
+            "key2": "value2"
+        }
+    }
+}
+		`)
+
+		w.Header().Add("Content-Type", "application/json")
+		w.WriteHeader(http.StatusAccepted)
+
+		fmt.Fprint(w, `
+{
+    "volume": {
+        "id": "23cf872b-c781-4cd4-847d-5f2ec8cbd91c",
+        "status": "creating",
+        "size": 0,
+        "availability_zone": "nova",
+		"created_at": "2025-03-20T11:58:05.000000",
+        "updated_at": "2025-03-20T11:58:05.000000",
+        "name": "New Volume",
+        "description": "Volume imported from existingLV",
+        "volume_type": "lvm",
+        "snapshot_id": null,
+        "source_volid": null,
+        "metadata": {
+            "key1": "value1",
+            "key2": "value2"
+        },
+        "links": [
+            {
+                "href": "http://10.0.2.15:8776/v3/87c8522052ca4eed98bc672b4c1a3ddb/volumes/23cf872b-c781-4cd4-847d-5f2ec8cbd91c",
+                "rel": "self"
+            },
+            {
+                "href": "http://10.0.2.15:8776/87c8522052ca4eed98bc672b4c1a3ddb/volumes/23cf872b-c781-4cd4-847d-5f2ec8cbd91c",
+                "rel": "bookmark"
+            }
+        ],
+        "user_id": "eae1472b5fc5496998a3d06550929e7e",
+        "bootable": "true",
+        "encrypted": false,
+		"replication_status": null,
+		"consistencygroup_id": null,
+		"multiattach": false,
+        "attachments": [],
+        "created_at": "2014-07-18T00:12:54.000000",
+		"migration_status": null,
+		"group_id": null,
+		"provider_id": null,
+		"shared_targets": true,
+		"service_uuid": null,
+		"cluster_name": null,
+		"volume_type_id": "a218796e-605b-4b6f-9dfc-8be95a0d7d03",
+		"consumes_quota": true,
+		"os-vol-mig-status-attr:migstat": null,
+		"os-vol-mig-status-attr:name_id": null,
+        "os-vol-tenant-attr:tenant_id": "87c8522052ca4eed98bc672b4c1a3ddb",
+		"os-vol-host-attr:host": "host@lvm#LVM"
+	}
+}
+		`)
+	})
+}
diff --git a/openstack/blockstorage/v3/manageablevolumes/testing/requests_test.go b/openstack/blockstorage/v3/manageablevolumes/testing/requests_test.go
new file mode 100644
index 000000000..cabbfde4e
--- /dev/null
+++ b/openstack/blockstorage/v3/manageablevolumes/testing/requests_test.go
@@ -0,0 +1,44 @@
+package testing
+
+import (
+	"context"
+	"testing"
+
+	"github.com/gophercloud/gophercloud/v2/openstack/blockstorage/v3/manageablevolumes"
+	th "github.com/gophercloud/gophercloud/v2/testhelper"
+	"github.com/gophercloud/gophercloud/v2/testhelper/client"
+)
+
+func TestManageExisting(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+
+	MockManageExistingResponse(t)
+
+	options := &manageablevolumes.ManageExistingOpts{
+		Host:             "host@lvm#LVM",
+		Ref:              map[string]string{"source-name": "volume-73796b96-169f-4675-a5bc-73fc0f8f9a17"},
+		Name:             "New Volume",
+		AvailabilityZone: "nova",
+		Description:      "Volume imported from existingLV",
+		VolumeType:       "lvm",
+		Bootable:         true,
+		Metadata: map[string]string{
+			"key1": "value1",
+			"key2": "value2",
+		},
+	}
+	n, err := manageablevolumes.ManageExisting(context.TODO(), client.ServiceClient(), options).Extract()
+	th.AssertNoErr(t, err)
+
+	th.AssertEquals(t, n.Host, "host@lvm#LVM")
+	th.AssertEquals(t, n.Name, "New Volume")
+	th.AssertEquals(t, n.AvailabilityZone, "nova")
+	th.AssertEquals(t, n.Description, "Volume imported from existingLV")
+	th.AssertEquals(t, n.Bootable, "true")
+	th.AssertDeepEquals(t, n.Metadata, map[string]string{
+		"key1": "value1",
+		"key2": "value2",
+	})
+	th.AssertEquals(t, n.ID, "23cf872b-c781-4cd4-847d-5f2ec8cbd91c")
+}
diff --git a/openstack/blockstorage/v3/volumes/testing/fixtures_test.go b/openstack/blockstorage/v3/volumes/testing/fixtures_test.go
index 9b4630a97..3e156aca1 100644
--- a/openstack/blockstorage/v3/volumes/testing/fixtures_test.go
+++ b/openstack/blockstorage/v3/volumes/testing/fixtures_test.go
@@ -648,3 +648,19 @@ func MockResetStatusResponse(t *testing.T) {
 			w.WriteHeader(http.StatusAccepted)
 		})
 }
+
+func MockUnmanageResponse(t *testing.T) {
+	th.Mux.HandleFunc("/volumes/cd281d77-8217-4830-be95-9528227c105c/action",
+		func(w http.ResponseWriter, r *http.Request) {
+			th.TestMethod(t, r, "POST")
+			th.TestHeader(t, r, "X-Auth-Token", fake.TokenID)
+			th.TestHeader(t, r, "Content-Type", "application/json")
+			th.TestJSONRequest(t, r, `
+{
+	"os-unmanage": {}
+}
+			`)
+
+			w.WriteHeader(http.StatusAccepted)
+		})
+}
diff --git a/openstack/blockstorage/v3/volumes/testing/requests_test.go b/openstack/blockstorage/v3/volumes/testing/requests_test.go
index 5e3234674..4fbd79f00 100644
--- a/openstack/blockstorage/v3/volumes/testing/requests_test.go
+++ b/openstack/blockstorage/v3/volumes/testing/requests_test.go
@@ -538,3 +538,13 @@ func TestResetStatus(t *testing.T) {
 	err := volumes.ResetStatus(context.TODO(), client.ServiceClient(), "cd281d77-8217-4830-be95-9528227c105c", options).ExtractErr()
 	th.AssertNoErr(t, err)
 }
+
+func TestUnmanage(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+
+	MockUnmanageResponse(t)
+
+	err := volumes.Unmanage(context.TODO(), client.ServiceClient(), "cd281d77-8217-4830-be95-9528227c105c").ExtractErr()
+	th.AssertNoErr(t, err)
+}