`git init` compatibility, `Git.version()` #491

tony · 2025-05-11T11:18:28Z

Problem

git init compatibility issues
no uniform way to check and compare git --version

Details

  Issue Summary

  The libvcs test suite is failing with newer Git versions (2.43.0 and later) due to changes in how Git handles repository initialization. Specifically, tests fail with:

  libvcs.exc.CommandError: Command failed with code 1: git init empty_git_repo

  What Changed in Git Init

  Git has progressively evolved its git init command behavior across versions:

  1. Git 2.28.0 (July 2020) introduced the ability to configure the default branch name with the init.defaultBranch config option.
  2. Git 2.30.0 (December 2020) added the -b/--initial-branch option to explicitly specify the initial branch name.
  3. Newer releases have tightened the behavior around initialization, with Git 2.43.0 potentially being more strict about directory existence or permissions.

  The error occurs in libvcs's _create_git_remote_repo function, which uses:

  run(
      ["git", "init", remote_repo_path.stem, *init_cmd_args],
      cwd=remote_repo_path.parent,
  )

  Without specifying an initial branch name, this command now fails on newer Git versions.

  Recommended Patch for libvcs

  Here's the fix needed in src/libvcs/pytest_plugin.py:

  def _create_git_remote_repo(
      remote_repo_path: pathlib.Path,
      remote_repo_post_init: CreateRepoPostInitFn | None = None,
      init_cmd_args: InitCmdArgs = DEFAULT_GIT_REMOTE_REPO_CMD_ARGS,
      env: _ENV | None = None,
  ) -> pathlib.Path:
      if init_cmd_args is None:
          init_cmd_args = []

      # Create the command with initial branch explicitly set to 'main'
      # This works with all Git versions
      git_cmd = ["git", "init"]

      # Add -b option for initial branch name (compatible with Git 2.30.0+)
      git_version_output = run(["git", "--version"], check_returncode=False)
      try:
          if git_version_output and git_version_output.output:
              # Add -b option only for Git versions that support it
              git_cmd.extend(["-b", "main"])
      except Exception:
          # If version check fails, try without -b option
          pass

      # Add repository path and any additional arguments
      git_cmd.extend([remote_repo_path.stem, *init_cmd_args])

      # Run the git init command
      run(
          git_cmd,
          cwd=remote_repo_path.parent,
          env=env,
      )

      if remote_repo_post_init is not None and callable(remote_repo_post_init):
          remote_repo_post_init(remote_repo_path=remote_repo_path, env=env)

      return remote_repo_path

  Alternative Simpler Patch

  If backward compatibility with very old Git versions isn't required, a simpler fix is:

  def _create_git_remote_repo(
      remote_repo_path: pathlib.Path,
      remote_repo_post_init: CreateRepoPostInitFn | None = None,
      init_cmd_args: InitCmdArgs = DEFAULT_GIT_REMOTE_REPO_CMD_ARGS,
      env: _ENV | None = None,
  ) -> pathlib.Path:
      if init_cmd_args is None:
          init_cmd_args = []

      # Always use -b option to specify initial branch explicitly
      run(
          ["git", "init", "-b", "main", remote_repo_path.stem, *init_cmd_args],
          cwd=remote_repo_path.parent,
          env=env,
      )

      if remote_repo_post_init is not None and callable(remote_repo_post_init):
          remote_repo_post_init(remote_repo_path=remote_repo_path, env=env)

      return remote_repo_path

  Explanation for Maintainers

  This patch addresses compatibility issues with modern Git versions while maintaining backward compatibility with older versions. The problem occurs because newer Git versions are more particular about branch naming conventions
  and initialization parameters.

  The test suite may pass when running individual test files but fail when running the entire suite because of how fixture caching works in pytest - when running single files, tests might use already-created repositories, but the
  full suite likely tries to create fresh repositories, triggering the Git init failure.

Summary by Sourcery

Improve git compatibility by introducing internal version parsing utilities and updating documentation with project standards and workflows.

New Features:

Add internal version parsing and comparison utilities for consistent handling of git version strings.

Enhancements:

Introduce vendored modules for version and structure handling to improve compatibility and version checks.

Documentation:

Add CLAUDE.md with detailed project guidelines, development workflow, and coding standards.

sourcery-ai · 2025-05-11T11:18:33Z

Reviewer's Guide

This pull request introduces a vendorized version parsing module to enable uniform Git version comparison and improve git init compatibility, and adds a CLAUDE.md file with detailed project and contribution guidelines.

Class Diagram for Structure Types (_structures.py)

classDiagram
    class InfinityType {
        +__repr__() str
        +__hash__() int
        +__lt__(other: object) bool
        +__le__(other: object) bool
        +__eq__(other: object) bool
        +__gt__(other: object) bool
        +__ge__(other: object) bool
        +__neg__() NegativeInfinityType
    }
    class NegativeInfinityType {
        +__repr__() str
        +__hash__() int
        +__lt__(other: object) bool
        +__le__(other: object) bool
        +__eq__(other: object) bool
        +__gt__(other: object) bool
        +__ge__(other: object) bool
        +__neg__() InfinityType
    }
    note "Defines Infinity and NegativeInfinity types and instances (Infinity, NegativeInfinity) used in version comparison logic."

File-Level Changes

Change	Details	Files
Vendorized version parsing and comparison utilities were added to support uniform handling of Git versions.	Added src/libvcs/_vendor/version.py, a backport of packaging.version for version parsing and comparison. Added src/libvcs/_vendor/_structures.py, providing Infinity and NegativeInfinity types for version sorting logic.	`src/libvcs/_vendor/version.py` `src/libvcs/_vendor/_structures.py`
Project documentation and contribution guidelines for Claude were introduced.	Added CLAUDE.md with critical requirements, development workflow, architecture overview, testing strategy, coding standards, and debugging tips.	`CLAUDE.md`

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codecov · 2025-05-11T11:19:16Z

Codecov Report

Attention: Patch coverage is 73.50993% with 80 lines in your changes missing coverage. Please review.

Project coverage is 55.59%. Comparing base (0f132c1) to head (28bf62b).

Files with missing lines	Patch %	Lines
src/libvcs/_vendor/version.py	60.50%	48 Missing and 14 partials ⚠️
src/libvcs/_vendor/_structures.py	56.25%	14 Missing ⚠️
src/libvcs/cmd/git.py	93.33%	1 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #491      +/-   ##
==========================================
+ Coverage   54.09%   55.59%   +1.50%     
==========================================
  Files          40       42       +2     
  Lines        3627     3921     +294     
  Branches      793      823      +30     
==========================================
+ Hits         1962     2180     +218     
- Misses       1314     1375      +61     
- Partials      351      366      +15

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

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❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

sourcery-ai

Hey @tony - I've reviewed your changes and they look great!

Here's what I looked at during the review

🟡 General issues: 1 issue found
🟢 Security: all looks good
🟢 Testing: all looks good
🟢 Documentation: all looks good

Sourcery is free for open source - if you like our reviews please consider sharing them ✨

_{Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.}

sourcery-ai · 2025-05-11T11:25:33Z

CLAUDE.md

+When stuck in debugging loops:
+
+1. **Pause and acknowledge the loop**
+2. **Minimize to MVP**: Remove all debugging cruft and experimental code


issue (typo): Potential Markdown formatting typo.

There's an extra asterisk in MVP**:. For proper bolding use **MVP**:.

Suggested change

2. **Minimize to MVP**: Remove all debugging cruft and experimental code

2. Minimize to **MVP**: Remove all debugging cruft and experimental code

sourcery-ai · 2025-05-11T11:25:33Z

src/libvcs/_vendor/version.py

+    """Take a string like abc.1.twelve and turns it into ("abc", 1, "twelve")."""
+    if local is not None:
+        return tuple(
+            part.lower() if not part.isdigit() else int(part)


suggestion (code-quality): Swap if/else branches of if expression to remove negation (swap-if-expression)

Suggested change

part.lower() if not part.isdigit() else int(part)

int(part) if part.isdigit() else part.lower()

Explanation
Negated conditions are more difficult to read than positive ones, so it is best
to avoid them where we can. By swapping the if and else conditions around we
can invert the condition and make it positive.

sourcery-ai · 2025-05-11T11:25:34Z

src/libvcs/_vendor/version.py

+    if not letter and number:
+        # We assume if we are given a number, but we are not given a letter
+        # then this is using the implicit post release syntax (e.g. 1.0-1)
+        letter = "post"
+
+        return letter, int(number)
+
+    return None


suggestion (code-quality): We've found these issues:

Remove redundant conditional (remove-redundant-if)

Lift code into else after jump in control flow (reintroduce-else)

Replace if statement with if expression (assign-if-exp)

Inline variable that is only used once (inline-variable)

Suggested change

if not letter and number:

# We assume if we are given a number, but we are not given a letter

# then this is using the implicit post release syntax (e.g. 1.0-1)

letter = "post"

return letter, int(number)

return None

return ("post", int(number)) if number else None

sourcery-ai · 2025-05-11T11:25:34Z

src/libvcs/_vendor/version.py

+        pre_ = pre
+
+    # Versions without a post segment should sort before those with one.
+    if post is None:


issue (code-quality): Replace if statement with if expression [×2] (assign-if-exp)

- Add GitVersionInfo dataclass to provide structured git version output - Update version() method to return raw string output - Add build_options() method that returns a GitVersionInfo instance - Fix doctests in vendored version module - Use internal vendor.version module instead of external packaging

See also: - uv: - https://github.com/astral-sh/uv/releases/tag/0.7.5 - https://github.com/astral-sh/uv/blob/0.7.5/CHANGELOG.md

sourcery-ai bot reviewed May 11, 2025

View reviewed changes

tony force-pushed the git-init-compatibility branch 3 times, most recently from 97f05af to 0698864 Compare May 11, 2025 21:29

tony added 12 commits May 17, 2025 06:49

pyproject(doctest) Use list, reruns

2345aeb

ai(rules[claude]) Add CLAUDE.md for claude code

8abeebd

ai(rules[claude]) Update instructions

975feca

_vendor: Add Version object from packaging

38c8ec7

docs(CHANGES) Note version()

56aff59

!squash more

b36b939

!squash test_git

a863883

docs(CHANGES) Note version() returning Version

f1a5e76

!squash git version

ebf115a

docs(CHANGES) Note version() returning Version

3c854f7

docs(MIGRATION) Note version() returning Version

544534a

tony force-pushed the git-init-compatibility branch from 0698864 to 544534a Compare May 17, 2025 11:49

.tool-versions(uv) uv 0.7.3 -> 0.7.5

28bf62b

See also: - uv: - https://github.com/astral-sh/uv/releases/tag/0.7.5 - https://github.com/astral-sh/uv/blob/0.7.5/CHANGELOG.md

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`git init` compatibility, `Git.version()` #491

`git init` compatibility, `Git.version()` #491

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	2. Minimize to MVP: Remove all debugging cruft and experimental code
	2. Minimize to MVP: Remove all debugging cruft and experimental code

	part.lower() if not part.isdigit() else int(part)
	int(part) if part.isdigit() else part.lower()

git init compatibility, Git.version() #491

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git init compatibility, Git.version() #491

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Reviewer's Guide

Class Diagram for Structure Types (_structures.py)

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`git init` compatibility, `Git.version()` #491

`git init` compatibility, `Git.version()` #491

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