755b915a15
nix run nixpkgs#silver-searcher -- -G '\.nix$' -0l 'description.*"[Aa]n?' pkgs \ | xargs -0 nix run nixpkgs#gnused -- -i '' -Ee 's/(description.*")[Aa]n? (.)/\1\U\2/'
123 lines
3.9 KiB
Nix
123 lines
3.9 KiB
Nix
{ lib, stdenv, bintools-unwrapped, llvmPackages, llvmPackages_13, coreutils }:
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let
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# aarch64-darwin needs a clang that can build arm64e binaries, so make sure a version of LLVM
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# is used that can do that, but prefer the stdenv one if it is new enough.
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llvmPkgs = if (lib.versionAtLeast (lib.getVersion llvmPackages.clang) "13")
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then llvmPackages
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else llvmPackages_13;
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in
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if stdenv.hostPlatform.isStatic
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then throw ''
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libredirect is not available on static builds.
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Please fix your derivation to not depend on libredirect on static
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builds, using something like following:
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nativeBuildInputs =
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lib.optional (!stdenv.buildPlatform.isStatic) libredirect;
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and disable tests as necessary, although fixing tests to work without
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libredirect is even better.
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libredirect uses LD_PRELOAD feature of dynamic loader and does not
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work on static builds where dynamic loader is not used.
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''
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else stdenv.mkDerivation rec {
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pname = "libredirect";
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version = "0";
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unpackPhase = ''
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cp ${./libredirect.c} libredirect.c
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cp ${./test.c} test.c
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'';
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outputs = ["out" "hook"];
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libName = "libredirect" + stdenv.hostPlatform.extensions.sharedLibrary;
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buildPhase = ''
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runHook preBuild
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${if stdenv.isDarwin && stdenv.isAarch64 then ''
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# We need the unwrapped binutils and clang:
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# We also want to build a fat library with x86_64, arm64, arm64e in there.
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# Because we use the unwrapped tools, we need to provide -isystem for headers
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# and the library search directory for libdl.
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# We can't build this on x86_64, because the libSystem we point to doesn't
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# like arm64(e).
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PATH=${bintools-unwrapped}/bin:${llvmPkgs.clang-unwrapped}/bin:$PATH \
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clang -arch x86_64 -arch arm64 -arch arm64e \
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-isystem ${llvmPkgs.clang.libc}/include \
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-isystem ${llvmPkgs.libclang.lib}/lib/clang/*/include \
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-L${llvmPkgs.clang.libc}/lib \
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-Wl,-install_name,$libName \
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-Wall -std=c99 -O3 -fPIC libredirect.c \
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-shared -o "$libName"
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'' else if stdenv.isDarwin then ''
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$CC -Wall -std=c99 -O3 -fPIC libredirect.c \
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-Wl,-install_name,$out/lib/$libName \
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-shared -o "$libName"
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'' else ''
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$CC -Wall -std=c99 -O3 -fPIC libredirect.c \
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-shared -o "$libName"
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''}
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if [ -n "$doInstallCheck" ]; then
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$CC -Wall -std=c99 \
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${lib.optionalString (!stdenv.isDarwin) "-D_GNU_SOURCE"} \
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-O3 test.c -o test
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fi
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runHook postBuild
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'';
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# We want to retain debugging info to be able to use GDB on libredirect.so
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# to more easily investigate which function overrides are missing or why
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# existing ones do not have the intended effect.
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dontStrip = true;
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installPhase = ''
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runHook preInstall
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install -vD "$libName" "$out/lib/$libName"
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'' + lib.optionalString (stdenv.isDarwin && stdenv.isAarch64) ''
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# dylib will be rejected unless dylib rpath gets explictly set
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install_name_tool \
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-change $libName $out/lib/$libName \
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$out/lib/$libName
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'' + ''
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# Provide a setup hook that injects our library into every process.
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mkdir -p "$hook/nix-support"
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cat <<SETUP_HOOK > "$hook/nix-support/setup-hook"
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${if stdenv.isDarwin then ''
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export DYLD_INSERT_LIBRARIES="$out/lib/$libName"
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'' else ''
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export LD_PRELOAD="$out/lib/$libName"
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''}
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SETUP_HOOK
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runHook postInstall
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'';
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doInstallCheck = true;
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installCheckPhase = ''
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(
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source "$hook/nix-support/setup-hook"
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NIX_REDIRECTS="/foo/bar/test=${coreutils}/bin/true:/bar/baz=$(mktemp -d)" ./test
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)
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'';
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meta = with lib; {
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platforms = platforms.unix;
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description = "LD_PRELOAD library to intercept and rewrite the paths in glibc calls";
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longDescription = ''
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libredirect is an LD_PRELOAD library to intercept and rewrite the paths in
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glibc calls based on the value of $NIX_REDIRECTS, a colon-separated list
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of path prefixes to be rewritten, e.g. "/src=/dst:/usr/=/nix/store/".
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'';
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};
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}
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