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Same motivation as https://github.com/coreos/bootupd/pull/163
Effectively what we're doing here is creating a human-readable subset
of the stack trace. This is nicer than having the calling functions
add with_context() because it's more verbose (gets duplicative at
each call site), easy to forget, etc.
This stubs out sufficient infrastructure for us to register
as a client and call the Moo API.
A glaring problem here is the lack of extensive `glib::Variant`
bindings; that's covered in the next gtk-rs release.
My real goal was to try porting the `rpmostree-builtin-apply-live.cxx`
code entirely to Rust, but there's more to do to expose the
transaction helper APIs we have.
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.
More prep for https://github.com/coreos/rpm-ostree/pull/2388
This was actually also my first time really trying out the
latest gtk-rs `glib::Variant` API, which is one of the major
things we need to use to progress oxidation more.
It turns out we accidentally added GPL'd code into the Rust
side, which wasn't intentional on my part and I think it's since
been copied around.
Honestly I think half of the problem is the gigantic
"blah blah blah GNU General blah blah" just makes people's eyes
glaze over. In contrast the `SPDX-License-Identifier` is short
and obvious.
So let's validate that in CI.
This follows a similar change in ostree:
https://github.com/ostreedev/ostree/pull/1439
If we merge this I'll do the C/C++ side too after that.
When we started using cxxrs, most of the glib-rs objects like
`OstreeRepo`/`OstreeSysroot` were owned by C++ and passed
down into Rust. That motivated the addition of the special
bridging infrastructure to re-create a glib-rs wrapper
type from what cxxrs wants (a `Pin<&mut T>`).
But now that we're adding more in Rust, we have the need
to pass these objects back into C++. In fact this will
hopefully soon because the default case as more of the
binary entrypoint becomes Rust.
Add another trait with a method `gobj_rewrap()` that converts
in the other direction. This implementation took me a number
of tries before I finally settled on simply using `mem::transmute()`.
There are a *lot* of caveats listed on the docs for that function,
but I think it really is what we want here. See the link for pending work
on a Rust RFC to enable safe transmutes for some cases, and I believe
that would cover this use case:
https://internals.rust-lang.org/t/pre-rfc-v2-safe-transmute/11431
I've verified this works in a separate patch, but this commit
also adds a simple test case - this goes all the way from:
Rust glib-rs `ostree::Repo` (holding strong ref)
-> Rust `Pin<&mut ostree_sys::OstreeRepo>`
-> (internal cxx-rs C bridge)
-> C++ `OstreeRepo&` reference
-> C `OstreeRepo*` pointer
Which is quite the dance if you think about it!
This is a workaround for the non-customizability of the cxx-rs
propagation of Rust result to C++ exception. Right now we're
losing context. Work around this by formatting on the Rust
side at exit points, explicitly converting an `anyhow::Error`
by printing it in "single line context".
Since we're likely to gain more things like this, unify
this with `cxx_bridge_gobject::` into a single `cxxrsutil::`.
