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Add updateToolchainManifest explanation

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Jelle Besseling 2022-02-20 21:56:52 +01:00
parent e3d40a1904
commit e25752c746
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15
flake.nix
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@ -68,6 +68,21 @@
inherit system;
overlays = [ nixpkgs-mozilla.overlays.rust self.overlay ];
};
# Script to update the toolchain-manifest.toml file which is used in the nix build.
#
# nixpkgs doesn't package rust nightly, so the Mozilla nixpkgs Rust overlay is used,
# which can download the rust toolchain if given a manifest file (a sha256 hash can also be used
# in which case the overlay downloads the manifest file with fetchurl).
# The nice thing about this manifest file is that the nix builds are fully hermetic.
# The downside is that now both nixpkgs needs to be updated (with nix flake update)
# and the toolchain manifest.
#
# To update the toolchain to the latest nightly, run
# $ nix develop
# $ updateToolchainManifest
# The script also accepts arguments for a different rust channel (first argument)
# or a specific nightly date (e.g. updateToolchainManifest nightly 2022-02-19)
updateToolchainManifest = pkgs.writeScriptBin "updateToolchainManifest" ''
#! /usr/bin/env bash