package opts import ( "encoding/csv" "fmt" "os" "strconv" "strings" mounttypes "github.com/docker/docker/api/types/mount" "github.com/docker/go-units" ) // MountOpt is a Value type for parsing mounts type MountOpt struct { values []mounttypes.Mount } // Set a new mount value func (m *MountOpt) Set(value string) error { csvReader := csv.NewReader(strings.NewReader(value)) fields, err := csvReader.Read() if err != nil { return err } mount := mounttypes.Mount{} volumeOptions := func() *mounttypes.VolumeOptions { if mount.VolumeOptions == nil { mount.VolumeOptions = &mounttypes.VolumeOptions{ Labels: make(map[string]string), } } if mount.VolumeOptions.DriverConfig == nil { mount.VolumeOptions.DriverConfig = &mounttypes.Driver{} } return mount.VolumeOptions } bindOptions := func() *mounttypes.BindOptions { if mount.BindOptions == nil { mount.BindOptions = new(mounttypes.BindOptions) } return mount.BindOptions } tmpfsOptions := func() *mounttypes.TmpfsOptions { if mount.TmpfsOptions == nil { mount.TmpfsOptions = new(mounttypes.TmpfsOptions) } return mount.TmpfsOptions } setValueOnMap := func(target map[string]string, value string) { parts := strings.SplitN(value, "=", 2) if len(parts) == 1 { target[value] = "" } else { target[parts[0]] = parts[1] } } mount.Type = mounttypes.TypeVolume // default to volume mounts // Set writable as the default for _, field := range fields { parts := strings.SplitN(field, "=", 2) key := strings.ToLower(parts[0]) if len(parts) == 1 { switch key { case "readonly", "ro": mount.ReadOnly = true continue case "volume-nocopy": volumeOptions().NoCopy = true continue } } if len(parts) != 2 { return fmt.Errorf("invalid field '%s' must be a key=value pair", field) } value := parts[1] switch key { case "type": mount.Type = mounttypes.Type(strings.ToLower(value)) case "source", "src": mount.Source = value case "target", "dst", "destination": mount.Target = value case "readonly", "ro": mount.ReadOnly, err = strconv.ParseBool(value) if err != nil { return fmt.Errorf("invalid value for %s: %s", key, value) } case "bind-propagation": bindOptions().Propagation = mounttypes.Propagation(strings.ToLower(value)) case "volume-nocopy": volumeOptions().NoCopy, err = strconv.ParseBool(value) if err != nil { return fmt.Errorf("invalid value for populate: %s", value) } case "volume-label": setValueOnMap(volumeOptions().Labels, value) case "volume-driver": volumeOptions().DriverConfig.Name = value case "volume-opt": if volumeOptions().DriverConfig.Options == nil { volumeOptions().DriverConfig.Options = make(map[string]string) } setValueOnMap(volumeOptions().DriverConfig.Options, value) case "tmpfs-size": sizeBytes, err := units.RAMInBytes(value) if err != nil { return fmt.Errorf("invalid value for %s: %s", key, value) } tmpfsOptions().SizeBytes = sizeBytes case "tmpfs-mode": ui64, err := strconv.ParseUint(value, 8, 32) if err != nil { return fmt.Errorf("invalid value for %s: %s", key, value) } tmpfsOptions().Mode = os.FileMode(ui64) default: return fmt.Errorf("unexpected key '%s' in '%s'", key, field) } } if mount.Type == "" { return fmt.Errorf("type is required") } if mount.Target == "" { return fmt.Errorf("target is required") } if mount.VolumeOptions != nil && mount.Type != mounttypes.TypeVolume { return fmt.Errorf("cannot mix 'volume-*' options with mount type '%s'", mount.Type) } if mount.BindOptions != nil && mount.Type != mounttypes.TypeBind { return fmt.Errorf("cannot mix 'bind-*' options with mount type '%s'", mount.Type) } if mount.TmpfsOptions != nil && mount.Type != mounttypes.TypeTmpfs { return fmt.Errorf("cannot mix 'tmpfs-*' options with mount type '%s'", mount.Type) } m.values = append(m.values, mount) return nil } // Type returns the type of this option func (m *MountOpt) Type() string { return "mount" } // String returns a string repr of this option func (m *MountOpt) String() string { mounts := []string{} for _, mount := range m.values { repr := fmt.Sprintf("%s %s %s", mount.Type, mount.Source, mount.Target) mounts = append(mounts, repr) } return strings.Join(mounts, ", ") } // Value returns the mounts func (m *MountOpt) Value() []mounttypes.Mount { return m.values }