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Problems with an encrypted root partition and genkernel
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GOS
Tux's lil' helper
Tux's lil' helper


Joined: 09 Sep 2010
Posts: 93
Location: Germany

PostPosted: Sun Feb 11, 2018 4:44 pm    Post subject: Problems with an encrypted root partition and genkernel Reply with quote

Hello,

on my laptop, I use the following hdd-setup:

Code:
sda1 = efi-partition
sda2 = boot-partition
sda3 = luks-partition


On the luks-partition resides the lvm-volume-group vg0. vg0 is divided into swap and root

I made an initramfs via genkernel with "genkernel --luks --lvm --symlink initramfs". (Tried this also with genkernel-next)

Now, grub calls

Code:
set root=hd0,2
linux /boot/KernelImage
initrd /boot/initramfs
crypt_root=/dev/sda3 dolvm root=/dev/mapper/vg0-root


The result (and the problem) is that the initramfs does not ask for a password:

Code:

>> Loading modules

blabla

   :: Loading from crypto:
   :: Loading from virtio:
>> Initializing root device...
!! Could not find the root block device in .
!! Please specify another value or:

blabla


What I am doing wrong?

PS: Without the luks-thing the whole efi-thing and my kernel works well.
PPS: If I go into generkel's shell, the cryptsetup luksOpen /dev/sdb3 luks-dev seems to work
PPPS: Also with UUID's there is no success
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GOS
Tux's lil' helper
Tux's lil' helper


Joined: 09 Sep 2010
Posts: 93
Location: Germany

PostPosted: Sat Feb 17, 2018 10:00 pm    Post subject: Reply with quote

Weather genkernel nor dracut works for me.

Now, I use a custom initramfs which does the trick. The following script creates the initramfs:

Code:

#!/bin/bash

#----------------------------------------------------------------------
# Generate neccessary directories and copy necessary files
#----------------------------------------------------------------------

mkdir -p /var/tmp/BuildInitramfs/{bin,dev,etc/lvm,lib,lib64,mnt/root,proc,root,run/blkid,run/lock/lvm,run/lvm,run/cryptsetup,sbin,sys,usr}
cp /bin/busybox /var/tmp/BuildInitramfs/bin
cp /sbin/lvm.static /var/tmp/BuildInitramfs/sbin
cp /sbin/cryptsetup /var/tmp/BuildInitramfs/sbin


#---------------------------
# Generate etc/lvm/lvm.conf
#---------------------------

cat << EOF > /var/tmp/BuildInitramfs/etc/lvm/lvm.conf
global {
   use_lvmetad = 0
}

activation {
   udev_sync = 0
   udev_rules = 0
}

devices {
   issue_discards = 1
}

EOF


#--------------------------
# Generate the init-script
#--------------------------

cat << EOF > /var/tmp/BuildInitramfs/init
#!/bin/busybox sh

# Define the rescue_shell
rescue_shell(){
   echo "Es gab Funktionsprobleme. Oeffne die Notfall Shell."
   busybox --install -s
   exec /bin/sh
}


# Mount /dev, /proc and /sys filesystems
mount -t devtmpfs none /dev
mount -t proc none /proc
mount -t sysfs none /sys

# Deactivate useless kernel messages
echo 0 > /proc/sys/kernel/printk

# Decrypt the drive
echo ""
echo "======================"
echo " Decrypt HDD for boot"
echo "======================"
echo ""
cryptsetup --allow-discards luksOpen /dev/sdb3 CryptoDev1
wait

# Activate the lvm volume group
lvm.static vgscan --mknodes
lvm.static lvchange -a ly CryptoVg1/root
lvm.static vgscan --mknodes
wait

# Mount the root-partition
mount -o ro /dev/mapper/CryptoVg1-root /mnt/root || rescue_shell
wait

# Clean up
echo 1 > /proc/sys/kernel/printk
mount --move /proc /mnt/root/proc
mount --move /sys /mnt/root/sys
mount --move /dev /mnt/root/dev
wait

# Switcheroo
exec switch_root /mnt/root /sbin/init

EOF

chmod a+rx /var/tmp/BuildInitramfs/init


#-----------------------
# Build the Initramfs
#-----------------------

cd /var/tmp/BuildInitramfs
find . -print0 | cpio --null -ov --format=newc | gzip -9 > /boot/Initramfs.cpio.gz
cd /

#--------------------------------
# Delete temporary files
#--------------------------------

rm -rf /var/tmp/BuildInitramfs

exit
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