/
nfs.go
185 lines (150 loc) · 4.57 KB
/
nfs.go
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package drivers
import (
"fmt"
"os"
"path/filepath"
"github.com/docker/go-plugins-helpers/volume"
log "github.com/sirupsen/logrus"
)
const (
NfsOptions = "nfsopts"
DefaultNfsV3 = "port=2049,nolock,proto=tcp"
)
type nfsDriver struct {
volumeDriver
version int
nfsopts map[string]string
}
var (
EmptyMap = map[string]string{}
)
func NewNFSDriver(root string, version int, nfsopts string, mounts *MountManager) nfsDriver {
d := nfsDriver{
volumeDriver: newVolumeDriver(root, mounts),
version: version,
nfsopts: map[string]string{},
}
if len(nfsopts) > 0 {
d.nfsopts[NfsOptions] = nfsopts
}
return d
}
func (n nfsDriver) Mount(r *volume.MountRequest) (*volume.MountResponse, error) {
log.Debugf("Entering Mount: %v", r)
n.m.Lock()
defer n.m.Unlock()
resolvedName, resOpts := resolveName(r.Name)
hostdir := mountpoint(n.root, resolvedName)
source := n.fixSource(resolvedName)
// Support adhoc mounts (outside of docker volume create)
// need to adjust source for ShareOpt
if resOpts != nil {
if share, found := resOpts[ShareOpt]; found {
source = n.fixSource(share)
}
}
if n.mountm.HasMount(resolvedName) {
log.Infof("Using existing NFS volume mount: %s", hostdir)
n.mountm.Increment(resolvedName)
if err := run(fmt.Sprintf("grep -c %s /proc/mounts", hostdir)); err != nil {
log.Infof("Existing NFS volume not mounted, force remount.")
// maintain count
if n.mountm.Count(resolvedName) > 0 {
n.mountm.Decrement(resolvedName)
}
} else {
//n.mountm.Increment(resolvedName)
return &volume.MountResponse{Mountpoint: hostdir}, nil
}
}
log.Infof("Mounting NFS volume %s on %s", source, hostdir)
if err := createDest(hostdir); err != nil {
if n.mountm.Count(resolvedName) > 0 {
n.mountm.Decrement(resolvedName)
}
return nil, err
}
if n.mountm.HasMount(resolvedName) == false {
n.mountm.Create(resolvedName, hostdir, resOpts)
}
n.mountm.Add(resolvedName, hostdir)
if err := n.mountVolume(resolvedName, source, hostdir, n.version); err != nil {
n.mountm.Decrement(resolvedName)
return nil, err
}
if n.mountm.GetOption(resolvedName, ShareOpt) != "" && n.mountm.GetOptionAsBool(resolvedName, CreateOpt) {
log.Infof("Mount: Share and Create options enabled - using %s as sub-dir mount", resolvedName)
datavol := filepath.Join(hostdir, resolvedName)
if err := createDest(filepath.Join(hostdir, resolvedName)); err != nil {
n.mountm.Decrement(resolvedName)
return nil, err
}
hostdir = datavol
}
return &volume.MountResponse{Mountpoint: hostdir}, nil
}
func (n nfsDriver) Unmount(r *volume.UnmountRequest) error {
log.Debugf("Entering Unmount: %v", r)
n.m.Lock()
defer n.m.Unlock()
resolvedName, _ := resolveName(r.Name)
hostdir := mountpoint(n.root, resolvedName)
if n.mountm.HasMount(resolvedName) {
if n.mountm.Count(resolvedName) > 1 {
log.Printf("Skipping unmount for %s - in use by other containers", resolvedName)
n.mountm.Decrement(resolvedName)
return nil
}
n.mountm.Decrement(resolvedName)
}
log.Infof("Unmounting volume name %s from %s", resolvedName, hostdir)
if err := run(fmt.Sprintf("umount %s", hostdir)); err != nil {
log.Errorf("Error unmounting volume from host: %s", err.Error())
return err
}
n.mountm.DeleteIfNotManaged(resolvedName)
// Check if directory is empty. This command will return "err" if empty
if err := run(fmt.Sprintf("ls -1 %s | grep .", hostdir)); err == nil {
log.Warnf("Directory %s not empty after unmount. Skipping RemoveAll call.", hostdir)
} else {
if err := os.RemoveAll(hostdir); err != nil {
return err
}
}
return nil
}
func (n nfsDriver) fixSource(name string) string {
if n.mountm.HasOption(name, ShareOpt) {
return addShareColon(n.mountm.GetOption(name, ShareOpt))
}
return addShareColon(name)
}
func (n nfsDriver) mountVolume(name, source, dest string, version int) error {
var cmd string
options := merge(n.mountm.GetOptions(name), n.nfsopts)
opts := ""
if val, ok := options[NfsOptions]; ok {
opts = val
}
mountCmd := "mount"
if log.GetLevel() == log.DebugLevel {
mountCmd = mountCmd + " -v"
}
switch version {
case 3:
log.Debugf("Mounting with NFSv3 - src: %s, dest: %s", source, dest)
if len(opts) < 1 {
opts = DefaultNfsV3
}
cmd = fmt.Sprintf("%s -t nfs -o %s %s %s", mountCmd, opts, source, dest)
default:
log.Debugf("Mounting with NFSv4 - src: %s, dest: %s", source, dest)
if len(opts) > 0 {
cmd = fmt.Sprintf("%s -t nfs4 -o %s %s %s", mountCmd, opts, source, dest)
} else {
cmd = fmt.Sprintf("%s -t nfs4 %s %s", mountCmd, source, dest)
}
}
log.Debugf("exec: %s\n", cmd)
return run(cmd)
}