PyTail

pytail is a small PyPI caching proxy. It exposes a Python Simple Repository API endpoint, fetches packages from upstream on demand, and keeps downloaded files in a local cache.

It is useful when you want faster repeated installs, a simple shared package cache, or a local endpoint for PyPI and PyTorch wheel indexes.

Features

PyPI-compatible /simple/ endpoint for pip and uv
lazy caching of project pages and package files
optional cache size limit with least-recently-used cleanup
PyTorch wheel index proxy under /pytorch-wheels/
HTML and JSON Simple API responses

Install

Install from PyPI:

pip install pytail

Or install from source:

cargo install --path .

Run

After installation:

pytail \
  --bind 127.0.0.1:3141 \
  --cache-dir .cache/pytail

From a source checkout:

cargo run -- \
  --bind 127.0.0.1:3141 \
  --cache-dir .cache/pytail

Then use it as the package index:

uv pip install --index-url http://127.0.0.1:3141/simple/ requests
pip install --index-url http://127.0.0.1:3141/simple/ requests

Open the local index in a browser:

http://127.0.0.1:3141/simple/

PyTorch Wheels

PyTorch wheel indexes are available under /pytorch-wheels/.

For example, this upstream command:

pip install torch --index-url https://download.pytorch.org/whl/cu126

can use the local cache instead:

pip install torch --index-url http://127.0.0.1:3141/pytorch-wheels/cu126

If a package needs both PyTorch wheels and normal PyPI packages:

pip install torch \
  --index-url http://127.0.0.1:3141/pytorch-wheels/cu126 \
  --extra-index-url http://127.0.0.1:3141/simple/

Options

Common options:

--bind: listen address, default 127.0.0.1:3141
--cache-dir: cache directory, default .cache/pytail
--cache-max-size: max file cache size, default 0 for unlimited; examples: 512MiB, 2G, 10GB
--upstream-base-url: PyPI-compatible upstream, default https://pypi.org
--torch-url: PyTorch wheel upstream, default https://download.pytorch.org/whl/
--project-cache-ttl-secs: project page refresh interval, default 900
--request-timeout-secs: upstream request timeout, default 15
--verbose: enable debug logs

Build

Build the Rust binary:

cargo build --release

Build a Python wheel with maturin:

maturin build --release

The wheel installs the pytail command.

Development Status
- 3 - Alpha
Environment
- Console
Intended Audience
- Developers
Programming Language
- Rust
Topic
- Software Development :: Build Tools
- System :: Archiving :: Mirroring

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