nixpkgs/pkgs/build-support/libredirect/default.nix
zimbatm 91c130e2f5
libredirect: introduce optional setup-hook
This allows to simplify the usage of libredirect inside of nix build
sandboxes. Add "libredirect.hook" to the build inputs to get everything
linked in automaticall. All that's left is to set NIX_REDIRECTS and call
the target program.
2018-11-14 00:05:23 +01:00

57 lines
1.4 KiB
Nix

{ stdenv, coreutils }:
stdenv.mkDerivation {
name = "libredirect-0";
unpackPhase = ''
cp ${./libredirect.c} libredirect.c
cp ${./test.c} test.c
'';
libName = "libredirect" + stdenv.targetPlatform.extensions.sharedLibrary;
outputs = ["out" "hook"];
buildPhase = ''
$CC -Wall -std=c99 -O3 -shared libredirect.c \
-o "$libName" -fPIC -ldl
if [ -n "$doInstallCheck" ]; then
$CC -Wall -std=c99 -O3 test.c -o test
fi
'';
installPhase = ''
install -vD "$libName" "$out/lib/$libName"
mkdir -p "$hook/nix-support"
cat <<SETUP_HOOK > "$hook/nix-support/setup-hook"
${if stdenv.isDarwin then ''
export DYLD_INSERT_LIBRARIES="$out/lib/$libName"
export DYLD_FORCE_FLAT_NAMESPACE=1
'' else ''
export LD_PRELOAD="$out/lib/$libName"
''}
SETUP_HOOK
'';
doInstallCheck = true;
installCheckPhase = ''
(
source "$hook/nix-support/setup-hook"
NIX_REDIRECTS="/foo/bar/test=${coreutils}/bin/true" ./test
)
'';
meta = {
platforms = stdenv.lib.platforms.unix;
description = "An LD_PRELOAD library to intercept and rewrite the paths in glibc calls";
longDescription = ''
libredirect is an LD_PRELOAD library to intercept and rewrite the paths in
glibc calls based on the value of $NIX_REDIRECTS, a colon-separated list
of path prefixes to be rewritten, e.g. "/src=/dst:/usr/=/nix/store/".
'';
};
}