sjansen/mecha

package main

import (
    "fmt"
    "os"

    "github.com/google/go-containerregistry/pkg/authn"
    "github.com/google/go-containerregistry/pkg/name"
    "github.com/google/go-containerregistry/pkg/v1/remote"
)

func main() {
    for _, ref := range []string{"hello-world", "postgres:14"} {
        parsed, err := name.ParseReference(ref)
        if err != nil {
            fmt.Fprintln(os.Stderr, err)
            os.Exit(1)
        }

        img, err := remote.Image(parsed, remote.WithAuthFromKeychain(authn.DefaultKeychain))
        if err != nil {
            fmt.Fprintln(os.Stderr, err)
            os.Exit(1)
        }

        digest, err := img.Digest()
        if err != nil {
            fmt.Fprintln(os.Stderr, err)
            os.Exit(1)
        }

        fmt.Println(parsed, digest)
    }
}