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I came across this crate the other day randomly - yet *another*
dtolnay dependency. We have a bunch of these inline multi-line
strings that are just much nicer to read this way.
I only converted this one use, if this merges I'll do more
over time.
In preparation for publishing this to crates.io and moving
into e.g. github.com/ostreedev/ostree-host-rs
So that ostree upstream can move forward with more Rust on the
"top level".
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.
We have fully transitioned to cxx-rs! This drops a lot of now
dead code; only one binding system to think about generating
source code. For example, a notable advantage of cxx-rs
is it doesn't scan the whole source code, so running `make`
doesn't spew errors from cbindgen not understanding bits.
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.
This way we at least get unit test coverage (which...
our unit test coverage doesn't do much because our
main code paths require privileges or virt).
One main blocker to this is that rustc doesn't expose
first-class support for this yet:
https://github.com/rust-lang/rust/issues/39699
At a practical level this works when building in release
mode but fails with `cargo test` for some reason; linker
arguments being pruned? Not sure.
So I was able to use this when composing to find a bug,
but then for some other reason the client
side apparently infinite loops inside libsolv.
So we're not enabling this yet for those reasons, but
let's land the build infrastructure now.
```
(lldb) thread backtrace
* thread #4, name = 'pool-/usr/bin/r'
* frame #0: 0x00007fd61b97200f libc.so.6`__memcpy_sse2_unaligned_erms + 623
frame #1: 0x00007fd61cbc88e6 libasan.so.6`__asan::asan_realloc(void*, unsigned long, __sanitizer::BufferedStackTrace*) + 214
frame #2: 0x00007fd61cc4b725 libasan.so.6`__interceptor_realloc + 245
frame #3: 0x00007fd61baec43e libsolv.so.1`solv_realloc + 30
frame #4: 0x00007fd61baf0414 libsolv.so.1`repodata_add_dirstr + 276
frame #5: 0x00007fd61bb6f755 libsolvext.so.1`end_element + 53
frame #6: 0x00007fd61b05855d libxml2.so.2`xmlParseEndTag1.constprop.0 + 317
frame #7: 0x00007fd61b063548 libxml2.so.2`xmlParseTryOrFinish.isra.0 + 888
frame #8: 0x00007fd61af7ed20 libxml2.so.2`xmlParseChunk + 560
frame #9: 0x00007fd61bb727e7 libsolvext.so.1`solv_xmlparser_parse + 183
frame #10: 0x00007fd61bb5ea0e libsolvext.so.1`repo_add_rpmmd + 254
frame #11: 0x000055a4fce7a5f5 rpm-ostree`::load_filelists_cb(repo=<unavailable>, fp=<unavailable>) at dnf-sack.cpp:444:23
frame #12: 0x000055a4fce7cad6 rpm-ostree`load_ext(_DnfSack*, libdnf::Repo*, _hy_repo_repodata, char const*, char const*, int (*)(s_Repo*, _IO_FILE*), _GError**) at dnf-sack.cpp:430:13
frame #13: 0x000055a4fce7df60 rpm-ostree`dnf_sack_load_repo at dnf-sack.cpp:1789:26
frame #14: 0x000055a4fce7eee9 rpm-ostree`dnf_sack_add_repo at dnf-sack.cpp:2217:28
frame #15: 0x000055a4fce7f0fb rpm-ostree`dnf_sack_add_repos at dnf-sack.cpp:2271:32
frame #16: 0x000055a4fce870ee rpm-ostree`dnf_context_setup_sack_with_flags at dnf-context.cpp:1796:29
frame #17: 0x000055a4fcdf757f rpm-ostree`rpmostree_context_download_metadata at rpmostree-core.cxx:1206:44
frame #18: 0x000055a4fcdf95c3 rpm-ostree`rpmostree_context_prepare at rpmostree-core.cxx:2001:48
frame #19: 0x000055a4fce54ab7 rpm-ostree`rpmostree_sysroot_upgrader_prep_layering at rpmostree-sysroot-upgrader.cxx:1018:38
frame #20: 0x000055a4fcdcb143 rpm-ostree`deploy_transaction_execute(_RpmostreedTransaction*, _GCancellable*, _GError**) at rpmostreed-transaction-types.cxx:1445:49
frame #21: 0x000055a4fcdba4cd rpm-ostree`transaction_execute_thread(_GTask*, void*, void*, _GCancellable*) at rpmostreed-transaction.cxx:340:34
frame #22: 0x00007fd61c58f7e2 libgio-2.0.so.0`g_task_thread_pool_thread + 114
frame #23: 0x00007fd61c3d7e54 libglib-2.0.so.0`g_thread_pool_thread_proxy.lto_priv.0 + 116
frame #24: 0x00007fd61c3d52b2 libglib-2.0.so.0`g_thread_proxy + 82
frame #25: 0x00007fd61b8af3f9 libpthread.so.0`start_thread + 233
frame #26: 0x00007fd61b9c9903 libc.so.6`__clone + 67
(lldb)
```
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.
We now have bidirectional calling between Rust and C++,
but we are generating two static libraries that we then
link together with a tiny C++ `main.cxx`.
Let's make another huge leap towards oxdiation by
having Rust be the entrypoint. This way cargo natively
takes care of linking the internal Rust library, and
our C++ internals become the library.
In other words, we've now fully inverted from
"C app with internal Rust library"
to "Rust binary with internal C++ library".
In order to make this work though we have to finally
kill the C unit tests. But mostly everything covered
there is either being converted to Rust, or covered
elsewhere anyways.
Now as the doc comments in `main.rs` say...this is
a bit awkward because all the CLI code is still in C++.
Porting stuff to use e.g. `structopt` natively would
be a bit of a slog. For now, we basically rely on
the fact that the Rust-native CLIs are all hidden
commands.
Update submodule: libdnf
The way this tries to replace the system Rust is hacky and
actually I realized belatedly I may have broken it recently; basically
`installdeps.sh` re-adds the system one, and it's hard to be sure
with our current buildsystem we're using the newer one from `$PATH`.
What we really want to do here is use a CentOS8 buildroot,
which will automatically enforce this in a better way along
with solving other problems. But right now we've broken
that because libdnf requires a too-new libmodulemd.
So let's just rely on the Fedora rust for now.
This allows us to fully use cxx-rs with `extern "C++"`. Now
we do call back into the C/C++ today, but it only works outside
of cargo/Rust's knowledge. Most notably, it means we can't
use our C code in `cargo test`. And that's a problem
for moving some C/C++ code to Rust, because we want to port
the unit tests too.
For now, re-declare our dependencies and part of the build
system inside the Cargo build. However, this is also
an important step towards using Cargo as our *sole* build
system.
We don't add build dependencies too often, so the short
term duplication should be OK.
However, a major unfortunate side effect of this is that
we now need to serialize the build process; almost all the
C/C++ comes first (`librpmostreeinternals.la`) and then
the Rust build, then we finally generate the executable
with both.
The only way out of this really is to move more of the
C/C++ build into Cargo, and we probably want to refactor
into internal crates.
