Mount loop device right after boot.

[iX9]

Is some-how possible do this, just after boot?

losetup /dev/loop0 /X

Need to solve this situation:
I need to have all linux parts just on the one partition (/dev/sda1, ext4) - AND - to have fully encrypted system.

Normally, there must be other (unencrypted) partition for /boot.
Maybe I found the way?

I have /boot on this partition and the rest of the system - in LUKS encrypted file-container placed as file in the root of the same partition.

Only one thing I cant solve - how to tell to the core, to "make device" from file by losetup.
It must be done after boot, but before the cryptsetup asks for password.

[Lars Noodén]

You can put things in /etc/rc.local and they will run at startup just after all the SystemV scripts have run.

[iX9]

I dont thing so, I cant put it to /etc/rc.local, because this file is encrypted in the file container with rest of the system.
First it must be unlocked, then it can be readed.
But for unlocking, I need "make file as device" first - it does that losetup command.
Or am I wrong?

[iX9]

Maybe do some magic with initramfs?
There is directory /etc/initramfs-tools/scripts/premount...
"Premount" - maybe it mean run something before mount root filesystem?