Can't add to index twice in a row in 3.1.25 (PermissionError)

[zhiltsov-max]

Hi, we've observed a regression in 3.1.25 (it doesn't happen in 3.1.24).

Running the following script (Python 3.8.6, Windows 10):

import git

repo = git.Repo.init('test_git')
with open('test_git/f.txt', 'w') as f:
    f.write('aa')
with open('test_git/g.txt', 'w') as f:
    f.write('bb')
repo.index.add('f.txt')
repo.index.add('g.txt') # < fails here
repo.index.commit('initial commit')
repo.close()

Produces:

(venv) PS C:\test> python .\test_git_close.py

Traceback (most recent call last):
  File ".\test_git_close.py", line 9, in <module>
    repo.index.add('g.txt')
  File "venv\lib\site-packages\git\index\base.py", line 823, in add
    self.write(ignore_extension_data=not write_extension_data)
  File "venv\lib\site-packages\git\index\base.py", line 221, in write
    lfd.commit()
  File "venv\lib\site-packages\gitdb\util.py", line 359, in commit
    self._end_writing(successful=True)
  File "venv\lib\site-packages\gitdb\util.py", line 384, in _end_writing
    remove(self._filepath)
  File "venv\lib\site-packages\gitdb\util.py", line 83, in remove
    return _retry(os.remove, *args, **kwargs)
  File "venv\lib\site-packages\gitdb\util.py", line 77, in _retry
    return func(*args, **kwargs)
PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'test_git\\.git\\index'

Can be related to #1333

[Byron]

Thanks for reporting, and apologies for letting that slip. e16a004 implements a fix which hopefully is the right way to do this.

A new release was published and 3.1.26 should contain the fix.
Please reopen the issue or create a new one if the issue isn't solved.