Solved: make-initrd -> error -8 when booting

colemickens · May 18, 2021, 6:47pm

Hi folks,

I have a derivation where I make-initrd (more or less following clever’s not-os’s stage-1):

colemickens/nixpkgs-kubernetes/blob/ed6457de60dfb082e7442eb13feb78a430b739b1/pkgs/kata-initrd/default.nix

{ makeInitrd
, writeScript
, dash
, kata-agent
}:

let
  init = writeScript "kata-agent" ''
    $!${dash}/bin/dash
    exec ${kata-agent}/bin/kata-agent
  '';
in 
makeInitrd {
  name = "initrd-kata";
  contents = [
    { object = init;
      symlink = "/init"; }
  ];
}

And then another temp derivation to test it:

github.com

colemickens/nixpkgs-kubernetes/blob/ed6457de60dfb082e7442eb13feb78a430b739b1/flake.nix#L85-L98


      
          kata-test2 = prev.callPackage (
            { stdenv, writeScript, qemu, kata-kernel, kata-initrd
            , containerd, ... }:
            writeScript "test2.sh" 
              ''
                ${qemu}/bin/qemu-system-x86_64 \
                  -cpu host \
                  -enable-kvm \
                  -m 2048m \
                  -kernel ${kata-kernel}/bzImage \
                  -initrd ${kata-initrd}/initrd \
                  -append "init=/init"
              ''
          ) {};

nix build 'github:colemickens/nixpkgs-kubernetes#pkgs.x86_64-linux.kata-test2' \
  && ./result

The problem is…

everytime my init starts up, I get error -8 from the kernel and it failing to start my init.

Run /init as init process
Failed to execute /init (error -8)
Run /init as init process
Kernel panic - not syncing: Requested init /init failed (error -8).
...

The build machine is x86_64-linux, I’m executing qemu-system-x86_64 so I’m not sure what the issue is. I’ve cracked open the cpio archive and it looks roughly like I’d expect. The init symlink is correct, the store contents look fine, etc.

colemickens · May 18, 2021, 10:04pm

Um, $! is not a shebang (#!)…