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> How do NixOS users typically manage software that is not a Nix package
By writing a Nix package for it (I don't mean for this to sound flippant, tone is a bit hard to convey over text).
For example I have this alpha quality rust binary that I'm developing but I also want a stable version installed at the OS level. I write a Nix package and simply compose it into my overall NixOS configuration alongside the more official Nixpkgs: https://github.com/rraval/nix/blob/master/git-nomad.nix
> like a source code tarball where you would traditionally run configure && make && make install?
Nix has a bunch of defaults that make a conventional package like this straightforward.
Here's a package for a vanilla C binary + library that does the `autoreconf && ./configure && make && make install` dance: https://github.com/NixOS/nixpkgs/blob/master/pkgs/tools/secu...
It's almost a little misleading because the actual steps are largely inherited from the defaults, you can read more about `stdenv.mkDerivation` here: https://nixos.org/guides/nix-pills/fundamentals-of-stdenv.ht...
> How do NixOS users typically manage software that is not a Nix package
By writing a Nix package for it (I don't mean for this to sound flippant, tone is a bit hard to convey over text).
For example I have this alpha quality rust binary that I'm developing but I also want a stable version installed at the OS level. I write a Nix package and simply compose it into my overall NixOS configuration alongside the more official Nixpkgs: https://github.com/rraval/nix/blob/master/git-nomad.nix
> like a source code tarball where you would traditionally run configure && make && make install?
Nix has a bunch of defaults that make a conventional package like this straightforward.
Here's a package for a vanilla C binary + library that does the `autoreconf && ./configure && make && make install` dance: https://github.com/NixOS/nixpkgs/blob/master/pkgs/tools/secu...
It's almost a little misleading because the actual steps are largely inherited from the defaults, you can read more about `stdenv.mkDerivation` here: https://nixos.org/guides/nix-pills/fundamentals-of-stdenv.ht...
3) You can cheat in various ways if your project truly requires being updated by only changing the glibc and no recompilation is feasible. Some options: the way OpenGL and graphics is currently done in NixOS, nix-rewrite (https://github.com/timjrd/nixrewrite), and LD_PRELOAD. Breaking the abstraction in this way may have practical benefits, but you also lose the reproducibility and excellent bookkeeping of all the details that Nix provides.
4) specify a container/project/VM that uses your patched glibc, so only those things are rebuilt that matter in your use-case.
The crux of the matter is that we need to be more precise in the names of things. Most of the time "glibc" refers to whatever is on your system on the same path. Nix has taken the other extreme where you can't just say "glibc", you really mean "this particular source, compiled with this particular set of flags and build script". If you want something more powerful\and between those extremes, there is some work currently on a system called Nomia that attempts to provide a far richer naming semantics, but it is still experimental. https://github.com/scarf-sh/nomia It would allow something like "glibc means anything ABI compatible with this particular thing, plus some other requirements...."