Add nix derivation for static builds

.gitignore

@@ -55,3 +55,5 @@ dkms.conf
 bin/
 
 vendor/
+
+result

nix/default.nix

@@ -0,0 +1,47 @@
+{ system ? builtins.currentSystem }:
+let
+  pkgs = (import ./nixpkgs.nix {
+    overlays = [ (final: prev: {
+      pcre = prev.pcre.overrideAttrs (x: {
+        configureFlags = x.configureFlags ++ [ "--enable-static" ];
+      });
+    })];
+    config = {
+      packageOverrides = pkg: {
+        glib = pkg.glib.overrideAttrs(x: {
+          outputs = [ "bin" "out" "dev" ];
+          mesonFlags = [
+            "-Ddefault_library=static"
+            "-Ddevbindir=${placeholder ''dev''}/bin"
+            "-Dgtk_doc=false"
+            "-Dnls=disabled"
+          ];
+        });
+        systemd = pkg.systemd.overrideAttrs(x: {
+          mesonFlags = x.mesonFlags ++ [ "-Dstatic-libsystemd=true" ];
+          postFixup = ''
+            ${x.postFixup}
+            sed -ri "s;$out/(.*);$nukedRef/\1;g" $lib/lib/libsystemd.a
+          '';
+        });
+      };
+    };
+  });
+
+  self = with pkgs; {
+    conmon-static = conmon.overrideAttrs(x: {
+      name = "conmon-static";
+      src = ./..;
+      buildInputs = [
+        glib
+        glibc
+        glibc.static
+        pcre
+        systemd
+      ];
+      prePatch = ''
+        export LDFLAGS="-static-libgcc -static"
+      '';
+    });
+  };
+in self

nix/nixpkgs.nix

@@ -0,0 +1,7 @@
+let
+  nixpkgs = import (builtins.fetchTarball {
+    name = "nixos-unstable";
+    url = "https://github.com/NixOS/nixpkgs/archive/260b2af29281cfc1e5d2ea7ae8dbb1e38a16e896.tar.gz";
+    sha256 = "0h70dn8sx60976gycifg5c0dd1pfgclw1vdhazbcniywb1bdsll3";
+  });
+in nixpkgs