Draft: Add capability to open existing LUKS volumes

Pascal Hambourgrequested to merge
pham/partman-crypto:pham/open-luks-v2 into master

See merged bugs #451535, #498199, #529343, #566497, #641264 #660191, #907955 for use cases.

Main features:

  • detect and show LUKS header as a filesystem
  • re-use the partition settings "format/keep" choice and flag from partman-basicmethods
  • fix interaction with partman-lvm for nested LVM-over-LUKS and LUKS-over-LVM

It still needs some polishing, but works for me. I tested it in the following scenario:

  1. guided partitioning using encrypted LVM -> no regression observed
  2. manual partitioning and open the previously created encrypted volume -> encrypted volume opened and locked, LVs activated and PV locked, crypttab written as expected

Missing bits:

  • ask passphrase again if opening fails
  • integration with OPAL ?

Note: The above bugs contain a patch implementing this feature in a different way by @cjwatson but it seems it was never applied.

Edited by Pascal Hambourg

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