Best way to define common FHS environment?

Help
1

I have the following definition in my systemPackages, which gives me an fhs binary which drops me into a shell which looks like a normal Linux:

  environment.systemPackages = with pkgs; [
    (pkgs.buildFHSUserEnv {
      name = "fhs";
      targetPkgs = pkgs: with pkgs; [
        alsa-lib atk cairo cups curl dbus expat file fish fontconfig freetype
        fuse glib gtk3 libGL libnotify libxml2 libxslt netcat nspr nss openjdk8
        openssl.dev pango pkg-config strace udev vulkan-loader watch wget which
        xorg.libX11 xorg.libxcb xorg.libXcomposite xorg.libXcursor
        xorg.libXdamage xorg.libXext xorg.libXfixes xorg.libXi xorg.libXrandr
        xorg.libXrender xorg.libXScrnSaver xorg.libxshmfence xorg.libXtst
        xorg.xcbutilkeysyms zlib fontconfig.lib
      ];
      profile = ''export FHS=1'';
      runScript = "fish";
    })
    # all of my other packages
  ];

$ ls /usr/lib
"/usr/lib": No such file or directory (os error 2)

$ fhs

(fhs) $ ls /usr/lib | head -n 5
dr-xr-xr-x   - nobody  1 Jan  1970 32
dr-xr-xr-x   - nobody  1 Jan  1970 audit
dr-xr-xr-x   - nobody  1 Jan  1970 bash
dr-xr-xr-x   - nobody  1 Jan  1970 cairo
lrwxrwxrwx  69 nobody  1 Jan  1970 crt1.o -> /nix/store/aji28kaprqnrkapmfyjnnnv3ffvlaq0a-fhs-usr-target/lib/crt1.o
(fhs) $ # I can now run various unpatched vanilla binaries here

It works great, except that there’s this frightening block of standard packages which I partially copied from somewhere, and partially append a bunch of random stuff myself.

Is there some maintained-by-someone-else package I can re-use here? I am essentially looking for buildFHSUserEnv specialized to a set of “standard” packages (whatever that set is at the current moment in time).

2 Likes
2

I’m not aware of any standard set of packages, but something like this can include most of what you want

builtins.concatMap (p: p.buildInputs) config.environment.systemPackages
1 Like
3

I’m not super familiar with it, but I think there are various lists of packages for use with buildfhsuserenvs in nixpkgs.

For instance:

Used here for example (I think):

2 Likes
4

Thanks, this is exactly what I was looking for!

1 Like
5

I wanted to share this little script:

nix shell --impure --expr '(builtins.getFlake "nixpkgs-current").legacyPackages.${builtins.currentSystem}.buildFHSUserEnv { name = "fhs"; targetPkgs = p: with p; ['"$*"' ]; }' --command fhs

Arguments accepted are simply packages. This can also be improved to include support for additional arguments to the shell itself etc…

1 Like