package mount // import "github.com/docker/docker/pkg/mount" /* #include #include #include #include #include #include */ import "C" import ( "fmt" "strings" "unsafe" "golang.org/x/sys/unix" ) func allocateIOVecs(options []string) []C.struct_iovec { out := make([]C.struct_iovec, len(options)) for i, option := range options { out[i].iov_base = unsafe.Pointer(C.CString(option)) out[i].iov_len = C.size_t(len(option) + 1) } return out } func mount(device, target, mType string, flag uintptr, data string) error { isNullFS := false xs := strings.Split(data, ",") for _, x := range xs { if x == "bind" { isNullFS = true } } options := []string{"fspath", target} if isNullFS { options = append(options, "fstype", "nullfs", "target", device) } else { options = append(options, "fstype", mType, "from", device) } rawOptions := allocateIOVecs(options) for _, rawOption := range rawOptions { defer C.free(rawOption.iov_base) } if errno := C.nmount(&rawOptions[0], C.uint(len(options)), C.int(flag)); errno != 0 { reason := C.GoString(C.strerror(*C.__error())) return fmt.Errorf("Failed to call nmount: %s", reason) } return nil } func unmount(target string, flag int) error { return unix.Unmount(target, flag) }