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package libpod
import (
"os"
"path/filepath"
"time"
"github.com/containers/podman/v2/libpod/define"
"github.com/containers/podman/v2/libpod/lock"
)
// Volume is a libpod named volume.
// Named volumes may be shared by multiple containers, and may be created using
// more complex options than normal bind mounts. They may be backed by a mounted
// filesystem on the host.
type Volume struct {
config *VolumeConfig
state *VolumeState
valid bool
runtime *Runtime
lock lock.Locker
}
// VolumeConfig holds the volume's immutable configuration.
type VolumeConfig struct {
// Name of the volume.
Name string `json:"name"`
// ID of the volume's lock.
LockID uint32 `json:"lockID"`
// Labels for the volume.
Labels map[string]string `json:"labels"`
// The volume driver. Empty string or local does not activate a volume
// driver, all other volumes will.
Driver string `json:"volumeDriver"`
// The location the volume is mounted at.
MountPoint string `json:"mountPoint"`
// Time the volume was created.
CreatedTime time.Time `json:"createdAt,omitempty"`
// Options to pass to the volume driver. For the local driver, this is
// a list of mount options. For other drivers, they are passed to the
// volume driver handling the volume.
Options map[string]string `json:"volumeOptions,omitempty"`
// Whether this volume is anonymous (will be removed on container exit)
IsAnon bool `json:"isAnon"`
// UID the volume will be created as.
UID int `json:"uid"`
// GID the volume will be created as.
GID int `json:"gid"`
}
// VolumeState holds the volume's mutable state.
// Volumes are not guaranteed to have a state. Only volumes using the Local
// driver that have mount options set will create a state.
type VolumeState struct {
// MountCount is the number of times this volume has been requested to
// be mounted.
// It is incremented on mount() and decremented on unmount().
// On incrementing from 0, the volume will be mounted on the host.
// On decrementing to 0, the volume will be unmounted on the host.
MountCount uint `json:"mountCount"`
// NeedsCopyUp indicates that the next time the volume is mounted into
// a container, the container will "copy up" the contents of the
// mountpoint into the volume.
// This should only be done once. As such, this is set at container
// create time, then cleared after the copy up is done and never set
// again.
NeedsCopyUp bool `json:"notYetMounted,omitempty"`
// NeedsChown indicates that the next time the volume is mounted into
// a container, the container will chown the volume to the container process
// UID/GID.
NeedsChown bool `json:"notYetChowned,omitempty"`
// UIDChowned is the UID the volume was chowned to.
UIDChowned int `json:"uidChowned,omitempty"`
// GIDChowned is the GID the volume was chowned to.
GIDChowned int `json:"gidChowned,omitempty"`
}
// Name retrieves the volume's name
func (v *Volume) Name() string {
return v.config.Name
}
// Returns the size on disk of volume
func (v *Volume) Size() (uint64, error) {
var size uint64
err := filepath.Walk(v.config.MountPoint, func(path string, info os.FileInfo, err error) error {
if err == nil && !info.IsDir() {
size += (uint64)(info.Size())
}
return err
})
return size, err
}
// Driver retrieves the volume's driver.
func (v *Volume) Driver() string {
return v.config.Driver
}
// Scope retrieves the volume's scope.
// Libpod does not implement volume scoping, and this is provided solely for
// Docker compatibility. It returns only "local".
func (v *Volume) Scope() string {
return "local"
}
// Labels returns the volume's labels
func (v *Volume) Labels() map[string]string {
labels := make(map[string]string)
for key, value := range v.config.Labels {
labels[key] = value
}
return labels
}
// MountPoint returns the volume's mountpoint on the host
func (v *Volume) MountPoint() string {
return v.config.MountPoint
}
// Options return the volume's options
func (v *Volume) Options() map[string]string {
options := make(map[string]string)
for k, v := range v.config.Options {
options[k] = v
}
return options
}
// Anonymous returns whether this volume is anonymous. Anonymous volumes were
// created with a container, and will be removed when that container is removed.
func (v *Volume) Anonymous() bool {
return v.config.IsAnon
}
// UID returns the UID the volume will be created as.
func (v *Volume) UID() (int, error) {
v.lock.Lock()
defer v.lock.Unlock()
if !v.valid {
return -1, define.ErrVolumeRemoved
}
if v.state.UIDChowned > 0 {
return v.state.UIDChowned, nil
}
return v.config.UID, nil
}
// GID returns the GID the volume will be created as.
func (v *Volume) GID() (int, error) {
v.lock.Lock()
defer v.lock.Unlock()
if !v.valid {
return -1, define.ErrVolumeRemoved
}
if v.state.GIDChowned > 0 {
return v.state.GIDChowned, nil
}
return v.config.GID, nil
}
// CreatedTime returns the time the volume was created at. It was not tracked
// for some time, so older volumes may not contain one.
func (v *Volume) CreatedTime() time.Time {
return v.config.CreatedTime
}
// Config returns the volume's configuration.
func (v *Volume) Config() (*VolumeConfig, error) {
config := VolumeConfig{}
err := JSONDeepCopy(v.config, &config)
return &config, err
}
// VolumeInUse goes through the container dependencies of a volume
// and checks if the volume is being used by any container.
func (v *Volume) VolumeInUse() ([]string, error) {
v.lock.Lock()
defer v.lock.Unlock()
if !v.valid {
return nil, define.ErrVolumeRemoved
}
return v.runtime.state.VolumeInUse(v)
}
// IsDangling returns whether this volume is dangling (unused by any
// containers).
func (v *Volume) IsDangling() (bool, error) {
ctrs, err := v.VolumeInUse()
if err != nil {
return false, err
}
return len(ctrs) == 0, nil
}
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