[arch-projects] [mkinitcpio] systemd in initramfs

Tom Gundersen teg at jklm.no
Sat Aug 17 20:48:44 EDT 2013

Hi Thomas,

Thanks for your work on all this, I was hoping someone would pick this up.

On Sun, Aug 18, 2013 at 12:45 AM, Thomas Bächler <thomas at archlinux.org> wrote:
> Am 17.08.2013 17:08, schrieb Thomas Bächler:
>> 3) encrypt: I created the sd-encrypt hook, you can find it here:
>> https://paste.xinu.at/8xUYPI/. This changes the command line syntax, the
>> new syntax can be found in the manpage for systemd-cryptsetup-generator.
>> However, the syntax is less powerful than before - for that reason, I
>> added /etc/crypttab.initrd as /etc/crypttab to the initrd, which should
>> support almost everything. There were some problems with adding the same
>> crypttab for initrd and the main system, but that may be my stupiditiy -
>> I hope the separate crypttab is something we can get rid of.
> Okay, this one has the wrong help, but otherwise it's what I'm going to
> use now: https://paste.xinu.at/0PXjlV/
> It now adds /etc/crypttab to initramfs. You can make sure that only the
> necessary devices are activated in initramfs by using the rd.luks.uuid=
> options on the command line. You can also use rd.luks.uuid= without any
> crypttab entries, but then you can't set extra options (for me:
> allow_discards).

We should make it possible to do this without having to put
/etc/crypttab in the initramfs.

I guess we basically want to mimic what the fstab generator does: 1)
allow options to be specified on the kernel commandline and,
optionally, 2) allow further options to be read from
/sysroot/etc/cryttab once that has been mounted.

For the first, we would need to extend the syntax, perhaps to
{rd.,}luks.uuid.options= or something like that. The second could
obviously not be used for partitions used to mount the rootfs (but
only /usr), so maybe not that useful, but I guess it makes sense to be

What do you think?


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