391 lines
14 KiB
Nix
391 lines
14 KiB
Nix
# Code for buildRustCrate, a Nix function that builds Rust code, just
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# like Cargo, but using Nix instead.
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#
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# This can be useful for deploying packages with NixOps, and to share
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# binary dependencies between projects.
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{ lib
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, stdenv
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, defaultCrateOverrides
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, fetchCrate
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, pkgsBuildBuild
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, rustc
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, rust
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, cargo
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, jq
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, libiconv
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}:
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let
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# Create rustc arguments to link against the given list of dependencies
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# and renames.
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#
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# See docs for crateRenames below.
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mkRustcDepArgs = dependencies: crateRenames:
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lib.concatMapStringsSep " "
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(dep:
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let
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normalizeName = lib.replaceStrings [ "-" ] [ "_" ];
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extern = normalizeName dep.libName;
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# Find a choice that matches in name and optionally version.
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findMatchOrUseExtern = choices:
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lib.findFirst
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(choice:
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(!(choice ? version)
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|| choice.version == dep.version or ""))
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{ rename = extern; }
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choices;
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name =
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if lib.hasAttr dep.crateName crateRenames then
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let choices = crateRenames.${dep.crateName};
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in
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normalizeName (
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if builtins.isList choices
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then (findMatchOrUseExtern choices).rename
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else choices
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)
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else
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extern;
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opts = lib.optionalString (dep.stdlib or false) "noprelude:";
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filename =
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if lib.any (x: x == "lib" || x == "rlib") dep.crateType
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then "${dep.metadata}.rlib"
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else "${dep.metadata}${stdenv.hostPlatform.extensions.sharedLibrary}";
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in
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" --extern ${opts}${name}=${dep.lib}/lib/lib${extern}-${filename}"
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)
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dependencies;
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# Create feature arguments for rustc.
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mkRustcFeatureArgs = lib.concatMapStringsSep " " (f: ''--cfg feature=\"${f}\"'');
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# Whether we need to use unstable command line flags
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#
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# Currently just needed for standard library dependencies, which have a
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# special "noprelude:" modifier. If in later versions of Rust this is
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# stabilized we can account for that here, too, so we don't opt into
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# instability unnecessarily.
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needUnstableCLI = dependencies:
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lib.any (dep: dep.stdlib or false) dependencies;
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inherit (import ./log.nix { inherit lib; }) noisily echo_colored;
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configureCrate = import ./configure-crate.nix {
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inherit lib stdenv rust echo_colored noisily mkRustcDepArgs mkRustcFeatureArgs;
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};
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buildCrate = import ./build-crate.nix {
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inherit lib stdenv mkRustcDepArgs mkRustcFeatureArgs needUnstableCLI rust;
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};
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installCrate = import ./install-crate.nix { inherit stdenv; };
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# Allow access to the rust attribute set from inside buildRustCrate, which
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# has a parameter that shadows the name.
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rustAttrs = rust;
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in
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/* The overridable pkgs.buildRustCrate function.
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*
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* Any unrecognized parameters will be passed as to
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* the underlying stdenv.mkDerivation.
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*/
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crate_: lib.makeOverridable
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(
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# The rust compiler to use.
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#
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# Default: pkgs.rustc
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{ rust
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# Whether to build a release version (`true`) or a debug
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# version (`false`). Debug versions are faster to build
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# but might be much slower at runtime.
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, release
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# Whether to print rustc invocations etc.
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#
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# Example: false
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# Default: true
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, verbose
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# A list of rust/cargo features to enable while building the crate.
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# Example: [ "std" "async" ]
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, features
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# Additional native build inputs for building this crate.
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, nativeBuildInputs
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# Additional build inputs for building this crate.
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#
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# Example: [ pkgs.openssl ]
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, buildInputs
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# Allows to override the parameters to buildRustCrate
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# for any rust dependency in the transitive build tree.
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#
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# Default: pkgs.defaultCrateOverrides
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#
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# Example:
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#
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# pkgs.defaultCrateOverrides // {
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# hello = attrs: { buildInputs = [ openssl ]; };
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# }
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, crateOverrides
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# Rust library dependencies, i.e. other libaries that were built
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# with buildRustCrate.
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, dependencies
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# Rust build dependencies, i.e. other libaries that were built
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# with buildRustCrate and are used by a build script.
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, buildDependencies
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# Specify the "extern" name of a library if it differs from the library target.
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# See above for an extended explanation.
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#
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# Default: no renames.
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#
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# Example:
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#
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# `crateRenames` supports two formats.
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#
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# The simple version is an attrset that maps the
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# `crateName`s of the dependencies to their alternative
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# names.
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#
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# ```nix
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# {
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# my_crate_name = "my_alternative_name";
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# # ...
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# }
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# ```
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#
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# The extended version is also keyed by the `crateName`s but allows
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# different names for different crate versions:
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#
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# ```nix
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# {
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# my_crate_name = [
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# { version = "1.2.3"; rename = "my_alternative_name01"; }
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# { version = "3.2.3"; rename = "my_alternative_name03"; }
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# ]
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# # ...
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# }
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# ```
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#
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# This roughly corresponds to the following snippet in Cargo.toml:
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#
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# ```toml
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# [dependencies]
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# my_alternative_name01 = { package = "my_crate_name", version = "0.1" }
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# my_alternative_name03 = { package = "my_crate_name", version = "0.3" }
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# ```
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#
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# Dependencies which use the lib target name as extern name, do not need
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# to be specified in the crateRenames, even if their crate name differs.
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#
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# Including multiple versions of a crate is very popular during
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# ecosystem transitions, e.g. from futures 0.1 to futures 0.3.
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, crateRenames
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# A list of extra options to pass to rustc.
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#
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# Example: [ "-Z debuginfo=2" ]
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# Default: []
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, extraRustcOpts
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# A list of extra options to pass to rustc when building a build.rs.
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#
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# Example: [ "-Z debuginfo=2" ]
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# Default: []
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, extraRustcOptsForBuildRs
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# Whether to enable building tests.
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# Use true to enable.
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# Default: false
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, buildTests
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# Passed to stdenv.mkDerivation.
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, preUnpack
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# Passed to stdenv.mkDerivation.
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, postUnpack
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# Passed to stdenv.mkDerivation.
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, prePatch
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# Passed to stdenv.mkDerivation.
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, patches
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# Passed to stdenv.mkDerivation.
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, postPatch
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# Passed to stdenv.mkDerivation.
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, preConfigure
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# Passed to stdenv.mkDerivation.
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, postConfigure
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# Passed to stdenv.mkDerivation.
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, preBuild
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# Passed to stdenv.mkDerivation.
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, postBuild
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# Passed to stdenv.mkDerivation.
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, preInstall
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# Passed to stdenv.mkDerivation.
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, postInstall
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}:
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let
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crate = crate_ // (lib.attrByPath [ crate_.crateName ] (attr: { }) crateOverrides crate_);
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dependencies_ = dependencies;
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buildDependencies_ = buildDependencies;
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processedAttrs = [
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"src"
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"nativeBuildInputs"
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"buildInputs"
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"crateBin"
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"crateLib"
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"libName"
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"libPath"
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"buildDependencies"
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"dependencies"
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"features"
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"crateRenames"
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"crateName"
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"version"
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"build"
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"authors"
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"colors"
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"edition"
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"buildTests"
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"codegenUnits"
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];
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extraDerivationAttrs = builtins.removeAttrs crate processedAttrs;
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nativeBuildInputs_ = nativeBuildInputs;
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buildInputs_ = buildInputs;
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extraRustcOpts_ = extraRustcOpts;
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extraRustcOptsForBuildRs_ = extraRustcOptsForBuildRs;
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buildTests_ = buildTests;
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# crate2nix has a hack for the old bash based build script that did split
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# entries at `,`. No we have to work around that hack.
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# https://github.com/kolloch/crate2nix/blame/5b19c1b14e1b0e5522c3e44e300d0b332dc939e7/crate2nix/templates/build.nix.tera#L89
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crateBin = lib.filter (bin: !(bin ? name && bin.name == ",")) (crate.crateBin or [ ]);
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hasCrateBin = crate ? crateBin;
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in
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stdenv.mkDerivation (rec {
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inherit (crate) crateName;
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inherit
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preUnpack
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postUnpack
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prePatch
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patches
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postPatch
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preConfigure
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postConfigure
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preBuild
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postBuild
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preInstall
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postInstall
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buildTests
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;
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src = crate.src or (fetchCrate { inherit (crate) crateName version sha256; });
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name = "rust_${crate.crateName}-${crate.version}${lib.optionalString buildTests_ "-test"}";
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version = crate.version;
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depsBuildBuild = [ pkgsBuildBuild.stdenv.cc ];
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nativeBuildInputs = [ rust stdenv.cc cargo jq ] ++ (crate.nativeBuildInputs or [ ]) ++ nativeBuildInputs_;
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buildInputs = lib.optionals stdenv.isDarwin [ libiconv ] ++ (crate.buildInputs or [ ]) ++ buildInputs_;
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dependencies = map lib.getLib dependencies_;
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buildDependencies = map lib.getLib buildDependencies_;
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completeDeps = lib.unique (dependencies ++ lib.concatMap (dep: dep.completeDeps) dependencies);
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completeBuildDeps = lib.unique (
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buildDependencies
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++ lib.concatMap (dep: dep.completeBuildDeps ++ dep.completeDeps) buildDependencies
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);
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# Create a list of features that are enabled by the crate itself and
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# through the features argument of buildRustCrate. Exclude features
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# with a forward slash, since they are passed through to dependencies,
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# and dep: features, since they're internal-only and do nothing except
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# enable optional dependencies.
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crateFeatures = lib.optionals (crate ? features)
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(builtins.filter
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(f: !(lib.hasInfix "/" f || lib.hasPrefix "dep:" f))
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(crate.features ++ features)
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);
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libName = if crate ? libName then crate.libName else crate.crateName;
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libPath = if crate ? libPath then crate.libPath else "";
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# Seed the symbol hashes with something unique every time.
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# https://doc.rust-lang.org/1.0.0/rustc/metadata/loader/index.html#frobbing-symbols
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metadata =
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let
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depsMetadata = lib.foldl' (str: dep: str + dep.metadata) "" (dependencies ++ buildDependencies);
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hashedMetadata = builtins.hashString "sha256"
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(crateName + "-" + crateVersion + "___" + toString (mkRustcFeatureArgs crateFeatures) +
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"___" + depsMetadata + "___" + rustAttrs.toRustTarget stdenv.hostPlatform);
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in
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lib.substring 0 10 hashedMetadata;
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build = crate.build or "";
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# Either set to a concrete sub path to the crate root
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# or use `null` for auto-detect.
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workspace_member = crate.workspace_member or ".";
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crateVersion = crate.version;
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crateDescription = crate.description or "";
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crateAuthors = if crate ? authors && lib.isList crate.authors then crate.authors else [ ];
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crateHomepage = crate.homepage or "";
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crateType =
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if lib.attrByPath [ "procMacro" ] false crate then [ "proc-macro" ] else
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if lib.attrByPath [ "plugin" ] false crate then [ "dylib" ] else
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(crate.type or [ "lib" ]);
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colors = lib.attrByPath [ "colors" ] "always" crate;
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extraLinkFlags = lib.concatStringsSep " " (crate.extraLinkFlags or [ ]);
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edition = crate.edition or null;
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codegenUnits = if crate ? codegenUnits then crate.codegenUnits else 1;
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extraRustcOpts =
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lib.optionals (crate ? extraRustcOpts) crate.extraRustcOpts
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++ extraRustcOpts_
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++ (lib.optional (edition != null) "--edition ${edition}");
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extraRustcOptsForBuildRs =
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lib.optionals (crate ? extraRustcOptsForBuildRs) crate.extraRustcOptsForBuildRs
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++ extraRustcOptsForBuildRs_
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++ (lib.optional (edition != null) "--edition ${edition}");
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configurePhase = configureCrate {
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inherit crateName buildDependencies completeDeps completeBuildDeps crateDescription
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crateFeatures crateRenames libName build workspace_member release libPath crateVersion
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extraLinkFlags extraRustcOptsForBuildRs
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crateAuthors crateHomepage verbose colors codegenUnits;
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};
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buildPhase = buildCrate {
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inherit crateName dependencies
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crateFeatures crateRenames libName release libPath crateType
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metadata hasCrateBin crateBin verbose colors
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extraRustcOpts buildTests codegenUnits;
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};
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installPhase = installCrate crateName metadata buildTests;
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# depending on the test setting we are either producing something with bins
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# and libs or just test binaries
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outputs = if buildTests then [ "out" ] else [ "out" "lib" ];
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outputDev = if buildTests then [ "out" ] else [ "lib" ];
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meta = {
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mainProgram = crateName;
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};
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} // extraDerivationAttrs
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)
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)
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{
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rust = rustc;
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release = crate_.release or true;
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verbose = crate_.verbose or true;
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extraRustcOpts = [ ];
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extraRustcOptsForBuildRs = [ ];
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features = [ ];
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nativeBuildInputs = [ ];
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buildInputs = [ ];
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crateOverrides = defaultCrateOverrides;
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preUnpack = crate_.preUnpack or "";
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postUnpack = crate_.postUnpack or "";
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prePatch = crate_.prePatch or "";
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patches = crate_.patches or [ ];
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postPatch = crate_.postPatch or "";
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preConfigure = crate_.preConfigure or "";
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postConfigure = crate_.postConfigure or "";
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preBuild = crate_.preBuild or "";
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postBuild = crate_.postBuild or "";
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preInstall = crate_.preInstall or "";
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postInstall = crate_.postInstall or "";
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dependencies = crate_.dependencies or [ ];
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buildDependencies = crate_.buildDependencies or [ ];
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crateRenames = crate_.crateRenames or { };
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buildTests = crate_.buildTests or false;
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}
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