Add storage pool resource

This patch adds an experimental resource type for libvirt storage pool.
Currently only directory-based pool are supported.

Fixes dmacvicar#435.

Author: Zeeshan Ali

libvirt/helpers_test.go

@@ -71,6 +71,21 @@ func getResourceFromTerraformState(resourceName string, state *terraform.State)
 
 // ** resource specifics helpers **
 
+// getPoolFromTerraformState lookup pool by name and return the libvirt pool from a terraform state
+func getPoolFromTerraformState(name string, state *terraform.State, virConn libvirt.Connect) (*libvirt.StoragePool, error) {
+	rs, err := getResourceFromTerraformState(name, state)
+	if err != nil {
+		return nil, err
+	}
+
+	pool, err := virConn.LookupStoragePoolByUUIDString(rs.Primary.ID)
+	if err != nil {
+		return nil, err
+	}
+	log.Printf("[DEBUG]:The ID is %s", rs.Primary.ID)
+	return pool, nil
+}
+
 // getVolumeFromTerraformState lookup volume by name and return the libvirt volume from a terraform state
 func getVolumeFromTerraformState(name string, state *terraform.State, virConn libvirt.Connect) (*libvirt.StorageVol, error) {
 	rs, err := getResourceFromTerraformState(name, state)

libvirt/pool.go

@@ -0,0 +1,115 @@
+package libvirt
+
+import (
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/hashicorp/terraform/helper/resource"
+	libvirt "github.com/libvirt/libvirt-go"
+)
+
+const (
+	poolExistsID    = "EXISTS"
+	poolNotExistsID = "NOT-EXISTS"
+)
+
+// poolExists returns "EXISTS" or "NOT-EXISTS" depending on the current pool existence
+func poolExists(virConn *libvirt.Connect, uuid string) resource.StateRefreshFunc {
+	return func() (interface{}, string, error) {
+		pool, err := virConn.LookupStoragePoolByUUIDString(uuid)
+		if err != nil {
+			if err.(libvirt.Error).Code == libvirt.ERR_NO_STORAGE_POOL {
+				log.Printf("Pool %s does not exist", uuid)
+				return virConn, "NOT-EXISTS", nil
+			}
+			log.Printf("Pool %s: error: %s", uuid, err.(libvirt.Error).Message)
+		}
+		if pool != nil {
+			defer pool.Free()
+		}
+		return virConn, poolExistsID, err
+	}
+}
+
+// poolWaitForExists waits for a storage pool to be up and timeout after 5 minutes.
+func poolWaitForExists(virConn *libvirt.Connect, uuid string) error {
+	log.Printf("Waiting for pool %s to be active...", uuid)
+	stateConf := &resource.StateChangeConf{
+		Pending:    []string{poolNotExistsID},
+		Target:     []string{poolExistsID},
+		Refresh:    poolExists(virConn, uuid),
+		Timeout:    1 * time.Minute,
+		Delay:      5 * time.Second,
+		MinTimeout: 3 * time.Second,
+	}
+
+	if _, err := stateConf.WaitForState(); err != nil {
+		log.Printf("%s", err)
+		return fmt.Errorf("unexpected error during pool creation operation. The operation did not complete successfully")
+	}
+	return nil
+}
+
+// poolWaitDeleted waits for a storage pool to be removed
+func poolWaitDeleted(virConn *libvirt.Connect, uuid string) error {
+	log.Printf("Waiting for pool %s to be deleted...", uuid)
+	stateConf := &resource.StateChangeConf{
+		Pending:    []string{poolExistsID},
+		Target:     []string{poolNotExistsID},
+		Refresh:    poolExists(virConn, uuid),
+		Timeout:    1 * time.Minute,
+		Delay:      5 * time.Second,
+		MinTimeout: 3 * time.Second,
+	}
+
+	if _, err := stateConf.WaitForState(); err != nil {
+		log.Printf("%s", err)
+		return fmt.Errorf("unexpected error during pool destroy operation. The pool was not deleted")
+	}
+	return nil
+}
+
+// deletePool deletes the pool identified by `uuid` from libvirt
+func deletePool(client *Client, uuid string) error {
+	virConn := client.libvirt
+	if virConn == nil {
+		return fmt.Errorf(LibVirtConIsNil)
+	}
+
+	pool, err := virConn.LookupStoragePoolByUUIDString(uuid)
+	if err != nil {
+		return fmt.Errorf("error retrieving storage pool info: %s", err)
+	}
+
+	poolName, err := pool.GetName()
+	if err != nil {
+		return fmt.Errorf("error retrieving storage pool name: %s", err)
+	}
+	client.poolMutexKV.Lock(poolName)
+	defer client.poolMutexKV.Unlock(poolName)
+
+	info, err := pool.GetInfo()
+	if err != nil {
+		return fmt.Errorf("error retrieving storage pool info: %s", err)
+	}
+
+	if info.State != libvirt.STORAGE_POOL_INACTIVE {
+		err := pool.Destroy()
+		if err != nil {
+			return fmt.Errorf("error deleting storage pool: %s", err)
+		}
+	}
+
+	err = pool.Delete(0)
+	if err != nil {
+		return fmt.Errorf("error deleting storage pool: %s", err)
+	}
+
+	err = pool.Undefine()
+	if err != nil {
+		return fmt.Errorf("error deleting storage pool: %s", err)
+	}
+
+	return poolWaitDeleted(client.libvirt, uuid)
+}

libvirt/provider.go

@@ -23,6 +23,7 @@ func Provider() terraform.ResourceProvider {
 			"libvirt_domain":         resourceLibvirtDomain(),
 			"libvirt_volume":         resourceLibvirtVolume(),
 			"libvirt_network":        resourceLibvirtNetwork(),
+			"libvirt_pool":           resourceLibvirtPool(),
 			"libvirt_cloudinit_disk": resourceCloudInitDisk(),
 			"libvirt_ignition":       resourceIgnition(),
 		},