38377ab026
macOS's dyld can be rather picky as to what dylib it accepts. This even changes across macOS versions. Therefore we now build a fat dylib with all three architectures (x86_64, arm64, arm64e). This should then be compatible with pretty much any macOS's dyld.
91 lines
2.8 KiB
Nix
91 lines
2.8 KiB
Nix
{ lib, stdenv, bintools-unwrapped, llvmPackages_13, coreutils }:
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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 ${./test.c} test.c
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'';
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outputs = ["out" "hook"];
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libName = "libredirect" + stdenv.targetPlatform.extensions.sharedLibrary;
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buildPhase = ''
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runHook preBuild
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${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=${bintools-unwrapped}/bin:${llvmPackages_13.clang-unwrapped}/bin:$PATH \
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clang -arch x86_64 -arch arm64 -arch arm64e \
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-isystem ${llvmPackages_13.clang.libc}/include \
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-isystem ${llvmPackages_13.libclang.lib}/lib/clang/*/include \
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-L${llvmPackages_13.clang.libc}/lib \
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-Wl,-install_name,$out/lib/$libName \
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-Wall -std=c99 -O3 -fPIC libredirect.c \
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-ldl -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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-ldl -shared -o "$libName"
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'' else ''
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$CC -Wall -std=c99 -O3 -fPIC libredirect.c \
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-ldl -shared -o "$libName"
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''}
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if [ -n "$doInstallCheck" ]; then
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$CC -Wall -std=c99 -O3 test.c -o test
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fi
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runHook postBuild
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'';
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# We want to retain debugging info to be able to use GDB on libredirect.so
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# to more easily investigate which function overrides are missing or why
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# existing ones do not have the intended effect.
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dontStrip = true;
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installPhase = ''
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runHook preInstall
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install -vD "$libName" "$out/lib/$libName"
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# 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" ./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 = "An 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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