[Nix-dev] Prepending files to initrd

[Roger Qiu]

Hi,

There's an option called: `boot.initrd.prepend`. I tried to prepend a 
gzipped cpio archive containing 1 single file with no path. But I upon 
rebooting, I received a `Initramfs unpacking failed: junk in compressed 
archive`.

Here was the steps I took:

```
pushd /boot
cpio -o <<< "luks-key.img" >luks-key.cpio
gzip luks-key.cpio
rm luks-key.img
popd
```

Then inside `configuration.nix`: `boot.initrd.prepend = [ 
"/boot/luks-key.cpio.gz" ];`.

I expect the file `luks-key.img` to be available in the initrd at stage 
1. I want to be able to reference this as `/luks-key.img`.

Is there anything I'm doing incorrect here?

Thanks,
Roger

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