Look into doing an FS mixed embed/external

[kettek]

I wrote a small library some time ago that allows one to mix multiple directories into one aggregate "view", with results being an aggregate of the two, with a priority for one over the other. See https://github.com/kettek/go-multipath

However, since I wrote that, an FS interface abstraction was introduced to go. The embed fs functionality we are using adheres to this, so it may be possible to write a v2 of go-multipath that allows us to read from embed as well one or more actual system directories as if they were one.

[kettek]

I committed a v2 of multipath (though I want to rename it multifs). Supporting external files/overrides, would be something like:

import (
  "github.com/kettek/go-multipath/v2"
  "embed"
  "os"
)

//go:embed assets/*
var embedFS embed.FS

var mfs multipath.FS

func InitData() {
  mfs.AddFS(embedFS, multipath.FirstPriority)
  mfs.AddFS(os.DirFS("some_external_directory"), multipath.FirstPriority)
}

The syntax isn't set in stone, as the insert priority doesn't seem that important. Maybe have an AddFS(FS), then InsertFS for specific insertion.