62 lines
1.1 KiB
Go
62 lines
1.1 KiB
Go
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"context"
|
||
|
|
"github.com/google/go-containerregistry/pkg/name"
|
||
|
|
"github.com/google/go-containerregistry/pkg/v1/remote"
|
||
|
|
"io"
|
||
|
|
"log"
|
||
|
|
"os/signal"
|
||
|
|
"syscall"
|
||
|
|
)
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
ctx, cancel := signal.NotifyContext(context.Background(), syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
|
||
|
|
defer cancel()
|
||
|
|
|
||
|
|
puller, err := remote.NewPuller()
|
||
|
|
if err != nil {
|
||
|
|
log.Panic(1, err)
|
||
|
|
}
|
||
|
|
|
||
|
|
//imageName := "loveuer/hello:v2.0.1"
|
||
|
|
imageName := "alpine:latest"
|
||
|
|
tn, err := name.NewTag(imageName)
|
||
|
|
if err != nil {
|
||
|
|
log.Panic(2, err)
|
||
|
|
}
|
||
|
|
|
||
|
|
des, err := puller.Get(ctx, tn)
|
||
|
|
if err != nil {
|
||
|
|
log.Panic(3, err)
|
||
|
|
}
|
||
|
|
|
||
|
|
img, err := des.Image()
|
||
|
|
if err != nil {
|
||
|
|
log.Panic(4, err)
|
||
|
|
}
|
||
|
|
|
||
|
|
lys, err := img.Layers()
|
||
|
|
if err != nil {
|
||
|
|
log.Panic(5, err)
|
||
|
|
}
|
||
|
|
|
||
|
|
rs := make([]io.Reader, 0)
|
||
|
|
for _, item := range lys {
|
||
|
|
r, err := item.Uncompressed()
|
||
|
|
if err != nil {
|
||
|
|
log.Panic(6, err)
|
||
|
|
}
|
||
|
|
|
||
|
|
rs = append(rs, r)
|
||
|
|
}
|
||
|
|
|
||
|
|
allr := io.MultiReader(rs...)
|
||
|
|
bs, err := io.ReadAll(allr)
|
||
|
|
if err != nil {
|
||
|
|
log.Panic(7, err)
|
||
|
|
}
|
||
|
|
|
||
|
|
log.Printf("size: %.2f MB", float64(len(bs))/1024/1024)
|
||
|
|
}
|