Add git_evtag_py

Author: bbhtt

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: main
+    paths-ignore:
+      - '.gitignore'
+      - 'LICENSE'
+      - 'README.md'
+  pull_request:
+    branches: main
+    paths-ignore:
+      - '.gitignore'
+      - 'LICENSE'
+      - 'README.md'
+  workflow_dispatch:
+
+jobs:
+  ci:
+    permissions:
+      contents: read
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    concurrency:
+      group: ci-${{ matrix.platform }}-${{ github.ref }}
+      cancel-in-progress: true
+    steps:
+        # 4.2.2
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38
+
+      - name: Install uv
+        # 5.4.0
+        uses: astral-sh/setup-uv@22695119d769bdb6f7032ad67b9bca0ef8c4a174
+        with:
+          version: "0.7.5"
+          enable-cache: true
+          cache-dependency-glob: |
+            **/uv.lock
+            **/pyproject.toml
+
+      - name: Install dependencies
+        run: |
+           sudo apt-get update && sudo apt-get install -y \
+            --no-install-recommends git
+
+      - name: Install python dependencies
+        run: uv sync -v --all-groups --frozen
+
+      - name: Check code formatting
+        run: uv run ruff format --check
+
+      - name: Lint
+        run: uv run ruff check --output-format=github
+
+      - name: Check python types
+        run: uv run mypy .

.gitignore

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+__pycache__
+.mypy_cache
+.ruff_cache
+venv
+.venv

.pre-commit-config.yaml

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+default_install_hook_types:
+  - pre-commit
+default_stages:
+  - pre-commit
+fail_fast: true
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: cef0300fd0fc4d2a87a85fa2093c6b283ea36f4b
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-added-large-files
+        args: ['--maxkb=100']
+      - id: check-shebang-scripts-are-executable
+      - id: check-executables-have-shebangs
+      - id: check-symlinks
+      - id: mixed-line-ending
+        args: [--fix=lf]
+
+  - repo: local
+    hooks:
+      - id: uv-lock
+        name: uv lock
+        description: Sync uv lock
+        entry: uv lock --quiet
+        language: python
+        pass_filenames: false
+      - id: ruff-format
+        name: ruff format
+        description: Format with ruff
+        entry: uv run --frozen -q ruff format
+        language: system
+        pass_filenames: false
+      - id: ruff-check
+        name: ruff
+        description: Lint with ruff
+        entry: uv run --frozen -q ruff check --fix --exit-non-zero-on-fix
+        language: system
+        pass_filenames: false
+      - id: mypy-check
+        name: mypy
+        description: Check types with mypy
+        entry: uv run --frozen -q mypy .
+        language: system
+        pass_filenames: false
+        files: \.py$

LICENSE

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+### git_evtag_py
+
+A python script version of [git-evtag](https://github.com/cgwalters/git-evtag/),
+inspired by the [upstream Python implementation](https://github.com/cgwalters/git-evtag/blob/7c58b2021a066f1e552deeb37431bc70b6215d62/src/git-evtag-compute-py) but more feature complete and faster.
+
+This can,
+
+- Calculate and show checksum
+- Verify checksum of a tag against the one in the tag message
+- Sign a tag with the checksum
+
+
+### Usage
+
+Install `git`.
+
+Symlink `git-evtag` to `~/.local/bin/git-evtag` or somewhere else that is in
+`$PATH`. Then,
+
+```sh
+$ git evtag -h
+usage: git-evtag [-h] [--rev REV] [--repo REPO] [--verify VERIFY] [--sign SIGN] [--compat]
+
+Tree checksum of a git repository
+
+options:
+  -h, --help       show this help message and exit
+  --rev REV        Git revision (default: HEAD)
+  --repo REPO      Path to the git repository (default: current dir)
+  --verify VERIFY  Verify the tree checksum from the input tag message
+  --sign SIGN      Sign the input tag with the tree checksum
+  --compat         Produce 'git-evtag' upstream output
+
+```
+
+### Development
+
+```sh
+uv run ruff format
+uv run ruff check --fix --exit-non-zero-on-fix
+uv run mypy .
+```

README.md

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+git_evtag_py.py