---
id: soldr
version: "0.9.0"
license: BSD-3-Clause
license_treatment: permissive
maintenance: active
---

# soldr — Instant tools. Instant builds. One command.

License: permissive · Maintenance: active · Downloads: 95.2K/mo

## What it is and what it does

Soldr combines Rust toolchain provisioning and compilation caching into a single command-line tool. It wraps Cargo to transparently cache build artifacts across runs and machines, with particular emphasis on sharing caches across pull requests and CI workflows—a capability that generic per-key caching cannot provide. The tool downloads the correct Rust toolset for your project (reading from rust-toolchain.toml if present), handles Windows ABI selection automatically, and layers zccache-backed artifact caching on top without requiring separate setup.

The package is distributed as a Python wheel that acts as a launcher; during installation it downloads the matching soldr binary for your OS and architecture, verifies it against published SHA256 checksums, and exposes the soldr command. It supports Intel and Apple Silicon macOS, Linux (x86_64 and aarch64), Windows (x86_64 and arm64), and integrates with GitHub Actions via a companion setup action. The tool is beta software and actively maintained, with recent releases and no known vulnerabilities.

Use it for:

- Accelerate CI builds by sharing warm compiler caches across feature branches and pull requests.
- Set up Rust tooling in GitHub Actions without manually managing rustup or separate toolchain actions.
- Speed up local cross-compilation and multi-target builds by reusing cached artifacts.
- Reduce cold-build time in clean-target scenarios where target/ is deleted between runs.
- Simplify Rust toolchain management across teams by centralizing tool fetch and cache configuration.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Soldr is a Python wrapper that downloads Rust toolsets and caches build artifacts to accelerate Rust compilation, particularly across pull requests and CI runs.

Yes, if you run Rust builds in CI or across multiple machines and want to reduce compilation time via cross-PR cache sharing. The active maintenance, permissive license, zero runtime dependencies, and no known vulnerabilities make it low-risk. Install with caution if your project uses non-standard Cargo setups; the fact sheet does not clarify compatibility with all workspace configurations. Pin the version (as the description recommends for beta software) until you validate it in your workflow.

## Install

pip install soldr
uv add soldr
poetry add soldr

## Installing soldr

Before you install: Medium install friction due to platform-specific wheels, but actively maintained with a recent release. No runtime dependencies simplifies installation. Requires Python 3.10 or later.

License in practice: BSD-3-Clause is permissive; you can use, modify, and redistribute soldr with minimal restrictions, provided you include the license notice.

Quickstart:

pip install soldr
soldr --version
soldr cargo build --locked --release

Requires Python 3.10 or later. Soldr is a wrapper around Rust tooling; you need Rust/Cargo installed or soldr will provision it.

Verify before relying:

- Whether soldr's caching works transparently with all Cargo workspaces or requires specific project structure.
- Performance gains on intact-target builds (where target/ is not deleted between runs).
- Compatibility with non-standard Cargo configurations or monorepos.

## Package facts

- License: BSD-3-Clause (permissive)
- Python support: supports_current
- Install friction: medium
- Maintenance: active
- Downloads: 95.2K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

rust build cache, rust toolchain installer, cargo build acceleration, rust ci caching, cross-pr build cache, rust compilation speedup, rust tool downloader, rust-tooling, ci-acceleration, build-cache

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