[Nix-dev] How to add file to initrd?

[Tomasz Czyż]

2015-09-11 19:03 GMT+01:00 Tuomas Tynkkynen <tuomas.tynkkynen at iki.fi>:

> 2015-09-11 15:05 GMT+03:00 Tomasz Czyż <tomasz.czyz at gmail.com>:
> >
>
> >
> > Mhm, that's definitely not cool. I thought it will appear only inside
> initrd
> > image :[
>
> A copy of the initrd is always kept in /nix/store, but also the .drv file
> and
> potentially any generated scripts (for building the initrd) might
> contain the key.
>
> > Do you think is there any other way to put this key in initrd?
>
> GRUB supports loading multiple initrd images at once. For example,
> on Arch Linux the generated grub.cfg contains this:
>
> menuentry 'Arch Linux' --class arch --class gnu-linux /* etc. */ {
>     # ...
>     initrd /boot/intel-ucode.img /boot/initramfs-linux.img
> }
>
> So one approach would be to create a initrd with just the keyfile
> (outside Nix), place it on the /boot partition, and then somehow
> make the grub.cfg generator emit the proper initrd line(s).
>
wow, I was not aware that stuff is even possible. I have to read more about
how to access stuff from the other initrd.

Btw, I search through /nix/store and the key copied with "echp ${key} >
/key" is not there, so probably it's only inside a script, which is still
bad.

Thanks a lot.
Tom
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