In TFS, if you want to create a personal branch to try out an idea you
have, you will have to create a branch on the TFS server – even if no
one else needs access to your code. And when you create this branch,
every single file in your project will be duplicated – even if your
branch has very few changes compared to the original one. Now you’re
using twice the amount of disk space both on the server and locally!
Is this true, and one of the downsides of a non-distributed VCS?
Both statements are wrong. (Where did you read this?)
In TFS, if you want to create a personal branch to try out an idea you have, you will have to create a branch on the TFS server
No you don't always need a branch if you're just "trying out an idea". Of course it depends on what you want to do. Saving your work on the server to secure it against drive crashes is what shelvesets are for in TFS (other VCSs may not provide anything similar, which is why you need to create a branch for every idea there). You can even share your code with others without actually checking it in using shelvesets. Even a simple kind of versioning can be done by including the timestamp in the names of the shelvesets, but this is tedious, probably more so than creating a branch ;) Building your code on the server is another thing you can do with shelvesets.
You should read up on when to use shelvesets over changesets on MSDN (there is an article somewhere) to decide whether you need a new branch.
Now you’re using twice the amount of disk space both on the server and locally!
The copying of the code only happens virtually. The SQL Server behind the TFS Server will not use up twice the space, unless every file actually changes on either one of these branches. Until then, both files on the two branches will "point" to the exact same memory on the SQL Server. If you need to work on both branches simultaneously and map them into your workspace, then of course you need twice the amount of space locally. Both is true for any VCS I am aware of, so this is not a TFS-specific issue.
I've used TFS for about 18 months now and I'm really not excited about it. It seems like the worst of the current versions of SCMs on the market.
I think this thread will help people decide if TFS is for them vs. other source control systems. While TFS does a lot more than that, I think that source control is so critical to software development that any system (or combination thereof) that you pick needs to consider source control first.
What are the good things about TFS vs. other source controls -- what does it do well that no one else does?
What are the things that TFS is bad at that everyone else seems to do just fine?
Pros
Fundamentally it's a sound system. Robust and reliable.
Integrated with work items, reporting, etc.
The power tools are really good.
[edit] It is improving, and has taken good jumps forwards with 2010, 2012, 2013
TFS is highly accessible for custom tools. There's a rich API that makes it so easy to write dashboards and other tools to get at the data in TFS. And as all the data is stored in SQL, you can browse it and query it directly if need be. I've worked with many different SCMs over the years and have never found one that is so open and accessible - everything (user stories, tasks, bugs, issues, test plans, iterations, source code control & branches, builds, unit testing, continuous integration) is just there at your fingertips. This is an awesome feature of TFS. A lot of the UI failings of TFS have been addressed in a few afternoons writing tools and a dashboard for my team to use. And let's face it, if you write your own, it does exactly what you need.
Cons
There is one area where the robustness fails miserably: If you apply several changes to a file (add, rename, edit) in "one go" it gets horribly confused. If you don't check in these actions separately, both TFS2005 and TFS2008 crash when you go to merge those changes across branches. In 2010 onwards it no longer crashes, but it often doesn't correctly check in the changes, so you have to go in and clean up a mess of missing and incorrectly named files.
There is no standalone source control browser. It's integrated into VS, which is really annoying when you want to just work on source control items without needing to run up another copy of VS. Of course, you can give your artist a Team Explorer, but let's ask ourselves if an artist who only ever wants to view the files, check out, check in, and GLV really needs a fully blown complicated VSTS instance running to achieve it? In addition, the integration is so poor that you can't realistically use TFS from the Solution explorer (it simply lies about what you have checked out, and is so unreliable when you apply actions from that window that you soon learn to open the source control window and work in there, which defeats the point of it being integrated in the first place) [edit: The file explorer extension is excellent - close to a standalone browser - and is simple and easy to use. The main drawback of it is lack of proper integration with file commands - to rename or delete files you must remember to use the TFS submenu, or you will rename/delete locally and this screws up source control completely as TFS knows nothing of the changes you have made. This unfortunately means that only 'advanced' TFS users can be trusted to use it. So, essentially, it's still a case of "no stand alone browser" for most users]
The user interface sucks (but is improving, at least on the web-access side). Sure, it works, but there is so much that could be done to make it efficient, pleasant, and more foolproof to use. e.g. [prior to 2012] When you click "check in" it ticks all remaining un-checked-in items so that if you accidentally click Check in again in future, it checks in a load of stuff you didn't want to. And after this, it would be so easy to supply an "undo last checkin" option to quickly roll it back - but there isn't one. [Edit: The UI is improved, but these specific problems are still present in VS2010, although it does now have a check-in confirmation dialog that reduces the risk of accidental checkins][edit: in 2012 it's much better, but they've gone mad and rolled all the separate TFS dialogs into a single window, which was a serious step backwards. The pending changes window doesn't work nearly as well as in 2010 - it is harder to find things, it takes more clicks to achieve the same things, and if you check in a file from anywhere all the currently 'included' files get chucked into 'excluded' so if you have several things on the go they all get mixed together]
Workspaces. In most cases, every team member has to have essentially the same workspace mapping, slaved off a local root folder. We need 7 mappings defined, which takes about 5 minutes to set up. There is no way to push the workspace definition from the server. There is no [edit]easy[/edit] way to duplicate a workspace so you can use an existing one (or another users one) as a starting point. No, you have to manually re-enter all the bindings over and over and over and over. If you change your active workspace in the source control explorer, it doesn't get synced to your pending changes window, so you spend 15 minutes wondering why the file you merged from your other branch just isn't listed. [edit: This is getting better with 2010/2012, as you can see workspaces on other PCs and copy and paste them more easily, but it's still a pretty clumsy UI]
It has changesets, but you can't bundle items into separate changesets in your pending checkins list as you can in Perforce, you can only associate them with a changeset by actually checking them in. You can really only work on one changeset at a time, or you have to separate the files out manually in your pending list as you go to check in. [still very poor in 2012]
The merge tools are terrible. As in: they simply don't work, and unnecessarily introduce bugs into your code if you rely on the automatic merge. These tools are just as bad as they were when I first used SourceSafe in 1994. So the first thing you have to do after buying a very costly VSTS licence is replace the merge tools with something that actually works. And that means that every time you get a merge conflict, you must select each file. Choose to resolve the conflict and ok. Choose to use your 3rd party merge tool and ok. Then merge. Then save. Then choose to accept your merged changes. (You should be able to choose "automatic merge" and have it simply use the third party merge tool that actually works without hitting you with a barrage of pointless and annoying dialogs that always default to the wrong option) [Edit: InVS2010 the merge tools are still awful. But the front-end UI is much improved (merging a conflict now takes a single click rather than 4 or 5 clicks - a massive improvement when you have to merge many files][In 2012 there have been further improvements, but they are still 'ok' rather than good]
It doesn't sync between running instances of VS. So if you check in a file in one VS, another one will still list that file in your pending checkins. (it's clearly easy to sync it because any changes made by the power tools windows-explorer extension are reflected in VS instantly). [Edit: In 2012 they have fixed this problem. Now every time you switch to the pending changes view it spends 15 seconds refreshing (in 2010 it cached it and showed it instantly but it was occasionally out of date)]
Branching is the standard way of working these days. So you'd expect the branch/merge tools to make this quick and easy. But no. [edit: Big improvements were made in 2010 and 2012, but merging is terribly supported - it is really labour intensive. Just little things like only being able to merge a contiguous set of changes, so if you want to merge 5 changes that are not contiguous you have to do them one by one, but each time you open the dialog it starts from scratch instead of remembering where you were, what you last merged, the list of availablke changesets, etc. You should be able to select any changesets you want and it should automate the rest]
If you GLV (get latest version of) a solution, and some of the projects in it have been changed, VS repeatedly asks if you wish to reload each changed project. It is about 10x faster to close your solution, then GLV, then open the solution again than to GLV with it open. If I'm GLV'ing then of course I want to reload the projects! When I buy my food at the supermarket they don't ask me for every item "do you wish to take this item home with you?". [Edit: Still broken in VS2010][Fixed in 2012. Hurrah!]
[edit] If two team members add a new project to a solution, then when the second person goes to check in, they must (obviously) resolve a merge conflict. However, TFS treats the .sln as a text file, and corrupts it (it adds the two project entries but the project count is effectively only incremented once). It would be so easy to fix the sln format to make the files mergeable.
[edit] I don't do any source control operations from within the Solution Explorer window, as it has been rather unreliable ever since "integration" first came along. Even in 2008 it usually has random "checked out" icons on files that are not checked out, and recursive operations sometimes do weird things. Almost every source control 'glitch' we have is a result of someone starting an operation from the Solution Explorer. Luckily, I prefer to work in a Source Control window anyway.[2012: Sorry, can't tell you if this is fixed, as I haven't used this feature since 2008]
[edit] Where to start with the Source Control Bindings window? VS could say "Your Source Control settings have been corrupted again for no obvious reason. I never could get the hang of Thursdays. Shall I fix this for you? [YES]", but instead, it shows a complicated, confusing dialog full of information that makes no sense to anybody, resulting in a UI so scary that it makes junior programmers soil themselves. The trick is to ignore the whole window, hide behind your desk and click the "fix it" button, and it fixes it.
[edit - added 12/2010] When you Get source code, especially when resolving merge conflicts, other windows are often brought to the front (either the Solution Explorer jumps in front of my Pending Changes view, which I have docked in the same tabbed area, or the Source Control window vanishes behind another document window. This is really annoying when you have another file to merge or another folder to Get, as you have to keep "finding" the Source Control/Pending Changes windows. Getting code should not constantly reorder my document/tool windows.[2012: Still broken]
[edit - added 1/2014] With TFS 2012/2013, there is a choice of Server or Local workspaces. Server is the name for the old system where you must be online with the server to check files out. Local is the new default and makes a copy of the entire source repository on your computer, allowing you to make edits to any files without needing to check them out first. TFS then diffs your files against its local copy to work out what you changed. This sounds good, and for many people it probably is good, but it has some serious drawbacks that you should be aware of:
As you no longer check out files, they do not get locked when you edit them, and thus several people can edit any given file simultaneously, requiring a merge operation when they check in. This is fine for text-based source code files, but results in difficult situations or lost work when the files are unmergeable. Unmergeable or non-automatically mergeable files include Solution, Project, Resource (resx), XAML and any other XML files - so this causes a lot of problems in a development environment. If (like us) you also want to store Word and Excel documents and binary files under source control, local workspaces are positively dangerous. We have lost several days of work because someone unwittingly used a local workspace and then it was not practicable to merge their changes. You can reconfigure the TFS server to make Server workspaces the default to defend against this.
With Local workspaces you have to keep two copies of everything on your computer. When we upgraded TFS we suddenly found everyone lost 25GB of disk space, and it took several weeks to work out where the disk space had gone! This was a major problem for us because we all use SSDs and it is only now (2014) that SSDs are getting large/cheap enough that we can afford to be so inefficient with our disk space.
In the few weeks that we used local workspaces we had several incidents where TFS corrupted files or lost changes, presumably due to bugs in the implementation. Quite simply, we cannot accept anything less than 100% reliability for our source control system.
TFS is getting much easier to manage; these days if you don't want to customise anything too much you can set up a server in a very short time (hours) and setting up continuous integration builds and backups etc is extremely easy. On the flip side, while I found it very easy to set up backups of a TFS database, restoring that database and getting up and running after our server bricked itself was another matter - it took 4 days to work through all the unnecessary blocking problems (e.g. you have to restore the backup form a network drive, the data can't be local. When I tried to restore the image to the rebuilt server, TFS kept telling me there were no databases that could be restored. When I got past that, TFS wouldn't use the databases because they didn't match the host server (because that server was gone, the OS had been reinstalled). It took a lot of searching and fettling to get the backup to restore. Restoring should "just work"!
As you can see, most of the above are just trivial UI gripes. There is such a lot that could be improved about the UI. But the actual underlying product is good. I prefer TFS to pretty much every other SCM I've used over the last 28 years.
I wouldn't even mind the poor UI so much, except that it is one of the core UIs developers have to use on an hour-by hour basis, and they have to pay such a lot to get it. If the subscription money from a single developer was invested on improving the UI it would make a massive difference to the usability of TFS! It's painful to think that TFS is merely good or ok when it could so easily be excellent with a bit of nice UI.
Hates
Doesn't track changes to files unless you've checked them out, so if you edit a file in Notepad++ TFS is unaware that anything changed.
It's very easy for someone to check out a fille and lock it so that nobody else can make changes. TFS shouldn't drop this ability, but it certainly should make it much harder to do than it is currently.
The methods to undo a commit or two is very unclear, so much so that I'm never quite sure if it worked or not.
The way that TFS makes files read only unless you check them out is obnoxious, though it does help me remember to check files out before I save the edits I've made.
Loves
I suppose built-in integration with visual studio is nice, if you like that kind of thing (I don't)
I am a member of the Team Foundation Server team at Microsoft. There are a lot of very valid issues raised here. Some of them are addressed in the 2010 release. Others remain as issues, but we do recognize them and are working to improve the developer experience with the next release. Discussions like this are great for helping us make sure we're solving the right problems.
Here is some info on issues that are at least partially addressed today in the 2010 version:
Stand alone client
For non-developer customers that want to use the product outside of VS, they can use the Windows Shell extension powertool.
If you have users (developers or not) that need to access TFS from non-Window machines, they can use Team Explorer Everywhere. This is supported on platforms including Mac & Linux.
Copy workspace
There are two ways to copy a workspace today. The 1st is by using the workspace template command at the cmd line. Ex.
Tf /workspace /new /template[workspace name/owner to copy from]
Alternatively, you can open a workspace in the UI, select all of the mappings, copy them, & then paste them into a file/email. Someone else can than paste those same mappings into their workspace.
It would definetly be great if you could simply specify a default workspace that clients automatically pick up, but we don't have this today.
Merging robustness
The scenario described where you do an add, rename, add & then have problems when you merge has been addressed in TFS 2010.
Branch/Merge as a 1st class experience
In TFS 2010, branches are now 1st class objects in TFS. You can visualize your branches & even track changes as they move through the branch. Branching is also now a fast server based operation.
Get Latest Version of multiple projects
You can do this today by choosing the TFS instance node in source control explorer & then selecting get latest. This is the equivalent of the root folder ($).
File locking
By default TFS never locks files when users checks them out. This is the way we use TFS at Microsoft & how we see the majority of our customers using TFS. It is possible to enable users to explicitly lock files. Some customers find this desirable, but it is not the default path experience.
Con: Checkout model. Many applications do not deal well with files that are marked as read-only then change to writable (Word 2007, Notepad). So you open a file, edit the file, try to save then you're told that you can't save because it's read-only. Great, now you have to Save As..., delete the original and renamed the new one to the old name. If there's an upside to having local files be read-only I don't see it. I really prefer Subversion's approach to this.
The one upside to making files read-only is that it reminds you to check them out. However that's really just a symptom of the check-out model.
I think that TFS is the single best ALM product on the market today. Looking at it from only a source control platform is slanted. I have used many products in my career to date: VSS, SVN, Git, StarTeam, CC/Harvest, and ClearCase - apart from TFS. Personally, I cringe at the thought of going back to anything other than TFS.
TFS is an extremely powerful platform. My biggest problem with it is often related to people not knowing how to use it or using it incorrectly. It is not meant to be an application that "just works". Sure, you can use it for basic source control without learning much about it - but if that is all you use it for, then you really are better off using one of the less robust tools out there. In reality, what TFS does not give you is the way to interpret features how you want to. It is specifically built from the ground up to support process and not just be a repository.
Con: Timestamps. There's no way to set TFS to use the remote last-modified timestamp as the local last-modified timestamp. The local file's timestamp only tells me when I got the file. If I get a file that's 2 years old, there's no way to know that based on the local timestamp.
Other source controls that I have used have this ability.
Cons:
workspace version: You can't identify the version of a workspace without doing a recursive search.
terrible offline experience. attrib -r + tfpt online shouldn't be the way to work offline. Give me something like git that allows me to track status, undo and make changes. I'm even fine if it only stores the difference between the workspace version and current.
Merging robustness: a changed file on the server + a local edit on different lines is not a conflict. a writeable file should not be an automatic conflict. The automerge button should NOT exist, because it should never be a scenario.
Workspaces: the idea of being able to rearrange the source structure is just odd, and causes issues. the requirement of having both branches mapped in order to merge is odd. The requirement of having to do an operation multiple times, because my workspace mapping doesn't have a true root folder is wrong.
Full reliance on remote server: There are some nice things about having all these things stored on the server, but really, you could store information locally and then upload it when needed. Keep pending changes, workspace mappings, basic undo history locally, etc.
Pros
Shelvesets: I love these, and wish support for them was brought to the local disk as well (think git stash)
Source control view in VS: It's pretty cool to be able to view the entire repository without downloading it. There are some usability issues, but the overall idea is cool.
Workspaces: yep, both places. While re-arranging a repo is odd, the ability to only download what you need is pretty awesome. I often wish I could choose a root folder and then check box the paths I need, but oh well.
Dislikes:
Using the history to figure out what has been done is cumbersome to say the least. You have to click on every single history entry to see what files were changed, and then you need to go through a context menu to get a diff.
Working while disconnected from the network is a big no-no. Ever heard of working on an airplane?
No Windows Explorer integration for when you work with files outside of VS (think TortoiseSVN).
Process methodologists (configuration managers) love to not allow shared check-outs. This is absolutely horrible for example for config files that you need to modify for testing.
SC gets confused with complex move/delete operations.
SC does not recognize when a checked out file has not changed. For example, service reference updates check out all related files and often regenerate the exact same content. These files should implicitly be removed from check-ins because they just add noise when you look at your changeset later.
Likes:
Shelving.
Anybody guessed which is my favorite SCM system? SVN + TortoiseSVN + VisualSVN :-)
Search functionality is not implemented in TFS 2010 ?
VSS we have search in file; TFS 2008 we have search file ...
Con: If you want to move multiple files to a subfolder of the existing location, you have to do that one at a time. Wow, that's horrible.
The lack of rollback has been my biggest pain point.
The lack of true rollback support and the inability to rename a TFS Project are my two main pet peeves with TFS. Other than that, I've been very happy with it for 2-3 years.
The fact that certain applications do not support in-edit changes from read-only to writable (forcing you to reopen the file in question) is annoying but is really a problem with those specific applications. The fact that a file is read-only while not checked out has certain uses, one of which being that it reminds you to check out the file. It does occasionally, however, lead to confusion when trying to get specific revisions of files. Writable files are not re-downloaded unless you enable a flag, because they're considered local edits.
Let's say I have my TFS team project setup the way I want it, and all the code between my machine and the team project is in sync (i.e. if I do a get latest it says everything is up to date).
What I would like to do is test whether or not I can pull the project back down to my local machine from TFS source control have everything work properly. By work properly, I mean I'm able to build all the projects, run the web sites, etc.
I thought what I could do is just blow away the code on my local machine and then do a get latest. But TFS seems to think that my local machine and TFS are still in sync (this is a bit different from the way Visual Source Safe worked).
In a nutshell, I'm just trying to test whether or not if another developer were to pull this team project down to their machine, that I know the project is setup correctly with all the necessary dependencies, etc. such that the other developer could build and run the project. But since I only have one machine to test this with currently, I need to do this test on the same machine.
The only way I've found to do it is to use "Get specific version" and force it to overwrite existing files, but it seems like if I delete the stuff off my hard drive, it should know when I do a get latest that "hey, the files aren't there anymore, I need to pull them down".
Any ideas on how I can do this? Thanks.
Not withstanding the answer above highlighting the merits of having an automated build process and continuous integration...
The easiest way to validate what you've checked-in is to create a new workspace with the same folder mappings, albeit to a different location on your hard-drive. You can then 'Get Latest' into this new workspace and confirm that everything builds locally, this should prove that:
The correct versions of existing files are in source control
All the required files have actually been added to source control
Alternatively if you'd rather not check-in your changes until you've validated your pending changes, then your best bet is to 'Shelve' all your changes (ticking the box to undo your pending changes), and then 'Unshelve' that shelveset into a new Workspace and do your testing against that instance of the codebase... or even ask a colleague to pull down your shelveset and do the validation (typically this called a 'Buddy Build').
TFS is a little different that VSS in that local workspaces are maintained so that every file doesn't have to be compared with every GET. In addition to removing the code from your development machine, you should also delete your local workspace. Check out "Working with Version Control Workspaces" on MSDN:
http://msdn.microsoft.com/en-us/library/ms181383.aspx
Really, though, the best way to make sure that your code can be pulled down and built easily is to create an automated build in TFS for continuous integration. That way you know immediately if you have done something that would make the solution un-buildable.
Check out the overviews of Team Foundation Build on MSDN:
http://msdn.microsoft.com/en-us/library/ms181710.aspx
The answers above are good. Except it will not completely test you entire scenario. If you have references outside of your solution (such as dll in the GAC, or dll from an SDK installed on your machine), creating a new workspace or deleting and getting latest code won't found those problems.
The only way to make sure is to pull down the code on another computer. If you don't have another computer handy, you can use a Virtual machine.
Do Get Specific Version and specify the latest. This will force TFS to download everything, ignoring the current synchronisation status.
TFS uses your workspace to know what is synched between the server and local.
I don't think there is an option to make Get Latest to behave like you want (Get Specific Version and specifying Latest Version and Overwrite).
What is the best way to create a completely new project in TFS by copying an existing one?
I have an ASP.NET project that will have 50+ "releases" per year. Each release is a distinct entity that needs to remain independent of all others. Once created, I want to make sure that any change to one (the source project or the copy) does not affect the other.
This is for source control only. I do not need to copy any work items.
In the pre-TFS world I would do this by simply copying the folder that contained all of the project files. This had me 90% of the way to the new app, which I could then tailor for the new release. It is very rare that I need to actually add functionality to the base application, and even when I do it never affects existing apps. Is this still possible using TFS, by copying my local folders and then adding the copy into TFS as a new project?
Any suggestions? One branch per release looks like the "standard" way of doing this but I will quickly end up with dozens of branches that really aren't related, and I'd rather keep each new project as it's own distinct project, with no chance of changes in one affecting the other.
Thanks!
Thanks for the responses. I think you've all given me enough insight to get started. Richard, thanks for the detail. I was a bit concerned that it might be too easy to accidentally merge the branches.
There are really two questions here:
1) Is it better to copy/paste or branch?
I'd venture to say that copy/paste is never appropriate. Unless you are very careful (at minimum, run 'tfpt treeclean' immediately before copying), it's likely you'll end up checking in some inappropriate files to the new location. In addition, you will be using up FAR more disk space on the server, since it must store 50+ full copies instead of just diffs.
There is virtually no danger that branches will "accidentally" become comingled down the line. Merging branches back together involves at least 3 deliberate steps: pend the merge (itself a 4-page wizard), then resolve all conflicts, then checkin.
Nor are you likely to get confused as to your place in the tree. TFS uses "path space" branching. That means branches appear to the user as separate physical locations in the source tree, rather than mere version-tags on top of the same path. Since branches look like folders, you can do all the normal folder operations on them: Cloak (don't download them to your local workspace), Permission (in particular, removing someone's Read permission will ensure they can't even see it), Delete or Destroy (when you're truly done with them).
2) When is it appropriate to create a new Team Project?
This is a more complex topic in general. Official guidance. My opinion.
However, I'd say your case is easy: don't do it. Team Projects have a lot of overhead. There is a finite number you can create on a server...ever. Don't forget about other forms of overhead too, like the time it takes for the project admin to port over all your settings, and the time every developer on your team spends reconnecting his Team Explorer.
All for what? The links above go into great detail about the forms of sub-structure that can be created inside a single Team Project. In short, almost anything is possible. The only areas that are somewhat lacking are Team Queries and Build Definitions, which are restricted to a single container folder, and a few settings like Exclusive Checkout which are all-or-nothing. Unless you have a very large or very diverse team, the benefits of separate team projects per release are very unlikely to outweigh the drawbacks.
Of course, if a "release" is a major event that signals a change in your SCM practices , that's a whole other story. New SCM => new process template => new team project. But I doubt you do that 50+ times a year :)
I would recommend using branching. Create a branch for each release from the main branch. As long as you do not merge the branches they will remain independent. Changes to the main branch will only affect releases created after the those changes were made.
You could copy the files and create a new project, but you may run into a couple of problems:
The projects "remember" that they were in TFS, there is a bit of manual work to clean up special files etc.
TFS may slow down when you have many projects, compared with a single project with branches
This might sound obvious but you should only create a new project for a "new project". It sounds like what you are talking about are different versions of the same project.
If you want to maintain separate codebases for previous releases then as the other answerers have said, branching the code is your best option. This works nicely when you want to merge bug fixes from your latest version into older releases too.
However if you really really must have new projects, you still use branching in the same manner.