[Bug 1441983] [NEW] documentation remote unlocking inaccurate

[Muelli]

Public bug reported:

The documentation in /usr/share/doc/cryptsetup/README.remote.gz write
smth along these lines:

To unlock from remote, you could do something like this:

ssh -o "UserKnownHostsFile=~/.ssh/known_hosts.initramfs" \
    -i "~/id_rsa.initramfs" root at initramfshost.example.com \
    "echo -ne \"secret\" >/lib/cryptsetup/passfifo"


However, due to plymouth being installed by default (maybe bug 595648)
it doesn't respect the fifo we're supposed to be writing to.

Uninstalling plymouth doesn't work:

root at ubuntu:~# apt-get purge plymouth
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 cron : Depends: upstart-job
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
root at ubuntu:~# 


Installing the plymouth-disabler also doesn't help.


What helps is to kill the plymouthd process before writing to the fifo.  However, I can't figure out how to reliably determine the PID of plymouthd.

I expected the documentation to be reasonably accurate.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: cryptsetup 2:1.6.1-1ubuntu7
ProcVersionSignature: Ubuntu 3.19.0-12.12-generic 3.19.3
Uname: Linux 3.19.0-12-generic x86_64
ApportVersion: 2.17-0ubuntu1
Architecture: amd64
CurrentDesktop: GNOME
Date: Thu Apr  9 08:02:27 2015
SourcePackage: cryptsetup
UpgradeStatus: No upgrade log present (probably fresh install)
crypttab:
 # target 	source	key	options
 chinacrypto	UUID=286618e1-09c0-4f5c-9bb9-1cf5f96b2dc6	none luks,retry=1,lvm=chinalvm

** Affects: cryptsetup (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug vivid

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https://bugs.launchpad.net/bugs/1441983

Title:
  documentation remote unlocking inaccurate

Status in cryptsetup package in Ubuntu:
  New

Bug description:
  The documentation in /usr/share/doc/cryptsetup/README.remote.gz write
  smth along these lines:

  To unlock from remote, you could do something like this:

  ssh -o "UserKnownHostsFile=~/.ssh/known_hosts.initramfs" \
      -i "~/id_rsa.initramfs" root at initramfshost.example.com \
      "echo -ne \"secret\" >/lib/cryptsetup/passfifo"


  However, due to plymouth being installed by default (maybe bug 595648)
  it doesn't respect the fifo we're supposed to be writing to.

  Uninstalling plymouth doesn't work:

  root at ubuntu:~# apt-get purge plymouth
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:

  The following packages have unmet dependencies:
   cron : Depends: upstart-job
  E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
  root at ubuntu:~# 

  
  Installing the plymouth-disabler also doesn't help.

  
  What helps is to kill the plymouthd process before writing to the fifo.  However, I can't figure out how to reliably determine the PID of plymouthd.

  I expected the documentation to be reasonably accurate.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: cryptsetup 2:1.6.1-1ubuntu7
  ProcVersionSignature: Ubuntu 3.19.0-12.12-generic 3.19.3
  Uname: Linux 3.19.0-12-generic x86_64
  ApportVersion: 2.17-0ubuntu1
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Thu Apr  9 08:02:27 2015
  SourcePackage: cryptsetup
  UpgradeStatus: No upgrade log present (probably fresh install)
  crypttab:
   # target 	source	key	options
   chinacrypto	UUID=286618e1-09c0-4f5c-9bb9-1cf5f96b2dc6	none luks,retry=1,lvm=chinalvm

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