Custom Check in policy in TFS?

Question

We have some xml files in the our project and whenever we check-in these xml files into TFS, We have make sure before checking-in that we have added those xml files to proprietary application.

Now the new employees more often forget to add files into proprietary application before check-in and this is getting serious...

We want kinda confirmation dialog (a reminder) asking the developers if they have added the xml files into the app. If yes then check-in otherwise keep it checkedout...

Please suggest if such thing is possible and any relevant code or links will be really appreciated.

Answer 1

It's not appropriate to raise UI in a custom check-in policy - the lifecycle of a check-in policy is very short, and they will be evaluated frequently and not necessarily in a UI context or on the UI thread.

Can you determine programmatically whether the appropriate XML files are being checked in? If so, you could create a custom check-in policy that fails if the XML files are not pended for add.

Gated Check-in may be the best solution to this problem: does the build fail if these XML files do not exist - or would unit tests fail if these files are missing? If so, this is a perfect candidate for Gated Check-in, which will prevent these check-ins from occurring.

Answer 2

I would create a custom build template that checks for these xml files. Make it a gated check-in and you've got your solution.

Answer 3

The Evaluate method is supposed to be quick and should not show UI, but there is an event on the policy that triggers when the user interacts with the policy called Activate, this is a good moment to show UI and communicate with the policy. You could do something like this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace JesseHouwing.CheckinPolicies
{
    using System.Windows.Forms;

    using Microsoft.TeamFoundation.Client.Reporting;
    using Microsoft.TeamFoundation.VersionControl.Client;

    [Serializable]
    public class ConfirmPolicy :PolicyBase
    {
        private AffectedTeamProjectsEventHandler _affectedTeamProjectsEventHandler;
        private EventHandler _checkedPendingChangesEventHandler;

        public ConfirmPolicy()
        {
        }

        public void StatusChanged()
        {
            _userconfirmed = false;
            OnPolicyStateChanged(Evaluate());
        }

        public override void Initialize(IPendingCheckin pendingCheckin)
        {
            _affectedTeamProjectsEventHandler = (sender, e) => StatusChanged();
            _checkedPendingChangesEventHandler = (sender, e) => StatusChanged();

            base.Initialize(pendingCheckin);
            _userconfirmed = false;                
            pendingCheckin.PendingChanges.AffectedTeamProjectsChanged += _affectedTeamProjectsEventHandler;
            pendingCheckin.PendingChanges.CheckedPendingChangesChanged += _checkedPendingChangesEventHandler;
        }

        protected override void OnPolicyStateChanged(PolicyFailure[] failures)
        {
            _userconfirmed = false;
            base.OnPolicyStateChanged(Evaluate());
        }

        public override void Activate(PolicyFailure failure)
        {
            if (MessageBox.Show("Confirm the policy?", "Policy Check", MessageBoxButtons.YesNo) == DialogResult.Yes)
            {
                _userconfirmed = true;
                base.OnPolicyStateChanged(Evaluate());
            }
        }

        public override PolicyFailure[] Evaluate()
        {
            if (_userconfirmed == true)
            {
                return new PolicyFailure[0];
            }
            else
            {
                return new PolicyFailure[]{new PolicyFailure("User must confirm", this)};
            }
        }

        public override string Description
        {
            get { throw new NotImplementedException(); }
        }

        public override bool Edit(IPolicyEditArgs policyEditArgs)
        {
            return true;
        }

        public override string Type
        {
            get
            {
                return "User Confirm";
            }
        }

        public override string TypeDescription
        {
            get
            {
                return "User Confirm";
            }
        }

        public override void Dispose()
        {
            this.PendingCheckin.PendingChanges.AffectedTeamProjectsChanged -= _affectedTeamProjectsEventHandler;
            this.PendingCheckin.PendingChanges.CheckedPendingChangesChanged -= _checkedPendingChangesEventHandler;

            base.Dispose();
        }
    }
}

I haven't tested this exact code yet, it might need some tweaking, but this is the general thing to do. Right now it triggers on a change in the files being checked in, but you can subscribe to any of the other events as well (work item changes) or trigger your own evaluation of the project each time Evaluate is called.

Or you can just trigger the confirm once per checkin cycle. it's all up to you. You could even do a "Click to Dismiss" and skip the Messagebox altogether. Just set _userConfirmed=true and fire the PolicyStateChanged event.