libguestfs-with-appliance: warn in case of version mismatch

Author: lukts30

pkgs/by-name/li/libguestfs-with-appliance/package.nix

@@ -1,3 +1,12 @@
-{ libguestfs, libguestfs-appliance }:
+{
+  lib,
+  libguestfs,
+  libguestfs-appliance,
+}:
 
-libguestfs.override { appliance = libguestfs-appliance; }
+# https://github.com/NixOS/nixpkgs/issues/280881
+lib.warnIf (builtins.compareVersions libguestfs.version libguestfs-appliance.version > 0)
+  "libguestfs has a higher version than libguestfs-appliance (${libguestfs.version} > ${libguestfs-appliance.version}), runtime errors may occur!"
+
+  libguestfs.override
+  { appliance = libguestfs-appliance; }