Undo 'git reset --hard' before first commit

Question

Basically I had a codebase on my local machine, I ran:

git init

git add .

At this point, I realized I wanted to add a .gitignore file.

So I thought I needed to unstage commits, and in an amateur move, executed the following command

git reset --hard 

Now my entire code base is gone...

Is it possible to undo this!?

Answer 1

git add . has added the content of your files into git ; unfortunately, it hasn't created a 'directory' structure which lists your files with their names.

What you can do :

run

git fsck --full --unreachable --no-reflog | grep blob > blobs.txt

# the content of blobs.txt will look like :
unreachable blob 08bf360988858a012dab3af4e0b0ea5f370a2ae8
unreachable blob 21bf7ea93f9f9cc2b3ecbed0e5ed4fa45c75eb89
unreachable blob 08c12ef37075732cf4645269ab5687ba6ba68943
...

For each of these blobs, you can dump the content to disk :

cat blobs.txt | awk '{ print $3 }' | while read blobid; do
    git show $blobid > $blobid.txt
done

You will now have a list of files :

08bf360988858a012dab3af4e0b0ea5f370a2ae8.txt
21bf7ea93f9f9cc2b3ecbed0e5ed4fa45c75eb89.txt
08c12ef37075732cf4645269ab5687ba6ba68943.txt
...

The good news is : all the files that were present in the initial git add . should be represented in there.

The bad news is :

• this list will also contain the files you wanted to ignore initially (I assume you added your node_modules/ folder, so you would have the code for all the js libs you added ...) ,
• you will have to figure out what files went where, and rename them to src/my_controller.js, src/model/my_model.js ...

---

One first filter you could apply, to try to take the node_modules/ files away is :

• in the list of blobs above, try to find your package.json file (grep -e some_package_I_remember),
• rename it to package.json (you may also find the lockfile), and run npm install or yarn install
• this should create a node_modules/ folder, which looks a lot like the previous one you had
• add that node_modules/ folder, and create a commit,
• now, the blobs in node_modules are no longer unreachable ; re-run the git fsck ... > blobs.txt above, you should have a list of what wasn't under node_modules ...