80aecc7014
This makes the device mapper tool work again and adds new features to get pool status, device status and to list all devices.
115 lines
2.6 KiB
Go
115 lines
2.6 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"github.com/dotcloud/docker/graphdriver/devmapper"
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"os"
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"path"
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"sort"
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)
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func usage() {
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fmt.Fprintf(os.Stderr, "Usage: %s <flags> [status] | [list] | [device id] | [snap new-id base-id] | [remove id] | [mount id mountpoint]\n", os.Args[0])
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flag.PrintDefaults()
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os.Exit(1)
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}
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func main() {
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root := flag.String("r", "/var/lib/docker", "Docker root dir")
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flDebug := flag.Bool("D", false, "Debug mode")
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flag.Parse()
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if *flDebug {
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os.Setenv("DEBUG", "1")
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}
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if flag.NArg() < 1 {
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usage()
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}
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args := flag.Args()
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home := path.Join(*root, "devicemapper")
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devices, err := devmapper.NewDeviceSet(home, false)
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if err != nil {
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fmt.Println("Can't initialize device mapper: ", err)
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os.Exit(1)
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}
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switch args[0] {
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case "status":
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status := devices.Status()
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fmt.Printf("Pool name: %s\n", status.PoolName)
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fmt.Printf("Data Loopback file: %s\n", status.DataLoopback)
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fmt.Printf("Metadata Loopback file: %s\n", status.MetadataLoopback)
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fmt.Printf("Sector size: %d\n", status.SectorSize)
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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))
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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))
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break
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case "list":
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ids := devices.List()
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sort.Strings(ids)
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for _, id := range ids {
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fmt.Println(id)
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}
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break
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case "device":
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if flag.NArg() < 2 {
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usage()
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}
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status, err := devices.GetDeviceStatus(args[1])
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if err != nil {
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fmt.Println("Can't get device info: ", err)
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os.Exit(1)
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}
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fmt.Printf("Id: %d\n", status.DeviceId)
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fmt.Printf("Size: %d\n", status.Size)
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fmt.Printf("Transaction Id: %d\n", status.TransactionId)
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fmt.Printf("Size in Sectors: %d\n", status.SizeInSectors)
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fmt.Printf("Mapped Sectors: %d\n", status.MappedSectors)
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fmt.Printf("Highest Mapped Sector: %d\n", status.HighestMappedSector)
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break
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case "snap":
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if flag.NArg() < 3 {
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usage()
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}
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err := devices.AddDevice(args[1], args[2])
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if err != nil {
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fmt.Println("Can't create snap device: ", err)
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os.Exit(1)
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}
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break
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case "remove":
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if flag.NArg() < 2 {
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usage()
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}
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err := devices.RemoveDevice(args[1])
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if err != nil {
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fmt.Println("Can't remove device: ", err)
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os.Exit(1)
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}
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break
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case "mount":
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if flag.NArg() < 3 {
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usage()
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}
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err := devices.MountDevice(args[1], args[2], false)
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if err != nil {
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fmt.Println("Can't create snap device: ", err)
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os.Exit(1)
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}
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break
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default:
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fmt.Printf("Unknown command %s\n", args[0])
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usage()
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os.Exit(1)
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}
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return
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}
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