| package hcsshim |
| |
| import ( |
| "fmt" |
| "syscall" |
| "unsafe" |
| |
| "github.com/Sirupsen/logrus" |
| ) |
| |
| func CreateLayer(info DriverInfo, id, parent string) error { |
| title := "hcsshim::CreateLayer " |
| logrus.Debugf(title+"Flavour %s ID %s parent %s", info.Flavour, id, parent) |
| |
| // Load the DLL and get a handle to the procedure we need |
| dll, proc, err := loadAndFind(procCreateLayer) |
| if dll != nil { |
| defer dll.Release() |
| } |
| if err != nil { |
| return err |
| } |
| |
| // Convert id to uint16 pointer for calling the procedure |
| idp, err := syscall.UTF16PtrFromString(id) |
| if err != nil { |
| err = fmt.Errorf(title+" - Failed conversion of id %s to pointer %s", id, err) |
| logrus.Error(err) |
| return err |
| } |
| |
| // Convert parent to uint16 pointer for calling the procedure |
| parentp, err := syscall.UTF16PtrFromString(parent) |
| if err != nil { |
| err = fmt.Errorf(title+" - Failed conversion of parent %s to pointer %s", parent, err) |
| logrus.Error(err) |
| return err |
| } |
| |
| // Convert info to API calling convention |
| infop, err := convertDriverInfo(info) |
| if err != nil { |
| err = fmt.Errorf(title+" - Failed conversion info struct %s", parent, err) |
| logrus.Error(err) |
| return err |
| } |
| |
| // Call the procedure itself. |
| r1, _, _ := proc.Call( |
| uintptr(unsafe.Pointer(&infop)), |
| uintptr(unsafe.Pointer(idp)), |
| uintptr(unsafe.Pointer(parentp))) |
| |
| use(unsafe.Pointer(&infop)) |
| use(unsafe.Pointer(idp)) |
| use(unsafe.Pointer(parentp)) |
| |
| if r1 != 0 { |
| err = fmt.Errorf(title+" - Win32 API call returned error r1=%d err=%s id=%s parent=%s flavour=%d", |
| r1, syscall.Errno(r1), id, parent, info.Flavour) |
| logrus.Error(err) |
| return err |
| } |
| |
| logrus.Debugf(title+" - succeeded id=%s parent=%s flavour=%d", id, parent, info.Flavour) |
| return nil |
| } |