[Nix-dev] Prepending files to initrd

[Shea Levy]

This may not be the case any more, but in the past at least you had to explicitly specify the newc cpio format (with -H newc) when calling cpio to make initrds.

> On Jan 30, 2016, at 5:26 AM, Roger Qiu <roger.qiu at matrix.ai> wrote:
> 
> 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
> 
> -- 
> Founder of Matrix AI
> https://matrix.ai/
> +61420925975
> 
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