Chris Marusich <cmmarus...@gmail.com> wrote: > I'm not sure. On your non-Guix setup, the crypttab exists in the > initrd, right? And that initrd exists in the /boot directory on the > external drive, right?
Yes. Specifically, I am using dracut to generate the initrd and I believe it is the crypt module that copies crypttab into the cpio. Similary, dracut.conf ensures the initrd also contains the luks header file. > Have you looked into how you can customize the initrd in Guix? Beautiful. That URL you shared gives me a good starting place. Thank you. > If you figure out a configuration that works, please do share it! I sure will! Thank you for taking the time to share your thoughts. > elaexuo...@wilsonb.com writes: > > > Anyway, is there a straightforward way to configure a mapping device for > > LUKS > > with a detached header? Otherwise, what's the best way to go about passing > > command line options to the initrd cryptsetup call? > > > > For a little context, I like my drive to look just like random data to a > > third > > party; however, the precence of a LUKS header pretty much defeats plausible > > deniability of hosting encrypted data. Thus, detached headers. > > > > To that end, with my current non-guix setup, I have /boot and grub sitting > > on > > an external drive, with dracut shoving the LUKS header in the initrd. Then > > crypttab references said header, so the initrd cryptsetup call Just Works > > TM. > > I'm not sure. On your non-Guix setup, the crypttab exists in the > initrd, right? And that initrd exists in the /boot directory on the > external drive, right? > > Have you looked into how you can customize the initrd in Guix? It's > described in the "Initial RAM Disk" section of the manual: > > https://guix.gnu.org/manual/en/html_node/Initial-RAM-Disk.html#Initial-RAM-Disk > > If I understand your non-Guix configuration right, it sounds like you > put the initrd on the external drive. Guix normally installs the initrd > into the store, and then adds to the Grub configuration file a reference > to the initrd in the store, like this: > > menuentry "GNU with Linux-Libre 5.1.2 (#1, 2019-09-13 22:12)" { > search --label --set root > linux /gnu/store/mmnl20fg05w8gzzsp4d8dvagmdn1vjil-linux-libre-5.1.2/bzImage > --root=root --system=/var/guix/profiles/system-1-link > --load=/var/guix/profiles/system-1-link/boot quiet > initrd /gnu/store/af8h57i9h77r5q9djvviyy4s2gfbnwq8-raw-initrd/initrd.cpio.gz > } > > So, it might be a little tricky to convince Guix to do the right thing > for your use case. Also, I think Grub has the ability to read LUKS > volumes, but I'm not sure how to configure it. > > If you figure out a configuration that works, please do share it! > Hopefully something in my email is helpful to you. > > -- > Chris
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