fix(git): reject relative pathspecs outside repository

[nia-sg-bot]

Summary

• reject caller-relative pathspecs that resolve above the repository root before invoking Git
• preserve the existing structured pathspec_outside_repository warning instead of returning a generic Git command failure
• cover staged, unstaged, and commit-range resolution from a subdirectory caller

Part of #21.

Validation

• python3 -m pytest (196 passed)
• git diff --check origin/main...HEAD
• python3 setup.py --name --version

Remaining work

Issue #21 retains its broader comparison-mode and edge-case acceptance criteria; this PR is limited to explicit, non-widening handling of escaping relative pathspecs.

Summary by CodeRabbit

• Bug Fixes
  • Repository-scoped searches now reject relative paths that escape the repository, including when started from a subdirectory. These requests return a warning instead of being passed through for Git to resolve.
  • The protection also applies to paths using Windows-style separators and to staged, unstaged, and commit-range searches.

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Reviewing files that changed from the base of the PR and between 76924e2 and 5769ca5.

📒 Files selected for processing (2)

• diffgraph/git_snapshot.py
• tests/test_git_snapshot.py

🚧 Files skipped from review as they are similar to previous changes (2)

• diffgraph/git_snapshot.py
• tests/test_git_snapshot.py

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Walkthrough

The pathspec resolver now rejects relative pathspecs that escape the repository and reports a pathspec_outside_repository warning. Tests cover this behavior for staged, unstaged, and commit-range resolution from a subdirectory, including paths with Windows separators.

Changes

Pathspec Boundary Check

Layer / File(s)	Summary
Detect and reject escaping pathspecs diffgraph/git_snapshot.py, tests/test_git_snapshot.py	A helper checks pathspecs after handling Git pathspec magic and Windows separators. The resolver rejects relative paths that escape the repository and reports a warning. Tests cover staged, unstaged, and commit-range resolution.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 5769c

Escaping relative pathspecs now receive the intended warning across the stated modes. No actionable merge-blocking issue was identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: rejecting relative pathspecs that resolve outside the repository.
Docstring Coverage	✅ Passed	Docstring coverage is 87.50% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 2 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Inline comments:
In `@diffgraph/git_snapshot.py`:
- Line 530: Update _pathspec_escapes_repository to normalize the path portion
before checking for repository escapes: on Windows, convert backslashes to
forward slashes, then apply POSIX normalization before the existing
parent-directory checks. Preserve the original pathspec for warning output.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 333dc0d7-ecc1-46e4-84dd-b1376fc33eba

📥 Commits

Reviewing files that changed from the base of the PR and between 296b1c5 and 76924e2.

📒 Files selected for processing (2)

• diffgraph/git_snapshot.py
• tests/test_git_snapshot.py

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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