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solstice-ci/docs/ai/2025-11-01-vm-build-scripts.md
Till Wegmueller 0b54881558
Add support for multi-OS VM builds with cross-built runners and improved local development tooling 
This commit introduces:
- Flexible runner URL configuration via `SOLSTICE_RUNNER_URL(S)` for cloud-init.
- Automated detection of OS-specific runner binaries during VM boot.
- Tasks for cross-building, serving, and orchestrating Solstice runners.
- End-to-end VM build flows for Linux and Illumos environments.
- Enhanced orchestration with multi-runner HTTP serving and log streaming.
2025-11-01 14:31:48 +01:00

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VM build scripts and cross-built runner serving

Summary

  • Added mise tasks to cross-build the workflow runner and run builds inside both Linux and Illumos VMs.
  • Enhanced orchestrator cloud-init to support multiple runner URLs (SOLSTICE_RUNNER_URLS) and auto-pick by OS.

New tasks

  • build:runner-cross — cross builds workflow-runner for:
    • x86_64-unknown-linux-gnu (release)
    • x86_64-unknown-illumos (release)
  • run:runner-serve-multi — serves both binaries via simple HTTP servers:
  • ci:vm-build — end-to-end:
    • Brings up RabbitMQ
    • Cross-builds the runner
    • Serves both binaries and exports SOLSTICE_RUNNER_URLS
    • Starts the orchestrator with ORCH_CONTACT_ADDR set so VMs can stream logs back
    • Enqueues two jobs for this repo/commit: ubuntu-22.04 and illumos-latest
    • Tails logs briefly and cleans up

Guest job script

  • Added .solstice/job.sh (executed by the runner in the VM) to:
    • Best-effort install basic toolchain (curl/git/protoc/Rust) depending on OS
    • Build the workflow-runner crate (release preferred)
    • Avoids full workspace build to sidestep known sea-orm-cli issues during development

Usage

  • End-to-end run across both VMs:
    • mise run ci:vm-build
  • Individual steps:
    • mise run build:runner-cross
    • mise run run:runner-serve-multi
    • mise run run:orchestrator (in another terminal)
    • SOL_RUNS_ON=ubuntu-22.04 mise run run:forge-enqueue
    • SOL_RUNS_ON=illumos-latest mise run run:forge-enqueue

Notes

  • Ensure the example orchestrator image map is configured and images are accessible. Ubuntu entry is provided; illumos points to OpenIndiana Hipster cloud image.
  • The runner uses system git and /bin/sh in the VM; ensure they exist in the base images.
  • Known: a transitive sea-orm-cli build failure can break full workspace builds; tasks avoid building that crate for the fast loop.