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  1. Version control
  2. Git
  3. Apply changes from one Git branch to another

Apply changes from one Git branch to another

Last modified: 09 August 2022

In Git, there are several ways to integrate changes from one branch into another:

Merge branches

Suppose you have created a feature branch to work on a specific task, and want to integrate the results of your work into the main code base after you have completed and tested your feature:

feature branch diagram

Merging your branch into master is the most common way to do this.

It is very common that while you are working in your feature branch, your teammates continue to commit their work to master:

feature branch diverged from master

When you run merge, the changes from your feature branch are integrated into the HEAD of the target branch:

merge result

Git creates a new commit (M) that is referred to as a merge commit that results from combining the changes from your feature branch and master from the point where the two branches diverged.

Merge branches

  1. In the Branches popup (main menu Git | Branches) or in the Branches pane of the Git tool window, select the target branch that you want to integrate the changes to, and choose Checkout from the context menu to switch to that branch.

  2. Do one of the following:

    • If you do not need to specify options for the merge, select the branch that you want to merge into the current branch and choose Merge into Current from the submenu.

    • If you need to specify merge options, from the main menu choose VCS Git | Merge Changes to open the Merge dialog:

      The Merge dialog

      Select the branch that you want to merge into the current branch, click Modify options and choose from the following:

      • --no-ff: a merge commit will be created in all cases, even if the merge could be resolved as a fast-forward.

      • --ff-only: the merge will be resolved only if it is possible to fast-forward.

      • --squash: a single commit with all pulled changes will be created on top of the current branch.

      • -m: you will be able to edit the message for the merge commit.

      • --no-commit: a merge will be performed, but a merge commit will not be created so that you can inspect the result of the merge before committing.

    Click Merge.

If your working tree is clean (which means you have no uncommitted changes), and no conflicts occur between your feature branch and the target branch, Git will merge the two branches, and the merge commit will appear in the Log tab of the Git tool window Alt+9:

merge commit

If conflicts occur between your branch and the target branch, you will be prompted to resolve them (see Resolve conflicts). If there are unresolved conflicts left after a merge, the Merge Conflicts node will appear in the corresponding changelist in the Local Changes view with a link to resolve them.

If you have local changes that will be overwritten by merge, RubyMine will suggest performing Smart merge. If you select this option, RubyMine will stash uncommitted changes, perform merge, and then unstash the changes.

note

You can cancel an unfinished merge operation by selecting the Abort action from the Git Branches popup.

Rebase branches (git-rebase)

When you rebase a branch onto another branch, you apply the commits from the first branch on top of the HEAD commit in the second branch.

Suppose you have created a feature branch to work on a specific task and make several commits to that branch:

feature branch

While you develop in your branch, your teammates continue to commit their work to master:

feature branch diverged from master

When you perform the rebase operation you integrate changes you have done in your feature branch to the master branch by applying your commits on top of the current HEAD commit in master:

rebase operation result

Rebase a branch on top of another branch

  1. From the main menu select Git | Rebase:

    Git rebase dialog

  2. From the list, select the target branch onto which you want to rebase the current branch:

    Choose target branch in the Git rebase dialog

  3. If you need to rebase the source branch starting from a particular commit instead of rebasing the entire branch, click Modify options and choose --onto. In the source branch field, enter the hash of the commit starting from which you want to apply the current branch to the new base:

    Specify commit hash with --onto

    tip

    To copy a commit hash, select it in the Log, right-click it and choose Copy Revision Number.

  4. If the branch you want to rebase is not currently checked out, click Modify options, click Select another branch to rebase, and choose a branch from the list that appears:

    Choose the branch you want to rebase

    RubyMine will check out this branch before starting the rebase operation.

  5. If you want to rebase all commits reachable in the branch, click Modify options and choose --root (for more information on this option, see git-rebase).

  6. If you need to keep empty commits, which are commits that do not change anything from their parent, click Modify options and choose --keep-empty (for more information on this option, see git-rebase).

  7. If you want to preserve merge commits during the rebase for the sake of keeping them in the branch history, click Modify options and choose --preserve-merges (this option is unavailable for interactive rebase).

  8. Click Rebase.

note

You can cancel an unfinished rebase operation or resume an interrupted rebase by selecting the Abort or Continue actions respectively from the top of the Git Branches popup.

If you do not need to specify options for the rebase, you can initiate a rebase without invoking the rebase dialog. In the Branches popup or in the Branches pane of the Git tool window select a branch and choose one of the following actions:

  • Pull into Current Using Rebase (for remote branches) to fetch changes from the selected branch and rebase the current branch on top of these changes.

  • Checkout and Rebase onto Current (for both remote and local branches) to check out the selected branch and rebase it on top of the branch that is currently checked out. If the remote branch doesn't exist locally, RubyMine will silently create a tracked local branch, checkout into it and rebase.

  • Rebase Current onto Selected (for both remote and local branches) to rebase the branch that is currently checked out on top of the selected.

For details on how to skip or squash commit during a rebase, refer to Edit project history by performing interactive rebase.

Watch this video to see how a merge or a rebase operation are reflected in the Log tab of the Git tool window Alt+9:

Cherry-pick separate commits

Sometimes you only need to apply a single commit to a different branch instead of rebasing or merging an entire branch. This may be useful, for example, if you are working in a feature branch and want to integrate a hotfix from master that was committed after the two branches have diverged. Or you may want to backport a fix to a previous release branch. You can do so by using the Cherry-pick action.

The status of a cherry pick operation is displayed in the status bar. You can always abort an ongoing cherry-pick by selecting Abort Cherry-Pick in the Git Branches popup.

Cherry pick operation status

Apply a commit to another branch

  1. In the Branches popup (main menu Git | Branches), select the target branch that you want to integrate the changes to and choose Checkout from the popup menu to switch to that branch.

  2. Open the Git tool window Alt+9 and switch to the Log tab.

  3. Locate the commit containing the changes you want to cherry pick.

    You can filter commits by branch, user or date. You can also click eye icon on the toolbar and select Highlight | Non-Picked Commits option to grey out the commits that have already been applied to the current branch. If you know the commit hash, or are looking for a tagged commit, you can also use the Go to Hash / Branch / Tag action (press Ctrl+F in the Log tab of the Git tool window Alt+9, or click Search on the toolbar).

  4. Select the required commit. Use the information in the Commit Details area to make sure these are the changes you want to transfer to another branch.

  5. Click Cherry-pick the Cherry-Pick button on the toolbar. RubyMine will apply and commit changes to the target branch.

  6. If the cherry-pick failed with conflicts, the selected changes will appear in Changes area that you can see in the Local Changes view. You can review these changes and commit them later if necessary.

    If you want RubyMine to create changelists automatically in case of cherry-pick fail, switch on the corresponding setting in Settings/Preferences | Version Control | Changelists.

  7. Push the changes to the target branch.

Apply separate changes

Imagine you've made some changes to a file that you want to apply to a different branch, but these changes were committed together with other modified files. RubyMine lets you apply separate changes instead of cherry-picking an entire commit.

Apply separate files

In addition to applying separate changes to a single file, you can copy an entire file's contents to a different branch. This may be useful, for example, if the file you want to apply doesn't exist in the target branch, or if changes to it were made within several commits.

See also

External Links