k3s/pkg/rootless/mounts.go
Akihiro Suda 490d6aefe0 rootless: fix mounting /var/lib/cni
k3s was unable to start up when /var/lib/cni is missing on the host.

Fix https://github.com/rancher/k3s/issues/470

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
2019-05-29 14:04:28 +09:00

69 lines
1.5 KiB
Go

package rootless
import (
"fmt"
"os"
"path/filepath"
"strings"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
)
func setupMounts(stateDir string) error {
mountMap := [][]string{
{"/run", ""},
{"/var/run", ""},
{"/var/log", filepath.Join(stateDir, "logs")},
{"/var/lib/cni", filepath.Join(stateDir, "cni")},
}
for _, v := range mountMap {
if err := setupMount(v[0], v[1]); err != nil {
return errors.Wrapf(err, "failed to setup mount %s => %s", v[0], v[1])
}
}
return nil
}
func setupMount(target, dir string) error {
toCreate := target
for {
if toCreate == "/" {
return fmt.Errorf("missing /%s on the root filesystem", strings.Split(target, "/")[0])
}
if err := os.MkdirAll(toCreate, 0700); err == nil {
break
}
toCreate = filepath.Base(toCreate)
}
if err := os.MkdirAll(toCreate, 0700); err != nil {
return errors.Wrapf(err, "failed to create directory %s", toCreate)
}
logrus.Debug("Mounting none ", toCreate, " tmpfs")
if err := unix.Mount("none", toCreate, "tmpfs", 0, ""); err != nil {
return errors.Wrapf(err, "failed to mount tmpfs to %s", toCreate)
}
if err := os.MkdirAll(target, 0700); err != nil {
return errors.Wrapf(err, "failed to create directory %s", target)
}
if dir == "" {
return nil
}
if err := os.MkdirAll(dir, 0700); err != nil {
return errors.Wrapf(err, "failed to create directory %s", dir)
}
logrus.Debug("Mounting ", dir, target, " none bind")
return unix.Mount(dir, target, "none", unix.MS_BIND, "")
}