/
nfs.go
107 lines (100 loc) · 2.24 KB
/
nfs.go
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package addons
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"github.com/elotl/itzo-launcher/pkg/mount"
"k8s.io/klog"
)
var (
ImageDir = "/tmp/tosi"
ImageSubDirs = [2]string{"layers", "overlays"}
)
type NFSAddon struct {
mounter mount.Mounter
endpoint string
}
func init() {
Registry["nfs"] = &NFSAddon{
mounter: mount.NewOSMounter(),
}
}
func (n *NFSAddon) createLinks(mountDir string) error {
klog.V(5).Infof("mount dir %s, %d subdirs", mountDir, len(ImageSubDirs))
for _, subdir := range ImageSubDirs {
klog.V(5).Infof("checking subdir %s", subdir)
dest := filepath.Join(ImageDir, subdir)
err := os.MkdirAll(dest, 0755)
if err != nil {
return nil
}
src := filepath.Join(mountDir, subdir)
err = os.MkdirAll(src, 0755)
if err != nil {
return nil
}
klog.V(5).Infof("subdir %s -> %s", src, dest)
fis, err := ioutil.ReadDir(src)
if err != nil {
return nil
}
for _, fi := range fis {
name := fi.Name()
klog.V(5).Infof("found %s in %s", name, subdir)
if len(name) > 0 && name[0] == '.' {
continue
}
oldName := filepath.Join(src, name)
newName := filepath.Join(dest, name)
klog.V(5).Infof("linking %s -> %s", oldName, newName)
err = os.Symlink(oldName, newName)
if err != nil {
return err
}
}
}
return nil
}
func (n *NFSAddon) Run(config map[string]string) error {
endpoint := ""
mountDir := "/nfs"
mountOpts := "-o ro"
for k, v := range config {
if k == "imageCacheEndpoint" {
endpoint = v
} else if k == "imageCacheMountDir" {
mountDir = v
} else if k == "imageCacheMountOpts" {
mountOpts = v
}
}
if endpoint == "" {
return nil
}
mounts, err := n.mounter.Mounts()
if err != nil {
return fmt.Errorf("listing mounts: %v", err)
}
for _, m := range mounts {
if m.Device == endpoint {
klog.V(2).Infof("%+v is already mounted", m)
// Already mounted.
return nil
}
}
n.endpoint = endpoint
err = os.MkdirAll(mountDir, 0755)
if err != nil {
return fmt.Errorf("creating mountpoint %s: %v", mountDir, err)
}
err = n.mounter.Mount(endpoint, mountDir, "nfs", mountOpts)
if err != nil {
return fmt.Errorf("mounting NFS: %v", err)
}
err = n.createLinks(mountDir)
if err != nil {
return fmt.Errorf("creating links: %v", err)
}
return nil
}