Public bug reported:
"plymouth ask-for-password" is unable to read keyboard input when the
console is the Xen PV console device (hvc0).
Since the "cryptroot" script that the "cryptsetup" package installs on
initramfs's uses "plymouth ask-for-password" instead of
/lib/cryptsetup/askpass if plymouth is available, this causes the boot
process to hang at the password prompt when trying to boot with an
encrypted root device that needs the operator to type the password on
the console.
As a very hacky workaround, modifying /usr/share/initramfs-tools/scripts
/local-top/cryptroot to always use /lib/cryptsetup/askpass if
$cryptkeyscript is not set (see attached patch) and then regenerating
the initramfs with "update-initramfs -u" works as expected.
Specifying /lib/cryptsetup/askpass as the "keyscript=" using the kernel
command line ("cryptopts=") and/or /etc/crypttab didn't work for
whatever reason, but I didn't spend a whole lot of time trying to figure
out why.
Some relevant system information:
Ubuntu 14.04 (Trusty) on an amd64 Xen domU
The system was debootstrap'd under Finnix on a VM supplied by
Linode.com.
cryptsetup 2:1.6.1-1ubuntu1 amd64
linux-image-3.13.0-33-generic 3.13.0-33.58 amd64
linux-image-virtual 3.13.0.33.39 amd64
linux-virtual 3.13.0.33.39 amd64
plymouth 0.8.8-0ubuntu17 amd64
kernel command line: root=/dev/mapper/crypt-root console=hvc0 ro
contents of /etc/crypttab:
# <target name> <source device> <key file> <options>
crypt-swap /dev/xvdb /dev/urandom
swap,cipher=aes-xts-plain64,size=256,hash=sha512
crypt-root /dev/xvdc none rootdev,luks
contents of /etc/fstab:
# <source device> <mount point> <fs type> <mount options>
/dev/xvda /boot ext4 defaults
/dev/mapper/crypt-swap none swap defaults
/dev/mapper/crypt-root / ext4 errors=remount-ro
none /proc proc defaults
** Affects: plymouth (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "the very hacky workaround; not suitable for general use"
https://bugs.launchpad.net/bugs/1355617/+attachment/4175134/+files/cryptroot-hacky-workaround.patch
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https://bugs.launchpad.net/bugs/1355617
Title:
"plymouth ask-for-password" unable to read keyboard input on Xen PV
console (hvc0)
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