This How To article walks you through the process of merging files from two branches that are not related to one another. The process of merging items that are not directly branched from each other is called a baseless merge. To perform a baseless merge, you must use the Tf merge command. You cannot perform a baseless merge operation from Visual Studio.
Contents
Objectives
Overview
Summary of Steps
Step 1 – Evaluate Whether a Baseless Merge Is Needed
Step 2 – Perform a Baseless Merge Using Tf.exe
Step 3 – Resolve Merge Conflicts
Step 4 – Check-In the Merged Changes
Additional Resources
Objectives
Learn how to decide if a baseless merge is necessary
Perform a baseless merge and resolve merge conflicts
Overview
The process of merging items that are not directly branched from each other is called a baseless merge. For example, you might want to merge a change between two release branches, which are siblings of each other, without merging up to the parent branch. You can only perform a baseless merge by using the Tf merge command. You cannot perform a baseless merge from within the Visual Studio IDE.
When you perform a baseless merge, TFS does not have any information about the relationship of the files in the branches. For example, if you have renamed a file, this will be viewed as a deleted file and a new file will be added in the branch. For this reason you have to perform more manual conflict resolutions than when you perform a normal merge. However, you only have to perform this conflict resolution once. After you have performed the baseless merge, TFS records merge history and establishes a relationship between the folders and files.
Summary of Steps
Step 1 – Evaluate Whether a Baseless Merge Is Needed
Step 2 – Perform a Baseless Merge Using Tf.exe
Step 3 – Resolve Merge Conflicts
Step 4 – Check-In the Merged Changes
Step 1 – Evaluate Whether a Baseless Merge Is Needed
In this step, you evaluate the branches and items to be merged to determine if you need to do a baseless merge or whether a regular merge will work.
If you are the owner/administrator of your team project, you will know the relationships between the branches or items. From Visual Studio, you can only merge the branches or items that have a parent-child relationship. If your project contains branches or items that do not have this relationship, you require to perform baseless merge.
If you are not aware of all the relationships between the branches or items, you can evaluate whether you need to use a baseless merge as follows.
Open Source Code Explorer.
Right-click the branched folder and then click Merge.
In the Source Control Merge Wizard dialog box, click the Target branch drop-down list.
If you do not see an entry for the branch you want to merge, this indicates that no merge relationship exists between these branches. In this case you must perform a baseless merge.
Step 2 – Perform a Baseless Merge Using Tf.exe
In this step, you use the TFS command line tool Tf.exe to perform a baseless merge.
To perform a baseless merge:
Set the Workspace for both branches by performing a “Get Latest” operation on the branches to be merged:
Open Source Code Explorer.
Right-click the folder for the first branch to be merged, and click Get Latest Version.
Repeat the previous step for the second branch to be merged.
Note that if no workspace is mapped, Visual Studio prompts you to select a folder on your local drive.
Open a Visual Studio command window.
Run the following Tf.exe command from the command line:
Tf merge /baseless <> <> /recursive
Example
Tf merge /baseless c:\data\proj1 c:\data proj2 /recursive
If you need to merge specific versions of the code changes, you can use the version switch with Tf.exe as follows:
tf merge /baseless <> <> / recursive /version:<>~<>
Example
In this step, you resolve conflicts that might occur when performing a baseless merge. After you run the Tf.exe command, it displays a Resolve Conflicts dialog box with a list of the files that have conflicts.
Select each file and click Resolve.
In the Resolve version conflict dialog box:
If there are no content changes, select the Keep changes in the target branch resolution option and then click OK.
If there are content changes, select the Merge changes in merge tool resolution option, and then click OK.
In the merge tool, click the conflict regions in the upper pane or type in the lower pane to apply changes for each conflicting line.
After you have applied changes for all of the conflicts, click OK in the merge tool.
After all the conflicts have been resolved, click Close.
Step 4 – Check-in the Merged Changes
In this step, you check-in the baseless merged changes
Open Source Code Explorer.
Right-click the target folder in which you have merged the changes and click Check-in pending changes.
In the Check-In Source Files dialog box, ensure that all the files to be checked in are selected.
Click Check In.
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