From b7b913b444795a29a19b2efd7543c10e28fc07c5 Mon Sep 17 00:00:00 2001
From: Ryan Yin <xiaoyin_c@qq.com>
Date: Thu, 25 Jul 2024 23:25:33 +0800
Subject: [PATCH] feat: add nix-ld and LIBRARY_PATH for mason.nvim and other
 downloaded binaries

---
 home/base/tui/editors/neovim/default.nix | 21 +++++++++++++++++++
 modules/nixos/desktop/fhs.nix            | 26 ++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/home/base/tui/editors/neovim/default.nix b/home/base/tui/editors/neovim/default.nix
index 9d261db0..cb0cea01 100644
--- a/home/base/tui/editors/neovim/default.nix
+++ b/home/base/tui/editors/neovim/default.nix
@@ -30,6 +30,27 @@ in {
       viAlias = true;
       vimAlias = true;
 
+      # These environment variables are needed to build and run binaries
+      # with external package managers like mason.nvim.
+      #
+      # LD_LIBRARY_PATH is also needed to run the non-FHS binaries downloaded by mason.nvim.
+      # it will be set by nix-ld, so we do not need to set it here again.
+      extraWrapperArgs = with pkgs; [
+        # LIBRARY_PATH is used by gcc before compilation to search directories
+        # containing static and shared libraries that need to be linked to your program.
+        "--suffix"
+        "LIBRARY_PATH"
+        ":"
+        "${lib.makeLibraryPath [stdenv.cc.cc zlib]}"
+
+        # PKG_CONFIG_PATH is used by pkg-config before compilation to search directories
+        # containing .pc files that describe the libraries that need to be linked to your program.
+        "--suffix"
+        "PKG_CONFIG_PATH"
+        ":"
+        "${lib.makeSearchPathOutput "dev" "lib/pkgconfig" [stdenv.cc.cc zlib]}"
+      ];
+
       # Currently we use lazy.nvim as neovim's package manager, so comment this one.
       #
       # NOTE: These plugins will not be used by astronvim by default!
diff --git a/modules/nixos/desktop/fhs.nix b/modules/nixos/desktop/fhs.nix
index 456c4d33..019e6909 100644
--- a/modules/nixos/desktop/fhs.nix
+++ b/modules/nixos/desktop/fhs.nix
@@ -16,4 +16,30 @@
           })
     )
   ];
+
+  # https://github.com/Mic92/nix-ld
+  #
+  # nix-ld will install itself at `/lib64/ld-linux-x86-64.so.2` so that
+  # it can be used as the dynamic linker for non-NixOS binaries.
+  #
+  # nix-ld works like a middleware between the actual link loader located at `/nix/store/.../ld-linux-x86-64.so.2`
+  # and the non-NixOS binaries. It will:
+  #
+  #   1. read the `NIX_LD` environment variable and use it to find the actual link loader.
+  #   2. read the `NIX_LD_LIBRARY_PATH` environment variable and use it to set the `LD_LIBRARY_PATH` environment variable
+  #      for the actual link loader.
+  #
+  # nix-ld's nixos module will set default values for `NIX_LD` and `NIX_LD_LIBRARY_PATH` environment variables, so
+  # it can work out of the box:
+  #
+  #  - https://github.com/NixOS/nixpkgs/blob/nixos-24.05/nixos/modules/programs/nix-ld.nix#L37-L40
+  #
+  # You can overwrite `NIX_LD_LIBRARY_PATH` in the environment where you run the non-NixOS binaries to customize the
+  # search path for shared libraries.
+  programs.nix-ld = {
+    enable = true;
+    libraries = with pkgs; [
+      stdenv.cc.cc
+    ];
+  };
 }