func exportChanges(rootfs string, diff []byte) (archive.Archive, error) {
var changes []archive.Change
scanner := bufio.NewScanner(bytes.NewReader(diff))
for scanner.Scan() {
line := scanner.Text()
dType := strings.SplitN(line, "\t", 2)[0]
path := "/" + strings.SplitN(line, "\t", 2)[1] // important to consider the / for ExportChanges
change := archive.Change{Path: path}
switch dType {
case DIFF_MODIFIED:
change.Kind = archive.ChangeModify
case DIFF_ADDED:
change.Kind = archive.ChangeAdd
case DIFF_DELETED:
change.Kind = archive.ChangeDelete
}
changes = append(changes, change)
if err := scanner.Err(); err != nil {
return nil, err
}
}
if len(changes) == 0 {
return nil, ErrNoChange
}
return archive.ExportChanges(rootfs, changes)
}
func changeManyFiles(drv graphdriver.Driver, layer string, count int, seed int64) ([]archive.Change, error) {
root, err := drv.Get(layer, "")
if err != nil {
return nil, err
}
defer drv.Put(layer)
changes := []archive.Change{}
for i := 0; i < count; i += 100 {
archiveRoot := fmt.Sprintf("/directory-%d", i)
if err := os.MkdirAll(path.Join(root, archiveRoot), 0755); err != nil {
return nil, err
}
for j := 0; i+j < count && j < 100; j++ {
if j == 0 {
changes = append(changes, archive.Change{
Path: archiveRoot,
Kind: archive.ChangeModify,
})
}
var change archive.Change
switch j % 3 {
// Update file
case 0:
change.Path = path.Join(archiveRoot, fmt.Sprintf("file-%d", i+j))
change.Kind = archive.ChangeModify
if err := ioutil.WriteFile(path.Join(root, change.Path), randomContent(64, seed+int64(i+j)), 0755); err != nil {
return nil, err
}
// Add file
case 1:
change.Path = path.Join(archiveRoot, fmt.Sprintf("file-%d-%d", seed, i+j))
change.Kind = archive.ChangeAdd
if err := ioutil.WriteFile(path.Join(root, change.Path), randomContent(64, seed+int64(i+j)), 0755); err != nil {
return nil, err
}
// Remove file
case 2:
change.Path = path.Join(archiveRoot, fmt.Sprintf("file-%d", i+j))
change.Kind = archive.ChangeDelete
if err := os.Remove(path.Join(root, change.Path)); err != nil {
return nil, err
}
}
changes = append(changes, change)
}
}
return changes, nil
}