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moby--moby/daemon/daemon_linux.go
Brian Goff 78bd17e805 Force IPC mount to unmount on daemon shutdown/init
Instead of using `MNT_DETACH` to unmount the container's mqueue/shm
mounts, force it... but only on daemon init and shutdown.

This makes sure that these IPC mounts are cleaned up even when the
daemon is killed.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
2015-10-30 15:41:48 -04:00

60 lines
1.4 KiB
Go

package daemon
import (
"bufio"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/pkg/mount"
)
// cleanupMounts umounts shm/mqueue mounts for old containers
func (daemon *Daemon) cleanupMounts() error {
logrus.Debugf("Cleaning up old shm/mqueue mounts: start.")
f, err := os.Open("/proc/self/mountinfo")
if err != nil {
return err
}
defer f.Close()
return daemon.cleanupMountsFromReader(f, mount.Unmount)
}
func (daemon *Daemon) cleanupMountsFromReader(reader io.Reader, unmount func(target string) error) error {
if daemon.repository == "" {
return nil
}
sc := bufio.NewScanner(reader)
var errors []string
for sc.Scan() {
line := sc.Text()
fields := strings.Fields(line)
if strings.HasPrefix(fields[4], daemon.repository) {
logrus.Debugf("Mount base: %v, repository %s", fields[4], daemon.repository)
mnt := fields[4]
mountBase := filepath.Base(mnt)
if mountBase == "mqueue" || mountBase == "shm" {
logrus.Debugf("Unmounting %v", mnt)
if err := unmount(mnt); err != nil {
logrus.Error(err)
errors = append(errors, err.Error())
}
}
}
}
if err := sc.Err(); err != nil {
return err
}
if len(errors) > 0 {
return fmt.Errorf("Error cleaningup mounts:\n%v", strings.Join(errors, "\n"))
}
logrus.Debugf("Cleaning up old shm/mqueue mounts: done.")
return nil
}