Description

sebastianst

opened on Sep 6, 2024

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Using git python to add files to an index fails at an index head assertion if the local repo is being otherwise worked on with git 2.46.0:

GitPython/git/index/fun.py

Lines 209 to 210 in cfadd9e

	# TODO: Handle version 3: extended data, see read-cache.c.
	assert version in (1, 2)

Is it planned to add support for version 3 soon?

I couldn't find any ticket tracking this, so apologies if this is a duplicate.

Reacted by Dan Brown

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1. Byron commented on Sep 6, 2024

   

   Byron

   on Sep 6, 2024

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   There is no plan to add support for extended index flag in V3, even though it would probably be quite easy to add if someone wanted to contribute support for it.

   Generally, I probably wouldn't trust the index implementation as it is here and if possible, repo.git might be able to do the same with a decent amount of convenience.
2. mgorny commented on Nov 4, 2024

   

   mgorny

   on Nov 4, 2024

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   For the record, the workaround is to set:

   git config --global feature.manyFiles false
   

   and clone the repo again (or use -c feature.manyFiles=false when cloning it).
3. tombedor commented on Jun 17, 2025

   

   tombedor

   on Jun 17, 2025

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   Made a PR to make errors from using an unsupported version a bit easier to debug: #2055

   Reacted by Sebastian Thiel
4. Byron commented on Jun 18, 2025

   

   Byron

   on Jun 18, 2025

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   It's a bit sad that the custom index implementation is half-baked only, and a little wonder that people can use it at all. In retrospect, it would have been better to only use Git for index manipulation. Maybe it's possible to workaround with repo.git as well.
5. misrasaurabh1 commented on Nov 15, 2025

   

   misrasaurabh1

   on Nov 15, 2025

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   thank you, index v3 support will help fix a crash for us.

   Reacted by Sebastian Thiel
6. Byron

   added the

   Feature

   issue type on Jul 20, 2026
7. Byron commented on Jul 20, 2026

   

   Byron

   on Jul 20, 2026

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   --- agent

   This has been implemented by merged PR #2081, “Preliminary support for index format v3,” merged on November 9, 2025. Current GitPython code accepts index versions 1–3 and writes version 3 when extended flags are present. Closing this issue as resolved.
8. Byron

   closed this as completedon Jul 20, 2026
9. TVick64889

   added a commit that references this issue on Sep 9, 2026

   test: verify GitPython index-v3 support already works (closes Aider-A…

   b29a539

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