[git] Merge (with squash) all changes from another branch as a single commit

In Git, is there a way to merge all changes from one branch into another, but squash to a single commit at the same time?

I often work on a new feature in a separate branch and will regularly commit/push - mainly for backup or to transfer what I'm working on to another machine. Mostly those commits say "Feature xxx WIP" or something redundant.

Once that work is finished and I want to merge WIP branch back into master, I'd like to discard all those intermediate commits, and just a have a single clean commit.

Is there an easy way to do this?

Alternatively, how about a command that squashes all commits on a branch since the point where it was branched?

2020 updated

With the --squash flag it looks like two parallel branches with no relation:

Sorting commits related to date looks like:

Personally, i don't like --squash option, try this trick, maybe it fits your needs, i use it for small projects:

1. git init
2. git checkout -b dev
3. Several commits in dev
4. After you did some great commits in dev(but not merged to master yet), if you do not want all commits copied to master branch, then make intentionally change something in master and (add some empty lines in README file and commit in master),
5. git merge dev It results merge conflict(empty lines in README), resolve it, commit with new message you want, and you are DONE. Here is the visual representation of it.

null commit for intentionally merge conflict, name it anything you prefer

git merge --squash <feature branch> is a good option .The "git commit" tells you all feature branch commit message with your choice to keep it .

For less commit merge .

git merge do x times --git reset HEAD^ --soft then git commit .

Risk - deleted files may come back .

You can do this with the "rebase" command. Let's call the branches "main" and "feature":

git checkout feature
git rebase main

The rebase command will replay all of the commits on "feature" as one commit with a parent equal to "main".

You might want to run git merge main before git rebase main if "main" has changed since "feature" was created (or since the most recent merge). That way, you still have your full history in case you had a merge conflict.

After the rebase, you can merge your branch to main, which should result in a fast-forward merge:

git checkout main
git merge feature

See the rebase page of Understanding Git Conceptually for a good overview

Found it! Merge command has a --squash option

git checkout master
git merge --squash WIP

at this point everything is merged, possibly conflicted, but not committed. So I can now:

git add .
git commit -m "Merged WIP"

I have created my own git alias to do exactly this. I'm calling it git freebase! It will take your existing messy, unrebasable feature branch and recreate it so that it becomes a new branch with the same name with its commits squashed into one commit and rebased onto the branch you specify (master by default). At the very end, it will allow you to use whatever commit message you like for your newly "freebased" branch.

Install it by placing the following alias in your .gitconfig:

[alias]
  freebase = "!f() { \
    TOPIC="$(git branch | grep '\\*' | cut -d ' ' -f2)"; \
    NEWBASE="${1:-master}"; \
    PREVSHA1="$(git rev-parse HEAD)"; \
    echo "Freebaseing $TOPIC onto $NEWBASE, previous sha1 was $PREVSHA1"; \
    echo "---"; \
    git reset --hard "$NEWBASE"; \
    git merge --squash "$PREVSHA1"; \
    git commit; \
  }; f"

Use it from your feature branch by running: git freebase <new-base>

I've only tested this a few times, so read it first and make sure you want to run it. As a little safety measure it does print the starting sha1 so you should be able to restore your old branch if anything goes wrong.

I'll be maintaining it in my dotfiles repo on github: https://github.com/stevecrozz/dotfiles/blob/master/.gitconfig

Try git rebase -i master on your feature branch. You can then change all but one 'pick' to 'squash' to combine the commits. See squashing commits with rebase

Finally, you can then do the merge from master branch.

Using git merge --squash <feature branch> as the accepted answer suggests does the trick but it will not show the merged branch as actually merged.

Therefore an even better solution is to:

• Create a new branch from the latest master, commit in the master branch where the feature branch initiated.
• Merge <feature branch> into the above using git merge --squash
• Merge the newly created branch into master. This way, the feature branch will contain only one commit and the merge will be represented in a short and tidy illustration.

This wiki explains the procedure in detail.

In the following example, the left hand screenshot is the result of qgit and the right hand screenshot is the result of:

git log --graph --decorate --pretty=oneline --abbrev-commit

Both screenshots show the same range of commits in the same repository. Nonetheless, the right one is more compact thanks to --squash.

• Over time, the master branch deviated from db.
• When the db feature was ready, a new branch called tag was created in the same commit of master that db has its root.
• From tag a git merge --squash db was performed and then all changes were staged and committed in a single commit.
• From master, tag got merged: git merge tag.
• The branch search is irrelevant and not merged in any way.