[Bug 1007677] Re: overlayfs: on-boot, mount device issue.

[Mike Mestnik]

This was a complete train wreak.  I added the 'folder' checks in to
avoid booting with an empty /usr.  Thus I believe that overlayfs grabs
the folder as-is and doesn't detect future mounted filesystems, always
using the device and inode detected at mount time...  That's an(two in
this case) empty folder.

Doing the mount this way prevents the system from booting into an
unrecoverable state.  Booting into rescue/single-user mode I was able to
correct the system.

I believe this is an issue with the boot scripts, as "mount -a" always
seams to do the correct thing.

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https://bugs.launchpad.net/bugs/1007677

Title:
  overlayfs: on-boot, mount device issue.

Status in “util-linux” package in Ubuntu:
  New

Bug description:
  Hello example fstab entries I've tested,

  overlayfs /usr overlayfs defaults,lowerdir=/.usr-ro/local/..,upperdir=/.usr-rw/lost+found/.. 0 2
  none /usr overlayfs defaults,lowerdir=/.usr-ro/local/..,upperdir=/.usr-rw/lost+found/.. 0 2

  On boot I get an error about the device overlayfs/none, so I'm
  prompted to enter maintenance mode.  I issue a "mount -a; exit;" and
  all is well the boot success.

  I'm sick of doing this.

  Here is a small script I wrote to resquash /usr, it's incomplete as
  I'm not sure how to size the lv.

  #!/bin/sh
  mksquashfs /usr /root/usr.sqfs -comp lzo -no-exports -always-use-fragments -wildcards -e local/*&
  kpid=$!

  (
  #unsquashfs -s usr.sqfs
  #lvcreate -L 5G Arcadia -n nuusr$$.ro
  cryptsetup -q luksFormat /dev/Arcadia/nuusr$$.ro /etc/keys/key.txt
  newo=$(cryptsetup luksUUID /dev/Arcadia/nuusr$$.ro)
  cryptsetup luksOpen /dev/Arcadia/nuusr$$.ro $newo --key-file /etc/keys/key.txt
  wait $kpid
  { dd if=/root/usr.sqfs bs=4k; cat /dev/urandom; } | dd bs=4M of=/dev/mapper/$newo
  cryptsetup luksClose $newo
  ) &
  opid=$!

  lvcreate -L 8G Arcadia -n nuusr$$.rw
  cryptsetup -q luksFormat /dev/Arcadia/nuusr$$.rw /etc/keys/key.txt
  neww=$(cryptsetup luksUUID /dev/Arcadia/nuusr$$.rw)
  cryptsetup luksOpen /dev/Arcadia/nuusr$$.rw $neww --key-file /etc/keys/key.txt
  mkfs.ext4 /dev/mapper/$neww
  tune2fs -e remount-ro -o journal_data_writeback,discard /dev/mapper/$neww
  cryptsetup luksClose $neww

  wait $opid
  newo=$(cryptsetup luksUUID /dev/Arcadia/nuusr$$.ro)
  oldo=$(grep fsUsr.ro /etc/crypttab | grep -o ........-....-....-....-............)
  oldw=$(grep fsUsr.rw /etc/crypttab | grep -o ........-....-....-....-............)
  sed -i -e "s/$oldo/$newo/" -e "s/$oldw/$neww/" /etc/crypttab

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: mount 2.20.1-1ubuntu3 [modified: bin/findmnt bin/mount bin/umount sbin/losetup sbin/swapon]
  ProcVersionSignature: Ubuntu 3.2.0-23.31-lowlatency-pae 3.2.14
  Uname: Linux 3.2.0-23-lowlatency-pae i686
  ApportVersion: 2.0.1-0ubuntu5
  Architecture: i386
  Date: Fri Jun  1 19:28:18 2012
  SourcePackage: util-linux
  UpgradeStatus: Upgraded to precise on 2012-01-03 (150 days ago)

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