195 lines
6.7 KiB
Nix
195 lines
6.7 KiB
Nix
{ fetchgit, fetchurl, lib, runCommand, cargo, jq }:
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{
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# Cargo lock file
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lockFile ? null
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# Cargo lock file contents as string
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, lockFileContents ? null
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# Hashes for git dependencies.
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, outputHashes ? {}
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} @ args:
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assert (lockFile == null) != (lockFileContents == null);
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let
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# Parse a git source into different components.
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parseGit = src:
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let
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parts = builtins.match ''git\+([^?]+)(\?(rev|tag|branch)=(.*))?#(.*)'' src;
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type = builtins.elemAt parts 2; # rev, tag or branch
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value = builtins.elemAt parts 3;
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in
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if parts == null then null
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else {
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url = builtins.elemAt parts 0;
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sha = builtins.elemAt parts 4;
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} // lib.optionalAttrs (type != null) { inherit type value; };
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# shadows args.lockFileContents
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lockFileContents =
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if lockFile != null
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then builtins.readFile lockFile
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else args.lockFileContents;
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packages = (builtins.fromTOML lockFileContents).package;
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# There is no source attribute for the source package itself. But
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# since we do not want to vendor the source package anyway, we can
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# safely skip it.
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depPackages = (builtins.filter (p: p ? "source") packages);
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# Create dependent crates from packages.
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#
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# Force evaluation of the git SHA -> hash mapping, so that an error is
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# thrown if there are stale hashes. We cannot rely on gitShaOutputHash
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# being evaluated otherwise, since there could be no git dependencies.
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depCrates = builtins.deepSeq (gitShaOutputHash) (builtins.map mkCrate depPackages);
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# Map package name + version to git commit SHA for packages with a git source.
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namesGitShas = builtins.listToAttrs (
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builtins.map nameGitSha (builtins.filter (pkg: lib.hasPrefix "git+" pkg.source) depPackages)
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);
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nameGitSha = pkg: let gitParts = parseGit pkg.source; in {
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name = "${pkg.name}-${pkg.version}";
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value = gitParts.sha;
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};
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# Convert the attrset provided through the `outputHashes` argument to a
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# a mapping from git commit SHA -> output hash.
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#
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# There may be multiple different packages with different names
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# originating from the same git repository (typically a Cargo
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# workspace). By using the git commit SHA as a universal identifier,
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# the user does not have to specify the output hash for every package
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# individually.
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gitShaOutputHash = lib.mapAttrs' (nameVer: hash:
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let
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unusedHash = throw "A hash was specified for ${nameVer}, but there is no corresponding git dependency.";
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rev = namesGitShas.${nameVer} or unusedHash; in {
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name = rev;
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value = hash;
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}) outputHashes;
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# We can't use the existing fetchCrate function, since it uses a
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# recursive hash of the unpacked crate.
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fetchCrate = pkg:
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assert lib.assertMsg (pkg ? checksum) ''
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Package ${pkg.name} does not have a checksum.
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Please note that the Cargo.lock format where checksums used to be listed
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under [metadata] is not supported.
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If that is the case, running `cargo update` with a recent toolchain will
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automatically update the format along with the crate's depenendencies.
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'';
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fetchurl {
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name = "crate-${pkg.name}-${pkg.version}.tar.gz";
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url = "https://crates.io/api/v1/crates/${pkg.name}/${pkg.version}/download";
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sha256 = pkg.checksum;
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};
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# Fetch and unpack a crate.
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mkCrate = pkg:
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let
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gitParts = parseGit pkg.source;
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in
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if pkg.source == "registry+https://github.com/rust-lang/crates.io-index" then
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let
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crateTarball = fetchCrate pkg;
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in runCommand "${pkg.name}-${pkg.version}" {} ''
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mkdir $out
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tar xf "${crateTarball}" -C $out --strip-components=1
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# Cargo is happy with largely empty metadata.
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printf '{"files":{},"package":"${pkg.checksum}"}' > "$out/.cargo-checksum.json"
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''
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else if gitParts != null then
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let
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missingHash = throw ''
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No hash was found while vendoring the git dependency ${pkg.name}-${pkg.version}. You can add
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a hash through the `outputHashes` argument of `importCargoLock`:
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outputHashes = {
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"${pkg.name}-${pkg.version}" = "<hash>";
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};
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If you use `buildRustPackage`, you can add this attribute to the `cargoLock`
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attribute set.
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'';
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sha256 = gitShaOutputHash.${gitParts.sha} or missingHash;
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tree = fetchgit {
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inherit sha256;
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inherit (gitParts) url;
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rev = gitParts.sha; # The commit SHA is always available.
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};
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in runCommand "${pkg.name}-${pkg.version}" {} ''
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tree=${tree}
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if grep --quiet '\[workspace\]' "$tree/Cargo.toml"; then
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# If the target package is in a workspace, find the crate path
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# using `cargo metadata`.
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crateCargoTOML=$(${cargo}/bin/cargo metadata --format-version 1 --no-deps --manifest-path $tree/Cargo.toml | \
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${jq}/bin/jq -r '.packages[] | select(.name == "${pkg.name}") | .manifest_path')
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if [[ ! -z $crateCargoTOML ]]; then
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tree=$(dirname $crateCargoTOML)
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else
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>&2 echo "Cannot find path for crate '${pkg.name}-${pkg.version}' in the Cargo workspace in: $tree"
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exit 1
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fi
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fi
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cp -prvd "$tree/" $out
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chmod u+w $out
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# Cargo is happy with empty metadata.
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printf '{"files":{},"package":null}' > "$out/.cargo-checksum.json"
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# Set up configuration for the vendor directory.
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cat > $out/.cargo-config <<EOF
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[source."${gitParts.url}"]
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git = "${gitParts.url}"
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${lib.optionalString (gitParts ? type) "${gitParts.type} = \"${gitParts.value}\""}
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replace-with = "vendored-sources"
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EOF
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''
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else throw "Cannot handle crate source: ${pkg.source}";
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vendorDir = runCommand "cargo-vendor-dir" (lib.optionalAttrs (lockFile == null) {
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inherit lockFileContents;
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passAsFile = [ "lockFileContents" ];
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}) ''
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mkdir -p $out/.cargo
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${
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if lockFile != null
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then "ln -s ${lockFile} $out/Cargo.lock"
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else "cp $lockFileContentsPath $out/Cargo.lock"
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}
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cat > $out/.cargo/config <<EOF
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[source.crates-io]
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replace-with = "vendored-sources"
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[source.vendored-sources]
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directory = "cargo-vendor-dir"
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EOF
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declare -A keysSeen
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for crate in ${toString depCrates}; do
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# Link the crate directory, removing the output path hash from the destination.
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ln -s "$crate" $out/$(basename "$crate" | cut -c 34-)
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if [ -e "$crate/.cargo-config" ]; then
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key=$(sed 's/\[source\."\(.*\)"\]/\1/; t; d' < "$crate/.cargo-config")
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if [[ -z ''${keysSeen[$key]} ]]; then
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keysSeen[$key]=1
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cat "$crate/.cargo-config" >> $out/.cargo/config
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fi
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fi
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done
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'';
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in
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vendorDir
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