watcher.ignore in opencode.json does not prevent hang in non-git dirs with large subtrees #23190

Description

OpenCode hangs silently — both TUI and opencode run CLI — when launched from a non-git directory that contains a large subtree (e.g. ML dataset, millions of files). The documented watcher.ignore config option does not prevent the hang. Only an actual .gitignore inside a real .git repo avoids it.

Reproduction

Fresh directory with a large data subtree, no git repo:

mkdir /tmp/oc-repro && cd /tmp/oc-repro
# (populate /tmp/oc-repro/data/ with a lot of files, e.g. an ML dataset —
# in my case ~millions of files in data/ under /media/ffarhat/data01/drafter-test)

~/.config/opencode/opencode.json has:

{
  "$schema": "https://opencode.ai/config.json",
  "model": "ollama/qwen2.5-coder:7b",
  "snapshot": false,
  "watcher": {
    "ignore": [
      "node_modules/**",
      ".git/**",
      "data/**",
      "datasets/**",
      "logs/**"
    ]
  },
  "provider": { "...": "..." }
}

Then:

cd /tmp/oc-repro
opencode run -m ollama/qwen2.5-coder:7b "Reply: OK"

Expected: OK within a few seconds (as happens in any clean dir).

Actual: Hangs after printing > build · qwen2.5-coder:7b. No response, no error, no timeout on opencode's side — times out on mine.

State matrix

Only the .git + .gitignore combination fixes it. watcher.ignore in opencode.json appears non-functional for this purpose, or only filters events after enumeration.

Debug log from the hanging case

INFO  ... service=file.watcher directory=/media/ffarhat/data01/drafter-test init
INFO  ... service=file.watcher directory=/media/ffarhat/data01/drafter-test platform=linux backend=inotify watcher backend
INFO  ... service=provider providerID=ollama found
INFO  ... service=session.prompt status=started resolveTools
INFO  ... service=tool.registry status=completed duration=0 bash
[stops here — no further output for 30+ seconds]

Log stops mid-tool-registration, implying the watcher setup (inotify recursion?) is blocking the event loop. data/ in that tree has millions of files; inotify would need a watch per directory.

Environment

• OpenCode 1.4.10 (also reproduced on 1.4.7)
• Ubuntu 24.04.4 LTS, kernel 6.x
• Installed via official https://opencode.ai/install script
• Ollama backend, but same behavior with --pure

Workaround

Initialize a git repo in the heavy dir and add a .gitignore:

git init
printf 'data/\nlogs/\n' > .gitignore

Works immediately.

Suggested fix

Either:

1. Make watcher.ignore actually prevent inotify watches being added for matching paths (not just filter events after the fact), or
2. Document clearly that watcher.ignore does not apply to initial watch setup and a .gitignore is required, or
3. Add a hard timeout on initial watcher setup to surface the problem explicitly rather than hanging indefinitely.

Happy to test a patched build if helpful.