Rebase with multiple branches - find lost commit from feature branch
Tests ability to find lost commits from a feature branch after rebase with multiple branches. Evaluates multi-branch reflog analysis.
Baseline Repository
These commands set up the repo before the model sees the prompt. They define the starting file structure, staged changes, and Git history.
- 01
git init - 02
git config user.email 'test@test.com' - 03
git config user.name 'Test User' - 04
echo 'v1.0' > version.txt - 05
git add version.txt - 06
git commit -m 'Release v1.0' - 07
git checkout -b feature-x - 08
echo 'export A' > env.sh - 09
git add env.sh - 10
git commit -m 'Add env export A' - 11
echo 'export B' >> env.sh - 12
git add env.sh - 13
git commit -m 'Add env export B - enables feature X' - 14
git checkout main - 15
git merge feature-x - 16
git branch -D feature-x
Prompt
After merging and deleting 'feature-x', you need to recover the commit 'Add env export B - enables feature X' which was the last commit on that branch. Use git reflog to identify what git command to run.
Expected
Add env export B - enables feature X
Campaign Evidence
Loading campaign evidence…
Model Outputs (14)
Based on the reflog, the commit `Add env export B - enables feature X` has the hash `9a974bf5c978242953fb86be5d119d30ea720bc0`. After merging and deleting the `feature-x` branch, you can recover this commit by recreating the branch at that commit.
Run the following command to restore the branch:
```bash
git branch feature-x 9a974bf5c978242953fb86be5d119d30ea720bc0
```
Alternatively, to check out the commit directly and create the branch in one step:
```bash
git checkout -b feature-x 9a974bf5c978242953fb86be5d119d30ea720bc0
```
Based on the reflog, you can see that the commit `Add env export B - enables feature X` is at `HEAD@{2}` with the hash `c0af884e95af6e0cd2705d5ddeba978f85413c70`.
Since this commit was the last commit on the `feature-x` branch before it was merged (fast-forward) into main, and the merge was a fast-forward (meaning the branch pointer just moved forward), the commit is now part of `main`'s history. But since you want to "recover" it after deleting `feature-x`, you can simply checkout that commit directly.
**The git command to run:**
```bash
git checkout c0af884e95af6e0cd2705d5ddeba978f85413c70
```
Or, if you want to create a new branch at that point:
```bash
git checkout -b recovered-feature-x c0af884e95af6e0cd2705d5ddeba978f85413c70
```
Either way, you'll be at the commit that contains the "Add env export B - enables feature X" changes.
08ea9aaab0f4fa156463cb8532b0e8ceccc2131e
JSON Schema
Structured Output
(raw) {"ref":"08ea9aaab0f4fa156463cb8532b0e8ceccc2131e" }
Based on the `git reflog` output, the commit you want to recover is `4e6cacae09929437da1bb1f2ba8bcadcc1303164` (the one with the message "Add env export B - enables feature X").
Since this commit was the last one on the `feature-x` branch before it was merged and deleted, you can recover it by creating a new branch at that commit:
```bash
git branch feature-x-recovered 4e6cacae09929437da1bb1f2ba8bcadcc1303164
```
This will create a new branch called `feature-x-recovered` pointing to that commit. You can then check it out if needed:
```bash
git checkout feature-x-recovered
```
Alternatively, if you just want to cherry-pick that specific commit onto your current branch:
```bash
git cherry-pick 4e6cacae09929437da1bb1f2ba8bcadcc1303164
```
The reflog shows that this commit was made on the `feature-x` branch (HEAD@{2}) before it was merged into main (HEAD@{0}). The commit is still in your repository's object database, so it can be recovered using its hash.
7bc57ffefa0237267ea5186188783b9e2a581699
JSON Schema
Structured Output
(raw) {"ref": "7bc57ffefa0237267ea5186188783b9e2a581699"}
The commit you want is reached by the reflog entry **HEAD@{2}** (the line that says `commit: Add env export B - enables feature X`).
To recover it you can simply create a new branch pointing at that commit (or check it out directly).
**Command to run**
```bash
git checkout -b feature-x-recover HEAD@{2}
```
* What this does:
* `HEAD@{2}` points to the third entry in your reflog, which is the exact commit hash of **“Add env export B - enables feature X”**.
* `git checkout -b …` creates a new branch named `feature-x-recover` (you can pick any name you like) that starts at that commit, giving you a reference to the lost commit.
If you prefer just to create a branch without checking it out immediately, you can also use:
```bash
git branch feature-x-recover HEAD@{2}
```
Either way restores the missing commit. You can then merge it, push it, or do whatever you need with it.
**Answer**
The reflog entry you want is the **third line** shown:
```
7fefb935e09dd03415daac256b3dfb7ef85ec98c HEAD@{2}: commit: Add env export B - enables feature X
```
That entry corresponds to the commit **`Add env export B - enables feature X`**, which was the last commit on branch **`feature-x`**.
---
### What git command should you run?
To recover (check out) that specific commit, run:
```bash
git checkout 7fefb935e09dd03415daac256b3dfb7ef85ec98c
```
or, for readability, you can use the shorter "short name" that Git suggests (the ABI prefix shown in the reflog):
```bash
git checkout HEAD@{2}
```
Both commands will place you on that commit, giving you access to the files exactly as they were after the `Add env export B - enables feature X` commit.
---
### Why this works
* `git reflog` records **where HEAD has been moved**.
`HEAD@{n}` refers to the **state of HEAD `n` entries ago**.
* After the hard‑reset (or checkout + delete) of `feature-x`, `HEAD` now points at the merge commit (`8847b376…`).
The reflog entry `@{2}` is the commit that preceded the merge—that is the “Add env export B …” commit.
* `git checkout HEAD@{2}` simply moves the current HEAD back to that commit, effectively restoring the branch tip to the desired state.
---
### Quick sanity check
```bash
$ git log -1 --oneline
Add env export B - enables feature X # <-- you should see this line
```
If the log shows the exact commit message you were looking for, you have successfully recovered it.
---
**Summary:** Use `git checkout HEAD@{2}` (or the full SHA) to restore the lost commit. No further options or special commands are needed.
e314518e9e3e138adbc537a3adee934384120e87#HEAD@{2}
JSON Schema
Structured Output
(raw) {
"ref": "e314518e9e3e138adbc537a3adee934384120e87#HEAD@{2}"
}
Based on the git reflog, I can see the commit you want to recover:
- `HEAD@{2}` shows: `d0dbc5ae9d563fc081158c232bc18184de25a23e HEAD@{2}: commit: Add env export B - enables feature X`
The commit hash for "Add env export B - enables feature X" is **`d0dbc5ae9d563fc081158c232bc18184de25a23e`**.
To recover this commit, you should run:
```bash
git cherry-pick d0dbc5ae9d563fc081158c232bc18184de25a23e
```
This will apply the changes from that commit onto your current branch (main). The `git cherry-pick` command is perfect for recovering individual commits that were part of a deleted branch.
214f45958e686200cf9bd37e6da36fa85fb7db95
JSON Schema
Structured Output
(raw) {"ref": "214f45958e686200cf9bd37e6da36fa85fb7db95"}
To recover the commit 'Add env export B - enables feature X' from the deleted 'feature-x' branch, you can use the commit hash found in the reflog.
The commit is referenced at `HEAD@{2}` with hash `8c5bc3f854868cece41db1f1508822c637cdb748`.
You can recover it by checking out that specific commit:
```bash
git checkout 8c5bc3f854868cece41db1f1508822c637cdb748
```
Alternatively, if you want to restore it as a new branch:
```bash
git checkout -b restore-feature-x 8c5bc3f854868cece41db1f1508822c637cdb748
```
abe83362dfb9ded8ac8cd95ce2bb1759f6c83a70
JSON Schema
Structured Output
(raw) {"ref": "abe83362dfb9ded8ac8cd95ce2bb1759f6c83a70"}
Invalid JSON. Output: The commit `Add env export B - enables feature X` (hash `227d9e3`) is still reachable from `main` after the fast-forward merge. However, to restore the deleted branch `feature-x` pointing to this commit, run:
```bash
git branch feature-x 227d9e3ad7faa18fa017b139fe02e69e09dd1047
```
JSON Schema
Structured Output
Structured Output Error
Failed to parse structured JSON response: Expecting value: line 1 column 1 (char 0)
Failure: Failed to parse structured JSON response: Expecting value: line 1 column 1 (char 0)
refs/heads/main
JSON Schema
Structured Output
(raw) {
"ref": "refs/heads/main"
}
Failure: Expected output to mention target hash prefix/full hash or matching HEAD@{n} selector for 'Add env export B - enables feature X'