Bug#763932: bindmounts-on-bindmounts mounted on first bindmount device/olddir

[Gabriele Giacone <1o5g4r8o@gmail.com>]

Source: hurd
X-Debbugs-CC: debian-hurd@lists.debian.org

On Wed, Sep 3, 2014 at 1:21 PM, Gabriele Giacone <1o5g4r8o@gmail.com> wrote:
> sbuild/schroot suffer a bindmount bug we already talked about but not
> tracked yet. Briefly,
>   mount -o bind foo0 foo1
>   mount -o bind foo2 foo1/bar
> proc/mounts displays:
>   /dev/hd0s1 foo1
>   /dev/hd0s1 foo0/bar
> instead of
>   /dev/hd0s1 foo1
>   /dev/hd0s1 foo1/bar

Filing bug in question.

CHROOT_FILE_UNPACK_DIR is bindmounted on CHROOT_MOUNT_LOCATION. Hurd
also needs bindmounting /dev and /servers on respectively $C_M_L/dev
and $C_M_L/servers, but due to this bug, bindmounts-on-bindmounts
result mounted on first bindmount source device i.e.
CHROOT_FILE_UNPACK_DIR.

e.g.
 I: 10mount: settrans -a /var/lib/schroot/mount/test00 /hurd/firmlink
/srv/chroot/schroot-unpack/test00
 I: 10mount: settrans -a /srv/schroot/mount/test00/dev /hurd/firmlink /dev
 I: 10mount: settrans -a /srv/schroot/mount/test00/servers
/hurd/firmlink /servers

produces
 /dev/hd0s7 /srv/schroot/mount/test00 /hurd/ext2fs
writable,no-inherit-dir-group,sync=5 0 0
 /dev/hd0s1 /srv/chroot/schroot-unpack/test00/dev ext2fs
writable,no-inherit-dir-group,store-type=typed 0 0
 /dev/hd0s1 /srv/chroot/schroot-unpack/test00/servers ext2fs
writable,no-inherit-dir-group,store-type=typed 0 0