fatal: git-write-tree: error building trees

I did a git pull from a shared git repository, but something went really wrong, after I tried a git revert. Here is the situation now:

$ git stash
Source/MediaStorageAndFileFormat/gdcmImageCodec.cxx: needs merge
Source/MediaStorageAndFileFormat/gdcmJPEGLSCodec.cxx: needs merge
Source/MediaStorageAndFileFormat/gdcmPNMCodec.cxx: needs merge
Testing/Source/DataStructureAndEncodingDefinition/Cxx/TestDS.cxx: needs merge
Utilities/socketxx/socket++/sockstream.cpp: needs merge
Source/MediaStorageAndFileFormat/gdcmImageCodec.cxx: needs merge
Source/MediaStorageAndFileFormat/gdcmJPEGLSCodec.cxx: needs merge
Source/MediaStorageAndFileFormat/gdcmPNMCodec.cxx: needs merge
Testing/Source/DataStructureAndEncodingDefinition/Cxx/TestDS.cxx: needs merge
Utilities/socketxx/socket++/sockstream.cpp: needs merge
Source/MediaStorageAndFileFormat/gdcmImageCodec.cxx: unmerged (2aafac967c35fa4e77c3086b83a3c102939ad168)
Source/MediaStorageAndFileFormat/gdcmImageCodec.cxx: unmerged (78cc95e8bae85bf8345a7793676e878e83df167b)
Source/MediaStorageAndFileFormat/gdcmImageCodec.cxx: unmerged (2524db713fbde0d7ebd86bfe2afc4b4d7d48db33)
Source/MediaStorageAndFileFormat/gdcmJPEGLSCodec.cxx: unmerged (4bb4ba78973091eaa854b03c6ce24e8f4af9e7cc)
Source/MediaStorageAndFileFormat/gdcmJPEGLSCodec.cxx: unmerged (ad0982b8b8b4c4fef23e69bbb639ca6d0cd98dd8)
Source/MediaStorageAndFileFormat/gdcmJPEGLSCodec.cxx: unmerged (4868371b7218c6e007fb6c582ad4ab226167a80a)
Source/MediaStorageAndFileFormat/gdcmPNMCodec.cxx: unmerged (f7a1b386b5b13b8fa8b6a31ce1258d2d5e5b13c5)
Source/MediaStorageAndFileFormat/gdcmPNMCodec.cxx: unmerged (6ce299c416fbb3bb60e11ef1e54962ffd3449a4c)
Source/MediaStorageAndFileFormat/gdcmPNMCodec.cxx: unmerged (75c8043a60a56a1130a34cdbd91d130bc9343c1c)
Testing/Source/DataStructureAndEncodingDefinition/Cxx/TestDS.cxx: unmerged (79c2843f2649ea9c87fa57662dafd899a5fa39ee)
...
fatal: git-write-tree: error building trees
Cannot save the current index state

Is there a way to reset all that ?

Thanks

Solution 1:

Use:

git reset --mixed

instead of git reset --hard. You will not lose any changes.

Solution 2:

This worked for me:

Do

$ git status

And check if you have Unmerged paths

# Unmerged paths:
#   (use "git reset HEAD <file>..." to unstage)
#   (use "git add <file>..." to mark resolution)
#
#   both modified:      app/assets/images/logo.png
#   both modified:      app/models/laundry.rb

Fix them with git add to each of them and try git stash again.

git add app/assets/images/logo.png

Solution 3:

To follow up on malat's response, you can avoid losing changes by creating a patch and reapply it at a later time.

git diff --no-prefix > patch.txt
patch -p0 < patch.txt

Store your patch outside the repository folder for safety.