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Speed up VM create with work seeds

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Beat VM create wall time without changing VM semantics.

Generate a work-seed ext4 sidecar during image builds and rootfs rebuilds, then clone and resize that seed for each new VM instead of rebuilding /root from scratch. Plumb the new seed artifact through config, runtime metadata, store state, runtime-bundle defaults, doctor checks, and default-image reconciliation so older images still fall back cleanly.

Add a daemon TAP pool to keep idle bridge-attached devices warm, expose stage timing in lifecycle logs, add a create/SSH benchmark script plus Make target, and teach verify.sh that tap-pool-* devices are reusable capacity rather than cleanup leaks.

Validated with go test ./..., make build, ./verify.sh, and make bench-create ARGS="--runs 2".
This commit is contained in:
Thales Maciel 2026-03-18 21:22:12 -03:00
parent a14a80fd6b
commit c8d9a122f9
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GPG key ID: 33112E6833C34679
24 changed files with 695 additions and 44 deletions
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3
AGENTS.md
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@ -10,6 +10,7 @@
## Build, Test, and Development Commands
- `make build` builds `./banger`, `./bangerd`, and the bundled `./runtime/banger-vsock-pingd` guest helper.
- `make bench-create` benchmarks `vm create` and first-SSH readiness on the current host.
- `make runtime-bundle` bootstraps `./runtime/` from the archive referenced by `RUNTIME_MANIFEST`; the checked-in `runtime-bundle.toml` is only a template.
- `banger` validates required host tools per command and reports actionable missing-tool errors; do not assume one workstation's package set.
- `./banger vm create --name testbox` creates and starts a VM.
@ -32,6 +33,8 @@
- Manual verification for VM lifecycle changes: `./banger vm create`, confirm SSH access, then stop/delete the VM.
- For host-integration changes, run `./banger doctor` as a quick readiness check before the live VM smoke.
- Rebuilt images now include `mise`, `opencode`, `tmux-resurrect`/`tmux-continuum` defaults for `root`, and the `banger-vsock-pingd` service used by the SSH reminder path; if you change guest provisioning, document whether users need to rebuild `./runtime/rootfs-docker.ext4` or another base image to pick it up.
- Rebuilt images also emit a `work-seed.ext4` sidecar used to speed up future VM creates. If you touch `/root` provisioning, verify both the rootfs and the work-seed output.
- The daemon may keep idle TAP devices in a pool for faster creates. Smoke tests should treat `tap-pool-*` devices as reusable capacity, not cleanup leaks.
- If you add a new operational workflow, document how to exercise it in `README.md`.
- For NAT changes, verify both guest outbound access and host rule cleanup, for example with `./verify.sh --nat`.