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This adds support for a new `rpm-ostree compose extensions` command`
which takes a treefile, a new extensions YAML file, and an OSTree repo
and ref. It performs a depsolve and downloads the extensions to a
provided output directory.
This is intended to replace cosa's `download-extensions`:
https://github.com/coreos/coreos-assembler/blob/master/src/download-extensions
The input YAML schema matches the one accepted by that script.
Some differences from the script:
- We have a guaranteed depsolve match and thus can avoid silly issues
we've hit in RHCOS (like downloading the wrong `libprotobuf` for
`usbguard` -- rhbz#1889694).
- We seamlessly re-use the same repos defined in the treefile, whereas
the cosa script uses `reposdir=$dir` which doesn't have the same
semantics (repo enablement is in that case purely based on the
`enabled` flag in those repos, which may be different than what the
rpm-ostree compose ran with).
- We perform more sanity-checks against the requested extensions, such
as whether the extension is already in the base.
- We support no-change detection via a state SHA512 file for better
integration in cosa and pipelines.
- We support a `match-base-evr` key, which forces the extension to have
the same EVR as the one from a base package: this is helpful in the
case of extensions which complement a base package, esp. those which
may not have strong enough reldeps to enforce matching EVRs by
depsolve alone (`kernel-headers` is an example of this).
- We don't try to organize the RPMs into separate directories by
extension because IMO it's not at the right level. Instead, we should
work towards higher-level metadata to represent extensions (see
https://github.com/openshift/os/issues/409 which is related to this).
Closes: #2055
cxx-rs has support for bridging types, but it's more awkward
for us because those types are defined in other crates, so
we need to do a newtype dance. Further cxx-rs doesn't currently
support automatically generating wrappers, so add a custom
`gobj_wrap()` for now.
cxx.rs (aka cxxbridge) and cbindgen are
both generating source code. Since the last release
we've introduced the former, and we need to ensure
that the generated cxx.rs source ends up in release tarballs
the same way as the cbindgen code.
Rationalize and clean up the binding infrastructure.
Drop support for the vendored cbindgen which we
weren't actually using:
Closes: https://github.com/coreos/rpm-ostree/issues/2392
Move the cxx-rs and cbindgen bits into the same place,
and update our CoreOS CI build to use a separate `Makefile.bindings`
that just generates the code, so our CI still "works like"
a main Koji RPM build.
Rust has a nice crate for doing perfect hashing. Move that
code into Rust and drop the dependency on `gperf`. This also
helps move away from Autotools.
This is much better than bindgen because it's fully safe. It's
much more ergonomic too:
- Invoke Rust methods-on-structs just like C++ methods-on-structs
- Rust `Result<>` is translated automatically to exceptions
See https://cxx.rs/context.html for more.
I think we should have done this as soon as it was clear that
Rust was sticking and not just an optional thing.
Reasons to make this change now:
- More clear that Rust is going to be the majority of code in the future
- `cargo build` and `cargo test` in a fresh git clone Just Work
- Paves the way for using `cargo` to build C/C++ instead of Automake
