git add + git reset hard deleted working copy file - undo?

问题

I have added a directory with git add and realized that there are wrong files in it, so I used git reset --hard to go back to the latest commit but I didn't know that git would also delete those added files in the working copy.

Does anyone know how I undo this?

回答1:

When you git add a file, it is added to the object database and to the index. Running git reset updated the index and the working directory, but it did not remove those files from the object database. They remain as unrooted ("dangling") objects. You can run the git filesystem checker, git fsck to see what items are "dangling". You should see a report like:

% git fsck
dangling blob 1ff0c423042b46cb1d617b81efb715defbe8054d
dangling blob 1bc915c5cb7185a9438de28a7b1a7dfe8c01ee7f
dangling blob a8c86221b400b836010567cc3593db6e96c1a83a
dangling blob 46ff0854663aeb2182b9838c8da68e33ac23bc1e
dangling blob 21a96a98ed84d45866e1de6e266fd3a61a4ae9dc
... etc ...

If you also happen to have a dangling tree, you may be able to restore the filename to blob ID mappings. If you have some dangling tree:

dangling tree 57623d711c18d819831f24a9456f0660e9dbe596

Then you can display the tree contents by running the git ls-tree command:

% git ls-tree 57623d711c18d819831f24a9456f0660e9dbe596
100644 blob 21a96a98ed84d45866e1de6e266fd3a61a4ae9dc file1.txt
100644 blob 46ff0854663aeb2182b9838c8da68e33ac23bc1e file2.txt

This indicates that blob 46ff0854663aeb2182b9838c8da68e33ac23bc1e was added originally as file1.txt. However, it is most likely that you did not get trees added to the object database and you will need to examine each file to determine where you wish to save it.

You can get the blob's contents using the git cat-file command. For example, to save it to recovered.bak:

% git cat-file blob 46ff0854663aeb2182b9838c8da68e33ac23bc1e  > recovered.bak

来源：https://stackoverflow.com/questions/21197545/git-add-git-reset-hard-deleted-working-copy-file-undo