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add buildRustCrate function to build rust crates

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Pierre-Étienne Meunier 2017-12-12 04:55:15 -06:00 committed by Jörg Thalheim
parent ea232fe29d
commit 5a0d954156
4 changed files with 558 additions and 1 deletions
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163
doc/languages-frameworks/rust.md
View File

@ -20,7 +20,7 @@ For daily builds (beta and nightly) use either rustup from
nixpkgs or use the [Rust nightlies
overlay](#using-the-rust-nightlies-overlay).
## Packaging Rust applications
## Compiling Rust applications with Cargo
Rust applications are packaged by using the `buildRustPackage` helper from `rustPlatform`:
@ -56,6 +56,167 @@ checksum can be then take from the failed build.
To install crates with nix there is also an experimental project called
[nixcrates](https://github.com/fractalide/nixcrates).
## Compiling Rust crates using Nix instead of Cargo
When run, `cargo build` produces a file called `Cargo.lock`,
containing pinned versions of all dependencies. Nixpkgs contains a
tool called `carnix` (`nix-env -iA nixos.carnix`), which can be used
to turn a `Cargo.lock` into a Nix expression.
That Nix expression calls `rustc` directly (hence bypassing Cargo),
and can be used to compile a crate and all its dependencies. Here is
an example for a minimal `hello` crate:
$ cargo new hello
$ cd hello
$ cargo build
Compiling hello v0.1.0 (file:///tmp/hello)
Finished dev [unoptimized + debuginfo] target(s) in 0.20 secs
$ carnix -o hello.nix --src ./. Cargo.lock --standalone
$ nix-build hello.nix
Now, the file produced by the call to `carnix`, called `hello.nix`, looks like:
```
with import <nixpkgs> {};
let kernel = buildPlatform.parsed.kernel.name;
# ... (content skipped)
hello_0_1_0_ = { dependencies?[], buildDependencies?[], features?[] }: buildRustCrate {
crateName = "hello";
version = "0.1.0";
authors = [ "Authorname <user@example.com>" ];
src = ./.;
inherit dependencies buildDependencies features;
};
in
rec {
hello_0_1_0 = hello_0_1_0_ rec {};
}
```
In particular, note that the argument given as `--src` is copied
verbatim to the source. If we look at a more complicated
dependencies, for instance by adding a single line `libc="*"` to our
`Cargo.toml`, we first need to run `cargo build` to update the
`Cargo.lock`. Then, `carnix` needs to be run again, and produces the
following nix file:
```
with import <nixpkgs> {};
let kernel = buildPlatform.parsed.kernel.name;
# ... (content skipped)
hello_0_1_0_ = { dependencies?[], buildDependencies?[], features?[] }: buildRustCrate {
crateName = "hello";
version = "0.1.0";
authors = [ "Jörg Thalheim <joerg@thalheim.io>" ];
src = ./.;
inherit dependencies buildDependencies features;
};
libc_0_2_34_ = { dependencies?[], buildDependencies?[], features?[] }: buildRustCrate {
crateName = "libc";
version = "0.2.34";
authors = [ "The Rust Project Developers" ];
sha256 = "11jmqdxmv0ka10ay0l8nzx0nl7s2lc3dbrnh1mgbr2grzwdyxi2s";
inherit dependencies buildDependencies features;
};
in
rec {
hello_0_1_0 = hello_0_1_0_ rec {
dependencies = [ libc_0_2_34 ];
};
libc_0_2_34_features."default".from_hello_0_1_0__default = true;
libc_0_2_34 = libc_0_2_34_ rec {
features = mkFeatures libc_0_2_34_features;
};
libc_0_2_34_features."use_std".self_default = hasDefault libc_0_2_34_features;
}
```
Here, the `libc` crate has no `src` attribute, so `buildRustCrate`
will fetch it from [crates.io](https://crates.io). A `sha256`
attribute is still needed for Nix purity.
Some crates require external libraries. For crates from
[crates.io](https://crates.io), such libraries can be specified in
`defaultCrateOverrides` package in nixpkgs itself.
Starting from that file, one can add more overrides, to add features
or build inputs by overriding the hello crate in a seperate file.
```
with import <nixpkgs> {};
(import ./hello.nix).hello_0_1_0.override {
crateOverrides = defaultCrateOverrides // {
hello = attrs: { buildInputs = [ openssl ]; };
};
}
```
Here, `crateOverrides` is expected to be a attribute set, where the
key is the crate name without version number and the value a function.
The function gets all attributes passed to `buildRustCrate` as first
argument and returns a set that contains all attribute that should be
overwritten.
For more complicated cases, such as when parts of the crate's
derivation depend on the the crate's version, the `attrs` argument of
the override above can be read, as in the following example, which
patches the derivation:
```
with import <nixpkgs> {};
(import ./hello.nix).hello_0_1_0.override {
crateOverrides = defaultCrateOverrides // {
hello = attrs: lib.optionalAttrs (lib.versionAtLeast attrs.version "1.0") {
postPatch = ''
substituteInPlace lib/zoneinfo.rs \
--replace "/usr/share/zoneinfo" "${tzdata}/share/zoneinfo"
'';
};
};
}
```
Another situation is when we want to override a nested
dependency. This actually works in the exact same way, since the
`crateOverrides` parameter is forwarded to the crate's
dependencies. For instance, to override the build inputs for crate
`libc` in the example above, where `libc` is a dependency of the main
crate, we could do:
```
with import <nixpkgs> {};
(import hello.nix).hello_0_1_0.override {
crateOverrides = defaultCrateOverrides // {
libc = attrs: { buildInputs = []; };
};
}
```
Three more parameters can be overridden:
- The version of rustc used to compile the crate:
```
hello_0_1_0.override { rust = pkgs.rust; };
```
- Whether to build in release mode or debug mode (release mode by
default):
```
hello_0_1_0.override { release = false; };
```
- Whether to print the commands sent to rustc when building
(equivalent to `--verbose` in cargo:
```
hello_0_1_0.override { verbose = false; };
```
## Using the Rust nightlies overlay
Mozilla provides an overlay for nixpkgs to bring a nightly version of Rust into scope.

382
pkgs/build-support/rust/build-rust-crate.nix Normal file
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@ -0,0 +1,382 @@
# Code for buildRustCrate, a Nix function that builds Rust code, just
# like Cargo, but using Nix instead.
#
# This can be useful for deploying packages with NixOps, and to share
# binary dependencies between projects.
{ lib, buildPlatform, stdenv, defaultCrateOverrides, fetchCrate, ncurses, rustc }:
let buildCrate = { crateName, crateVersion, crateAuthors, buildDependencies,
dependencies, completeDeps, completeBuildDeps,
crateFeatures, libName, build, release, libPath,
crateType, metadata, crateBin, finalBins,
verbose, colors }:
let depsDir = lib.concatStringsSep " " dependencies;
completeDepsDir = lib.concatStringsSep " " completeDeps;
completeBuildDepsDir = lib.concatStringsSep " " completeBuildDeps;
makeDeps = dependencies:
(lib.concatMapStringsSep " " (dep:
let extern = lib.strings.replaceStrings ["-"] ["_"] dep.libName; in
(if dep.crateType == "lib" then
" --extern ${extern}=${dep.out}/lib/lib${extern}-${dep.metadata}.rlib"
else
" --extern ${extern}=${dep.out}/lib/lib${extern}-${dep.metadata}${buildPlatform.extensions.sharedLibrary}")
) dependencies);
deps = makeDeps dependencies;
buildDeps = makeDeps buildDependencies;
optLevel = if release then 3 else 0;
rustcOpts = (if release then "-C opt-level=3" else "-C debuginfo=2");
rustcMeta = "-C metadata=${metadata} -C extra-filename=-${metadata}";
version_ = lib.splitString "-" crateVersion;
versionPre = if lib.tail version_ == [] then "" else builtins.elemAt version_ 1;
version = lib.splitString "." (lib.head version_);
authors = lib.concatStringsSep ":" crateAuthors;
in ''
norm=""
bold=""
green=""
boldgreen=""
if [[ "${colors}" -eq "always" ]]; then
norm="$(printf '\033[0m')" #returns to "normal"
bold="$(printf '\033[0;1m')" #set bold
green="$(printf '\033[0;32m')" #set green
boldgreen="$(printf '\033[0;1;32m')" #set bold, and set green.
fi
echo_build_heading() {
start=""
end=""
if [[ x"${colors}" -eq x"always" ]]; then
start="$(printf '\033[0;1;32m')" #set bold, and set green.
end="$(printf '\033[0m')" #returns to "normal"
fi
if (( $# == 1 )); then
echo "$start""Building $1""$end"
else
echo "$start""Building $1 ($2)""$end"
fi
}
noisily() {
start=""
end=""
if [[ x"${colors}" -eq x"always" ]]; then
start="$(printf '\033[0;1;32m')" #set bold, and set green.
end="$(printf '\033[0m')" #returns to "normal"
fi
${lib.optionalString verbose ''
echo -n "$start"Running "$end"
echo $@
''}
$@
}
symlink_dependency() {
# $1 is the nix-store path of a dependency
i=$1
dest=target/deps
if [ ! -z $2 ]; then
if [ "$2" = "--buildDep" ]; then
dest=target/buildDeps
fi
fi
ln -s -f $i/lib/*.rlib $dest #*/
ln -s -f $i/lib/*.so $i/lib/*.dylib $dest #*/
if [ -e "$i/lib/link" ]; then
cat $i/lib/link >> target/link
cat $i/lib/link >> target/link.final
fi
if [ -e $i/env ]; then
source $i/env
fi
}
build_lib() {
lib_src=$1
echo_build_heading $lib_src ${libName}
noisily rustc --crate-name $CRATE_NAME $lib_src --crate-type ${crateType} \
${rustcOpts} ${rustcMeta} ${crateFeatures} --out-dir target/lib \
--emit=dep-info,link -L dependency=target/deps ${deps} --cap-lints allow \
$BUILD_OUT_DIR $EXTRA_BUILD $EXTRA_FEATURES --color ${colors}
EXTRA_LIB=" --extern $CRATE_NAME=target/lib/lib$CRATE_NAME-${metadata}.rlib"
if [ -e target/deps/lib$CRATE_NAME-${metadata}${buildPlatform.extensions.sharedLibrary} ]; then
EXTRA_LIB="$EXTRA_LIB --extern $CRATE_NAME=target/lib/lib$CRATE_NAME-${metadata}${buildPlatform.extensions.sharedLibrary}"
fi
}
build_bin() {
crate_name=$1
crate_name_=$(echo $crate_name | sed -e "s/-/_/g")
main_file=""
if [[ ! -z $2 ]]; then
main_file=$2
fi
echo_build_heading $@
noisily rustc --crate-name $crate_name_ $main_file --crate-type bin ${rustcOpts}\
${crateFeatures} --out-dir target/bin --emit=dep-info,link -L dependency=target/deps \
$LINK ${deps}$EXTRA_LIB --cap-lints allow \
$BUILD_OUT_DIR $EXTRA_BUILD $EXTRA_FEATURES --color ${colors}
if [ "$crate_name_" -ne "$crate_name" ]; then
mv target/bin/$crate_name_ target/bin/$crate_name
fi
}
runHook preBuild
mkdir -p target/{deps,lib,build,buildDeps}
chmod uga+w target -R
for i in ${completeDepsDir}; do
symlink_dependency $i
done
for i in ${completeBuildDepsDir}; do
symlink_dependency $i --buildDep
done
if [ -e target/link ]; then
sort -u target/link > target/link.sorted
mv target/link.sorted target/link
sort -u target/link.final > target/link.final.sorted
mv target/link.final.sorted target/link.final
tr '\n' ' ' < target/link > target/link_
fi
EXTRA_BUILD=""
BUILD_OUT_DIR=""
export CARGO_PKG_NAME=${crateName}
export CARGO_PKG_VERSION=${crateVersion}
export CARGO_PKG_AUTHORS="${authors}"
export CARGO_CFG_TARGET_ARCH=${buildPlatform.parsed.cpu.name}
export CARGO_CFG_TARGET_OS=${buildPlatform.parsed.kernel.name}
export CARGO_CFG_TARGET_ENV="gnu"
export CARGO_MANIFEST_DIR="."
export DEBUG="${toString (!release)}"
export OPT_LEVEL="${toString optLevel}"
export TARGET="${buildPlatform.config}"
export HOST="${buildPlatform.config}"
export PROFILE=${if release then "release" else "debug"}
export OUT_DIR=$(pwd)/target/build/${crateName}.out
export CARGO_PKG_VERSION_MAJOR=${builtins.elemAt version 0}
export CARGO_PKG_VERSION_MINOR=${builtins.elemAt version 1}
export CARGO_PKG_VERSION_PATCH=${builtins.elemAt version 2}
if [ -n "${versionPre}" ]; then
export CARGO_PKG_VERSION_PRE="${versionPre}"
fi
BUILD=""
if [[ ! -z "${build}" ]] ; then
BUILD=${build}
elif [[ -e "build.rs" ]]; then
BUILD="build.rs"
fi
if [[ ! -z "$BUILD" ]] ; then
echo_build_heading "$BUILD" ${libName}
mkdir -p target/build/${crateName}
EXTRA_BUILD_FLAGS=""
if [ -e target/link_ ]; then
EXTRA_BUILD_FLAGS=$(cat target/link_)
fi
if [ -e target/link.build ]; then
EXTRA_BUILD_FLAGS="$EXTRA_BUILD_FLAGS $(cat target/link.build)"
fi
noisily rustc --crate-name build_script_build $BUILD --crate-type bin ${rustcOpts} \
${crateFeatures} --out-dir target/build/${crateName} --emit=dep-info,link \
-L dependency=target/buildDeps ${buildDeps} --cap-lints allow $EXTRA_BUILD_FLAGS --color ${colors}
mkdir -p target/build/${crateName}.out
export RUST_BACKTRACE=1
BUILD_OUT_DIR="-L $OUT_DIR"
mkdir -p $OUT_DIR
target/build/${crateName}/build_script_build > target/build/${crateName}.opt
set +e
EXTRA_BUILD=$(sed -n "s/^cargo:rustc-flags=\(.*\)/\1/p" target/build/${crateName}.opt | tr '\n' ' ')
EXTRA_FEATURES=$(sed -n "s/^cargo:rustc-cfg=\(.*\)/--cfg \1/p" target/build/${crateName}.opt | tr '\n' ' ')
EXTRA_LINK=$(sed -n "s/^cargo:rustc-link-lib=\(.*\)/\1/p" target/build/${crateName}.opt | tr '\n' ' ')
EXTRA_LINK_SEARCH=$(sed -n "s/^cargo:rustc-link-search=\(.*\)/\1/p" target/build/${crateName}.opt | tr '\n' ' ')
CRATENAME=$(echo ${crateName} | sed -e "s/\(.*\)-sys$/\U\1/")
grep -P "^cargo:(?!(rustc-|warning=|rerun-if-changed=|rerun-if-env-changed))" target/build/${crateName}.opt \
| sed -e "s/cargo:\([^=]*\)=\(.*\)/export DEP_$(echo $CRATENAME)_\U\1\E=\2/" > target/env
set -e
if [ -n "$(ls target/build/${crateName}.out)" ]; then
if [ -e "${libPath}" ] ; then
cp -r target/build/${crateName}.out/* $(dirname ${libPath}) #*/
else
cp -r target/build/${crateName}.out/* src #*/
fi
fi
fi
EXTRA_LIB=""
CRATE_NAME=$(echo ${libName} | sed -e "s/-/_/g")
if [ -e target/link_ ]; then
EXTRA_BUILD="$(cat target/link_) $EXTRA_BUILD"
fi
if [ -e "${libPath}" ] ; then
build_lib ${libPath}
elif [ -e src/lib.rs ] ; then
build_lib src/lib.rs
elif [ -e src/${libName}.rs ] ; then
build_lib src/${libName}.rs
fi
echo "$EXTRA_LINK_SEARCH" | while read i; do
if [ ! -z "$i" ]; then
for lib in $i; do
echo "-L $lib" >> target/link
L=$(echo $lib | sed -e "s#$(pwd)/target/build#$out/lib#")
echo "-L $L" >> target/link.final
done
fi
done
echo "$EXTRA_LINK" | while read i; do
if [ ! -z "$i" ]; then
for lib in $i; do
echo "-l $lib" >> target/link
echo "-l $lib" >> target/link.final
done
fi
done
if [ -e target/link ]; then
sort -u target/link.final > target/link.final.sorted
mv target/link.final.sorted target/link.final
sort -u target/link > target/link.sorted
mv target/link.sorted target/link
tr '\n' ' ' < target/link > target/link_
LINK=$(cat target/link_)
fi
mkdir -p target/bin
echo "${crateBin}" | sed -n 1'p' | tr ',' '\n' | while read BIN; do
if [ ! -z "$BIN" ]; then
build_bin $BIN
fi
done
${lib.optionalString (crateBin == "") ''
if [[ -e src/main.rs ]]; then
build_bin ${crateName} src/main.rs
fi
for i in src/bin/*.rs; do #*/
build_bin "$(basename $i .rs)" "$i"
done
''}
# Remove object files to avoid "wrong ELF type"
find target -type f -name "*.o" -print0 | xargs -0 rm -f
runHook postBuild
'' + finalBins;
installCrate = crateName: ''
mkdir -p $out
if [ -s target/env ]; then
cp target/env $out/env
fi
if [ -s target/link.final ]; then
mkdir -p $out/lib
cp target/link.final $out/lib/link
fi
if [ "$(ls -A target/lib)" ]; then
mkdir -p $out/lib
cp target/lib/* $out/lib #*/
fi
if [ "$(ls -A target/build)" ]; then # */
mkdir -p $out/lib
cp -r target/build/* $out/lib # */
fi
if [ "$(ls -A target/bin)" ]; then
mkdir -p $out/bin
cp -P target/bin/* $out/bin # */
fi
'';
in
crate_: lib.makeOverridable ({ rust, release, verbose, features, buildInputs, crateOverrides }:
let crate = crate_ // (lib.attrByPath [ crate_.crateName ] (attr: {}) crateOverrides crate_);
buildInputs_ = buildInputs;
in
stdenv.mkDerivation rec {
inherit (crate) crateName;
src = if lib.hasAttr "src" crate then
crate.src
else
fetchCrate { inherit (crate) crateName version sha256; };
name = "rust_${crate.crateName}-${crate.version}";
buildInputs = [ rust ncurses ] ++ (crate.buildInputs or []) ++ buildInputs_;
dependencies =
builtins.map
(dep: dep.override { rust = rust; release = release; verbose = verbose; crateOverrides = crateOverrides; })
(crate.dependencies or []);
buildDependencies =
builtins.map
(dep: dep.override { rust = rust; release = release; verbose = verbose; crateOverrides = crateOverrides; })
(crate.buildDependencies or []);
completeDeps = lib.lists.unique (dependencies ++ lib.lists.concatMap (dep: dep.completeDeps) dependencies);
completeBuildDeps = lib.lists.unique (
buildDependencies
++ lib.lists.concatMap (dep: dep.completeBuildDeps ++ dep.completeDeps) buildDependencies
);
crateFeatures = if crate ? features then
lib.concatMapStringsSep " " (f: "--cfg feature=\\\"${f}\\\"") (crate.features ++ features)
else "";
libName = if crate ? libName then crate.libName else crate.crateName;
libPath = if crate ? libPath then crate.libPath else "";
metadata = builtins.substring 0 10 (builtins.hashString "sha256" (crateName + "-" + crateVersion));
crateBin = if crate ? crateBin then
builtins.foldl' (bins: bin:
let name =
lib.strings.replaceStrings ["-"] ["_"]
(if bin ? name then bin.name else crateName);
path = if bin ? path then bin.path else "src/main.rs";
in
bins + (if bin == "" then "" else ",") + "${name} ${path}"
) "" crate.crateBin
else "";
finalBins = if crate ? crateBin then
builtins.foldl' (bins: bin:
let name = lib.strings.replaceStrings ["-"] ["_"]
(if bin ? name then bin.name else crateName);
new_name = if bin ? name then bin.name else crateName;
in
if name == new_name then bins else
(bins + "mv target/bin/${name} target/bin/${new_name};")
) "" crate.crateBin
else "";
build = if crate ? build then crate.build else "";
crateVersion = crate.version;
crateAuthors = if crate ? authors && lib.isList crate.authors then crate.authors else [];
crateType =
if lib.attrByPath ["procMacro"] false crate then "proc-macro" else
if lib.attrByPath ["plugin"] false crate then "dylib" else "lib";
colors = lib.attrByPath [ "colors" ] "always" crate;
buildPhase = buildCrate {
inherit crateName dependencies buildDependencies completeDeps completeBuildDeps
crateFeatures libName build release libPath crateType crateVersion
crateAuthors metadata crateBin finalBins verbose colors;
};
installPhase = installCrate crateName;
}) {
rust = rustc;
release = true;
verbose = true;
features = [];
buildInputs = [];
crateOverrides = defaultCrateOverrides;
}

10
pkgs/build-support/rust/default-crate-overrides.nix Normal file
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@ -0,0 +1,10 @@
{ pkgconfig, sqlite, openssl, ... }:
{
libsqlite3-sys = attrs: {
buildInputs = [ pkgconfig sqlite ];
};
openssl-sys = attrs: {
buildInputs = [ pkgconfig openssl ];
};
}

4
pkgs/top-level/all-packages.nix
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@ -6307,6 +6307,10 @@ with pkgs;
rust = callPackage ../development/compilers/rust { };
inherit (rust) cargo rustc;
buildRustCrate = callPackage ../build-support/rust/build-rust-crate.nix { };
defaultCrateOverrides = callPackage ../build-support/rust/default-crate-overrides.nix { };
rustPlatform = recurseIntoAttrs (makeRustPlatform rust);
makeRustPlatform = rust: lib.fix (self: