facebook/buck2

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Build system, successor to Buck

Stars: 4.4k
Forks: 398
Open beginner issues: 7
Indexed issues: 299

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Sep 20, 2026
Latest indexed: Sep 15, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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298 open issues indexed

InternalRunnerTestInfo: let a test listing report a result without running the test Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

facebook/buck2#1510 · Opened Sep 18, 2026
Consider enabling Immutable Releases in github settings? Open

Difficulty 2/5 1-3 hours Newbie friendliness 52/100

facebook/buck2#1509 · Opened Sep 17, 2026
OSS prelude/apple/*.bzl references 12 config//… packages that upstream doesn't ship Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

facebook/buck2#1492 · Opened Sep 3, 2026
prelude/rust: from_any_dir.py execs the C compiler with os.execl, which does not search PATH — fails with ENOENT under the default system_cxx_toolchain (bare `clang`) Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

facebook/buck2#1491 · Opened Sep 3, 2026
prelude/rust: from_any_dir.py needs Python ≥ 3.12 (Path.relative_to(walk_up=True)) but the bootstrap toolchain runs whatever host python3 is Open

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

facebook/buck2#1490 · Opened Sep 3, 2026
http_archive splits strip_prefix values containing spaces into tar operands Open

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

facebook/buck2#1480 · Opened Aug 31, 2026
buck2 test fails at teardown when a target uses InternalRunnerTestInfo Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

facebook/buck2#1479 · Opened Aug 28, 2026
remote_execution_properties not seeming to work with recent buildbarns Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

facebook/buck2#1477 · 1 comment · Opened Aug 26, 2026
OSS RE client: is_retryable misses transport io errors wrapped in h2::Error Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

facebook/buck2#1475 · 1 comment · Opened Aug 26, 2026
allocative 0.3.6 doesn't compile on nightly anymore Open

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

facebook/buck2#1473 · 1 reaction · Opened Aug 25, 2026
API keys are leaked in buckconfig messages in logs Open

remote execution

Difficulty 3/5 1-2 days Newbie friendliness 52/100

facebook/buck2#1445 · 1 comment · 1 reaction · Opened Aug 5, 2026
Publish Gazebo crates from their Buck2-maintained sources Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

facebook/buck2#1427 · Opened Jul 29, 2026
rust bug: user linked libraries go after `-lc`, breaking `ring` on aarch64-linux Open

rust

Difficulty 4/5 3-5 days Newbie friendliness 45/100

facebook/buck2#1405 · Opened Jul 24, 2026
Idea: `buck2 docs starlark-builtins symbolname` Open

documentation enhancement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

facebook/buck2#1397 · Opened Jul 23, 2026
Make it easier for humans to figure out which configuration of a target failed to build/test Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

facebook/buck2#1395 · 1 comment · Opened Jul 22, 2026
`buck audit cell` returns nonexistent paths for external cells Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

facebook/buck2#1376 · 2 comments · Opened Jul 17, 2026
Allow AnalysisActions.download_file to set headers Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

facebook/buck2#1365 · Opened Jul 7, 2026
Silently skipping implicit targets with incompatible dependencies Open

bug UX

Difficulty 5/5 Over a week Newbie friendliness 38/100

facebook/buck2#1348 · 1 comment · Opened Jun 27, 2026
Symlinked directory breaks `python_bootstrap_binary` Open

bug prelude python

Difficulty 4/5 3-5 days Newbie friendliness 45/100

facebook/buck2#1342 · 1 comment · Opened Jun 12, 2026
Notify file watcher continuously clearing graph state Open

bug io

Difficulty 4/5 3-5 days Newbie friendliness 38/100

facebook/buck2#1338 · 2 comments · Opened Jun 9, 2026
rust-project's `prelude//rust/rust-analyzer/resolve_deps.bxl:resolve_targets` ignores passed-in modifiers Open

bug rust rust-project

Difficulty 3/5 1-2 days Newbie friendliness 55/100

facebook/buck2#1337 · 1 comment · Opened Jun 9, 2026
OpenTelemetry support for Buck2 build observability Open

Observability

Difficulty 5/5 Over a week Newbie friendliness 35/100

facebook/buck2#1316 · 1 comment · 2 reactions · Opened May 9, 2026
tests: fix shipit to export PACKAGE files Open

Needs Meta Attention

facebook/buck2#1313 · 1 assignee · Opened May 4, 2026
FS race conditions in content-based paths Open

bug

Difficulty 5/5 Over a week Newbie friendliness 38/100

facebook/buck2#1309 · 5 comments · 1 reaction · Opened May 1, 2026
toolchains//:cxx_no_default_deps has become mandatory Open

bug Needs Meta Attention prelude

Difficulty 3/5 1-2 days Newbie friendliness 55/100

facebook/buck2#1306 · 2 reactions · Opened Apr 30, 2026
Buck2 remote execution doesn't work when RBE is terminated by nginx or AWS ALB Open

bug remote execution

Difficulty 4/5 3-5 days Newbie friendliness 45/100

facebook/buck2#1294 · Opened Apr 15, 2026
Panic "`"config_values"` is not an id of an argument or a group." Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 63/100

facebook/buck2#1284 · 1 comment · Opened Apr 8, 2026
Regression after DirectIoExecutor by default on macOS Open

apple bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

facebook/buck2#1282 · Opened Apr 3, 2026
Using bundled prelude without prebuilt binaries (NixOS) Open

bug prelude

Difficulty 4/5 3-5 days Newbie friendliness 48/100

facebook/buck2#1277 · 7 comments · Opened Mar 30, 2026
`ArtifactTree::cleanup_finished` panics in open source builds Open

bug

facebook/buck2#1274 · 1 comment · 1 reaction · 1 assignee · Opened Mar 24, 2026
How to config buck2 to build a `hello-world` kotlin-library Open

bug prelude

Difficulty 4/5 3-5 days Newbie friendliness 35/100

facebook/buck2#1267 · 1 comment · Opened Mar 5, 2026
`buck2 audit output` and `ctx.audit().output(...)` do not support toolchain-deps' paths Open

bug bxl

Difficulty 4/5 3-5 days Newbie friendliness 45/100

facebook/buck2#1264 · Opened Mar 2, 2026
Forbid slashes and colons in `labels` Open

UX

Difficulty 3/5 1-2 days Newbie friendliness 35/100

facebook/buck2#1245 · Opened Feb 18, 2026
Feature request: `go_binary` rule should allow generating the linker flags Open

go prelude

Difficulty 4/5 3-5 days Newbie friendliness 48/100

facebook/buck2#1241 · Opened Feb 17, 2026
Feature request: Can `gobuckify` also generate `BUCK` files for packages outside of `vendor/`? Open

go

Difficulty 4/5 3-5 days Newbie friendliness 35/100

facebook/buck2#1239 · Opened Feb 17, 2026
`gobuckify` generates wrong depencies for go packages that have build constraints for different platforms / operating systems Open

go

Difficulty 4/5 3-5 days Newbie friendliness 45/100

facebook/buck2#1238 · Opened Feb 17, 2026
Feature request: Allow specifying the `buck2` path in `gobuckify`. Open

go

Difficulty 3/5 1-2 days Newbie friendliness 30/100

facebook/buck2#1237 · Opened Feb 17, 2026
Packages `buck-resources` and `sorted_vector_map` have BUCK files inside them, thus breaking `reindeer` targets Open

buck2 development bug

Difficulty 4/5 3-5 days Newbie friendliness 30/100

facebook/buck2#1226 · Opened Feb 10, 2026
Buck2 daemon panics on systems with CPU IDs >= 128 (cpuset 160-175) Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 66/100

facebook/buck2#1225 · 1 comment · Opened Feb 8, 2026
Tracking target build status via buck2 log show is unstable due to schema changes Open

Observability UX

Difficulty 5/5 Over a week Newbie friendliness 25/100

facebook/buck2#1224 · 2 comments · Opened Feb 7, 2026
Debugging the action graph is really hard Open

UX

Difficulty 5/5 Over a week Newbie friendliness 25/100

facebook/buck2#1217 · 4 comments · Opened Jan 27, 2026
"can't find crate" when building Rust proc macro with remote execution Open

bug remote execution rust

Difficulty 4/5 3-5 days Newbie friendliness 35/100

facebook/buck2#1206 · 4 comments · Opened Jan 18, 2026
Android Kotlin build fails: cpython_archive select() missing default for cfg:no-san configuration Open

android bug prelude

Difficulty 4/5 3-5 days Newbie friendliness 48/100

facebook/buck2#1204 · 1 comment · 1 reaction · Opened Jan 16, 2026
`prelude//os/...` and `prelude//cpu/...` do not use the new constraint API Open

enhancement prelude

Difficulty 4/5 3-5 days Newbie friendliness 35/100

facebook/buck2#1190 · 1 comment · Opened Dec 28, 2025
[prelude] support cxx 20 named modules Open

enhancement prelude

Difficulty 5/5 Over a week Newbie friendliness 25/100

facebook/buck2#1183 · 5 reactions · Opened Dec 20, 2025
Does `rust_python_extension` exist? Open

prelude python rust

Difficulty 5/5 Over a week Newbie friendliness 35/100

facebook/buck2#1182 · 3 comments · Opened Dec 19, 2025
`attrs.any()` doesn't accept records Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

facebook/buck2#1171 · 1 comment · Opened Dec 9, 2025
String parameter macro artifacts are not materialized when cached or built remotely Open

bug remote execution

Difficulty 4/5 3-5 days Newbie friendliness 45/100

facebook/buck2#1166 · 5 comments · Opened Dec 5, 2025
Tracking issue for LSP typechecking Open

buck_lsp

Difficulty 5/5 Over a week Newbie friendliness 20/100

facebook/buck2#1158 · 6 reactions · Opened Nov 29, 2025
`ctx.actions.write` doesn't propagate `with_inputs` dependencies if given an `OutputArtifact` rather than a `str` filename Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

facebook/buck2#1151 · 1 comment · 1 reaction · Opened Nov 27, 2025

facebook/buck2

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