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# rust-overlay
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![CI](https://github.com/oxalica/rust-overlay/workflows/CI/badge.svg)
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![sync-channels](https://github.com/oxalica/rust-overlay/workflows/sync-channels/badge.svg)
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*Pure and reproducible* overlay for binary distributed rust toolchains.
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A compatible but better replacement for rust overlay of [mozilla/nixpkgs-mozilla][mozilla].
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Hashes of toolchain components are pre-fetched (and compressed) in tree (`manifests` directory),
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so the evaluation is *pure* and no need to have network (but [nixpkgs-mozilla][mozilla] does).
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It also works well with [Nix Flakes](https://nixos.wiki/wiki/Flakes).
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- The toolchain hashes are auto-updated daily using GitHub Actions.
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- Current oldest supported version is stable 1.29.0 and beta/nightly 2018-09-13
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(which are randomly chosen).
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## Use as a classic Nix overlay
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You can put the code below into your `~/.config/nixpkgs/overlays.nix`.
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```nix
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[ (import (builtins.fetchTarball "https://github.com/oxalica/rust-overlay/archive/master.tar.gz")) ]
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```
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Then the provided attribute paths are available in nix command.
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```bash
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$ nix-env -iA rust-bin.stable.latest.default # Do anything you like.
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```
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Alternatively, you can install it into nix channels.
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```bash
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$ nix-channel --add https://github.com/oxalica/rust-overlay/archive/master.tar.gz rust-overlay
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$ nix-channel --update
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```
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And then feel free to use it anywhere like
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`import <nixpkgs> { overlays = [ (import <rust-overlay>) ]; }` in your nix shell environment.
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## Use with Nix Flakes
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This repository already has flake support.
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NOTE: **Only the output `overlay` is stable and preferred to be used in your flake.**
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Other outputs like `packages` and `defaultPackage` are for human try and are subject to change.
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For a quick play, just use `nix shell` to bring the latest stable rust toolchain into scope.
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(All commands below requires preview version of Nix with flake support.)
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```shell
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$ nix shell github:oxalica/rust-overlay
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$ rustc --version
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rustc 1.49.0 (e1884a8e3 2020-12-29)
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$ cargo --version
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cargo 1.49.0 (d00d64df9 2020-12-05)
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```
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Here's an example of using it in nixos configuration.
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```nix
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{
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description = "My configuration";
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inputs = {
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nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
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rust-overlay.url = "github:oxalica/rust-overlay";
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};
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outputs = { nixpkgs, rust-overlay, ... }: {
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nixosConfigurations = {
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hostname = nixpkgs.lib.nixosSystem {
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system = "x86_64-linux";
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modules = [
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./configuration.nix # Your system configuration.
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({ pkgs, ... }: {
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nixpkgs.overlays = [ rust-overlay.overlay ];
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environment.systemPackages = [ pkgs.rust-bin.stable.latest.default ];
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})
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];
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};
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};
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};
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}
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```
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## Attributes provided by the overlay
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```nix
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{
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rust-bin = {
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# The default dist url for fetching.
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# Override it if you want to use a mirror server.
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distRoot = "https://static.rust-lang.org/dist";
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# Select a toolchain and aggregate components by rustup's `rust-toolchain` file format.
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# See: https://rust-lang.github.io/rustup/overrides.html#the-toolchain-file
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fromRustupToolchain = { channel, components ? [], targets ? [] }: «derivation»;
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# Same as `fromRustupToolchain` but read from a `rust-toolchain` file (legacy one-line string or in TOML).
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fromRustupToolchainFile = rust-toolchain-file-path: «derivation»;
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# [Experimental]
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# Custom toolchain from a specific rustc git revision.
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# This does almost the same thing as `rustup-toolchain-install-master`. (https://crates.io/crates/rustup-toolchain-install-master)
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# Parameter `components` should be an attrset with component name as key and its SRI hash as value.
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fromRustcRev = { pname ? .., rev, components, target ? .. }: «derivation»;
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stable = {
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# The latest stable toolchain.
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latest = {
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# [Experimental]
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# Profiles, predefined component sets.
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# See: https://rust-lang.github.io/rustup/concepts/profiles.html
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minimal = «derivation»; # Only `cargo`, `rustc` and `rust-std`.
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default = «derivation»; # The default profile of `rustup`. Good for general use.
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complete = «derivation»; # Do not use it. It almost always fails.
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# Pre-aggregated package provided by upstream, the most commonly used package in `mozilla-overlay`.
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# It consists of an uncertain number of components, usually more than the `default` profile of `rustup`
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# but less than `complete` profile.
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rust = «derivation»;
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# Individial components.
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rustc = «derivation»;
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cargo = «derivation»;
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rust-std = «derivation»;
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# ... other components
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};
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"1.49.0" = { /* toolchain */ };
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"1.48.0" = { /* toolchain */ };
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# ... other versions.
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};
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beta = {
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# The latest beta toolchain.
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latest = { /* toolchain */ };
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"2021-01-01" = { /* toolchain */ };
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"2020-12-30" = { /* toolchain */ };
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# ... other versions.
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};
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nightly = {
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# The latest nightly toolchain.
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latest = { /* toolchain */ };
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"2020-12-31" = { /* toolchain */ };
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"2020-12-30" = { /* toolchain */ };
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# ... other versions.
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};
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# ... Some internal attributes omitted.
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};
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# These are for compatibility with nixpkgs-mozilla and
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# provide same toolchains as `rust-bin.*`.
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latest.rustChannels = /* ... */;
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rustChannelOf = /* ... */;
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rustChannelOfTargets = /* ... */;
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rustChannels = /* ... */;
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}
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```
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Some examples (assume `nixpkgs` had the overlay applied):
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- Latest stable/beta/nightly rust with almost all components (provided the same as `mozilla-overlay`):
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`nixpkgs.rust-bin.{stable,beta,nightly}.latest.rust`
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- *\[Experimental\]*
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Latest stable/beta/nightly rust with `default` or `minimal` profile (provided the same as default behavior of `rustup install`).
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`nixpkgs.rust-bin.{stable,beta,nightly}.latest.{default,minimal}`
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Note: `default` profile on `nightly` may not always be available due to absense of required components.
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You can check availability on [Rustup packages availibility](https://rust-lang.github.io/rustup-components-history/).
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- A specific version of stable rust:
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`nixpkgs.rust-bin.stable."1.48.0".default`
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- A specific date of beta rust:
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`nixpkgs.rust-bin.beta."2021-01-01".default`
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- A specific date of nightly rust:
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`nixpkgs.rust-bin.nightly."2020-12-31".default`
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- Latest stable rust with additional component `rust-src` and extra target
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`arm-unknown-linux-gnueabihf`:
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```nix
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nixpkgs.rust-bin.stable.latest.default.override {
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extensions = [ "rust-src" ];
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targets = [ "arm-unknown-linux-gnueabihf" ];
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}
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```
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- If you already have a [`rust-toolchain` file for rustup][rust-toolchain],
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you can simply use `fromRustupToolchainFile` to get the customized toolchain derivation.
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```nix
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nixpkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain
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```
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- *\[Experimental\]*
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Toolchain with specific rustc git revision.
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This is useful for development of rust components like [MIRI](https://github.com/rust-lang/miri).
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Note: the example below may not built since upstream CI periodly removes old artifacts.
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```nix
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rust-bin.fromRustcRev {
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rev = "a2cd91ceb0f156cb442d75e12dc77c3d064cdde4";
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components = {
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rustc = "sha256-x+OkPVStX00AiC3GupIdGzWluIK1BnI4ZCBbg72+ZuI=";
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rust-src = "sha256-13PpzzYtd769Xkb0QzHpNfYCOnLMWFolc9QyYq98z2k=";
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};
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}
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```
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- See more examples in directory `examples`.
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For more details, see also the source code of `./rust-overlay.nix`.
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[mozilla]: https://github.com/mozilla/nixpkgs-mozilla
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[rust-toolchain]: https://rust-lang.github.io/rustup/overrides.html#the-toolchain-file
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