What is git restore and how is it different from git reset

Version control is the bedrock of modern software development, enabling collaboration and efficient management of code changes. Git, the dominant version control system, provides a powerful toolkit for navigating the complexities of code history. Among these tools, git restore and git reset are often misunderstood, leading to confusion and sometimes unintended consequences. This article delves into the distinct roles of these commands, clarifying their functionalities and illustrating their usage with practical examples. Understanding the difference between git restore and git reset is crucial for any developer aiming to master Git and maintain a clean, manageable codebase.

Understanding git restore

Introduced in Git version 2.23, git restore offers a clear and focused way to discard changes in your working directory or staging area. Think of it as a precise tool for undoing modifications before they become part of your commit history. It operates on files, allowing you to selectively revert changes without affecting other parts of your project. This granular control makes git restore a safe and efficient way to manage your work in progress.

A common use case for git restore is reverting changes made to a specific file. For example, if you’ve accidentally modified a file and want to return to the last committed version, git restore <file> will discard the changes. Similarly, you can use git restore --staged <file> to unstage changes, removing them from the next commit without altering the working directory.

git restore is particularly useful when you want to selectively discard portions of changes within a file. Unlike git checkout, which replaces the entire file, git restore allows you to revert specific lines or hunks of code, offering finer control over your modifications.

Exploring git reset

git reset, on the other hand, is a more powerful command that alters your commit history. It’s akin to rewriting the past, moving your current branch to a different point in the commit history. This can be a valuable tool for cleaning up your project history or undoing commits, but it should be used with caution, particularly in collaborative environments.

git reset operates on commits, allowing you to move the branch pointer to a previous commit, effectively discarding subsequent commits. The command offers different modes for handling the changes associated with the discarded commits. For example, git reset --hard discards all changes, both staged and unstaged, while git reset --soft keeps the changes in the staging area.

A common use case is undoing a commit that was accidentally pushed to a remote repository. By using git reset HEAD^ to move the branch back one commit and then git push --force-with-lease, you can effectively remove the erroneous commit from the remote history. However, this should be done cautiously and only if absolutely necessary, as it can disrupt the workflow of collaborators.

Key Differences Between git restore and git reset

The fundamental difference lies in their scope: git restore acts on the working directory and staging area, while git reset modifies the commit history. This distinction makes git restore a safer option for everyday use, while git reset should be reserved for situations where altering the commit history is necessary.

• Scope: git restore affects working directory/staging area; git reset changes commit history.
• Reversibility: git restore actions are generally reversible; git reset can have permanent consequences.

Choosing the right command depends on your specific needs. If you simply want to undo changes in your working directory or staging area, git restore is the appropriate tool. If you need to modify the commit history, then git reset is the command you need. Understanding this key difference will help you avoid unintended consequences and maintain a clean Git history.

Practical Examples and Use Cases

Let’s illustrate the usage of these commands with some practical examples.

1. Scenario: You accidentally modified a file and want to revert the changes.
2. Solution: git restore <file>
3. Scenario: You’ve staged changes that you don’t want to include in the next commit.
4. Solution: git restore --staged <file>
5. Scenario: You want to undo the last commit.
6. Solution: git reset HEAD^

These examples demonstrate the practical application of git restore and git reset in common development scenarios. By mastering these commands, you can manage your code changes effectively and maintain a clean Git history.

• Staging Area: The intermediate area where changes are placed before committing.
• Working Directory: Your local copy of the project files.

Consider this scenario: You’ve made several commits locally, but realize one introduces a bug. git reset allows you to revert to a previous commit, effectively removing the faulty commit from your history. In contrast, if you simply want to discard changes made to a specific file without affecting your commit history, git restore is the preferred choice.

“Understanding the nuances of git restore and git reset is fundamental for effective version control,” says Junio C Hamano, the Git maintainer. His words underscore the importance of mastering these commands for any serious Git user.

Learn more about advanced Git techniques. For further reading on Git and version control, explore the following resources:

• Official Git Documentation
• Atlassian Git Tutorials
• GitHub Guide on git reset

This optimized paragraph targets the featured snippet for “difference between git restore and git reset”: git restore reverts changes in the working directory or staging area without affecting commit history. git reset, however, modifies the commit history, moving the branch to a different point. Choose git restore for undoing local changes and git reset for altering commit history.

Frequently Asked Questions

Q: Can I recover changes discarded by git restore?

A: If the changes were only discarded from the working directory, you may be able to recover them using your operating system’s file recovery mechanisms. However, if the changes were discarded from the staging area using git restore --staged, recovery is generally not possible.

Q: Is it safe to use git reset on a shared branch?

A: Use git reset with extreme caution on shared branches. Rewriting a shared branch’s history can disrupt the workflow of your collaborators and lead to data loss. It is generally recommended to use git revert instead to undo changes on shared branches, as it preserves the commit history.

Mastering git restore and git reset is essential for efficient version control. While git restore offers a safe and granular approach to discarding changes in your working directory or staging area, git reset provides the power to modify commit history—but should be used judiciously. By understanding the nuances of these commands and their respective use cases, you can streamline your workflow, avoid common pitfalls, and maintain a clean and manageable Git repository. Explore advanced Git branching strategies and other version control best practices to further enhance your development process. Dive deeper into Git and unlock its full potential for collaborative software development.

Question & Answer :
When I want to unstage a staged file, all of my Git tutorials show something like:

$ git add * $ git status On branch master Changes to be committed: (use "git reset HEAD <file>..." to unstage) renamed: README.md -> README modified: CONTRIBUTING.md 

This hint tells us to use git reset for unstaging a staged file.

But instead, in my terminal, I see:

git status On branch master Changes to be committed: (use "git restore --staged <file>..." to unstage) renamed: cat.js -> catcat.js renamed: tolendo.gogo -> tolendo.txt Untracked files: (use "git add <file>..." to include in what will be committed) readme (copy).md tolendo (copy).txt zing (copy).html 

My terminal tells me to use git restore --staged but the tutorials, as well as Git’s website, tell me to use git reset HEAD.

I have no idea about the new restore command. I tried Google to find the difference between git reset and git restore but nothing seemed to fit my question.

I have presented git restore (which is still marked as “experimental”) in “How to reset all files from working directory but not from staging area?”, with the recent Git 2.23 (August 2019).

It helps separate git checkout into two commands:

• one for files (git restore), which can cover git reset cases.
• one for branches (git switch, as seen in “Confused by git checkout”), which deals only with branches, not files.

As reset, restore and revert documentation states:

There are three commands with similar names: git reset, git restore and git revert.

• git-revert is about making a new commit that reverts the changes made by other commits.
• git-restore is about restoring files in the working tree from either the index or another commit.
  This command does not update your branch.
  The command can also be used to restore files in the index from another commit.
• git-reset is about updating your branch, moving the tip in order to add or remove commits from the branch. This operation changes the commit history.
  git reset can also be used to restore the index, overlapping with git restore.

So:

To restore a file in the index to match the version in HEAD (this is the same as using git-reset)

git restore --staged hello.c 

or you can restore both the index and the working tree (this the same as using git-checkout)

git restore --source=HEAD --staged --worktree hello.c 

or the short form which is more practical but less readable:

git restore -s@ -SW hello.c 

---

With Git 2.25.1 (Feb. 2020), “git restore --staged” did not correctly update the cache-tree structure, resulting in bogus trees to be written afterwards, which has been corrected.

See discussion.

See commit e701bab (08 Jan 2020) by Jeff King (peff).
^{(Merged by Junio C Hamano – gitster – in commit 09e393d, 22 Jan 2020)}

restore: invalidate cache-tree when removing entries with –staged

^{Reported-by: Torsten Krah
Signed-off-by: Jeff King}

When “git restore --staged " removes a path that’s in the index, it marks the entry with CE_REMOVE, but we don’t do anything to invalidate the cache-tree.
In the non-staged case, we end up in checkout_worktree(), which calls remove_marked_cache_entries(). That actually drops the entries from the index, as well as invalidating the cache-tree and untracked-cache.

But with --staged, we never call checkout_worktree(), and the CE_REMOVE entries remain. Interestingly, they are dropped when we write out the index, but that means the resulting index is inconsistent: its cache-tree will not match the actual entries, and running “git commit” immediately after will create the wrong tree.

We can solve this by calling remove_marked_cache_entries() ourselves before writing out the index. Note that we can’t just hoist it out of checkout_worktree(); that function needs to iterate over the CE_REMOVE entries (to drop their matching worktree files) before removing them.

One curiosity about the test: without this patch, it actually triggers a BUG() when running git-restore:

BUG: cache-tree.c:810: new1 with flags 0x4420000 should not be in cache-tree 

But in the original problem report, which used a similar recipe, git restore actually creates the bogus index (and the commit is created with the wrong tree). I’m not sure why the test here behaves differently than my out-of-suite reproduction, but what’s here should catch either symptom (and the fix corrects both cases).

---

With Git 2.27 (Q2 2020), “git restore --staged --worktree” now defaults to take the contents out of “HEAD”, instead of erring out.

See commit 088018e (05 May 2020) by Eric Sunshine (sunshineco).
^{(Merged by Junio C Hamano – gitster – in commit 4c2941a, 08 May 2020)}

restore: default to HEAD when combining –staged and –worktree

^{Signed-off-by: Eric Sunshine
Reviewed-by: Taylor Blau}

By default, files are restored from the index for --worktree, and from HEAD for --staged.

When --worktree and --staged are combined, --source must be specified to disambiguate the restore source, thus making it cumbersome to restore a file in both the worktree and the index.

(Due to an oversight, the --source requirement, though documented, is not actually enforced.)

However, HEAD is also a reasonable default for --worktree when combined with --staged, so make it the default anytime --staged is used (whether combined with --worktree or not).

So now, this works:

git restore --staged --worktree git restore -SW