[Bug 1046826] Re: cryptroot fails silently fails on error

[Michał Sawicz]

For me the problem was that crypttab didn't match fstab, update-
initramfs happily completed and the system became unbootable.

One more point of failure seems to be when the encrypted volume isn't
open, or is open under a name different than fstab/crypttab (i.e. you
wanted to rename the mapping).

** Summary changed:

- cryptroot fails silently fails if LVM fails when /run/lock is non existent
+ cryptroot fails silently fails on error

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https://bugs.launchpad.net/bugs/1046826

Title:
  cryptroot fails silently fails on error

Status in cryptsetup package in Ubuntu:
  Confirmed

Bug description:
  I just updated my machine from 11.10 to 12.04. The update itself
  failed, because update-manager didn't prevent the laptop from going
  into suspend. Anyway, I rebooted, chrooted and did dpkg --configure -a
  and apt-get dist-upgrade. All packages were fine. However, the machine
  wouldn't boot, because it couldn't find the crypto volume. Turns out,
  that conf.d/cryptroot was missing. That was because of a *silent*
  failure from the cryptroot script from initramfs-tools.

  The hook ran LVM which in turn expected /var/run/lock to be present.
  It was indeed present, but a symlink to /run/lock. But that did not
  exist. So LVM failed and so /etc/crypttab was not copied in the
  initramfs.

  I pulled my hair out for 8 hours to find that out. As a note to that
  poor person being in trouble next time: When trying to fix and
  luksOpening the crypto volume, name it exactly as it's written in
  /etc/crypttab. Because the cryptroot hook from initramfs-tools expects
  the LUKS device to be named exactly as /etc/crypttab indicates. That
  took with a couple of hours to figure out.

  Anyway, I expected update-initramfs to fail loudly if it couldn't set
  up the initramfs properly to decrypt my container.

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