nix: add platforms to meta; allow overriding symlink behaviour

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Ib6e44abd86bd0e58f290b456680a97236a6a6964

nix/package.nix

@@ -4,9 +4,10 @@
   stdenv,
   mold,
   versionCheckHook,
+  createSymlinks ? true,
 }: let
   pname = "stash";
-  version = (builtins.fromTOML (builtins.readFile ../Cargo.toml)).package.version;
+  version = (lib.importTOML ../Cargo.toml).package.version;
   src = let
     fs = lib.fileset;
     s = ../.;
@@ -36,7 +37,7 @@ in
     # generated by the build wrapper are correctly linked, we should link
     # them *manually*. The postInstallCheck phase that follows will check
     # to verify if all of those links are in place.
-    postInstall = ''
+    postInstall = lib.optionalString createSymlinks ''
       mkdir -p $out
       for bin in stash-copy stash-paste wl-copy wl-paste; do
         ln -sf $out/bin/stash $out/bin/$bin
@@ -48,7 +49,7 @@ in
 
     # After the version check, let's see if all binaries are linked correctly.
     # We could probably add a check phase to get the versions of each.
-    postInstallCheck = ''
+    postInstallCheck = lib.optionalString createSymlinks ''
       for bin in stash stash-copy stash-paste wl-copy wl-paste; do
         [ -x "$out/bin/$bin" ] || { echo "$bin missing"; exit 1; }
       done
@@ -65,5 +66,6 @@ in
       license = lib.licenses.mpl20;
       maintainers = [lib.maintainers.NotAShelf];
       mainProgram = "stash";
+      platforms = lib.platforms.linux;
     };
   }