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Update a Rust derivation to a new version with correct hashes. Use when the user wants to update a Rust package in their nix derivations.
Codex 또는 Claude로 설치 이 Prompt를 복사해 Codex, Claude 또는 다른 어시스턴트에 붙여 넣으면 Skill 페이지를 검토하고 설치를 진행할 수 있습니다.
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| name | update-rust-derivation |
| description | Update a Rust derivation to a new version with correct hashes. Use when the user wants to update a Rust package in their nix derivations. |
Update the Rust derivation: $ARGUMENTS
Read the derivation: Read the derivation file to understand its current structure, version, and hash fields.
Update the version: Change the version attribute to the new version.
Get the source hash:
nix-prefetch-url --unpack "https://github.com/<owner>/<repo>/archive/refs/tags/v<version>.tar.gz"
Then convert to SRI format:
nix hash to-sri --type sha256 <hash>
Update the source hash: Replace the hash attribute in fetchFromGitHub with the new SRI hash.
Set cargoHash to placeholder: Temporarily set cargoHash = lib.fakeHash; to trigger nix to compute the correct hash.
Build to get cargoHash:
nix build --impure --expr 'let pkgs = import <nixpkgs> {}; in pkgs.callPackage ./<path-to-derivation> {}' 2>&1 | grep -A2 "got:"
Extract the correct cargoHash from the error output.
Update cargoHash: Replace lib.fakeHash with the actual cargoHash from the build output.
Verify the build:
nix build --impure --expr 'let pkgs = import <nixpkgs> {}; in pkgs.callPackage ./<path-to-derivation> {}'
Ensure the build completes successfully.
Summary: Report the version update (old -> new) and remind to run darwin-rebuild switch --flake . to apply changes.
rustPlatform.buildRustPackage with cargoHashcargoLock instead of cargoHash, the process differs (fetch Cargo.lock from repo)patches, buildInputs)