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r1k0 / kigen

a decent Python3 Kernel|Initramfs generator for Portage (Gentoo/Funtoo/Sabayon/Exherbo/VidaLinux/Calculate)
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======= General

.. sectnum::

.. contents:: Table of contents

Introduction


**KIGen now only supports Python3.**

**KIGen uses Genkernel linuxrc and provides the same boot interface as Genkernel does.**

KIGen for Linux aims at providing first an equal set of features (in Python)
as Genkernel does for Gentoo as well as a python interface to sys-boot/boot-update for Funtoo.
Genkernel being a bash script, interfacing it with boot-update is 'tricky' if not insane.

KIGen tries to provide a flexible approach to shipping binaries in an initramfs. In theory,
one can ship any binary, statically or dynamically linked. If it's linked the appropriated 
libraries need to be shipped as well. 
KIGen tries to provide a host and source binary for each feature in case one breaks. This way
one can use Portage binaries or the sources from KIGen. It does not matter as long as it works.
KIGen attempts to detect and ship dynamically linked binaries. It can identify linked binaries
and ship it to the initramfs. It does not matter as long as it works ;P

KIGen provides a more visible configuration set of files than genkernel in terms of kernel modules,
custom source URLs and source versions.
KIGen will automagically detect if you are running boot-update (we support Gentoo and
Sabayon too) then read your /etc/boot.conf and overwrite your /etc/kigen.conf
configuration in terms of kernel modules only.

Features

Supported OS


KIGen supports Portage and works on the following linux based flavors:

- Funtoo  and its boot-update interface,
- Gentoo  (no boot-update interface),
- Sabayon (no boot-update interface),

Portage and Funtoo boot-update support

In Funtoo, sys-boot/boot-update is now responsible for managing a unified boot configuration file known as /etc/boot.conf. It ships all kernel/initramfs boot information and autogenerates /boot/grub/grub.conf or /boot/grub/grub.cfg depending on your GRUB version (in Funtoo, grub-0.97 is known as sys-boot/grub-legacy and grub-1.97 as sys-boot/grub).

KIGen imports colors from Portage itself. It keeps the code simpler. If Portage API cannot be found color are disabled, hence non Portage systems don't and won't have any color support.

KIGen will detect /etc/boot.conf and will append the modules configuration from /etc/kigen.conf with the content of the load-modules variable set in Coreboot.

/etc/boot.conf sample::

initrd { load-modules ext4 }

/etc/kigen.conf sample::

MODULES_FS = ext3

This will result in shipping 'ext3 ext4' as modules in the initramfs if you have them built as modules. You can simply ignore either one or the other or both configuration files.

Non Portage support


KIgen could in theory work on non Portage Linux systems but does not.
It could be a nice enhancement to add support for Debian.
To allow this we would need to get rid of the Portage code dependencies.
Here is the list of source code items that depends on Portage.
::
 - Python3 version depends on 
 pyv = os.popen('eselect python show --python3').read().strip()
 sys.path.append("/usr/lib/"+pyv+"/site-packages/kigen/modules")
 - --splash uses media-gfx/splashutils
 - --evms uses sys-fs/evms
 - /usr/bin/portageq used in modules/utils/misc.py def get_distdir(temp):

Portage systems kernel boot options

KIGen's linuxrc is the same as Genkernel's one except a couple of lines (bug using splash and luks for silent splash). Some GRUB examples of kernel command line boot options (haven't used LiLo for years). ::

Source code notes


KIGen has to make bash calls: no python interface for the kernel Makefile or to compress
a cpio initramfs.

I found no decent python cpio libraries (one is read-only). If you know one that could handle
the job, please mail me to let me know.
Therefore, you shoud understand why I made some choices from the source code point of
view.
As long as we have to make bash calls, we'll have to have to control the return value
of that call. Hence the return 0 logic you can find here and there in KIGen.

**KIGen is on purpose using simple syntax: it's a relaxing project, a smoke some music
and let's geek around, that's the spirit.
It's not rocket science but I do enjoy a lot writing code.** ;P

==============================
Howto build a kernel/initramfs 
==============================

Portage (Gentoo/Sabayon/Funtoo)

Download an ebuild of your choice at http://www.github.com/r1k0/kigen/downloads. If you're not familiar with creating your own overlay, refer to http://www.gentoo.org/proj/en/overlays/userguide.xml. :: z13 ~ # mkdir -p /usr/local/portage/sys-kernel/kigen/ z13 ~ # cd /usr/local/portage/sys-kernel/kigen/ z13 ~ # wget http://github.com/downloads/r1k0/kigen/kigen-9999.ebuild z13 ~ # ebuild kigen-9999.ebuild digest

Optionally set the +doc USE flag or the +module-rebuild one to allow passing 'kigen k --module-rebuild'. :: z13 ~ # echo "sys-kernel/kigen doc module-rebuild" >> /etc/portage/package.use

emerge it. :: z13 ~ # emerge kigen -av

These are the packages that would be merged, in order:

Calculating dependencies ... done! [ebuild N ] sys-kernel/module-rebuild-0.7 0 kB [0] [ebuild N ] sys-kernel/kigen-9999 USE="doc module-rebuild" 0 kB [1]

Total: 2 packages (2 new), Size of downloads: 0 kB Portage tree and overlays: [0] /usr/portage [1] /usr/local/portage

Would you like to merge these packages? [Yes/No]

Verifying ebuild manifests

Starting parallel fetch

Emerging (1 of 2) sys-kernel/module-rebuild-0.7

  • Package: sys-kernel/module-rebuild-0.7
  • Repository: gentoo
  • Maintainer: kernel-misc@gentoo.org
  • USE: amd64 elibc_glibc kernel_linux multilib userland_GNU
  • FEATURES: preserve-libs sandbox Unpacking source... Source unpacked in /var/tmp/portage/sys-kernel/module-rebuild-0.7/work Compiling source in /var/tmp/portage/sys-kernel/module-rebuild-0.7/work ... Source compiled. Test phase [not enabled]: sys-kernel/module-rebuild-0.7

Install module-rebuild-0.7 into /var/tmp/portage/sys-kernel/module-rebuild-0.7/image/ category sys-kernel Completed installing module-rebuild-0.7 into /var/tmp/portage/sys-kernel/module-rebuild-0.7/image/

Installing (1 of 2) sys-kernel/module-rebuild-0.7

  • checking 1 files for package collisions Merging sys-kernel/module-rebuild-0.7 to / --- /usr/ --- /usr/sbin/ /usr/sbin/module-rebuild sys-kernel/module-rebuild-0.7 merged.

Emerging (2 of 2) sys-kernel/kigen-9999 from r1k0

  • Package: sys-kernel/kigen-9999
  • Repository: r1k0
  • USE: amd64 doc elibc_glibc kernel_linux module-rebuild multilib userland_GNU
  • FEATURES: preserve-libs sandbox Unpacking source...
  • GIT update -->
  • repository: git://github.com/r1k0/kigen.git
  • at the commit: 61e647ed54180ef7cb49f3178e3bf9b33e94ec55
  • branch: master
  • storage directory: "/usr/portage/distfiles/git-src/kigen" Cloning into /var/tmp/portage/sys-kernel/kigen-9999/work/kigen-9999... done. Unpacked to /var/tmp/portage/sys-kernel/kigen-9999/work/kigen-9999 Source unpacked in /var/tmp/portage/sys-kernel/kigen-9999/work Preparing source in /var/tmp/portage/sys-kernel/kigen-9999/work/kigen-9999 ... Source prepared. Configuring source in /var/tmp/portage/sys-kernel/kigen-9999/work/kigen-9999 ... Source configured. Compiling source in /var/tmp/portage/sys-kernel/kigen-9999/work/kigen-9999 ... Source compiled. Test phase [not enabled]: sys-kernel/kigen-9999

Install kigen-9999 into /var/tmp/portage/sys-kernel/kigen-9999/image/ category sys-kernel Completed installing kigen-9999 into /var/tmp/portage/sys-kernel/kigen-9999/image/

ecompressdir: bzip2 -9 /usr/share/man

Installing (2 of 2) sys-kernel/kigen-9999

  • checking 77 files for package collisions Merging sys-kernel/kigen-9999 to / --- /usr/ --- /usr/lib/ --- /usr/lib/python3.2/ --- /usr/lib/python3.2/site-packages/ --- /usr/lib/python3.2/site-packages/kigen/ --- /usr/lib/python3.2/site-packages/kigen/modules/ --- /usr/lib/python3.2/site-packages/kigen/modules/initramfs/ --- /usr/lib/python3.2/site-packages/kigen/modules/initramfs/bin/ /usr/lib/python3.2/site-packages/kigen/modules/initramfs/bin/init.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/bin/busybox.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/bin/disklabel.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/bin/dmraid.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/bin/dropbear.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/bin/evms.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/bin/glibc.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/bin/libncurses.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/bin/luks.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/bin/lvm2.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/bin/screen.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/bin/strace.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/bin/zlib.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/dev/ /usr/lib/python3.2/site-packages/kigen/modules/initramfs/dev/init.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/dev/aufs.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/dev/device_mapper.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/dev/fuse.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/dev/gnupg.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/dev/iscsi.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/dev/multipath.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/dev/splash.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/dev/unionfs_fuse.py --- /usr/lib/python3.2/site-packages/kigen/modules/initramfs/sources/ /usr/lib/python3.2/site-packages/kigen/modules/initramfs/sources/init.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/sources/busybox.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/sources/dmraid.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/sources/dropbear.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/sources/e2fsprogs.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/sources/luks.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/sources/lvm2.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/sources/screen.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/sources/strace.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/init.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/append.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/bootupdate.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/compress.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/extract.py /usr/lib/python3.2/site-packages/kigen/modules/initramfs/initramfs.py --- /usr/lib/python3.2/site-packages/kigen/modules/kernel/ /usr/lib/python3.2/site-packages/kigen/modules/kernel/init.py /usr/lib/python3.2/site-packages/kigen/modules/kernel/extract.py /usr/lib/python3.2/site-packages/kigen/modules/kernel/kernel.py --- /usr/lib/python3.2/site-packages/kigen/modules/utils/ /usr/lib/python3.2/site-packages/kigen/modules/utils/init.py /usr/lib/python3.2/site-packages/kigen/modules/utils/fstab.py /usr/lib/python3.2/site-packages/kigen/modules/utils/isstatic.py /usr/lib/python3.2/site-packages/kigen/modules/utils/listdynamiclibs.py /usr/lib/python3.2/site-packages/kigen/modules/utils/misc.py /usr/lib/python3.2/site-packages/kigen/modules/utils/process.py /usr/lib/python3.2/site-packages/kigen/modules/init.py /usr/lib/python3.2/site-packages/kigen/modules/cliparser.py /usr/lib/python3.2/site-packages/kigen/modules/credits.py /usr/lib/python3.2/site-packages/kigen/modules/default.py /usr/lib/python3.2/site-packages/kigen/modules/etcparser.py /usr/lib/python3.2/site-packages/kigen/modules/nocolor.py /usr/lib/python3.2/site-packages/kigen/modules/stdout.py /usr/lib/python3.2/site-packages/kigen/modules/usage.py --- /usr/share/ --- /usr/share/kigen/ /usr/share/kigen/arch/ /usr/share/kigen/arch/x86/ /usr/share/kigen/arch/x86/busybox.config /usr/share/kigen/arch/x86/kernel.config /usr/share/kigen/arch/x86_64/ /usr/share/kigen/arch/x86_64/busybox.config /usr/share/kigen/arch/x86_64/kernel.config /usr/share/kigen/defaults/ /usr/share/kigen/defaults/initrd.defaults /usr/share/kigen/defaults/initrd.scripts /usr/share/kigen/defaults/keymaps.tar.gz /usr/share/kigen/defaults/linuxrc /usr/share/kigen/defaults/modprobe /usr/share/kigen/defaults/udhcpc.scripts /usr/share/kigen/tools/ /usr/share/kigen/tools/ttyecho.c /usr/share/kigen/scripts/ /usr/share/kigen/scripts/boot-luks-lvm.sh /usr/share/kigen/scripts/boot-luks.sh --- /usr/share/man/ --- /usr/share/man/man8/ /usr/share/man/man8/kigen.8.bz2 --- /usr/share/doc/ /usr/share/doc/kigen-9999/ /usr/share/doc/kigen-9999/README.rst.bz2 /usr/share/doc/kigen-9999/TODO.bz2 --- /usr/sbin/ /usr/sbin/kigen --- /etc/ /etc/kigen/ /etc/kigen/initramfs/ /etc/kigen/initramfs/default.conf /etc/kigen/initramfs/modules.conf /etc/kigen/initramfs/url.conf /etc/kigen/initramfs/version.conf /etc/kigen/kernel/ /etc/kigen/kernel/default.conf /etc/kigen/master.conf
  • This is still experimental software, be cautious.
  • Tell me what works and breaks for you by dropping a comment at
  • http://github.com/r1k0/kigen

  • sys-kernel/kigen-9999 merged.

Recording sys-kernel/kigen in "world" favorites file... Auto-cleaning packages...

No outdated packages were found on your system.

Kigen has 3 sets of config files:

They are heavily commented, their options should be self explanatory.

Remember that command line parameters will always overwrite the config files.

Main :: z13 ~ # kigen

a Portage kernel|initramfs generator

Usage: /usr/sbin/kigen <options|target> [parameters]

Options: --help, -h This and examples --nocolor, -n Do not colorize output --version Version --credits Credits and license

Targets: kernel, k Build kernel/modules initramfs, i Build initramfs tool, t Use handy tools

Parameters: kigen kernel --help, -h kigen initramfs --help, -h kigen tool --help, -h z13 ~ #

Help menu. :: z13 ~ # kigen k -h Parameter: Config value: Description:

Kernel: --dotconfig=/file "" Custom kernel .config file --initramfs=/file "" Embed initramfs into the kernel --fixdotconfig= "" Check and auto fix the kernel config file (experimental) --clean False Clean precompiled objects only --mrproper False Clean precompiled objects and remove config file --menuconfig False Interactive kernel options menu --fakeroot=/dir "/" Append modules to /dir/lib/modules --nooldconfig False Do not ask for new kernel/initramfs options --nomodinstall False Do not install modules --nomodules False Do not compile or install modules

Misc: --nosaveconfig False Do not save kernel config in /etc/kernels --noboot False Do not copy kernel to /boot --rename=/file "" Custom kernel file name --logfile=/file "/var/log/kigen.log" --debug, -d False Debug verbose z13 ~ #

Default behavior. :: z13 ~ # kigen k

It is up to you to adapt your /etc/lilo.conf or /boot/grub/grub.cfg file.

Help menu. :: z13 ~ # kigen i -h Parameter: Config value: Description:

Features:

Default behavior. :: z13 ~ # kigen i

Generally, what can be compiled with KIGen should be cacheable. In this case, busybox cache is used. :: z13 ~ # kigen i

Now let's make a full blown initramfs. :: z13 ~ # kigen i --splash=emergence --source-disklabel --source-luks --bin-lvm2 --source-dropbear --debugflag --rootpasswd=mypasswd --keymaps=all --source-ttyecho --source-strace --source-screen --bin-glibc --bin-zlib --bin-libncurses --defconfig --nocache

Typically this adds support for splash/luks/lvm2/dropbear to the initramfs. Note that by default kigen will will fetch the sources and link statically. Passing --bin-all --dynlibs will use host binaries when possible.

It is up to you to adapt your /etc/lilo.conf or /boot/grub/grub.cfg file.

KIGen has a toolbox. It is provided for convenience (read lazyness). It lets you extract a .config file from a kernel. :: z13 ~ # kigen tool Parameter: Config value: Description:

Kernel: --getdotconfig=/vmlinux "" Extract .config from compiled binary kernel (if IKCONFIG has been set)

Initramfs: --extract=/file "" Extract initramfs file --to=/dir "/var/tmp/kigen/extracted-initramfs" Custom extracting directory --compress=/dir "" Compress directory into initramfs --into=/file "/var/tmp/kigen/compressed-initramfs/initramfs_data.cpio.gz" Custom initramfs file

Misc: --rmcache False Remove cached data z13 ~ # mount /boot z13 ~ # kigen tool --getdotconfig=/boot/kernel-kigen-x86_64-2.6.38-gentoo-r5

You can easily extract an initramfs for troubleshooting or the sake of customization. :: z13 ~ # kigen t --extract=/boot/initramfs-kigen-x86_64-2.6.38-gentoo-r5

You can actually create your own initramfs environment and litterally compress it. You can then do some tweaking and then close again the initramfs. :: z13 ~ # kigen t --compress=/var/tmp/kigen/extracted-initramfs

APT (Debian/Ubuntu)


TODO?

==========================================
Howto boot LUKS/LVM through SSH (dropbear)
==========================================

Warning: this only works with ethernet devices.
TODO: wlan devices.

Build initramfs with SSH support

Make sure libraries are called. :: z13 ~ # kigen i --splash=emergence --source-disklabel --source-luks --bin-lvm2 --source-dropbear --debugflag --rootpasswd=mypasswd --keymaps=all --source-ttyecho --source-strace --source-screen --bin-glibc --bin-zlib --bin-libncurses --defconfig

Set kernel command option


To boot in SSH mode, pass the 'dropbear' option in the kernel command line.
Edit /boot/grub/grub.cfg to have the kernel command line look like.
::
  linux /kernel-kigen-x86_64-2.6.37-gentoo ro single init=/linuxrc splash=verbose,theme:sabayon vga=791 console=tty1 quiet resume=swap:/dev/mapper/vg_hogbarn-swap real_resume=/dev/mapper/vg_hogbarn-swap dolvm root=/dev/ram0 ramdisk=8192 real_root=/dev/mapper/vg_hogbarn-lv_root crypt_root=/dev/sda2 docrypt dokeymap keymap=be dropbear ip=dhcp

Kill dropbear daemon and restart openssh (DEPRECATED)

The linuxrc should kill dropbear automagically.

Make sure existing connections with initramfs are killed and openssh binds to :22 correctly. Add on the following to /etc/conf.d/local. :: pkill dropbear sleep 1 /etc/init.d/sshd restart

Connect to initramfs and boot remotely



ssh to initramfs (you might have to remove the previous certificate in .ssh/known_hosts).
::
  z13 ~ # ssh 192.168.1.70
  The authenticity of host '192.168.1.70 (192.168.1.70)' can't be established.
  RSA key fingerprint is 7b:12:41:2a:fc:18:1c:23:81:b5:02:6e:a9:8e:c3:70.
  Are you sure you want to continue connecting (yes/no)? yes
  Warning: Permanently added '192.168.1.70' (RSA) to the list of known hosts.
  root@192.168.1.70's password: 

  BusyBox v1.18.4 (2011-06-17 21:10:46 CEST) built-in shell (ash)
  Enter 'help' for a list of built-in commands.

  # uname -a
  Linux (none) 2.6.39-sabayon #3 SMP Wed Jun 15 17:51:49 CEST 2011 i686 GNU/Linux
  # ls -l /
  drwxr-xr-x    2 root     root             0 Jun 17 23:07 bin
  drwxr-xr-x    4 root     root         13380 Jun 17 23:07 dev
  drwxr-xr-x    7 root     root             0 Jun 17 23:07 etc
  drwxr-xr-x    2 root     root             0 Jun 17 23:02 home
  -rwxr-xr-x    1 root     root         18642 Jun 17 23:02 init
  drwxr-xr-x    6 root     root             0 Jun 17 23:02 lib
  lrwxrwxrwx    1 root     root             3 Jun 17 23:02 lib64 -> lib
  -rw-r--r--    1 root     root           214 Jun 17 23:07 modules.cache
  dr-xr-xr-x   72 root     root             0 Jun 17 23:06 proc
  drwxr-xr-x    2 root     root             0 Jun 17 23:02 root
  drwxr-xr-x    2 root     root             0 Jun 17 23:07 sbin
  drwxr-xr-x   12 root     root             0 Jun 17 23:07 sys
  drwxr-xr-x    2 root     root             0 Jun 17 23:02 tmp
  drwxr-xr-x    6 root     root             0 Jun 17 23:02 usr
  drwxr-xr-x    5 root     root             0 Jun 17 23:02 var
  # ip a
  1: lo: <LOOPBACK> mtu 16436 qdisc noop state DOWN 
      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
      link/ether 08:00:27:50:5e:a3 brd ff:ff:ff:ff:ff:ff
      inet 192.168.1.70/24 brd 192.168.1.255 scope global eth0
  # netstat
  Active Internet connections (w/o servers)
  Proto Recv-Q Send-Q Local Address           Foreign Address         State       
  tcp        0      0 Unknown-08-00-27-50-5e-a3.lan:22 z13.lan:34046           ESTABLISHED 
  Active UNIX domain sockets (w/o servers)
  Proto RefCnt Flags       Type       State         I-Node Path
  # ps
    PID USER       VSZ STAT COMMAND
      1 root      1596 S    /bin/sh /init dokeymap dolvm docrypt dokeymap dodrop
      2 root         0 SW   [kthreadd]
      3 root         0 SW   [ksoftirqd/0]
      4 root         0 SW   [kworker/0:0]
      5 root         0 SW   [kworker/u:0]
      6 root         0 SW   [migration/0]
      7 root         0 SW<  [cpuset]
      8 root         0 SW<  [khelper]
      9 root         0 SW   [kworker/u:1]
     31 root         0 SW<  [netns]
    493 root         0 SW   [sync_supers]
    495 root         0 SW   [bdi-default]
    496 root         0 SW<  [kintegrityd]
    498 root         0 SW<  [kblockd]
    570 root         0 SW<  [ata_sff]
    582 root         0 SW   [khubd]
    589 root         0 SW<  [md]
    691 root         0 SW   [kworker/0:1]
    711 root         0 SW   [kswapd0]
    712 root         0 SWN  [ksmd]
    781 root         0 SWN  [khugepaged]
    782 root         0 SW   [fsnotify_mark]
    793 root         0 SW   [ecryptfs-kthrea]
    814 root         0 SW<  [crypto]
    826 root         0 SW<  [kthrotld]
   1425 root         0 SW   [cciss_scan]
   1450 root         0 SW<  [iscsi_eh]
   1457 root         0 SW<  [fc_exch_workque]
   1458 root         0 SW<  [fc_rport_eq]
   1461 root         0 SW<  [fnic_event_wq]
   1545 root         0 SW   [scsi_eh_2]
   1548 root         0 SW   [kworker/u:2]
   1563 root         0 SW   [scsi_eh_3]
   1566 root         0 SW   [scsi_eh_4]
   1569 root         0 SW   [kworker/u:3]
   1570 root         0 SW   [kworker/u:4]
   1636 root         0 SW<  [cnic_wq]
   1640 root         0 SW<  [exec-osm]
   1647 root         0 SW<  [block-osm]
   1687 root         0 RW   [kworker/0:2]
   1692 root         0 SW<  [kpsmoused]
   1707 root         0 SW<  [edac-poller]
   1753 root         0 SW   [kworker/u:5]
   4190 root         0 SW   [jfsIO]
   4191 root         0 SW   [jfsCommit]
   4192 root         0 SW   [jfsSync]
   4273 root         0 SW<  [rpciod]
   4375 root         0 SW<  [xfs_mru_cache]
   4376 root         0 SW<  [xfslogd]
   4377 root         0 SW<  [xfsdatad]
   4378 root         0 SW<  [xfsconvertd]
   5066 root      1596 S    udhcpc
   5067 root      1224 S    dropbear -E
   5073 root      1460 S <  cryptsetup luksOpen /dev/sda2 root
   5074 root      4036 S    dropbear -E
   5075 root      1600 S    -sh
   5080 root      4264 R    ps
  # ls
  boot-luks-lvm.sh  boot-luks.sh
  # cat boot-luks-lvm.sh
  #!/bin/sh
  if  [ "$1" = "-h" ]     || \
      [ "$1" = "--help" ] || \
      [ "$1" = "" ]       || \
      [ "$2" = "" ]
  then
      echo "$0 <root device> <lvm root device>"
      echo "i.e. # ./boot-luks-lvm.sh /dev/sda2 /dev/mapper/vg_sabayon-lv_root"
      exit
  fi
  pkill cryptsetup
  sleep 2
  /sbin/cryptsetup luksOpen $1 root
  sleep 2
  /bin/lvm vgscan
  /bin/lvm vgchange -a y
  /sbin/ttyecho -n /dev/console $2
  # ./boot-luks-lvm.sh
  ./boot-luks-lvm.sh <root device> <lvm root device>
  i.e. # ./boot-luks-lvm.sh /dev/sda2 /dev/mapper/vg_sabayon-lv_root
  # ./boot-luks-lvm.sh /dev/sda2 /dev/mapper/vg_sabayon-lv_root
  Enter passphrase for /dev/sda2: 
    Reading all physical volumes.  This may take a while...
    Found volume group "vg_sabayon" using metadata type lvm2
    2 logical volume(s) in volume group "vg_sabayon" now active
  # Connection to 192.168.1.70 closed by remote host.
  Connection to 192.168.1.70 closed.
  z13 ~ # 

The initramfs is now booting from the content of the LUKS container remotely! Yiha
Note the autodeconnection done by the host.

:Authors: 
    erick 'r1k0' michau (python engine),

    Portage community (linuxrc scripts),