Configuration

Every field in provium.toml — the [provium] section (roots, cache_dir, cache_max_size) and the [profiles.<name>] blocks (kernel, initrd, cmdline, guest_os).

Patterns for using multiple profiles — testing across kernel versions, separating production from debug builds, gating slow tests on the mainline-only profile, and what happens to the fixture cache when profiles change.

Make a profile build its own image before the VM boots — the build command, the {out} token that keeps inputs and outputs from drifting, reading a cmdline from the builder, and the prepare / --no-build controls.