package main import ( "flag" "fmt" "github.com/dotcloud/docker/graphdriver/devmapper" "os" "path" "sort" "strconv" "strings" ) func usage() { fmt.Fprintf(os.Stderr, "Usage: %s [status] | [list] | [device id] | [resize new-pool-size] | [snap new-id base-id] | [remove id] | [mount id mountpoint]\n", os.Args[0]) flag.PrintDefaults() os.Exit(1) } func byteSizeFromString(arg string) (int64, error) { digits := "" rest := "" last := strings.LastIndexAny(arg, "0123456789") if last >= 0 { digits = arg[:last+1] rest = arg[last+1:] } val, err := strconv.ParseInt(digits, 10, 64) if err != nil { return val, err } rest = strings.ToLower(strings.TrimSpace(rest)) var multiplier int64 = 1 switch rest { case "": multiplier = 1 case "k", "kb": multiplier = 1024 case "m", "mb": multiplier = 1024 * 1024 case "g", "gb": multiplier = 1024 * 1024 * 1024 case "t", "tb": multiplier = 1024 * 1024 * 1024 * 1024 default: return 0, fmt.Errorf("Unknown size unit: %s", rest) } return val * multiplier, nil } func main() { root := flag.String("r", "/var/lib/docker", "Docker root dir") flDebug := flag.Bool("D", false, "Debug mode") flag.Parse() if *flDebug { os.Setenv("DEBUG", "1") } if flag.NArg() < 1 { usage() } args := flag.Args() home := path.Join(*root, "devicemapper") devices, err := devmapper.NewDeviceSet(home, false) if err != nil { fmt.Println("Can't initialize device mapper: ", err) os.Exit(1) } switch args[0] { case "status": status := devices.Status() fmt.Printf("Pool name: %s\n", status.PoolName) fmt.Printf("Data Loopback file: %s\n", status.DataLoopback) fmt.Printf("Metadata Loopback file: %s\n", status.MetadataLoopback) fmt.Printf("Sector size: %d\n", status.SectorSize) fmt.Printf("Data use: %d of %d (%.1f %%)\n", status.Data.Used, status.Data.Total, 100.0*float64(status.Data.Used)/float64(status.Data.Total)) fmt.Printf("Metadata use: %d of %d (%.1f %%)\n", status.Metadata.Used, status.Metadata.Total, 100.0*float64(status.Metadata.Used)/float64(status.Metadata.Total)) break case "list": ids := devices.List() sort.Strings(ids) for _, id := range ids { fmt.Println(id) } break case "device": if flag.NArg() < 2 { usage() } status, err := devices.GetDeviceStatus(args[1]) if err != nil { fmt.Println("Can't get device info: ", err) os.Exit(1) } fmt.Printf("Id: %d\n", status.DeviceId) fmt.Printf("Size: %d\n", status.Size) fmt.Printf("Transaction Id: %d\n", status.TransactionId) fmt.Printf("Size in Sectors: %d\n", status.SizeInSectors) fmt.Printf("Mapped Sectors: %d\n", status.MappedSectors) fmt.Printf("Highest Mapped Sector: %d\n", status.HighestMappedSector) break case "resize": if flag.NArg() < 2 { usage() } size, err := byteSizeFromString(args[1]) if err != nil { fmt.Println("Invalid size: ", err) os.Exit(1) } err = devices.ResizePool(size) if err != nil { fmt.Println("Error resizeing pool: ", err) os.Exit(1) } break case "snap": if flag.NArg() < 3 { usage() } err := devices.AddDevice(args[1], args[2]) if err != nil { fmt.Println("Can't create snap device: ", err) os.Exit(1) } break case "remove": if flag.NArg() < 2 { usage() } err := devices.RemoveDevice(args[1]) if err != nil { fmt.Println("Can't remove device: ", err) os.Exit(1) } break case "mount": if flag.NArg() < 3 { usage() } err := devices.MountDevice(args[1], args[2], false) if err != nil { fmt.Println("Can't create snap device: ", err) os.Exit(1) } break default: fmt.Printf("Unknown command %s\n", args[0]) usage() os.Exit(1) } return }