1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
// +build linux
package libpod
import (
"context"
"os"
"path/filepath"
"strings"
"time"
"github.com/containers/libpod/libpod/define"
"github.com/containers/libpod/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, err := newVolume(r)
if err != nil {
return nil, errors.Wrapf(err, "error creating volume")
}
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
}
|
