Switch to go mod

vendor/github.com/mudler/docker-companion/api/export.go

@@ -0,0 +1,94 @@
+package api
+
+// This part is an extract from https://github.com/jwilder/docker-squash/
+
+import (
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+
+	jww "github.com/spf13/jwalterweatherman"
+)
+
+type Export struct {
+	Entries map[string]*ExportedImage
+	Path    string
+}
+
+func (e *Export) ExtractLayers(unpackmode string) error {
+
+	jww.INFO.Println("Extracting layers...")
+
+	for _, entry := range e.Entries {
+		jww.INFO.Println("  - ", entry.LayerTarPath)
+		err := entry.ExtractLayerDir(unpackmode)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (e *Export) UnPackLayers(order []string, layerDir string, unpackmode string) error {
+	err := os.MkdirAll(layerDir, 0755)
+	if err != nil {
+		return err
+	}
+
+	for _, ee := range order {
+		entry := e.Entries[ee]
+		if _, err := os.Stat(entry.LayerTarPath); os.IsNotExist(err) {
+			continue
+		}
+
+		err := ExtractLayer(&ExtractOpts{
+			Source:       entry.LayerTarPath,
+			Destination:  layerDir,
+			Compressed:   true,
+			KeepDirlinks: true,
+			Rootless:     false,
+			UnpackMode:   unpackmode})
+		if err != nil {
+			jww.INFO.Println(err.Error())
+			return err
+		}
+
+		jww.INFO.Println("  -  Deleting whiteouts for layer " + ee)
+		err = e.deleteWhiteouts(layerDir)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+const TarCmd = "tar"
+
+func (e *Export) deleteWhiteouts(location string) error {
+	return filepath.Walk(location, func(p string, info os.FileInfo, err error) error {
+		if err != nil && !os.IsNotExist(err) {
+			return err
+		}
+
+		if info == nil {
+			return nil
+		}
+
+		name := info.Name()
+		parent := filepath.Dir(p)
+		// if start with whiteout
+		if strings.Index(name, ".wh.") == 0 {
+			deletedFile := path.Join(parent, name[len(".wh."):len(name)])
+			// remove deleted files
+			if err := os.RemoveAll(deletedFile); err != nil {
+				return err
+			}
+			// remove the whiteout itself
+			if err := os.RemoveAll(p); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+}