You should probably save it with a bind mount before cleanup:
mkdir -p /mnt/root/rw
mount -o bind /mnt/tmpfs/rw /mnt/root/rw
then after the switch-root you can look in /rw to find all the modifications
that have been made
On Mon, May 13, 2013 at 9:43 AM, <[1]pau...@gmx.net> wrote:
  Hi there
  Iam quite new to aufs but I managed to get my gentoo boot a
squashfs.img
  into aufs-ro and aufs-rw. My system boots successfuly but how can I
access
  the rw-dir I defined in the initramfs after switch_root?
  ### init #############
  ...pre-stuff
  ...
  # mount the usb with the squash.img and copy it to tmpfs
  mkdir -p /mnt/sdb1
  mount /dev/sdb1 /mnt/sdb1
  mkdir /mnt/tmpfs
  mount -t tmpfs -o size=1500m tmpfs /mnt/tmpfs
  cp -a /mnt/sdb1/squash.img /mnt/tmpfs
  umount /dev/sdb1
  # make aufs ro-rw-newroot
  mkdir /mnt/ro_root
  mkdir -p /mnt/tmpfs/rw
  mount -o ro /mnt/tmpfs/squash.img /mnt/ro_root || rescue_shell
  mount -t aufs -o br=/mnt/tmpfs/rw:/mnt/ro_root none /mnt/root
  # Clean up.
  umount /proc
  umount /sys
  umount /dev
  # Boot the real thing.
  exec switch_root /mnt/root /sbin/init || rescue_shell
  #######################
  my mount after switch_root looks like:
  ########################
  rootfs on / type rootfs (rw)
  tmpfs on /mnt/tmpfs type tmpfs (rw,relatime,size=1536000k)
  /dev/loop0 on /mnt/ro_root type squashfs (ro,relatime)
  none on / type aufs (rw,relatime,si=97dd6d33cdfc9433)
  proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
  tmpfs on /run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
  udev on /dev type devtmpfs
  (rw,nosuid,relatime,size=10240k,nr_inodes=505505,mode=755)
  devpts on /dev/pts type devpts
(rw,nosuid,noexec,relatime,gid=5,mode=620)
  shm on /dev/shm type tmpfs (rw,nosuid,nodev,noexec,relatime)
  sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
  debugfs on /sys/kernel/debug type debugfs
(rw,nosuid,nodev,noexec,relatime)
  cgroup_root on /sys/fs/cgroup type tmpfs
  (rw,nosuid,nodev,noexec,relatime,size=10240k,mode=755)
  openrc on /sys/fs/cgroup/openrc type cgroup
Â
 (rw,nosuid,nodev,noexec,relatime,release_agent=/lib64/rc/sh/cgroup-relea
se-a
  gent.sh,name=openrc)
  cpuset on /sys/fs/cgroup/cpuset type cgroup
  (rw,nosuid,nodev,noexec,relatime,cpuset)
  cpu on /sys/fs/cgroup/cpu type cgroup
(rw,nosuid,nodev,noexec,relatime,cpu)
  cpuacct     on    /sys/fs/cgroup/cpuacct    type
   cgroup
  (rw,nosuid,nodev,noexec,relatime,cpuacct)
  freezer     on    /sys/fs/cgroup/freezer    type
   cgroup
  (rw,nosuid,nodev,noexec,relatime,freezer)
  binfmt_misc   on   /proc/sys/fs/binfmt_misc   type Â
 binfmt_misc
  (rw,nodev,noexec,nosuid)
  #########################
--------------------------------------------------------------------------
----
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References
1. mailto:pau...@gmx.net
2. http://p.sf.net/sfu/neotech_d2d_may
------------------------------------------------------------------------------
Learn Graph Databases - Download FREE O'Reilly Book
"Graph Databases" is the definitive new guide to graph databases and
their applications. This 200-page book is written by three acclaimed
leaders in the field. The early access version is available now.
Download your free book today! http://p.sf.net/sfu/neotech_d2d_may
