Support index diffs against the empty tree - #2155
Merged
Byron merged 5 commits intoMay 27, 2026
Merged
Conversation
Contributor
There was a problem hiding this comment.
Pull request overview
Note
Copilot was unable to run its full agentic suite in this review.
Adds IndexFile.diff(NULL_TREE) support so callers can diff the index against an “empty tree” (useful for initial index contents), and introduces a regression test to validate expected diff output.
Changes:
- Extends
IndexFile.diff()to accept and handleNULL_TREEas theotherdiff target. - Implements a custom
git diff --cached <empty-tree>invocation to produce raw/patch output for the NULL_TREE case. - Adds a test covering initial index diffing against
NULL_TREE, including path filtering and patch creation.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.
| File | Description |
|---|---|
| test/test_index.py | Adds coverage for diffing an initial index against NULL_TREE and verifying raw + patch output. |
| git/index/base.py | Implements IndexFile.diff(NULL_TREE) by invoking git diff --cached against the empty-tree SHA. |
💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.
Assisted-by: OpenAI GPT-5
puneetdixit200
force-pushed
the
fix-initial-index-diff
branch
from
May 21, 2026 07:47
4508774 to
3895682
Compare
Assisted-by: ChatGPT
Contributor
Author
|
AI agent on behalf of Puneet: pushed Verified:
|
Co-authored-by: OpenAI Codex <codex@openai.com>
Co-authored-by: OpenAI Codex <codex@openai.com>
Match the AutoInterrupt wait signature so diff parser tests can pass preserved stderr through finalize_process. Assisted-by: OpenAI GPT-5
Member
|
It seems bots are running around and fixing to dos automatically. And in a way, it's fine. This seems to be addressing the TODO legitimately and the bots already hashed it out, so I'll just try rolling with it. The biggest problem GitPython has is that I don't think it has a human who knows what good Python is supposed to be like these days. So, agents will basically rule this place and all I can do is to apply high level quality constraints - better than nothing. |
736-c41-2c1-e464fc974
pushed a commit
to Swiss-Armed-Forces/Loom
that referenced
this pull request
Aug 16, 2026
This MR contains the following updates: | Package | Type | Update | Change | OpenSSF | |---|---|---|---|---| | [gitpython](https://github.com/gitpython-developers/GitPython) | dev | patch | `3.1.50` → `3.1.52` | [](https://securityscorecards.dev/viewer/?uri=github.com/gitpython-developers/GitPython) | --- ### Release Notes <details> <summary>gitpython-developers/GitPython (gitpython)</summary> ### [`v3.1.52`](https://github.com/gitpython-developers/GitPython/releases/tag/3.1.52): Security [Compare Source](gitpython-developers/GitPython@3.1.51...3.1.52) <GHSA-rwj8-pgh3-r573>: Environment-variable exfiltration via os.path.expandvars() on Repo.clone\_from() URL #### What's Changed - Skip cross-drive relative config test on Windows by [@​Byron](https://github.com/Byron) in [#​2171](gitpython-developers/GitPython#2171) - fix: preserve literal clone URLs by [@​Byron](https://github.com/Byron) in [#​2172](gitpython-developers/GitPython#2172) **Full Changelog**: <gitpython-developers/GitPython@3.1.51...3.1.52> ### [`v3.1.51`](https://github.com/gitpython-developers/GitPython/releases/tag/3.1.51): - Security [Compare Source](gitpython-developers/GitPython@3.1.50...3.1.51) #### What's Changed - Add AI-disclosure and quality requirements to the contribution guidelines by [@​Byron](https://github.com/Byron) in [#​2143](gitpython-developers/GitPython#2143) - docs(cmd): clarify Git.execute() string vs list command argument by [@​mvanhorn](https://github.com/mvanhorn) in [#​2144](gitpython-developers/GitPython#2144) - Rewrite Git.execute() command parameter docstring per [#​2146](gitpython-developers/GitPython#2146) by [@​EliahKagan](https://github.com/EliahKagan) in [#​2147](gitpython-developers/GitPython#2147) - Document init script behavior with multiple master remotes by [@​EliahKagan](https://github.com/EliahKagan) in [#​2148](gitpython-developers/GitPython#2148) - Bump git/ext/gitdb from `335c0f6` to `0a019a2` by [@​dependabot](https://github.com/dependabot)\[bot] in [#​2149](gitpython-developers/GitPython#2149) - Support relative worktree paths (git 2.48+ worktree.useRelativePaths) by [@​elovelan](https://github.com/elovelan) in [#​2151](gitpython-developers/GitPython#2151) - Defer xfail condition evaluation with xfail\_if\_raises context manager by [@​elovelan](https://github.com/elovelan) in [#​2153](gitpython-developers/GitPython#2153) - Run more submodule tests on Cygwin (fix flaky xfails) by [@​EliahKagan](https://github.com/EliahKagan) in [#​2154](gitpython-developers/GitPython#2154) - Cut xtrace noise from POSIX-ownership diagnostic steps by [@​EliahKagan](https://github.com/EliahKagan) in [#​2156](gitpython-developers/GitPython#2156) - Support index diffs against the empty tree by [@​puneetdixit200](https://github.com/puneetdixit200) in [#​2155](gitpython-developers/GitPython#2155) - refactor: seperate out Progress type by [@​LoeschMaximilian](https://github.com/LoeschMaximilian) in [#​2157](gitpython-developers/GitPython#2157) - Bump <https://github.com/astral-sh/ruff-pre-commit> from v0.15.12 to 0.15.15 in the pre-commit group by [@​dependabot](https://github.com/dependabot)\[bot] in [#​2160](gitpython-developers/GitPython#2160) - Bump actions/checkout from 6 to 7 by [@​dependabot](https://github.com/dependabot)\[bot] in [#​2164](gitpython-developers/GitPython#2164) - Bump git/ext/gitdb from `0a019a2` to `4950ea9` by [@​dependabot](https://github.com/dependabot)\[bot] in [#​2165](gitpython-developers/GitPython#2165) - Bump <https://github.com/astral-sh/ruff-pre-commit> from v0.15.15 to 0.15.20 in the pre-commit group by [@​dependabot](https://github.com/dependabot)\[bot] in [#​2166](gitpython-developers/GitPython#2166) - Add Commit.is\_shallow property; document stats() limitation at shallow boundary by [@​harshitayadavv](https://github.com/harshitayadavv) in [#​2167](gitpython-developers/GitPython#2167) - Allow relative config paths with includes by [@​Byron](https://github.com/Byron) in [#​2169](gitpython-developers/GitPython#2169) - Reject abbreviated forms of unsafe git options by [@​Byron](https://github.com/Byron) in [#​2168](gitpython-developers/GitPython#2168) - guard unsafe git command options by [@​Byron](https://github.com/Byron) in [#​2163](gitpython-developers/GitPython#2163) #### New Contributors - [@​elovelan](https://github.com/elovelan) made their first contribution in [#​2151](gitpython-developers/GitPython#2151) - [@​puneetdixit200](https://github.com/puneetdixit200) made their first contribution in [#​2155](gitpython-developers/GitPython#2155) - [@​LoeschMaximilian](https://github.com/LoeschMaximilian) made their first contribution in [#​2157](gitpython-developers/GitPython#2157) - [@​harshitayadavv](https://github.com/harshitayadavv) made their first contribution in [#​2167](gitpython-developers/GitPython#2167) **Full Changelog**: <gitpython-developers/GitPython@3.1.50...3.1.51> </details> --- - [ ] <!-- rebase-check -->If you want to rebase/retry this MR, check this box --- This MR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4yNzAuMCIsInVwZGF0ZWRJblZlciI6IjQzLjI3MC4wIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJkZXBlbmRlbmNpZXMiLCJyZW5vdmF0ZSJdfQ==--> See merge request swiss-armed-forces/cyber-command/cea/loom!679 Co-authored-by: Loom MR Pipeline Trigger <group_103951964_bot_9504bb8dead6d4e406ad817a607f24be@noreply.gitlab.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Related to #2025.
IndexFile.diff()is documented as accepting the same targets asDiffable.diff(), includingNULL_TREE, but the index-specific implementation rejectedNULL_TREEbefore it could produce a diff. That leaves no direct API path for inspecting staged entries for an initial commit against the empty tree.This adds explicit
IndexFile.diff(NULL_TREE)handling usinggit diff --cachedagainst the empty tree object. I keptIndexFile.diff(None)as the existing index-vs-working-tree comparison, since that behavior is documented in the quick docs and existing tests.The regression test creates a new repository, stages a file, writes the index, constructs a fresh
IndexFile, and verifies thatindex.diff(NULL_TREE)reports the staged addition whileindex.diff(None)remains empty because the working tree matches the index.Validation:
.venv/bin/python -m pytest --no-cov test/test_index.py::TestIndex::test_index_file_diff_null_tree_with_initial_index -q.venv/bin/python -m ruff check git/index/base.py test/test_index.pyAI assistance disclosure: OpenAI GPT-5 helped draft and check this change; I reviewed the implementation and tests before submitting.