---
type: tasks
after:
  - ./add.md
---

A simple mechanism should be developed which "watches" a garage directory or
file for changes. This mechanism has too sides.

## Producer

When making a change to a file in garage (putting or deleting) the producer
should publish the path to that file to a bucket-specific pubsub channel on
NATS.

This only applies for file changes which are expected to have a watcher.

## Watcher

The watcher is a simple mechanism which looks like this:

```go
type Watcher interface {
    Wait(context.Context) (string, error) // returns the path to the changed file
}
```

It can be initialized with either a specific file path or a doublestar matcher.