How to include non-empty /etc/crypttab into initramfs?

[nagmat84]

I have LUKS with an encrypted rootfs and want Dracut to include my /etc/crypttab into the initramfs. How do I do that?

No matter what I do, I always end up with an empty /etc/crypttab in the initramfs. After googling I tried different things, but non of them worked

1. I created /etc/cryttab.initramfs with the same content, because somewhere was written that Dracut uses that file to be copied as /etc/crypttab
   
2. I added an explicit "install" directive to the Dracut config to copy /etc/crypttab to the initramgs indepedent of what any Dracut module does
   
3. Somewhere I read that Dractut does not simply copy the file, but tries to parse it itself and is very picky about unbalanced quotes in /etc/crypttab which may result in an empty file, if Dracut isn't able to parser it

From my own quick inspection of the Dracut module 90crypt, point 3 seems plausible. There are various spots where the scripts of that Dracut module read /etc/crypttab. This might also explain why point 2 does not work: even if the cypttab was included unchanged, it might eventually become overwritten by some other Dracut mechanism.

/etc/crypttab{.initramfs}

[sMueggli]

[nagmat84]

Why what? Why I want to include /etc/crypttab? Because I only want to have a single place where I configure all LUKS settings, like timeouts etc.

[zen_desu]

Are you running dracut in hostonly mode?

The only LUKS info which makes sense to have in the initramfs is the root info, the rest isn't really relevant. The initramfs can mount the root, switch to it, and then systemd can use the crypttab to mount the rest.
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[sMueggli]

[zen_desu]