overthinkos/versatiles

versatiles — VersaTiles CLI + tile server

Layer properties

| Property | Value | |----------|-------| | Dependencies | supervisord | | Distros | arch + fedora (binary download) | | Build deps | curl, jq (for the dynamic release-asset URL resolution) | | Ports | 8090 (versatiles serve HTTP; host-mapped to 28090) | | Service | versatiles (supervisord, restart: always) | | Tile dir | /workspace/tiles/shortbread/ (parallel to martin's /workspace/tiles/pmtiles/) |

Why binary download (not cargo install)

versatiles-rs ships pre-built linux-x86_64-gnu binaries on every release. cargo install versatiles would compile 200+ transitive crates inside the versa image — wasteful when the upstream CI already publishes a ready binary. Download pattern mirrors martin's in /ov-versa:osm-tools-layer: GitHub release API → asset URL matching versatiles-*linux*x86_64*gnu*.tar.gz → curl + tar → install -m 0755 versatiles /usr/local/bin/.

Service spec

service:
  - name: versatiles
    exec: /usr/local/bin/versatiles-wrapper.sh
    restart: always
    priority: 37

The wrapper:

#!/usr/bin/env bash
set -euo pipefail
DIR="/workspace/tiles/shortbread"
mkdir -p "$DIR"
exec /usr/local/bin/versatiles serve --port 8090 "$DIR"

Same mkdir -p defensive pattern as martin-wrapper.sh — first-deploy state has no PMTiles files yet; versatiles serve starts cleanly on an empty dir and auto-discovers files as the DAG produces them.

URL surface

versatiles serve exposes:

| URL | Purpose | |---|---| | GET / | Server root (HTML directory listing) | | GET /tiles/<source>/{z}/{x}/{y}.pbf | Vector tile fetch (the shortbread DAG outputs monaco-shortbread.pmtiles, so the source name is monaco-shortbread) | | GET /tiles/<source>/tilejson.json | TileJSON metadata | | GET /tiles/<source>/style.json | Default style (if shipped in the container) |

URL format differs from martin's /<source>/{z}/{x}/{y} (no /tiles/ prefix). The notebook's shortbread cell hardcodes the /tiles/monaco-shortbread/{z}/{x}/{y} pattern in the MapLibre style override.

Convert subcommand

versatiles convert <input> <output> infers format from extension:

# PMTiles → .versatiles
versatiles convert monaco.pmtiles monaco.versatiles
# .versatiles → PMTiles (lossless round-trip)
versatiles convert monaco.versatiles monaco-rt.pmtiles
# MBTiles → PMTiles
versatiles convert legacy.mbtiles new.pmtiles
# Directory of PNGs → .versatiles (for raster tilesets)
versatiles convert /tiles-dir/ tiles.versatiles

Tile content (MVT-PBF blobs for vector, image bytes for raster) is copied verbatim — only the container changes. Conversions involving re-encoding (PNG → WebP, etc.) are also supported via subcommand flags but not exercised by this image.

The layer's deploy-scope versatiles-convert-roundtrip eval probe runs the PMTiles → .versatiles → PMTiles round-trip on the OSM DAG's monaco.pmtiles output every time R10 runs, asserting both intermediate files are readable via versatiles probe. The notebook's dedicated versatiles convert demo cell re-runs the round-trip and renders a polars.DataFrame comparing tile counts + file sizes across all three steps for visual inspection.

Eval probes

Build-scope:

• versatiles-installed — versatiles --version exit 0
• versatiles-convert-help — versatiles convert --help exit 0 (verifies the subcommand is linked into the binary)
• versatiles-wrapper-installed — /usr/local/bin/versatiles-wrapper.sh exists with mode 0755

Deploy-scope:

• versatiles-running — supervisord service RUNNING
• versatiles-port-reachable — TCP 8090 reachable
• versatiles-http-up — GET / returns 200
• versatiles-convert-roundtrip — end-to-end PMTiles round-trip via the OSM DAG output; cleanly SKIPs when monaco.pmtiles isn't present yet (pre-DAG fresh deploy) so the probe doesn't false-fail on first-run state

CRITICAL: supervisord restart race (same as martin)

Parallel DAGs that call supervisorctl restart versatiles race exactly like the four reload_martin calls do. The shortbread DAG's reload_versatiles task uses the same proper synchronization primitives:

1. fcntl.flock("/tmp/ov-versatiles-restart.lock") — serializes the supervisorctl invocations globally.
2. TCP readiness probe (bounded 30s) — waits for port 8090 to accept connections after restart.
3. HTTP / 200 assertion — verifies the END STATE, not the supervisorctl exit code (which can be non-zero even when versatiles ends up healthy).

See /ov-versa:osm-tools-layer "CRITICAL: martin caches pmtiles file mtime at startup" — same restart-race pattern applies.

Cross-references

• /ov-versa:versa — image composing this layer
• /ov-versa:shortbread — produces the PMTiles files versatiles serves
• /ov-versa:versatiles-style — MapLibre style generator paired with versatiles serve as tile backend
• /ov-versa:versatiles-frontend — pre-built SPA on port 28002 for visually exploring tile content
• /ov-versa:osm-tools-layer — sibling martin tile server (port 23000); the two run in parallel for the comparison surface
• /ov-versa:notebook-osm — the versatiles convert round-trip demo cell + the shortbread MapLibre cell