[Bug 874774] Re: could not mount /dev/mapper/cryptswap1

[TJ]

I've been doing some local testing on the DEVLINKS patches to optimise
the iterations. I developed a user script to test the function in a
simulated environment. The script and log from my complex LVM/crypt
system are contained in the attached archive.

Please see the README in the archive for more details. Here's a summary:

I created the script to compare algorithms to eliminate unnecessary iterations of the "while read ..."
and "for link in $DEVLINKS" loops. These were brought to my attention by Steve Langasek's comments 
in Launchpad bug #874774.

The attached log-file demostrates how the current function (with bug-fix modifications by SL)
does several unnecessary iterations of entries in crypttab, and of paths in $DEVLINKS.

Specfically, search for the lines following ">>253:14 = dm-14" in test_crypt.log to compare how the
two versions of the function perform the matching and the unnecessary iterations in the original function
on my complex LVM/crypted system.

** Attachment added: "Simulation test script and log for DEVLINKS"
   https://bugs.launchpad.net/ubuntu/+source/cryptsetup/+bug/874774/+attachment/2644175/+files/test_crypt.tar.gz

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https://bugs.launchpad.net/bugs/874774

Title:
  could not mount /dev/mapper/cryptswap1

Status in “cryptsetup” package in Ubuntu:
  Triaged
Status in “cryptsetup” source package in Oneiric:
  Triaged
Status in “cryptsetup” source package in Precise:
  Triaged

Bug description:
  On multiple fresh installs since beta release 2 i have been experiencing this issue:
  during boot up, i receive the message "could not mount /dev/mapper/cryptswap1 M for manual S for skip"
  obviously I'm expecting no message to show up at all and it should boot perfectly fine. I do however believe that i have found where the problem lies, it is in /etc/fstab
  This is how the original file looked:

  # /etc/fstab: static file system information.
  #
  # Use 'blkid' to print the universally unique identifier for a
  # device; this may be used with UUID= as a more robust way to name devices
  # that works even if disks are added and removed. See fstab(5).
  #
  # <file system> <mount point>   <type>  <options>       <dump>  <pass>
  proc            /proc           proc    nodev,noexec,nosuid 0       0
  # / was on /dev/sda7 during installation
  UUID=482c5b33-9ce8-4575-b787-cddeb1e93a5e /               ext4    errors=remount-ro 0       1
  # swap was on /dev/sda8 during installation
  #UUID=eb23dadc-8e08-4769-8fc5-0b1216b67e5b none            swap    sw              0       0
  /dev/mapper/cryptswap1 none swap sw 0 0

  
  i believe the problem is that the following line of:
  #UUID=eb23dadc-8e08-4769-8fc5-0b1216b67e5b none            swap    sw              0       0

  is not supposed to be commented out, i believe this happens somewhere
  in install. The ghetto fix for this is simply to remove the comment on
  it, but it definitely should not be happening...

  i have also found a eerily similar problem from Ubuntu 9.10 Bug
  #490760  which is a "duplicate" of another bug that is why i
  classified this as cryptsetup, because that bug was.

  Here is more information:

  Description:	Ubuntu 11.10
  Release:	11.10

  cryptsetup:
    Installed: 2:1.1.3-4ubuntu2
    Candidate: 2:1.1.3-4ubuntu2
    Version table:
   *** 2:1.1.3-4ubuntu2 0
          500 http://us.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages
          100 /var/lib/dpkg/status

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