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// +build linux
package libpod
import (
"context"
"os"
"path/filepath"
"strings"
"time"
"github.com/containers/podman/v2/libpod/define"
"github.com/containers/podman/v2/libpod/events"
"github.com/containers/storage/pkg/stringid"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// NewVolume creates a new empty volume
func (r *Runtime) NewVolume(ctx context.Context, options ...VolumeCreateOption) (*Volume, error) {
r.lock.Lock()
defer r.lock.Unlock()
if !r.valid {
return nil, define.ErrRuntimeStopped
}
return r.newVolume(ctx, options...)
}
// newVolume creates a new empty volume
func (r *Runtime) newVolume(ctx context.Context, options ...VolumeCreateOption) (_ *Volume, deferredErr error) {
volume := newVolume(r)
for _, option := range options {
if err := option(volume); err != nil {
return nil, errors.Wrapf(err, "error running volume create option")
}
}
if volume.config.Name == "" {
volume.config.Name = stringid.GenerateNonCryptoID()
}
if volume.config.Driver == "" {
volume.config.Driver = define.VolumeDriverLocal
}
volume.config.CreatedTime = time.Now()
// Check if volume with given name exists.
exists, err := r.state.HasVolume(volume.config.Name)
if err != nil {
return nil, errors.Wrapf(err, "error checking if volume with name %s exists", volume.config.Name)
}
if exists {
return nil, errors.Wrapf(define.ErrVolumeExists, "volume with name %s already exists", volume.config.Name)
}
if volume.config.Driver == define.VolumeDriverLocal {
logrus.Debugf("Validating options for local driver")
// Validate options
for key := range volume.config.Options {
switch key {
case "device", "o", "type":
// Do nothing, valid keys
default:
return nil, errors.Wrapf(define.ErrInvalidArg, "invalid mount option %s for driver 'local'", key)
}
}
}
// Create the mountpoint of this volume
volPathRoot := filepath.Join(r.config.Engine.VolumePath, volume.config.Name)
if err := os.MkdirAll(volPathRoot, 0700); err != nil {
return nil, errors.Wrapf(err, "error creating volume directory %q", volPathRoot)
}
if err := os.Chown(volPathRoot, volume.config.UID, volume.config.GID); err != nil {
return nil, errors.Wrapf(err, "error chowning volume directory %q to %d:%d", volPathRoot, volume.config.UID, volume.config.GID)
}
fullVolPath := filepath.Join(volPathRoot, "_data")
if err := os.Mkdir(fullVolPath, 0755); err != nil {
return nil, errors.Wrapf(err, "error creating volume directory %q", fullVolPath)
}
if err := os.Chown(fullVolPath, volume.config.UID, volume.config.GID); err != nil {
return nil, errors.Wrapf(err, "error chowning volume directory %q to %d:%d", fullVolPath, volume.config.UID, volume.config.GID)
}
if err := LabelVolumePath(fullVolPath); err != nil {
return nil, err
}
volume.config.MountPoint = fullVolPath
lock, err := r.lockManager.AllocateLock()
if err != nil {
return nil, errors.Wrapf(err, "error allocating lock for new volume")
}
volume.lock = lock
volume.config.LockID = volume.lock.ID()
defer func() {
if deferredErr != nil {
if err := volume.lock.Free(); err != nil {
logrus.Errorf("Error freeing volume lock after failed creation: %v", err)
}
}
}()
volume.valid = true
// Add the volume to state
if err := r.state.AddVolume(volume); err != nil {
return nil, errors.Wrapf(err, "error adding volume to state")
}
defer volume.newVolumeEvent(events.Create)
return volume, nil
}
// removeVolume removes the specified volume from state as well tears down its mountpoint and storage
func (r *Runtime) removeVolume(ctx context.Context, v *Volume, force bool) error {
if !v.valid {
if ok, _ := r.state.HasVolume(v.Name()); !ok {
return nil
}
return define.ErrVolumeRemoved
}
v.lock.Lock()
defer v.lock.Unlock()
// Update volume status to pick up a potential removal from state
if err := v.update(); err != nil {
return err
}
deps, err := r.state.VolumeInUse(v)
if err != nil {
return err
}
if len(deps) != 0 {
depsStr := strings.Join(deps, ", ")
if !force {
return errors.Wrapf(define.ErrVolumeBeingUsed, "volume %s is being used by the following container(s): %s", v.Name(), depsStr)
}
// We need to remove all containers using the volume
for _, dep := range deps {
ctr, err := r.state.Container(dep)
if err != nil {
// If the container's removed, no point in
// erroring.
if errors.Cause(err) == define.ErrNoSuchCtr || errors.Cause(err) == define.ErrCtrRemoved {
continue
}
return errors.Wrapf(err, "error removing container %s that depends on volume %s", dep, v.Name())
}
logrus.Debugf("Removing container %s (depends on volume %q)", ctr.ID(), v.Name())
// TODO: do we want to set force here when removing
// containers?
// I'm inclined to say no, in case someone accidentally
// wipes a container they're using...
if err := r.removeContainer(ctx, ctr, false, false, false); err != nil {
return errors.Wrapf(err, "error removing container %s that depends on volume %s", ctr.ID(), v.Name())
}
}
}
// If the volume is still mounted - force unmount it
if err := v.unmount(true); err != nil {
if force {
// If force is set, evict the volume, even if errors
// occur. Otherwise we'll never be able to get rid of
// them.
logrus.Errorf("Error unmounting volume %s: %v", v.Name(), err)
} else {
return errors.Wrapf(err, "error unmounting volume %s", v.Name())
}
}
// Set volume as invalid so it can no longer be used
v.valid = false
// Remove the volume from the state
if err := r.state.RemoveVolume(v); err != nil {
return errors.Wrapf(err, "error removing volume %s", v.Name())
}
var removalErr error
// Free the volume's lock
if err := v.lock.Free(); err != nil {
removalErr = errors.Wrapf(err, "error freeing lock for volume %s", v.Name())
}
// Delete the mountpoint path of the volume, that is delete the volume
// from /var/lib/containers/storage/volumes
if err := v.teardownStorage(); err != nil {
if removalErr == nil {
removalErr = errors.Wrapf(err, "error cleaning up volume storage for %q", v.Name())
} else {
logrus.Errorf("error cleaning up volume storage for volume %q: %v", v.Name(), err)
}
}
defer v.newVolumeEvent(events.Remove)
logrus.Debugf("Removed volume %s", v.Name())
return removalErr
}
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