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layerfolders.go
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layerfolders.go
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package testutilities
import (
"bytes"
"encoding/json"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"testing"
)
var imageLayers map[string][]string
func init() {
imageLayers = make(map[string][]string)
}
func LayerFolders(t *testing.T, imageName string) []string {
if _, ok := imageLayers[imageName]; !ok {
imageLayers[imageName] = getLayers(t, imageName)
}
return imageLayers[imageName]
}
func getLayers(t *testing.T, imageName string) []string {
cmd := exec.Command("docker", "inspect", imageName, "-f", `"{{.GraphDriver.Data.dir}}"`)
var out bytes.Buffer
cmd.Stdout = &out
if err := cmd.Run(); err != nil {
t.Skipf("Failed to find layers for %q. Check docker images", imageName)
}
imagePath := strings.Replace(strings.TrimSpace(out.String()), `"`, ``, -1)
layers := getLayerChain(t, imagePath)
return append([]string{imagePath}, layers...)
}
func getLayerChain(t *testing.T, layerFolder string) []string {
jPath := filepath.Join(layerFolder, "layerchain.json")
content, err := ioutil.ReadFile(jPath)
if os.IsNotExist(err) {
t.Fatalf("layerchain not found")
} else if err != nil {
t.Fatalf("failed to read layerchain")
}
var layerChain []string
err = json.Unmarshal(content, &layerChain)
if err != nil {
t.Fatalf("failed to unmarshal layerchain")
}
return layerChain
}