xenadmin/XenAdmin/Wizards/NewSRWizard.cs

/* Copyright (c) Cloud Software Group, Inc. 
 * 
 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met: 
 * 
 * *   Redistributions of source code must retain the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer. 
 * *   Redistributions in binary form must reproduce the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer in the documentation and/or other 
 *     materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using XenAdmin.Actions;
using XenAdmin.Core;
using XenAdmin.Network;
using XenAdmin.Wizards.GenericPages;
using XenAPI;
using XenAdmin.Dialogs;
using XenAdmin.Wizards.NewSRWizard_Pages;
using XenAdmin.Wizards.NewSRWizard_Pages.Frontends;
using XenAdmin.Controls;
using XenAdmin.Actions.DR;

namespace XenAdmin.Wizards
{
    public partial class NewSRWizard : XenWizardBase
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        #region Wizard pages
        private readonly NewSrWizardNamePage xenTabPageSrName;
        private readonly CIFS_ISO xenTabPageCifsIso;
        private readonly CifsFrontend xenTabPageCifs;
        private readonly VHDoNFS xenTabPageVhdoNFS;
        private readonly NFS_ISO xenTabPageNfsIso;
        private readonly LVMoISCSI xenTabPageLvmoIscsi;
        private readonly LVMoHBA xenTabPageLvmoHba;
        private readonly LVMoFCoE xenTabPageLvmoFcoe;
        private readonly LVMoHBASummary xenTabPageLvmoHbaSummary;
        private readonly ChooseSrTypePage xenTabPageChooseSrType;
        private readonly ChooseSrProvisioningPage xenTabPageChooseSrProv;
        private readonly RBACWarningPage xenTabPageRbacWarning;
        #endregion

        /// <summary>
        /// The final action for this wizard is handled in this class, but the front end pages sometimes need to know when it's done so they
        /// allow the user to leave them.
        /// </summary>
        public AsyncAction FinalAction;

        private readonly string m_text;

        // For SR Reconfiguration
        private readonly SR _srToReattach;
        private SrWizardType m_srWizardType;

        private readonly bool _rbac;

        private bool showProvisioningPage;

        public NewSRWizard(IXenConnection connection)
            : this(connection, null)
        {
        }

        public NewSRWizard(IXenConnection connection, SR srToReattach)
            : this(connection, srToReattach, false)
        {
        }

        internal NewSRWizard(IXenConnection connection, SR srToReattach, bool disasterRecoveryTask)
            : base(connection)
        {
            InitializeComponent();

            xenTabPageSrName = new NewSrWizardNamePage();
            xenTabPageCifsIso = new CIFS_ISO();
            xenTabPageCifs = new CifsFrontend();
            xenTabPageVhdoNFS = new VHDoNFS();
            xenTabPageNfsIso = new NFS_ISO();
            xenTabPageLvmoIscsi = new LVMoISCSI();
            xenTabPageLvmoHba = new LVMoHBA();
            xenTabPageLvmoFcoe = new LVMoFCoE();
            xenTabPageLvmoHbaSummary = new LVMoHBASummary();
            xenTabPageChooseSrType = new ChooseSrTypePage();
            xenTabPageChooseSrProv = new ChooseSrProvisioningPage();
            xenTabPageRbacWarning = new RBACWarningPage((srToReattach == null && !disasterRecoveryTask)
                             ? Messages.RBAC_WARNING_PAGE_DESCRIPTION_SR_CREATE
                             : Messages.RBAC_WARNING_PAGE_DESCRIPTION_SR_ATTACH);

            //do not use virtual members in constructor
            var format = (srToReattach == null && !disasterRecoveryTask)
                             ? Messages.NEWSR_TEXT
                             : Messages.NEWSR_TEXT_ATTACH;
            m_text = string.Format(format, Helpers.GetName(xenConnection));

            _srToReattach = srToReattach;
            
            xenTabPageChooseSrType.SrToReattach = srToReattach;
            xenTabPageChooseSrType.DisasterRecoveryTask = disasterRecoveryTask;

            // Order the tab pages
            AddPage(xenTabPageChooseSrType);
            AddPage(xenTabPageSrName);
            AddPage(new XenTabPage {Text = Messages.NEWSR_LOCATION});

            // RBAC warning page 
            _rbac = (xenConnection != null && !xenConnection.Session.IsLocalSuperuser) &&
                   Helpers.GetCoordinator(xenConnection).external_auth_type != Auth.AUTH_TYPE_NONE;            
            if (_rbac)
            {
                // if reattaching, add "Permission checks" page after "Name" page, otherwise as first page (Ref. CA-61525)
                if (_srToReattach != null)
                    AddAfterPage(xenTabPageSrName, xenTabPageRbacWarning);
                else
                    AddPage(xenTabPageRbacWarning, 0);
                ConfigureRbacPage(disasterRecoveryTask);
            }
        }

        private void ConfigureRbacPage(bool disasterRecoveryTask)
        {
            if (!_rbac)
                return;

            xenTabPageRbacWarning.Connection = xenConnection;

            var warningMessage = _srToReattach == null && !disasterRecoveryTask
                             ? Messages.RBAC_WARNING_SR_WIZARD_CREATE
                             : Messages.RBAC_WARNING_SR_WIZARD_ATTACH;

            var check = new WizardRbacCheck(warningMessage) { Blocking = true };
            check.AddApiMethods("SR.probe");

            if (Helpers.KolkataOrGreater(xenConnection) && !Helpers.FeatureForbidden(xenConnection, Host.CorosyncDisabled))
                check.AddApiMethods("SR.probe_ext");

            if (_srToReattach == null)
            {
                // create
                check.AddApiMethods(SrCreateAction.StaticRBACDependencies);
            }
            else if (disasterRecoveryTask && SR.SupportsDatabaseReplication(xenConnection, _srToReattach))
            {
                // "Attach SR needed for DR" case
                check.AddApiMethods(DrTaskCreateAction.StaticRBACDependencies);
            } 
            else 
            {
                // reattach
                check.AddApiMethods(SrReattachAction.StaticRBACDependencies);
            }

            xenTabPageRbacWarning.SetPermissionChecks(xenConnection, check);
        }

        private bool SetFCDevicesOnLVMoHBAPage(LVMoHBA page)
        {
            List<FibreChannelDevice> devices;
            var success = page.FiberChannelScan(this, xenConnection, out devices);
            page.FCDevices = devices;
            return success;
        }

        private bool CanShowLVMoHBASummaryPage(List<FibreChannelDescriptor> SrDescriptors)
        {
            string description = m_srWizardType.Description;
            string name = m_srWizardType.SrName;

            List<string> names = xenConnection.Cache.SRs.Select(sr => sr.Name()).ToList();

            m_srWizardType.SrDescriptors.Clear();
            foreach (var descriptor in SrDescriptors)
            {
                descriptor.Name = name;
                if (!string.IsNullOrEmpty(description))
                    descriptor.Description = description;

                m_srWizardType.SrDescriptors.Add(descriptor);
                m_srWizardType.IsGfs2 = descriptor is Gfs2HbaSrDescriptor || descriptor is Gfs2FcoeSrDescriptor;
                names.Add(name);
                name = SrWizardHelpers.DefaultSRName(m_srWizardType is SrWizardType_Hba 
                                                        ? Messages.NEWSR_HBA_DEFAULT_NAME
                                                        : Messages.NEWSR_FCOE_DEFAULT_NAME, names);
            }

            xenTabPageLvmoHbaSummary.SuccessfullyCreatedSRs.Clear();
            xenTabPageLvmoHbaSummary.FailedToCreateSRs.Clear();

            RunFinalAction(out var closeWizard);
            return closeWizard;
        }

        protected override bool RunNextPagePrecheck(XenTabPage senderPage)
        {
            var runPrechecks = showProvisioningPage
                ? senderPage == xenTabPageChooseSrProv
                : (_srToReattach != null && _rbac
                    ? senderPage == xenTabPageRbacWarning
                    : senderPage == xenTabPageSrName);

            if (runPrechecks)
            {
                if (m_srWizardType is SrWizardType_Fcoe)
                {
                    xenTabPageLvmoFcoe.SrType = showProvisioningPage && xenTabPageChooseSrProv.IsGfs2 ? SR.SRTypes.gfs2 : SR.SRTypes.lvmofcoe;
                    return SetFCDevicesOnLVMoHBAPage(xenTabPageLvmoFcoe);
                }
                if (m_srWizardType is SrWizardType_Hba)
                {
                    xenTabPageLvmoHba.SrType = showProvisioningPage && xenTabPageChooseSrProv.IsGfs2 ? SR.SRTypes.gfs2 : SR.SRTypes.lvmohba;
                    return SetFCDevicesOnLVMoHBAPage(xenTabPageLvmoHba);
                }
            }
			
			if (senderPage == xenTabPageLvmoFcoe)
            {
                return CanShowLVMoHBASummaryPage(xenTabPageLvmoFcoe.SrDescriptors);
            }

            if (m_srWizardType is SrWizardType_Hba)
            {
                if (senderPage == xenTabPageLvmoHba)
                {
                    return CanShowLVMoHBASummaryPage(xenTabPageLvmoHba.SrDescriptors);
                }
            }
            return base.RunNextPagePrecheck(senderPage);
        }
     
        protected override void UpdateWizardContent(XenTabPage senderPage)
        {
            var senderPagetype = senderPage.GetType();

            if (senderPagetype == typeof(ChooseSrTypePage))
            {
                #region
                showProvisioningPage = false;
                RemovePagesFrom(_rbac ? 3 : 2);
                m_srWizardType = xenTabPageChooseSrType.SrWizardType;

                if (m_srWizardType is SrWizardType_VhdoNfs)
                    AddPage(xenTabPageVhdoNFS);
                else if (m_srWizardType is SrWizardType_Iscsi)
                {
                    showProvisioningPage = Helpers.KolkataOrGreater(xenConnection) &&
                                   !Helpers.FeatureForbidden(xenConnection, Host.RestrictCorosync);
                    if (showProvisioningPage)
                        AddPage(xenTabPageChooseSrProv);
                    AddPage(xenTabPageLvmoIscsi);
                }
                else if (m_srWizardType is SrWizardType_Hba)
                {
                    showProvisioningPage = Helpers.KolkataOrGreater(xenConnection) &&
                                   !Helpers.FeatureForbidden(xenConnection, Host.RestrictCorosync);
                    if (showProvisioningPage)
                        AddPage(xenTabPageChooseSrProv);
                    AddPage(xenTabPageLvmoHba);
                    AddPage(xenTabPageLvmoHbaSummary);
                }
                else if (m_srWizardType is SrWizardType_Fcoe)
                {
                    AddPage(xenTabPageLvmoFcoe);
                    AddPage(xenTabPageLvmoHbaSummary);
                }
                else if (m_srWizardType is SrWizardType_CifsIso)
                    AddPage(xenTabPageCifsIso);
                else if (m_srWizardType is SrWizardType_Cifs)
                    AddPage(xenTabPageCifs);
                else if (m_srWizardType is SrWizardType_NfsIso)
                    AddPage(xenTabPageNfsIso);

                xenTabPageSrName.SrWizardType = m_srWizardType;
                xenTabPageSrName.MatchingFrontends = xenTabPageChooseSrType.MatchingFrontends;

                NotifyNextPagesOfChange(xenTabPageSrName);
                #endregion
            }
            else if (senderPagetype == typeof(NewSrWizardNamePage))
            {
                #region
                m_srWizardType.SrName = xenTabPageSrName.SrName;
                m_srWizardType.Description = xenTabPageSrName.SrDescription;
                m_srWizardType.AutoDescriptionRequired = xenTabPageSrName.AutoDescriptionRequired;

                if (m_srWizardType is SrWizardType_VhdoNfs)
                    xenTabPageVhdoNFS.SrWizardType = m_srWizardType;
                else if (m_srWizardType is SrWizardType_Iscsi)
                    xenTabPageLvmoIscsi.SrWizardType = m_srWizardType;
                else if (m_srWizardType is SrWizardType_Hba)
                    xenTabPageLvmoHba.SrWizardType = m_srWizardType;
                else if (m_srWizardType is SrWizardType_CifsIso)
                    xenTabPageCifsIso.SrWizardType = m_srWizardType;
                else if (m_srWizardType is SrWizardType_NfsIso)
                    xenTabPageNfsIso.SrWizardType = m_srWizardType;
                else if (m_srWizardType is SrWizardType_Cifs)
                    xenTabPageCifs.SrWizardType = m_srWizardType;
                else if (m_srWizardType is SrWizardType_Fcoe)
                    xenTabPageLvmoFcoe.SrWizardType = m_srWizardType;
                #endregion
            }
            else if (senderPagetype == typeof(ChooseSrProvisioningPage))
            {
                var isGfs2 = xenTabPageChooseSrProv.IsGfs2;
                xenTabPageLvmoHba.SrType = isGfs2 ? SR.SRTypes.gfs2 : SR.SRTypes.lvmohba;
                xenTabPageLvmoFcoe.SrType = isGfs2 ? SR.SRTypes.gfs2 : SR.SRTypes.lvmofcoe;
                xenTabPageLvmoIscsi.SrType = isGfs2 ? SR.SRTypes.gfs2 : SR.SRTypes.lvmoiscsi;
            }
            else if (senderPagetype == typeof(CIFS_ISO))
            {
                m_srWizardType.DeviceConfig = xenTabPageCifsIso.DeviceConfig;
                SetCustomDescription(m_srWizardType, xenTabPageCifsIso.SrDescription);
            }
            else if (senderPagetype == typeof(CifsFrontend))
            {
                m_srWizardType.UUID = xenTabPageCifs.UUID;
                m_srWizardType.DeviceConfig = xenTabPageCifs.DeviceConfig;
                SetCustomDescription(m_srWizardType, xenTabPageCifs.SrDescription);
            }
            else if (senderPagetype == typeof(LVMoISCSI))
            {
                SetCustomDescription(m_srWizardType, xenTabPageLvmoIscsi.SrDescription);

                m_srWizardType.UUID = xenTabPageLvmoIscsi.UUID;
                m_srWizardType.DeviceConfig = xenTabPageLvmoIscsi.DeviceConfig;
                m_srWizardType.IsGfs2 = xenTabPageLvmoIscsi.SrType == SR.SRTypes.gfs2;
            }
            else if (senderPagetype == typeof(NFS_ISO))
            {
                m_srWizardType.DeviceConfig = xenTabPageNfsIso.DeviceConfig;
                SetCustomDescription(m_srWizardType, xenTabPageNfsIso.SrDescription);
            }
            else if (senderPagetype == typeof(VHDoNFS))
            {
                m_srWizardType.UUID = xenTabPageVhdoNFS.UUID;
                m_srWizardType.DeviceConfig = xenTabPageVhdoNFS.DeviceConfig;
                SetCustomDescription(m_srWizardType, xenTabPageVhdoNFS.SrDescription);
            }
        }

        private static void SetCustomDescription(SrWizardType srwizardtype, string description)
        {
            if (srwizardtype.Description == null)
                srwizardtype.Description = description;
        }

        protected override void FinishWizard()
        {
            if (m_srWizardType is SrWizardType_Hba || m_srWizardType is SrWizardType_Fcoe)
            {
                base.FinishWizard();
                return;
            }

            bool closeWizard;
            RunFinalAction(out closeWizard);
            if (closeWizard)
                base.FinishWizard();
        }

        private void RunFinalAction(out bool closeWizard)
        {
            FinalAction = null;
            closeWizard = false;

            // Override the WizardBase: try running the SR create/attach. If it succeeds, close the wizard.
            // Otherwise show the error and allow the user to adjust the settings and try again.
            Pool pool = Helpers.GetPoolOfOne(xenConnection);
            if (pool == null)
            {
                log.Error("New SR Wizard: Pool has disappeared");
                using (var dlg = new WarningDialog(string.Format(Messages.NEW_SR_CONNECTION_LOST, Helpers.GetName(xenConnection))))
                {
                    dlg.ShowDialog(this);
                }

                closeWizard = true;
                return;
            }

            Host coordinator = xenConnection.Resolve(pool.master);
            if (coordinator == null)
            {
                log.Error("New SR Wizard: Coordinator has disappeared");
                using (var dlg = new WarningDialog(string.Format(Messages.NEW_SR_CONNECTION_LOST, Helpers.GetName(xenConnection))))
                {
                    dlg.ShowDialog(this);
                }

                closeWizard = true;
                return;
            }

            if (_srToReattach != null && _srToReattach.HasPBDs() && _srToReattach.Connection == xenConnection)
            {
                // Error - cannot reattach attached SR
                MessageBox.Show(this,
                    String.Format(Messages.STORAGE_IN_USE, _srToReattach.Name(), Helpers.GetName(xenConnection)),
                    Text, MessageBoxButtons.OK, MessageBoxIcon.Error);

                FinishCanceled();
                return;
            }

            // show warning prompt if required
            if (!AskUserIfShouldContinue())
            {
                FinishCanceled();
                return;
            }

            List<AsyncAction> actionList = GetActions(coordinator, m_srWizardType.DisasterRecoveryTask);

            if (actionList.Count == 1)
                FinalAction = actionList[0];
            else
                FinalAction = new ParallelAction(Messages.NEW_SR_WIZARD_FINAL_ACTION_TITLE,
                    Messages.NEW_SR_WIZARD_FINAL_ACTION_START,
                    Messages.NEW_SR_WIZARD_FINAL_ACTION_END, actionList, xenConnection);

            // if this is a Disaster Recovery Task, it could be either a "Find existing SRs" or an "Attach SR needed for DR" case
            if (m_srWizardType.DisasterRecoveryTask)
            {
                closeWizard = true;
                return;
            }

            ProgressBarStyle progressBarStyle = FinalAction is SrIntroduceAction ? ProgressBarStyle.Blocks : ProgressBarStyle.Marquee;
            using (var dialog = new ActionProgressDialog(FinalAction, progressBarStyle) {ShowCancel = true})
            {
                if (m_srWizardType is SrWizardType_Hba || m_srWizardType is SrWizardType_Fcoe)
                {
                    ActionProgressDialog closureDialog = dialog;
                    // close dialog even when there's an error for HBA SR type as there will be the Summary page displayed.
                    FinalAction.Completed +=
                        s => Program.Invoke(Program.MainWindow, () =>
                        {
                            if (closureDialog != null)
                                closureDialog.Close();
                        });
                }
                dialog.ShowDialog(this);
            }

            if (m_srWizardType is SrWizardType_Hba || m_srWizardType is SrWizardType_Fcoe)
            {
                foreach (var asyncAction in actionList)
                {
                    AddActionToSummary(asyncAction);
                }
            }

            if (!FinalAction.Succeeded && FinalAction is SrReattachAction && _srToReattach.HasPBDs())
            {
                // reattach failed. Ensure PBDs are now unplugged and destroyed.
                using (var dialog = new ActionProgressDialog(new DetachSrAction(_srToReattach, true), progressBarStyle))
                {
                    dialog.ShowCancel = false;
                    dialog.ShowDialog();
                }
            }

            // If action failed and frontend wants to stay open, just return
            if (!FinalAction.Succeeded)
            {
                DialogResult = DialogResult.None;
                FinishCanceled();

                if (m_srWizardType.AutoDescriptionRequired)
                {
                    foreach (var srDescriptor in m_srWizardType.SrDescriptors)
                    {
                        srDescriptor.Description = null;
                    }
                }

                return;
            }

            // Close wizard
            closeWizard = true;
        }

        private Dictionary<AsyncAction, SrDescriptor> actionSrDescriptorDict = new Dictionary<AsyncAction, SrDescriptor>();

        void AddActionToSummary(AsyncAction action)
        {
            if (action == null)
                return;

            SrDescriptor srDescriptor;
            actionSrDescriptorDict.TryGetValue(action, out srDescriptor);

            if (srDescriptor == null)
                return;

            if (action.Succeeded)
                xenTabPageLvmoHbaSummary.SuccessfullyCreatedSRs.Add(srDescriptor);
            else
                xenTabPageLvmoHbaSummary.FailedToCreateSRs.Add(srDescriptor);
        }

        private List<AsyncAction> GetActions(Host coordinator, bool disasterRecoveryTask)
        {
            // Now we need to decide what to do.
            // This will be one off create, introduce, reattach

            List<AsyncAction> finalActions = new List<AsyncAction>();
            actionSrDescriptorDict.Clear();

            foreach (var srDescriptor in m_srWizardType.SrDescriptors)
            {
                var srType = srDescriptor is FibreChannelDescriptor ? (srDescriptor as FibreChannelDescriptor).SrType : m_srWizardType.Type;
                if (String.IsNullOrEmpty(srDescriptor.UUID))
                {
                    // Don't need to show any warning, as the only destructive creates
                    // are in iSCSI and HBA, where they show their own warning
                    finalActions.Add(new SrCreateAction(xenConnection, coordinator,
                                                        srDescriptor.Name,
                                                        srDescriptor.Description,
                                                        srType,
                                                        m_srWizardType.ContentType,
                                                        srDescriptor.DeviceConfig,
                                                        srDescriptor.SMConfig));
                }
                else if (_srToReattach == null || _srToReattach.Connection != xenConnection)
                {
                    // introduce
                    if (disasterRecoveryTask &&
                        (_srToReattach == null || SR.SupportsDatabaseReplication(xenConnection, _srToReattach)))
                    {
                        // "Find existing SRs" or "Attach SR needed for DR" cases
                        ScannedDeviceInfo deviceInfo = new ScannedDeviceInfo(srType,
                                                                             srDescriptor.DeviceConfig,
                                                                             srDescriptor.UUID);
                        finalActions.Add(new DrTaskCreateAction(xenConnection, deviceInfo));
                    }
                    else
                        finalActions.Add(new SrIntroduceAction(xenConnection,
                                                               srDescriptor.UUID,
                                                               srDescriptor.Name,
                                                               srDescriptor.Description,
                                                               srType,
                                                               m_srWizardType.ContentType,
                                                               srDescriptor.DeviceConfig));
                }
                else
                {
                    // Reattach
                    if (disasterRecoveryTask && SR.SupportsDatabaseReplication(xenConnection, _srToReattach))
                    {
                        // "Attach SR needed for DR" case
                        ScannedDeviceInfo deviceInfo = new ScannedDeviceInfo(_srToReattach.GetSRType(true),
                                                                             srDescriptor.DeviceConfig,
                                                                             _srToReattach.uuid);
                        finalActions.Add(new DrTaskCreateAction(xenConnection, deviceInfo));
                    }
                    else
                        finalActions.Add(new SrReattachAction(_srToReattach,
                                                              srDescriptor.Name,
                                                              srDescriptor.Description,
                                                              srDescriptor.DeviceConfig));
                }

                AsyncAction action = finalActions.Last();
                if (!actionSrDescriptorDict.ContainsKey(action))
                    actionSrDescriptorDict.Add(action, srDescriptor);
            }

            return finalActions;
        }

        private bool AskUserIfShouldContinue()
        {
            if (!Program.RunInAutomatedTestMode && !String.IsNullOrEmpty(m_srWizardType.UUID))
            {
                if (_srToReattach == null)
                {
                    // introduce
                    if (m_srWizardType.ShowIntroducePrompt)
                    {
                        DialogResult dialogResult;
                        using (var dlg = new WarningDialog(string.Format(Messages.NEWSR_MULTI_POOL_WARNING, BrandManager.BrandConsole, m_srWizardType.UUID),
                                ThreeButtonDialog.ButtonYes,
                                new ThreeButtonDialog.TBDButton(Messages.NO_BUTTON_CAPTION, DialogResult.No, selected: true))
                            {WindowTitle = Text})
                        {
                            dialogResult = dlg.ShowDialog(this);
                        }
                        return DialogResult.Yes == dialogResult;
                    }

                }
                else if (_srToReattach.Connection == xenConnection)
                {
                    // Reattach
                    if (m_srWizardType.ShowReattachWarning)
                    {
                        DialogResult dialogResult;
                        using (var dlg = new WarningDialog(string.Format(Messages.NEWSR_MULTI_POOL_WARNING, BrandManager.BrandConsole, _srToReattach.Name()),
                            ThreeButtonDialog.ButtonYes,
                            new ThreeButtonDialog.TBDButton(Messages.NO_BUTTON_CAPTION, DialogResult.No, selected: true))
                            {WindowTitle = Text})
                        {
                            dialogResult = dlg.ShowDialog(this);
                        }
                        return DialogResult.Yes == dialogResult;
                    }
                }
                else
                {
                    // uuid != null
                    // _srToReattach != null
                    // _srToReattach.Server.IsDetached
                    // _srToReattach.Connection != current connection

                    // Warn user SR is already attached to other pool, and then introduce to this pool 

                    DialogResult dialogResult;
                        using (var dlg = new WarningDialog(string.Format(Messages.ALREADY_ATTACHED_ELSEWHERE, _srToReattach.Name(), Helpers.GetName(xenConnection), Text, BrandManager.BrandConsole),
                        ThreeButtonDialog.ButtonOK,
                        ThreeButtonDialog.ButtonCancel))
                        {
                            dialogResult = dlg.ShowDialog(this);
                        }
                    return DialogResult.OK == dialogResult;
                }
            }

            return true;
        }

        protected override void OnShown(EventArgs e)
        {
            base.OnShown(e);
            
            Text = m_text; //set here; do not set virtual members in constructor

            if (_srToReattach == null)
                return;

            if (xenTabPageChooseSrType.MatchingFrontends <= 0)
            {
                using (var dlg = new ErrorDialog(string.Format(Messages.CANNOT_FIND_SR_WIZARD_TYPE,
                    _srToReattach.type, BrandManager.BrandConsole)))
                    dlg.ShowDialog(this);

                Close();
            }
            else if (xenTabPageChooseSrType.MatchingFrontends == 1)
            {
                // move to "Name" page
                NextStep();               
                // move to "Location" page or "Permission checks" page
                NextStep();
                // if rbac, stay on this page (Ref. CA-61525)
                if (_rbac)
                    return;
            }
        }

        protected override string WizardPaneHelpID()
        {
            return CurrentStepTabPage is RBACWarningPage ? FormatHelpId("Rbac") : base.WizardPaneHelpID();
        }

        public void CheckNFSISORadioButton()
        {
            xenTabPageChooseSrType.PreselectNewSrWizardType(typeof(SrWizardType_NfsIso));
        }

    }
}