mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
108 lines
3.3 KiB
Go
108 lines
3.3 KiB
Go
package mount // import "github.com/docker/docker/pkg/mount"
|
|
|
|
import (
|
|
"sort"
|
|
"strings"
|
|
|
|
"syscall"
|
|
|
|
"github.com/sirupsen/logrus"
|
|
)
|
|
|
|
// GetMounts retrieves a list of mounts for the current running process.
|
|
func GetMounts() ([]*Info, error) {
|
|
return parseMountTable()
|
|
}
|
|
|
|
// Mounted determines if a specified mountpoint has been mounted.
|
|
// On Linux it looks at /proc/self/mountinfo.
|
|
func Mounted(mountpoint string) (bool, error) {
|
|
entries, err := parseMountTable()
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
|
|
// Search the table for the mountpoint
|
|
for _, e := range entries {
|
|
if e.Mountpoint == mountpoint {
|
|
return true, nil
|
|
}
|
|
}
|
|
return false, nil
|
|
}
|
|
|
|
// Mount will mount filesystem according to the specified configuration, on the
|
|
// condition that the target path is *not* already mounted. Options must be
|
|
// specified like the mount or fstab unix commands: "opt1=val1,opt2=val2". See
|
|
// flags.go for supported option flags.
|
|
func Mount(device, target, mType, options string) error {
|
|
flag, _ := parseOptions(options)
|
|
if flag&REMOUNT != REMOUNT {
|
|
if mounted, err := Mounted(target); err != nil || mounted {
|
|
return err
|
|
}
|
|
}
|
|
return ForceMount(device, target, mType, options)
|
|
}
|
|
|
|
// ForceMount will mount a filesystem according to the specified configuration,
|
|
// *regardless* if the target path is not already mounted. Options must be
|
|
// specified like the mount or fstab unix commands: "opt1=val1,opt2=val2". See
|
|
// flags.go for supported option flags.
|
|
func ForceMount(device, target, mType, options string) error {
|
|
flag, data := parseOptions(options)
|
|
return mount(device, target, mType, uintptr(flag), data)
|
|
}
|
|
|
|
// Unmount lazily unmounts a filesystem on supported platforms, otherwise
|
|
// does a normal unmount.
|
|
func Unmount(target string) error {
|
|
if mounted, err := Mounted(target); err != nil || !mounted {
|
|
return err
|
|
}
|
|
return unmount(target, mntDetach)
|
|
}
|
|
|
|
// RecursiveUnmount unmounts the target and all mounts underneath, starting with
|
|
// the deepsest mount first.
|
|
func RecursiveUnmount(target string) error {
|
|
mounts, err := GetMounts()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Make the deepest mount be first
|
|
sort.Sort(sort.Reverse(byMountpoint(mounts)))
|
|
|
|
for i, m := range mounts {
|
|
if !strings.HasPrefix(m.Mountpoint, target) {
|
|
continue
|
|
}
|
|
logrus.Debugf("Trying to unmount %s", m.Mountpoint)
|
|
err = unmount(m.Mountpoint, mntDetach)
|
|
if err != nil {
|
|
// If the error is EINVAL either this whole package is wrong (invalid flags passed to unmount(2)) or this is
|
|
// not a mountpoint (which is ok in this case).
|
|
// Meanwhile calling `Mounted()` is very expensive.
|
|
//
|
|
// We've purposefully used `syscall.EINVAL` here instead of `unix.EINVAL` to avoid platform branching
|
|
// Since `EINVAL` is defined for both Windows and Linux in the `syscall` package (and other platforms),
|
|
// this is nicer than defining a custom value that we can refer to in each platform file.
|
|
if err == syscall.EINVAL {
|
|
continue
|
|
}
|
|
if i == len(mounts)-1 {
|
|
if mounted, e := Mounted(m.Mountpoint); e != nil || mounted {
|
|
return err
|
|
}
|
|
continue
|
|
}
|
|
// This is some submount, we can ignore this error for now, the final unmount will fail if this is a real problem
|
|
logrus.WithError(err).Warnf("Failed to unmount submount %s", m.Mountpoint)
|
|
continue
|
|
}
|
|
|
|
logrus.Debugf("Unmounted %s", m.Mountpoint)
|
|
}
|
|
return nil
|
|
}
|