Git - finding a filename from a SHA1

Question

I added a file to the index with:

git add somefile.txt

I then got the SHA1 for this file with:

git hash-object somefile.txt         


        

Answer 1

There's no such direct mapping in git as the name of the file is part of the tree object that contains the file, not of the blob object that is the file's contents.

It's not a usual operation to want to retrieve a file name from a SHA1 hash so perhaps you could expand on a real world use case for it?

If you're looking at current files (i.e. the HEAD commit) you can try the following.

git ls-tree -r HEAD | grep 

If you want to find the contents in previous commits you'll need to do something more like this.

git rev-list  | \
xargs -n1 -iX sh -c "git ls-tree -r X | grep  && echo X"