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8a60930c6b
Not all distro put crypttab under /etc/ within initramfs, but finding it at
runtime needs unpacking, which may be hard to do, so it is made overridable
with a file at /boot/kexec_initrd_crypttab_path.txt, whose content could be
obtained with $ cpio -t < ${uncompressed_initrd} | grep crypttab .
The "target" field of the record within the crypttab stored in the root
file system for the luks container which is going to be unlocked via
kexec-insert-key should be modified into the same "luks-$uuid" format,
otherwise the boot sequence will get stuck when OS is trying to unlock them
again, in order to map them according to "target" fields written in the
crypttab stored in the root fs.