heroku/libcnb.rs

View on GitHub

A framework for writing Cloud Native Buildpacks in Rust

Stars: 47
Forks: 8
Open beginner issues: 0
Indexed issues: 79
Avg merge: 20h 13m
Merged PRs (30d): 4

Dominant language: Rust
License: BSD-3-Clause
Last GitHub push: Sep 7, 2026
Latest indexed: Sep 17, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Open All

79 open issues indexed

Provide a consistent way to control log verbosity (`BP_LOG_LEVEL`) Open

enhancement libherokubuildpack

heroku/libcnb.rs#98 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Ensure API consistency for builders and builder-like types Open

breaking change libcnb libcnb-data

heroku/libcnb.rs#166 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
Add custom metadata examples to `BuildpackDescriptor` docs Open

documentation libcnb-data

heroku/libcnb.rs#253 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Report issues with buildpack layer env spec upstream Open

upstream issue

heroku/libcnb.rs#264 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Automatically wait for services inside the container to bind Open

enhancement faster tests libcnb-test

heroku/libcnb.rs#280 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Add an example showing error handling best practices Open

examples

heroku/libcnb.rs#287 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Support using `BuildPlanBuilder` without chaining Open

enhancement libcnb-data

heroku/libcnb.rs#295 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Add docs for `BuildPlanBuilder` Open

documentation libcnb

heroku/libcnb.rs#297 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Test on Windows in CI Open

enhancement

heroku/libcnb.rs#317 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
`BuildPlanBuilder::or()` can add empty `Or` entries Open

bug libcnb-data

heroku/libcnb.rs#348 · 0 comments · 0 reactions · 2 assignees · Indexed Sep 17, 2026
Add tests for `BuildPlanBuilder` Open

libcnb-data

heroku/libcnb.rs#349 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Adds rustdocs to more of the public API Open

documentation libcnb libcnb-cargo libcnb-data libcnb-package libcnb-proc-macros libcnb-test libherokubuildpack

heroku/libcnb.rs#352 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Support packaging additional buildpack artifacts/assets Open

enhancement libcnb-package

heroku/libcnb.rs#353 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Provide serialized `pack inspect` result in integration tests Open

enhancement libcnb-test

heroku/libcnb.rs#354 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Detect mismatched `libcnb-cargo`, `libcnb-test` and `libcnb` versions Open

libcnb libcnb-cargo libcnb-test

heroku/libcnb.rs#358 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Make it harder to forget to use `--release` when packaging for production Open

libcnb-cargo

heroku/libcnb.rs#359 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Update `exec.d` example to better demonstrate real-world usage Open

examples

heroku/libcnb.rs#360 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Improve UX for cached layers that have forgotten to implement `existing_layer_strategy()` Open

enhancement libcnb

heroku/libcnb.rs#371 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Custom `Layer::Metadata`: inappropriate serialization (?) and silent failure when deserializing Open

libcnb

heroku/libcnb.rs#396 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
libcnb-test: `app::copy_app` does not preserve symlinked directories Open

bug libcnb-test

heroku/libcnb.rs#453 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Lossy numeric LayerContentMetadata Open

bug upstream issue

heroku/libcnb.rs#473 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
`assert_contains!` takes ownership of passed variable Open

enhancement libcnb-test

heroku/libcnb.rs#477 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Support passing `String` to `assert_contains!` not just `&str` Open

enhancement libcnb-test

heroku/libcnb.rs#483 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Add a cargo command for performing both packaging and a `pack build` Open

enhancement libcnb-cargo

heroku/libcnb.rs#484 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Add newtype for `launch::Slice` path globs Open

enhancement libcnb-data

heroku/libcnb.rs#486 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
API 0.8: Use environment variables instead of positional arguments for `bin/detect` and `bin/build` Open

libcnb

heroku/libcnb.rs#491 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
libherokubuildpack's `download_file` can hang (needs timeouts) Open

bug libherokubuildpack

heroku/libcnb.rs#499 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Rename `libcnb::Env::new()` to `libcnb::Env::empty()` Open

breaking change enhancement libcnb

heroku/libcnb.rs#526 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Export `layer_env::PATH_LIST_SEPARATOR` Open

enhancement libcnb

heroku/libcnb.rs#534 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
libcnb-test: Expose Pack build output as combined stdout + stderr Open

enhancement libcnb-test

heroku/libcnb.rs#536 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Typed `store.toml` metadata Open

enhancement libcnb libcnb-data

heroku/libcnb.rs#544 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Inconsistent handling of `store.toml` Open

enhancement libcnb

heroku/libcnb.rs#545 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Linemapped command output indents the trailing newline Open

bug libherokubuildpack

heroku/libcnb.rs#582 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Investigate whether it's worth enabling LTO and/or codegen-units=1 for release builds Open

libcnb-cargo slim buildpacks

heroku/libcnb.rs#591 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Use `cargo-semver-checks` to validate version bumps for new releases Open

enhancement

heroku/libcnb.rs#596 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Support accessing "build config" environment variables (`/cnb/build-config`; upstream RFC 109) Open

enhancement libcnb

heroku/libcnb.rs#597 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
libcnb-cargo: Prevent stdout spam when not packaging for automation Open

libcnb-cargo

heroku/libcnb.rs#600 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Only run `cargo build` once when `cargo libcnb package` is run in monorepo root Open

enhancement faster compiles libcnb-cargo libcnb-package

heroku/libcnb.rs#649 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
Simplify dependency graph implementation Open

enhancement libcnb-package

heroku/libcnb.rs#660 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Replace hardcoded `buildpack.toml` and `package.toml` strings with constants Open

libcnb-cargo libcnb-package

heroku/libcnb.rs#661 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Rename `BuildpackKind::LibCnbRs` to something clearer Open

libcnb-package

heroku/libcnb.rs#683 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Update libcnb-test assertion macros to match Rust 1.73+ style Open

enhancement libcnb-test

heroku/libcnb.rs#694 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Document the need to set an explicit delimiter when using `ModificationBehavior::{Append,Prepend}` Open

documentation libcnb

heroku/libcnb.rs#700 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
`build_libcnb_buildpacks_dependency_graph()` displays the wrong error for `buildpack.toml` IO and TOML parsing errors Open

bug libcnb-package

heroku/libcnb.rs#708 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
`log_error()`, `log_warning()`, `log_info()` and `log_header()` should use `.expect()` instead of `.unwrap()` Open

libherokubuildpack

heroku/libcnb.rs#712 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 17, 2026
Produce license compliant binary distributions Open

libcnb-package

heroku/libcnb.rs#718 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Cross-compilation assistance: Some architecture/target combinations use the GNU GCC binary instead of the MUSL one Open

bug libcnb-package

heroku/libcnb.rs#724 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Cross-compilation assistance: Set the `CXX_*` and `AR_*` environment variables too Open

enhancement libcnb-package

heroku/libcnb.rs#725 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Refactor `libcnb_package::cross_compile_assistance` Open

enhancement libcnb-package

heroku/libcnb.rs#727 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Add libcnb-cargo and libcnb-test tests for cross-compile assistence help text Open

libcnb-cargo libcnb-test

heroku/libcnb.rs#730 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026

heroku/libcnb.rs

Get new issues in your inbox