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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
})
}
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