flywheel-bootstrap 0.1.9.202602081327

Bootstrap runner for Flywheel provisioned GPU instances

Bootstrap

This package hosts the BYOC bootstrapper that:

• Ensures Codex is available (prefers release tarball; skips install if already on PATH).
• Fetches the bootstrap payload for a run from the Flywheel backend.
• Launches codex exec with the provided prompt/config and streams logs.
• Collects artifacts (manifest-on-exit) and reports completion or error back to the backend.

Configuration

Bootstrap reads the user's Codex config.toml (Codex schema). See:

• Codex config basics: https://developers.openai.com/codex/config-basic
• Codex config reference: https://developers.openai.com/codex/config-reference

Flywheel adds a small extension under [flywheel] and requires one of:

[flywheel]
# inline instructions (host-specific tips, paths, sandbox notes)
workspace_instructions = """
Use /mnt/work as your workspace. Write artifacts under ./artifacts.
"""

# or: reference a file (relative paths are resolved against the config file directory)
workspace_instructions_file = "workspace_notes.md"

Rules:

• At least one of workspace_instructions or workspace_instructions_file is required; otherwise bootstrap exits before contacting the server.
• If both are set, the file wins and the inline value is ignored (warns once).
• File contents must be non-empty; the path is resolved relative to the config file if not absolute.

Bootstrap also reads a few optional Codex config fields because they affect workspace + sandbox behavior:

• cd / workspace_dir (run working directory; defaults to ~/.flywheel/runs/<run_id>)
• sandbox_mode and [sandbox_workspace_write].writable_roots

Prompt assembly written to flywheel_prompt.txt:

1. Flywheel engineer context (logging/artifact expectations).
2. Task Description (prompt fetched from the server).
3. Workspace Instructions (resolved from config as above).

Full example config (recommended starting point):

• https://github.com/paradigma-inc/paradigma/blob/main/project/bootstrap/examples/config.example.toml

Update the paths and instructions for your machine.

End-to-end flow (bootstrap.sh → Python bootstrapper)

1. User runs the bootstrapper on their BYOC machine:

   BOOTSTRAP_PACKAGE="${FLYWHEEL_BOOTSTRAP_PACKAGE:-flywheel-bootstrap}"
   uvx --no-cache --from "$BOOTSTRAP_PACKAGE" flywheel-bootstrap \
     --run-id <id> --token <token> --config /path/to/config.toml [--server <url>]
   

   Optional: if you have this repo checked out, you can run project/bootstrap/bootstrap.sh, which installs uvx if missing and then runs the same command. It defaults FLYWHEEL_BOOTSTRAP_PACKAGE to the local project/bootstrap path.

2. Python entrypoint (python -m bootstrap):

   • Parses args/env: requires run id + token, required --config, optional --server (default http://localhost:8000).
   • Loads Codex config.toml, enforces presence of workspace instructions (inline or file), extracts workspace/sandbox settings.

3. Workspace resolution:

   • Uses cd/workspace_dir from config if set; otherwise ~/.flywheel/runs/<run_id>.
   • Creates the workspace and validates the artifact manifest path is inside sandbox writable_roots when sandboxing is enabled; else exits with an error.

4. Codex availability:

   • If BOOTSTRAP_MOCK_CODEX is set, skips install and runs a mock flow.
   • Else, if codex is already on PATH, reuse it; otherwise download the Codex release tarball to the workspace/run root and mark it executable.

5. Fetch bootstrap payload:

   • GET <server>/runs/<run_id>/bootstrap with X-Run-Token; payload contains the task prompt.

6. Build prompt file:

   • Combine base Flywheel engineer context, “Task Description” (server prompt), and “Workspace Instructions” (user config) into flywheel_prompt.txt in the workspace.

7. Launch Codex:

   • Run codex exec --json --cd <workspace> --skip-git-repo-check flywheel_prompt.txt with env FLYWHEEL_RUN_ID/TOKEN/SERVER.
   • Start a heartbeat thread posting /runs/{id}/heartbeat every 30s.
   • Stream Codex stdout lines as logs to /runs/{id}/logs; capture Codex run_id if emitted.
   • Oversized log messages are dropped and replaced with a placeholder entry; if a proxy returns 413, the bootstrap treats it as non-fatal and emits the placeholder.

8. After Codex exits:

   • If code persistence is enabled, bootstrap commits/pushes non-artifact changes:
     • Excludes manifest-declared artifact paths from the git commit
     • Skips oversized files (default cap: 95 MiB, configurable via FLYWHEEL_GIT_MAX_COMMIT_FILE_SIZE_BYTES)
   • Artifact files referenced by payload.path/payload.file are embedded into artifact payloads when they are below the transfer threshold (default: 16 MiB, configurable via FLYWHEEL_ARTIFACT_BLOB_THRESHOLD_BYTES).
   • Read flywheel_artifacts.json; if empty and Codex run_id is known, attempt one codex resume <id> then re-read.
   • POST artifacts to /runs/{id}/artifacts; POST /complete on exit 0, else /error with the exit code.
   • Stop/join the heartbeat thread.

9. Mock mode (BOOTSTRAP_MOCK_CODEX=1):

   • Sends a heartbeat, a few logs, writes a mock artifact manifest, returns 0 (used in e2e tests).

Next steps

• Iterate on prompts / general polish.