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update-rust-derivation

Update Rust derivations in Nix with correct hashes and build verification.

7|Updated Aug 9, 2020
Search Tags:#nix#rust#update#nixpkgs#derivation#cargoHash
One-click install
npx skills add https://github.com/shinzui/dotfiles.nix --skill update-rust-derivation
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: update-rust-derivation
Source: https://github.com/shinzui/dotfiles.nix/tree/main/claude/skills/update-rust-derivation
Command: npx skills add https://github.com/shinzui/dotfiles.nix --skill update-rust-derivation

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Update a Rust derivation in Nix to a new version and ensure the corresponding hashes are updated for reproducible builds.

Core Features & Use Cases

  • Version bumping: update the version attribute in fetchFromGitHub and related fields.
  • Hash reconciliation: fetch new tarball hash, convert to SRI, and apply to the derivation.
  • Build verification: set cargoHash to a placeholder, run a build to reveal the correct cargoHash, then update it and re-build to verify success.

Quick Start

Use the update-rust-derivation skill to bump a Rust package version in a Nix derivation and refresh the hashes.

Frequently Asked Questions about update-rust-derivation

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I update a Rust derivation in nixpkgs to a new version?▼

To update a Rust derivation, you bump the version attribute in fetchFromGitHub, prefetch the new source tarball, convert the hash to SRI format, and update the derivation fields for reproducible builds.

How do I calculate the correct cargoHash for a rustPlatform.buildRustPackage?▼

To calculate the correct cargoHash, set it to a placeholder value, run a build to reveal the expected hash from the build error, update the derivation with the correct hash, and re-build to verify success.

Why does my Nix Rust build fail with a hash mismatch after a version bump?▼

A Nix Rust build fails with a hash mismatch after a version bump because the source tarball hash and cargoHash must be updated to reflect the new dependencies and source code changes.

What is the process for converting a fetched tarball hash to SRI format in Nix?▼

Converting a fetched tarball hash to SRI format in Nix involves prefetching the source and transforming the resulting hash into the SRI representation required by the derivation for integrity verification.

When do I need to update cargoHash instead of just the source hash in a Nix expression?▼

You need to update cargoHash instead of just the source hash when maintaining Nix expressions for Rust packages where dependency changes occur, ensuring rustPlatform.buildRustPackage fetches the correct cargo vendor archive.

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