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pkg/mount: add MakeMount()

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This function ensures the argument is the mount point
(i.e. if it's not, it bind mounts it to itself).

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This commit is contained in:
Kir Kolyshkin 2018-10-11 23:22:11 -07:00
parent f01297d1ae
commit 8abadb36fa
1 changed files with 13 additions and 6 deletions
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19
pkg/mount/sharedsubtree_linux.go
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@ -48,16 +48,23 @@ func MakeRUnbindable(mountPoint string) error {
return ensureMountedAs(mountPoint, "runbindable")
}
func ensureMountedAs(mountPoint, options string) error {
mounted, err := Mounted(mountPoint)
// MakeMount ensures that the file or directory given is a mount point,
// bind mounting it to itself it case it is not.
func MakeMount(mnt string) error {
mounted, err := Mounted(mnt)
if err != nil {
return err
}
if mounted {
return nil
}
if !mounted {
if err := Mount(mountPoint, mountPoint, "none", "bind"); err != nil {
return err
}
return Mount(mnt, mnt, "none", "bind")
}
func ensureMountedAs(mountPoint, options string) error {
if err := MakeMount(mountPoint); err != nil {
return err
}
return ForceMount("", mountPoint, "none", options)