easyenv-cli 0.1.2

Ephemeral, reproducible, cached development environment

EasyEnv CLI

Ephemeral, reproducible, cached development environments

EasyEnv CLI is a CLI/TUI tool for creating "one-off" but reproducible and cached development environments. One command → ready env → run user command → keep system clean.

Features

• 🚀 Instant ephemeral environments - Create isolated Python environments on-demand
• 🔒 Reproducible builds - Lock files ensure byte-for-byte reproducibility
• 💾 Smart caching - Reuse environments automatically with hash-based deduplication
• 🧹 Zero global pollution - Everything isolated in ~/.easyenv/cache
• 📦 Powered by uv - Lightning-fast package installation
• 🎯 Simple DSL - Human-readable specs: py=3.12 pkgs:requests==2.32.3
• 📊 SBOM generation - Automatic software bill of materials
• 🖥️ Optional TUI - Browse and manage cached environments

Installation

# Install uv first (if not already installed)
curl -LsSf https://astral.sh/uv/install.sh | sh

# Install EasyEnv CLI
pip install easyenv-cli
# or
pipx install easyenv-cli
# or (using uv)
uv tool install easyenv-cli

Quick Start

Run command in ephemeral environment

# Basic usage
easyenv-cli run "py=3.12 pkgs:requests==2.32.3" -- python -c "import requests; print('✓')"

# Multiple packages
easyenv-cli run "py=3.11 pkgs:requests,numpy,pandas" -- python script.py

# With version constraints
easyenv-cli run "py=3.12 pkgs:requests==2.32.3,pendulum~=3.0" -- python app.py

Prepare environment without running

# Pre-build for later use
easyenv-cli prepare "py=3.12 pkgs:ruff==0.7.2"

Using YAML specs

Create env.yaml:

python: "3.12"
packages:
  - "requests==2.32.3"
  - "pendulum~=3.0"
  - "numpy>=1.24.0"
scripts:
  post_install:
    - "python -c 'import requests; print(requests.__version__)'"
env:
  PANDAS_IGNORE_WARNING: "1"
  DEBUG: "true"

Run it:

easyenv-cli run env.yaml -- python my_script.py

Templates

# Save frequently-used specs as templates
easyenv-cli template add datasci "py=3.12 pkgs:numpy,pandas,matplotlib"
easyenv-cli template add testing "py=3.11 pkgs:pytest,coverage,ruff"

# Use templates
easyenv-cli use datasci -- jupyter lab
easyenv-cli use testing -- pytest tests/

# List templates
easyenv-cli template list

Cache management

# List cached environments
easyenv-cli list

# Show disk usage
easyenv-cli du

# Purge old environments
easyenv-cli purge --older-than 30d --dry-run
easyenv-cli purge --max-size 8GB

# Remove specific age
easyenv-cli purge --older-than 7d

Lock files for reproducibility

# Export lock file
easyenv-cli run "py=3.12 pkgs:requests" -- python -c "print('ok')"
easyenv-cli lock export abc123def456 -o production.lock.json

# Import lock file (reproduces exact environment)
easyenv-cli lock import production.lock.json

Diagnostics

# Check setup
easyenv-cli doctor

TUI (Terminal UI)

# Launch interactive cache browser
easyenv-cli tui

DSL Syntax

The EasyEnv DSL is a simple, space-separated format:

py=<version> pkgs:<pkg1>,<pkg2> extras:<label1>,<label2> flags:<k=v>

Components

• py=<version> (required) - Python version (e.g., 3.12, 3.11)
• pkgs:<packages> - Comma-separated package specs with version constraints
  • requests==2.32.3 - Exact version
  • numpy>=1.24.0 - Minimum version
  • pandas~=2.0 - Compatible version
• extras:<labels> - Custom labels for grouping
• flags:<k=v> - Key-value flags for future extensions

Examples

# Simple
py=3.12 pkgs:requests

# Multiple packages with versions
py=3.11 pkgs:requests==2.32.3,numpy>=1.24.0,pandas~=2.0

# With extras
py=3.12 pkgs:pytest,coverage extras:testing,ci

# Order doesn't matter
extras:dev pkgs:ruff py=3.12

YAML Format

For complex environments, use YAML:

python: "3.12"

packages:
  - "requests==2.32.3"
  - "numpy>=1.24.0"
  - "pandas~=2.0"

extras:
  - "dev"
  - "testing"

scripts:
  post_install:
    - "python -c 'import requests; print(requests.__version__)'"
    - "pytest --version"

env:
  DEBUG: "true"
  LOG_LEVEL: "info"
  CUSTOM_VAR: "value"

flags:
  optimize: "true"

How It Works

1. Parse spec - DSL or YAML → normalized specification
2. Compute hash - Stable hash from spec + platform + Python/UV versions
3. Check cache - Reuse if environment exists, otherwise create
4. Create environment - Use uv to create venv and install packages
5. Run command - Execute with PATH pointing to environment
6. Keep clean - No global modifications, all isolated in cache

Cache Structure

~/.easyenv/cache/
├── index.db           # SQLite index
├── abc123def456/      # Environment (hash-based)
│   ├── bin/          # Virtual environment
│   ├── meta.json     # Metadata
│   ├── bom.json      # SBOM
│   └── spec.yaml     # Original spec
└── xyz789ghi012/
    └── ...

CI Integration

GitHub Actions Example

name: Test with EasyEnv
on: [push, pull_request]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Install uv
        run: curl -LsSf https://astral.sh/uv/install.sh | sh

      - name: Install EasyEnv CLI
        run: pipx install easyenv-cli

      - name: Run tests
        run: |
          easyenv-cli run "py=3.12 pkgs:pytest,coverage" -- pytest -v

      - name: Lint
        run: |
          easyenv-cli run "py=3.12 pkgs:ruff" -- ruff check .

Configuration

EasyEnv CLI can be configured via ~/.config/easyenv/config.toml:

# Custom cache directory
cache_dir = "/custom/path/to/cache"

# Default Python version
default_python = "3.12"

# Purge policies
purge_older_than_days = 30
purge_max_size_gb = 10.0

# Defaults
verbose = false
offline = false

# Templates
[templates]
datasci = "py=3.12 pkgs:numpy,pandas,matplotlib"
webdev = "py=3.11 pkgs:flask,requests"

Advanced Usage

Offline mode

# Prepare environments first
easyenv-cli prepare "py=3.12 pkgs:requests" --offline

# Use offline (no network access)
easyenv-cli run "py=3.12 pkgs:requests" --offline -- python script.py

Custom index URLs

# Use private PyPI mirror
export UV_INDEX_URL="https://pypi.company.com/simple"
easyenv-cli run "py=3.12 pkgs:internal-package" -- python script.py

Verbose output

# See what's happening
easyenv-cli run "py=3.12 pkgs:requests" -v -- python script.py

Comparison

Tool	Ephemeral	Cached	Reproducible	Speed	Global Install
EasyEnv CLI	✅	✅	✅	⚡	❌
venv	❌	❌	⚠️	🐌	❌
Docker	✅	✅	✅	🐌	⚠️
nix	✅	✅	✅	⚡	⚠️

Roadmap

• Node/Bun runtime support
• Template registry (git-based)
• GitHub Actions cache integration
• Web-based cache browser
• Docker backend (optional)
• PowerToys Run / Flow Launcher integration

Requirements

• Python 3.11+
• uv (for environment creation)
• Linux, macOS, or Windows (WSL)

Development

# Clone repository
git clone https://github.com/yourusername/easyenv
cd easyenv

# Install in development mode
pip install -e ".[dev]"

# Run tests
pytest

# Type checking
mypy src/easyenv

# Linting
ruff check .

Releases

See CHANGELOG.md for release history.

For maintainers: See docs/RELEASE.md for release instructions.

Installation from PyPI

# Stable release
pip install easyenv-cli

# Specific version
pip install easyenv-cli==0.1.0

# Using uv (recommended)
uv tool install easyenv-cli

# From source
pip install git+https://github.com/ruslanlap/EasyEnv.git

License

MIT License - see LICENSE file for details.

Contributing

Contributions welcome! Please open an issue or PR.

Credits

Built with:

• uv - Fast Python package installer
• Typer - CLI framework
• Textual - TUI framework
• Pydantic - Data validation

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EasyEnv - One command, ready environment, clean system. 🚀