# 9P files served by the `shopfs` daemon

`carts/`
	`<username>/`
		`<sku>`

`/carts/<username>/<sku>` (rw)
Creating the file `<sku>` adds a single item of `<sku>` (stock keeping
unit) to user `<username>`'s cart. The initial quantity is 1 unit.
Read returns the number of items of that type in the user's cart, in
text form (`[1-9][0-9]*`). Writing a number to the file adds or
removes the specified number of items to/from the cart
(`[+-]?[1-9][0-9]*`). Removing the file removes (all units of) the
item from the cart.

TODO: checkout