Learn the essential Git command a developer should execute before raising a pull request to the master branch when working on separate application releases with feature branches.
Table of Contents
Question
Two developers are working on separate application releases. The developers have created feature branches named Branch A and Branch B by using a GitHub repository’s master branch as the source.
The developer for Branch A deployed code to the production system. The code for Branch B will merge into a master branch in the following week’s scheduled application release.
Which command should the developer for Branch B run before the developer raises a pull request to the master branch?
A. git diff branchB master
git commit -m
B. git pull master
C. git rebase master
D. git fetch -b master
Answer
C. git rebase master
Explanation
Before raising a pull request to merge changes from a feature branch (Branch B) into the master branch, the developer should run the command `git rebase master`. This command ensures that the feature branch incorporates the latest changes from the master branch, making the merge process smoother and reducing the likelihood of conflicts.
Here’s how the `git rebase master` command works:
- The command temporarily sets aside the commits in the feature branch (Branch B).
- It then applies the latest commits from the master branch to the feature branch.
- Finally, it reapplies the commits from the feature branch on top of the updated master branch.
By running `git rebase master`, the developer ensures that Branch B is up to date with the latest changes in the master branch, including the code deployed to production from Branch A. This step is crucial because it allows the developer to resolve any potential conflicts between the two branches before creating a pull request.
The other options are incorrect for the following reasons:
A. `git diff branchB master` followed by `git commit -m` is used to compare the differences between two branches and create a new commit with those changes. It doesn’t incorporate the latest changes from the master branch into the feature branch.
B. `git pull master` would merge the changes from the master branch into the feature branch, but it might result in a merge commit, which can make the commit history less linear and harder to understand.
D. `git fetch -b master` is an invalid command. The correct command to fetch changes from the master branch is `git fetch origin master`, but this only retrieves the changes without applying them to the feature branch.
In summary, running `git rebase master` before raising a pull request ensures that the feature branch is up to date with the latest changes in the master branch, making the merge process cleaner and reducing the chances of conflicts.
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