cargo-mobile2: refactor

this shouldn't create any rebuilds

pkgs/by-name/ca/cargo-mobile2/package.nix

@@ -8,16 +8,14 @@
   makeWrapper,
 }:
 
-let
+rustPlatform.buildRustPackage (finalAttrs: {
   pname = "cargo-mobile2";
   version = "0.22.2";
-in
-rustPlatform.buildRustPackage {
-  inherit pname version;
+
   src = fetchFromGitHub {
     owner = "tauri-apps";
     repo = "cargo-mobile2";
-    rev = "cargo-mobile2-v${version}";
+    rev = "cargo-mobile2-v${finalAttrs.version}";
     hash = "sha256-pSp7w823Jjjg0PEnCc7jVLBbOgvR7JAjtD8OK5voC0A=";
   };
 
@@ -27,12 +25,6 @@ rustPlatform.buildRustPackage {
 
   cargoHash = "sha256-aci1QF/O2J6Yix4UkxPCVW+c+xoqm7AvdhlkF7y1GqA=";
 
-  preBuild = ''
-    mkdir -p $out/share/
-    # during the install process tauri-mobile puts templates and commit information in CARGO_HOME
-    export CARGO_HOME=$out/share/
-  '';
-
   buildInputs = [ openssl ];
   nativeBuildInputs = [
     pkg-config
@@ -40,6 +32,12 @@ rustPlatform.buildRustPackage {
     makeWrapper
   ];
 
+  preBuild = ''
+    mkdir -p $out/share/
+    # during the install process tauri-mobile puts templates and commit information in CARGO_HOME
+    export CARGO_HOME=$out/share/
+  '';
+
   preFixup = ''
     for bin in $out/bin/cargo-*; do
       wrapProgram $bin \
@@ -56,4 +54,4 @@ rustPlatform.buildRustPackage {
     ];
     maintainers = with lib.maintainers; [ happysalada ];
   };
-}
+})