feat: nix builds have the right version and commit

Author: jcmuller

default.nix

@@ -1,12 +1,22 @@
-{pkgs ? import <nixpkgs> {}, ...}:
-pkgs.buildGoModule {
+{
+  self,
+  pkgs ? import <nixpkgs> {},
+  ...
+}:
+pkgs.buildGoModule rec {
+  env.CGO_ENABLED = 0;
   pname = "ess";
   version = pkgs.lib.strings.removeSuffix "\n" (builtins.readFile ./version.txt);
   src = ./.;
   vendorHash = null;
+  ldflags = [
+    "-X 'main.version=${version}-nix'"
+    "-X 'main.commit=${self.rev or "dev"}'"
+  ];
 
   meta = {
     description = "ess (env-sample-sync): automatically and safely synchronize env.sample files with .env";
+    homepage = "https://github.com/acaloiaro/ess";
     license = pkgs.lib.licenses.bsd2;
   };
 }

flake.nix

@@ -6,6 +6,7 @@
   };
 
   outputs = {
+    self,
     nixpkgs,
     flake-utils,
     ...
@@ -17,7 +18,7 @@
         };
       in {
         packages = rec {
-          ess = pkgs.callPackage ./. {inherit pkgs;};
+          ess = pkgs.callPackage ./. {inherit pkgs self;};
           default = ess;
         };