bakar

kas-based BSP build orchestrator for Yocto. Wraps kas-container with manifest-driven sync, pre-flight checks, a live event-driven build UI, structured telemetry, and post-mortem tooling. Works with NXP i.MX (repo XML), TI Sitara (oe-layertool), bitbake-setup workspaces, and any bring-your-own kas YAML.

Features

• Multi-BSP, out of the box - NXP i.MX (repo XML), TI Sitara (oe-layertool), bitbake-setup workspaces, meta-avocado, and any bring-your-own kas YAML, with automatic family detection. See docs/workspace.md.
• Idempotent build pipeline - doctor -> sync -> gen-kas -> kas-container build in one command, with dry-run, --dry-run-script (emit a runnable shell script for the full invocation), keep-going, and from-scratch rebuild. See docs/build.md, docs/sync.md, docs/gen-kas.md.
• Pre-flight diagnostics - ~30 host/container/workspace checks with PASS/WARN/BLOCK gating and PSI throttle calibration. See docs/doctor.md.
• Live build UI - driven by bitbake's own structured event stream (with a knotty-text fallback): a parse → setscene → tasks pipeline header with per-stage durations and a global wall clock, an sstate reuse ratio ("92% sstate (412 cached, 38 will build)"), a parse cache efficiency note, and a per-task table with task-type icons. Stuck-task highlighting compares each recipe against per-recipe timing baselines accumulated across builds, not just the current run's median. On a task failure the build status freezes above the error text and a ✗ FAILED alert carries the host-side log path plus the last lines of the task log. Assumes a truecolor terminal and a Nerd Font.
• Observability and post-mortem - per-run telemetry (events.jsonl, logs, timing, disk usage) plus a normalized bitbake event stream (bitbake-events.json) parsed from bitbake's own event log on every build. bakar triage reads that artifact to name the failing recipe/task and print the recorded logfile excerpt (with a kas.log fallback for older runs), and selects the right run dir under a multi-release preset fan-out via --run/--preset/--release. See docs/triage.md, docs/report.md, docs/log.md.
• Reproducibility - pin floating layer SHAs, diff manifests/configs, detect workspace drift (bakar drift), generate release notes between pinned states (bakar changelog), flatten the resolved kas YAML, pre-fetch sources for offline builds, and seed a host-side premirror git2_*.tar.gz tarball from a git URL. See docs/lock.md, docs/diff.md, docs/drift.md, docs/changelog.md, docs/dump.md, docs/prefetch.md, docs/mirror.md.
• Recipe operations - run one recipe or task through bakar bitbake (logged, exit-code-faithful), clean a single recipe's sstate with bakar clean-recipe, rebuild one from scratch (cleansstate then build) with bakar rebuild, and analyze a recipe's dependency graph (blast radius, longest chain, cycles) with bakar graph. See docs/bitbake.md, docs/graph.md.
• Build performance and robustness - ccache (per-workspace or shared), NPROC-scaled parallelism, PSI throttling with ratchet-up autocalibration, curated mirrors, persistent hash-equivalence server, and age-based sstate/ccache pruning. See docs/hashserv.md, docs/clean-cache.md.
• Shell and scripting - interactive/one-shot kas-container shell, run a command in every source repo, boot a QEMU image from the build dir. See docs/shell.md, docs/for-all.md, docs/run.md.
• Named presets - name a full build configuration in config.toml and invoke it with bakar build --preset <name>; multi-release presets fan out to N sequential builds with a summary table. Manage presets with bakar presets list/show/add/remove. See docs/presets.md.
• Shell completion - tab-completion for all subcommands, flags, and preset names. bash and zsh via bakar --install-completion; fish via a generator script. See docs/completion.md.
• Layered configuration - CLI > BAKAR_* env > workspace .bakar.toml > preset > user config.toml > BSP default, plus a settings CRUD interface and a vendor config layer for custom board families. See docs/settings.md, docs/configuration.md.
• Advanced tooling - swap the BSP-bundled bitbake for a local upstream checkout, and stress-test the bitbake parser fork race. See docs/bitbake-override.md, docs/stress-parse.md.
• Workspace scaffolding - init wizard (interactive or --family) writes .bakar.toml. See docs/init.md.
• Read-only inspection - query any BitBake variable (getvar), dump resolved build metadata (show), inspect layer stack and override precedence (layers inspect/status), compare task signatures across builds (diffsigs), and walk the full recipe environment (inspect). See docs/getvar.md, docs/show.md, docs/layers.md, docs/inspect.md, docs/diffsigs.md.

Install

uv tool install bakar
# or
pip install bakar

Quickstart

# NXP i.MX manifest-driven build
bakar build -f imx-6.12.49-2.2.0.xml -m imx8mp-var-dart

# Bring-your-own kas YAML
bakar build my-project.yml

# Post-mortem a failed build
bakar triage

Documentation

Full command reference, workflow guides, and configuration: docs/index.md