Re: compat_linux failures due to execve, openat, etc.

[RVP <rvp%SDF.ORG@localhost>]

On Fri, 31 Oct 2025, Robert Swindells wrote:

> > I'm nix will just symlink in $HOME/.nix-profile/bin to the
> > /nix/store/ hashed version of /bin. In other words, if you had a
> > program called foo you'd have:
> > $ ls -l $HOME/.nix-profile/bin
> > $HOME/.nix-profile/bin/foo -> /nix/store/hash-foo-1.2.3/bin/foo
>
> You still haven't answered whether the strings listed in each NAMI line
> of the ktrace(1) output match real files on your machine or not.

I think ktnb@ has just replaced those long hash values with ${hash1} & ${hash2}.
On NixOS, it actually is:

```
[rvp@nixos:~]$ ldd $(which vim)
        linux-vdso.so.1 (0x00007f9e38c71000)
        libm.so.6 => /nix/store/g8zyryr9cr6540xsyg4avqkwgxpnwj2a-glibc-2.40-66/lib/libm.so.6 (0x00007f9e38b82000)
        libncursesw.so.6 => /nix/store/yw7vb4hamv9mqgbgf7598zvis7k2spyx-ncurses-6.5/lib/libncursesw.so.6 (0x00007f9e38b08000)
        libc.so.6 => /nix/store/g8zyryr9cr6540xsyg4avqkwgxpnwj2a-glibc-2.40-66/lib/libc.so.6 (0x00007f9e38800000)
        /nix/store/g8zyryr9cr6540xsyg4avqkwgxpnwj2a-glibc-2.40-66/lib/ld-linux-x86-64.so.2 => /nix/store/g8zyryr9cr6540xsyg4avqkwgxpnwj2a-glibc-2.40-66/lib64/ld-linux-x86-64.so.2 (0x00007f9e38c73000)

[rvp@nixos:~]$ 
```

(If it was a literal ${hash1} etc. there, then the kernel would've returned
ENOENT much earlier.)

On NixOS, binaries and libraries are stored in dirs. based on the hashes of
all the dependencies they were built with, I think. This lets multiple binaries
and libraries versions co-exist on the same system w/o any issues:

https://nixos.org/guides/how-nix-works/

-RVP