[RFC] Add support for LUKS encrypted root in rescue mode

Hi!

Attached is a patch that will allow encrypted (using LUKS) root partitions to be used in rescue mode.

The patch is fairly simple, and ask a passphrase for every LUKS partitions found before the root partition is choosen.

This only affects rescue-mode.postinst, add a template and a dependency on crypto-modules and cryptsetup-udeb.

In the long term, it is not probably the best solution as it does neither support loop-aes partitions, nor plain dm-crypt. It would probably better to support re-use of already encrypted partitions in partman and use these facilities in rescue-mode instead of custom code.

Anyway, it works nicely with the guided partitioning for crypto root, and that actually covers quite a lot of our users, so it might still be a worthy addition.

Cheers,

-- 
Jérémy Bobbio                        .''`. 
lunar@debian.org                    : :Ⓐ  :  # apt-get install anarchism
                                    `. `'` 
                                      `-   

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