Overlay
Overlay File System
Overlay is an easy way to implement a file system in such a way that production assets can be overridden by assets on disk.
Usage
package main
import (
"embed"
"go.jolheiser.com/overlay"
)
//go:embed assets
var assets embed.FS
func main() {
ofs, err := overlay.New("/var/lib/myapp/custom", assets)
if err != nil {
panic(err)
}
...
}
If /var/lib/myapp/custom has an assets sub-directory, this implementation works.
However, if /var/lib/myapp/custom matches the assets directory layout,
you can use WithSub like so...
package main
import (
"embed"
"go.jolheiser.com/overlay"
)
//go:embed assets
var assets embed.FS
func main() {
ofs, err := overlay.New("/var/lib/myapp/custom", assets, overlay.WithSub("assets"))
if err != nil {
panic(err)
}
...
}