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volume.go
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volume.go
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package types
import (
"encoding/json"
"errors"
"fmt"
"net/url"
"path/filepath"
"strconv"
"strings"
)
// Volume encapsulates a volume which should be mounted into the filesystem
// of all apps in a ContainerRuntimeManifest
type Volume struct {
Name ACName `json:"name"`
Kind string `json:"kind"`
// currently used only by "host"
// TODO(jonboulle): factor out?
Source string `json:"source,omitempty"`
ReadOnly bool `json:"readOnly,omitempty"`
}
type volume Volume
func (v Volume) assertValid() error {
if v.Name.Empty() {
return errors.New("name must be set")
}
switch v.Kind {
case "empty":
if v.Source != "" {
return errors.New("source for empty volume must be empty")
}
return nil
case "host":
if v.Source == "" {
return errors.New("source for host volume cannot be empty")
}
if !filepath.IsAbs(v.Source) {
return errors.New("source for host volume must be absolute path")
}
return nil
default:
return errors.New(`unrecognized volume kind: should be one of "empty", "host"`)
}
}
func (v *Volume) UnmarshalJSON(data []byte) error {
var vv volume
if err := json.Unmarshal(data, &vv); err != nil {
return err
}
nv := Volume(vv)
if err := nv.assertValid(); err != nil {
return err
}
*v = nv
return nil
}
func (v Volume) MarshalJSON() ([]byte, error) {
if err := v.assertValid(); err != nil {
return nil, err
}
return json.Marshal(volume(v))
}
func (v Volume) String() string {
s := fmt.Sprintf("%s,kind=%s,readOnly=%t", v.Name, v.Kind, v.ReadOnly)
if v.Source != "" {
s = s + fmt.Sprintf("source=%s", v.Source)
}
return s
}
// VolumeFromString takes a command line volume parameter and returns a volume
//
// Example volume parameters:
// database,kind=host,source=/tmp,readOnly=true
func VolumeFromString(vp string) (*Volume, error) {
var vol Volume
vp = "name=" + vp
v, err := url.ParseQuery(strings.Replace(vp, ",", "&", -1))
if err != nil {
return nil, err
}
for key, val := range v {
if len(val) > 1 {
return nil, fmt.Errorf("label %s with multiple values %q", key, val)
}
// TOOD(philips): make this less hardcoded
switch key {
case "name":
acn, err := NewACName(val[0])
if err != nil {
return nil, err
}
vol.Name = *acn
case "kind":
vol.Kind = val[0]
case "source":
vol.Source = val[0]
case "readOnly":
ro, err := strconv.ParseBool(val[0])
if err != nil {
return nil, err
}
vol.ReadOnly = ro
default:
return nil, fmt.Errorf("unknown volume parameter %q", key)
}
}
err = vol.assertValid()
if err != nil {
return nil, err
}
return &vol, nil
}