Bitbake

TL;DR: bakar is a Python CLI that wraps kas and kas-container for Yocto Board Support Package (BSP) builds. It defaults to container builds via kas-container when KAS_CONTAINER_IMAGE is set, and falls back to plain kas on the host when it is not. Pass --host to any subcommand to force host mode. On top of kas, bakar adds pre-flight environment checks before the build starts, applies a curated tuning overlay (ccache, fetch mirrors, reproducibility knobs) without modifying your YAML on disk, writes structured per-run logs, and provides bakar triage to locate the failing recipe after a crash. For vendor BSPs that ship as repo manifests (NXP i.MX) or oe-layertool configs (TI Sitara), it translates those to kas YAMLs automatically. For projects initialized with bitbake-setup (the official Yocto 5.3+ workspace tool), bakar detects the workspace automatically, translates the JSON layer config to a kas YAML, and drives the same pipeline. Install: uv tool install bakar. ...

Every Yocto user eventually copies the same handful of tunables into local.conf to make builds bearable. ccache, a parallelism bump, a longer fetch timeout, a couple of PREMIRROR lines, an image-features prune. The recipe gets passed around in chat, lands on a wiki, gets forked into a layer. What rarely gets passed around is the failure mode each line buys you. Every one of these knobs swaps “slow” for “different failure mode”, and the new mode shows up at the worst possible time - mid-fetch on a CI runner, or at link time when the box runs out of memory. ...