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Fix issue with cp to container volume dir

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In some cases, attempting to `docker cp` to a container's volume dir
would fail due to the volume mounts not existing after performing a
bind-mount on the container path prior to doing a pivot_root.

This does not seem to be effecting all systems, but was found to be a
problem on centos.
The solution is to use an `rbind` rather than `bind` so that any
existing mounts are carried over.

The `MakePrivate` on `path` is no longer neccessary since we are already
doing `MakeRPrivate` on `/`.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This commit is contained in:
Brian Goff 2016-11-03 15:57:38 -04:00
parent b2641bd9df
commit e6eef7eb49
1 changed files with 5 additions and 3 deletions
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8
pkg/chrootarchive/chroot_linux.go
View file

@ -30,9 +30,11 @@ func chroot(path string) (err error) {
if err := mount.MakeRPrivate("/"); err != nil {
return err
}
// ensure path is a mountpoint
if err := mount.MakePrivate(path); err != nil {
return err
if mounted, _ := mount.Mounted(path); !mounted {
if err := mount.Mount(path, path, "bind", "rbind,rw"); err != nil {
return realChroot(path)
}
}
// setup oldRoot for pivot_root