Can nix-ld be used in docker image created with nix2container?

[nxy7]

Hi, I'm trying to create minimal docker image, that can run binaries. I've created repo @ https://github.com/nxy7/tiny and published this image to docker hub (in case anyone wants to test it) as nxyt/tiny:latest. Anyway - it doesn't work and any binary I run results in bash: ./main: cannot execute: required file not found.
As far as I understand binaries expect linker at specific location, so even if ldd my-binary shows that all dependencies are present it still tries to call linker at /lib64/xxx and because there's none, that's why my binaries are failing.

If I got that right, that's the problem that nix-ld is trying to solve, but I cannot really get that to work with nix2container.
What I've tried was adding nix_ld to copyToRoot and adding 'lib' and 'lib64' to 'pathsToLink' and I've also added NIX_LD env variable, but that still doesn't work.

Can nix-ld be used to fix that error, or is it made only for NixOS? Any guidance toward getting that to work would be great :-)

[Mic92]

Should work for containers as well - also you could probably just copy the real thing in if it's just scoped for smaller well scoped projects -> the actual glibc ld.so and set LIBRARY_PATH directly. Using that in copyToRoot might work (untested)?

    nix-ld = let
         libDir = if builtins.elem stdenv.system [ "x86_64-linux" "mips64-linux" "powerpc64le-linux" ]
           then "/lib64"
           else "/lib";

    in pkgs.runCommand "nix-ld" {} ''
      install -D -m755 ${pkgs.nix-ld}/libexec/nix-ld ${libDir}/$(basename ${pkgs.stdenv.cc.bintools.dynamicLinker})
    '';

I am not sure if copyToRoot works well with symlinks, so I used install again which always should work.
Make sure you have a valid file afterwards in /lib64 and that your NIX_LD_LIBRARY_PATH is set for real. Otherwise @nlewo is a better person to ask about nix2container details