cc7335edc8 ci: run USDT interface test in a VM (0xb10c)
dba6f82342 test: adopt USDT utxocache interface tests (0xb10c)
220a5a2841 test: hook into PID in tracing tests (0xb10c)
Pull request description:
Changes a CI task that runs test the previously not run `test/functional/interface_usdt_*.py` functional tests (added in https://github.com/bitcoin/bitcoin/pull/24358).
This task is run as CirussCI `compute_engine_instance` VM as hooking into the tracepoints is not possible in CirrusCI docker containers (https://github.com/bitcoin/bitcoin/issues/23296#issuecomment-1024920845). We use an unoffical PPA and untrusted `bpfcc-tools` package in the CI as the Ubuntu jammy and Debian bullseye packages are outdated. We hope use an official package when new Ubuntu/Debian releases are available for the use with Google Compute Engine.
We make sure to hook into `bitcoind` binaries in USDT interface tests via their PID, instead of their path. This makes sure multiple functional tests running in parallel don't interfere with each other.
The utxocache USDT interface tests is adopted to a change of the functional test framework that wasn't detected as the tests weren't run in the CI. As the tracepoints expose internals, it can happen that we need to adopt the interface test when internals change. This is a bit awkward, and if it happens to frequently, we should consider generalizing the tests a bit more. For now it's fine, I think.
See the individual commit messages for more details on the changes.
Fixes https://github.com/bitcoin/bitcoin/issues/24782
Fixes https://github.com/bitcoin/bitcoin/issues/23296
I'd like to hear from reviewers:
- Are we OK with using the [`hadret/bpfcc`](https://launchpad.net/~hadret/+archive/ubuntu/bpfcc) PPA for now? There is a clear plan when to drop it and as is currently, it could only impact the newly added VM task.
- ~~Adding a new task increases CI runtime and costs. Should an existing `container` CI task be ported to a VM and reused instead?~~ Yes, see https://github.com/bitcoin/bitcoin/pull/25528#issuecomment-1179509525
ACKs for top commit:
MarcoFalke:
cr ACK cc7335edc8
Tree-SHA512: b7fddccc0a77d82371229d048abe0bf2c4ccaa45906497ef3040cf99e7f05561890aef4c253c40e4afc96bb838c9787fae81c8454c6fd9db583276e005a4ccb3
eeb5a94e27