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| 6 Apr 2024 |
 steveej | i'm working on a nixos config for a cloud-hypervisor based hosting platform. they load the kernel and initram directly without a bootloader. they hardcode calling /init. now i'm looking for a way to replace the /init. i've accepted the fact that i won't be able to do fallback for now. what is the right place in a config to execute this? i'm thinking of boot.loader.external.installHook but don't fully understand the context it runs in | 09:41:28 |
| steveej | * i'm working on a nixos config for a cloud-hypervisor based hosting platform. they load the kernel and initram directly without a bootloader. they hardcode calling /init. now i'm looking for a way to replace the /init on nixos-rebuild switch or boot. i've accepted the fact that i won't be able to do fallback for now. what is the right place in a config to execute this? i'm thinking of boot.loader.external.installHook but don't fully understand the context it runs in | 09:42:04 |
 K900 | What we've done in NixOS-WSL is use an activation script to inject a binary there | 09:43:43 |
| K900 | That looks something like this: https://github.com/nix-community/NixOS-WSL/blob/main/utils/src/shim.rs | 09:44:21 |
| K900 | You probably want to do something similar | 09:44:27 |
| K900 | (or even steal that one wholesale as I'm pretty sure it doesn't have any WSL specific hacks left) | 09:44:39 |
| steveej | i thought about an activation that too. does that work in the nixos-rebuild boot case? i thought it's only executed when the new system is booted, which in my case relies on /init pointing to the new system | 09:47:41 |
| K900 | It doesn't, no | 09:48:33 |
| K900 | The more correct way to do it would be through a bootloader script, yes | 09:48:43 |
| K900 | But the important thing here is that you can't just symlink NixOS init to the right place and expect it to work | 09:49:01 |
| K900 | Because normally activation happens before that | 09:49:06 |
| K900 | So you have to have your own thing that will run the activation script and then run the stage2 init | 09:49:24 |
| steveej | FWIW, this works imperatively on the system:
set -xeEu -o pipefail
result="$(nix build --refresh --tarball-ttl 0 github:holochain/holochain-infra/workorch-zos#nixosConfigurations.tfgrid-devnet-vm0.config.system.build.toplevel --print-out-paths --no-link)"
ln -sf "${result}"/init /init
| 09:49:30 |
| steveej | i'd be ok putting this anywhere appropriate. but i want to prevent running it anywhere else other than on the actual target system, for probably obvious reasons 😆 | 09:50:47 |
| steveej | this is just the update use-case. i've already got something for the initial system assembly | 09:51:07 |
| steveej | i'm looking through the shim code you've sent me and am intimidated by wrangling with /dev entries :-) is this used as a PID1 shim? | 09:53:34 |
| steveej | either i'm oversimplifying or my use-case is actually simpler than in WSL | 09:54:17 |
| K900 | The /dev stuff can be ignored | 09:55:47 |
| K900 | It's a workaround for a stupid WSL bug | 09:55:50 |
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| steveej | this works (obviously it's not a noop anymore)
boot.loader.external.installHook = pkgs.writeShellScript "noop" ''
${pkgs.coreutils}/bin/ln -sf "$1"/init /init
'';
| 10:37:57 |
 adamcstephens | The lxc container does something similar | 11:29:02 |
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