[Bug 1086612] Re: plymouth isn't working in lxc containers

[Steve Langasek]

Looks like this is caused by the lack of any plymouth themes in the
default lxc environment.  Installing the plymouth-theme-ubuntu-text
package, the following works:

# service tty2 stop
tty2 stop/waiting
# plymouthd --mode=boot --attach-to-session --tty=/dev/tty2
# plymouth show-splash
#

connecting to tty2 with 'lxc-console -n p1 -t 2' shows me the expected
text splash screen.

# plymouth ask-for-password --prompt 'open sesame: '
#

the prompt is shown.

So either lxc should mask the 'splash' argument in /proc/cmdline by
default, or plymouth-theme-ubuntu-text should be included.

The other problem is that by default, plymouth in Ubuntu looks to
/dev/tty7, which isn't mapped anywhere usable under lxc.  This could
also be forced by forcing an alternate kernel commandline, such as
'console=/dev/lxc/console'.

If /proc/cmdline itself isn't virtualized, I'd be ok with a patch to
/etc/init/plymouth.conf to pass an appropriate --kernel-command-line
argument when in a container, provided it can be done in the same way as
/etc/init/container-detect.conf using env vars.  (AIUI, there may be a
LIBVIRT_LXC_CMDLINE variable for this?)

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https://bugs.launchpad.net/bugs/1086612

Title:
  plymouth isn't working in lxc containers

Status in “plymouth” package in Ubuntu:
  New

Bug description:
  root at upstart-test:~# tty 
  /dev/lxc/console
  root at upstart-test:~# start plymouth
  plymouth start/running, process 436
  root at upstart-test:~# start plymouth-splash
  <4>init: console-font main process (439) terminated with status 1
  <4>init: setvtrgb main process (442) terminated with status 1
  plymouth-splash start/running, process 441
  root at upstart-test:~# plymouth ask-for-password --prompt 'open sesame: '
  root at upstart-test:~# ps faux | grep plymouth
  root       445  0.0  0.0   6532   632 lxc/console S+ 00:01   0:00              \_ grep --color=auto plymouth
  root       436  0.0  0.0  34792  1236 ?        S    00:00   0:00 @sbin/plymouthd --mode=boot --attach-to-session
  root at upstart-test:~# stop plymouth
  plymouth stop/waiting

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