100 lines
3.3 KiB
Nix
100 lines
3.3 KiB
Nix
# If the tests are broken, it's probably for one of two reasons:
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#
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# 1. The version of llvm used doesn't match the expectations of rustc and/or
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# cargo-llvm-cov. This is relatively unlikely because we pull llvm out of
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# rustc's attrset, so it *should* be the right version as long as this is the
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# case.
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# 2. Nixpkgs has changed its rust infrastructure in a way that causes
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# cargo-llvm-cov to misbehave under test. It's likely that even though the
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# tests are failing, cargo-llvm-cov will still function properly in actual
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# use. This has happened before, and is described [here][0] (along with a
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# feature request that would fix this instance of the problem).
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#
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# For previous test-troubleshooting discussion, see [here][1].
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#
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# [0]: https://github.com/taiki-e/cargo-llvm-cov/issues/242
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# [1]: https://github.com/NixOS/nixpkgs/pull/197478
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{ stdenv
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, lib
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, fetchurl
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, fetchFromGitHub
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, rustPlatform
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, rustc
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, git
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}:
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let
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pname = "cargo-llvm-cov";
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version = "0.6.2";
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owner = "taiki-e";
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homepage = "https://github.com/${owner}/${pname}";
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llvm = rustc.llvmPackages.llvm;
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# Download `Cargo.lock` from crates.io so we don't clutter up Nixpkgs
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cargoLock = fetchurl {
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name = "Cargo.lock";
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url = "https://crates.io/api/v1/crates/${pname}/${version}/download";
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sha256 = "sha256-iML16yjSJsyDsr9F3gyp4XTu5Z9petSUQ0jXotU5tmw=";
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downloadToTemp = true;
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postFetch = ''
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tar xzf $downloadedFile ${pname}-${version}/Cargo.lock
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mv ${pname}-${version}/Cargo.lock $out
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'';
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};
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in
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rustPlatform.buildRustPackage {
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inherit pname version;
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# Use `fetchFromGitHub` instead of `fetchCrate` because the latter does not
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# pull in fixtures needed for the test suite
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src = fetchFromGitHub {
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inherit owner;
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repo = pname;
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rev = "v${version}";
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sha256 = "sha256-1VfWs8f4i3YjH69A7X3/1WPxSIwPRF5osQ/1eqOUB8U=";
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leaveDotGit = true;
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};
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# Upstream doesn't include the lockfile so we need to add it back
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postUnpack = ''
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cp ${cargoLock} source/Cargo.lock
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'';
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cargoSha256 = "sha256-9pOfhGnktEgyTbfK4roFU7t3qcgx2yRp17hJVKsvNqw=";
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# `cargo-llvm-cov` reads these environment variables to find these binaries,
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# which are needed to run the tests
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LLVM_COV = "${llvm}/bin/llvm-cov";
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LLVM_PROFDATA = "${llvm}/bin/llvm-profdata";
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nativeCheckInputs = [
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git
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];
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preCheck = ''
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# `cargo-llvm-cov`'s tests rely on `git ls-files` so the staging area needs
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# to not have everything staged as deleted, which is how `leaveDotGit` in
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# `fetchFromGitHub` leaves the staging area for reproducibility reasons.
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git restore --staged .
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'';
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meta = {
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inherit homepage;
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changelog = homepage + "/blob/v${version}/CHANGELOG.md";
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description = "Cargo subcommand to easily use LLVM source-based code coverage";
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longDescription = ''
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In order for this to work, you either need to run `rustup component add llvm-
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tools-preview` or install the `llvm-tools-preview` component using your Nix
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library (e.g. fenix or rust-overlay)
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'';
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license = with lib.licenses; [ asl20 /* or */ mit ];
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maintainers = with lib.maintainers; [ wucke13 matthiasbeyer CobaltCause ];
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# The profiler runtime is (currently) disabled on non-Linux platforms
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broken = !(stdenv.isLinux && !stdenv.targetPlatform.isRedox);
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};
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}
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