libcdio and cdio-rust release plans

[rocky]

Note: Things have changed since the first draft of this discussion

@skr4n has been doing great work this summer on building an MMC library in Rust.
Along with that, he's also identified several bugs in libcdio.

We plan to have three distinct packages under the libcdio umbrella:

libcdio

The C library we all know of. We have decided not to introduce any Rust here. Its development will be as usual, independent of the Rust packages, with v2.4.0 coming soon.

libcdio-rs

This is a Rust implementation of the library portion of libcdio. Currently, it's on feature parity with all the MMC routines in libcdio. Apart from that, it also provides safe interfaces to a few ISO 9660 and UDF routines.

libcdio-cli

This is a Rust implementation of the CLI utility programs bundled with libcdio (iso-read, iso-info, etc). Currently, it implements four of the eight command-line programs in C libcdio. We plan to remove the utility programs from libcdio in a 3.0.0 release when all the programs get ported. For a while, there will be parallel development of libcdio 2.4.x along with libcdio 3.x

libcdio-rs and libcdio-cli will have their first public release just before the end of Google's Summer of Code (around the end of August).

In the first release, libcdio-rs contains only Rust-based code to handle MMC commands. These are used only in libcdio-cli.

I welcome your thoughts and comments.

[rocky]

Instead of a 3.0.0 release, I am now thinking that the release that removes the CLI utilities would be called 4.0.0. That will leave 3.x for one more major revision of libcdio as it currently stands.

There may never be a 3.0.0 release, but we may as well reserve that slot.