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[solved]Access aufs-rw dir after init
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dasPaul
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Joined: 14 Feb 2012
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Location: VirgoSC/LocalGroup/MilkyWay/Solarsystem/Earth/Europe/Germany/Saxony/Dresden

PostPosted: Fri May 10, 2013 10:20 am    Post subject: [solved]Access aufs-rw dir after init Reply with quote

Hi there

I made my gentoo booting into an aufs-tmpfs-mount. Here is the snipped from my
initramfs:

Code:

pre stuff ....
# Mount the root filesystem.

mkdir -p /mnt/$ROOT_P
mount -o ro /dev/$ROOT_P /mnt/$ROOT_P   ## mount the squashfsimg containing device
mkdir /mnt/tmpfs
mount -t tmpfs -o size=$ROOT_SIZE tmpfs /mnt/tmpfs    ## create the the tmpfs
cp -a /mnt/sr0/m4 /mnt/tmpfs    ## copy the squashfsimg into tmpfs

umount /dev/$ROOT_P   ## remove the device

mkdir /mnt/ro_root  ## the readonly mountpoint of the squashfsimg & aufs
mkdir -p /mnt/tmpfs/rw   ## the readwrite part of the aufs where changes are stored
mount -o ro /mnt/tmpfs/m4 /mnt/ro_root || rescue_shell   ## mount the squashfsimg to readonly
mount -t aufs -o br=/mnt/tmpfs/rw:/mnt/ro_root none /mnt/root  ## mount the final aufs to newroot
...
cleaning
switch_root...


So far this works, but after gentoo has booted I would like to access the dir containing the changes stored by aufs (should be /mnt/tmpfs/rw). But after login my mounts are only:


Code:

mount:

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 (rw,nosuid,nodev,noexec,relatime,release_agent=/lib64/rc/sh/cgroup-release-agent.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 binfmt_misc (rw,nodev,noexec,nosuid)


my /mnt dir is empty

Is there any way to access the "/mnt/tmpfs/rw" from the init?
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dasPaul
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Joined: 14 Feb 2012
Posts: 46
Location: VirgoSC/LocalGroup/MilkyWay/Solarsystem/Earth/Europe/Germany/Saxony/Dresden

PostPosted: Mon May 13, 2013 10:02 am    Post subject: Reply with quote

Solved by:

Quote:

Cc: aufs-users <aufs-users@lists.sourceforge.net>
Betreff: Re: (initramfs) How to access rw-part after switch_root ?


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
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