Automating the root filesystem creation

[bxffour]

So, I have started looking into how we can automate the root filesystem creation and as of now I am going through the go-containerregistry to see how we go about it. But right now, these are the features we should be looking to implement:

1. Pulling the image layers
2. Unpacking the image layers
3. Caching container images just so we don't pull images unnecessarily

[bxffour]

Can you try this out to see how caching works @Joe-Degs

package main

import (
	"log"
	"strings"

	"github.com/google/go-containerregistry/pkg/crane"
	"github.com/google/go-containerregistry/pkg/v1/cache"
)

func main() {
	img, err := crane.Pull("alpine:latest")
	if err != nil {
		log.Fatal(err)
	}

	ca := cache.NewFilesystemCache("./save/")

	cimg := cache.Image(img, ca)

	digest, _ := cimg.Digest()
	ds := strings.Split(digest.String(), ":")

	if err := crane.Save(cimg, "latest", ds[1]); err != nil {
		log.Fatal(err)
	}
}