Refactor flake patching/recursion

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

packages/prometheus-fail2ban-exporter/default.nix

@@ -1,13 +1,13 @@
 { pkgs, ... }:
 # AUTO-UPDATE: nix-update --flake prometheus-fail2ban-exporter
-pkgs.buildGoModule rec {
+pkgs.buildGoModule (finalAttrs: {
   pname = "prometheus-fail2ban-exporter";
   version = "0.10.3";
 
   src = pkgs.fetchFromGitLab {
     owner = "hctrdev";
     repo = "fail2ban-prometheus-exporter";
-    rev = "v${version}";
+    rev = "v${finalAttrs.version}";
     hash = "sha256-CyYGY6SovnvgExB22G+LEKRDRzbDZWhWUjctJMkprYs=";
   };
 
@@ -18,8 +18,8 @@ pkgs.buildGoModule rec {
   ldflags = [
     "-s"
     "-w"
-    "-X main.version=${version}"
-    "-X main.commit=${version}"
+    "-X main.version=${finalAttrs.version}"
+    "-X main.commit=${finalAttrs.version}"
     "-X main.date=1970-01-01T00:00:00Z"
     "-X main.builtBy=NixOS"
   ];
@@ -28,4 +28,4 @@ pkgs.buildGoModule rec {
     mkdir -p $out/bin
     cp -r "$GOPATH/bin/fail2ban-prometheus-exporter" $out/bin/prometheus-fail2ban-exporter
   '';
-}
+})