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cxx-rs only supports a few basic types in `Vec<T>`/`CxxVector<T>`
and we need to pass an array of GObjects in a few cases.
Add a wrapper class hack instead of using `u64` so we at least
have some basic safety here and have a convenient place to
grep for later when we want to improve this.
Right now, we're using libdnf APIs from Rust via hand-crafted `extern C`
interfaces, which is extra dangerous because there is no signature
checking that happens at compile-time.
Until either we can automate libdnf bindings or use its C++ API directly
via cxx.rs, let's do some basic wrapping in C++ ourselves and use libdnf
through that API only instead. That gives us a lot more confidence and
makes the libdnf API feel more natural to use in Rust.
This is now further migration towards Cargo/Rust possible
because we switched our main binary. We've had an internal
`libdnf-sys` crate for a while, but now it can take over
the build of the underlying library too (like many `-sys`
crates support).
This itself is just an incremental step towards migrating
the main rpm-ostree build system to e.g. cmake too (or
perhaps directly with the `cc` crate, not sure yet) and
driving it via `cargo` too.
First explicitly state that we're a workspace. AIUI
this is actually implicit today via our use of a `path`
dependency, but in the future we may have other sub-crates.
So let's make it explicit now.
Also move the libdnf dependencies directly to that sub-crate.
This is just a cleaner arrangement to make the separation more explicit.
It also matches what most other wrapper crates do.
One advantage of this is that we can tell cbindgen directly that we
don't want it to ever export symbols from `libdnf-sys`.
Related discussions in:
https://github.com/coreos/rpm-ostree/pull/2047
