Added

• libcnb-test:
  • Added ContainerConfig::bind_mount to support mounting a host machine file or directory into a container. (#871)

Added

• libherokubuildpack:
  • Added inventory module. (#861)

Changed

• libcnb-test:
  • pack build is now run with --trust-extra-buildpacks to force the builder to be trusted after upstream changes in Pack CLI. Pack CLI v0.35.1+ is now required to use libcnb-test. (#855)

Added

• libcnb:
  • A new API for working with layers has been added. See the BuildContext::cached_layer and BuildContext::uncached_layer docs for examples of how to use this API. (#814)

Changed

• libcnb:
  • The Layer trait and related types and functions have been deprecated. Please migrate to the new API. (#814)
  • Errors related to layers have been restructured. While this is technically a breaking change, buildpacks usually don't have to be modified in practice. (#814)

Fixed

• libcnb-data:
  • The working directory for launch processes specifying a WorkingDirectory::Directory value is now respected. (#831)

Added

• libcnb:
  • Target now implements Clone and Debug. (#821)

Changed

• libcnb:
  • Changed the type of Target's distro_name and distro_version fields from Option<String> to String. (#821)
  • The libcnb runtime now enforces that the CNB_TARGET_DISTRO_NAME and CNB_TARGET_DISTRO_VERSION env vars have been set by lifecycle. (#821)

Added

• libcnb:
  • Made Target (the type of DetectContext::target and BuildContext::target) public. (#815)

Changed

• libcnb:
  • WriteLayerError changed to contain more specific error enums instead of generic ones. (#786)
• libcnb-data:
  • Renamed Target to BuildpackTarget to disambiguate it from the new libcnb::Target. (#815)

Added

• libcnb-data:
  • Reintroduced support for deserializing [[stacks]] in buildpack.toml.
    (#789)
• libherokubuildpack:
  • Added buildpack_output module. This will help buildpack authors provide consistent and delightful output to their buildpack users (#721)

Changed

• Now targets Buildpack API 0.10. Buildpacks need to upgrade the api key to 0.10 in their buildpack.toml. (#773)
• Improved the consistency of cross-compilation assistance provided across all supported target_triple and host OS/architecture combinations. #769
• Added cross-compilation assistance for aarch64-unknown-linux-musl (on macOS and ARM64 Linux) and x86_64-unknown-linux-musl (on ARM64 Linux). #769
• Raised Minimum Supported Rust Version (MSRV) to 1.76. (#774)
• libcnb:
  • Changed Layer interface from &self to &mut self. (#669)

Added

• libherokubuildpack:
  • MappedWrite::unwrap for getting the wrapped Write back out. (#765)

Removed

• Types, errors, macros and functions related to stacks. The concept of stacks has been removed from the CNB spec. Use Target instead. (#773)

Added

• libcnb:
  • An optional trace feature has been added that emits OpenTelemetry tracing
    data to a File Export. (#723)

Changed

• Raised Minimum Supported Rust Version (MSRV) to 1.74. (#747)
• Improved the consistency of all user-facing libcnb.rs error message wordings. (#722)
• The assistance error message shown when the necessary cross-compilation tools are not found now also includes the rustup target add step. (#729)
• Updated the documentation for TestRunner::build and TestContext::start_container to mention when Docker resource teardown occurs. (#743)

Fixed

• libcnb-test:
  • Fixed incorrect error messages being shown for buildpack compilation/packaging failures. (#720)
  • The Docker volumes created by Pack for the build and launch layer caches are now cleaned up after each test. (#741)
  • The Docker image cleanup process no longer makes duplicate attempts to remove images when using TestContext::rebuild. (#741)
  • Test failures due to the Docker daemon not being installed or started no longer cause a non-unwinding panic abort with noisy traceback. (#741)
  • Containers created by TestContext::start_container are now correctly cleaned up if the container failed to start. (#742)