ciaranbor 15f1b61f4c Rework model storage directory management (for external storage) (#1765) ...

## Motivation

Replace confusing EXO_MODELS_DIR/EXO_MODELS_PATH with clearer
multi-directory support, enabling automatic download spillover across
volumes.

## Changes

- EXO_MODELS_DIRS: colon-separated writable dirs (default always
prepended, first with enough space wins)
- EXO_MODELS_READ_ONLY_DIRS: colon-separated read-only dirs (protected
from deletion)
- select_download_dir(): picks writable dir by free space
- resolve_existing_model(): unified lookup across all dirs
- is_read_only_model_dir(): path-based read-only detection instead of
hardcoded flag
- Updated coordinator, worker, model cards, tests

## Why It Works

Default dir always included so zero-config behavior is unchanged. Disk
space checked at download time for automatic spillover. Read-only status
derived from path, not hardcoded.

## Test Plan

### Manual Testing

- No env vars set → identical behavior
- EXO_MODELS_DIRS=/Volumes/SSD/models → downloads to external storage
- EXO_MODELS_READ_ONLY_DIRS=/mnt/nfs → models found, deletion blocked

### Automated Testing

- 4 new tests in test_xdg_paths.py (prepend, default-only, overlap,
empty read-only)
- Existing tests updated to patch new constants

2026-03-26 17:46:46 +00:00

..

auto_bench.sh

fix warmup consistency for slow machines (#1748)

2026-03-24 16:45:55 +00:00

eval_tool_calls.sh

Fix tool calling (#1529)

2026-02-18 20:29:18 +00:00

get_all_models_on_cluster.py

auto bench (#1405)

2026-02-06 15:35:46 +00:00

headless_runner.py

Rework model storage directory management (for external storage) (#1765)

2026-03-26 17:46:46 +00:00

run_exo_on.sh

fix: DeepSeek V3.2 warmup crash and tool calling + add catalog cards (#1769)

2026-03-25 16:20:35 +00:00

start_distributed_test.py

improve distributed testing (#1300)

2026-02-02 18:25:39 +00:00