Which statement is TRUE?

Question

BlackTom AI · Accepted Answer

In Git, changes become part of the repository only when you create a commit; that commit is a permanent snapshot (recorded locally) until and unless you later rewrite history.

1. Relevant concepts
- Working directory: files you edit.
- Staging area (index): holds the snapshot of files prepared for the next commit (git add).
- Commit: a recorded snapshot written into the local .git repository; each commit has a unique identifier (hash).
- Push: copies commits from your local repository to a remote (e.g., GitHub); it does not create commits.

2. Step-by-step reasoning
- Edit files in your working directory. These changes are untracked or modified, but not recorded by Git.
- Run git add to stage specific changes: the staging area stores a snapshot, but this is only a preparation step.
- Run git commit to create a commit object in the local .git directory. That commit records the staged snapshot and becomes the authoritative, persistent record in your local repo.
- Run git push to send commits to a remote server. Push transfers existing commits; it does not itself make commits.

3. Intermediate “steps” (conceptual)
- edit -> git add (stage snapshot) -> git commit (write snapshot into local history) -> git push (send commit to remote)

4. Why the correct answer is correct
A commit is the action that writes a snapshot into Git’s local history; before committing, changes can be altered, lost, or omitted. Therefore nothing is permanently saved in the repository until you commit.

5. Why the other options are incorrect
- "Push creates a new local snapshot": push transfers commits to a remote; it does not create a local commit/snapshot.
- "Files are permanently saved when staged": staging only prepares a snapshot for the next commit; it is not part of repository history until committed.
- "A commit only exists on GitHub": commits exist in your local .git repository immediately after git commit; pushing copies them to GitHub but they already existed locally.

6. Conclusion
The correct statement is: "Nothing is permanently saved until you commit." This matches the provided answer.

Which statement is TRUE?单项选择题

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Which Agile principle aligns most closely with Gitflow's practice of isolating features in separate branches?敏捷开发中哪项原则与 Gitflow 将功能隔离在单独分支中的做法最为契合？

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