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