Rahul Butani rrbutani

First you need to run echo "test" > /tmp/foo.

Running bazel build @repo//... will print "running repo rule".

Touching test_file and then bazel build @repo//... will not do anything; the repo rule is not rerun and the artifacts in @repo are not rebuilt.

Modifying test_file will cause the workspace rule to be rerun.

if you make a change that yields a different BUILD.bazel file then artifacts will be rebuilt (i.e. changing the first line of test_file)
if you make a change that still yields the same BUILD.bazel file no actions will be run (i.e adding extra lines, whitespace to test_file)

	{ lib }: {
	# Given an attrset of derivations of interest, returns an attrset where each
	# corresponding key is the full list of deps for the derivation.
	#
	# Note: this is far from perfect; this function only walks the usual
	# `mkDerivation` dependency list attributes so it'll miss dependencies in
	# strings.
	collectDeps = pkgSet: let
	# dbg = x: builtins.trace (builtins.typeOf x) (builtins.trace x x);
	d = path: builtins.unsafeDiscardStringContext path;

	{ lib ? import <nixpkgs/lib>, pkgs ? import <nixpkgs> { config.checkMeta = true; }, config ? pkgs.config }: let

	extendedMetaAttrs = [ "agsRoles" ];

	removeExtendedFromMeta = attrs: attrs // (lib.optionalAttrs (attrs ? meta) {
	meta = builtins.removeAttrs attrs.meta extendedMetaAttrs;
	});
	getExtendedMeta = attrs: lib.filterAttrs
	(n: _: builtins.elem n extendedMetaAttrs)
	(attrs.meta or {})

	{ pkgs ? import ./. {} }: let
	overlay = f: p: let base = p.llvmPackages_15; in {
	llvmPackages_15 = let
	patch = f.fetchpatch {
	url = "https://github.com/llvm/llvm-project/commit/57c7bb3ec89565c68f858d316504668f9d214d59.patch";
	hash = "sha256-AaM9A6tQ4YAw7uDqCIV4VaiUyLZv+unwcOqbakwW9/k=";
	relative = "libcxx";
	};

	tools = base.tools;


	// We want to slice and dice our opcode map on:
	// - opcode byte
	// - opcode map (aka leading opcode bytes; if present)
	// - prefixes
	//
	// Unfortunately, C doesn't have pattern matching. The macros that follow are
	// our (unfortunate) facsimile.
	//
	// Essentially we are — in the style of `disas_insn` — appropriating the upper

	#! /usr/bin/env nix-shell
	#! nix-shell -i bash -p bash coreutils procps cpuset which

	# shellcheck shell=bash

	# Based on suggestions from here: https://llvm.org/docs/Benchmarking.html.
	# Also see: https://juliaci.github.io/BenchmarkTools.jl/dev/linuxtips/.
	# And: https://man7.org/linux/man-pages/man7/cpuset.7.html.

	set -euo pipefail

	{
	inputs = {
	nixpkgs-working.url = github:NixOS/nixpkgs/2ebb6c1e5ae402ba35cca5eec58385e5f1adea04;
	nixpkgs-broken.url = github:NixOS/nixpkgs/nixos-unstable; # d917136f550a8c36efb1724390c7245105f79023 as of this writing

	nixpkgs-test.url = github:NixOS/nixpkgs/2fe19fe24a225c33c4011ee9dbc0b4310b798134;
	};

	outputs = { self, nixpkgs-working, nixpkgs-broken, nixpkgs-test }: let
	old = nixpkgs-working.legacyPackages.x86_64-linux;

	//! Implementation of the [Playfair cipher].
	//!
	//! [Playfair cipher]: https://en.wikipedia.org/wiki/Playfair_cipher

	#![cfg_attr(feature = "no_std", no_std)]
	#![cfg_attr(all(docs, not(doctest)), feature(doc_auto_cfg))]

	use core::fmt::{self, Display};

	// Normally we'd use a `std` feature instead of a `no_std` feature (this works

	...

	see the revision history for lock files, if required