Using --gid flag throws "operation not permitted"

[jamsinclair]

I've compiled my own catfs binary from the latest master branch

When mounting with the following:

catfs --gid 1001 --uid 1000 /test-source /test-cache /test

I get the following error:

ERROR - Cannot mount: Operation not permitted (os error 1)    0: catfs::catfs::error::RError<E>::from
   1: catfs::main
   2: std::sys_common::backtrace::__rust_begin_short_backtrace
   3: std::rt::lang_start::{{closure}}
   4: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once
             at /rustc/09c42c45858d5f3aedfa670698275303a3d19afa/library/core/src/ops/function.rs:259:13
      std::panicking::try::do_call
             at /rustc/09c42c45858d5f3aedfa670698275303a3d19afa/library/std/src/panicking.rs:403:40
      std::panicking::try
             at /rustc/09c42c45858d5f3aedfa670698275303a3d19afa/library/std/src/panicking.rs:367:19
      std::panic::catch_unwind
             at /rustc/09c42c45858d5f3aedfa670698275303a3d19afa/library/std/src/panic.rs:129:14
      std::rt::lang_start_internal::{{closure}}
             at /rustc/09c42c45858d5f3aedfa670698275303a3d19afa/library/std/src/rt.rs:45:48
      std::panicking::try::do_call
             at /rustc/09c42c45858d5f3aedfa670698275303a3d19afa/library/std/src/panicking.rs:403:40
      std::panicking::try
             at /rustc/09c42c45858d5f3aedfa670698275303a3d19afa/library/std/src/panicking.rs:367:19
      std::panic::catch_unwind
             at /rustc/09c42c45858d5f3aedfa670698275303a3d19afa/library/std/src/panic.rs:129:14
      std::rt::lang_start_internal
             at /rustc/09c42c45858d5f3aedfa670698275303a3d19afa/library/std/src/rt.rs:45:20
   5: main
   6: __libc_start_main
   7: _start

I'm either likely using this software wrong or have some permissioning issues 😅. Let me know if there's something I need to fix on my end or if you need me to provide additional information 🤓

Edit: I am trying to allow other users, or if possible, users of a certain group also access the cached volume.

Thanks for both goofys and catfs these are really cool tools and appreciate your work on them 😊