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Re: Grub2 plain dm-crypt support

From: Andrei Borzenkov
Subject: Re: Grub2 plain dm-crypt support
Date: Sun, 9 Nov 2014 22:31:50 +0300

В Sun, 09 Nov 2014 11:02:39 +0000
John Lane <address@hidden> пишет:

> On 09/11/14 05:21, Andrei Borzenkov wrote:
> > No, I do not think anything has changed since then. 
> I feared that would be the answer!
> > You could start with git branch mentioned above. 
> I've looked at git. The branch "peter/devmapper" mentioned in the other
> thread is over a year old.

Only the last commit which adds plain dm-crypt support is relevant. And
it is pretty much independent of the rest of grub.

> I presume the relevant that files that implement the "cryptomount"
> command are
>     ./include/grub/cryptodisk.h
>     ./grub-core/disk/cryptodisk.c

No, they implement LUKS support. Commit
adds disk/devmapper.c which implements devmap command.

But the main problem as I see it is to identify disk that is needed.
LUKS is self identifying (you have UUID to find LUKS partition). But
how do you propose to search for partition containing plain dm-crypt?

> I can't see any changes in their git logs that refer to plan dm-crypt.
> Being unfamiliar with the code, I don't really know what I am looking for.
> I'd hoped there would be a specific branch that I could check out and
> build, as building isn't a problem for me. But, if I have to modify code
> to implement it, then that's a step too far.
> > Do you mean - modules implementing crypto routines? I'm afraid, the
> > only documentation is in sources.
> Ok, thanks. I meant generally for all modules but specifically for the
> crypto stuff that I am currently trying to use.
> I have looked through the source but am none the wiser. All I know is
> there is a "cryptmount" command.

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