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main.go
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package main
import (
"flag"
"fmt"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
"sync"
"github.com/docker/go-plugins-helpers/volume"
)
const (
sshfsId = "_sshfs"
socketAddress = "/run/docker/plugins/sshfs.sock"
)
var (
defaultDir = filepath.Join(volume.DefaultDockerRootDirectory, sshfsId)
root = flag.String("root", defaultDir, "SshFS volumes root directory")
)
type volume_name struct {
name string
connections int
}
type sshfsDriver struct {
sync.Mutex
root string
volumes map[string]*volume_name
}
func newSshfsDriver(root string) sshfsDriver {
d := sshfsDriver{
root: root,
volumes: map[string]*volume_name{},
}
return d
}
func (d sshfsDriver) Create(r volume.Request) volume.Response {
return volume.Response{}
}
func (d sshfsDriver) Remove(r volume.Request) volume.Response {
d.Lock()
defer d.Unlock()
m := d.mountpoint(r.Name)
if s, ok := d.volumes[m]; ok {
if s.connections <= 1 {
delete(d.volumes, m)
}
}
return volume.Response{}
}
func (d sshfsDriver) Path(r volume.Request) volume.Response {
return volume.Response{Mountpoint: d.mountpoint(r.Name)}
}
func (d sshfsDriver) Mount(r volume.Request) volume.Response {
d.Lock()
defer d.Unlock()
m := d.mountpoint(r.Name)
s, ok := d.volumes[m]
if ok && s.connections > 0 {
log.Printf("Volume %s already mounted on %s\n", r.Name, m)
s.connections++
return volume.Response{Mountpoint: m}
}
fi, err := os.Lstat(m)
if os.IsNotExist(err) {
if err := os.MkdirAll(m, 0755); err != nil {
return volume.Response{Err: err.Error()}
}
} else if err != nil {
return volume.Response{Err: err.Error()}
}
if fi != nil && !fi.IsDir() {
return volume.Response{Err: fmt.Sprintf("%v already exist and it's not a directory", m)}
}
if err := d.mountVolume(r.Name, m); err != nil {
return volume.Response{Err: err.Error()}
}
d.volumes[m] = &volume_name{name: r.Name, connections: 1}
log.Printf("Mounting volume %s on %s\n", r.Name, m)
return volume.Response{Mountpoint: m}
}
func (d sshfsDriver) Unmount(r volume.Request) volume.Response {
d.Lock()
defer d.Unlock()
m := d.mountpoint(r.Name)
if s, ok := d.volumes[m]; ok {
if s.connections == 1 {
log.Printf("Unmounting volume %s from %s\n", r.Name, m)
if err := d.unmountVolume(m); err != nil {
return volume.Response{Err: err.Error()}
}
}
s.connections--
} else {
return volume.Response{Err: fmt.Sprintf("Unable to find volume mounted on %s", m)}
}
return volume.Response{}
}
func (d sshfsDriver) Get(r volume.Request) volume.Response {
d.Lock()
defer d.Unlock()
m := d.mountpoint(r.Name)
if s, ok := d.volumes[m]; ok {
return volume.Response{Volume: &volume.Volume{Name: s.name, Mountpoint: d.mountpoint(s.name)}}
}
return volume.Response{Err: fmt.Sprintf("Unable to find volume mounted on %s", m)}
}
func (d sshfsDriver) List(r volume.Request) volume.Response {
d.Lock()
defer d.Unlock()
var vols []*volume.Volume
for _, v := range d.volumes {
vols = append(vols, &volume.Volume{Name: v.name, Mountpoint: d.mountpoint(v.name)})
}
return volume.Response{Volumes: vols}
}
func (d *sshfsDriver) mountpoint(name string) string {
return filepath.Join(d.root, name)
}
func (d *sshfsDriver) mountVolume(name, destination string) error {
parts := strings.Split(name, "#")
if len(parts) == 1 {
name = name + ":/"
} else if len(parts) == 2 {
name = parts[0] + ":" + parts[1]
} else {
return fmt.Errorf("invalid name, use [user@]host#[dir]")
}
cmd := fmt.Sprintf("sshfs %s %s", name, destination)
return exec.Command("sh", "-c", cmd).Run()
}
func (d *sshfsDriver) unmountVolume(target string) error {
cmd := fmt.Sprintf("umount %s", target)
return exec.Command("sh", "-c", cmd).Run()
}
func main() {
flag.Parse()
d := newSshfsDriver(*root)
h := volume.NewHandler(d)
fmt.Printf("listening on %s\n", socketAddress)
fmt.Println(h.ServeUnix("root", socketAddress))
}