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package main
import (
"flag"
"fmt"
"github.com/dotcloud/docker/graphdriver/devmapper"
"os"
"path"
"sort"
"strconv"
"strings"
)
func usage() {
fmt.Fprintf(os.Stderr, "Usage: %s <flags> [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
}
|
