-
Notifications
You must be signed in to change notification settings - Fork 0
/
volumes_unix.go
161 lines (147 loc) · 5.1 KB
/
volumes_unix.go
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
// +build !windows
package daemon // import "github.com/docker/docker/daemon"
import (
"fmt"
"os"
"sort"
"strconv"
"strings"
mounttypes "github.com/docker/docker/api/types/mount"
"github.com/docker/docker/container"
"github.com/docker/docker/pkg/fileutils"
volumemounts "github.com/docker/docker/volume/mounts"
"github.com/moby/sys/mount"
)
// setupMounts iterates through each of the mount points for a container and
// calls Setup() on each. It also looks to see if is a network mount such as
// /etc/resolv.conf, and if it is not, appends it to the array of mounts.
func (daemon *Daemon) setupMounts(c *container.Container) ([]container.Mount, error) {
var mounts []container.Mount
// TODO: tmpfs mounts should be part of Mountpoints
tmpfsMounts := make(map[string]bool)
tmpfsMountInfo, err := c.TmpfsMounts()
if err != nil {
return nil, err
}
for _, m := range tmpfsMountInfo {
tmpfsMounts[m.Destination] = true
}
for _, m := range c.MountPoints {
if tmpfsMounts[m.Destination] {
continue
}
if err := daemon.lazyInitializeVolume(c.ID, m); err != nil {
return nil, err
}
// If the daemon is being shutdown, we should not let a container start if it is trying to
// mount the socket the daemon is listening on. During daemon shutdown, the socket
// (/var/run/docker.sock by default) doesn't exist anymore causing the call to m.Setup to
// create at directory instead. This in turn will prevent the daemon to restart.
checkfunc := func(m *volumemounts.MountPoint) error {
if _, exist := daemon.hosts[m.Source]; exist && daemon.IsShuttingDown() {
return fmt.Errorf("Could not mount %q to container while the daemon is shutting down", m.Source)
}
return nil
}
path, err := m.Setup(c.MountLabel, daemon.idMapping.RootPair(), checkfunc)
if err != nil {
return nil, err
}
if !c.TrySetNetworkMount(m.Destination, path) {
mnt := container.Mount{
Source: path,
Destination: m.Destination,
Writable: m.RW,
Propagation: string(m.Propagation),
}
if m.Spec.Type == mounttypes.TypeBind && m.Spec.BindOptions != nil {
mnt.NonRecursive = m.Spec.BindOptions.NonRecursive
}
if m.Volume != nil {
attributes := map[string]string{
"driver": m.Volume.DriverName(),
"container": c.ID,
"destination": m.Destination,
"read/write": strconv.FormatBool(m.RW),
"propagation": string(m.Propagation),
}
daemon.LogVolumeEvent(m.Volume.Name(), "mount", attributes)
}
mounts = append(mounts, mnt)
}
}
mounts = sortMounts(mounts)
netMounts := c.NetworkMounts()
// if we are going to mount any of the network files from container
// metadata, the ownership must be set properly for potential container
// remapped root (user namespaces)
rootIDs := daemon.idMapping.RootPair()
for _, mnt := range netMounts {
// we should only modify ownership of network files within our own container
// metadata repository. If the user specifies a mount path external, it is
// up to the user to make sure the file has proper ownership for userns
if strings.Index(mnt.Source, daemon.repository) == 0 {
if err := os.Chown(mnt.Source, rootIDs.UID, rootIDs.GID); err != nil {
return nil, err
}
}
}
return append(mounts, netMounts...), nil
}
// sortMounts sorts an array of mounts in lexicographic order. This ensure that
// when mounting, the mounts don't shadow other mounts. For example, if mounting
// /etc and /etc/resolv.conf, /etc/resolv.conf must not be mounted first.
func sortMounts(m []container.Mount) []container.Mount {
sort.Sort(mounts(m))
return m
}
// setBindModeIfNull is platform specific processing to ensure the
// shared mode is set to 'z' if it is null. This is called in the case
// of processing a named volume and not a typical bind.
func setBindModeIfNull(bind *volumemounts.MountPoint) {
if bind.Mode == "" {
bind.Mode = "z"
}
}
func (daemon *Daemon) mountVolumes(container *container.Container) error {
mounts, err := daemon.setupMounts(container)
if err != nil {
return err
}
for _, m := range mounts {
dest, err := container.GetResourcePath(m.Destination)
if err != nil {
return err
}
var stat os.FileInfo
stat, err = os.Stat(m.Source)
if err != nil {
return err
}
if err = fileutils.CreateIfNotExists(dest, stat.IsDir()); err != nil {
return err
}
bindMode := "rbind"
if m.NonRecursive {
bindMode = "bind"
}
writeMode := "ro"
if m.Writable {
writeMode = "rw"
}
// mountVolumes() seems to be called for temporary mounts
// outside the container. Soon these will be unmounted with
// lazy unmount option and given we have mounted the rbind,
// all the submounts will propagate if these are shared. If
// daemon is running in host namespace and has / as shared
// then these unmounts will propagate and unmount original
// mount as well. So make all these mounts rprivate.
// Do not use propagation property of volume as that should
// apply only when mounting happens inside the container.
opts := strings.Join([]string{bindMode, writeMode, "rprivate"}, ",")
if err := mount.Mount(m.Source, dest, "", opts); err != nil {
return err
}
}
return nil
}